Update dependency gradle to v8.11.1

Bumps [org.xerial:sqlite-jdbc](https://github.com/xerial/sqlite-jdbc) from 3.45.3.0 to 3.46.0.0.
- [Release notes](https://github.com/xerial/sqlite-jdbc/releases)
- [Changelog](https://github.com/xerial/sqlite-jdbc/blob/master/CHANGELOG)
- [Commits](https://github.com/xerial/sqlite-jdbc/compare/3.45.3.0...3.46.0.0)

---
updated-dependencies:
- dependency-name: org.xerial:sqlite-jdbc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.forgejo/workflows/docker-image.yml

@@ -0,0 +1,47 @@
+name: Publish Docker image
+on:
+  push:
+     branches:
+       - main
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Forgejo Packages
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            git.wbrawner.com/wbrawner/twigs
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+      - name: Set up Docker context
+        run: docker context create builders
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          endpoint: builders
+      - name: Login to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.wbrawner.com
+          username: ${{ github.actor }}
+          password: ${{ secrets.FORGEJO_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.forgejo/workflows/pull-request.yml

@@ -0,0 +1,26 @@
+name: Pull request workflow
+on: pull_request
+
+jobs:
+  test:
+    name: Build and Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: https://git.wbrawner.com/actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - name: Validate Gradle Wrapper
+        uses: https://git.wbrawner.com/gradle/actions/wrapper-validation@v3
+      - name: Build with Gradle
+        uses: https://git.wbrawner.com/gradle/actions/setup-gradle@v3
+        with:
+          arguments: --stacktrace check
+      - name: Publish JUnit Results
+        uses: actions/upload-artifact@v3
+        if: always()
+        with:
+          name: Unit Test Results
+          path: "*/build/test-results/test/*.xml"
+          if-no-files-found: error

.github/workflows/docker-image.yml

@@ -1,9 +1,8 @@
 name: Publish Docker image
 on:
   push:
-    branches: main
-    tags:
-        - '*'
+     branches:
+       - main
 
 jobs:
   push_to_registry:
@@ -11,13 +10,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: |
-            ghcr.io/wbrawner/twigs-server
+            ghcr.io/wbrawner/twigs
           tags: |
             type=schedule
             type=ref,event=branch
@@ -27,30 +26,20 @@ jobs:
             type=semver,pattern={{major}}
             type=sha
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-      - name: Deploy
-        uses: appleboy/ssh-action@master
-        with:
-          host: ${{ secrets.HOST }}
-          username: ${{ secrets.USERNAME }}
-          key: ${{ secrets.KEY }}
-          script: |
-            docker compose pull twigs
-            docker compose up -d --build twigs
-            docker image prune -f

.github/workflows/pull-request.yml

@@ -0,0 +1,31 @@
+name: Pull request workflow
+on: pull_request
+
+permissions:
+  statuses: write
+  checks: write
+
+jobs:
+  test:
+    name: Build and Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v3
+      - name: Build with Gradle
+        uses: gradle/gradle-build-action@v3
+        with:
+          arguments: --stacktrace build
+      - name: Publish JUnit Results
+        uses: dorny/test-reporter@v1
+        if: always()
+        with:
+          name: Unit Tests
+          path: "*/build/test-results/test/*.xml"
+          reporter: java-junit
+          fail-on-error: true

.gitignore

@@ -29,3 +29,5 @@ HELP.md
 .vscode/
 .gradle
 *.sql
+
+twigs.db

COPYING

@@ -0,0 +1,661 @@
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+<https://www.gnu.org/licenses/>.

Dockerfile

@@ -1,4 +1,4 @@
-FROM openjdk:17-jdk as builder
+FROM ibm-semeru-runtimes:open-21-jdk as builder
 MAINTAINER William Brawner <me@wbrawner.com>
 
 RUN groupadd --system --gid 1000 gradle \
@@ -8,10 +8,10 @@ COPY --chown=gradle:gradle . /home/gradle/src
 WORKDIR /home/gradle/src
 RUN /home/gradle/src/gradlew --console=plain --no-daemon shadowJar
 
-FROM openjdk:17-slim
+FROM ibm-semeru-runtimes:open-21-jre
 EXPOSE 8080
 RUN groupadd --system --gid 1000 twigs \
     && useradd --system --gid twigs --uid 1000 --create-home twigs
 COPY --from=builder --chown=twigs:twigs /home/gradle/src/app/build/libs/twigs.jar twigs.jar
 USER twigs
-CMD /usr/local/openjdk-17/bin/java $JVM_ARGS -jar /twigs.jar
+CMD /opt/java/openjdk/bin/java $JVM_ARGS -jar /twigs.jar

LICENSE

@@ -1,8 +1,661 @@
-Copyright 2019 William Patrick Brawner
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
 
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+                            Preamble
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
 
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
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+
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+
+  12. No Surrender of Others' Freedom.
+
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+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
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+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
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+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
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+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
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+to attach them to the start of each source file to most effectively
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+
+    <one line to give the program's name and a brief idea of what it does.>
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+    it under the terms of the GNU Affero General Public License as published by
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+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+
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+
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+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -1,16 +1,20 @@
-# Twigs Server
+# Twigs
 
-This is the backend application that powers the [Android](../../../twigs-android), [iOS](../../../twigs-ios), and [web](../../../twigs-web) applications for Twigs, a personal finance/budgeting app. None of these apps are complete, so expect bugs, and they are all in various stages of development, so expect some feature disparity between platforms.
+Twigs is a personal finance application tailored to individuals and small groups that want robust budgeting features
+without needing to pay a monthly subscription.
 
 ## Prerequisites
 
-- JDK 14 or newer
+- JDK 17 or newer
 - PostgreSQL 13 or newer
 - (optional) Docker
 
 ## Running
 
-Prior to running the app, make sure you have a PostgreSQL server running, with a database and user ready to go. To avoid the hassle of figuring out how to get it installed locally, using Docker is recommended, and a sample `docker-compose.yml` file is included in the root of the repository. If you already have a PostgreSQL server running, you can run the app from the command line with gradle:
+Prior to running the app, make sure you have a PostgreSQL server running, with a database and user ready to go. To avoid
+the hassle of figuring out how to get it installed locally, using Docker is recommended, and a
+sample `docker-compose.yml` file is included in the root of the repository. If you already have a PostgreSQL server
+running, you can run the app from the command line with gradle:
 
     ./gradlew run
 
@@ -18,15 +22,20 @@ Prior to running the app, make sure you have a PostgreSQL server running, with a
 
 Some parameters of Twigs can be configured via environment variables:
 
-Environment Variable|Default Value|Note
-:---:|:---:|:---
-`TWIGS_PORT`|`8080`|Port for web server to listen on
-`TWIGS_DB_HOST`|`localhost`|PostgreSQL server host
-`TWIGS_DB_PORT`|`5432`|PostgreSQL server port
-`TWIGS_DB_NAME`|`twigs`|PostgreSQL database name
-`TWIGS_DB_USER`|`twigs`|PostgreSQL database user
-`TWIGS_DB_PASS`|`twigs`|PostgreSQL database password
-`TWIGS_PW_SALT`||Salt to use for password, generated if empty or null
+| Environment Variable | Default Value | Note                                                    |
+|:--------------------:|:-------------:|:--------------------------------------------------------|
+|     `TWIGS_PORT`     |    `8080`     | Port for web server to listen on                        |
+|   `TWIGS_DB_HOST`    |  `localhost`  | PostgreSQL server host                                  |
+|   `TWIGS_DB_PORT`    |    `5432`     | PostgreSQL server port                                  |
+|   `TWIGS_DB_NAME`    |    `twigs`    | PostgreSQL database name                                |
+|   `TWIGS_DB_USER`    |    `twigs`    | PostgreSQL database user                                |
+|   `TWIGS_DB_PASS`    |    `twigs`    | PostgreSQL database password                            |
+|   `TWIGS_PW_SALT`    |               | Salt to use for password, generated if empty or null    |
+|  `TWIGS_SMTP_FROM`   |               | From email address for automated emails sent from Twigs |
+|  `TWIGS_SMTP_HOST`   |               | SMTP server host for sending emails                     |
+|  `TWIGS_SMTP_PORT`   |               | SMTP server port for sending emails                     |     
+|  `TWIGS_SMTP_USER`   |               | SMTP server username for sending emails                 |
+|  `TWIGS_SMTP_PASS`   |               | SMTP server password for sending emails                 |
 
 ## Building
 
@@ -34,3 +43,12 @@ Building the app is also handled with gradle:
 
     ./gradlew shadowJar
 
+## License
+
+Copyright (C) 2019-2024 William Brawner
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.

api/build.gradle.kts

@@ -1,20 +1,16 @@
 plugins {
     kotlin("jvm")
-    kotlin("plugin.serialization") version "1.5.20"
     `java-library`
 }
 
-val ktorVersion: String by rootProject.extra
-
 dependencies {
     implementation(kotlin("stdlib"))
     api(project(":core"))
+    implementation(project(":service"))
     implementation(project(":storage"))
-    api("io.ktor:ktor-server-core:$ktorVersion")
-    api("io.ktor:ktor-serialization:$ktorVersion")
-    api("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+    api(libs.ktor.server.core)
+    api(libs.kotlinx.coroutines.core)
+    testImplementation(project(":testhelpers"))
 }
 
 tasks.getByName<Test>("test") {

api/src/main/kotlin/com/wbrawner/twigs/ApiUtils.kt

@@ -1,62 +0,0 @@
-package com.wbrawner.twigs
-
-import com.wbrawner.twigs.model.Budget
-import com.wbrawner.twigs.model.Permission
-import com.wbrawner.twigs.model.Session
-import com.wbrawner.twigs.storage.BudgetRepository
-import com.wbrawner.twigs.storage.PermissionRepository
-import io.ktor.application.*
-import io.ktor.auth.*
-import io.ktor.http.*
-import io.ktor.response.*
-import io.ktor.util.pipeline.*
-
-suspend inline fun PipelineContext<Unit, ApplicationCall>.requireBudgetWithPermission(
-    permissionRepository: PermissionRepository,
-    userId: String,
-    budgetId: String?,
-    permission: Permission,
-    otherwise: () -> Unit
-) {
-    if (budgetId.isNullOrBlank()) {
-        errorResponse(HttpStatusCode.BadRequest, "budgetId is required")
-        return
-    }
-    permissionRepository.findAll(
-        userId = userId,
-        budgetIds = listOf(budgetId)
-    ).firstOrNull {
-        it.permission.isAtLeast(permission)
-    } ?: run {
-        errorResponse(HttpStatusCode.Forbidden, "Insufficient permissions on budget $budgetId")
-        otherwise()
-    }
-}
-
-suspend fun PipelineContext<Unit, ApplicationCall>.budgetWithPermission(
-    budgetRepository: BudgetRepository,
-    permissionRepository: PermissionRepository,
-    budgetId: String,
-    permission: Permission,
-    block: suspend (Budget) -> Unit
-) {
-    val session = call.principal<Session>()!!
-    val userPermission = permissionRepository.findAll(
-        userId = session.userId,
-        budgetIds = listOf(budgetId)
-    ).firstOrNull()
-    if (userPermission?.permission?.isAtLeast(permission) != true) {
-        errorResponse(HttpStatusCode.Forbidden)
-        return
-    }
-    block(budgetRepository.findAll(ids = listOf(budgetId)).first())
-}
-
-suspend inline fun PipelineContext<Unit, ApplicationCall>.errorResponse(
-    httpStatusCode: HttpStatusCode = HttpStatusCode.NotFound,
-    message: String? = null
-) {
-    message?.let {
-        call.respond(httpStatusCode, ErrorResponse(message))
-    }?: call.respond(httpStatusCode)
-}

api/src/main/kotlin/com/wbrawner/twigs/BudgetRoutes.kt

@@ -1,107 +1,57 @@
 package com.wbrawner.twigs
 
-import com.wbrawner.twigs.model.Budget
-import com.wbrawner.twigs.model.Permission
-import com.wbrawner.twigs.model.Session
-import com.wbrawner.twigs.model.UserPermission
-import com.wbrawner.twigs.storage.BudgetRepository
-import com.wbrawner.twigs.storage.PermissionRepository
-import io.ktor.application.*
-import io.ktor.auth.*
+import com.wbrawner.twigs.service.budget.BudgetService
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.respondCatching
 import io.ktor.http.*
-import io.ktor.request.*
-import io.ktor.response.*
-import io.ktor.routing.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.request.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
 
-fun Application.budgetRoutes(
-    budgetRepository: BudgetRepository,
-    permissionRepository: PermissionRepository
-) {
+fun Application.budgetRoutes(budgetService: BudgetService) {
     routing {
         route("/api/budgets") {
             authenticate(optional = false) {
                 get {
-                    val session = call.principal<Session>()!!
-                    val budgetIds = permissionRepository.findAll(userId = session.userId).map { it.budgetId }
-                    if (budgetIds.isEmpty()) {
-                        call.respond(emptyList<BudgetResponse>())
-                        return@get
+                    call.respondCatching {
+                        budgetService.budgetsForUser(userId = requireSession().userId)
                     }
-                    val budgets = budgetRepository.findAll(ids = budgetIds).map {
-                        BudgetResponse(it, permissionRepository.findAll(budgetIds = listOf(it.id)))
-                    }
-                    call.respond(budgets)
                 }
 
                 get("/{id}") {
-                    budgetWithPermission(budgetRepository, permissionRepository, call.parameters["id"]!!, Permission.READ) { budget ->
-                        val users = permissionRepository.findAll(budgetIds = listOf(budget.id))
-                        call.respond(BudgetResponse(budget, users))
+                    call.respondCatching {
+                        budgetService.budget(
+                            budgetId = call.parameters.getOrFail("id"),
+                            userId = requireSession().userId
+                        )
                     }
                 }
 
                 post {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<BudgetRequest>()
-                    if (request.name.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Name cannot be empty or null")
-                        return@post
+                    call.respondCatching {
+                        budgetService.save(request = call.receive(), userId = requireSession().userId)
                     }
-                    val budget = budgetRepository.save(
-                        Budget(
-                            name = request.name,
-                            description = request.description
-                        )
-                    )
-                    val users = request.users?.map {
-                        permissionRepository.save(
-                            UserPermission(
-                                budgetId = budget.id,
-                                userId = it.user,
-                                permission = it.permission
-                            )
-                        )
-                    }?.toMutableSet() ?: mutableSetOf()
-                    if (users.none { it.userId == session.userId }) {
-                        users.add(
-                            permissionRepository.save(
-                                UserPermission(
-                                    budgetId = budget.id,
-                                    userId = session.userId,
-                                    permission = Permission.OWNER
-                                )
-                            )
-                        )
-                    }
-                    call.respond(BudgetResponse(budget, users))
                 }
 
                 put("/{id}") {
-                    budgetWithPermission(budgetRepository, permissionRepository, call.parameters["id"]!!, Permission.MANAGE) { budget ->
-                        val request = call.receive<BudgetRequest>()
-                        val name = request.name ?: budget.name
-                        val description = request.description ?: budget.description
-                        val users = request.users?.map {
-                            permissionRepository.save(UserPermission(budget.id, it.user, it.permission))
-                        } ?: permissionRepository.findAll(budgetIds = listOf(budget.id))
-                        permissionRepository.findAll(budgetIds = listOf(budget.id)).forEach {
-                            if (it.permission != Permission.OWNER && users.none { userPermission -> userPermission.userId == it.userId }) {
-                                permissionRepository.delete(it)
-                            }
-                        }
-                        call.respond(
-                            BudgetResponse(
-                                budgetRepository.save(budget.copy(name = name, description = description)),
-                                users
-                            )
+                    call.respondCatching {
+                        budgetService.save(
+                            request = call.receive(),
+                            userId = requireSession().userId,
+                            budgetId = call.parameters.getOrFail("id")
                         )
                     }
                 }
 
                 delete("/{id}") {
-                    budgetWithPermission(budgetRepository, permissionRepository, budgetId = call.parameters["id"]!!, Permission.OWNER) { budget ->
-                        budgetRepository.delete(budget)
-                        call.respond(HttpStatusCode.NoContent)
+                    call.respondCatching {
+                        budgetService.delete(
+                            budgetId = call.parameters.getOrFail("id"),
+                            userId = requireSession().userId
+                        )
+                        HttpStatusCode.NoContent
                     }
                 }
             }

api/src/main/kotlin/com/wbrawner/twigs/CategoryRoutes.kt

@@ -1,139 +1,64 @@
 package com.wbrawner.twigs
 
-import com.wbrawner.twigs.model.Category
-import com.wbrawner.twigs.model.Permission
-import com.wbrawner.twigs.model.Session
-import com.wbrawner.twigs.storage.CategoryRepository
-import com.wbrawner.twigs.storage.PermissionRepository
-import io.ktor.application.*
-import io.ktor.auth.*
+import com.wbrawner.twigs.service.category.CategoryRequest
+import com.wbrawner.twigs.service.category.CategoryService
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.respondCatching
 import io.ktor.http.*
-import io.ktor.request.*
-import io.ktor.response.*
-import io.ktor.routing.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.request.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
 
-fun Application.categoryRoutes(
-    categoryRepository: CategoryRepository,
-    permissionRepository: PermissionRepository
-) {
+fun Application.categoryRoutes(categoryService: CategoryService) {
     routing {
         route("/api/categories") {
             authenticate(optional = false) {
                 get {
-                    val session = call.principal<Session>()!!
-                    val budgetIds = permissionRepository.findAll(
-                        budgetIds = call.request.queryParameters.getAll("budgetIds"),
-                        userId = session.userId
-                    ).map { it.budgetId }
-                    if (budgetIds.isEmpty()) {
-                        call.respond(emptyList<CategoryResponse>())
-                        return@get
+                    call.respondCatching {
+                        categoryService.categories(
+                            budgetIds = call.request.queryParameters.getAll("budgetIds").orEmpty(),
+                            userId = requireSession().userId,
+                            expense = call.request.queryParameters["expense"]?.toBoolean(),
+                            archived = call.request.queryParameters["archived"]?.toBoolean()
+                        )
                     }
-                    call.respond(categoryRepository.findAll(
-                        budgetIds = budgetIds,
-                        expense = call.request.queryParameters["expense"]?.toBoolean(),
-                        archived = call.request.queryParameters["archived"]?.toBoolean()
-                    ).map { it.asResponse() })
                 }
 
                 get("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val budgetIds = permissionRepository.findAll(userId = session.userId).map { it.budgetId }
-                    if (budgetIds.isEmpty()) {
-                        errorResponse()
-                        return@get
+                    call.respondCatching {
+                        categoryService.category(
+                            categoryId = call.parameters.getOrFail("id"),
+                            userId = requireSession().userId
+                        )
                     }
-                    categoryRepository.findAll(
-                        ids = call.parameters.getAll("id"),
-                        budgetIds = budgetIds
-                    )
-                        .map { it.asResponse() }
-                        .firstOrNull()?.let {
-                            call.respond(it)
-                        } ?: errorResponse()
                 }
 
                 post {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<CategoryRequest>()
-                    if (request.title.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Title cannot be null or empty")
-                        return@post
+                    call.respondCatching {
+                        categoryService.save(call.receive<CategoryRequest>(), requireSession().userId)
                     }
-                    if (request.budgetId.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Budget ID cannot be null or empty")
-                        return@post
-                    }
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        request.budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@post
-                    }
-                    call.respond(
-                        categoryRepository.save(
-                            Category(
-                                title = request.title,
-                                description = request.description,
-                                amount = request.amount ?: 0L,
-                                expense = request.expense ?: true,
-                                budgetId = request.budgetId
-                            )
-                        ).asResponse()
-                    )
                 }
 
                 put("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<CategoryRequest>()
-                    val category = categoryRepository.findAll(ids = call.parameters.getAll("id"))
-                        .firstOrNull()
-                        ?: run {
-                            call.respond(HttpStatusCode.NotFound)
-                            return@put
-                        }
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        category.budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@put
+                    call.respondCatching {
+                        categoryService.save(
+                            request = call.receive<CategoryRequest>(),
+                            userId = requireSession().userId,
+                            categoryId = call.parameters.getOrFail("id")
+                        )
                     }
-                    call.respond(
-                        categoryRepository.save(
-                            category.copy(
-                                title = request.title ?: category.title,
-                                description = request.description ?: category.description,
-                                amount = request.amount ?: category.amount,
-                                expense = request.expense ?: category.expense,
-                                archived = request.archived ?: category.archived,
-                            )
-                        ).asResponse()
-                    )
                 }
 
                 delete("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val categoryId = call.parameters.entries().first().value
-                    val category = categoryRepository.findAll(ids = categoryId)
-                        .firstOrNull()
-                        ?: run {
-                            errorResponse(HttpStatusCode.NotFound)
-                            return@delete
-                        }
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        category.budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@delete
+                    call.respondCatching {
+                        categoryService.delete(
+                            call.parameters.getOrFail("id"),
+                            requireSession().userId
+                        )
+                        HttpStatusCode.NoContent
                     }
-                    categoryRepository.delete(category)
-                    call.respond(HttpStatusCode.NoContent)
                 }
             }
         }

api/src/main/kotlin/com/wbrawner/twigs/ErrorResponse.kt

@@ -1,6 +0,0 @@
-package com.wbrawner.twigs
-
-import kotlinx.serialization.Serializable
-
-@Serializable
-data class ErrorResponse(val message: String)

api/src/main/kotlin/com/wbrawner/twigs/RecurringTransactionRoutes.kt

@@ -1,158 +1,59 @@
 package com.wbrawner.twigs
 
-import com.wbrawner.twigs.model.Permission
-import com.wbrawner.twigs.model.RecurringTransaction
-import com.wbrawner.twigs.model.Session
-import com.wbrawner.twigs.storage.PermissionRepository
-import com.wbrawner.twigs.storage.RecurringTransactionRepository
-import io.ktor.application.*
-import io.ktor.auth.*
+import com.wbrawner.twigs.service.recurringtransaction.RecurringTransactionRequest
+import com.wbrawner.twigs.service.recurringtransaction.RecurringTransactionService
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.respondCatching
 import io.ktor.http.*
-import io.ktor.request.*
-import io.ktor.response.*
-import io.ktor.routing.*
-import io.ktor.util.pipeline.*
-import java.time.Instant
-
-fun Application.recurringTransactionRoutes(
-    recurringTransactionRepository: RecurringTransactionRepository,
-    permissionRepository: PermissionRepository
-) {
-    suspend fun PipelineContext<Unit, ApplicationCall>.recurringTransactionAfterPermissionCheck(
-        id: String?,
-        userId: String,
-        success: suspend (RecurringTransaction) -> Unit
-    ) {
-        if (id.isNullOrBlank()) {
-            errorResponse(HttpStatusCode.BadRequest, "id is required")
-            return
-        }
-        val recurringTransaction = recurringTransactionRepository.findAll(ids = listOf(id)).firstOrNull()
-            ?: run {
-                errorResponse()
-                return
-            }
-        requireBudgetWithPermission(
-            permissionRepository,
-            userId,
-            recurringTransaction.budgetId,
-            Permission.WRITE
-        ) {
-            application.log.info("No permissions on budget ${recurringTransaction.budgetId}.")
-            return
-        }
-        success(recurringTransaction)
-    }
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.request.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
 
+fun Application.recurringTransactionRoutes(recurringTransactionService: RecurringTransactionService) {
     routing {
         route("/api/recurringtransactions") {
             authenticate(optional = false) {
                 get {
-                    val session = call.principal<Session>()!!
-                    val budgetId = call.request.queryParameters["budgetId"]
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@get
-                    }
-                    call.respond(
-                        recurringTransactionRepository.findAll(
-                            budgetId = budgetId!!
-                        ).map { it.asResponse() }
-                    )
-                }
-
-                get("/{id}") {
-                    val session = call.principal<Session>()!!
-                    recurringTransactionAfterPermissionCheck(call.parameters["id"]!!, session.userId) {
-                        call.respond(it.asResponse())
-                    }
-                }
-
-                post {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<RecurringTransactionRequest>()
-                    if (request.title.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Title cannot be null or empty")
-                        return@post
-                    }
-                    if (request.budgetId.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Budget ID cannot be null or empty")
-                        return@post
-                    }
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        request.budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@post
-                    }
-                    call.respond(
-                        recurringTransactionRepository.save(
-                            RecurringTransaction(
-                                title = request.title,
-                                description = request.description,
-                                amount = request.amount ?: 0L,
-                                expense = request.expense ?: true,
-                                budgetId = request.budgetId,
-                                categoryId = request.categoryId,
-                                createdBy = session.userId,
-                                start = request.start?.toInstant() ?: Instant.now(),
-                                finish = request.finish?.toInstant(),
-                                frequency = request.frequency.asFrequency()
-                            )
-                        ).asResponse()
-                    )
-                }
-
-                put("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<RecurringTransactionRequest>()
-                    recurringTransactionAfterPermissionCheck(
-                        call.parameters["id"]!!,
-                        session.userId
-                    ) { recurringTransaction ->
-                        if (request.budgetId != recurringTransaction.budgetId) {
-                            requireBudgetWithPermission(
-                                permissionRepository,
-                                session.userId,
-                                request.budgetId,
-                                Permission.WRITE
-                            ) {
-                                return@recurringTransactionAfterPermissionCheck
-                            }
-                        }
-                        call.respond(
-                            recurringTransactionRepository.save(
-                                recurringTransaction.copy(
-                                    title = request.title ?: recurringTransaction.title,
-                                    description = request.description ?: recurringTransaction.description,
-                                    amount = request.amount ?: recurringTransaction.amount,
-                                    expense = request.expense ?: recurringTransaction.expense,
-                                    categoryId = request.categoryId ?: recurringTransaction.categoryId,
-                                    budgetId = request.budgetId ?: recurringTransaction.budgetId,
-                                    start = request.start?.toInstant() ?: recurringTransaction.start,
-                                    finish = request.finish?.toInstant() ?: recurringTransaction.finish,
-                                    frequency = request.frequency.asFrequency()
-                                )
-                            ).asResponse()
+                    call.respondCatching {
+                        recurringTransactionService.recurringTransactions(
+                            budgetId = call.request.queryParameters.getOrFail("budgetId"),
+                            userId = requireSession().userId
                         )
                     }
                 }
 
+                get("/{id}") {
+                    call.respondCatching {
+                        recurringTransactionService.recurringTransaction(
+                            call.parameters.getOrFail("id"),
+                            requireSession().userId
+                        )
+                    }
+                }
+
+                post {
+                    call.respondCatching {
+                        recurringTransactionService.save(
+                            request = call.receive<RecurringTransactionRequest>(),
+                            userId = requireSession().userId
+                        )
+                    }
+                }
+
+                put("/{id}") {
+                    recurringTransactionService.save(
+                        request = call.receive<RecurringTransactionRequest>(),
+                        userId = requireSession().userId,
+                        recurringTransactionId = call.parameters.getOrFail("id")
+                    )
+                }
+
                 delete("/{id}") {
-                    val session = call.principal<Session>()!!
-                    recurringTransactionAfterPermissionCheck(call.parameters["id"]!!, session.userId) {
-                        val response = if (recurringTransactionRepository.delete(it)) {
-                            HttpStatusCode.NoContent
-                        } else {
-                            HttpStatusCode.InternalServerError
-                        }
-                        call.respond(response)
+                    call.respondCatching {
+                        recurringTransactionService.delete(call.parameters.getOrFail("id"), requireSession().userId)
+                        HttpStatusCode.NoContent
                     }
                 }
             }

api/src/main/kotlin/com/wbrawner/twigs/TransactionRoutes.kt

@@ -1,169 +1,85 @@
 package com.wbrawner.twigs
 
-import com.wbrawner.twigs.model.Permission
-import com.wbrawner.twigs.model.Session
-import com.wbrawner.twigs.model.Transaction
-import com.wbrawner.twigs.storage.PermissionRepository
-import com.wbrawner.twigs.storage.TransactionRepository
-import io.ktor.application.*
-import io.ktor.auth.*
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.respondCatching
+import com.wbrawner.twigs.service.transaction.BalanceResponse
+import com.wbrawner.twigs.service.transaction.TransactionRequest
+import com.wbrawner.twigs.service.transaction.TransactionService
 import io.ktor.http.*
-import io.ktor.request.*
-import io.ktor.response.*
-import io.ktor.routing.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.request.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
 import java.time.Instant
 
-fun Application.transactionRoutes(
-    transactionRepository: TransactionRepository,
-    permissionRepository: PermissionRepository
-) {
+fun Application.transactionRoutes(transactionService: TransactionService) {
     routing {
         route("/api/transactions") {
             authenticate(optional = false) {
                 get {
-                    val session = call.principal<Session>()!!
-                    call.respond(
-                        transactionRepository.findAll(
-                            budgetIds = permissionRepository.findAll(
-                                budgetIds = call.request.queryParameters.getAll("budgetIds"),
-                                userId = session.userId
-                            ).map { it.budgetId },
+                    call.respondCatching {
+                        transactionService.transactions(
+                            budgetIds = call.request.queryParameters.getAll("budgetIds").orEmpty(),
                             categoryIds = call.request.queryParameters.getAll("categoryIds"),
                             from = call.request.queryParameters["from"]?.let { Instant.parse(it) },
                             to = call.request.queryParameters["to"]?.let { Instant.parse(it) },
                             expense = call.request.queryParameters["expense"]?.toBoolean(),
-                    ).map { it.asResponse() })
+                            userId = requireSession().userId
+                        )
+                    }
                 }
 
                 get("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val transaction = transactionRepository.findAll(
-                        ids = call.parameters.getAll("id"),
-                        budgetIds = permissionRepository.findAll(
-                            userId = session.userId
+                    call.respondCatching {
+                        transactionService.transaction(
+                            transactionId = call.parameters.getOrFail("id"),
+                            userId = requireSession().userId
                         )
-                            .map { it.budgetId }
-                    )
-                        .map { it.asResponse() }
-                        .firstOrNull()
-                    transaction?.let {
-                        call.respond(it)
-                    } ?: errorResponse()
+                    }
                 }
 
                 get("/sum") {
-                    val categoryId = call.request.queryParameters["categoryId"]
-                    val budgetId = call.request.queryParameters["budgetId"]
-                    val from = call.request.queryParameters["from"]?.toInstant() ?: firstOfMonth
-                    val to = call.request.queryParameters["to"]?.toInstant() ?: endOfMonth
-                    val balance = if (!categoryId.isNullOrBlank()) {
-                        if (!budgetId.isNullOrBlank()) {
-                            errorResponse(
-                                HttpStatusCode.BadRequest,
-                                "budgetId and categoryId cannot be provided together"
+                    call.respondCatching {
+                        BalanceResponse(
+                            transactionService.sum(
+                                budgetId = call.request.queryParameters["budgetId"],
+                                categoryId = call.request.queryParameters["categoryId"],
+                                from = call.request.queryParameters["from"]?.toInstant() ?: firstOfMonth,
+                                to = call.request.queryParameters["to"]?.toInstant() ?: endOfMonth,
+                                userId = requireSession().userId,
                             )
-                            return@get
-                        }
-                        transactionRepository.sumByCategory(categoryId, from, to)
-                    } else if (!budgetId.isNullOrBlank()) {
-                        transactionRepository.sumByBudget(budgetId, from, to)
-                    } else {
-                        errorResponse(HttpStatusCode.BadRequest, "budgetId or categoryId must be provided to sum")
-                        return@get
+                        )
                     }
-                    call.respond(BalanceResponse(balance))
                 }
 
                 post {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<TransactionRequest>()
-                    if (request.title.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Title cannot be null or empty")
-                        return@post
+                    call.respondCatching {
+                        transactionService.save(
+                            request = call.receive<TransactionRequest>(),
+                            userId = requireSession().userId
+                        )
                     }
-                    if (request.budgetId.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Budget ID cannot be null or empty")
-                        return@post
-                    }
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        request.budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@post
-                    }
-                    call.respond(
-                        transactionRepository.save(
-                            Transaction(
-                                title = request.title,
-                                description = request.description,
-                                amount = request.amount ?: 0L,
-                                expense = request.expense ?: true,
-                                budgetId = request.budgetId,
-                                categoryId = request.categoryId,
-                                createdBy = session.userId,
-                                date = request.date?.let { Instant.parse(it) } ?: Instant.now()
-                            )
-                        ).asResponse()
-                    )
                 }
 
                 put("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<TransactionRequest>()
-                    val transaction = transactionRepository.findAll(ids = call.parameters.getAll("id"))
-                        .firstOrNull()
-                        ?: run {
-                            errorResponse()
-                            return@put
-                        }
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        transaction.budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@put
+                    call.respondCatching {
+                        transactionService.save(
+                            request = call.receive<TransactionRequest>(),
+                            userId = requireSession().userId,
+                            transactionId = call.parameters.getOrFail("id")
+                        )
                     }
-                    call.respond(
-                        transactionRepository.save(
-                            transaction.copy(
-                                title = request.title ?: transaction.title,
-                                description = request.description ?: transaction.description,
-                                amount = request.amount ?: transaction.amount,
-                                expense = request.expense ?: transaction.expense,
-                                date = request.date?.let { Instant.parse(it) } ?: transaction.date,
-                                categoryId = request.categoryId ?: transaction.categoryId,
-                                budgetId = request.budgetId ?: transaction.budgetId,
-                                createdBy = transaction.createdBy,
-                            )
-                        ).asResponse()
-                    )
                 }
 
                 delete("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val transaction = transactionRepository.findAll(ids = call.parameters.getAll("id"))
-                        .firstOrNull()
-                        ?: run {
-                            errorResponse()
-                            return@delete
-                        }
-                    requireBudgetWithPermission(
-                        permissionRepository,
-                        session.userId,
-                        transaction.budgetId,
-                        Permission.WRITE
-                    ) {
-                        return@delete
-                    }
-                    val response = if (transactionRepository.delete(transaction)) {
+                    call.respondCatching {
+                        transactionService.delete(
+                            transactionId = call.parameters.getOrFail("id"),
+                            userId = requireSession().userId
+                        )
                         HttpStatusCode.NoContent
-                    } else {
-                        HttpStatusCode.InternalServerError
                     }
-                    call.respond(response)
                 }
             }
         }

api/src/main/kotlin/com/wbrawner/twigs/UserRoutes.kt

@@ -1,142 +1,82 @@
 package com.wbrawner.twigs
 
-import com.wbrawner.twigs.model.Session
-import com.wbrawner.twigs.model.User
-import com.wbrawner.twigs.storage.PermissionRepository
-import com.wbrawner.twigs.storage.SessionRepository
-import com.wbrawner.twigs.storage.UserRepository
-import io.ktor.application.*
-import io.ktor.auth.*
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.respondCatching
+import com.wbrawner.twigs.service.user.UserService
 import io.ktor.http.*
-import io.ktor.request.*
-import io.ktor.response.*
-import io.ktor.routing.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.request.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
 
-fun Application.userRoutes(
-    permissionRepository: PermissionRepository,
-    sessionRepository: SessionRepository,
-    userRepository: UserRepository
-) {
+fun Application.userRoutes(userService: UserService) {
     routing {
         route("/api/users") {
             post("/login") {
-                val request = call.receive<LoginRequest>()
-                val user =
-                    userRepository.findAll(nameOrEmail = request.username, password = request.password.hash())
-                        .firstOrNull()
-                        ?: userRepository.findAll(nameOrEmail = request.username, password = request.password.hash())
-                            .firstOrNull()
-                        ?: run {
-                            errorResponse(HttpStatusCode.Unauthorized, "Invalid credentials")
-                            return@post
-                        }
-                val session = sessionRepository.save(Session(userId = user.id))
-                call.respond(session.asResponse())
+                call.respondCatching {
+                    userService.login(call.receive())
+                }
             }
 
             post("/register") {
-                val request = call.receive<UserRequest>()
-                if (request.username.isNullOrBlank()) {
-                    errorResponse(HttpStatusCode.BadRequest, "Username must not be null or blank")
-                    return@post
+                call.respondCatching {
+                    userService.register(call.receive())
                 }
-                if (request.password.isNullOrBlank()) {
-                    errorResponse(HttpStatusCode.BadRequest, "Password must not be null or blank")
-                    return@post
+            }
+
+
+            route("/resetpassword") {
+                post {
+                    call.respondCatching {
+                        userService.requestPasswordResetEmail(call.receive())
+                        HttpStatusCode.Accepted
+                    }
+                }
+
+                put {
+                    call.respondCatching {
+                        userService.resetPassword(call.receive())
+                        HttpStatusCode.NoContent
+                    }
                 }
-                call.respond(
-                    userRepository.save(
-                        User(
-                            name = request.username,
-                            password = request.password.hash(),
-                            email = request.email
-                        )
-                    ).asResponse()
-                )
             }
 
             authenticate(optional = false) {
                 get {
-                    val query = call.request.queryParameters.getAll("query")
-                    if (query?.firstOrNull()?.isNotBlank() == true) {
-                        call.respond(userRepository.findAll(nameLike = query.first()).map { it.asResponse() })
-                        return@get
+                    call.respondCatching {
+                        userService.users(
+                            query = call.request.queryParameters["query"],
+                            budgetIds = call.request.queryParameters.getAll("budgetId"),
+                            requestingUserId = requireSession().userId
+                        )
                     }
-                    permissionRepository.findAll(
-                        budgetIds = call.request.queryParameters.getAll("budgetId")
-                    ).mapNotNull {
-                        userRepository.findAll(ids = listOf(it.userId))
-                            .firstOrNull()
-                            ?.asResponse()
-                    }.run { call.respond(this) }
                 }
 
                 get("/{id}") {
-                    userRepository.findAll(ids = call.parameters.getAll("id"))
-                        .firstOrNull()
-                        ?.asResponse()
-                        ?.let { call.respond(it) }
-                        ?: errorResponse(HttpStatusCode.NotFound)
-                }
-
-                post {
-                    val request = call.receive<UserRequest>()
-                    if (request.username.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Username must not be null or blank")
-                        return@post
+                    call.respondCatching {
+                        userService.user(call.parameters.getOrFail("id"))
                     }
-                    if (request.password.isNullOrBlank()) {
-                        errorResponse(HttpStatusCode.BadRequest, "Password must not be null or blank")
-                        return@post
-                    }
-                    call.respond(
-                        userRepository.save(
-                            User(
-                                name = request.username,
-                                password = request.password,
-                                email = request.email
-                            )
-                        ).asResponse()
-                    )
                 }
 
                 put("/{id}") {
-                    val session = call.principal<Session>()!!
-                    val request = call.receive<UserRequest>()
-                    // TODO: Add some kind of admin denotation to allow admins to edit other users
-                    if (call.parameters["id"] != session.userId) {
-                        errorResponse(HttpStatusCode.Forbidden)
-                        return@put
+                    call.respondCatching {
+                        userService.save(
+                            request = call.receive(),
+                            targetUserId = call.parameters.getOrFail("id"),
+                            requestingUserId = requireSession().userId
+                        )
                     }
-                    call.respond(
-                        userRepository.save(
-                            userRepository.findAll(ids = call.parameters.getAll("id"))
-                                .first()
-                                .run {
-                                    copy(
-                                        name = request.username ?: name,
-                                        password = request.password?.hash() ?: password,
-                                        email = request.email ?: email
-                                    )
-                                }
-                        ).asResponse()
-                    )
                 }
 
                 delete("/{id}") {
-                    val session = call.principal<Session>()!!
-                    // TODO: Add some kind of admin denotation to allow admins to delete other users
-                    val user = userRepository.findAll(call.parameters.entries().first().value).firstOrNull()
-                    if (user == null) {
-                        errorResponse()
-                        return@delete
+                    call.respondCatching {
+                        userService.delete(
+                            targetUserId = call.parameters.getOrFail("id"),
+                            requestingUserId = requireSession().userId
+                        )
+                        HttpStatusCode.NoContent
                     }
-                    if (user.id != session.userId) {
-                        errorResponse(HttpStatusCode.Forbidden)
-                        return@delete
-                    }
-                    userRepository.delete(user)
-                    call.respond(HttpStatusCode.NoContent)
                 }
             }
         }

app/build.gradle.kts

@@ -1,11 +1,10 @@
 import java.net.URI
-import java.util.*
 
 plugins {
     java
     kotlin("jvm")
     application
-    id("com.github.johnrengelman.shadow") version "7.0.0"
+    alias(libs.plugins.shadow)
 }
 
 repositories {
@@ -16,24 +15,21 @@ repositories {
     }
 }
 
-val kotlinVersion: String by rootProject.extra
-val ktorVersion: String by rootProject.extra
-
 dependencies {
     implementation(project(":api"))
     implementation(project(":core"))
     implementation(project(":db"))
     implementation(project(":web"))
-    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlinVersion")
-    implementation("org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion")
-    implementation("io.ktor:ktor-server-core:$ktorVersion")
-    implementation("io.ktor:ktor-server-cio:$ktorVersion")
-    implementation("io.ktor:ktor-server-sessions:$ktorVersion")
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2")
-    implementation("ch.qos.logback:logback-classic:1.2.8")
+    implementation(libs.kotlin.reflect)
+    implementation(libs.bundles.ktor.server)
+    implementation(libs.kotlinx.coroutines.core)
+    implementation(libs.bcrypt)
+    implementation(libs.logback)
+    implementation(libs.mail)
+    implementation(project(mapOf("path" to ":service")))
     testImplementation(project(":testhelpers"))
-    testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+    testImplementation(libs.ktor.client.content.negotiation)
+    testImplementation(libs.ktor.server.test)
 }
 
 description = "twigs-server"
@@ -53,56 +49,13 @@ tasks.shadowJar {
     }
 }
 
-val captainDefinition = File(project.buildDir, "captain-definition")
-val tarFile = File(project.buildDir, "twigs.tar")
-
-tasks.register("package") {
-    dependsOn(":app:shadowJar")
-    doLast {
-        captainDefinition.createNewFile()
-        captainDefinition.outputStream().writer().use {
-            it.appendLine(
-                """
-            {
-                "schemaVersion": 2,
-                "dockerfileLines": [
-                    "FROM adoptopenjdk:openj9",
-                    "COPY libs/twigs.jar twigs.jar",
-                    "CMD /opt/java/openjdk/bin/java ${'$'}JVM_ARGS -jar /twigs.jar"
-                ]
-            }
-        """.trimIndent()
-            )
-        }
-        exec {
-            commandLine(
-                "tar",
-                "-C",
-                project.buildDir.absolutePath,
-                "-cf",
-                project.buildDir.name + File.separator + tarFile.name,
-                captainDefinition.name,
-                "libs/twigs.jar"
-            )
-        }
-    }
-}
-
-tasks.register("publish") {
-    dependsOn(":app:package")
-    doLast {
-        var command = listOf("caprover", "deploy", "-t", "build/${tarFile.name}", "-n", "wbrawner", "-a", "twigs-dev")
-        command = if (System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("windows")) {
-            listOf("powershell", "-Command") + command
-        } else {
-            listOf("bash", "-c", "\"${command.joinToString(" ")}\"")
-        }
-        exec {
-            commandLine(command)
-        }
-    }
-}
-
 tasks.getByName<Test>("test") {
     useJUnitPlatform()
 }
+
+tasks.test {
+    reports {
+        junitXml.required.set(true)
+        html.required.set(false)
+    }
+}

app/src/main/kotlin/com/wbrawner/twigs/server/Application.kt

@@ -1,164 +1,267 @@
 package com.wbrawner.twigs.server
 
+import at.favre.lib.crypto.bcrypt.BCrypt
+import com.github.mustachejava.DefaultMustacheFactory
 import com.wbrawner.twigs.*
 import com.wbrawner.twigs.db.*
+import com.wbrawner.twigs.model.CookieSession
+import com.wbrawner.twigs.model.HeaderSession
 import com.wbrawner.twigs.model.Session
-import com.wbrawner.twigs.storage.*
+import com.wbrawner.twigs.service.budget.BudgetService
+import com.wbrawner.twigs.service.budget.DefaultBudgetService
+import com.wbrawner.twigs.service.category.CategoryService
+import com.wbrawner.twigs.service.category.DefaultCategoryService
+import com.wbrawner.twigs.service.recurringtransaction.DefaultRecurringTransactionService
+import com.wbrawner.twigs.service.recurringtransaction.RecurringTransactionService
+import com.wbrawner.twigs.service.transaction.DefaultTransactionService
+import com.wbrawner.twigs.service.transaction.TransactionService
+import com.wbrawner.twigs.service.user.DefaultUserService
+import com.wbrawner.twigs.service.user.UserService
+import com.wbrawner.twigs.storage.PasswordHasher
+import com.wbrawner.twigs.web.user.TWIGS_SESSION_COOKIE
 import com.wbrawner.twigs.web.webRoutes
 import com.zaxxer.hikari.HikariConfig
 import com.zaxxer.hikari.HikariDataSource
-import io.ktor.application.*
-import io.ktor.auth.*
-import io.ktor.features.*
+import io.ktor.client.request.forms.*
 import io.ktor.http.*
-import io.ktor.response.*
-import io.ktor.serialization.*
-import io.ktor.sessions.*
-import kotlinx.coroutines.currentCoroutineContext
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.isActive
-import kotlinx.coroutines.launch
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.cio.*
+import io.ktor.server.engine.*
+import io.ktor.server.mustache.*
+import io.ktor.server.plugins.callloging.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
+import io.ktor.server.plugins.forwardedheaders.*
+import io.ktor.server.response.*
+import io.ktor.server.sessions.*
+import kotlinx.coroutines.*
 import kotlinx.serialization.json.Json
 import java.util.concurrent.TimeUnit
 
-fun main(args: Array<String>): Unit = io.ktor.server.cio.EngineMain.main(args)
+fun main() {
+    embeddedServer(
+        CIO,
+        port = System.getenv("PORT")?.toIntOrNull() ?: 8080,
+        module = Application::module
+    ).start(wait = true)
+}
 
-private const val DATABASE_VERSION = 2
+private const val DATABASE_VERSION = 3
 
 fun Application.module() {
-    val dbHost = environment.config.propertyOrNull("twigs.database.host")?.getString() ?: "localhost"
-    val dbPort = environment.config.propertyOrNull("twigs.database.port")?.getString() ?: "5432"
-    val dbName = environment.config.propertyOrNull("twigs.database.name")?.getString() ?: "twigs"
-    val dbUser = environment.config.propertyOrNull("twigs.database.user")?.getString() ?: "twigs"
-    val dbPass = environment.config.propertyOrNull("twigs.database.password")?.getString() ?: "twigs"
-    val jdbcUrl = "jdbc:postgresql://$dbHost:$dbPort/$dbName?stringtype=unspecified"
+    val dbType = System.getenv("TWIGS_DB_TYPE") ?: "sqlite"
+    val dbHost = System.getenv("TWIGS_DB_HOST") ?: "localhost"
+    val dbPort = System.getenv("TWIGS_DB_PORT") ?: "5432"
+    val dbName = System.getenv("TWIGS_DB_NAME") ?: "twigs"
+    val dbUser = System.getenv("TWIGS_DB_USER") ?: "twigs"
+    val dbPass = System.getenv("TWIGS_DB_PASS") ?: "twigs"
+    val jdbcUrl = when (dbType) {
+        "postgresql" -> {
+            "jdbc:$dbType://$dbHost:$dbPort/$dbName?stringtype=unspecified"
+        }
+
+        "sqlite" -> {
+            Class.forName("org.sqlite.JDBC")
+            "jdbc:$dbType:$dbName"
+        }
+
+        else -> {
+            throw RuntimeException("Unsupported DB type: $dbType")
+        }
+    }
     HikariDataSource(HikariConfig().apply {
         setJdbcUrl(jdbcUrl)
         username = dbUser
         password = dbPass
     }).also {
+        val metadataRepository = JdbcMetadataRepository(it)
+        val metadata = runBlocking {
+            val metadata = (metadataRepository.findAll().firstOrNull() ?: DatabaseMetadata())
+            var version = metadata.version
+            while (currentCoroutineContext().isActive && version++ < DATABASE_VERSION) {
+                metadataRepository.runMigration(version)
+                metadataRepository.save(metadata.copy(version = version))
+            }
+            if (metadata.salt.isBlank()) {
+                metadataRepository.save(
+                    metadata.copy(
+                        salt = System.getenv("TWIGS_PW_SALT")
+                            ?: randomString(16)
+                    )
+                )
+            } else {
+                metadata
+            }
+        }
+        val budgetRepository = JdbcBudgetRepository(it)
+        val categoryRepository = JdbcCategoryRepository(it)
+        val permissionRepository = JdbcPermissionRepository(it)
+        val passwordResetRepository = JdbcPasswordResetRepository(it)
+        val passwordHasher = PasswordHasher { password ->
+            String(BCrypt.withDefaults().hash(10, metadata.salt.toByteArray(), password.toByteArray()))
+        }
+        val recurringTransactionRepository = JdbcRecurringTransactionRepository(it)
+        val sessionRepository = JdbcSessionRepository(it)
+        val transactionRepository = JdbcTransactionRepository(it)
+        val userRepository = JdbcUserRepository(it)
+        val emailService = SmtpEmailService(
+            from = System.getenv("TWIGS_SMTP_FROM"),
+            host = System.getenv("TWIGS_SMTP_HOST"),
+            port = System.getenv("TWIGS_SMTP_PORT")?.toIntOrNull(),
+            username = System.getenv("TWIGS_SMTP_USER"),
+            password = System.getenv("TWIGS_SMTP_PASS"),
+        )
+        val jobs = listOf(
+            SessionCleanupJob(sessionRepository),
+            RecurringTransactionProcessingJob(recurringTransactionRepository, transactionRepository)
+        )
+        val sessionValidator: suspend ApplicationCall.(Session) -> Principal? = validate@{ session ->
+            application.environment.log.info("Validating session")
+            val storedSession = sessionRepository.findAll(session.token)
+                .firstOrNull()
+            if (storedSession == null) {
+                application.environment.log.info("Did not find session!")
+                return@validate null
+            } else {
+                application.environment.log.info("Found session!")
+            }
+            return@validate if (twoWeeksFromNow.isAfter(storedSession.expiration)) {
+                sessionRepository.save(storedSession.updateExpiration(newExpiration = twoWeeksFromNow))
+            } else {
+                null
+            }
+        }
         moduleWithDependencies(
-            metadataRepository = MetadataRepository(it),
-            budgetRepository = JdbcBudgetRepository(it),
-            categoryRepository = JdbcCategoryRepository(it),
-            permissionRepository = JdbcPermissionRepository(it),
-            recurringTransactionRepository = JdbcRecurringTransactionRepository(it),
-            sessionRepository = JdbcSessionRepository(it),
-            transactionRepository = JdbcTransactionRepository(it),
-            userRepository = JdbcUserRepository(it)
+            budgetService = DefaultBudgetService(budgetRepository, permissionRepository),
+            categoryService = DefaultCategoryService(categoryRepository, permissionRepository),
+            recurringTransactionService = DefaultRecurringTransactionService(
+                recurringTransactionRepository,
+                permissionRepository
+            ),
+            transactionService = DefaultTransactionService(
+                transactionRepository,
+                categoryRepository,
+                permissionRepository
+            ),
+            userService = DefaultUserService(
+                emailService,
+                passwordResetRepository,
+                permissionRepository,
+                sessionRepository,
+                userRepository,
+                passwordHasher
+            ),
+            jobs = jobs,
+            sessionValidator = sessionValidator
         )
     }
 }
 
 fun Application.moduleWithDependencies(
-    metadataRepository: MetadataRepository,
-    budgetRepository: BudgetRepository,
-    categoryRepository: CategoryRepository,
-    permissionRepository: PermissionRepository,
-    recurringTransactionRepository: RecurringTransactionRepository,
-    sessionRepository: SessionRepository,
-    transactionRepository: TransactionRepository,
-    userRepository: UserRepository
+    budgetService: BudgetService,
+    categoryService: CategoryService,
+    recurringTransactionService: RecurringTransactionService,
+    transactionService: TransactionService,
+    userService: UserService,
+    jobs: List<Job>,
+    sessionValidator: suspend ApplicationCall.(Session) -> Principal?
 ) {
+    install(XForwardedHeaders)
     install(CallLogging)
     install(Authentication) {
         session<Session> {
             challenge {
                 call.respond(HttpStatusCode.Unauthorized)
             }
-            validate { session ->
-                environment.log.info("Validating session")
-                val storedSession = sessionRepository.findAll(session.token)
-                    .firstOrNull()
-                if (storedSession == null) {
-                    environment.log.info("Did not find session!")
-                    return@validate null
-                } else {
-                    environment.log.info("Found session!")
-                }
-                return@validate if (twoWeeksFromNow.isAfter(storedSession.expiration)) {
-                    sessionRepository.save(storedSession.copy(expiration = twoWeeksFromNow))
-                } else {
-                    null
-                }
+            validate(sessionValidator)
+        }
+        session<CookieSession>(TWIGS_SESSION_COOKIE) {
+            challenge {
+                call.respond(HttpStatusCode.Unauthorized)
             }
+            validate(sessionValidator)
         }
     }
     install(Sessions) {
         header<Session>("Authorization") {
             serializer = object : SessionSerializer<Session> {
-                override fun deserialize(text: String): Session {
-                    environment.log.info("Deserializing session!")
-                    return Session(token = text.substringAfter("Bearer "))
+                override fun deserialize(text: String): HeaderSession {
+                    this@moduleWithDependencies.environment.log.info("Deserializing session!")
+                    return HeaderSession(token = text.substringAfter("Bearer "))
                 }
 
                 override fun serialize(session: Session): String = session.token
             }
         }
+
+        cookie<CookieSession>(TWIGS_SESSION_COOKIE) {
+            serializer = object : SessionSerializer<CookieSession> {
+                override fun deserialize(text: String): CookieSession {
+                    this@moduleWithDependencies.environment.log.info("Deserializing session!")
+                    return CookieSession(token = text)
+                }
+
+                override fun serialize(session: CookieSession): String = session.token
+            }
+            cookie.httpOnly = true
+            cookie.secure = true
+            cookie.extensions["SameSite"] = "Strict"
+        }
     }
     install(ContentNegotiation) {
         json(json = Json {
             ignoreUnknownKeys = true
             encodeDefaults = true
+            explicitNulls = false
             isLenient = true
             allowSpecialFloatingPointValues = true
             allowStructuredMapKeys = true
             prettyPrint = false
             useArrayPolymorphism = true
         })
+
+        formData()
     }
     install(CORS) {
-        host("twigs.wbrawner.com", listOf("http", "https")) // TODO: Make configurable
-        method(HttpMethod.Options)
-        method(HttpMethod.Put)
-        method(HttpMethod.Delete)
-        header(HttpHeaders.Authorization)
-        header(HttpHeaders.Accept)
-        header(HttpHeaders.AcceptEncoding)
-        header(HttpHeaders.AcceptLanguage)
-        header(HttpHeaders.Connection)
-        header(HttpHeaders.ContentType)
-        header(HttpHeaders.Host)
-        header(HttpHeaders.Origin)
-        header(HttpHeaders.AccessControlRequestHeaders)
-        header(HttpHeaders.AccessControlRequestMethod)
-        header("Sec-Fetch-Dest")
-        header("Sec-Fetch-Mode")
-        header("Sec-Fetch-Site")
-        header("sec-ch-ua")
-        header("sec-ch-ua-mobile")
-        header("sec-ch-ua-platform")
-        header(HttpHeaders.UserAgent)
-        header("DNT")
+        allowHost("twigs.wbrawner.com", listOf("http", "https")) // TODO: Make configurable
+        allowHost("localhost:4200", listOf("http", "https"))     // TODO: Make configurable
+        allowMethod(HttpMethod.Options)
+        allowMethod(HttpMethod.Get)
+        allowMethod(HttpMethod.Post)
+        allowMethod(HttpMethod.Put)
+        allowMethod(HttpMethod.Delete)
+        allowHeader(HttpHeaders.Authorization)
+        allowHeader(HttpHeaders.Accept)
+        allowHeader(HttpHeaders.AcceptEncoding)
+        allowHeader(HttpHeaders.AcceptLanguage)
+        allowHeader(HttpHeaders.Connection)
+        allowHeader(HttpHeaders.ContentType)
+        allowHeader(HttpHeaders.Host)
+        allowHeader(HttpHeaders.Origin)
+        allowHeader(HttpHeaders.AccessControlRequestHeaders)
+        allowHeader(HttpHeaders.AccessControlRequestMethod)
+        allowHeader("Sec-Fetch-Dest")
+        allowHeader("Sec-Fetch-Mode")
+        allowHeader("Sec-Fetch-Site")
+        allowHeader("sec-ch-ua")
+        allowHeader("sec-ch-ua-mobile")
+        allowHeader("sec-ch-ua-platform")
+        allowHeader(HttpHeaders.UserAgent)
+        allowHeader("DNT")
         allowCredentials = true
     }
-    budgetRoutes(budgetRepository, permissionRepository)
-    categoryRoutes(categoryRepository, permissionRepository)
-    recurringTransactionRoutes(recurringTransactionRepository, permissionRepository)
-    transactionRoutes(transactionRepository, permissionRepository)
-    userRoutes(permissionRepository, sessionRepository, userRepository)
-    webRoutes()
+    install(Mustache) {
+        mustacheFactory = DefaultMustacheFactory("templates")
+    }
+    budgetRoutes(budgetService)
+    categoryRoutes(categoryService)
+    recurringTransactionRoutes(recurringTransactionService)
+    transactionRoutes(transactionService)
+    userRoutes(userService)
+    webRoutes(budgetService, categoryService, transactionService, userService)
     launch {
-        val metadata = (metadataRepository.findAll().firstOrNull() ?: DatabaseMetadata())
-        var version = metadata.version
-        while (currentCoroutineContext().isActive && version++ < DATABASE_VERSION) {
-            metadataRepository.runMigration(version)
-            metadataRepository.save(metadata.copy(version = version))
-        }
-        salt = metadata.salt.ifEmpty {
-            metadataRepository.save(
-                metadata.copy(
-                    salt = environment.config
-                        .propertyOrNull("twigs.password.salt")
-                        ?.getString()
-                        ?: randomString(16)
-                )
-            ).salt
-        }
-        val jobs = listOf(
-            SessionCleanupJob(sessionRepository),
-            RecurringTransactionProcessingJob(recurringTransactionRepository, transactionRepository)
-        )
         while (currentCoroutineContext().isActive) {
             jobs.forEach { it.run() }
             delay(TimeUnit.HOURS.toMillis(1))
@@ -168,4 +271,4 @@ fun Application.moduleWithDependencies(
 
 interface Job {
     suspend fun run()
-}
+}

app/src/main/kotlin/com/wbrawner/twigs/server/SmtpEmailService.kt

@@ -0,0 +1,77 @@
+package com.wbrawner.twigs.server
+
+import com.wbrawner.twigs.EmailService
+import com.wbrawner.twigs.model.PasswordResetToken
+import java.util.*
+import javax.mail.*
+import javax.mail.internet.InternetAddress
+import javax.mail.internet.MimeBodyPart
+import javax.mail.internet.MimeMessage
+import javax.mail.internet.MimeMultipart
+
+
+class SmtpEmailService(
+    val from: String?,
+    val host: String?,
+    val port: Int?,
+    val username: String?,
+    val password: String?
+) : EmailService {
+    private val canSendEmail = !from.isNullOrBlank()
+            && !host.isNullOrBlank()
+            && port != null
+            && !username.isNullOrBlank()
+            && !password.isNullOrBlank()
+
+    private val session = Session.getInstance(
+        Properties().apply {
+            put("mail.smtp.auth", "true")
+            put("mail.smtp.host", host ?: "")
+            put("mail.smtp.port", port ?: 25)
+            put("mail.smtp.from", from ?: "")
+        },
+        object : Authenticator() {
+            override fun getPasswordAuthentication(): PasswordAuthentication {
+                return PasswordAuthentication(username, password)
+            }
+        })
+
+    override fun sendPasswordResetEmail(token: PasswordResetToken, to: String) {
+        val resetUrl = "twigs://resetpassword?token=${token.id}"
+        val plainText = javaClass.getResource("/email/plain/passwordreset.txt")
+            ?.readText()
+            ?.replace("{reset_url}", resetUrl)
+        val html = javaClass.getResource("/email/html/passwordreset.html")
+            ?.readText()
+            ?.replace("{reset_url}", resetUrl)
+        sendEmail(
+            plainText,
+            html,
+            to,
+            "Twigs Password Reset" // TODO: Localization
+        )
+    }
+
+    private fun sendEmail(plainText: String?, html: String?, to: String, subject: String) {
+        if (!canSendEmail) return
+        if (plainText.isNullOrBlank() && html.isNullOrBlank()) return
+        val message = MimeMessage(session)
+        message.setFrom(InternetAddress(from, "Twigs"))
+        message.setRecipients(Message.RecipientType.TO, to)
+        val multipart: Multipart = MimeMultipart("alternative").apply {
+            plainText?.let {
+                addBodyPart(it.asMimeBodyPart("text/plain; charset=utf-8"))
+            }
+            html?.let {
+                addBodyPart(it.asMimeBodyPart("text/html; charset=utf-8"))
+            }
+        }
+        message.setContent(multipart)
+        message.subject = subject
+        Transport.send(message)
+    }
+
+    private fun String.asMimeBodyPart(mimeType: String): MimeBodyPart = MimeBodyPart().apply {
+        setContent(this@asMimeBodyPart, mimeType)
+    }
+}

app/src/main/resources/application.conf

@@ -1,27 +0,0 @@
-ktor {
-    deployment {
-        port = 8080
-        port = ${?TWIGS_PORT}
-    }
-    application {
-        modules = [ com.wbrawner.twigs.server.ApplicationKt.module ]
-    }
-}
-
-twigs {
-    database {
-        host = localhost
-        host = ${?TWIGS_DB_HOST}
-        port = 5432
-        port = ${?TWIGS_DB_PORT}
-        name = twigs
-        name = ${?TWIGS_DB_NAME}
-        user = twigs
-        user = ${?TWIGS_DB_USER}
-        password = twigs
-        password = ${?TWIGS_DB_PASS}
-    }
-    password {
-        salt = ${?TWIGS_PW_SALT}
-    }
-}

app/src/main/resources/email/html/passwordreset.html

@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Twigs - Reset Your Password</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0"
+    "/>
+</head>
+<body>
+<style>
+    html, body {
+        font-family: sans-serif;
+        height: 100%;
+        height: 100vh;
+        background: white;
+    }
+
+    a {
+        color: #30d158;
+    }
+</style>
+<table width="100%" border="0" cellspacing="0" cellpadding="0">
+    <tr>
+        <td align="center">
+            <img src="https://twigs.wbrawner.com/favicon-96x96.png"/>
+        </td>
+    </tr>
+    <tr>
+        <td align="center">
+            <h1>Reset Your Password</h1>
+        </td>
+    </tr>
+    <tr>
+        <td align="center">
+            If you requested a password reset, please <a href="{reset_url}" target="_blank">click here</a> to complete
+            the
+            process. If
+            you didn't make this request,
+            you can ignore this email. Alternatively, you can copy and paste the link below in your browser:
+        </td>
+    </tr>
+    <tr>
+        <td align="center">
+            <pre>{reset_url}</pre>
+        </td>
+    </tr>
+</table>
+
+</body>
+</html>

app/src/main/resources/email/plain/passwordreset.txt

@@ -0,0 +1,5 @@
+Reset Your Password
+
+If you requested a password reset, please open the link below to complete the process. If you didn't make this request, you can ignore this email.
+
+{reset_url}

app/src/main/resources/openapi/documentation.yaml

@@ -0,0 +1,597 @@
+openapi: "3.0.3"
+info:
+  title: "twigs API"
+  description: "twigs API"
+  version: "1.0.0"
+servers:
+  - url: "https://twigs"
+paths:
+  /api/recurringtransactions:
+    get:
+      description: ""
+      parameters:
+        - name: "budgetId"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                type: "array"
+                items:
+                  $ref: "#/components/schemas/RecurringTransactionResponse"
+    post:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/RecurringTransactionResponse"
+  /api/recurringtransactions/{id}:
+    delete:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "204":
+          description: "No Content"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+        "500":
+          description: "Internal Server Error"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+    get:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/RecurringTransactionResponse"
+    put:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/RecurringTransactionResponse"
+  /api/categories:
+    get:
+      description: ""
+      parameters:
+        - name: "budgetIds"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "expense"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "archived"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                type: "array"
+                items:
+                  type: "object"
+    post:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/CategoryResponse"
+  /api/categories/{id}:
+    delete:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "204":
+          description: "No Content"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+    get:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/CategoryResponse"
+    put:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "404":
+          description: "Not Found"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/CategoryResponse"
+  /api/passwordreset:
+    post:
+      description: ""
+      responses:
+        "204":
+          description: "No Content"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+  /api/resetpassword:
+    post:
+      description: ""
+      responses:
+        "202":
+          description: "Accepted"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+  /api/users:
+    get:
+      description: ""
+      parameters:
+        - name: "query"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "budgetId"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                type: "array"
+                items:
+                  type: "object"
+    post:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/UserResponse"
+  /api/users/{id}:
+    delete:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "204":
+          description: "No Content"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+    get:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/UserResponse"
+    put:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/UserResponse"
+  /api/users/login:
+    post:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/SessionResponse"
+  /api/users/register:
+    post:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/UserResponse"
+  /api/budgets:
+    get:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                type: "array"
+                items:
+                  type: "object"
+    post:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/BudgetResponse"
+  /api/budgets/{id}:
+    delete:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "204":
+          description: "No Content"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+    get:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/BudgetResponse"
+    put:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/BudgetResponse"
+  /api/transactions:
+    get:
+      description: ""
+      parameters:
+        - name: "budgetIds"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "categoryIds"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "from"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "to"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "expense"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                type: "array"
+                items:
+                  $ref: "#/components/schemas/TransactionResponse"
+    post:
+      description: ""
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/TransactionResponse"
+  /api/transactions/{id}:
+    delete:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "204":
+          description: "No Content"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+        "500":
+          description: "Internal Server Error"
+          content:
+            '*/*':
+              schema:
+                type: "object"
+    get:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/TransactionResponse"
+    put:
+      description: ""
+      parameters:
+        - name: "id"
+          in: "path"
+          required: true
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/TransactionResponse"
+  /api/transactions/sum:
+    get:
+      description: ""
+      parameters:
+        - name: "categoryId"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "budgetId"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "from"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+        - name: "to"
+          in: "query"
+          required: false
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: "OK"
+          content:
+            '*/*':
+              schema:
+                $ref: "#/components/schemas/BalanceResponse"
+components:
+  schemas:
+    RecurringTransactionResponse:
+      type: "object"
+      properties:
+        id:
+          type: "string"
+        title:
+          type: "string"
+        description:
+          type: "string"
+        frequency:
+          type: "string"
+        start:
+          type: "string"
+        finish:
+          type: "string"
+        amount:
+          type: "integer"
+          format: "int64"
+        expense:
+          type: "boolean"
+        budgetId:
+          type: "string"
+        categoryId:
+          type: "string"
+        createdBy:
+          type: "string"
+    CategoryResponse:
+      type: "object"
+      properties:
+        id:
+          type: "string"
+        title:
+          type: "string"
+        description:
+          type: "string"
+        amount:
+          type: "integer"
+          format: "int64"
+        budgetId:
+          type: "string"
+        expense:
+          type: "boolean"
+        archived:
+          type: "boolean"
+    UserResponse:
+      type: "object"
+      properties:
+        id:
+          type: "string"
+        username:
+          type: "string"
+        email:
+          type: "string"
+    SessionResponse:
+      type: "object"
+      properties:
+        userId:
+          type: "string"
+        token:
+          type: "string"
+        expiration:
+          type: "string"
+    BudgetResponse:
+      type: "object"
+      properties:
+        id:
+          type: "string"
+        name:
+          type: "string"
+        description:
+          type: "string"
+    TransactionResponse:
+      type: "object"
+      properties:
+        id:
+          type: "string"
+        title:
+          type: "string"
+        description:
+          type: "string"
+        date:
+          type: "string"
+        amount:
+          type: "integer"
+          format: "int64"
+        expense:
+          type: "boolean"
+        budgetId:
+          type: "string"
+        categoryId:
+          type: "string"
+        createdBy:
+          type: "string"
+    BalanceResponse:
+      type: "object"
+      properties:
+        balance:
+          type: "integer"
+          format: "int64"

app/src/test/kotlin/com/wbrawner/twigs/server/RecurringTransactionProcessingJobTest.kt

@@ -3,9 +3,9 @@ package com.wbrawner.twigs.server
 import com.wbrawner.twigs.model.*
 import com.wbrawner.twigs.storage.RecurringTransactionRepository
 import com.wbrawner.twigs.storage.TransactionRepository
-import com.wbrawner.twigs.test.helpers.repository.FakeRecurringTransactionsRepository
+import com.wbrawner.twigs.test.helpers.repository.FakeRecurringTransactionRepository
 import com.wbrawner.twigs.test.helpers.repository.FakeTransactionRepository
-import kotlinx.coroutines.test.runBlockingTest
+import kotlinx.coroutines.test.runTest
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
@@ -21,13 +21,13 @@ class RecurringTransactionProcessingJobTest {
 
     @BeforeEach
     fun setup() {
-        recurringTransactionRepository = FakeRecurringTransactionsRepository()
+        recurringTransactionRepository = FakeRecurringTransactionRepository()
         transactionRepository = FakeTransactionRepository()
         job = RecurringTransactionProcessingJob(recurringTransactionRepository, transactionRepository)
     }
 
     @Test
-    fun `daily transactions are created every day`() = runBlockingTest {
+    fun `daily transactions are created every day`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -49,7 +49,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `daily transactions are only created once per day`() = runBlockingTest {
+    fun `daily transactions are only created once per day`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -71,7 +71,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `daily transactions are created every other day`() = runBlockingTest {
+    fun `daily transactions are created every other day`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -90,7 +90,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `weekly transactions are created every thursday`() = runBlockingTest {
+    fun `weekly transactions are created every thursday`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -113,7 +113,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `weekly transactions are created every third thursday`() = runBlockingTest {
+    fun `weekly transactions are created every third thursday`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -134,7 +134,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `monthly transactions are created every 1st of month`() = runBlockingTest {
+    fun `monthly transactions are created every 1st of month`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -157,7 +157,7 @@ class RecurringTransactionProcessingJobTest {
 
     @Test
     fun `monthly transactions are created every last day of month when greater than max days in month`() =
-        runBlockingTest {
+        runTest {
             val start = Instant.parse("1970-01-01T00:00:00Z")
             recurringTransactionRepository.save(
                 RecurringTransaction(
@@ -180,7 +180,7 @@ class RecurringTransactionProcessingJobTest {
         }
 
     @Test
-    fun `monthly transactions are created every 6 months`() = runBlockingTest {
+    fun `monthly transactions are created every 6 months`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -201,7 +201,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `monthly transactions are created every 2nd tuesday`() = runBlockingTest {
+    fun `monthly transactions are created every 2nd tuesday`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -228,7 +228,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `monthly transactions are created every last friday`() = runBlockingTest {
+    fun `monthly transactions are created every last friday`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
                 RecurringTransaction(
@@ -255,7 +255,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `monthly transactions are created in the new year`() = runBlockingTest {
+    fun `monthly transactions are created in the new year`() = runTest {
         val start = Instant.parse("1971-01-01T00:00:00Z")
         recurringTransactionRepository.save(
                 RecurringTransaction(
@@ -280,7 +280,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `yearly transactions are created every march 31st`() = runBlockingTest {
+    fun `yearly transactions are created every march 31st`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
                 RecurringTransaction(
@@ -303,7 +303,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `yearly transactions are created every other march 31st`() = runBlockingTest {
+    fun `yearly transactions are created every other march 31st`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(
@@ -324,7 +324,7 @@ class RecurringTransactionProcessingJobTest {
     }
 
     @Test
-    fun `yearly transactions are created every february 29th`() = runBlockingTest {
+    fun `yearly transactions are created every february 29th`() = runTest {
         val start = Instant.parse("1970-01-01T00:00:00Z")
         recurringTransactionRepository.save(
             RecurringTransaction(

app/src/test/kotlin/com/wbrawner/twigs/server/api/ApiTest.kt

@@ -0,0 +1,82 @@
+package com.wbrawner.twigs.server.api
+
+import com.wbrawner.twigs.server.moduleWithDependencies
+import com.wbrawner.twigs.service.budget.DefaultBudgetService
+import com.wbrawner.twigs.service.category.DefaultCategoryService
+import com.wbrawner.twigs.service.recurringtransaction.DefaultRecurringTransactionService
+import com.wbrawner.twigs.service.transaction.DefaultTransactionService
+import com.wbrawner.twigs.service.user.DefaultUserService
+import com.wbrawner.twigs.test.helpers.FakeEmailService
+import com.wbrawner.twigs.test.helpers.repository.*
+import io.ktor.client.*
+import io.ktor.client.plugins.contentnegotiation.*
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.testing.*
+import kotlinx.serialization.json.Json
+import org.junit.jupiter.api.BeforeEach
+
+open class ApiTest {
+    lateinit var budgetRepository: FakeBudgetRepository
+    lateinit var categoryRepository: FakeCategoryRepository
+    lateinit var emailService: FakeEmailService
+    lateinit var metadataRepository: FakeMetadataRepository
+    lateinit var passwordResetRepository: FakePasswordResetRepository
+    lateinit var permissionRepository: FakePermissionRepository
+    lateinit var recurringTransactionRepository: FakeRecurringTransactionRepository
+    lateinit var sessionRepository: FakeSessionRepository
+    lateinit var transactionRepository: FakeTransactionRepository
+    lateinit var userRepository: FakeUserRepository
+
+    @BeforeEach
+    fun setup() {
+        budgetRepository = FakeBudgetRepository()
+        categoryRepository = FakeCategoryRepository()
+        emailService = FakeEmailService()
+        metadataRepository = FakeMetadataRepository()
+        passwordResetRepository = FakePasswordResetRepository()
+        permissionRepository = FakePermissionRepository()
+        recurringTransactionRepository = FakeRecurringTransactionRepository()
+        sessionRepository = FakeSessionRepository()
+        transactionRepository = FakeTransactionRepository()
+        userRepository = FakeUserRepository()
+    }
+
+    fun apiTest(test: suspend ApiTest.(client: HttpClient) -> Unit) = testApplication {
+        application {
+            moduleWithDependencies(
+                budgetService = DefaultBudgetService(budgetRepository, permissionRepository),
+                categoryService = DefaultCategoryService(categoryRepository, permissionRepository),
+                recurringTransactionService = DefaultRecurringTransactionService(
+                    recurringTransactionRepository,
+                    permissionRepository
+                ),
+                transactionService = DefaultTransactionService(
+                    transactionRepository,
+                    categoryRepository,
+                    permissionRepository
+                ),
+                userService = DefaultUserService(
+                    emailService,
+                    passwordResetRepository,
+                    permissionRepository,
+                    sessionRepository,
+                    userRepository,
+                    { it }
+                ),
+                jobs = listOf(),
+                sessionValidator = {
+                    sessionRepository.findAll(it.token).firstOrNull()
+                }
+            )
+        }
+        val client = createClient {
+            install(ContentNegotiation) {
+                json(json = Json {
+                    encodeDefaults = true
+                    explicitNulls = false
+                })
+            }
+        }
+        test(client)
+    }
+}

app/src/test/kotlin/com/wbrawner/twigs/server/api/BudgetRouteTest.kt

@@ -0,0 +1,419 @@
+package com.wbrawner.twigs.server.api
+
+import com.wbrawner.twigs.model.*
+import com.wbrawner.twigs.service.budget.BudgetRequest
+import com.wbrawner.twigs.service.budget.BudgetResponse
+import com.wbrawner.twigs.service.user.UserPermissionRequest
+import com.wbrawner.twigs.service.user.UserPermissionResponse
+import io.ktor.client.call.*
+import io.ktor.client.request.*
+import io.ktor.http.*
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+class BudgetRouteTest : ApiTest() {
+
+    @Test
+    fun `fetching budgets requires authentication`() = apiTest { client ->
+        val response = client.get("/api/budgets")
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+    }
+
+    @Test
+    fun `fetching budgets returns empty list when there are no budgets`() = apiTest { client ->
+        val session = Session()
+        sessionRepository.save(session)
+        val response = client.get("/api/budgets") {
+            header("Authorization", "Bearer ${session.token}")
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        assertEquals(0, response.body<List<BudgetResponse>>().size)
+    }
+
+    @Test
+    fun `fetching budgets only returns budgets for current user`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val currentUserBudget = budgetRepository.save(Budget(name = "Test User's Budget"))
+        val otherUserBudget = budgetRepository.save(Budget(name = "Other User's Budget"))
+        permissionRepository.save(
+            UserPermission(
+                budgetId = currentUserBudget.id,
+                userId = users[0].id,
+                Permission.OWNER
+            )
+        )
+        permissionRepository.save(UserPermission(budgetId = otherUserBudget.id, userId = users[1].id, Permission.OWNER))
+        val response = client.get("/api/budgets") {
+            header("Authorization", "Bearer ${session.token}")
+        }
+        val returnedBudgets = response.body<List<BudgetResponse>>()
+        assertEquals(HttpStatusCode.OK, response.status)
+        assertEquals(1, returnedBudgets.size)
+        assertEquals(currentUserBudget.id, returnedBudgets.first().id)
+    }
+
+    @Test
+    fun `creating budgets requires authentication`() = apiTest { client ->
+        val request = BudgetRequest("Test Budget", "A budget for testing")
+        val response = client.post("/api/budgets") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+    }
+
+    @Test
+    fun `newly created budgets are saved`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermissionRequest(users[0].id, Permission.OWNER),
+            UserPermissionRequest(users[1].id, Permission.READ),
+        )
+        val request = BudgetRequest("Test Budget", "A budget for testing", permissions)
+        val response = client.post("/api/budgets") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val responseBody: BudgetResponse = response.body()
+        assert(responseBody.id.isNotEmpty())
+        assertEquals("Test Budget", responseBody.name)
+        assertEquals("A budget for testing", responseBody.description)
+        assertEquals(2, responseBody.users.size)
+        assert(responseBody.users.containsAll(permissions.map { UserPermissionResponse(it.user, it.permission) }))
+    }
+
+    @Test
+    fun `newly created budgets include current user as owner if omitted`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermissionRequest(users[1].id, Permission.OWNER),
+        )
+        val request = BudgetRequest("Test Budget", "A budget for testing", permissions)
+        val response = client.post("/api/budgets") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val responseBody: BudgetResponse = response.body()
+        assert(responseBody.id.isNotEmpty())
+        assertEquals("Test Budget", responseBody.name)
+        assertEquals("A budget for testing", responseBody.description)
+        assertEquals(2, responseBody.users.size)
+        val expectedPermissions = listOf(
+            UserPermissionResponse(users[0].id, Permission.OWNER),
+            UserPermissionResponse(users[1].id, Permission.OWNER),
+        )
+        assert(responseBody.users.containsAll(expectedPermissions))
+    }
+
+    @Test
+    fun `updating budgets requires authentication`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val request = BudgetRequest("Update Budget", "A budget for testing")
+        val response = client.put("/api/budgets/${existingBudget.id}") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+    }
+
+    @Test
+    fun `updating budgets returns forbidden for users with read only access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.READ),
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val request = BudgetRequest("Update Budget", "A budget for testing")
+        val response = client.put("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Forbidden, response.status)
+    }
+
+    @Test
+    fun `updating budgets returns forbidden for users with write only access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.WRITE),
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val request = BudgetRequest("Update Budget", "A budget for testing")
+        val response = client.put("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Forbidden, response.status)
+    }
+
+    @Test
+    fun `updating budgets returns success for users with manage access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.MANAGE),
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val request = BudgetRequest("Update Budget", "An update budget for testing")
+        val response = client.put("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val updatedBudget: BudgetResponse = response.body()
+        assertEquals(request.name, updatedBudget.name)
+        assertEquals(request.description, updatedBudget.description)
+        val expectedUsers = permissions.map { UserPermissionResponse(it.userId, it.permission) }
+        val updatedUsers = updatedBudget.users
+        assertEquals(expectedUsers, updatedUsers)
+    }
+
+    @Test
+    fun `updating budgets returns forbidden for users with no access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val request = BudgetRequest("Update Budget", "An update budget for testing")
+        val response = client.put("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.NotFound, response.status)
+    }
+
+    @Test
+    fun `updating non-existent budgets returns not found`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val request = BudgetRequest("Update Budget", "An update budget for testing")
+        val response = client.put("/api/budgets/random-budget-id") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.NotFound, response.status)
+    }
+
+    @Test
+    fun `updating budgets returns forbidden for users with manage access attempting to remove owner`() =
+        apiTest { client ->
+            val users = listOf(
+                User(name = "testuser", password = "testpassword"),
+                User(name = "otheruser", password = "otherpassword"),
+            )
+            users.forEach { userRepository.save(it) }
+            val existingBudget =
+                budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+            val session = Session(userId = users.first().id)
+            sessionRepository.save(session)
+            val permissions = setOf(
+                UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.MANAGE),
+                UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+            )
+            permissions.forEach {
+                permissionRepository.save(it)
+            }
+            val request = BudgetRequest(
+                "Update Budget",
+                "An update budget for testing",
+                setOf(
+                    UserPermissionRequest(users[0].id, Permission.OWNER),
+                    UserPermissionRequest(users[0].id, Permission.MANAGE),
+                )
+            )
+            val response = client.put("/api/budgets/${existingBudget.id}") {
+                header("Authorization", "Bearer ${session.token}")
+                header("Content-Type", "application/json")
+                setBody(request)
+            }
+            assertEquals(HttpStatusCode.Forbidden, response.status)
+        }
+
+    @Test
+    fun `deleting budgets requires authentication`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val request = BudgetRequest("Update Budget", "A budget for testing")
+        val response = client.put("/api/budgets/${existingBudget.id}") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+    }
+
+    @Test
+    fun `deleting budgets returns forbidden for users with read only access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.READ),
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val response = client.delete("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+        }
+        assertEquals(HttpStatusCode.Forbidden, response.status)
+    }
+
+    @Test
+    fun `deleting budgets returns forbidden for users with write only access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.WRITE),
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val response = client.delete("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+        }
+        assertEquals(HttpStatusCode.Forbidden, response.status)
+    }
+
+    @Test
+    fun `deleting budgets returns forbidden for users with manage access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.MANAGE),
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val response = client.delete("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+        }
+        assertEquals(HttpStatusCode.Forbidden, response.status)
+    }
+
+    @Test
+    fun `deleting budgets returns success for users with owner access`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val existingBudget = budgetRepository.save(Budget(name = "Test Budget", description = "A budget for testing"))
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val permissions = setOf(
+            UserPermission(budgetId = existingBudget.id, userId = users[0].id, Permission.OWNER),
+            UserPermission(budgetId = existingBudget.id, userId = users[1].id, Permission.OWNER),
+        )
+        permissions.forEach {
+            permissionRepository.save(it)
+        }
+        val response = client.delete("/api/budgets/${existingBudget.id}") {
+            header("Authorization", "Bearer ${session.token}")
+            header("Content-Type", "application/json")
+        }
+        assertEquals(HttpStatusCode.NoContent, response.status)
+    }
+}

app/src/test/kotlin/com/wbrawner/twigs/server/api/PasswordResetRouteTest.kt

@@ -0,0 +1,92 @@
+package com.wbrawner.twigs.server.api
+
+import com.wbrawner.twigs.model.PasswordResetToken
+import com.wbrawner.twigs.randomString
+import com.wbrawner.twigs.service.ErrorResponse
+import com.wbrawner.twigs.service.user.PasswordResetRequest
+import com.wbrawner.twigs.service.user.ResetPasswordRequest
+import com.wbrawner.twigs.test.helpers.repository.FakeUserRepository.Companion.TEST_USER
+import io.ktor.client.call.*
+import io.ktor.client.request.*
+import io.ktor.http.*
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import java.time.Instant
+import java.util.*
+
+class PasswordResetRouteTest : ApiTest() {
+    @Test
+    fun `reset password with invalid username returns 202`() = apiTest { client ->
+        val request = ResetPasswordRequest(username = "invaliduser")
+        val response = client.post("/api/users/resetpassword") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Accepted, response.status)
+        assert(emailService.emails.isEmpty())
+    }
+
+    @Test
+    fun `reset password with valid username returns 202`() = apiTest { client ->
+        val request = ResetPasswordRequest(username = "testuser")
+        val response = client.post("/api/users/resetpassword") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Accepted, response.status)
+        assertEquals(1, emailService.emails.size)
+        val email = emailService.emails.first()
+        assertEquals(TEST_USER.email, email.to)
+        assertEquals(1, passwordResetRepository.entities.size)
+        val passwordReset = passwordResetRepository.entities.first()
+        assertEquals(TEST_USER.id, passwordReset.userId)
+    }
+
+    @Test
+    fun `password reset with invalid token returns 401`() = apiTest { client ->
+        val request = PasswordResetRequest(token = randomString(), password = "newpass")
+        val response = client.put("/api/users/resetpassword") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+        val error = response.body<ErrorResponse>()
+        assertEquals("Invalid token", error.message)
+    }
+
+    @Test
+    fun `password reset with expired token returns 401`() = apiTest { client ->
+        val token = passwordResetRepository.save(PasswordResetToken(expiration = twoWeeksAgo))
+        val request = PasswordResetRequest(token = token.id, password = "newpass")
+        val response = client.put("/api/users/resetpassword") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+        val error = response.body<ErrorResponse>()
+        assertEquals("Token expired", error.message)
+    }
+
+    @Test
+    fun `password reset with valid token returns 204`() = apiTest { client ->
+        val token =
+            passwordResetRepository.save(PasswordResetToken(userId = userRepository.findAll("testuser").first().id))
+        val request = PasswordResetRequest(token = token.id, password = "newpass")
+        val response = client.put("/api/users/resetpassword") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.NoContent, response.status)
+        assertEquals(
+            "newpass",
+            userRepository.findAll(TEST_USER.name).first().password
+        )
+        assert(passwordResetRepository.entities.isEmpty())
+    }
+}
+
+private val twoWeeksAgo: Instant
+    get() = GregorianCalendar(TimeZone.getTimeZone("UTC")).run {
+        add(Calendar.DATE, -14)
+        toInstant()
+    }

app/src/test/kotlin/com/wbrawner/twigs/server/api/UserRouteTest.kt

@@ -0,0 +1,249 @@
+package com.wbrawner.twigs.server.api
+
+import com.wbrawner.twigs.model.Session
+import com.wbrawner.twigs.model.User
+import com.wbrawner.twigs.service.ErrorResponse
+import com.wbrawner.twigs.service.user.*
+import com.wbrawner.twigs.test.helpers.repository.FakeUserRepository.Companion.OTHER_USER
+import com.wbrawner.twigs.test.helpers.repository.FakeUserRepository.Companion.TEST_USER
+import io.ktor.client.call.*
+import io.ktor.client.request.*
+import io.ktor.http.*
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Test
+
+class UserRouteTest : ApiTest() {
+    @Test
+    fun `login with invalid username returns 401`() = apiTest { client ->
+        val request = LoginRequest("invalid", "pass")
+        val response = client.post("/api/users/login") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("Invalid credentials", errorBody.message)
+    }
+
+    @Test
+    fun `login with empty username returns 401`() = apiTest { client ->
+        val request = LoginRequest("", "pass")
+        val response = client.post("/api/users/login") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("Invalid credentials", errorBody.message)
+    }
+
+    @Test
+    fun `login with invalid password returns 401`() = apiTest { client ->
+        val request = LoginRequest(TEST_USER.name, "pass")
+        val response = client.post("/api/users/login") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("Invalid credentials", errorBody.message)
+    }
+
+    @Test
+    fun `login with empty password returns 401`() = apiTest { client ->
+        val request = LoginRequest(TEST_USER.name, "")
+        val response = client.post("/api/users/login") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("Invalid credentials", errorBody.message)
+    }
+
+    @Test
+    fun `login with valid username and password returns 200`() = apiTest { client ->
+        val request = LoginRequest(TEST_USER.name, TEST_USER.password)
+        val response = client.post("/api/users/login") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val session = response.body<SessionResponse>()
+        assertEquals(TEST_USER.id, session.userId)
+        assert(session.token.isNotBlank())
+    }
+
+    @Test
+    fun `login with valid email and password returns 200`() = apiTest { client ->
+        val request = LoginRequest(requireNotNull(TEST_USER.email), TEST_USER.password)
+        val response = client.post("/api/users/login") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val session = response.body<SessionResponse>()
+        assertEquals(TEST_USER.id, session.userId)
+        assert(session.token.isNotBlank())
+    }
+
+    @Test
+    fun `register with null username returns 400`() = apiTest { client ->
+        val request = UserRequest(password = "")
+        val response = client.post("/api/users/register") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("username must not be null or blank", errorBody.message)
+    }
+
+    @Test
+    fun `register with empty username returns 400`() = apiTest { client ->
+        val request = UserRequest(username = "", password = "")
+        val response = client.post("/api/users/register") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("username must not be null or blank", errorBody.message)
+    }
+
+    @Test
+    fun `register with null password returns 400`() = apiTest { client ->
+        val request = UserRequest(username = "test@example.com")
+        val response = client.post("/api/users/register") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("password must not be null or blank", errorBody.message)
+    }
+
+    @Test
+    fun `register with empty password returns 400`() = apiTest { client ->
+        val request = UserRequest(username = "test@example.com", password = "")
+        val response = client.post("/api/users/register") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("password must not be null or blank", errorBody.message)
+    }
+
+    @Test
+    fun `register with existing username returns 400`() = apiTest { client ->
+        val request = UserRequest(username = TEST_USER.name, password = "password")
+        val response = client.post("/api/users/register") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("username or email already taken", errorBody.message)
+    }
+
+    @Test
+    fun `register with existing email returns 400`() = apiTest { client ->
+        val request = UserRequest(username = "testuser2", email = TEST_USER.email, password = "password")
+        val response = client.post("/api/users/register") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+        val errorBody = response.body<ErrorResponse>()
+        assertEquals("username or email already taken", errorBody.message)
+    }
+
+    @Test
+    fun `register with valid username and password returns 200`() = apiTest { client ->
+        val initialUserCount = userRepository.entities.size
+        val request = UserRequest("newuser", "newpass")
+        val response = client.post("/api/users/register") {
+            header("Content-Type", "application/json")
+            setBody(request)
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val userResponse = response.body<UserResponse>()
+        assert(userResponse.id.isNotBlank())
+        assertEquals(request.username, userResponse.username)
+        assertEquals(null, userResponse.email)
+        assertEquals(initialUserCount + 1, userRepository.entities.size)
+        val savedUser: User? = userRepository.findAll("newuser").firstOrNull()
+        assertNotNull(savedUser)
+        requireNotNull(savedUser)
+        assertEquals(userResponse.id, savedUser.id)
+        assertEquals(request.username, savedUser.name)
+        assertEquals(null, savedUser.email)
+        assertEquals("newpass", savedUser.password)
+    }
+
+    @Test
+    fun `get users requires authentication`() = apiTest { client ->
+        val response = client.get("/api/users")
+        assertEquals(HttpStatusCode.Unauthorized, response.status)
+    }
+
+    @Test
+    fun `get users with empty query returns 400`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val response = client.get("/api/users?query=") {
+            header("Authorization", "Bearer ${session.token}")
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+        val error: ErrorResponse = response.body()
+        assertEquals("query cannot be empty", error.message)
+    }
+
+    @Test
+    fun `get users with valid query but no matches returns empty list`() = apiTest { client ->
+        val users = listOf(
+            User(name = "testuser", password = "testpassword"),
+            User(name = "otheruser", password = "otherpassword"),
+        )
+        users.forEach { userRepository.save(it) }
+        val session = Session(userId = users.first().id)
+        sessionRepository.save(session)
+        val response = client.get("/api/users?query=something") {
+            header("Authorization", "Bearer ${session.token}")
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val userQueryResponse: List<UserResponse> = response.body()
+        assertEquals(0, userQueryResponse.size)
+    }
+
+    @Test
+    fun `get users with valid query and matches returns list`() = apiTest { client ->
+        val session = Session(userId = TEST_USER.id)
+        sessionRepository.save(session)
+        val response = client.get("/api/users?query=user") {
+            header("Authorization", "Bearer ${session.token}")
+        }
+        assertEquals(HttpStatusCode.OK, response.status)
+        val userQueryResponse: List<UserResponse> = response.body()
+        assertEquals(2, userQueryResponse.size)
+        assertEquals(TEST_USER.asResponse(), userQueryResponse[0])
+        assertEquals(OTHER_USER.asResponse(), userQueryResponse[1])
+    }
+
+    @Test
+    fun `get users with empty budgetId returns 400`() = apiTest { client ->
+        val session = Session(userId = TEST_USER.id)
+        sessionRepository.save(session)
+        val response = client.get("/api/users?budgetId=") {
+            header("Authorization", "Bearer ${session.token}")
+        }
+        assertEquals(HttpStatusCode.BadRequest, response.status)
+    }
+}

build.gradle.kts

@@ -2,23 +2,24 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import java.net.URI
 
 buildscript {
-    val kotlinVersion: String by extra("1.6.10")
-    val ktorVersion: String by extra("1.6.6")
     repositories {
         mavenLocal()
         mavenCentral()
     }
 
     dependencies {
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
+        classpath(libs.kotlin.gradle)
     }
 }
 
 plugins {
     java
-    kotlin("jvm") version "1.5.20"
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.kotlin.serialization) apply false
 }
 
+val javaVersion = JavaVersion.VERSION_17
+
 allprojects {
     repositories {
         mavenLocal()
@@ -29,7 +30,11 @@ allprojects {
     }
     group = "com.wbrawner"
     version = "0.0.1-SNAPSHOT"
+    tasks.withType<JavaCompile> {
+        sourceCompatibility = javaVersion.majorVersion
+        targetCompatibility = javaVersion.majorVersion
+    }
     tasks.withType<KotlinCompile> {
-        kotlinOptions.jvmTarget = "16"
+        kotlinOptions.jvmTarget = javaVersion.majorVersion
     }
 }

captain-definition

@@ -1,4 +0,0 @@
- {
-  "schemaVersion": 2,
-  "dockerfilePath": "./Dockerfile"
- }

core/build.gradle.kts

@@ -1,16 +1,13 @@
 plugins {
-    kotlin("jvm")
     `java-library`
+    kotlin("jvm")
 }
 
-val ktorVersion: String by rootProject.extra
-
 dependencies {
     implementation(kotlin("stdlib"))
-    api("io.ktor:ktor-auth:$ktorVersion")
-    api("at.favre.lib:bcrypt:0.9.0")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+    api(libs.ktor.server.auth)
+    testImplementation(libs.junit.jupiter.api)
+    testRuntimeOnly(libs.junit.jupiter.engine)
 }
 
 tasks.getByName<Test>("test") {

core/src/main/kotlin/com/wbrawner/twigs/EmailService.kt

@@ -0,0 +1,7 @@
+package com.wbrawner.twigs
+
+import com.wbrawner.twigs.model.PasswordResetToken
+
+interface EmailService {
+    fun sendPasswordResetEmail(token: PasswordResetToken, to: String)
+}

core/src/main/kotlin/com/wbrawner/twigs/Utils.kt

@@ -1,8 +1,8 @@
 package com.wbrawner.twigs
 
-import at.favre.lib.crypto.bcrypt.BCrypt
 import com.wbrawner.twigs.model.Frequency
 import java.time.Instant
+import java.time.format.DateTimeParseException
 import java.util.*
 
 private val CALENDAR_FIELDS = intArrayOf(
@@ -35,6 +35,12 @@ val twoWeeksFromNow: Instant
         toInstant()
     }
 
+val tomorrow: Instant
+    get() = GregorianCalendar(TimeZone.getTimeZone("UTC")).run {
+        add(Calendar.DATE, 1)
+        toInstant()
+    }
+
 private const val CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
 
 fun randomString(length: Int = 32): String {
@@ -45,9 +51,12 @@ fun randomString(length: Int = 32): String {
     return id.toString()
 }
 
-lateinit var salt: String
-fun String.hash(): String = String(BCrypt.withDefaults().hash(10, salt.toByteArray(), this.toByteArray()))
-
 fun String.toInstant(): Instant = Instant.parse(this)
 
+fun String.toInstantOrNull(): Instant? = try {
+    Instant.parse(this)
+} catch (e: DateTimeParseException) {
+    null
+}
+
 fun String.asFrequency(): Frequency = Frequency.parse(this)

core/src/main/kotlin/com/wbrawner/twigs/model/PasswordResetToken.kt

@@ -0,0 +1,12 @@
+package com.wbrawner.twigs.model
+
+import com.wbrawner.twigs.Identifiable
+import com.wbrawner.twigs.randomString
+import com.wbrawner.twigs.tomorrow
+import java.time.Instant
+
+data class PasswordResetToken(
+    override val id: String = randomString(),
+    val userId: String = "",
+    var expiration: Instant = tomorrow
+) : Identifiable

core/src/main/kotlin/com/wbrawner/twigs/model/Session.kt

@@ -3,12 +3,23 @@ package com.wbrawner.twigs.model
 import com.wbrawner.twigs.Identifiable
 import com.wbrawner.twigs.randomString
 import com.wbrawner.twigs.twoWeeksFromNow
-import io.ktor.auth.*
+import io.ktor.server.auth.*
 import java.time.Instant
 
-data class Session(
+open class Session(
     override val id: String = randomString(),
     val userId: String = "",
-    val token: String = randomString(255),
-    var expiration: Instant = twoWeeksFromNow
-) : Principal, Identifiable
+    open val token: String = randomString(255),
+    val expiration: Instant = twoWeeksFromNow
+) : Principal, Identifiable {
+    fun updateExpiration(newExpiration: Instant) = Session(
+        id = id,
+        userId = userId,
+        token = token,
+        expiration = newExpiration
+    )
+}
+
+data class HeaderSession(override val token: String) : Session(token = token)
+
+data class CookieSession(override val token: String) : Session(token = token)

core/src/main/kotlin/com/wbrawner/twigs/model/User.kt

@@ -2,7 +2,7 @@ package com.wbrawner.twigs.model
 
 import com.wbrawner.twigs.Identifiable
 import com.wbrawner.twigs.randomString
-import io.ktor.auth.*
+import io.ktor.server.auth.*
 
 data class User(
     override val id: String = randomString(),

db/build.gradle.kts

@@ -8,11 +8,12 @@ val ktorVersion: String by rootProject.extra
 dependencies {
     implementation(kotlin("stdlib"))
     api(project(":storage"))
-    implementation("org.postgresql:postgresql:42.3.1")
-    api("com.zaxxer:HikariCP:5.0.0")
-    implementation("ch.qos.logback:logback-classic:1.2.8")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+    runtimeOnly(libs.postgres)
+    runtimeOnly(libs.sqlite)
+    api(libs.hikari)
+    implementation(libs.logback)
+    testImplementation(libs.junit.jupiter.api)
+    testRuntimeOnly(libs.junit.jupiter.engine)
 }
 
 tasks.getByName<Test>("test") {

db/src/main/kotlin/com/wbrawner/twigs/db/JdbcPasswordResetRepository.kt

@@ -0,0 +1,30 @@
+package com.wbrawner.twigs.db
+
+import com.wbrawner.twigs.model.PasswordResetToken
+import com.wbrawner.twigs.storage.PasswordResetRepository
+import java.sql.ResultSet
+import javax.sql.DataSource
+
+class JdbcPasswordResetRepository(dataSource: DataSource) :
+    JdbcRepository<PasswordResetToken, JdbcPasswordResetRepository.Fields>(dataSource),
+    PasswordResetRepository {
+    override val tableName: String = TABLE_USER
+    override val fields: Map<Fields, (PasswordResetToken) -> Any?> = Fields.values().associateWith { it.entityField }
+    override val conflictFields: Collection<String> = listOf(ID)
+
+    override fun ResultSet.toEntity(): PasswordResetToken = PasswordResetToken(
+        id = getString(ID),
+        userId = getString(Fields.USER_ID.name.lowercase()),
+        expiration = getInstant(Fields.EXPIRATION.name.lowercase())!!
+    )
+
+    enum class Fields(val entityField: (PasswordResetToken) -> Any?) {
+        USER_ID({ it.userId }),
+        EXPIRATION({ it.expiration })
+    }
+
+    companion object {
+        const val TABLE_USER = "password_reset_tokens"
+    }
+}
+

db/src/main/kotlin/com/wbrawner/twigs/db/JdbcPermissionRepository.kt

@@ -13,7 +13,7 @@ class JdbcPermissionRepository(dataSource: DataSource) :
     override val conflictFields: Collection<String> =
         listOf(Fields.USER_ID.name.lowercase(), Fields.BUDGET_ID.name.lowercase())
 
-    override fun findAll(budgetIds: List<String>?, userId: String?): List<UserPermission> =
+    override suspend fun findAll(budgetIds: List<String>?, userId: String?): List<UserPermission> =
         dataSource.connection.use { conn ->
             if (budgetIds.isNullOrEmpty() && userId.isNullOrBlank()) {
                 throw Error("budgetIds or userId must be provided")
@@ -32,6 +32,10 @@ class JdbcPermissionRepository(dataSource: DataSource) :
             conn.executeQuery(sql.toString(), params)
         }
 
+    override suspend fun findAll(ids: List<String>?): List<UserPermission> {
+        throw UnsupportedOperationException("UserPermission requires a userId and budgetId")
+    }
+
     override fun ResultSet.toEntity(): UserPermission = UserPermission(
         budgetId = getString(Fields.BUDGET_ID.name.lowercase()),
         userId = getString(Fields.USER_ID.name.lowercase()),

db/src/main/kotlin/com/wbrawner/twigs/db/JdbcUserRepository.kt

@@ -25,11 +25,15 @@ class JdbcUserRepository(dataSource: DataSource) : JdbcRepository<User, JdbcUser
         )
     }
 
-    override fun findAll(nameOrEmail: String, password: String): List<User> = dataSource.connection.use { conn ->
-        conn.executeQuery(
-            "SELECT * FROM $tableName WHERE (${Fields.USERNAME.name.lowercase()} = ? OR ${Fields.EMAIL.name.lowercase()} = ?) AND ${Fields.PASSWORD.name.lowercase()} = ?",
-            listOf(nameOrEmail, nameOrEmail, password)
-        )
+    override fun findAll(nameOrEmail: String, password: String?): List<User> = dataSource.connection.use { conn ->
+        var sql =
+            "SELECT * FROM $tableName WHERE (${Fields.USERNAME.name.lowercase()} = ? OR ${Fields.EMAIL.name.lowercase()} = ?)"
+        val params = mutableListOf(nameOrEmail, nameOrEmail)
+        password?.let {
+            sql += " AND ${Fields.PASSWORD.name.lowercase()} = ?"
+            params.add(it)
+        }
+        conn.executeQuery(sql, params)
     }
 
     enum class Fields(val entityField: (User) -> Any?) {

db/src/main/kotlin/com/wbrawner/twigs/db/MetadataRepository.kt

@@ -1,20 +1,26 @@
 package com.wbrawner.twigs.db
 
+import com.wbrawner.twigs.storage.Repository
 import java.sql.ResultSet
 import java.sql.SQLException
 import javax.sql.DataSource
 
-class MetadataRepository(dataSource: DataSource) :
-    JdbcRepository<DatabaseMetadata, MetadataRepository.Fields>(dataSource) {
+interface MetadataRepository : Repository<DatabaseMetadata> {
+    fun runMigration(toVersion: Int)
+}
+
+class JdbcMetadataRepository(dataSource: DataSource) :
+    JdbcRepository<DatabaseMetadata, JdbcMetadataRepository.Fields>(dataSource), MetadataRepository {
     override val tableName: String = TABLE_METADATA
     override val fields: Map<Fields, (DatabaseMetadata) -> Any?> = Fields.values().associateWith { it.entityField }
     override val conflictFields: Collection<String> = listOf()
 
-    suspend fun runMigration(toVersion: Int) {
+    override fun runMigration(toVersion: Int) {
         val queries = MetadataRepository::class.java
             .getResource("/sql/$toVersion.sql")
             ?.readText()
             ?.split(";")
+            ?.filterNot { it.isBlank() }
             ?: throw Error("No migration found for version $toVersion")
         dataSource.connection.use { conn ->
             queries.forEach { query ->

db/src/main/resources/sql/3.sql

@@ -0,0 +1,25 @@
+CREATE TABLE IF NOT EXISTS password_reset_tokens
+(
+    id
+    TEXT
+    PRIMARY
+    KEY,
+    user_id
+    TEXT
+    NOT
+    NULL,
+    expiration
+    TIMESTAMP
+    NOT
+    NULL,
+    CONSTRAINT
+    fk_users
+    FOREIGN
+    KEY
+(
+    user_id
+) REFERENCES users
+(
+    id
+) ON DELETE CASCADE
+    );

docker-compose.yml

@@ -9,11 +9,12 @@ services:
       - db
     environment:
       TWIGS_DB_HOST: db
+      TWIGS_DB_TYPE: postgresql
     networks:
       - twigs
 
   db:
-    image: postgres:13
+    image: postgres:17
     ports:
       - "5432:5432"
     environment:

gradle/libs.versions.toml

@@ -0,0 +1,55 @@
+[versions]
+bcrypt = "0.10.2"
+hikari = "6.2.1"
+junit = "5.11.3"
+kotlin = "2.0.21"
+kotlinx-coroutines = "1.9.0"
+ktor = "2.3.13"
+logback = "1.5.12"
+mail = "1.6.2"
+postgres = "42.7.4"
+shadow = "8.1.1"
+sqlite = "3.47.0.0"
+
+[libraries]
+bcrypt = { module = "at.favre.lib:bcrypt", version.ref = "bcrypt" }
+hikari = { module = "com.zaxxer:HikariCP", version.ref = "hikari" }
+junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit" }
+junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine" }
+kotlin-gradle = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
+kotlin-reflect = { module = "org.jetbrains.kotlin:kotlin-reflect", version.ref = "kotlin" }
+kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test-junit", version.ref = "kotlin" }
+kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinx-coroutines" }
+kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "kotlinx-coroutines" }
+ktor-client-content-negotiation = { module = "io.ktor:ktor-client-content-negotiation", version.ref = "ktor" }
+ktor-serialization = { module = "io.ktor:ktor-serialization-kotlinx-json", version.ref = "ktor" }
+ktor-server-auth = { module = "io.ktor:ktor-server-auth", version.ref = "ktor" }
+ktor-server-call-logging = { module = "io.ktor:ktor-server-call-logging", version.ref = "ktor" }
+ktor-server-cio = { module = "io.ktor:ktor-server-cio", version.ref = "ktor" }
+ktor-server-content-negotiation = { module = "io.ktor:ktor-server-content-negotiation", version.ref = "ktor" }
+ktor-server-core = { module = "io.ktor:ktor-server-core", version.ref = "ktor" }
+ktor-server-cors = { module = "io.ktor:ktor-server-cors", version.ref = "ktor" }
+ktor-server-forwarded-headers = { module = "io.ktor:ktor-server-forwarded-header", version.ref = "ktor" }
+ktor-server-mustache = { module = "io.ktor:ktor-server-mustache", version.ref = "ktor" }
+ktor-server-sessions = { module = "io.ktor:ktor-server-sessions", version.ref = "ktor" }
+ktor-server-test = { module = "io.ktor:ktor-server-test-host", version.ref = "ktor" }
+logback = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
+mail = { module = "com.sun.mail:javax.mail", version.ref = "mail" }
+postgres = { module = "org.postgresql:postgresql", version.ref = "postgres" }
+sqlite = { module = "org.xerial:sqlite-jdbc", version.ref = "sqlite" }
+
+[bundles]
+ktor-server = [
+    "ktor-server-call-logging",
+    "ktor-server-cio",
+    "ktor-server-content-negotiation",
+    "ktor-server-core",
+    "ktor-server-cors",
+    "ktor-server-forwarded-headers",
+    "ktor-server-sessions"
+]
+
+[plugins]
+kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
+kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
+shadow = { id = "com.github.johnrengelman.shadow", version.ref = "shadow" }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,7 @@
-#Fri Feb 07 18:11:46 CST 2020
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-all.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -1,7 +1,7 @@
-#!/usr/bin/env sh
+#!/bin/sh
 
 #
-# Copyright 2015 the original author or authors.
+# Copyright © 2015-2021 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,80 +15,116 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
-##
-##  Gradle start up script for UN*X
-##
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
 ##############################################################################
 
 # Attempt to set APP_HOME
+
 # Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
 
-APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 
 warn () {
     echo "$*"
-}
+} >&2
 
 die () {
     echo
     echo "$*"
     echo
     exit 1
-}
+} >&2
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
 esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
+
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
     else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -97,87 +133,120 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD="java"
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
-fi
-
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=`expr $i + 1`
-    done
-    case $i in
-        0) set -- ;;
-        1) set -- "$args0" ;;
-        2) set -- "$args0" "$args1" ;;
-        3) set -- "$args0" "$args1" "$args2" ;;
-        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
 fi
 
-# Escape application args
-save () {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=`save "$@"`
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
 
 exec "$JAVACMD" "$@"

gradlew.bat

@@ -1,100 +1,94 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
-@if "%DEBUG%" == "" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto init
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:init
-@rem Get command-line arguments, handling Windows variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
-
-:end
-@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

renovate.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+}

service/.gitignore

@@ -0,0 +1 @@
+build/

service/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    `java-library`
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.kotlin.serialization)
+}
+
+dependencies {
+    implementation(kotlin("stdlib"))
+    api(libs.ktor.server.core)
+    implementation(project(":storage"))
+    api(libs.ktor.serialization)
+    api(libs.kotlinx.coroutines.core)
+    testImplementation(libs.junit.jupiter.api)
+    testRuntimeOnly(libs.junit.jupiter.engine)
+}
+
+tasks.getByName<Test>("test") {
+    useJUnitPlatform()
+}

service/src/main/java/com/wbrawner/twigs/service/ApiUtils.kt

@@ -0,0 +1,59 @@
+package com.wbrawner.twigs.service
+
+import com.wbrawner.twigs.model.Permission
+import com.wbrawner.twigs.model.Session
+import com.wbrawner.twigs.model.UserPermission
+import com.wbrawner.twigs.service.budget.BudgetResponse
+import com.wbrawner.twigs.storage.BudgetRepository
+import com.wbrawner.twigs.storage.PermissionRepository
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.response.*
+import io.ktor.util.pipeline.*
+
+suspend fun PermissionRepository.requirePermission(
+    userId: String,
+    budgetIds: List<String>,
+    permission: Permission
+): List<UserPermission> {
+    val uniqueBudgetIds = budgetIds.toSet()
+    val allPermissions = findAll(budgetIds = uniqueBudgetIds.toList(), userId = userId)
+    if (allPermissions.size != uniqueBudgetIds.size) {
+        throw HttpException(HttpStatusCode.NotFound)
+    } else if (allPermissions.any { !it.permission.isAtLeast(permission) }) {
+        throw HttpException(HttpStatusCode.Forbidden)
+    }
+    return allPermissions
+}
+
+suspend fun PermissionRepository.requirePermission(
+    userId: String,
+    budgetId: String,
+    permission: Permission
+): List<UserPermission> = requirePermission(userId, listOf(budgetId), permission)
+
+suspend fun Pair<BudgetRepository, PermissionRepository>.budgetWithPermission(
+    userId: String,
+    budgetId: String,
+    permission: Permission
+): BudgetResponse {
+    val budget = first.findAll(ids = listOf(budgetId)).firstOrNull() ?: throw HttpException(HttpStatusCode.NotFound)
+    return BudgetResponse(budget, second.requirePermission(userId, budgetId, permission))
+}
+
+fun PipelineContext<Unit, ApplicationCall>.requireSession() = requireNotNull(call.principal<Session>()) {
+    "Session required but was null"
+}
+
+suspend inline fun <reified T : Any> ApplicationCall.respondCatching(block: () -> T) =
+    try {
+        val response = block()
+        if (response is HttpStatusCode) {
+            respond(status = response, message = Unit)
+        } else {
+            respond(HttpStatusCode.OK, response)
+        }
+    } catch (e: HttpException) {
+        respond(e.statusCode, e.toResponse())
+    }

service/src/main/java/com/wbrawner/twigs/service/ErrorResponse.kt

@@ -0,0 +1,18 @@
+package com.wbrawner.twigs.service
+
+import io.ktor.http.*
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class ErrorResponse(val message: String)
+
+class HttpException(
+    val statusCode: HttpStatusCode,
+    override val cause: Throwable? = null,
+    override val message: String? = null
+) : Throwable() {
+    constructor(statusCode: HttpStatusCode) : this(statusCode = statusCode, message = statusCode.description)
+
+    fun toResponse(): ErrorResponse =
+        ErrorResponse(requireNotNull(message) { "Cannot send error to client without message" })
+}

service/src/main/java/com/wbrawner/twigs/service/budget/BudgetApi.kt

@@ -1,9 +1,10 @@
-package com.wbrawner.twigs
+package com.wbrawner.twigs.service.budget
 
 import com.wbrawner.twigs.model.Budget
 import com.wbrawner.twigs.model.UserPermission
+import com.wbrawner.twigs.service.user.UserPermissionRequest
+import com.wbrawner.twigs.service.user.UserPermissionResponse
 import kotlinx.serialization.Serializable
-import java.util.*
 
 @Serializable
 data class BudgetRequest(
@@ -15,12 +16,12 @@ data class BudgetRequest(
 @Serializable
 data class BudgetResponse(
     val id: String,
-    val name: String?,
-    val description: String?,
-    private val users: List<UserPermissionResponse>
+    val name: String? = null,
+    val description: String? = null,
+    val users: List<UserPermissionResponse>
 ) {
     constructor(budget: Budget, users: Iterable<UserPermission>) : this(
-        Objects.requireNonNull<String>(budget.id),
+        requireNotNull(budget.id),
         budget.name,
         budget.description,
         users.map { userPermission: UserPermission ->

service/src/main/java/com/wbrawner/twigs/service/budget/BudgetService.kt

@@ -0,0 +1,130 @@
+package com.wbrawner.twigs.service.budget
+
+import com.wbrawner.twigs.model.Budget
+import com.wbrawner.twigs.model.Permission
+import com.wbrawner.twigs.model.UserPermission
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.budgetWithPermission
+import com.wbrawner.twigs.service.user.UserPermissionRequest
+import com.wbrawner.twigs.storage.BudgetRepository
+import com.wbrawner.twigs.storage.PermissionRepository
+import io.ktor.http.*
+
+interface BudgetService {
+    suspend fun budgetsForUser(userId: String): List<BudgetResponse>
+
+    suspend fun budget(budgetId: String, userId: String): BudgetResponse
+
+    suspend fun save(request: BudgetRequest, userId: String, budgetId: String? = null): BudgetResponse
+
+    suspend fun delete(budgetId: String, userId: String)
+}
+
+class DefaultBudgetService(
+    private val budgetRepository: BudgetRepository,
+    private val permissionRepository: PermissionRepository
+) : BudgetService {
+    private val budgetPermissionRepository = budgetRepository to permissionRepository
+    override suspend fun budgetsForUser(userId: String): List<BudgetResponse> {
+        val budgetIds = permissionRepository.findAll(userId = userId).map { it.budgetId }
+        if (budgetIds.isEmpty()) {
+            return emptyList()
+        }
+        return budgetRepository.findAll(ids = budgetIds).map {
+            BudgetResponse(it, permissionRepository.findAll(budgetIds = listOf(it.id)))
+        }
+    }
+
+    override suspend fun budget(budgetId: String, userId: String): BudgetResponse =
+        budgetPermissionRepository.budgetWithPermission(userId, budgetId, Permission.READ)
+
+    override suspend fun save(request: BudgetRequest, userId: String, budgetId: String?): BudgetResponse {
+        val budget = if (budgetId?.isNotBlank() == true) {
+            budgetPermissionRepository.budgetWithPermission(
+                budgetId = budgetId,
+                userId = userId,
+                permission = Permission.MANAGE
+            ).run {
+                Budget(
+                    id = budgetId,
+                    name = request.name ?: name,
+                    description = request.description ?: description
+                )
+            }
+        } else {
+            if (request.name.isNullOrBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "Name cannot be empty or null")
+            }
+            Budget(
+                name = request.name,
+                description = request.description
+            )
+        }
+        val users = budgetId?.let {
+            // If user is owner, apply changes
+            // If user is manager, make sure they're not changing ownership
+            val oldUsers = permissionRepository.findAll(budgetIds = listOf(budgetId))
+            val oldPermissions = oldUsers.associate { it.userId to it.permission }
+            val currentUserPermission = oldPermissions[userId] ?: throw HttpException(HttpStatusCode.NotFound)
+            val newUsers = request.users?.map { userPermission ->
+                if (userPermission.permission == Permission.OWNER
+                    && oldPermissions[userPermission.user] !== Permission.OWNER
+                    && currentUserPermission != Permission.OWNER
+                ) {
+                    // The user is attempting to add a new owner
+                    throw HttpException(
+                        HttpStatusCode.Forbidden,
+                        message = "You must be an owner to be able to modify other users' ownership"
+                    )
+                }
+                userPermission
+            } ?: return@let oldUsers.map { UserPermissionRequest(it.userId, it.permission) }
+            oldPermissions.filterValues { it == Permission.OWNER }
+                .forEach { (user, permission) ->
+                    if (newUsers.none { it.user == user && it.permission == permission }
+                        && currentUserPermission != Permission.OWNER
+                    ) {
+                        // The user is attempting to remove a previous owner
+                        throw HttpException(
+                            HttpStatusCode.Forbidden,
+                            message = "You must be an owner to be able to modify other users' ownership"
+                        )
+                    }
+                }
+            oldUsers.forEach { oldUserPermission ->
+                if (newUsers.none { it.user == oldUserPermission.userId && it.permission == oldUserPermission.permission }) {
+                    permissionRepository.delete(oldUserPermission)
+                }
+            }
+            newUsers
+        } ?: run {
+            val newUsers = request.users
+                ?.toMutableList()
+                ?: mutableListOf()
+            val currentUserPermission = newUsers.firstOrNull { it.user == userId }
+            if (currentUserPermission == null || currentUserPermission.permission != Permission.OWNER) {
+                newUsers.removeIf { it.user == userId }
+                newUsers.add(UserPermissionRequest(userId, Permission.OWNER))
+            }
+            newUsers
+        }
+        val savedBudget = budgetRepository.save(budget)
+        return BudgetResponse(
+            savedBudget,
+            users.map {
+                permissionRepository.save(
+                    UserPermission(
+                        budgetId = savedBudget.id,
+                        userId = it.user,
+                        permission = it.permission
+                    )
+                )
+            }
+        )
+    }
+
+    override suspend fun delete(budgetId: String, userId: String) {
+        val budgetResponse = budgetPermissionRepository.budgetWithPermission(userId, budgetId, Permission.OWNER)
+        budgetRepository.delete(Budget(budgetResponse.id, budgetResponse.name, budgetResponse.description))
+    }
+}

service/src/main/java/com/wbrawner/twigs/service/category/CategoryApi.kt

@@ -1,4 +1,4 @@
-package com.wbrawner.twigs
+package com.wbrawner.twigs.service.category
 
 import com.wbrawner.twigs.model.Category
 import kotlinx.serialization.Serializable

service/src/main/java/com/wbrawner/twigs/service/category/CategoryService.kt

@@ -0,0 +1,104 @@
+package com.wbrawner.twigs.service.category
+
+import com.wbrawner.twigs.model.Category
+import com.wbrawner.twigs.model.Permission
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.requirePermission
+import com.wbrawner.twigs.storage.CategoryRepository
+import com.wbrawner.twigs.storage.PermissionRepository
+import io.ktor.http.*
+
+interface CategoryService {
+    suspend fun categories(
+        budgetIds: List<String>,
+        userId: String,
+        expense: Boolean? = null,
+        archived: Boolean? = null,
+    ): List<CategoryResponse>
+
+    suspend fun category(categoryId: String, userId: String): CategoryResponse
+
+    suspend fun save(request: CategoryRequest, userId: String, categoryId: String? = null): CategoryResponse
+
+    suspend fun delete(categoryId: String, userId: String)
+}
+
+class DefaultCategoryService(
+    private val categoryRepository: CategoryRepository,
+    private val permissionRepository: PermissionRepository
+) : CategoryService {
+
+    override suspend fun categories(
+        budgetIds: List<String>,
+        userId: String,
+        expense: Boolean?,
+        archived: Boolean?,
+    ): List<CategoryResponse> {
+        val validBudgetIds = permissionRepository.findAll(
+            budgetIds = budgetIds,
+            userId = userId
+        ).map { it.budgetId }
+        if (validBudgetIds.isEmpty()) {
+            return emptyList()
+        }
+        return categoryRepository.findAll(
+            budgetIds = budgetIds,
+            expense = expense,
+            archived = archived
+        ).map { it.asResponse() }
+    }
+
+    override suspend fun category(categoryId: String, userId: String): CategoryResponse {
+        val budgetIds = permissionRepository.findAll(userId = userId).map { it.budgetId }
+        if (budgetIds.isEmpty()) {
+            throw HttpException(HttpStatusCode.NotFound)
+        }
+        return categoryRepository.findAll(
+            ids = listOf(categoryId),
+            budgetIds = budgetIds
+        )
+            .map { it.asResponse() }
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.NotFound)
+    }
+
+    override suspend fun save(request: CategoryRequest, userId: String, categoryId: String?): CategoryResponse {
+        val category = categoryId?.let {
+            categoryRepository.findAll(ids = listOf(categoryId)).firstOrNull()
+                ?: throw HttpException(HttpStatusCode.NotFound)
+        } ?: run {
+            if (request.title.isNullOrBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "title cannot be null or empty")
+            }
+            if (request.budgetId.isNullOrBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "budgetId cannot be null or empty")
+            }
+            Category(
+                title = request.title,
+                description = request.description,
+                amount = request.amount ?: 0L,
+                expense = request.expense ?: true,
+                budgetId = request.budgetId
+            )
+        }
+        permissionRepository.requirePermission(userId, category.budgetId, Permission.WRITE)
+        return categoryRepository.save(
+            category.copy(
+                title = request.title?.ifBlank { category.title } ?: category.title,
+                description = request.description ?: category.description,
+                amount = request.amount ?: category.amount,
+                expense = request.expense ?: category.expense,
+                archived = request.archived ?: category.archived,
+                budgetId = request.budgetId?.ifBlank { category.budgetId } ?: category.budgetId
+            )
+        ).asResponse()
+    }
+
+    override suspend fun delete(categoryId: String, userId: String) {
+        val category = categoryRepository.findAll(ids = listOf(categoryId))
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.NotFound)
+        permissionRepository.requirePermission(userId, category.budgetId, Permission.WRITE)
+        categoryRepository.delete(category)
+    }
+}

service/src/main/java/com/wbrawner/twigs/service/recurringtransaction/RecurringTransactionApi.kt

@@ -1,7 +1,8 @@
-package com.wbrawner.twigs
+package com.wbrawner.twigs.service.recurringtransaction
 
 import com.wbrawner.twigs.model.RecurringTransaction
 import kotlinx.serialization.Serializable
+import java.time.temporal.ChronoUnit
 
 @Serializable
 data class RecurringTransactionRequest(
@@ -23,7 +24,7 @@ data class RecurringTransactionResponse(
     val description: String?,
     val frequency: String,
     val start: String,
-    val finish: String? = null,
+    val finish: String?,
     val amount: Long?,
     val expense: Boolean?,
     val budgetId: String,
@@ -36,8 +37,8 @@ fun RecurringTransaction.asResponse(): RecurringTransactionResponse = RecurringT
     title = title,
     description = description,
     frequency = frequency.toString(),
-    start = start.toString(),
-    finish = finish.toString(),
+    start = start.truncatedTo(ChronoUnit.SECONDS).toString(),
+    finish = finish?.truncatedTo(ChronoUnit.SECONDS)?.toString(),
     amount = amount,
     expense = expense,
     budgetId = budgetId,

service/src/main/java/com/wbrawner/twigs/service/recurringtransaction/RecurringTransactionService.kt

@@ -0,0 +1,110 @@
+package com.wbrawner.twigs.service.recurringtransaction
+
+import com.wbrawner.twigs.asFrequency
+import com.wbrawner.twigs.model.Permission
+import com.wbrawner.twigs.model.RecurringTransaction
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.requirePermission
+import com.wbrawner.twigs.storage.PermissionRepository
+import com.wbrawner.twigs.storage.RecurringTransactionRepository
+import com.wbrawner.twigs.toInstant
+import io.ktor.http.*
+import java.time.Instant
+
+interface RecurringTransactionService {
+    suspend fun recurringTransactions(
+        budgetId: String,
+        userId: String,
+    ): List<RecurringTransactionResponse>
+
+    suspend fun recurringTransaction(recurringTransactionId: String, userId: String): RecurringTransactionResponse
+
+    suspend fun save(
+        request: RecurringTransactionRequest,
+        userId: String,
+        recurringTransactionId: String? = null
+    ): RecurringTransactionResponse
+
+    suspend fun delete(recurringTransactionId: String, userId: String)
+}
+
+class DefaultRecurringTransactionService(
+    private val recurringTransactionRepository: RecurringTransactionRepository,
+    private val permissionRepository: PermissionRepository
+) : RecurringTransactionService {
+    override suspend fun recurringTransactions(
+        budgetId: String,
+        userId: String
+    ): List<RecurringTransactionResponse> {
+        permissionRepository.requirePermission(userId, budgetId, Permission.READ)
+        return recurringTransactionRepository.findAll(budgetId = budgetId)
+            .map { it.asResponse() }
+    }
+
+    override suspend fun recurringTransaction(
+        recurringTransactionId: String,
+        userId: String
+    ): RecurringTransactionResponse {
+        val recurringTransaction = recurringTransactionRepository.findAll(ids = listOf(recurringTransactionId))
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.NotFound)
+        permissionRepository.requirePermission(userId, recurringTransaction.budgetId, Permission.READ)
+        return recurringTransaction.asResponse()
+    }
+
+    override suspend fun save(
+        request: RecurringTransactionRequest,
+        userId: String,
+        recurringTransactionId: String?
+    ): RecurringTransactionResponse {
+        val recurringTransaction = recurringTransactionId?.let {
+            recurringTransactionRepository.findAll(ids = listOf(it))
+                .firstOrNull()
+                ?.also { recurringTransaction ->
+                    permissionRepository.requirePermission(userId, recurringTransaction.budgetId, Permission.WRITE)
+                }
+                ?: throw HttpException(HttpStatusCode.NotFound)
+        } ?: run {
+            if (request.title.isNullOrBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "title cannot be null or empty")
+            }
+            if (request.budgetId.isNullOrBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "budgetId cannot be null or empty")
+            }
+            RecurringTransaction(
+                title = request.title,
+                description = request.description,
+                amount = request.amount ?: 0L,
+                expense = request.expense ?: true,
+                budgetId = request.budgetId,
+                categoryId = request.categoryId,
+                createdBy = userId,
+                start = request.start?.toInstant() ?: Instant.now(),
+                finish = request.finish?.toInstant(),
+                frequency = request.frequency.asFrequency()
+            )
+        }
+        permissionRepository.requirePermission(userId, recurringTransaction.budgetId, Permission.WRITE)
+        return recurringTransactionRepository.save(
+            recurringTransaction.copy(
+                title = request.title?.ifBlank { recurringTransaction.title } ?: recurringTransaction.title,
+                description = request.description ?: recurringTransaction.description,
+                amount = request.amount ?: recurringTransaction.amount,
+                expense = request.expense ?: recurringTransaction.expense,
+                budgetId = request.budgetId?.ifBlank { recurringTransaction.budgetId } ?: recurringTransaction.budgetId,
+                categoryId = request.categoryId ?: recurringTransaction.categoryId,
+                start = request.start?.toInstant() ?: recurringTransaction.start,
+                finish = request.finish?.toInstant() ?: recurringTransaction.finish,
+                frequency = request.frequency.asFrequency()
+            )
+        ).asResponse()
+    }
+
+    override suspend fun delete(recurringTransactionId: String, userId: String) {
+        val recurringTransaction = recurringTransactionRepository.findAll(ids = listOf(recurringTransactionId))
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.NotFound)
+        permissionRepository.requirePermission(userId, recurringTransaction.budgetId, Permission.WRITE)
+        recurringTransactionRepository.delete(recurringTransaction)
+    }
+}

service/src/main/java/com/wbrawner/twigs/service/transaction/TransactionApi.kt

@@ -1,4 +1,4 @@
-package com.wbrawner.twigs
+package com.wbrawner.twigs.service.transaction
 
 import com.wbrawner.twigs.model.Transaction
 import kotlinx.serialization.Serializable

service/src/main/java/com/wbrawner/twigs/service/transaction/TransactionService.kt

@@ -0,0 +1,167 @@
+package com.wbrawner.twigs.service.transaction
+
+import com.wbrawner.twigs.endOfMonth
+import com.wbrawner.twigs.firstOfMonth
+import com.wbrawner.twigs.model.Permission
+import com.wbrawner.twigs.model.Transaction
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.requirePermission
+import com.wbrawner.twigs.storage.CategoryRepository
+import com.wbrawner.twigs.storage.PermissionRepository
+import com.wbrawner.twigs.storage.TransactionRepository
+import com.wbrawner.twigs.toInstant
+import com.wbrawner.twigs.toInstantOrNull
+import io.ktor.http.*
+import java.time.Instant
+
+interface TransactionService {
+    suspend fun transactions(
+        budgetIds: List<String>,
+        categoryIds: List<String>? = null,
+        from: Instant? = null,
+        to: Instant? = null,
+        expense: Boolean? = null,
+        userId: String,
+    ): List<TransactionResponse>
+
+    suspend fun transaction(transactionId: String, userId: String): TransactionResponse
+
+    suspend fun sum(
+        userId: String,
+        budgetId: String? = null,
+        categoryId: String? = null,
+        from: Instant? = null,
+        to: Instant? = null,
+    ): Long
+
+    suspend fun save(
+        request: TransactionRequest,
+        userId: String,
+        transactionId: String? = null
+    ): TransactionResponse
+
+    suspend fun delete(transactionId: String, userId: String)
+}
+
+class DefaultTransactionService(
+    private val transactionRepository: TransactionRepository,
+    private val categoryRepository: CategoryRepository,
+    private val permissionRepository: PermissionRepository
+) : TransactionService {
+    override suspend fun transactions(
+        budgetIds: List<String>,
+        categoryIds: List<String>?,
+        from: Instant?,
+        to: Instant?,
+        expense: Boolean?,
+        userId: String
+    ): List<TransactionResponse> {
+        permissionRepository.requirePermission(userId, budgetIds, Permission.READ)
+        return transactionRepository.findAll(
+            budgetIds = budgetIds,
+            categoryIds = categoryIds,
+            from = from,
+            to = to,
+            expense = expense
+        ).map { it.asResponse() }
+    }
+
+    override suspend fun transaction(
+        transactionId: String,
+        userId: String
+    ): TransactionResponse {
+        val transaction = transactionRepository.findAll(ids = listOf(transactionId))
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.NotFound)
+        permissionRepository.requirePermission(userId, transaction.budgetId, Permission.READ)
+        return transaction.asResponse()
+    }
+
+    override suspend fun sum(
+        userId: String,
+        budgetId: String?,
+        categoryId: String?,
+        from: Instant?,
+        to: Instant?
+    ): Long {
+        if (budgetId.isNullOrBlank() && categoryId.isNullOrBlank()) {
+            throw HttpException(HttpStatusCode.BadRequest, message = "budgetId or categoryId must be provided to sum")
+        }
+        if (budgetId?.isNotBlank() == true && categoryId?.isNotBlank() == true) {
+            throw HttpException(
+                HttpStatusCode.BadRequest,
+                message = "budgetId and categoryId cannot be provided together"
+            )
+        }
+        return if (!categoryId.isNullOrBlank()) {
+            val category = categoryRepository.findAll(ids = listOf(categoryId)).firstOrNull()
+                ?: throw HttpException(HttpStatusCode.NotFound)
+            permissionRepository.requirePermission(
+                userId = userId,
+                budgetId = category.budgetId,
+                permission = Permission.READ
+            )
+            transactionRepository.sumByCategory(category.id, from ?: firstOfMonth, to ?: endOfMonth)
+        } else if (!budgetId.isNullOrBlank()) {
+            permissionRepository.requirePermission(userId = userId, budgetId = budgetId, permission = Permission.READ)
+            transactionRepository.sumByBudget(budgetId, from ?: firstOfMonth, to ?: endOfMonth)
+        } else {
+            error("Somehow we didn't return either a budget or category sum")
+        }
+    }
+
+    override suspend fun save(
+        request: TransactionRequest,
+        userId: String,
+        transactionId: String?
+    ): TransactionResponse {
+        val transaction = transactionId?.let {
+            transactionRepository.findAll(ids = listOf(it))
+                .firstOrNull()
+                ?.also { transaction ->
+                    permissionRepository.requirePermission(userId, transaction.budgetId, Permission.WRITE)
+                }
+                ?: throw HttpException(HttpStatusCode.NotFound)
+        } ?: run {
+            if (request.title.isNullOrBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "title cannot be null or empty")
+            }
+            if (request.budgetId.isNullOrBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "budgetId cannot be null or empty")
+            }
+            if (request.date?.toInstantOrNull() == null) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "invalid date")
+            }
+            Transaction(
+                title = request.title,
+                description = request.description,
+                amount = request.amount ?: 0L,
+                expense = request.expense ?: true,
+                budgetId = request.budgetId,
+                categoryId = request.categoryId,
+                date = request.date.toInstant(),
+                createdBy = userId,
+            )
+        }
+        permissionRepository.requirePermission(userId, request.budgetId ?: transaction.budgetId, Permission.WRITE)
+        return transactionRepository.save(
+            transaction.copy(
+                title = request.title?.ifBlank { transaction.title } ?: transaction.title,
+                description = request.description ?: transaction.description,
+                amount = request.amount ?: transaction.amount,
+                expense = request.expense ?: transaction.expense,
+                budgetId = request.budgetId?.ifBlank { transaction.budgetId } ?: transaction.budgetId,
+                categoryId = request.categoryId ?: transaction.categoryId,
+                date = request.date?.toInstantOrNull() ?: transaction.date
+            )
+        ).asResponse()
+    }
+
+    override suspend fun delete(transactionId: String, userId: String) {
+        val transaction = transactionRepository.findAll(ids = listOf(transactionId))
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.NotFound)
+        permissionRepository.requirePermission(userId, transaction.budgetId, Permission.WRITE)
+        transactionRepository.delete(transaction)
+    }
+}

service/src/main/java/com/wbrawner/twigs/service/user/UserApi.kt

@@ -1,10 +1,10 @@
-package com.wbrawner.twigs
+package com.wbrawner.twigs.service.user
 
+import com.wbrawner.twigs.model.PasswordResetToken
 import com.wbrawner.twigs.model.Permission
 import com.wbrawner.twigs.model.Session
 import com.wbrawner.twigs.model.User
 import kotlinx.serialization.Serializable
-import java.util.*
 
 @Serializable
 data class UserRequest(
@@ -31,13 +31,24 @@ data class UserPermissionResponse(val user: String, val permission: Permission?)
 @Serializable
 data class SessionResponse(val userId: String, val token: String, val expiration: String)
 
-data class PasswordResetRequest(
-    val userId: Long,
-    val id: String = randomString(),
-    private val date: Calendar = GregorianCalendar(),
-    private val token: String = randomString()
-)
+/**
+ * Used to request the password reset email
+ */
+@Serializable
+data class ResetPasswordRequest(val username: String)
+
+/**
+ * Used to modify the user's password after receiving the password reset email
+ */
+@Serializable
+data class PasswordResetRequest(val token: String, val password: String)
+
+@Serializable
+data class PasswordResetTokenResponse(val userId: String, val id: String, val expiration: String)
 
 fun User.asResponse(): UserResponse = UserResponse(id, name, email)
 
-fun Session.asResponse(): SessionResponse = SessionResponse(userId, token, expiration.toString())
+fun Session.asResponse(): SessionResponse = SessionResponse(userId, token, expiration.toString())
+
+fun PasswordResetToken.asResponse(): PasswordResetTokenResponse =
+    PasswordResetTokenResponse(userId, id, expiration.toString())

service/src/main/java/com/wbrawner/twigs/service/user/UserService.kt

@@ -0,0 +1,178 @@
+package com.wbrawner.twigs.service.user
+
+import com.wbrawner.twigs.EmailService
+import com.wbrawner.twigs.model.PasswordResetToken
+import com.wbrawner.twigs.model.Session
+import com.wbrawner.twigs.model.User
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.storage.*
+import io.ktor.http.*
+import java.time.Instant
+
+interface UserService {
+
+    suspend fun login(request: LoginRequest): SessionResponse
+
+    suspend fun register(request: UserRequest): UserResponse
+
+    suspend fun requestPasswordResetEmail(request: ResetPasswordRequest)
+
+    suspend fun resetPassword(request: PasswordResetRequest)
+    suspend fun users(query: String?, budgetIds: List<String>?, requestingUserId: String): List<UserResponse>
+
+    suspend fun user(userId: String): UserResponse
+
+    suspend fun session(token: String): SessionResponse
+
+    suspend fun save(request: UserRequest, targetUserId: String, requestingUserId: String): UserResponse
+
+    suspend fun delete(targetUserId: String, requestingUserId: String)
+}
+
+class DefaultUserService(
+    private val emailService: EmailService,
+    private val passwordResetRepository: PasswordResetRepository,
+    private val permissionRepository: PermissionRepository,
+    private val sessionRepository: SessionRepository,
+    private val userRepository: UserRepository,
+    private val passwordHasher: PasswordHasher
+) : UserService {
+
+    override suspend fun login(request: LoginRequest): SessionResponse {
+        val user = userRepository.findAll(
+            nameOrEmail = request.username,
+            password = passwordHasher.hash(request.password)
+        )
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.Unauthorized, message = "Invalid credentials")
+        return sessionRepository.save(Session(userId = user.id)).asResponse()
+    }
+
+    override suspend fun register(request: UserRequest): UserResponse {
+        if (request.username.isNullOrBlank()) {
+            throw HttpException(HttpStatusCode.BadRequest, message = "username must not be null or blank")
+        }
+        if (request.password.isNullOrBlank()) {
+            throw HttpException(HttpStatusCode.BadRequest, message = "password must not be null or blank")
+        }
+        val existingUser = userRepository.findAll(nameOrEmail = request.username).firstOrNull()
+            ?: request.email?.let {
+                if (it.isBlank()) {
+                    null
+                } else {
+                    userRepository.findAll(nameOrEmail = it).firstOrNull()
+                }
+            }
+        existingUser?.let {
+            throw HttpException(HttpStatusCode.BadRequest, message = "username or email already taken")
+        }
+        return userRepository.save(
+            User(
+                name = request.username,
+                password = passwordHasher.hash(request.password),
+                email = if (request.email.isNullOrBlank()) null else request.email
+            )
+        ).asResponse()
+    }
+
+    override suspend fun requestPasswordResetEmail(request: ResetPasswordRequest) {
+        userRepository.findAll(nameOrEmail = request.username)
+            .firstOrNull()
+            ?.let {
+                val email = it.email ?: return@let
+                val passwordResetToken = passwordResetRepository.save(PasswordResetToken(userId = it.id))
+                emailService.sendPasswordResetEmail(passwordResetToken, email)
+            }
+    }
+
+    override suspend fun resetPassword(request: PasswordResetRequest) {
+        val passwordResetToken = passwordResetRepository.findAll(listOf(request.token))
+            .firstOrNull()
+            ?: throw HttpException(HttpStatusCode.Unauthorized, message = "Invalid token")
+        if (passwordResetToken.expiration.isBefore(Instant.now())) {
+            throw HttpException(HttpStatusCode.Unauthorized, message = "Token expired")
+        }
+        if (request.password.isBlank()) {
+            throw HttpException(HttpStatusCode.BadRequest, message = "password cannot be empty")
+        }
+        userRepository.findAll(listOf(passwordResetToken.userId))
+            .firstOrNull()
+            ?.let {
+                userRepository.save(it.copy(password = passwordHasher.hash(request.password)))
+                passwordResetRepository.delete(passwordResetToken)
+            }
+            ?: throw HttpException(HttpStatusCode.InternalServerError, message = "Invalid token")
+    }
+
+    override suspend fun users(
+        query: String?,
+        budgetIds: List<String>?,
+        requestingUserId: String
+    ): List<UserResponse> {
+        if (query != null) {
+            if (query.isBlank()) {
+                throw HttpException(HttpStatusCode.BadRequest, message = "query cannot be empty")
+            }
+            return userRepository.findAll(nameLike = query).map { it.asResponse() }
+        } else if (budgetIds == null || budgetIds.all { it.isBlank() }) {
+            throw HttpException(HttpStatusCode.BadRequest, message = "query or budgetId required but absent")
+        }
+        return permissionRepository.findAll(budgetIds = budgetIds, userId = requestingUserId)
+            .mapNotNull {
+                userRepository.findAll(ids = listOf(it.userId))
+                    .firstOrNull()
+                    ?.asResponse()
+            }
+    }
+
+    override suspend fun user(
+        userId: String
+    ): UserResponse {
+        return userRepository.findAll(ids = listOf(userId))
+            .firstOrNull()
+            ?.asResponse()
+            ?: throw HttpException(HttpStatusCode.NotFound)
+    }
+
+    override suspend fun session(token: String): SessionResponse {
+        return sessionRepository.findAll(token = token)
+            .firstOrNull()
+            ?.asResponse()
+            ?: throw HttpException(HttpStatusCode.Unauthorized)
+    }
+
+    override suspend fun save(
+        request: UserRequest,
+        targetUserId: String,
+        requestingUserId: String,
+    ): UserResponse {
+        // TODO: Add some kind of admin denotation to allow admins to edit other users
+        if (targetUserId != requestingUserId) {
+            throw HttpException(HttpStatusCode.Forbidden)
+        }
+        return userRepository.save(
+            userRepository.findAll(ids = listOf(targetUserId))
+                .first()
+                .run {
+                    val newPassword = if (request.password.isNullOrBlank()) {
+                        password
+                    } else {
+                        passwordHasher.hash(request.password)
+                    }
+                    copy(
+                        name = request.username ?: name,
+                        password = newPassword,
+                        email = request.email ?: email
+                    )
+                }
+        ).asResponse()
+    }
+
+    override suspend fun delete(targetUserId: String, requestingUserId: String) {
+        // TODO: Add some kind of admin denotation to allow admins to delete other users
+        if (targetUserId != requestingUserId) {
+            throw HttpException(HttpStatusCode.Forbidden)
+        }
+        userRepository.delete(userRepository.findAll(targetUserId).first())
+    }
+}

settings.gradle.kts

@@ -1,3 +1,4 @@
 rootProject.name = "twigs"
 include("core", "api", "app", "storage", "db", "web")
 include("testhelpers")
+include("service")

storage/build.gradle.kts

@@ -3,14 +3,12 @@ plugins {
     `java-library`
 }
 
-val ktorVersion: String by rootProject.extra
-
 dependencies {
     implementation(kotlin("stdlib"))
     api(project(":core"))
-    api("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+    api(libs.kotlinx.coroutines.core)
+    testImplementation(libs.junit.jupiter.api)
+    testRuntimeOnly(libs.junit.jupiter.engine)
 }
 
 tasks.getByName<Test>("test") {

storage/src/main/kotlin/com/wbrawner/twigs/storage/PasswordResetRepository.kt

@@ -0,0 +1,5 @@
+package com.wbrawner.twigs.storage
+
+import com.wbrawner.twigs.model.PasswordResetToken
+
+interface PasswordResetRepository : Repository<PasswordResetToken> {}

storage/src/main/kotlin/com/wbrawner/twigs/storage/PermissionRepository.kt

@@ -3,7 +3,7 @@ package com.wbrawner.twigs.storage
 import com.wbrawner.twigs.model.UserPermission
 
 interface PermissionRepository : Repository<UserPermission> {
-    fun findAll(
+    suspend fun findAll(
         budgetIds: List<String>? = null,
         userId: String? = null
     ): List<UserPermission>

storage/src/main/kotlin/com/wbrawner/twigs/storage/UserRepository.kt

@@ -5,8 +5,12 @@ import com.wbrawner.twigs.model.User
 interface UserRepository : Repository<User> {
     fun findAll(
         nameOrEmail: String,
-        password: String
+        password: String? = null
     ): List<User>
 
     fun findAll(nameLike: String): List<User>
+}
+
+fun interface PasswordHasher {
+    fun hash(password: String): String
 }

testhelpers/build.gradle.kts

@@ -6,7 +6,14 @@ plugins {
 dependencies {
     implementation(kotlin("stdlib"))
     implementation(project(":storage"))
-    api("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.5.2")
-    api("org.junit.jupiter:junit-jupiter-api:5.8.2")
-    api("org.junit.jupiter:junit-jupiter-engine")
+    api(libs.kotlinx.coroutines.test)
+    api(libs.junit.jupiter.api)
+    implementation(project(mapOf("path" to ":db")))
+    runtimeOnly(libs.junit.jupiter.engine)
 }
+
+tasks {
+    test {
+        useJUnitPlatform()
+    }
+}

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/FakeEmailService.kt

@@ -0,0 +1,14 @@
+package com.wbrawner.twigs.test.helpers
+
+import com.wbrawner.twigs.EmailService
+import com.wbrawner.twigs.model.PasswordResetToken
+
+class FakeEmailService : EmailService {
+    val emails = mutableListOf<FakeEmail<*>>()
+
+    override fun sendPasswordResetEmail(token: PasswordResetToken, to: String) {
+        emails.add(FakeEmail(to, token))
+    }
+}
+
+data class FakeEmail<Data>(val to: String, val data: Data)

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakeBudgetRepository.kt

@@ -0,0 +1,6 @@
+package com.wbrawner.twigs.test.helpers.repository
+
+import com.wbrawner.twigs.model.Budget
+import com.wbrawner.twigs.storage.BudgetRepository
+
+class FakeBudgetRepository : FakeRepository<Budget>(), BudgetRepository

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakeCategoryRepository.kt

@@ -0,0 +1,18 @@
+package com.wbrawner.twigs.test.helpers.repository
+
+import com.wbrawner.twigs.model.Category
+import com.wbrawner.twigs.storage.CategoryRepository
+
+class FakeCategoryRepository : FakeRepository<Category>(), CategoryRepository {
+    override fun findAll(
+        budgetIds: List<String>,
+        ids: List<String>?,
+        expense: Boolean?,
+        archived: Boolean?
+    ): List<Category> = entities.filter {
+        budgetIds.contains(it.budgetId)
+                && ids?.contains(it.id) ?: true
+                && it.expense == (expense ?: it.expense)
+                && it.archived == (archived ?: it.archived)
+    }
+}

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakeMetadataRepository.kt

@@ -0,0 +1,23 @@
+package com.wbrawner.twigs.test.helpers.repository
+
+import com.wbrawner.twigs.db.DatabaseMetadata
+import com.wbrawner.twigs.db.MetadataRepository
+import com.wbrawner.twigs.storage.Repository
+
+const val TEST_SALT = "testtesttesttest"
+
+class FakeMetadataRepository : Repository<DatabaseMetadata>, MetadataRepository {
+    var metadata = DatabaseMetadata(salt = TEST_SALT)
+    override fun runMigration(toVersion: Int) {
+        metadata = metadata.copy(version = toVersion)
+    }
+
+    override suspend fun findAll(ids: List<String>?): List<DatabaseMetadata> = listOf(metadata)
+
+    override suspend fun delete(item: DatabaseMetadata): Boolean = false
+
+    override suspend fun save(item: DatabaseMetadata): DatabaseMetadata {
+        metadata = item
+        return metadata
+    }
+}

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakePasswordResetRepository.kt

@@ -0,0 +1,6 @@
+package com.wbrawner.twigs.test.helpers.repository
+
+import com.wbrawner.twigs.model.PasswordResetToken
+import com.wbrawner.twigs.storage.PasswordResetRepository
+
+class FakePasswordResetRepository : FakeRepository<PasswordResetToken>(), PasswordResetRepository

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakePermissionRepository.kt

@@ -0,0 +1,26 @@
+package com.wbrawner.twigs.test.helpers.repository
+
+import com.wbrawner.twigs.model.UserPermission
+import com.wbrawner.twigs.storage.PermissionRepository
+
+class FakePermissionRepository : PermissionRepository {
+    val permissions: MutableList<UserPermission> = mutableListOf()
+    override suspend fun findAll(budgetIds: List<String>?, userId: String?): List<UserPermission> =
+        permissions.filter { userPermission ->
+            budgetIds?.contains(userPermission.budgetId) ?: true
+                    && userId?.let { it == userPermission.userId } ?: true
+        }
+
+    override suspend fun findAll(ids: List<String>?): List<UserPermission> {
+        throw UnsupportedOperationException("UserPermission requires a userId and budgetId")
+    }
+
+    override suspend fun save(item: UserPermission): UserPermission {
+        permissions.removeIf { it.budgetId == item.budgetId && it.userId == item.userId }
+        permissions.add(item)
+        return item
+    }
+
+    override suspend fun delete(item: UserPermission): Boolean =
+        permissions.removeIf { it.budgetId == item.budgetId && it.userId == item.userId }
+}

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakeRecurringTransactionRepository.kt

@@ -4,7 +4,7 @@ import com.wbrawner.twigs.model.RecurringTransaction
 import com.wbrawner.twigs.storage.RecurringTransactionRepository
 import java.time.Instant
 
-class FakeRecurringTransactionsRepository : FakeRepository<RecurringTransaction>(), RecurringTransactionRepository {
+class FakeRecurringTransactionRepository : FakeRepository<RecurringTransaction>(), RecurringTransactionRepository {
     override suspend fun findAll(now: Instant): List<RecurringTransaction> = entities.filter {
         (it.start == now || it.start.isBefore(now)) && it.finish?.isAfter(now) ?: true
     }

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakeRepository.kt

@@ -4,7 +4,7 @@ import com.wbrawner.twigs.Identifiable
 import com.wbrawner.twigs.storage.Repository
 
 abstract class FakeRepository<T : Identifiable> : Repository<T> {
-    val entities = mutableListOf<T>()
+    open val entities = mutableListOf<T>()
 
     override suspend fun findAll(ids: List<String>?): List<T> = if (ids == null) {
         entities

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakeSessionRepository.kt

@@ -0,0 +1,15 @@
+package com.wbrawner.twigs.test.helpers.repository
+
+import com.wbrawner.twigs.model.Session
+import com.wbrawner.twigs.storage.SessionRepository
+import java.util.function.Predicate
+
+class FakeSessionRepository : FakeRepository<Session>(), SessionRepository {
+    var expirationPredicate: Predicate<in Session> = Predicate { false }
+
+    override fun findAll(token: String): List<Session> = entities.filter { it.token == token }
+
+    override fun deleteExpired() {
+        entities.removeIf(expirationPredicate)
+    }
+}

testhelpers/src/main/kotlin/com/wbrawner/twigs/test/helpers/repository/FakeUserRepository.kt

@@ -0,0 +1,37 @@
+package com.wbrawner.twigs.test.helpers.repository
+
+import com.wbrawner.twigs.model.User
+import com.wbrawner.twigs.storage.UserRepository
+
+class FakeUserRepository : FakeRepository<User>(), UserRepository {
+    override val entities: MutableList<User> = mutableListOf(TEST_USER, OTHER_USER)
+
+    override fun findAll(nameOrEmail: String, password: String?): List<User> {
+        return entities.filter { user ->
+            (user.name.equals(nameOrEmail, ignoreCase = true) || user.email.equals(
+                nameOrEmail,
+                ignoreCase = true
+            )) && password?.let { user.password == it } ?: true
+        }
+    }
+
+    override fun findAll(nameLike: String): List<User> {
+        return entities.filter { it.name.contains(nameLike, ignoreCase = true) }
+    }
+
+    companion object {
+        val TEST_USER = User(
+            id = "id-test-user",
+            name = "testuser",
+            email = "test@example.com",
+            password = "testpass"
+        )
+
+        val OTHER_USER = User(
+            id = "id-other-user",
+            name = "otheruser",
+            email = "other@example.com",
+            password = "otherpass"
+        )
+    }
+}

web/build.gradle.kts

@@ -1,53 +1,18 @@
-import java.util.*
-
 plugins {
-    kotlin("jvm")
     `java-library`
+    alias(libs.plugins.kotlin.jvm)
 }
 
-val ktorVersion: String by rootProject.extra
-
 dependencies {
     implementation(kotlin("stdlib"))
-    api("io.ktor:ktor-server-core:$ktorVersion")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+    implementation(project(":core"))
+    implementation(project(":service"))
+    api(libs.ktor.server.core)
+    api(libs.ktor.server.mustache)
+    testImplementation(libs.junit.jupiter.api)
+    testRuntimeOnly(libs.junit.jupiter.engine)
 }
 
 tasks.getByName<Test>("test") {
     useJUnitPlatform()
-}
-
-// TODO: Replace this hack with either a git submodule or an internal Kotlin-based UI
-tasks.register("package") {
-    doLast {
-        val built = File(rootProject.rootDir.parent, "twigs-web/dist/twigs")
-        if (built.exists()) {
-            built.deleteRecursively()
-        }
-        val dest = File(project.projectDir, "src/main/resources/twigs")
-        if (dest.exists()) {
-            dest.deleteRecursively()
-        }
-        var command = listOf(
-            "cd", "../../twigs-web", ";",
-            "npm", "i", ";",
-            "npm", "run", "package"
-        )
-        command = if (System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("windows")) {
-            listOf("powershell", "-Command") + command
-        } else {
-            listOf("bash", "-c", "\"${command.joinToString(" ")}\"")
-        }
-        exec {
-            commandLine(command)
-        }
-        if (!built.copyRecursively(dest, true) || !dest.isDirectory) {
-            throw GradleException("Failed to copy files from ${built.absolutePath} to ${dest.absolutePath}")
-        }
-    }
-}
-
-//tasks.getByName("processResources") {
-//    dependsOn.add("package")
-//}
+}

web/src/main/kotlin/com/wbrawner/twigs/web/Page.kt

@@ -0,0 +1,28 @@
+package com.wbrawner.twigs.web
+
+import com.wbrawner.twigs.service.budget.BudgetResponse
+import com.wbrawner.twigs.service.user.UserResponse
+
+interface Page {
+    val title: String
+    val error: String?
+}
+
+interface AuthenticatedPage : Page {
+    val user: UserResponse
+    val budgets: List<BudgetListItem>
+}
+
+data class BudgetListItem(val id: String, val name: String, val description: String, val selected: Boolean)
+
+fun BudgetResponse.toBudgetListItem(selectedId: String? = null) = BudgetListItem(
+    id = id,
+    name = name.orEmpty(),
+    description = description.orEmpty(),
+    selected = id == selectedId
+)
+
+object NotFoundPage : Page {
+    override val title: String = "404 Not Found"
+    override val error: String? = null
+}

web/src/main/kotlin/com/wbrawner/twigs/web/WebRoutes.kt

@@ -1,24 +1,52 @@
 package com.wbrawner.twigs.web
 
-import io.ktor.application.*
-import io.ktor.http.content.*
-import io.ktor.request.*
-import io.ktor.response.*
-import io.ktor.routing.*
+import com.wbrawner.twigs.model.CookieSession
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.budget.BudgetService
+import com.wbrawner.twigs.service.category.CategoryService
+import com.wbrawner.twigs.service.transaction.TransactionService
+import com.wbrawner.twigs.service.user.UserService
+import com.wbrawner.twigs.web.budget.budgetWebRoutes
+import com.wbrawner.twigs.web.category.categoryWebRoutes
+import com.wbrawner.twigs.web.transaction.transactionWebRoutes
+import com.wbrawner.twigs.web.user.userWebRoutes
+import io.ktor.server.application.*
+import io.ktor.server.http.content.*
+import io.ktor.server.mustache.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.server.sessions.*
 
-fun Application.webRoutes() {
+fun Application.webRoutes(
+    budgetService: BudgetService,
+    categoryService: CategoryService,
+    transactionService: TransactionService,
+    userService: UserService
+) {
     routing {
-        static {
-            resources("twigs")
-            default("index.html")
-        }
-        intercept(ApplicationCallPipeline.Setup) {
-            if (!call.request.path().startsWith("/api") && !call.request.path().matches(Regex(".*\\.\\w+$"))) {
-                call.resolveResource("twigs/index.html")?.let {
-                    call.respond(it)
-                    return@intercept finish()
+        staticResources("/", "static")
+        get("/") {
+            call.sessions.get(CookieSession::class)
+                ?.let {
+                    try {
+                        userService.session(it.token)
+                    } catch (e: HttpException) {
+                        application.environment.log.debug("Failed to retrieve session for user", e)
+                        null
+                    }
                 }
-            }
+                ?.let { session ->
+                    application.environment.log.info("Session found!")
+                    budgetService.budgetsForUser(session.userId)
+                        .firstOrNull()
+                        ?.let { budget ->
+                            call.respondRedirect("/budgets/${budget.id}")
+                        } ?: call.respondRedirect("/budgets")
+                } ?: call.respond(MustacheContent("index.mustache", null))
         }
     }
+    budgetWebRoutes(budgetService, categoryService, transactionService, userService)
+    categoryWebRoutes(budgetService, categoryService, transactionService, userService)
+    transactionWebRoutes(budgetService, categoryService, transactionService, userService)
+    userWebRoutes(userService)
 }

web/src/main/kotlin/com/wbrawner/twigs/web/WebUtils.kt

@@ -0,0 +1,33 @@
+package com.wbrawner.twigs.web
+
+import io.ktor.http.*
+import java.math.BigDecimal
+import java.math.RoundingMode
+import java.text.DateFormat
+import java.text.DecimalFormat
+import java.text.NumberFormat
+import java.util.*
+
+val currencyFormat = NumberFormat.getCurrencyInstance(Locale.US)
+val decimalFormat = DecimalFormat.getNumberInstance(Locale.US).apply {
+    with(this as DecimalFormat) {
+        decimalFormatSymbols = decimalFormatSymbols.apply {
+            currencySymbol = ""
+            isGroupingUsed = false
+        }
+    }
+}
+val shortDateFormat = DateFormat.getDateInstance(DateFormat.SHORT, Locale.US)
+
+
+fun Parameters.getAmount() = decimalFormat.parse(get("amount"))
+    ?.toDouble()
+    ?.toBigDecimal()
+    ?.times(BigDecimal(100))
+    ?.toLong()
+    ?: 0L
+
+fun Long?.toDecimalString(): String {
+    if (this == null) return ""
+    return decimalFormat.format(toBigDecimal().divide(BigDecimal(100), 2, RoundingMode.HALF_UP))
+}

web/src/main/kotlin/com/wbrawner/twigs/web/budget/BudgetPages.kt

@@ -0,0 +1,44 @@
+package com.wbrawner.twigs.web.budget
+
+import com.wbrawner.twigs.service.budget.BudgetResponse
+import com.wbrawner.twigs.service.user.UserResponse
+import com.wbrawner.twigs.web.AuthenticatedPage
+import com.wbrawner.twigs.web.BudgetListItem
+import com.wbrawner.twigs.web.category.CategoryWithBalanceResponse
+
+data class BudgetListPage(
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = "Budgets"
+}
+
+data class BudgetDetailsPage(
+    val budget: BudgetResponse,
+    val balances: BudgetBalances,
+    val incomeCategories: List<CategoryWithBalanceResponse>,
+    val expenseCategories: List<CategoryWithBalanceResponse>,
+    val archivedIncomeCategories: List<CategoryWithBalanceResponse>,
+    val archivedExpenseCategories: List<CategoryWithBalanceResponse>,
+    val transactionCount: String,
+    val monthAndYear: String,
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = budget.name.orEmpty()
+}
+
+data class BudgetFormPage(
+    val budget: BudgetResponse,
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = if (budget.id.isBlank()) {
+        "New Budget"
+    } else {
+        "Edit Budget"
+    }
+}

web/src/main/kotlin/com/wbrawner/twigs/web/budget/BudgetWebRoutes.kt

@@ -0,0 +1,242 @@
+package com.wbrawner.twigs.web.budget
+
+import com.wbrawner.twigs.endOfMonth
+import com.wbrawner.twigs.firstOfMonth
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.budget.BudgetRequest
+import com.wbrawner.twigs.service.budget.BudgetResponse
+import com.wbrawner.twigs.service.budget.BudgetService
+import com.wbrawner.twigs.service.category.CategoryService
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.transaction.TransactionService
+import com.wbrawner.twigs.service.user.UserService
+import com.wbrawner.twigs.toInstantOrNull
+import com.wbrawner.twigs.web.NotFoundPage
+import com.wbrawner.twigs.web.category.CategoryWithBalanceResponse
+import com.wbrawner.twigs.web.toBudgetListItem
+import com.wbrawner.twigs.web.user.TWIGS_SESSION_COOKIE
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.mustache.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
+import java.math.BigDecimal
+import java.math.RoundingMode
+import java.text.NumberFormat
+import java.time.YearMonth
+import java.time.format.DateTimeFormatter
+import java.util.*
+import kotlin.math.abs
+
+fun Application.budgetWebRoutes(
+    budgetService: BudgetService,
+    categoryService: CategoryService,
+    transactionService: TransactionService,
+    userService: UserService
+) {
+    routing {
+        authenticate(TWIGS_SESSION_COOKIE) {
+            route("/budgets") {
+                get {
+                    val user = userService.user(requireSession().userId)
+                    val budgets = budgetService.budgetsForUser(user.id).map { it.toBudgetListItem() }
+                    call.respond(MustacheContent("budgets.mustache", BudgetListPage(budgets, user)))
+                }
+
+                route("/new") {
+                    get {
+                        val user = userService.user(requireSession().userId)
+                        call.respond(
+                            MustacheContent(
+                                "budget-form.mustache",
+                                BudgetFormPage(
+                                    budget = BudgetResponse(
+                                        id = "",
+                                        name = "",
+                                        description = "",
+                                        users = listOf()
+                                    ),
+                                    budgets = budgetService.budgetsForUser(user.id).map { it.toBudgetListItem() },
+                                    user = user
+                                )
+                            )
+                        )
+                    }
+
+                    post {
+                        val user = userService.user(requireSession().userId)
+                        try {
+                            val request = call.receiveParameters().toBudgetRequest()
+                            val budget = budgetService.save(request, user.id)
+                            call.respondRedirect("/budgets/${budget.id}")
+                        } catch (e: HttpException) {
+                            call.respond(
+                                status = e.statusCode,
+                                MustacheContent(
+                                    "budget-form.mustache",
+                                    BudgetFormPage(
+                                        budget = BudgetResponse(
+                                            id = "",
+                                            name = call.parameters["name"].orEmpty(),
+                                            description = call.parameters["description"].orEmpty(),
+                                            users = listOf()
+                                        ),
+                                        budgets = budgetService.budgetsForUser(user.id).map { it.toBudgetListItem() },
+                                        user = user,
+                                        error = e.message
+                                    )
+                                )
+                            )
+                        }
+                    }
+                }
+
+                route("/{id}") {
+                    get {
+                        val user = userService.user(requireSession().userId)
+                        val budgetId = call.parameters.getOrFail("id")
+                        val budgets = budgetService.budgetsForUser(userId = user.id).toMutableList()
+                        val budget = budgets.firstOrNull { it.id == budgetId }
+                            ?: run {
+                                call.respond(MustacheContent("404.mustache", NotFoundPage))
+                                return@get
+                            }
+                        val numberFormat = NumberFormat.getCurrencyInstance(Locale.US)
+                        val categories = categoryService.categories(budgetIds = listOf(budget.id), userId = user.id)
+                            .map { category ->
+                                val categoryBalance =
+                                    abs(transactionService.sum(categoryId = category.id, userId = user.id))
+                                CategoryWithBalanceResponse(
+                                    category = category,
+                                    amountLabel = category.amount.toCurrencyString(numberFormat),
+                                    balance = categoryBalance,
+                                    balanceLabel = categoryBalance.toCurrencyString(numberFormat),
+                                    remainingAmountLabel = (category.amount - categoryBalance).toCurrencyString(
+                                        numberFormat
+                                    )
+                                )
+                            }
+                            .toMutableSet()
+                        val incomeCategories = categories.extractIf { !it.category.expense && !it.category.archived }
+                        val archivedIncomeCategories =
+                            categories.extractIf { !it.category.expense && it.category.archived }
+                        val expenseCategories = categories.extractIf { it.category.expense && !it.category.archived }
+                        val archivedExpenseCategories =
+                            categories.extractIf { it.category.expense && it.category.archived }
+                        val transactions = transactionService.transactions(
+                            budgetIds = listOf(budget.id),
+                            from = call.parameters["from"]?.toInstantOrNull() ?: firstOfMonth,
+                            to = call.parameters["to"]?.toInstantOrNull() ?: endOfMonth,
+                            userId = user.id
+                        )
+                        // TODO: Allow user-configurable locale
+                        val budgetBalance = transactionService.sum(budgetId = budget.id, userId = user.id)
+                            .toCurrencyString(numberFormat)
+                        val expectedIncome = incomeCategories.sumOf { it.category.amount }
+                        val actualIncome = transactions.sumOf { if (it.expense == false) it.amount ?: 0L else 0L }
+                        val expectedExpenses = expenseCategories.sumOf { it.category.amount }
+                        val actualExpenses = transactions.sumOf { if (it.expense == true) it.amount ?: 0L else 0L }
+                        val balances = BudgetBalances(
+                            cashFlow = budgetBalance,
+                            expectedIncome = expectedIncome,
+                            expectedIncomeLabel = expectedIncome.toCurrencyString(numberFormat),
+                            actualIncome = actualIncome,
+                            actualIncomeLabel = actualIncome.toCurrencyString(numberFormat),
+                            expectedExpenses = expectedExpenses,
+                            expectedExpensesLabel = expectedExpenses.toCurrencyString(numberFormat),
+                            actualExpenses = actualExpenses,
+                            actualExpensesLabel = actualExpenses.toCurrencyString(numberFormat),
+                        )
+                        call.respond(
+                            MustacheContent(
+                                "budget-details.mustache", BudgetDetailsPage(
+                                    budget = budget,
+                                    balances = balances,
+                                    incomeCategories = incomeCategories,
+                                    expenseCategories = expenseCategories,
+                                    archivedIncomeCategories = archivedIncomeCategories,
+                                    archivedExpenseCategories = archivedExpenseCategories,
+                                    transactionCount = NumberFormat.getNumberInstance(Locale.US)
+                                        .format(transactions.size),
+                                    monthAndYear = YearMonth.now().format(DateTimeFormatter.ofPattern("MMMM yyyy")),
+                                    budgets = budgets.map { it.toBudgetListItem(budgetId) }.sortedBy { it.name },
+                                    user = user
+                                )
+                            )
+                        )
+                    }
+
+                    route("/edit") {
+                        get {
+                            val user = userService.user(requireSession().userId)
+                            val budget = budgetService.budget(
+                                budgetId = call.parameters.getOrFail("id"),
+                                userId = user.id
+                            )
+                            call.respond(
+                                MustacheContent(
+                                    "budget-form.mustache",
+                                    BudgetFormPage(
+                                        budget = budget,
+                                        budgets = budgetService.budgetsForUser(user.id)
+                                            .map { it.toBudgetListItem(budget.id) },
+                                        user = user
+                                    )
+                                )
+                            )
+                        }
+                    }
+
+                    route("/delete") {
+                        post {
+                            val user = userService.user(requireSession().userId)
+                            val budgetId = call.parameters.getOrFail("id")
+                            budgetService.delete(budgetId = budgetId, userId = user.id)
+                            call.respondRedirect("/")
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+data class BudgetBalances(
+    val cashFlow: String,
+    val expectedIncome: Long,
+    val expectedIncomeLabel: String,
+    val actualIncome: Long,
+    val actualIncomeLabel: String,
+    val expectedExpenses: Long,
+    val expectedExpensesLabel: String,
+    val actualExpenses: Long,
+    val actualExpensesLabel: String,
+) {
+    val maxProgressBarValue: Long = maxOf(expectedExpenses, expectedIncome, actualIncome, actualExpenses)
+}
+
+private fun Parameters.toBudgetRequest() = BudgetRequest(
+    name = get("name"),
+    description = get("description"),
+    users = setOf() // TODO: Enable adding users at budget creation
+)
+
+private fun <T> MutableCollection<T>.extractIf(predicate: (T) -> Boolean): List<T> {
+    val extracted = mutableListOf<T>()
+    val iterator = iterator()
+    while (iterator.hasNext()) {
+        val item = iterator.next()
+        if (predicate(item)) {
+            extracted.add(item)
+            iterator.remove()
+        }
+    }
+    return extracted
+}
+
+fun Long.toCurrencyString(formatter: NumberFormat): String = formatter.format(
+    this.toBigDecimal().divide(BigDecimal(100), 2, RoundingMode.HALF_UP)
+)

web/src/main/kotlin/com/wbrawner/twigs/web/category/CategoryPages.kt

@@ -0,0 +1,67 @@
+package com.wbrawner.twigs.web.category
+
+import com.wbrawner.twigs.service.budget.BudgetResponse
+import com.wbrawner.twigs.service.category.CategoryResponse
+import com.wbrawner.twigs.service.transaction.TransactionResponse
+import com.wbrawner.twigs.service.user.UserResponse
+import com.wbrawner.twigs.web.AuthenticatedPage
+import com.wbrawner.twigs.web.BudgetListItem
+import com.wbrawner.twigs.web.budget.toCurrencyString
+import java.text.NumberFormat
+
+data class CategoryDetailsPage(
+    val category: CategoryWithBalanceResponse,
+    val budget: BudgetResponse,
+    val transactionCount: String,
+    val transactions: List<Map.Entry<String, List<TransactionListItem>>>,
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = category.category.title
+}
+
+data class TransactionListItem(
+    val id: String,
+    val title: String,
+    val description: String,
+    val budgetId: String,
+    val expenseClass: String,
+    val amountLabel: String
+)
+
+fun TransactionResponse.toListItem(numberFormat: NumberFormat) = TransactionListItem(
+    id,
+    title.orEmpty(),
+    description.orEmpty(),
+    budgetId,
+    if (expense != false) "expense" else "income",
+    (amount ?: 0L).toCurrencyString(numberFormat)
+)
+
+data class CategoryFormPage(
+    val category: CategoryResponse,
+    val amountLabel: String,
+    val budget: BudgetResponse,
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = if (category.id.isBlank()) {
+        "New Category"
+    } else {
+        "Edit Category"
+    }
+
+    val expenseChecked: String = if (category.expense) "checked" else ""
+    val incomeChecked: String = if (!category.expense) "checked" else ""
+    val archivedChecked: String = if (category.archived) "checked" else ""
+}
+
+data class CategoryWithBalanceResponse(
+    val category: CategoryResponse,
+    val amountLabel: String,
+    val balance: Long,
+    val balanceLabel: String,
+    val remainingAmountLabel: String,
+)

web/src/main/kotlin/com/wbrawner/twigs/web/category/CategoryWebRoutes.kt

@@ -0,0 +1,245 @@
+package com.wbrawner.twigs.web.category
+
+import com.wbrawner.twigs.endOfMonth
+import com.wbrawner.twigs.firstOfMonth
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.budget.BudgetService
+import com.wbrawner.twigs.service.category.CategoryRequest
+import com.wbrawner.twigs.service.category.CategoryResponse
+import com.wbrawner.twigs.service.category.CategoryService
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.transaction.TransactionService
+import com.wbrawner.twigs.service.user.UserService
+import com.wbrawner.twigs.toInstant
+import com.wbrawner.twigs.toInstantOrNull
+import com.wbrawner.twigs.web.*
+import com.wbrawner.twigs.web.budget.toCurrencyString
+import com.wbrawner.twigs.web.user.TWIGS_SESSION_COOKIE
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.mustache.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
+import io.ktor.util.date.*
+import java.text.NumberFormat
+import java.util.*
+import kotlin.math.abs
+
+fun Application.categoryWebRoutes(
+    budgetService: BudgetService,
+    categoryService: CategoryService,
+    transactionService: TransactionService,
+    userService: UserService
+) {
+    routing {
+        authenticate(TWIGS_SESSION_COOKIE) {
+            route("/budgets/{budgetId}/categories") {
+                get {
+                    val budgetId = call.parameters.getOrFail("budgetId")
+                    call.respondRedirect("/budgets/$budgetId")
+                }
+
+                route("/new") {
+                    get {
+                        val user = userService.user(requireSession().userId)
+                        val budgetId = call.parameters.getOrFail("budgetId")
+                        val budgets = budgetService.budgetsForUser(user.id)
+                        val budget = budgets.first { it.id == budgetId }
+                        call.respond(
+                            MustacheContent(
+                                "category-form.mustache",
+                                CategoryFormPage(
+                                    CategoryResponse(
+                                        id = "",
+                                        title = "",
+                                        description = "",
+                                        amount = 0,
+                                        budgetId = budgetId,
+                                        expense = call.request.queryParameters["expense"]?.toBoolean() ?: true,
+                                        archived = false,
+                                    ),
+                                    amountLabel = 0L.toDecimalString(),
+                                    budget = budget,
+                                    budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                    user = user
+                                )
+                            )
+                        )
+                    }
+
+                    post {
+                        val user = userService.user(requireSession().userId)
+                        val budgetId = call.parameters.getOrFail("budgetId")
+                        val budgets = budgetService.budgetsForUser(user.id)
+                        val budget = budgets.first { it.id == budgetId }
+                        try {
+                            val request = call.receiveParameters().toCategoryRequest(budgetId)
+                            val category = categoryService.save(request, user.id)
+                            call.respondRedirect("/budgets/${category.budgetId}/categories/${category.id}")
+                        } catch (e: HttpException) {
+                            call.respond(
+                                status = e.statusCode,
+                                MustacheContent(
+                                    "category-form.mustache",
+                                    CategoryFormPage(
+                                        CategoryResponse(
+                                            id = "",
+                                            title = call.parameters["title"].orEmpty(),
+                                            description = call.parameters["description"].orEmpty(),
+                                            amount = 0L,
+                                            expense = call.parameters["expense"]?.toBoolean() ?: false,
+                                            archived = call.parameters["archived"]?.toBoolean() ?: false,
+                                            budgetId = budgetId
+                                        ),
+                                        amountLabel = call.parameters["amount"]?.toLongOrNull().toDecimalString(),
+                                        budget = budget,
+                                        budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                        user = user,
+                                        error = e.message
+                                    )
+                                )
+                            )
+                        }
+                    }
+                }
+
+                route("/{id}") {
+                    get {
+                        val user = userService.user(requireSession().userId)
+                        val categoryId = call.parameters.getOrFail("id")
+                        try {
+                            val category = categoryService.category(categoryId = categoryId, userId = user.id)
+                            val categoryBalance =
+                                abs(transactionService.sum(categoryId = category.id, userId = user.id))
+                            val categoryWithBalance = CategoryWithBalanceResponse(
+                                category = category,
+                                amountLabel = category.amount.toCurrencyString(currencyFormat),
+                                balance = categoryBalance,
+                                balanceLabel = categoryBalance.toCurrencyString(currencyFormat),
+                                remainingAmountLabel = (category.amount - categoryBalance).toCurrencyString(
+                                    currencyFormat
+                                )
+                            )
+                            val transactions = transactionService.transactions(
+                                budgetIds = listOf(category.budgetId),
+                                categoryIds = listOf(category.id),
+                                from = call.parameters["from"]?.toInstantOrNull() ?: firstOfMonth,
+                                to = call.parameters["to"]?.toInstantOrNull() ?: endOfMonth,
+                                userId = user.id
+                            )
+                            val transactionCount = NumberFormat.getNumberInstance(Locale.US)
+                                .format(transactions.size)
+                            val transactionsByDate = transactions.groupBy {
+                                shortDateFormat.format(it.date.toInstant().toGMTDate().toJvmDate())
+                            }
+                                .mapValues { (_, transactions) -> transactions.map { it.toListItem(currencyFormat) } }
+                                .entries
+                                .sortedByDescending { it.key }
+                            val budgets = budgetService.budgetsForUser(user.id)
+                            val budgetId = call.parameters.getOrFail("budgetId")
+                            val budget = budgets.first { it.id == budgetId }
+                            call.respond(
+                                MustacheContent(
+                                    "category-details.mustache", CategoryDetailsPage(
+                                        category = categoryWithBalance,
+                                        transactions = transactionsByDate,
+                                        transactionCount = transactionCount,
+                                        budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                        budget = budget,
+                                        user = user
+                                    )
+                                )
+                            )
+                        } catch (e: HttpException) {
+                            call.respond(
+                                status = e.statusCode,
+                                MustacheContent("404.mustache", NotFoundPage)
+                            )
+                        }
+                    }
+
+                    route("/edit") {
+                        get {
+                            val user = userService.user(requireSession().userId)
+                            val category = categoryService.category(
+                                categoryId = call.parameters.getOrFail("id"),
+                                userId = user.id
+                            )
+                            val budgetId = call.parameters.getOrFail("budgetId")
+                            val budgets = budgetService.budgetsForUser(user.id)
+                            call.respond(
+                                MustacheContent(
+                                    "category-form.mustache",
+                                    CategoryFormPage(
+                                        category = category,
+                                        amountLabel = category.amount.toDecimalString(),
+                                        budget = budgets.first { it.id == budgetId },
+                                        budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                        user = user
+                                    )
+                                )
+                            )
+                        }
+
+                        post {
+                            val user = userService.user(requireSession().userId)
+                            val budgetId = call.parameters.getOrFail("budgetId")
+                            val budgets = budgetService.budgetsForUser(user.id)
+                            val categoryId = call.parameters.getOrFail("id")
+                            try {
+                                val request = call.receiveParameters().toCategoryRequest(budgetId)
+                                val category = categoryService.save(request, userId = user.id, categoryId = categoryId)
+                                call.respondRedirect("/budgets/${category.budgetId}/categories/${category.id}")
+                            } catch (e: HttpException) {
+                                call.respond(
+                                    status = e.statusCode,
+                                    MustacheContent(
+                                        "category-form.mustache",
+                                        CategoryFormPage(
+                                            CategoryResponse(
+                                                id = "",
+                                                title = call.parameters["title"].orEmpty(),
+                                                description = call.parameters["description"].orEmpty(),
+                                                amount = 0L,
+                                                expense = call.parameters["expense"]?.toBoolean() ?: false,
+                                                archived = call.parameters["archived"]?.toBoolean() ?: false,
+                                                budgetId = budgetId
+                                            ),
+                                            amountLabel = call.parameters["amount"]?.toLongOrNull().toDecimalString(),
+                                            budget = budgets.first { it.id == budgetId },
+                                            budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                            user = user,
+                                            error = e.message
+                                        )
+                                    )
+                                )
+                            }
+                        }
+                    }
+
+                    route("/delete") {
+                        post {
+                            val user = userService.user(requireSession().userId)
+                            val categoryId = call.parameters.getOrFail("id")
+                            categoryService.delete(categoryId = categoryId, userId = user.id)
+                            val budgetId = call.parameters.getOrFail("budgetId")
+                            call.respondRedirect("/budgets/$budgetId")
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+private fun Parameters.toCategoryRequest(budgetId: String) = CategoryRequest(
+    title = get("title"),
+    description = get("description"),
+    amount = getAmount(),
+    expense = get("expense")?.toBoolean(),
+    archived = get("archived") == "on",
+    budgetId = budgetId
+)

web/src/main/kotlin/com/wbrawner/twigs/web/transaction/TransactionPages.kt

@@ -0,0 +1,66 @@
+package com.wbrawner.twigs.web.transaction
+
+import com.wbrawner.twigs.service.budget.BudgetResponse
+import com.wbrawner.twigs.service.category.CategoryResponse
+import com.wbrawner.twigs.service.transaction.TransactionResponse
+import com.wbrawner.twigs.service.user.UserResponse
+import com.wbrawner.twigs.web.AuthenticatedPage
+import com.wbrawner.twigs.web.BudgetListItem
+import com.wbrawner.twigs.web.category.TransactionListItem
+
+data class TransactionListPage(
+    val budget: BudgetResponse,
+    val transactions: List<Map.Entry<String, List<TransactionListItem>>>,
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = "Transactions"
+}
+
+
+data class TransactionDetailsPage(
+    val transaction: TransactionResponse,
+    val category: CategoryResponse?,
+    val budget: BudgetResponse,
+    val amountLabel: String,
+    val dateLabel: String,
+    val createdBy: UserResponse,
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = transaction.title.orEmpty()
+}
+
+data class TransactionFormPage(
+    val transaction: TransactionResponse,
+    val amountLabel: String,
+    val budget: BudgetResponse,
+    val categoryOptions: List<CategoryOption>,
+    override val budgets: List<BudgetListItem>,
+    override val user: UserResponse,
+    override val error: String? = null
+) : AuthenticatedPage {
+    override val title: String = if (transaction.id.isBlank()) {
+        "New Transaction"
+    } else {
+        "Edit Transaction"
+    }
+
+    data class CategoryOption(
+        val id: String,
+        val title: String,
+        val isSelected: Boolean = false,
+        val isDisabled: Boolean = false
+    ) {
+        val selected: String
+            get() = if (isSelected) "selected" else ""
+
+        val disabled: String
+            get() = if (isDisabled) "disabled" else ""
+    }
+}
+
+fun CategoryResponse.asOption(selectedCategoryId: String) =
+    TransactionFormPage.CategoryOption(id, title, id == selectedCategoryId)

web/src/main/kotlin/com/wbrawner/twigs/web/transaction/TransactionWebRoutes.kt

@@ -0,0 +1,362 @@
+package com.wbrawner.twigs.web.transaction
+
+import com.wbrawner.twigs.endOfMonth
+import com.wbrawner.twigs.firstOfMonth
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.budget.BudgetService
+import com.wbrawner.twigs.service.category.CategoryService
+import com.wbrawner.twigs.service.requireSession
+import com.wbrawner.twigs.service.transaction.TransactionRequest
+import com.wbrawner.twigs.service.transaction.TransactionResponse
+import com.wbrawner.twigs.service.transaction.TransactionService
+import com.wbrawner.twigs.service.user.UserResponse
+import com.wbrawner.twigs.service.user.UserService
+import com.wbrawner.twigs.toInstant
+import com.wbrawner.twigs.toInstantOrNull
+import com.wbrawner.twigs.web.*
+import com.wbrawner.twigs.web.budget.toCurrencyString
+import com.wbrawner.twigs.web.category.toListItem
+import com.wbrawner.twigs.web.user.TWIGS_SESSION_COOKIE
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.mustache.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.server.util.*
+import io.ktor.util.date.*
+import java.time.Instant
+import java.time.ZoneOffset.UTC
+import java.time.format.DateTimeFormatter
+import java.time.temporal.ChronoUnit
+
+fun Application.transactionWebRoutes(
+    budgetService: BudgetService,
+    categoryService: CategoryService,
+    transactionService: TransactionService,
+    userService: UserService
+) {
+    routing {
+        authenticate(TWIGS_SESSION_COOKIE) {
+            route("/budgets/{budgetId}/transactions") {
+                get {
+                    val user = userService.user(requireSession().userId)
+                    val budgetId = call.parameters.getOrFail("budgetId")
+                    val budgets = budgetService.budgetsForUser(user.id)
+                    val transactions = transactionService.transactions(
+                        budgetIds = listOf(budgetId),
+                        from = call.parameters["from"]?.toInstantOrNull() ?: firstOfMonth,
+                        to = call.parameters["to"]?.toInstantOrNull() ?: endOfMonth,
+                        userId = user.id
+                    )
+                    val transactionsByDate = transactions.groupBy {
+                        shortDateFormat.format(it.date.toInstant().toGMTDate().toJvmDate())
+                    }
+                        .mapValues { (_, transactions) -> transactions.map { it.toListItem(currencyFormat) } }
+                        .entries
+                        .sortedByDescending { it.key }
+                    call.respond(
+                        MustacheContent(
+                            "budget-transactions.mustache",
+                            TransactionListPage(
+                                budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                budget = budgets.first { it.id == budgetId },
+                                transactions = transactionsByDate,
+                                user = user
+                            )
+                        )
+                    )
+                }
+
+                route("/new") {
+                    get {
+                        val user = userService.user(requireSession().userId)
+                        val budgetId = call.parameters.getOrFail("budgetId")
+                        val budgets = budgetService.budgetsForUser(user.id)
+                        val budget = budgets.first { it.id == budgetId }
+                        val categoryId = call.request.queryParameters["categoryId"]
+                        val transaction = TransactionResponse(
+                            id = "",
+                            title = "",
+                            description = "",
+                            amount = 0,
+                            budgetId = budgetId,
+                            expense = true,
+                            date = Instant.now().toHtmlInputString(),
+                            categoryId = categoryId,
+                            createdBy = user.id
+                        )
+                        call.respond(
+                            MustacheContent(
+                                "transaction-form.mustache",
+                                TransactionFormPage(
+                                    transaction = transaction,
+                                    amountLabel = 0L.toDecimalString(),
+                                    budget = budget,
+                                    categoryOptions = categoryOptions(
+                                        transaction = transaction,
+                                        categoryService = categoryService,
+                                        budgetId = budgetId,
+                                        user = user
+                                    ),
+                                    budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                    user = user
+                                )
+                            )
+                        )
+                    }
+
+                    post {
+                        val user = userService.user(requireSession().userId)
+                        val urlBudgetId = call.parameters.getOrFail("budgetId")
+                        val budgets = budgetService.budgetsForUser(user.id)
+                        val budget = budgets.first { it.id == urlBudgetId }
+                        try {
+                            val request = call.receiveParameters().toTransactionRequest()
+                                .run {
+                                    copy(
+                                        date = "$date:00Z",
+                                        expense = categoryService.category(
+                                            categoryId = requireNotNull(categoryId),
+                                            userId = user.id
+                                        ).expense,
+                                        budgetId = urlBudgetId
+                                    )
+                                }
+                            val transaction = transactionService.save(request, user.id)
+                            call.respondRedirect("/budgets/${transaction.budgetId}/transactions/${transaction.id}")
+                        } catch (e: HttpException) {
+                            val transaction = TransactionResponse(
+                                id = "",
+                                title = call.parameters["title"],
+                                description = call.parameters["description"],
+                                amount = 0L,
+                                budgetId = urlBudgetId,
+                                expense = call.parameters["expense"]?.toBoolean() ?: true,
+                                date = call.parameters["date"].orEmpty(),
+                                categoryId = call.parameters["categoryId"],
+                                createdBy = user.id
+                            )
+                            call.respond(
+                                status = e.statusCode,
+                                MustacheContent(
+                                    "transaction-form.mustache",
+                                    TransactionFormPage(
+                                        transaction = transaction,
+                                        amountLabel = call.parameters["amount"].orEmpty(),
+                                        budget = budget,
+                                        categoryOptions = categoryOptions(
+                                            transaction,
+                                            categoryService,
+                                            urlBudgetId,
+                                            user
+                                        ),
+                                        budgets = budgets.map { it.toBudgetListItem(urlBudgetId) },
+                                        user = user,
+                                        error = e.message
+                                    )
+                                )
+                            )
+                        }
+                    }
+                }
+
+                route("/{id}") {
+                    get {
+                        val user = userService.user(requireSession().userId)
+                        val transactionId = call.parameters.getOrFail("id")
+                        val budgetId = call.parameters.getOrFail("budgetId")
+                        // TODO: Allow user-configurable locale
+                        try {
+                            val transaction = transactionService.transaction(
+                                transactionId = transactionId,
+                                userId = user.id
+                            )
+                            check(transaction.budgetId == budgetId) {
+                                // TODO: redirect instead of error?
+                                "Attempted to fetch transaction from wrong budget"
+                            }
+                            val category = transaction.categoryId?.let {
+                                categoryService.category(categoryId = it, userId = user.id)
+                            }
+                            val budgets = budgetService.budgetsForUser(user.id)
+                            val budget = budgets.first { it.id == budgetId }
+                            val dateFormat = DateTimeFormatter.ofPattern("H:mm a 'on' MMMM d, yyyy")
+                            val transactionInstant = transaction.date.toInstant()
+                            val transactionOffset = transactionInstant.atOffset(UTC)
+                            val dateLabel = transactionOffset.format(dateFormat)
+                            call.respond(
+                                MustacheContent(
+                                    "transaction-details.mustache", TransactionDetailsPage(
+                                        transaction = transaction,
+                                        category = category,
+                                        budget = budget,
+                                        budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                        amountLabel = transaction.amount?.toCurrencyString(currencyFormat).orEmpty(),
+                                        dateLabel = dateLabel,
+                                        createdBy = userService.user(transaction.createdBy),
+                                        user = user
+                                    )
+                                )
+                            )
+                        } catch (e: HttpException) {
+                            call.respond(
+                                status = e.statusCode,
+                                MustacheContent("404.mustache", NotFoundPage)
+                            )
+                        }
+                    }
+
+                    route("/edit") {
+                        get {
+                            val user = userService.user(requireSession().userId)
+                            val budgetId = call.parameters.getOrFail("budgetId")
+                            val budgets = budgetService.budgetsForUser(user.id)
+                            val budget = budgets.first { it.id == budgetId }
+                            val transaction = transactionService.transaction(
+                                transactionId = call.parameters.getOrFail("id"),
+                                userId = user.id
+                            )
+                            call.respond(
+                                MustacheContent(
+                                    "transaction-form.mustache",
+                                    TransactionFormPage(
+                                        transaction = transaction.copy(
+                                            date = transaction.date.toInstant().toHtmlInputString()
+                                        ),
+                                        amountLabel = transaction.amount.toDecimalString(),
+                                        budget = budget,
+                                        categoryOptions = categoryOptions(transaction, categoryService, budgetId, user),
+                                        budgets = budgets.map { it.toBudgetListItem(budgetId) },
+                                        user = user
+                                    )
+                                )
+                            )
+                        }
+
+                        post {
+                            val user = userService.user(requireSession().userId)
+                            val transactionId = call.parameters.getOrFail("id")
+                            val urlBudgetId = call.parameters.getOrFail("budgetId")
+                            val budgets = budgetService.budgetsForUser(user.id)
+                            val budget = budgets.first { it.id == urlBudgetId }
+                            try {
+                                val request = call.receiveParameters().toTransactionRequest()
+                                    .run {
+                                        copy(
+                                            date = "$date:00Z",
+                                            expense = categoryService.category(
+                                                categoryId = requireNotNull(categoryId),
+                                                userId = user.id
+                                            ).expense,
+                                            budgetId = urlBudgetId
+                                        )
+                                    }
+                                val transaction =
+                                    transactionService.save(request, userId = user.id, transactionId = transactionId)
+                                call.respondRedirect("/budgets/${transaction.budgetId}/transactions/${transaction.id}")
+                            } catch (e: HttpException) {
+                                val transaction = TransactionResponse(
+                                    id = transactionId,
+                                    title = call.parameters["title"],
+                                    description = call.parameters["description"],
+                                    amount = 0L,
+                                    budgetId = urlBudgetId,
+                                    expense = call.parameters["expense"]?.toBoolean() ?: true,
+                                    date = call.parameters["date"].orEmpty(),
+                                    categoryId = call.parameters["categoryId"],
+                                    createdBy = user.id
+                                )
+                                call.respond(
+                                    status = e.statusCode,
+                                    MustacheContent(
+                                        "transaction-form.mustache",
+                                        TransactionFormPage(
+                                            transaction = transaction,
+                                            amountLabel = call.parameters["amount"].orEmpty(),
+                                            budget = budget,
+                                            categoryOptions = categoryOptions(
+                                                transaction,
+                                                categoryService,
+                                                urlBudgetId,
+                                                user
+                                            ),
+                                            budgets = budgets.map { it.toBudgetListItem(urlBudgetId) },
+                                            user = user,
+                                            error = e.message
+                                        )
+                                    )
+                                )
+                            }
+                        }
+                    }
+
+                    route("/delete") {
+                        post {
+                            val user = userService.user(requireSession().userId)
+                            val transactionId = call.parameters.getOrFail("id")
+                            val urlBudgetId = call.parameters.getOrFail("budgetId")
+                            transactionService.delete(transactionId = transactionId, userId = user.id)
+                            call.respondRedirect("/budgets/${urlBudgetId}")
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+private suspend fun categoryOptions(
+    transaction: TransactionResponse,
+    categoryService: CategoryService,
+    budgetId: String,
+    user: UserResponse
+): List<TransactionFormPage.CategoryOption> {
+    val selectedCategoryId = transaction.categoryId.orEmpty()
+    val categoryOptions = listOf(
+        TransactionFormPage.CategoryOption(
+            "",
+            "Select a category",
+            isSelected = transaction.categoryId.isNullOrBlank(),
+            isDisabled = true
+        ),
+        TransactionFormPage.CategoryOption("income", "Income", isDisabled = true),
+    )
+        .plus(
+            categoryService.categories(
+                budgetIds = listOf(budgetId),
+                userId = user.id,
+                expense = false,
+                archived = false
+            ).map { category ->
+                category.asOption(selectedCategoryId)
+            }
+        )
+        .plus(
+            TransactionFormPage.CategoryOption("expense", "Expense", isDisabled = true),
+        )
+        .plus(
+            categoryService.categories(
+                budgetIds = listOf(budgetId),
+                userId = user.id,
+                expense = true,
+                archived = false
+            ).map { category ->
+                category.asOption(selectedCategoryId)
+            }
+        )
+    return categoryOptions
+}
+
+private fun Parameters.toTransactionRequest() = TransactionRequest(
+    title = get("title"),
+    description = get("description"),
+    amount = getAmount(),
+    expense = false,
+    date = get("date"),
+    categoryId = get("categoryId"),
+    budgetId = get("budgetId"),
+)
+
+private fun Instant.toHtmlInputString() = truncatedTo(ChronoUnit.MINUTES).toString().substringBefore(":00Z")

web/src/main/kotlin/com/wbrawner/twigs/web/user/UserPages.kt

@@ -0,0 +1,11 @@
+package com.wbrawner.twigs.web.user
+
+import com.wbrawner.twigs.web.Page
+
+data class LoginPage(val username: String = "", override val error: String? = null) : Page {
+    override val title: String = "Login"
+}
+
+data class RegisterPage(val username: String = "", val email: String = "", override val error: String? = null) : Page {
+    override val title: String = "Register"
+}

web/src/main/kotlin/com/wbrawner/twigs/web/user/UserWebRoutes.kt

@@ -0,0 +1,94 @@
+package com.wbrawner.twigs.web.user
+
+import com.wbrawner.twigs.model.CookieSession
+import com.wbrawner.twigs.service.HttpException
+import com.wbrawner.twigs.service.user.LoginRequest
+import com.wbrawner.twigs.service.user.UserRequest
+import com.wbrawner.twigs.service.user.UserService
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.mustache.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.server.sessions.*
+import io.ktor.server.util.*
+
+const val TWIGS_SESSION_COOKIE = "twigsSession"
+
+fun Application.userWebRoutes(userService: UserService) {
+    routing {
+        route("/login") {
+            get {
+                call.respond(MustacheContent("login.mustache", LoginPage()))
+            }
+
+            post {
+                val request = call.receiveParameters().toLoginRequest()
+                try {
+                    val session = userService.login(request)
+                    call.sessions.set(CookieSession(session.token))
+                    call.respondRedirect("/")
+                } catch (e: Throwable) {
+                    e.printStackTrace()
+                    call.respond(
+                        status = (e as? HttpException)?.statusCode ?: HttpStatusCode.InternalServerError,
+                        MustacheContent("login.mustache", LoginPage(username = request.username, error = e.message))
+                    )
+                }
+            }
+        }
+
+        route("/logout") {
+            post {
+                call.sessions.clear<CookieSession>()
+                call.respondRedirect("/")
+            }
+        }
+
+        route("/register") {
+            get {
+                call.respond(MustacheContent("register.mustache", RegisterPage()))
+            }
+
+            post {
+                val request = call.receiveParameters()
+                val userRequest = request.toUserRequest()
+                val confirmPassword = request.getOrFail("confirmPassword")
+                if (userRequest.password != confirmPassword) {
+                    call.respond(
+                        HttpStatusCode.BadRequest,
+                        MustacheContent(
+                            "register.mustache",
+                            userRequest.toPage("passwords don't match")
+                        )
+                    )
+                    return@post
+                }
+                try {
+                    userService.register(userRequest)
+                    val session = userService.login(
+                        LoginRequest(
+                            requireNotNull(userRequest.username),
+                            requireNotNull(userRequest.password)
+                        )
+                    )
+                    call.sessions.set(CookieSession(session.token))
+                    call.respondRedirect("/")
+                } catch (e: HttpException) {
+                    call.respond(
+                        status = e.statusCode,
+                        MustacheContent("register.mustache", userRequest.toPage(error = e.message))
+                    )
+                }
+            }
+        }
+    }
+}
+
+private fun Parameters.toLoginRequest() = LoginRequest(get("username").orEmpty(), get("password").orEmpty())
+
+private fun Parameters.toUserRequest() = UserRequest(get("username").orEmpty(), get("password").orEmpty(), get("email"))
+
+private fun UserRequest.toPage(error: String? = null) =
+    RegisterPage(username = username.orEmpty(), email = email.orEmpty(), error = error)