Migrate to redux-style store in shared module

.idea/misc.xml

@@ -28,6 +28,10 @@
         <entry key="../../../../layout/compose-model-1646331413004.xml" value="0.4506079027355623" />
         <entry key="../../../../layout/compose-model-1646332602415.xml" value="0.13775083612040134" />
         <entry key="../../../../layout/compose-model-1646358533232.xml" value="0.30153061224489797" />
+        <entry key="../../../../layout/compose-model-1647060386627.xml" value="0.1" />
+        <entry key="../../../../layout/compose-model-1647060537103.xml" value="0.12374581939799331" />
+        <entry key="../../../../layout/compose-model-1647101512079.xml" value="0.12332775919732442" />
+        <entry key="../../../../layout/compose-model-1647102165810.xml" value="0.1" />
         <entry key="app/src/main/res/drawable-v26/ic_shortcut_enable.xml" value="0.27447916666666666" />
         <entry key="app/src/main/res/drawable-v26/ic_shortcut_pause.xml" value="0.27447916666666666" />
         <entry key="app/src/main/res/drawable/background_splash.xml" value="0.409375" />

app/src/main/java/com/wbrawner/pihelper/AddPiHelperViewModel.kt

@@ -1,142 +0,0 @@
-package com.wbrawner.pihelper
-
-import android.content.SharedPreferences
-import android.util.Log
-import androidx.core.content.edit
-import androidx.lifecycle.ViewModel
-import com.wbrawner.pihelper.shared.PiholeAPIService
-import com.wbrawner.pihelper.shared.VersionResponse
-import dagger.hilt.android.lifecycle.HiltViewModel
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.withContext
-import java.net.ConnectException
-import java.net.SocketTimeoutException
-import javax.inject.Inject
-
-const val KEY_BASE_URL = "baseUrl"
-const val KEY_API_KEY = "apiKey"
-const val IP_MIN = 0
-const val IP_MAX = 255
-
-@HiltViewModel
-class AddPiHelperViewModel @Inject constructor(
-    private val sharedPreferences: SharedPreferences,
-    private val apiService: PiholeAPIService
-) : ViewModel() {
-
-    @Volatile
-    var baseUrl: String? = sharedPreferences.getString(KEY_BASE_URL, null)
-        set(value) {
-            sharedPreferences.edit {
-                putString(KEY_BASE_URL, value)
-            }
-            field = value
-        }
-
-    @Volatile
-    var apiKey: String? = sharedPreferences.getString(KEY_API_KEY, null)
-        set(value) {
-            sharedPreferences.edit {
-                putString(KEY_API_KEY, value)
-            }
-            field = value
-        }
-
-    init {
-        apiService.baseUrl = this.baseUrl
-        apiService.apiKey = this.apiKey
-    }
-
-    val loadingMessage = MutableStateFlow<String?>(null)
-    val errorMessage = MutableStateFlow<String?>(null)
-
-    suspend fun beginScanning(deviceIpAddress: String, onSuccess: () -> Unit, onFailure: () -> Unit) {
-        val addressParts = deviceIpAddress.split(".").toMutableList()
-        var chunks = 1
-        // If the Pi-hole is correctly set up, then there should be a special host for it as
-        // "pi.hole"
-        val ipAddresses = mutableListOf("pi.hole")
-        while (chunks <= IP_MAX) {
-            val chunkSize = (IP_MAX - IP_MIN + 1) / chunks
-            if (chunkSize == 1) {
-                return
-            }
-            for (chunk in 0 until chunks) {
-                val chunkStart = IP_MIN + (chunk * chunkSize)
-                val chunkEnd = IP_MIN + ((chunk + 1) * chunkSize)
-                addressParts[3] = (((chunkEnd - chunkStart) / 2) + chunkStart).toString()
-                ipAddresses.add(addressParts.joinToString("."))
-            }
-            chunks *= 2
-        }
-        if (scan(ipAddresses)) {
-            onSuccess()
-        } else {
-            onFailure()
-        }
-    }
-
-    private suspend fun scan(ipAddresses: MutableList<String>): Boolean {
-        if (ipAddresses.isEmpty()) {
-            loadingMessage.value = null
-            return false
-        }
-
-        val ipAddress = ipAddresses.removeAt(0)
-        loadingMessage.value = "Scanning $ipAddress..."
-        return if (!connectToIpAddress(ipAddress)) {
-            scan(ipAddresses)
-        } else {
-            true
-        }
-    }
-
-    suspend fun connectToIpAddress(ipAddress: String): Boolean {
-        val version: VersionResponse? = withContext(Dispatchers.IO) {
-            try {
-                apiService.baseUrl = ipAddress
-                apiService.getVersion()
-            } catch (ignored: ConnectException) {
-                null
-            } catch (ignored: SocketTimeoutException) {
-                null
-            } catch (e: Exception) {
-                Log.e("Pi-helper", "Failed to load Pi-Hole version at $ipAddress", e)
-                null
-            }
-        }
-        if (version != null) {
-            baseUrl = ipAddress
-            return true
-        }
-        return false
-    }
-
-    suspend fun authenticateWithPassword(password: String): Boolean {
-        // The Pi-hole API key is just the web password hashed twice with SHA-256
-        return authenticateWithApiKey(password.hash().hash())
-    }
-
-    suspend fun authenticateWithApiKey(apiKey: String): Boolean {
-        // This uses the topItems endpoint to test that the API key is working since it requires
-        // authentication and is fairly simple to determine whether or not the request was
-        // successful
-        errorMessage.value = null
-        apiService.apiKey = apiKey
-        return try {
-            apiService.getTopItems()
-            this.apiKey = apiKey
-            true
-        } catch (e: Exception) {
-            Log.e("Pi-helper", "Unable to authenticate with API key", e)
-            errorMessage.value = "Authentication failed"
-            false
-        }
-    }
-
-    fun forgetPihole() {
-        baseUrl = null
-        apiKey = null
-    }
-}

app/src/main/java/com/wbrawner/pihelper/AddScreen.kt

@@ -1,38 +1,64 @@
 package com.wbrawner.pihelper
 
-import android.util.Log
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
+import android.os.Build
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.OutlinedTextField
 import androidx.compose.material.Text
-import androidx.compose.runtime.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.RectangleShape
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import androidx.navigation.NavController
+import com.wbrawner.pihelper.shared.Action
+import com.wbrawner.pihelper.shared.Store
 import com.wbrawner.pihelper.ui.PihelperTheme
-import kotlinx.coroutines.launch
+import java.net.Inet4Address
 
 @Composable
-fun AddScreen(navController: NavController, addPiHelperViewModel: AddPiHelperViewModel) {
-    val coroutineScope = rememberCoroutineScope()
-    val loadingMessage by addPiHelperViewModel.loadingMessage.collectAsState()
+fun AddScreen(store: Store) {
+    val context = LocalContext.current
     AddPiholeForm(
-        scanNetwork = { navController.navigate(Screens.SCAN.route) },
-        connectToPihole = {
-            coroutineScope.launch {
-                if (addPiHelperViewModel.connectToIpAddress(it)) {
-                    Log.d("AddScreen", "Connected, going to auth")
-                    navController.navigate(Screens.AUTH.route)
+        scanNetwork = {
+            if (BuildConfig.DEBUG && Build.MODEL == "Android SDK built for x86") {
+                // For emulators, just begin scanning the host machine directly
+                store.dispatch(Action.Scan("10.0.2.2"))
+                return@AddPiholeForm
+            }
+            (context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager)
+                ?.let { connectivityManager ->
+                    connectivityManager.allNetworks
+                        .filter {
+                            connectivityManager.getNetworkCapabilities(it)
+                                ?.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
+                                ?: false
+                        }
+                        .forEach { network ->
+                            connectivityManager.getLinkProperties(network)
+                                ?.linkAddresses
+                                ?.filter { !it.address.isLoopbackAddress && it.address is Inet4Address }
+                                ?.mapNotNull { it.address.hostAddress }
+                                ?.forEach {
+                                    store.dispatch(Action.Scan(it))
                                 }
                         }
+                }
+
         },
-        loadingMessage = loadingMessage
+        connectToPihole = {
+            store.dispatch(Action.Connect(it))
+        },
+        store.state.value.loading
     )
 }
 
@@ -40,7 +66,7 @@ fun AddScreen(navController: NavController, addPiHelperViewModel: AddPiHelperVie
 fun AddPiholeForm(
     scanNetwork: () -> Unit,
     connectToPihole: (String) -> Unit,
-    loadingMessage: String? = null
+    loading: Boolean = false
 ) {
     val (host: String, setHost: (String) -> Unit) = remember { mutableStateOf("pi.hole") }
     Column(
@@ -50,7 +76,7 @@ fun AddPiholeForm(
         horizontalAlignment = Alignment.CenterHorizontally,
         verticalArrangement = Arrangement.spacedBy(8.dp, Alignment.CenterVertically),
     ) {
-        LoadingSpinner(loadingMessage != null)
+        LoadingSpinner(loading)
         Text(
             text = "If you're not sure what the IP address for your Pi-hole is, Pi-helper can " +
                     "attempt to find it for you by scanning your network.",

app/src/main/java/com/wbrawner/pihelper/AuthScreen.kt

@@ -16,11 +16,13 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.input.PasswordVisualTransformation
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
-import androidx.navigation.NavController
+import com.wbrawner.pihelper.shared.Action
+import com.wbrawner.pihelper.shared.AuthenticationString
+import com.wbrawner.pihelper.shared.Store
 import kotlinx.coroutines.launch
 
 @Composable
-fun AuthScreen(navController: NavController, addPiHelperViewModel: AddPiHelperViewModel) {
+fun AuthScreen(store: Store) {
     val (password: String, setPassword: (String) -> Unit) = remember { mutableStateOf("") }
     val (apiKey: String, setApiKey: (String) -> Unit) = remember { mutableStateOf("") }
     val coroutineScope = rememberCoroutineScope()
@@ -53,11 +55,7 @@ fun AuthScreen(navController: NavController, addPiHelperViewModel: AddPiHelperVi
             visualTransformation = PasswordVisualTransformation()
         )
         PrimaryButton(text = "Authenticate with Password") {
-            coroutineScope.launch {
-                if (addPiHelperViewModel.authenticateWithPassword(password)) {
-                    navController.navigate(Screens.MAIN.route)
-                }
-            }
+            store.dispatch(Action.Authenticate(AuthenticationString.Password(password)))
         }
         OrDivider()
         OutlinedTextField(
@@ -69,9 +67,7 @@ fun AuthScreen(navController: NavController, addPiHelperViewModel: AddPiHelperVi
         )
         PrimaryButton(text = "Authenticate with API Key") {
             coroutineScope.launch {
-                if (addPiHelperViewModel.authenticateWithApiKey(password)) {
-                    navController.navigate(Screens.MAIN.route)
-                }
+                store.dispatch(Action.Authenticate(AuthenticationString.Token(apiKey)))
             }
         }
     }

app/src/main/java/com/wbrawner/pihelper/Extensions.kt

@@ -1,24 +0,0 @@
-package com.wbrawner.pihelper
-
-import android.view.View
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import java.math.BigInteger
-import java.security.MessageDigest
-
-fun String.hash(): String = BigInteger(
-    1,
-    MessageDigest.getInstance("SHA-256").digest(this.toByteArray())
-).toString(16).padStart(64, '0')
-
-fun CoroutineScope.cancel() {
-    coroutineContext[Job]?.cancel()
-}
-
-fun View.setSuspendingOnClickListener(
-    coroutineScope: CoroutineScope,
-    clickListener: suspend (v: View) -> Unit
-) = setOnClickListener { v ->
-    coroutineScope.launch { clickListener(v) }
-}

app/src/main/java/com/wbrawner/pihelper/InfoScreen.kt

@@ -17,14 +17,12 @@ import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.buildAnnotatedString
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextDecoration
-import androidx.compose.ui.text.withStyle
 import androidx.compose.ui.unit.dp
-import androidx.core.content.ContextCompat.startActivity
-import androidx.navigation.NavController
-import androidx.navigation.NavOptions
+import com.wbrawner.pihelper.shared.Action
+import com.wbrawner.pihelper.shared.Store
 
 @Composable
-fun InfoScreen(navController: NavController, addPiHelperViewModel: AddPiHelperViewModel) {
+fun InfoScreen(store: Store) {
     Column(
         modifier = Modifier
             .padding(16.dp)
@@ -77,11 +75,7 @@ fun InfoScreen(navController: NavController, addPiHelperViewModel: AddPiHelperVi
                 uriHandler.openUri(annotation.item)
             }
         }
-        TextButton(onClick = {
-            addPiHelperViewModel.forgetPihole()
-            navController.navigate(Screens.ADD.route)
-            navController.backQueue.clear()
-        }) {
+        TextButton(onClick = { store.dispatch(Action.Forget) }) {
             Text(text = "Forget Pi-hole")
         }
     }

app/src/main/java/com/wbrawner/pihelper/MainActivity.kt

@@ -4,6 +4,7 @@ import android.os.Build
 import android.os.Bundle
 import android.view.View
 import android.view.WindowInsetsController
+import android.widget.Toast
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.animation.ExperimentalAnimationApi
@@ -13,23 +14,31 @@ import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.rotate
 import androidx.compose.ui.graphics.ColorFilter
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.core.content.ContextCompat
-import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
+import com.wbrawner.pihelper.shared.Action
+import com.wbrawner.pihelper.shared.Effect
+import com.wbrawner.pihelper.shared.Store
 import com.wbrawner.pihelper.ui.PihelperTheme
 import dagger.hilt.android.AndroidEntryPoint
+import javax.inject.Inject
 
 @ExperimentalAnimationApi
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
+    @Inject
+    lateinit var store: Store
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -37,7 +46,8 @@ class MainActivity : AppCompatActivity() {
             val isDarkTheme = isSystemInDarkTheme()
             LaunchedEffect(key1 = isDarkTheme) {
                 if (isDarkTheme) return@LaunchedEffect
-                window.navigationBarColor = ContextCompat.getColor(this@MainActivity, R.color.colorSurface)
+                window.navigationBarColor =
+                    ContextCompat.getColor(this@MainActivity, R.color.colorSurface)
                 if (Build.VERSION.SDK_INT > Build.VERSION_CODES.Q) {
                     window.insetsController?.setSystemBarsAppearance(
                         WindowInsetsController.APPEARANCE_LIGHT_STATUS_BARS or WindowInsetsController.APPEARANCE_LIGHT_NAVIGATION_BARS,
@@ -49,46 +59,69 @@ class MainActivity : AppCompatActivity() {
                         View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR or View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR
                 }
             }
+            val state by store.state.collectAsState()
             val navController = rememberNavController()
-            val addPiHoleViewModel: AddPiHelperViewModel = viewModel()
             val startDestination = when {
-                addPiHoleViewModel.baseUrl == null -> {
+                state.host == null -> {
                     Screens.ADD
                 }
-                addPiHoleViewModel.apiKey == null -> {
+                state.apiKey == null -> {
                     Screens.AUTH
                 }
                 else -> {
                     Screens.MAIN
                 }
             }
+            LaunchedEffect(state) {
+                if (!state.scanning.isNullOrBlank()) {
+                    navController.navigateIfNotAlreadyThere(Screens.SCAN.route)
+                } else if (state.host == null) {
+                    navController.navigateIfNotAlreadyThere(Screens.ADD.route)
+                } else if (state.apiKey == null) {
+                    navController.navigateIfNotAlreadyThere(Screens.AUTH.route)
+                } else if (state.showAbout) {
+                    navController.navigateIfNotAlreadyThere(Screens.INFO.route)
+                } else if (state.status != null) {
+                    navController.navigateIfNotAlreadyThere(Screens.MAIN.route)
+                }
+            }
+            val effect by store.effects.collectAsState(initial = Effect.Empty)
+            val context = LocalContext.current
+            LaunchedEffect(effect) {
+                when (effect) {
+                    is Effect.Error -> Toast.makeText(
+                        context,
+                        (effect as Effect.Error).message,
+                        Toast.LENGTH_SHORT
+                    ).show()
+                    is Effect.Exit -> finish()
+                }
+            }
             PihelperTheme {
                 NavHost(navController, startDestination = startDestination.route) {
                     composable(Screens.ADD.route) {
-                        AddScreen(navController, addPiHoleViewModel)
+                        AddScreen(store)
                     }
                     composable(Screens.SCAN.route) {
-                        ScanScreen(navController, addPiHoleViewModel)
+                        ScanScreen(store)
                     }
                     composable(Screens.AUTH.route) {
-                        AuthScreen(
-                            navController = navController,
-                            addPiHelperViewModel = addPiHoleViewModel
-                        )
+                        AuthScreen(store)
                     }
                     composable(Screens.MAIN.route) {
-                        MainScreen(navController = navController)
+                        MainScreen(store)
                     }
                     composable(Screens.INFO.route) {
-                        InfoScreen(
-                            navController = navController,
-                            addPiHelperViewModel = addPiHoleViewModel
-                        )
+                        InfoScreen(store)
                     }
                 }
             }
         }
     }
+
+    override fun onBackPressed() {
+        store.dispatch(Action.Back)
+    }
 }
 
 enum class Screens(val route: String) {
@@ -124,3 +157,9 @@ fun LoadingSpinner(animate: Boolean = false) {
 fun LoadingSpinner_Preview() {
     LoadingSpinner()
 }
+
+fun NavController.navigateIfNotAlreadyThere(route: String) {
+    if (currentDestination?.route != route) {
+        navigate(route)
+    }
+}

app/src/main/java/com/wbrawner/pihelper/MainScreen.kt

@@ -9,17 +9,19 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.*
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Settings
-import androidx.compose.runtime.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import androidx.hilt.navigation.compose.hiltViewModel
-import androidx.navigation.NavController
-import androidx.navigation.compose.rememberNavController
+import com.wbrawner.pihelper.shared.Action
 import com.wbrawner.pihelper.shared.Status
+import com.wbrawner.pihelper.shared.Store
 import com.wbrawner.pihelper.ui.PihelperTheme
 import java.util.*
 import kotlin.math.pow
@@ -27,11 +29,8 @@ import kotlin.math.roundToLong
 
 @ExperimentalAnimationApi
 @Composable
-fun MainScreen(navController: NavController, viewModel: PiHelperViewModel = hiltViewModel()) {
-    LaunchedEffect(key1 = viewModel) {
-        viewModel.monitorSummary()
-    }
-    val status by viewModel.status.collectAsState()
+fun MainScreen(store: Store) {
+    val state = store.state.collectAsState()
     Scaffold(
         topBar = {
             TopAppBar(
@@ -40,7 +39,7 @@ fun MainScreen(navController: NavController, viewModel: PiHelperViewModel = hilt
                 contentColor = MaterialTheme.colors.onBackground,
                 elevation = 0.dp,
                 actions = {
-                    IconButton(onClick = { navController.navigate(Screens.INFO.route) }) {
+                    IconButton(onClick = { store.dispatch(Action.About) }) {
                         Icon(
                             imageVector = Icons.Default.Settings,
                             contentDescription = "Settings",
@@ -59,27 +58,19 @@ fun MainScreen(navController: NavController, viewModel: PiHelperViewModel = hilt
             verticalArrangement = Arrangement.spacedBy(8.dp, Alignment.CenterVertically),
             horizontalAlignment = Alignment.CenterHorizontally
         ) {
-            LoadingSpinner(status == Status.LOADING)
-            AnimatedVisibility(visible = status != Status.LOADING) {
-                StatusLabel(status)
-                if (status == Status.ENABLED) {
-                    DisableControls(viewModel)
+            LoadingSpinner(state.value.loading)
+            AnimatedVisibility(visible = !state.value.loading) {
+                state.value.status?.let {
+                    StatusLabel(it)
+                    if (it == Status.ENABLED) {
+                        DisableControls { duration -> store.dispatch(Action.Disable(duration)) }
                     } else {
-                    EnableControls(viewModel::enablePiHole)
+                        EnableControls { store.dispatch(Action.Enable) }
                     }
                 }
             }
         }
     }
-
-@ExperimentalAnimationApi
-@Composable
-@Preview
-fun MainScreen_Preview() {
-    val navController = rememberNavController()
-    PihelperTheme(false) {
-        MainScreen(navController = navController)
-    }
 }
 
 @Composable
@@ -121,7 +112,7 @@ fun EnableControls(onClick: () -> Unit) {
 }
 
 @Composable
-fun DisableControls(viewModel: PiHelperViewModel = hiltViewModel()) {
+fun DisableControls(disable: (duration: Long?) -> Unit) {
     val (dialogVisible, setDialogVisible) = remember { mutableStateOf(false) }
     Column(
         modifier = Modifier
@@ -130,13 +121,13 @@ fun DisableControls(viewModel: PiHelperViewModel = hiltViewModel()) {
             .padding(start = 16.dp, top = 48.dp, end = 16.dp),
         verticalArrangement = Arrangement.spacedBy(8.dp, Alignment.CenterVertically)
     ) {
-        PrimaryButton("Disable for 10 seconds") { viewModel.disablePiHole(10) }
-        PrimaryButton("Disable for 30 seconds") { viewModel.disablePiHole(30) }
-        PrimaryButton("Disable for 5 minutes") { viewModel.disablePiHole(300) }
+        PrimaryButton("Disable for 10 seconds") { disable(10) }
+        PrimaryButton("Disable for 30 seconds") { disable(30) }
+        PrimaryButton("Disable for 5 minutes") { disable(300) }
         PrimaryButton("Disable for custom time") { setDialogVisible(true) }
-        PrimaryButton("Disable permanently") { viewModel.disablePiHole() }
+        PrimaryButton("Disable permanently") { disable(null) }
         CustomTimeDialog(dialogVisible, setDialogVisible) {
-            viewModel.disablePiHole(it)
+            disable(it)
         }
     }
 }
@@ -325,5 +316,5 @@ fun EnableControls_DarkPreview() {
 @Composable
 @Preview
 fun DisableControls_Preview() {
-    DisableControls()
+    DisableControls({})
 }

app/src/main/java/com/wbrawner/pihelper/PiHelperModule.kt

@@ -1,42 +1,24 @@
 package com.wbrawner.pihelper
 
-import android.content.Context
-import android.content.SharedPreferences
-import androidx.security.crypto.EncryptedSharedPreferences
 import com.wbrawner.pihelper.shared.PiholeAPIService
+import com.wbrawner.pihelper.shared.Store
 import com.wbrawner.pihelper.shared.create
 import dagger.Module
 import dagger.Provides
 import dagger.hilt.InstallIn
-import dagger.hilt.android.qualifiers.ApplicationContext
 import dagger.hilt.components.SingletonComponent
-import javax.inject.Named
 import javax.inject.Singleton
 
-const val ENCRYPTED_SHARED_PREFS_FILE_NAME = "pihelper.prefs"
-const val NAME_BASE_URL = "baseUrl"
-
 @Module
 @InstallIn(SingletonComponent::class)
 object PiHelperModule {
-    @Provides
-    @Singleton
-    fun providesSharedPreferences(@ApplicationContext context: Context): SharedPreferences =
-        EncryptedSharedPreferences.create(
-            ENCRYPTED_SHARED_PREFS_FILE_NAME,
-            "pihelper",
-            context,
-            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
-            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
-        )
-
-    @Provides
-    @Singleton
-    @Named(NAME_BASE_URL)
-    fun providesBaseUrl(sharedPreferences: SharedPreferences) = sharedPreferences
-        .getString(KEY_BASE_URL, "")
-
     @Provides
     @Singleton
     fun providesPiholeAPIService(): PiholeAPIService = PiholeAPIService.create()
+
+    @Provides
+    @Singleton
+    fun providesStore(
+        apiService: PiholeAPIService,
+    ): Store = Store(apiService)
 }

app/src/main/java/com/wbrawner/pihelper/PiHelperViewModel.kt

@@ -1,53 +0,0 @@
-package com.wbrawner.pihelper
-
-import android.util.Log
-import androidx.lifecycle.ViewModel
-import com.wbrawner.pihelper.shared.PiholeAPIService
-import com.wbrawner.pihelper.shared.Status
-import com.wbrawner.pihelper.shared.StatusProvider
-import dagger.hilt.android.lifecycle.HiltViewModel
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.isActive
-import javax.inject.Inject
-import kotlin.coroutines.coroutineContext
-
-@HiltViewModel
-class PiHelperViewModel @Inject constructor(
-    private val apiService: PiholeAPIService
-) : ViewModel() {
-    private val _status = MutableStateFlow(Status.LOADING)
-    val status = _status.asStateFlow()
-    private var action: (suspend () -> StatusProvider)? = null
-        get() = field ?: defaultAction
-    private var defaultAction = suspend {
-        apiService.getSummary()
-    }
-
-    suspend fun monitorSummary() {
-        while (coroutineContext.isActive) {
-            try {
-                _status.value = action!!.invoke().status
-                action = null
-            } catch (ignored: Exception) {
-                _status.value = Status.UNKNOWN
-            }
-            delay(1000)
-        }
-    }
-
-    fun enablePiHole() {
-        _status.value = Status.LOADING
-        action = {
-            apiService.enable()
-        }
-    }
-
-    fun disablePiHole(duration: Long? = null) {
-        _status.value = Status.LOADING
-        action = {
-            apiService.disable(duration)
-        }
-    }
-}

app/src/main/java/com/wbrawner/pihelper/ScanScreen.kt

@@ -1,77 +1,28 @@
 package com.wbrawner.pihelper
 
-import android.content.Context
-import android.net.ConnectivityManager
-import android.net.NetworkCapabilities
-import android.os.Build
-import android.util.Log
-import androidx.compose.foundation.background
-import androidx.compose.foundation.layout.*
-import androidx.compose.material.MaterialTheme
-import androidx.compose.material.OutlinedTextField
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
 import androidx.compose.material.Text
-import androidx.compose.runtime.*
+import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
-import androidx.compose.ui.graphics.RectangleShape
-import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import androidx.navigation.NavController
+import com.wbrawner.pihelper.shared.Store
 import com.wbrawner.pihelper.ui.PihelperTheme
-import kotlinx.coroutines.launch
-import java.net.Inet4Address
 
 @Composable
-fun ScanScreen(navController: NavController, addPiHelperViewModel: AddPiHelperViewModel) {
-    val coroutineScope = rememberCoroutineScope()
-    val loadingMessage by addPiHelperViewModel.loadingMessage.collectAsState()
-    val context = LocalContext.current
-    LaunchedEffect(key1 = addPiHelperViewModel) {
-        val onSuccess: () -> Unit = {
-            navController.navigate(Screens.AUTH.route)
-        }
-        val onFailure: () -> Unit = {
-            navController.popBackStack()
-        }
-        if (BuildConfig.DEBUG && Build.MODEL == "Android SDK built for x86") {
-            // For emulators, just begin scanning the host machine directly
-            coroutineScope.launch {
-                addPiHelperViewModel.beginScanning("10.0.2.2", onSuccess, onFailure)
-            }
-            return@LaunchedEffect
-        }
-        (context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager)?.let { connectivityManager ->
-            connectivityManager.allNetworks
-                .filter {
-                    connectivityManager.getNetworkCapabilities(it)
-                        ?.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
-                        ?: false
-                }
-                .forEach { network ->
-                    connectivityManager.getLinkProperties(network)
-                        ?.linkAddresses
-                        ?.filter { !it.address.isLoopbackAddress && it.address is Inet4Address }
-                        ?.forEach { address ->
-                            addPiHelperViewModel.beginScanning(
-                                address.address.hostAddress,
-                                onSuccess,
-                                onFailure
-                            )
-                        }
-                }
-        }
-    }
-    ScanningStatus(loadingMessage)
+fun ScanScreen(store: Store) {
+    ScanningStatus(store.state.value.scanning?.let { "Scanning $it..." })
 }
 
 @Composable
 fun ScanningStatus(
     loadingMessage: String? = null
 ) {
-    val (host: String, setHost: (String) -> Unit) = remember { mutableStateOf("pi.hole") }
     Column(
         modifier = Modifier
             .padding(16.dp)

gradle/libs.versions.toml

@@ -16,6 +16,7 @@ moshi = "1.9.2"
 minSdk = "23"
 navigation = "2.4.1"
 okhttp = "4.2.2"
+settings = "0.8.1"
 versionCode = "1"
 versionName = "1.0"
 
@@ -50,6 +51,7 @@ kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-c
 kotlinx-coroutines-android = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-android", version.ref = "kotlinx-coroutines" }
 kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "kotlinx-serialization" }
 material = { module = "com.google.android.material:material", version.ref = "material" }
+multiplatform-settings = { module = "com.russhwolf:multiplatform-settings-no-arg", version.ref = "settings" }
 moshi-codegen = { module = "com.squareup.moshi:moshi-kotlin-codegen", version.ref = "moshi" }
 moshi-core = { module = "com.squareup.moshi:moshi", version.ref = "moshi" }
 navigation-compose = { module = "androidx.navigation:navigation-compose", version = "navigation" }

shared/build.gradle.kts

@@ -6,11 +6,10 @@ plugins {
 
 kotlin {
     android()
-    listOf(
-        iosX64(),
-        iosArm64(),
-        iosSimulatorArm64()
-    ).forEach {
+    val iosX64 = iosX64()
+    val iosArm64 = iosArm64()
+    val iosSimulatorArm64 = iosSimulatorArm64()
+    listOf(iosX64, iosArm64, iosSimulatorArm64).forEach {
         it.binaries.framework {
             baseName = "Pihelper"
         }
@@ -25,6 +24,7 @@ kotlin {
                 implementation(libs.ktor.client.content.negotiation)
                 implementation(libs.kotlinx.coroutines.core)
                 implementation(libs.kotlinx.serialization.json)
+                api(libs.multiplatform.settings)
             }
         }
 

shared/src/androidMain/kotlin/com/wbrawner/pihelper/shared/Android.kt

@@ -0,0 +1,15 @@
+package com.wbrawner.pihelper.shared
+
+import io.ktor.client.*
+import io.ktor.client.engine.android.*
+import java.math.BigInteger
+import java.security.MessageDigest
+
+fun PiholeAPIService.Companion.create() = KtorPiholeAPIService(HttpClient(Android) {
+    commonConfig()
+})
+
+actual fun String.hash(): String = BigInteger(
+    1,
+    MessageDigest.getInstance("SHA-256").digest(this.toByteArray())
+).toString(16).padStart(64, '0')

shared/src/androidMain/kotlin/com/wbrawner/pihelper/shared/HttpClient.kt

@@ -1,8 +0,0 @@
-package com.wbrawner.pihelper.shared
-
-import io.ktor.client.*
-import io.ktor.client.engine.android.*
-
-fun PiholeAPIService.Companion.create() = KtorPiholeAPIService(HttpClient(Android) {
-    commonConfig()
-})

shared/src/commonMain/kotlin/com/wbrawner/pihelper/shared/PiholeAPIService.kt

@@ -32,6 +32,11 @@ fun <T: HttpClientEngineConfig> HttpClientConfig<T>.commonConfig() {
             isLenient = true
         })
     }
+    install(HttpTimeout) {
+        requestTimeoutMillis = 500
+        connectTimeoutMillis = 500
+        socketTimeoutMillis = 500
+    }
 }
 
 class KtorPiholeAPIService(val httpClient: HttpClient) : PiholeAPIService() {

shared/src/commonMain/kotlin/com/wbrawner/pihelper/shared/Store.kt

@@ -0,0 +1,250 @@
+package com.wbrawner.pihelper.shared
+
+import com.russhwolf.settings.Settings
+import com.russhwolf.settings.get
+import com.russhwolf.settings.set
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+data class State(
+    val apiKey: String? = null,
+    val host: String? = null,
+    val status: Status? = null,
+    val scanning: String? = null,
+    val loading: Boolean = false,
+    val showAbout: Boolean = false,
+)
+
+sealed interface AuthenticationString {
+    val value: String
+
+    data class Password(override val value: String) : AuthenticationString
+    data class Token(override val value: String) : AuthenticationString
+}
+
+sealed interface Action {
+    data class Connect(val host: String) : Action
+    data class Scan(val deviceIp: String) : Action
+    data class Authenticate(val authString: AuthenticationString) : Action
+    object Enable : Action
+    data class Disable(val duration: Long? = null) : Action
+    object Forget : Action
+    object About : Action
+    object Back : Action
+}
+
+sealed interface Effect {
+    object Exit : Effect
+    data class Error(val message: String) : Effect
+    object Empty
+}
+
+const val KEY_HOST = "baseUrl"
+const val KEY_API_KEY = "apiKey"
+
+class Store(
+    private val apiService: PiholeAPIService,
+    private val settings: Settings = Settings(),
+    initialState: State = State()
+) : CoroutineScope by CoroutineScope(Dispatchers.Main) {
+    private val _state = MutableStateFlow(initialState)
+    val state: StateFlow<State> = _state
+    private val _effects = MutableSharedFlow<Effect>()
+    val effects: Flow<Effect> = _effects
+    private var monitorJob: Job? = null
+    private var scanJob: Job? = null
+
+    init {
+        launch {
+            _state.collect {
+                println(it)
+            }
+        }
+        val host: String? = settings[KEY_HOST]
+        val apiKey: String? = settings[KEY_API_KEY]
+        if (!host.isNullOrBlank() && !apiKey.isNullOrBlank()) {
+            apiService.baseUrl = host
+            apiService.apiKey = apiKey
+            _state.value = initialState.copy(
+                host = host,
+                apiKey = apiKey
+            )
+            monitorChanges()
+        } else {
+            launch {
+                connect("pi.hole")
+            }
+        }
+    }
+
+    fun dispatch(action: Action) {
+        when (action) {
+            is Action.Authenticate -> {
+                when (action.authString) {
+                    // The Pi-hole API key is just the web password hashed twice with SHA-256
+                    is AuthenticationString.Password -> authenticate(
+                        action.authString.value.hash().hash()
+                    )
+                    is AuthenticationString.Token -> authenticate(action.authString.value)
+                }
+            }
+            is Action.Connect -> connect(action.host)
+            is Action.Disable -> disable(action.duration)
+            Action.Enable -> enable()
+            Action.Forget -> forget()
+            is Action.Scan -> scan(action.deviceIp)
+            Action.About -> _state.value = _state.value.copy(showAbout = true)
+            Action.Back -> back()
+        }
+    }
+
+    private fun back() {
+        when {
+            _state.value.showAbout -> {
+                _state.value = _state.value.copy(showAbout = false)
+            }
+            _state.value.status != null -> {
+                launch {
+                    _effects.emit(Effect.Exit)
+                }
+            }
+            _state.value.scanning != null -> {
+                _state.value = _state.value.copy(scanning = null)
+                scanJob?.cancel("")
+                scanJob = null
+            }
+            _state.value.apiKey != null -> {
+                _state.value = _state.value.copy(apiKey = null)
+            }
+            _state.value.host != null -> {
+                _state.value = _state.value.copy(host = null)
+            }
+        }
+    }
+
+    private fun forget() {
+        _state.value = State()
+        settings.remove(KEY_HOST)
+        settings.remove(KEY_API_KEY)
+        monitorJob?.cancel("")
+        monitorJob = null
+    }
+
+    private fun scan(startingIp: String) {
+        scanJob = launch {
+            val subnet = startingIp.substringBeforeLast(".")
+            for (i in 0..255) {
+                try {
+                    val ip = "$subnet.$i"
+                    _state.value = _state.value.copy(scanning = ip)
+                    apiService.baseUrl = ip
+                    apiService.getVersion()
+                    _state.value = _state.value.copy(scanning = null)
+                    scanJob = null
+                    return@launch
+                } catch (ignored: Exception) {
+                }
+            }
+            _state.value = _state.value.copy(scanning = null)
+            _effects.emit(Effect.Error("Failed to discover pi-hole on network"))
+            scanJob = null
+        }
+    }
+
+    private fun connect(host: String) {
+        _state.value = _state.value.copy(loading = true)
+        launch {
+            apiService.baseUrl = host
+            try {
+                apiService.getVersion()
+                settings[KEY_HOST] = host
+                _state.value = _state.value.copy(
+                    host = host,
+                    loading = false
+                )
+            } catch (e: Exception) {
+                _state.value = _state.value.copy(loading = false)
+                _effects.emit(Effect.Error(e.message ?: "Failed to connect to $host"))
+            }
+        }
+    }
+
+    private fun authenticate(token: String) {
+        _state.value = _state.value.copy(loading = true)
+        launch {
+            apiService.apiKey = token
+            try {
+                apiService.getTopItems()
+                settings[KEY_API_KEY] = token
+                _state.value = _state.value.copy(
+                    apiKey = token,
+                    loading = false
+                )
+                monitorChanges()
+            } catch (e: Exception) {
+                _state.value = _state.value.copy(loading = false)
+                _effects.emit(Effect.Error(e.message ?: "Unable to authenticate with API key"))
+            }
+        }
+    }
+
+    private fun enable() {
+        val loadingJob = launch {
+            delay(500)
+            _state.value = _state.value.copy(loading = true)
+        }
+        launch {
+            try {
+                apiService.enable()
+                getStatus()
+                loadingJob.cancel("")
+            } catch (e: Exception) {
+                _state.value = _state.value.copy(loading = false)
+                _effects.emit(Effect.Error(e.message ?: "Failed to enable Pi-hole"))
+            }
+        }
+    }
+
+    private fun disable(duration: Long?) {
+        val loadingJob = launch {
+            delay(500)
+            _state.value = _state.value.copy(loading = true)
+        }
+        launch {
+            try {
+                apiService.disable(duration)
+                getStatus()
+                loadingJob.cancel("")
+            } catch (e: Exception) {
+                _state.value = _state.value.copy(loading = false)
+                _effects.emit(Effect.Error(e.message ?: "Failed to disable Pi-hole"))
+            }
+        }
+    }
+
+    private suspend fun getStatus() {
+        // Don't set the state to loading here, otherwise it'll cause blinking animations
+        try {
+            val summary = apiService.getSummary()
+            // TODO: If status is disabled, check for how long
+            _state.value = _state.value.copy(status = summary.status, loading = false)
+        } catch (e: Exception) {
+            _state.value = _state.value.copy(loading = false)
+            _effects.emit(Effect.Error(e.message ?: "Failed to load status"))
+        }
+    }
+
+    private fun monitorChanges() {
+        monitorJob = launch {
+            while (isActive) {
+                getStatus()
+                delay(1000)
+            }
+        }
+    }
+}
+
+expect fun String.hash(): String

shared/src/iosMain/Kotlin/com/wbrawner/pihelper/shared/HttpClient.kt

@@ -1,8 +0,0 @@
-package com.wbrawner.pihelper.shared
-
-import io.ktor.client.*
-import io.ktor.client.engine.darwin.*
-
-fun PiholeAPIService.Companion.create() = KtorPiholeAPIService(HttpClient(Darwin) {
-    commonConfig()
-})

shared/src/iosMain/Kotlin/com/wbrawner/pihelper/shared/iOS.kt

@@ -0,0 +1,23 @@
+package com.wbrawner.pihelper.shared
+
+import io.ktor.client.*
+import io.ktor.client.engine.darwin.*
+import kotlinx.cinterop.addressOf
+import kotlinx.cinterop.convert
+import kotlinx.cinterop.usePinned
+import platform.CoreCrypto.CC_SHA256
+import platform.CoreCrypto.CC_SHA256_DIGEST_LENGTH
+
+fun PiholeAPIService.Companion.create() = KtorPiholeAPIService(HttpClient(Darwin) {
+    commonConfig()
+})
+
+actual fun String.hash(): String {
+    val digest = UByteArray(CC_SHA256_DIGEST_LENGTH)
+    usePinned { inputPinned ->
+        digest.usePinned { digestPinned ->
+            CC_SHA256(inputPinned.addressOf(0), this.length.convert(), digestPinned.addressOf(0))
+        }
+    }
+    return digest.joinToString(separator = "") { it.toString(16) }
+}