Simplify password connections

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

@@ -6,15 +6,11 @@ import androidx.core.content.edit
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import com.wbrawner.piholeclient.PiHoleApiService
-import com.wbrawner.piholeclient.Summary
 import com.wbrawner.piholeclient.VersionResponse
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
 import java.net.ConnectException
 import java.net.SocketTimeoutException
-import java.util.regex.Pattern
-import java.util.regex.Pattern.DOTALL
 
 const val KEY_BASE_URL = "baseUrl"
 const val KEY_API_KEY = "apiKey"
@@ -56,7 +52,9 @@ class AddPiHelperViewModel(
     suspend fun beginScanning(deviceIpAddress: String) {
         val addressParts = deviceIpAddress.split(".").toMutableList()
         var chunks = 1
-        val ipAddresses = mutableListOf<String>()
+        // 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) {
@@ -111,16 +109,8 @@ class AddPiHelperViewModel(
     }
 
     suspend fun authenticateWithPassword(password: String) {
-        // Perform the login to get the PHPSESSID cookie set
-        apiService.login(password)
-        val html = apiService.getApiToken()
-        val matcher = Pattern.compile(".*Raw API Token: ([a-z0-9]+).*", DOTALL)
-            .matcher(html)
-        if (!matcher.matches()) {
-            throw RuntimeException("Unable to retrieve API token from password")
-        }
-        val apiToken = matcher.group(1)!!
-        authenticateWithApiKey(apiToken)
+        // The Pi-hole API key is just the web password hashed twice with SHA-256
+        authenticateWithApiKey(password.hash().hash())
     }
 
     suspend fun authenticateWithApiKey(apiKey: String) {

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

@@ -1,3 +1,9 @@
 package com.wbrawner.pihelper
 
-fun <T, R> R.transform(block: (R) -> T): T = block(this)
+import java.math.BigInteger
+import java.security.MessageDigest
+
+fun String.hash(): String = BigInteger(
+    1,
+    MessageDigest.getInstance("SHA-256").digest(this.toByteArray())
+).toString(16)

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

@@ -15,12 +15,11 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import androidx.navigation.fragment.findNavController
 import com.wbrawner.pihelper.MainActivity.Companion.ACTION_FORGET_PIHOLE
-import kotlinx.android.synthetic.main.fragment_main.toolbar
 import kotlinx.android.synthetic.main.fragment_info.*
+import kotlinx.android.synthetic.main.fragment_main.toolbar
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import org.koin.android.ext.android.inject
-import java.lang.RuntimeException
 import kotlin.coroutines.CoroutineContext
 
 class InfoFragment : Fragment(), CoroutineScope {
@@ -30,7 +29,6 @@ class InfoFragment : Fragment(), CoroutineScope {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setHasOptionsMenu(true)
-        throw RuntimeException("I crashed!")
     }
 
     override fun onCreateView(

piholeclient/src/main/java/com/wbrawner/piholeclient/PiHoleApiService.kt

@@ -4,20 +4,14 @@ import com.squareup.moshi.Moshi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import okhttp3.HttpUrl
-import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import okhttp3.RequestBody.Companion.toRequestBody
 import kotlin.reflect.KClass
 
 interface PiHoleApiService {
     var baseUrl: String?
     var apiKey: String?
 
-    suspend fun login(password: String): String
-
-    suspend fun getApiToken(): String
-
     suspend fun getSummary(
         version: Boolean = false,
         type: Boolean = false
@@ -48,8 +42,6 @@ interface PiHoleApiService {
 }
 
 const val BASE_PATH = "/admin/api.php"
-const val INDEX_PATH = "/admin/index.php"
-const val API_TOKEN_PATH = "/admin/scripts/pi-hole/php/api_token.php"
 
 class OkHttpPiHoleApiService(
     private val okHttpClient: OkHttpClient,
@@ -110,26 +102,6 @@ class OkHttpPiHoleApiService(
         return sendRequest(request.build(), TopItemsResponse::class)!!
     }
 
-    override suspend fun login(password: String): String {
-        val url = urlBuilder
-            .encodedPath(INDEX_PATH)
-            .addQueryParameter("login", "")
-        val body = "pw=$password".toRequestBody("application/x-www-form-urlencoded".toMediaType())
-        val request = Request.Builder()
-            .post(body)
-            .url(url.build())
-        return sendRequest(request.build(), String::class)!!
-    }
-
-    override suspend fun getApiToken(): String {
-        val url = urlBuilder
-            .encodedPath(API_TOKEN_PATH)
-        val request = Request.Builder()
-            .get()
-            .url(url.build())
-        return sendRequest(request.build(), String::class)!!
-    }
-
     override suspend fun enable(): StatusResponse {
         val apiToken = this.apiKey ?: throw java.lang.IllegalStateException("No API Token provided")
         val url = urlBuilder