FxA WebChannels integration

This patch includes:
- WebChannels support enabled by default, with ability to disable it via remote flag
- expanded FxA telemetry (closes mozilla-mobile#4971)

Co-authored-by: Arturo Mejia <arturomejiamarmol@gmail.com>

app/metrics.yaml

@@ -816,21 +816,65 @@ sync_auth:
     notification_emails:
       - fenix-core@mozilla.com
     expires: "2020-03-01"
-  scan_pairing:
+  sign_up:
     type: event
     description: >
-      A user pressed the scan pairing button on the sync authentication page
+      User registered a new Firefox Account, and was signed into it
     bugs:
-    - 1190
+      - 4971
     data_reviews:
-    - https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532
+      - https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300
     notification_emails:
-    - fenix-core@mozilla.com
+      - fenix-core@mozilla.com
+    expires: "2020-03-01"
+  paired:
+    type: event
+    description: >
+      User signed into FxA by pairing with a different Firefox browser, using a QR code
+    bugs:
+      - 4971
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2020-03-01"
+  auto_login:
+    type: event
+    description: >
+      User signed into FxA via an account shared from another locally installed Mozilla application (e.g. Fennec)
+    bugs:
+      - 4971
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2020-03-01"
+  recovered:
+    type: event
+    description: >
+      Account manager automatically recovered FxA authentication state without direct user involvement
+    bugs:
+      - 4971
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300
+    notification_emails:
+      - fenix-core@mozilla.com
     expires: "2020-03-01"
-  create_account:
+  other_external:
     type: event
     description: >
-      A user pressed the create account button on the sync authentication page
+      User authenticated via FxA using an unknown mechanism. "Known" mechanisms are currently sign-in, sign-up and pairing
+    bugs:
+      - 4971
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2020-03-01"
+  scan_pairing:
+    type: event
+    description: >
+      A user pressed the scan pairing button on the sync authentication page
     bugs:
     - 1190
     data_reviews:

app/src/main/java/org/mozilla/fenix/AppRequestInterceptor.kt

@@ -25,8 +25,13 @@ class AppRequestInterceptor(private val context: Context) : RequestInterceptor {
         }
 
         adjustTrackingProtection(host, context, session)
-        // Accounts uses interception to check for a "success URL" in the sign-in flow to finalize authentication.
-        return context.components.services.accountsAuthFeature.interceptor.onLoadRequest(session, uri)
+
+        // WebChannel-driven authentication does not require a separate redirect interceptor.
+        return if (context.isInExperiment(Experiments.asFeatureWebChannelsDisabled)) {
+            context.components.services.accountsAuthFeature.interceptor.onLoadRequest(session, uri)
+        } else {
+            null
+        }
     }
 
     private fun adjustTrackingProtection(host: String, context: Context, session: EngineSession) {

app/src/main/java/org/mozilla/fenix/Experiments.kt

@@ -19,6 +19,8 @@ object Experiments {
     val asFeatureSyncDisabled = ExperimentDescriptor("asFeatureSyncDisabled")
     // application services flag to disable Firefox Accounts pairing button.
     val asFeatureFxAPairingDisabled = ExperimentDescriptor("asFeatureFxAPairingDisabled")
+    // application services flag to disable Firefox Accounts WebChannel integration.
+    val asFeatureWebChannelsDisabled = ExperimentDescriptor("asFeatureWebChannelsDisabled")
 }
 
 val Context.app: FenixApplication

app/src/main/java/org/mozilla/fenix/IntentReceiverActivity.kt

@@ -68,6 +68,7 @@ class IntentReceiverActivity : Activity() {
     private fun setIntentActivity(intent: Intent) {
         val openToBrowser = when {
             components.utils.customTabIntentProcessor.matches(intent) -> {
+                // TODO this needs to change: https://github.com/mozilla-mobile/fenix/issues/5225
                 val activityClass = if (intent.hasExtra(EXTRA_AUTH_CUSTOM_TAB)) {
                     AuthCustomTabActivity::class
                 } else {

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -31,6 +31,8 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import mozilla.components.browser.session.Session
 import mozilla.components.browser.session.SessionManager
+import mozilla.components.feature.accounts.FxaCapability
+import mozilla.components.feature.accounts.FxaWebChannelFeature
 import mozilla.components.feature.app.links.AppLinksFeature
 import mozilla.components.feature.contextmenu.ContextMenuFeature
 import mozilla.components.feature.downloads.DownloadsFeature
@@ -49,6 +51,7 @@ import mozilla.components.support.base.feature.BackHandler
 import mozilla.components.support.base.feature.PermissionsFeature
 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper
 import mozilla.components.support.ktx.android.view.exitImmersiveModeIfNeeded
+import org.mozilla.fenix.Experiments
 import org.mozilla.fenix.FeatureFlags
 import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.IntentReceiverActivity
@@ -70,6 +73,7 @@ import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.enterToImmersiveMode
 import org.mozilla.fenix.ext.requireComponents
 import org.mozilla.fenix.ext.settings
+import org.mozilla.fenix.isInExperiment
 import org.mozilla.fenix.quickactionsheet.QuickActionSheetBehavior
 import org.mozilla.fenix.settings.SupportUtils
 import org.mozilla.fenix.theme.ThemeManager
@@ -96,6 +100,7 @@ abstract class BaseBrowserFragment : Fragment(), BackHandler, SessionManager.Obs
     private val sitePermissionsFeature = ViewBoundFeatureWrapper<SitePermissionsFeature>()
     private val fullScreenFeature = ViewBoundFeatureWrapper<FullScreenFeature>()
     private val swipeRefreshFeature = ViewBoundFeatureWrapper<SwipeRefreshFeature>()
+    private val webchannelIntegration = ViewBoundFeatureWrapper<FxaWebChannelFeature>()
 
     var customTabSessionId: String? = null
 
@@ -374,6 +379,20 @@ abstract class BaseBrowserFragment : Fragment(), BackHandler, SessionManager.Obs
                 view.swipeRefresh.setOnChildScrollUpCallback { _, _ -> true }
             }
 
+            if (!requireContext().isInExperiment(Experiments.asFeatureWebChannelsDisabled)) {
+                webchannelIntegration.set(
+                    feature = FxaWebChannelFeature(
+                        requireContext(),
+                        customTabSessionId,
+                        requireComponents.core.engine,
+                        requireComponents.core.sessionManager,
+                        requireComponents.backgroundServices.accountManager
+                    ),
+                    owner = this,
+                    view = view
+                )
+            }
+
             (activity as HomeActivity).updateThemeForSession(session)
         }
     }

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -102,7 +102,6 @@ class BrowserFragment : BaseBrowserFragment(), BackHandler {
         val sessionManager = context.components.core.sessionManager
 
         return super.initializeUI(view)?.also {
-
             readerViewFeature.set(
                 feature = ReaderViewFeature(
                     context,

app/src/main/java/org/mozilla/fenix/components/BackgroundServices.kt

@@ -5,9 +5,7 @@
 package org.mozilla.fenix.components
 
 import android.content.Context
-import android.content.SharedPreferences
 import android.os.Build
-import android.preference.PreferenceManager
 import androidx.lifecycle.ProcessLifecycleOwner
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -55,7 +53,12 @@ class BackgroundServices(
 ) {
     companion object {
         const val CLIENT_ID = "a2270f727f45f648"
-        const val REDIRECT_URL = "https://accounts.firefox.com/oauth/success/$CLIENT_ID"
+
+        fun redirectUrl(context: Context) = if (context.isInExperiment(Experiments.asFeatureWebChannelsDisabled)) {
+            "https://accounts.firefox.com/oauth/success/$CLIENT_ID"
+        } else {
+            "urn:ietf:wg:oauth:2.0:oob:oauth-redirect-webchannel"
+        }
     }
 
     fun defaultDeviceName(context: Context): String = context.getString(
@@ -65,7 +68,7 @@ class BackgroundServices(
         Build.MODEL
     )
 
-    private val serverConfig = ServerConfig.release(CLIENT_ID, REDIRECT_URL)
+    private val serverConfig = ServerConfig.release(CLIENT_ID, redirectUrl(context))
     private val deviceConfig = DeviceConfig(
         name = defaultDeviceName(context),
         type = DeviceType.MOBILE,
@@ -122,6 +125,46 @@ class BackgroundServices(
         }
     }
 
+    private val telemetryAccountObserver = object : AccountObserver {
+        override fun onAuthenticated(account: OAuthAccount, authType: AuthType) {
+            when (authType) {
+                // User signed-in into an existing FxA account.
+                AuthType.Signin ->
+                    context.components.analytics.metrics.track(Event.SyncAuthSignIn)
+
+                // User created a new FxA account.
+                AuthType.Signup ->
+                    context.components.analytics.metrics.track(Event.SyncAuthSignUp)
+
+                // User paired to an existing account via QR code scanning.
+                AuthType.Pairing ->
+                    context.components.analytics.metrics.track(Event.SyncAuthPaired)
+
+                // User signed-in into an FxA account shared from another locally installed app
+                // (e.g. Fennec).
+                AuthType.Shared ->
+                    context.components.analytics.metrics.track(Event.SyncAuthFromShared)
+
+                // Account Manager recovered a broken FxA auth state, without direct user involvement.
+                AuthType.Recovered ->
+                    context.components.analytics.metrics.track(Event.SyncAuthRecovered)
+
+                // User signed-in into an FxA account via unknown means.
+                // Exact mechanism identified by the 'action' param.
+                is AuthType.OtherExternal ->
+                    context.components.analytics.metrics.track(Event.SyncAuthOtherExternal)
+            }
+            // Used by Leanplum as a context variable.
+            context.settings.fxaSignedIn = true
+        }
+
+        override fun onLoggedOut() {
+            context.components.analytics.metrics.track(Event.SyncAuthSignOut)
+            // Used by Leanplum as a context variable.
+            context.settings.fxaSignedIn = false
+        }
+    }
+
     /**
      * When we login/logout of FxA, we need to update our push subscriptions to match the newly
      * logged in account.
@@ -136,32 +179,18 @@ class BackgroundServices(
      * We should have this removed when we are more confident
      * of the send-tab/push feature: https://github.com/mozilla-mobile/fenix/issues/4063
      */
-    private val accountObserver = object : AccountObserver {
+    private val pushAccountObserver = object : AccountObserver {
         override fun onLoggedOut() {
             push.unsubscribeForType(PushType.Services)
-
-            context.components.analytics.metrics.track(Event.SyncAuthSignOut)
-
-            context.settings.fxaSignedIn = false
         }
 
         override fun onAuthenticated(account: OAuthAccount, authType: AuthType) {
             if (authType != AuthType.Existing) {
                 push.subscribeForType(PushType.Services)
             }
-
-            context.components.analytics.metrics.track(Event.SyncAuthSignIn)
-
-            context.settings.fxaSignedIn = true
         }
     }
 
-    private val preferences: SharedPreferences by lazy {
-        PreferenceManager.getDefaultSharedPreferences(
-            context
-        )
-    }
-
     val accountManager = FxaAccountManager(
         context,
         serverConfig,
@@ -174,13 +203,17 @@ class BackgroundServices(
         // See https://github.com/mozilla-mobile/android-components/issues/3732
         setOf("https://identity.mozilla.com/apps/oldsync")
     ).also {
+        // TODO this needs to change once we have a SyncManager
         context.settings.fxaHasSyncedItems = syncConfig?.supportedEngines?.isNotEmpty() ?: false
         it.registerForDeviceEvents(deviceEventObserver, ProcessLifecycleOwner.get(), false)
 
+        // Register a telemetry account observer to keep track of FxA auth metrics.
+        it.register(telemetryAccountObserver)
+
         // Enable push if we have the config.
         if (pushConfig != null) {
-            // Register our account observer so we know how to update our push subscriptions.
-            it.register(accountObserver)
+            // Register the push account observer so we know how to update our push subscriptions.
+            it.register(pushAccountObserver)
 
             val logger = Logger("AutoPushFeature")
 

app/src/main/java/org/mozilla/fenix/components/Components.kt

@@ -16,7 +16,7 @@ class Components(private val context: Context) {
     val backgroundServices by lazy {
         BackgroundServices(context, core.historyStorage, core.bookmarksStorage)
     }
-    val services by lazy { Services(backgroundServices.accountManager) }
+    val services by lazy { Services(context, backgroundServices.accountManager) }
     val core by lazy { Core(context) }
     val search by lazy { Search(context) }
     val useCases by lazy {

app/src/main/java/org/mozilla/fenix/components/Services.kt

@@ -25,12 +25,13 @@ import org.mozilla.fenix.test.Mockable
  */
 @Mockable
 class Services(
+    private val context: Context,
     private val accountManager: FxaAccountManager
 ) {
     val accountsAuthFeature by lazy {
         FirefoxAccountsAuthFeature(
             accountManager,
-            redirectUrl = BackgroundServices.REDIRECT_URL
+            redirectUrl = BackgroundServices.redirectUrl(context)
         ) { context, authUrl ->
             CoroutineScope(Dispatchers.Main).launch {
                 val intent = SupportUtils.createAuthCustomTabIntent(context, authUrl)

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -225,15 +225,27 @@ private val Event.wrapper: EventWrapper<*>?
         is Event.SyncAuthSignIn -> EventWrapper<NoExtraKeys>(
             { SyncAuth.signIn.record(it) }
         )
+        is Event.SyncAuthSignUp -> EventWrapper<NoExtraKeys>(
+            { SyncAuth.signUp.record(it) }
+        )
+        is Event.SyncAuthPaired -> EventWrapper<NoExtraKeys>(
+            { SyncAuth.paired.record(it) }
+        )
+        is Event.SyncAuthOtherExternal -> EventWrapper<NoExtraKeys>(
+            { SyncAuth.otherExternal.record(it) }
+        )
+        is Event.SyncAuthFromShared -> EventWrapper<NoExtraKeys>(
+            { SyncAuth.autoLogin.record(it) }
+        )
+        is Event.SyncAuthRecovered -> EventWrapper<NoExtraKeys>(
+            { SyncAuth.recovered.record(it) }
+        )
         is Event.SyncAuthSignOut -> EventWrapper<NoExtraKeys>(
             { SyncAuth.signOut.record(it) }
         )
         is Event.SyncAuthScanPairing -> EventWrapper<NoExtraKeys>(
             { SyncAuth.scanPairing.record(it) }
         )
-        is Event.SyncAuthCreateAccount -> EventWrapper<NoExtraKeys>(
-            { SyncAuth.createAccount.record(it) }
-        )
         is Event.SyncAccountOpened -> EventWrapper<NoExtraKeys>(
             { SyncAccount.opened.record(it) }
         )

app/src/main/java/org/mozilla/fenix/components/metrics/Metrics.kt

@@ -64,10 +64,14 @@ sealed class Event {
     object LibraryClosed : Event()
     object SyncAuthOpened : Event()
     object SyncAuthClosed : Event()
+    object SyncAuthSignUp : Event()
     object SyncAuthSignIn : Event()
     object SyncAuthSignOut : Event()
     object SyncAuthScanPairing : Event()
-    object SyncAuthCreateAccount : Event()
+    object SyncAuthPaired : Event()
+    object SyncAuthRecovered : Event()
+    object SyncAuthOtherExternal : Event()
+    object SyncAuthFromShared : Event()
     object SyncAccountOpened : Event()
     object SyncAccountClosed : Event()
     object SyncAccountSyncNow : Event()

app/src/main/res/values/preference_keys.xml

@@ -57,7 +57,6 @@
     <string name="pref_key_cached_account" translatable="false">pref_key_cached_account</string>
     <string name="pref_key_sync_pair" translatable="false">pref_key_sync_pair</string>
     <string name="pref_key_sync_sign_in" translatable="false">pref_key_sync_sign_in</string>
-    <string name="pref_key_sync_create_account" translatable="false">pref_key_sync_create_account</string>
     <string name="pref_key_sync_problem" translatable="false">pref_key_sync_problem</string>
     <string name="pref_key_push_project_id" translatable="false">project_id</string>
     <string name="pref_key_fxa_signed_in" translatable="false">pref_key_fxa_signed_in</string>

app/src/test/java/org/mozilla/fenix/components/TestComponents.kt

@@ -13,7 +13,7 @@ class TestComponents(private val context: Context) : Components(context) {
     override val backgroundServices by lazy {
         mockk<BackgroundServices>(relaxed = true)
     }
-    override val services by lazy { Services(backgroundServices.accountManager) }
+    override val services by lazy { Services(context, backgroundServices.accountManager) }
     override val core by lazy { TestCore(context) }
     override val search by lazy { Search(context) }
     override val useCases by lazy {