[auth][photos] Support for passkey (#435)

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## Description

Passkey implementation (similar will be done in ente Photos)

<!--- Describe your changes in detail -->

## Type of Change

<!--- Put an `x` in all the boxes that apply: -->

- [ ] 🖼️ New icon
- [x] ✨ New feature (non-breaking change which adds functionality)
- [ ] 🛠️ Bug fix (non-breaking change which fixes an issue)
- [ ] ❌ Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] 🧹 Code refactor
- [ ] ✅ Build configuration change
- [ ] 📝 Documentation
- [ ] 🗑️ Chore

auth/android/app/build.gradle

@@ -56,11 +56,11 @@ android {
 
     signingConfigs {
        release {
-           storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : file(System.getenv("SIGNING_KEY_PATH"))
-           keyAlias keystoreProperties['keyAlias'] ? keystoreProperties['keyAlias'] : System.getenv("SIGNING_KEY_ALIAS")
-           keyPassword keystoreProperties['keyPassword'] ? keystoreProperties['keyPassword'] : System.getenv("SIGNING_KEY_PASSWORD")
-           storePassword keystoreProperties['storePassword'] ? keystoreProperties['storePassword'] : System.getenv("SIGNING_STORE_PASSWORD")
-       }
+            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : System.getenv("SIGNING_KEY_PATH") ? file(System.getenv("SIGNING_KEY_PATH")) : null
+            keyAlias keystoreProperties['keyAlias'] ? keystoreProperties['keyAlias'] : System.getenv("SIGNING_KEY_ALIAS")
+            keyPassword keystoreProperties['keyPassword'] ? keystoreProperties['keyPassword'] : System.getenv("SIGNING_KEY_PASSWORD")
+            storePassword keystoreProperties['storePassword'] ? keystoreProperties['storePassword'] : System.getenv("SIGNING_STORE_PASSWORD")
+        }
     }
 
     flavorDimensions "default"

auth/android/app/src/main/AndroidManifest.xml

@@ -35,6 +35,13 @@
                 <data android:scheme="otpauth" />
             </intent-filter>
 
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="enteauth" />
+            </intent-filter>
+
         </activity>
 
         <!-- Don't delete the meta-data below.

auth/ios/Runner/Info.plist

@@ -37,6 +37,7 @@
 			<key>CFBundleURLSchemes</key>
 			<array>
 				<string>otpauth</string>
+				<string>enteauth</string>
 			</array>
 		</dict>
 	</array>

auth/lib/core/network.dart

@@ -76,8 +76,8 @@ class EnteRequestInterceptor extends Interceptor {
   void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
     if (kDebugMode) {
       assert(
-      options.baseUrl == enteEndpoint,
-      "interceptor should only be used for API endpoint",
+        options.baseUrl == enteEndpoint,
+        "interceptor should only be used for API endpoint",
       );
     }
     // ignore: prefer_const_constructors

auth/lib/l10n/arb/app_en.arb

@@ -59,7 +59,7 @@
     }
   },
   "contactSupport": "Contact support",
-  "rateUsOnStore" : "Rate us on {storeName}",
+  "rateUsOnStore": "Rate us on {storeName}",
   "blog": "Blog",
   "merchandise": "Merchandise",
   "verifyPassword": "Verify password",
@@ -133,7 +133,6 @@
   "faq_q_5": "How can I enable FaceID lock in ente Auth",
   "faq_a_5": "You can enable FaceID lock under Settings → Security → Lockscreen.",
   "somethingWentWrongMessage": "Something went wrong, please try again",
-
   "leaveFamily": "Leave family",
   "leaveFamilyMessage": "Are you sure that you want to leave the family plan?",
   "inFamilyPlanMessage": "You are on a family plan!",
@@ -145,6 +144,7 @@
   "enterCodeHint": "Enter the 6-digit code from\nyour authenticator app",
   "lostDeviceTitle": "Lost device?",
   "twoFactorAuthTitle": "Two-factor authentication",
+  "passkeyAuthTitle": "Passkey authentication",
   "recoverAccount": "Recover account",
   "enterRecoveryKeyHint": "Enter your recovery key",
   "recover": "Recover",
@@ -337,10 +337,10 @@
   "offlineModeWarning": "You have chosen to proceed without backups. Please take manual backups to make sure your codes are safe.",
   "showLargeIcons": "Show large icons",
   "shouldHideCode": "Hide codes",
-  "doubleTapToViewHiddenCode" : "You can double tap on an entry to view code",
+  "doubleTapToViewHiddenCode": "You can double tap on an entry to view code",
   "focusOnSearchBar": "Focus search on app start",
   "confirmUpdatingkey": "Are you sure you want to update the secret key?",
-  "minimizeAppOnCopy":  "Minimize app on copy",
+  "minimizeAppOnCopy": "Minimize app on copy",
   "editCodeAuthMessage": "Authenticate to edit code",
   "deleteCodeAuthMessage": "Authenticate to delete code",
   "showQRAuthMessage": "Authenticate to show QR code",
@@ -405,5 +405,8 @@
   "signOutOtherDevices": "Sign out other devices",
   "doNotSignOut": "Do not sign out",
   "hearUsWhereTitle": "How did you hear about Ente? (optional)",
-  "hearUsExplanation": "We don't track app installs. It'd help if you told us where you found us!"
-}
+  "hearUsExplanation": "We don't track app installs. It'd help if you told us where you found us!",
+  "waitingForBrowserRequest": "Waiting for browser request...",
+  "launchPasskeyUrlAgain": "Launch passkey URL again",
+  "passkey": "Passkey"
+}

auth/lib/services/auth_feature_flag.dart

@@ -0,0 +1,23 @@
+import 'package:ente_auth/core/configuration.dart';
+import 'package:flutter/foundation.dart';
+
+class FeatureFlagService {
+  FeatureFlagService._privateConstructor();
+  static final FeatureFlagService instance =
+      FeatureFlagService._privateConstructor();
+
+  static final _internalUserIDs = const String.fromEnvironment(
+    "internal_user_ids",
+    defaultValue: "1,2,3,4,191,125,1580559962388044,1580559962392434,10000025",
+  ).split(",").map((element) {
+    return int.parse(element);
+  }).toSet();
+
+  bool isInternalUserOrDebugBuild() {
+    final String? email = Configuration.instance.getEmail();
+    final userID = Configuration.instance.getUserID();
+    return (email != null && email.endsWith("@ente.io")) ||
+        _internalUserIDs.contains(userID) ||
+        kDebugMode;
+  }
+}

auth/lib/services/passkey_service.dart

@@ -0,0 +1,33 @@
+import 'package:ente_auth/core/network.dart';
+import 'package:ente_auth/utils/dialog_util.dart';
+import 'package:flutter/widgets.dart';
+import 'package:logging/logging.dart';
+import 'package:url_launcher/url_launcher_string.dart';
+
+class PasskeyService {
+  PasskeyService._privateConstructor();
+  static final PasskeyService instance = PasskeyService._privateConstructor();
+
+  final _enteDio = Network.instance.enteDio;
+
+  Future<String> getJwtToken() async {
+    final response = await _enteDio.get(
+      "/users/accounts-token",
+    );
+    return response.data!["accountsToken"] as String;
+  }
+
+  Future<void> openPasskeyPage(BuildContext context) async {
+    try {
+      final jwtToken = await getJwtToken();
+      final url = "https://accounts.ente.io/account-handoff?token=$jwtToken";
+      await launchUrlString(
+        url,
+        mode: LaunchMode.externalApplication,
+      );
+    } catch (e) {
+      Logger('PasskeyService').severe("failed to open passkey page", e);
+      showGenericErrorDialog(context: context).ignore();
+    }
+  }
+}

auth/lib/services/user_service.dart

@@ -26,6 +26,7 @@ import 'package:ente_auth/ui/account/password_reentry_page.dart';
 import 'package:ente_auth/ui/account/recovery_page.dart';
 import 'package:ente_auth/ui/common/progress_dialog.dart';
 import 'package:ente_auth/ui/home_page.dart';
+import 'package:ente_auth/ui/passkey_page.dart';
 import 'package:ente_auth/ui/two_factor_authentication_page.dart';
 import 'package:ente_auth/ui/two_factor_recovery_page.dart';
 import 'package:ente_auth/utils/crypto_util.dart';
@@ -264,6 +265,33 @@ class UserService {
     }
   }
 
+  Future<void> onPassKeyVerified(BuildContext context, Map response) async {
+    final userPassword = Configuration.instance.getVolatilePassword();
+    if (userPassword == null) throw Exception("volatile password is null");
+
+    await _saveConfiguration(response);
+
+    Widget page;
+    if (Configuration.instance.getEncryptedToken() != null) {
+      await Configuration.instance.decryptSecretsAndGetKeyEncKey(
+        userPassword,
+        Configuration.instance.getKeyAttributes()!,
+      );
+      page = const HomePage();
+    } else {
+      throw Exception("unexpected response during passkey verification");
+    }
+
+    Navigator.of(context).pushAndRemoveUntil(
+      MaterialPageRoute(
+        builder: (BuildContext context) {
+          return page;
+        },
+      ),
+      (route) => route.isFirst,
+    );
+  }
+
   Future<void> verifyEmail(
     BuildContext context,
     String ott, {
@@ -487,17 +515,17 @@ class UserService {
         final clientS = client.calculateSecret(serverB);
         final clientM = client.calculateClientEvidenceMessage();
         // ignore: unused_local_variable
-        late Response srpCompleteResponse;
+        late Response _;
         if (setKeysRequest == null) {
-          srpCompleteResponse = await _enteDio.post(
+          _ = await _enteDio.post(
             "/users/srp/complete",
             data: {
               'setupID': setupSRPResponse.setupID,
               'srpM1': base64Encode(SRP6Util.encodeBigInt(clientM!)),
             },
           );
         } else {
-          srpCompleteResponse = await _enteDio.post(
+          _ = await _enteDio.post(
             "/users/srp/update",
             data: {
               'setupID': setupSRPResponse.setupID,
@@ -581,11 +609,15 @@ class UserService {
       },
     );
     if (response.statusCode == 200) {
-      Widget page;
+      Widget? page;
+      final String passkeySessionID = response.data["passkeySessionID"];
       final String twoFASessionID = response.data["twoFactorSessionID"];
       Configuration.instance.setVolatilePassword(userPassword);
+
       if (twoFASessionID.isNotEmpty) {
         page = TwoFactorAuthenticationPage(twoFASessionID);
+      } else if (passkeySessionID.isNotEmpty) {
+        page = PasskeyPage(passkeySessionID);
       } else {
         await _saveConfiguration(response);
         if (Configuration.instance.getEncryptedToken() != null) {
@@ -603,7 +635,7 @@ class UserService {
       Navigator.of(context).pushAndRemoveUntil(
         MaterialPageRoute(
           builder: (BuildContext context) {
-            return page;
+            return page!;
           },
         ),
         (route) => route.isFirst,
@@ -861,16 +893,19 @@ class UserService {
     }
   }
 
-  Future<void> _saveConfiguration(Response response) async {
-    await Configuration.instance.setUserID(response.data["id"]);
-    if (response.data["encryptedToken"] != null) {
+  Future<void> _saveConfiguration(dynamic response) async {
+    final responseData = response is Map ? response : response.data as Map?;
+    if (responseData == null) return;
+
+    await Configuration.instance.setUserID(responseData["id"]);
+    if (responseData["encryptedToken"] != null) {
       await Configuration.instance
-          .setEncryptedToken(response.data["encryptedToken"]);
+          .setEncryptedToken(responseData["encryptedToken"]);
       await Configuration.instance.setKeyAttributes(
-        KeyAttributes.fromMap(response.data["keyAttributes"]),
+        KeyAttributes.fromMap(responseData["keyAttributes"]),
       );
     } else {
-      await Configuration.instance.setToken(response.data["token"]);
+      await Configuration.instance.setToken(responseData["token"]);
     }
   }
 

auth/lib/store/offline_authenticator_db.dart

@@ -15,7 +15,8 @@ class OfflineAuthenticatorDB {
   static const entityTable = 'entities';
 
   OfflineAuthenticatorDB._privateConstructor();
-  static final OfflineAuthenticatorDB instance = OfflineAuthenticatorDB._privateConstructor();
+  static final OfflineAuthenticatorDB instance =
+      OfflineAuthenticatorDB._privateConstructor();
 
   static Future<Database>? _dbFuture;
 
@@ -26,7 +27,7 @@ class OfflineAuthenticatorDB {
 
   Future<Database> _initDatabase() async {
     final Directory documentsDirectory =
-    await getApplicationDocumentsDirectory();
+        await getApplicationDocumentsDirectory();
     final String path = join(documentsDirectory.path, _databaseName);
     debugPrint(path);
     return await openDatabase(
@@ -70,10 +71,10 @@ class OfflineAuthenticatorDB {
   }
 
   Future<int> updateEntry(
-      int generatedID,
-      String encData,
-      String header,
-      ) async {
+    int generatedID,
+    String encData,
+    String header,
+  ) async {
     final db = await instance.database;
     final int timeInMicroSeconds = DateTime.now().microsecondsSinceEpoch;
     int affectedRows = await db.update(