implement Tesla Login for Android Auto/AAOS

app/src/main/AndroidManifest.xml

@@ -289,6 +289,10 @@
                 android:resource="@xml/shortcuts" />
         </activity>
 
+        <activity android:name=".auto.OAuthLoginActivity">
+
+        </activity>
+
         <service
             android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"
             android:enabled="false"

app/src/main/java/net/vonforst/evmap/api/availability/TeslaAvailabilityDetector.kt

@@ -1,5 +1,6 @@
 package net.vonforst.evmap.api.availability
 
+import android.net.Uri
 import android.util.Base64
 import com.squareup.moshi.FromJson
 import com.squareup.moshi.Json
@@ -102,6 +103,18 @@ interface TeslaAuthenticationApi {
                 Base64.URL_SAFE or Base64.NO_WRAP or Base64.NO_PADDING
             )
         }
+
+        fun buildSignInUri(codeChallenge: String): Uri =
+            Uri.parse("https://auth.tesla.com/oauth2/v3/authorize").buildUpon()
+                .appendQueryParameter("client_id", "ownerapi")
+                .appendQueryParameter("code_challenge", codeChallenge)
+                .appendQueryParameter("code_challenge_method", "S256")
+                .appendQueryParameter("redirect_uri", "https://auth.tesla.com/void/callback")
+                .appendQueryParameter("response_type", "code")
+                .appendQueryParameter("scope", "openid email offline_access")
+                .appendQueryParameter("state", "123").build()
+
+        val resultUrlPrefix = "https://auth.tesla.com/void/callback"
     }
 }
 

app/src/main/java/net/vonforst/evmap/auto/ChargerDetailScreen.kt

@@ -311,7 +311,7 @@ class ChargerDetailScreen(ctx: CarContext, val chargerSparse: ChargeLocation) :
                 addText(charger.amenities)
             }.build())
         }
-        if (rows.count() < maxRows && (fronyxSupported || teslaSupported)) {
+        if (rows.count() < maxRows && ((fronyxSupported && prefs.predictionEnabled) || teslaSupported)) {
             rows.add(1, Row.Builder().apply {
                 setTitle(
                     if (fronyxSupported) {

app/src/main/java/net/vonforst/evmap/auto/OAuthLoginActivity.kt

@@ -0,0 +1,31 @@
+package net.vonforst.evmap.auto
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.add
+import androidx.fragment.app.commit
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import net.vonforst.evmap.R
+import net.vonforst.evmap.fragment.oauth.OAuthLoginFragment
+
+class OAuthLoginActivity : AppCompatActivity(R.layout.activity_oauth_login) {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        if (savedInstanceState == null) {
+            supportFragmentManager.commit {
+                setReorderingAllowed(true)
+                add<OAuthLoginFragment>(R.id.fragment_container_view, args = intent.extras)
+            }
+        }
+
+        LocalBroadcastManager.getInstance(this).registerReceiver(object : BroadcastReceiver() {
+            override fun onReceive(ctx: Context, intent: Intent) {
+                finish()
+            }
+        }, IntentFilter(OAuthLoginFragment.ACTION_OAUTH_RESULT))
+    }
+}

app/src/main/java/net/vonforst/evmap/auto/SettingsScreens.kt

@@ -1,10 +1,15 @@
 package net.vonforst.evmap.auto
 
+import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
+import android.content.IntentFilter
 import android.content.pm.PackageManager.NameNotFoundException
 import android.hardware.Sensor
 import android.hardware.SensorManager
+import android.net.Uri
+import android.os.Bundle
+import android.os.IInterface
 import android.text.Html
 import androidx.annotation.StringRes
 import androidx.car.app.CarContext
@@ -13,16 +18,27 @@ import androidx.car.app.Screen
 import androidx.car.app.annotations.ExperimentalCarApi
 import androidx.car.app.constraints.ConstraintManager
 import androidx.car.app.model.*
+import androidx.core.content.IntentCompat
 import androidx.core.graphics.drawable.IconCompat
 import androidx.core.text.HtmlCompat
 import androidx.lifecycle.lifecycleScope
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import com.google.android.material.snackbar.Snackbar
 import kotlinx.coroutines.launch
 import net.vonforst.evmap.*
+import net.vonforst.evmap.api.availability.TeslaAuthenticationApi
+import net.vonforst.evmap.api.availability.TeslaOwnerApi
 import net.vonforst.evmap.api.chargeprice.ChargepriceApi
 import net.vonforst.evmap.api.chargeprice.ChargepriceCar
 import net.vonforst.evmap.api.chargeprice.ChargepriceTariff
+import net.vonforst.evmap.fragment.oauth.OAuthLoginFragment
+import net.vonforst.evmap.fragment.oauth.OAuthLoginFragmentArgs
 import net.vonforst.evmap.storage.AppDatabase
+import net.vonforst.evmap.storage.EncryptedPreferenceDataStore
 import net.vonforst.evmap.storage.PreferenceDataSource
+import okhttp3.OkHttpClient
+import java.io.IOException
+import java.time.Instant
 import kotlin.math.max
 import kotlin.math.min
 
@@ -125,6 +141,7 @@ class SettingsScreen(ctx: CarContext, val session: EVMapSession) : Screen(ctx) {
 
 class DataSettingsScreen(ctx: CarContext) : Screen(ctx) {
     val prefs = PreferenceDataSource(ctx)
+    val encryptedPrefs = EncryptedPreferenceDataStore(ctx)
     val db = AppDatabase.getInstance(ctx)
 
     val dataSourceNames = carContext.resources.getStringArray(R.array.pref_data_source_names)
@@ -134,6 +151,8 @@ class DataSettingsScreen(ctx: CarContext) : Screen(ctx) {
     val searchProviderValues =
         carContext.resources.getStringArray(R.array.pref_search_provider_values)
 
+    var teslaLoggingIn = false
+
     override fun onGetTemplate(): Template {
         return ListTemplate.Builder().apply {
             setTitle(carContext.getString(R.string.settings_data_sources))
@@ -183,9 +202,122 @@ class DataSettingsScreen(ctx: CarContext) : Screen(ctx) {
                         }
                     }
                 }.build())
+                addItem(
+                    Row.Builder()
+                        .setTitle(carContext.getString(R.string.pref_prediction_enabled))
+                        .addText(carContext.getString(R.string.pref_prediction_enabled_summary))
+                        .setToggle(Toggle.Builder {
+                            prefs.predictionEnabled = it
+                        }.setChecked(prefs.predictionEnabled).build())
+                        .build()
+                )
+                addItem(Row.Builder().apply {
+                    setTitle(carContext.getString(R.string.pref_tesla_account))
+                    addText(
+                        if (encryptedPrefs.teslaRefreshToken != null) {
+                            carContext.getString(
+                                R.string.pref_tesla_account_enabled,
+                                encryptedPrefs.teslaEmail
+                            )
+                        } else if (teslaLoggingIn) {
+                            carContext.getString(R.string.logging_in)
+                        } else {
+                            carContext.getString(R.string.pref_tesla_account_disabled)
+                        }
+                    )
+                    if (encryptedPrefs.teslaRefreshToken != null) {
+                        setOnClickListener {
+                            teslaLogout()
+                        }
+                    } else {
+                        setOnClickListener(ParkedOnlyOnClickListener.create {
+                            teslaLogin()
+                        })
+                    }
+                }.build())
             }.build())
         }.build()
     }
+
+    private fun teslaLogin() {
+        val codeVerifier = TeslaAuthenticationApi.generateCodeVerifier()
+        val codeChallenge = TeslaAuthenticationApi.generateCodeChallenge(codeVerifier)
+        val uri = TeslaAuthenticationApi.buildSignInUri(codeChallenge)
+
+        val args = OAuthLoginFragmentArgs(
+            uri.toString(),
+            TeslaAuthenticationApi.resultUrlPrefix,
+            "#000000"
+        ).toBundle()
+        val intent = Intent(carContext, OAuthLoginActivity::class.java)
+            .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            .putExtras(args)
+
+        LocalBroadcastManager.getInstance(carContext)
+            .registerReceiver(object : BroadcastReceiver() {
+                override fun onReceive(ctx: Context, intent: Intent) {
+                    val url = IntentCompat.getParcelableExtra(
+                        intent,
+                        OAuthLoginFragment.EXTRA_URL,
+                        Uri::class.java
+                    )
+                    teslaGetAccessToken(url!!, codeVerifier)
+                }
+            }, IntentFilter(OAuthLoginFragment.ACTION_OAUTH_RESULT))
+
+        carContext.startActivity(intent)
+
+        if (BuildConfig.FLAVOR_automotive != "automotive") {
+            CarToast.makeText(
+                carContext,
+                R.string.opened_on_phone,
+                CarToast.LENGTH_LONG
+            ).show()
+        }
+    }
+
+    private fun teslaGetAccessToken(url: Uri, codeVerifier: String) {
+        teslaLoggingIn = true
+        invalidate()
+
+        val code = url.getQueryParameter("code") ?: return
+        val okhttp = OkHttpClient.Builder().addDebugInterceptors().build()
+        val request = TeslaAuthenticationApi.AuthCodeRequest(code, codeVerifier)
+        lifecycleScope.launch {
+            try {
+                val time = Instant.now().epochSecond
+                val response =
+                    TeslaAuthenticationApi.create(okhttp).getToken(request)
+                val userResponse =
+                    TeslaOwnerApi.create(okhttp, response.accessToken).getUserInfo()
+
+                encryptedPrefs.teslaEmail = userResponse.response.email
+                encryptedPrefs.teslaAccessToken = response.accessToken
+                encryptedPrefs.teslaAccessTokenExpiry = time + response.expiresIn
+                encryptedPrefs.teslaRefreshToken = response.refreshToken
+            } catch (e: IOException) {
+                CarToast.makeText(
+                    carContext,
+                    R.string.generic_connection_error,
+                    CarToast.LENGTH_SHORT
+                ).show()
+            } finally {
+                teslaLoggingIn = false
+            }
+            invalidate()
+        }
+    }
+
+    private fun teslaLogout() {
+        // sign out
+        encryptedPrefs.teslaRefreshToken = null
+        encryptedPrefs.teslaAccessToken = null
+        encryptedPrefs.teslaAccessTokenExpiry = -1
+        encryptedPrefs.teslaEmail = null
+        CarToast.makeText(carContext, R.string.logged_out, CarToast.LENGTH_SHORT).show()
+
+        invalidate()
+    }
 }
 
 class ChooseDataSourceScreen(

app/src/main/java/net/vonforst/evmap/fragment/oauth/OAuthLoginFragment.kt

@@ -1,6 +1,7 @@
 package net.vonforst.evmap.fragment.oauth
 
 import android.annotation.SuppressLint
+import android.content.Intent
 import android.graphics.Bitmap
 import android.graphics.Color
 import android.net.Uri
@@ -13,17 +14,25 @@ import android.webkit.CookieManager
 import android.webkit.WebResourceRequest
 import android.webkit.WebView
 import android.webkit.WebViewClient
+import androidx.appcompat.content.res.AppCompatResources
 import androidx.appcompat.widget.Toolbar
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.setFragmentResult
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import androidx.navigation.fragment.findNavController
 import androidx.navigation.ui.setupWithNavController
 import com.google.android.material.progressindicator.LinearProgressIndicator
 import com.google.android.material.transition.MaterialSharedAxis
 import net.vonforst.evmap.MapsActivity
 import net.vonforst.evmap.R
+import java.lang.IllegalStateException
 
 class OAuthLoginFragment : Fragment() {
+    companion object {
+        val ACTION_OAUTH_RESULT = "oauth_result"
+        val EXTRA_URL = "url"
+    }
+
     private lateinit var webView: WebView
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -43,10 +52,24 @@ class OAuthLoginFragment : Fragment() {
         super.onViewCreated(view, savedInstanceState)
 
         val toolbar = view.findViewById<Toolbar>(R.id.toolbar)
-        toolbar.setupWithNavController(
-            findNavController(),
-            (requireActivity() as MapsActivity).appBarConfiguration
-        )
+        val navController = try {
+            findNavController()
+        } catch (e: IllegalStateException) {
+            null
+            // standalone in OAuthLoginActivity
+        }
+
+        if (navController != null) {
+            toolbar.setupWithNavController(
+                navController,
+                (requireActivity() as MapsActivity).appBarConfiguration
+            )
+        } else {
+            toolbar.title = getString(R.string.login)
+            toolbar.navigationIcon =
+                AppCompatResources.getDrawable(requireContext(), R.drawable.ic_arrow_back)
+            toolbar.setNavigationOnClickListener { requireActivity().onBackPressed() }
+        }
 
         val args = OAuthLoginFragmentArgs.fromBundle(requireArguments())
         val uri = Uri.parse(args.url)
@@ -68,7 +91,12 @@ class OAuthLoginFragment : Fragment() {
                     val result = Bundle()
                     result.putString("url", url.toString())
                     setFragmentResult(args.url, result)
-                    findNavController().popBackStack()
+                    context?.let {
+                        LocalBroadcastManager.getInstance(it).sendBroadcast(
+                            Intent(ACTION_OAUTH_RESULT).putExtra(EXTRA_URL, url)
+                        )
+                    }
+                    navController?.popBackStack()
                 }
 
                 return url.host != uri.host

app/src/main/java/net/vonforst/evmap/fragment/preference/DataSettingsFragment.kt

@@ -141,18 +141,11 @@ class DataSettingsFragment : BaseSettingsFragment() {
     private fun teslaLogin() {
         val codeVerifier = TeslaAuthenticationApi.generateCodeVerifier()
         val codeChallenge = TeslaAuthenticationApi.generateCodeChallenge(codeVerifier)
-        val uri = Uri.parse("https://auth.tesla.com/oauth2/v3/authorize").buildUpon()
-            .appendQueryParameter("client_id", "ownerapi")
-            .appendQueryParameter("code_challenge", codeChallenge)
-            .appendQueryParameter("code_challenge_method", "S256")
-            .appendQueryParameter("redirect_uri", "https://auth.tesla.com/void/callback")
-            .appendQueryParameter("response_type", "code")
-            .appendQueryParameter("scope", "openid email offline_access")
-            .appendQueryParameter("state", "123").build()
+        val uri = TeslaAuthenticationApi.buildSignInUri(codeChallenge)
 
         val args = OAuthLoginFragmentArgs(
             uri.toString(),
-            "https://auth.tesla.com/void/callback",
+            TeslaAuthenticationApi.resultUrlPrefix,
             "#000000"
         ).toBundle()
 
@@ -184,7 +177,8 @@ class DataSettingsFragment : BaseSettingsFragment() {
                 encryptedPrefs.teslaRefreshToken = response.refreshToken
             } catch (e: IOException) {
                 view?.let {
-                    Snackbar.make(it, R.string.connection_error, Snackbar.LENGTH_SHORT).show()
+                    Snackbar.make(it, R.string.generic_connection_error, Snackbar.LENGTH_SHORT)
+                        .show()
                 }
             }
             refreshTeslaAccountStatus()

app/src/main/java/net/vonforst/evmap/storage/PreferenceDataSource.kt

@@ -261,8 +261,11 @@ class PreferenceDataSource(val context: Context) {
             sp.edit().putBoolean("show_chargers_ahead_android_auto", value).apply()
         }
 
-    val predictionEnabled: Boolean
+    var predictionEnabled: Boolean
         get() = sp.getBoolean("prediction_enabled", true)
+        set(value) {
+            sp.edit().putBoolean("prediction_enabled", value).apply()
+        }
 
     var developerModeEnabled: Boolean
         get() = sp.getBoolean("dev_mode_enabled", false)

app/src/main/res/layout/activity_oauth_login.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.fragment.app.FragmentContainerView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/fragment_container_view"
+    android:layout_height="match_parent"
+    android:layout_width="match_parent"
+    android:fitsSystemWindows="true" />