Add Lastpass Authenticator import

lib/l10n/arb/app_en.arb

@@ -90,6 +90,7 @@
   "importBitwardenGuide": "Use the \"Export vault\" option within Bitwarden Tools and import the unencrypted JSON file.",
   "importAegisGuide": "Use the \"Export the vault\" option in Aegis's Settings.\n\nIf your vault is encrypted, you will need to enter vault password to decrypt the vault.",
   "import2FasGuide": "Use the \"Settings->Backup -Export\" option in 2FAS.\n\nIf your backup is encrypted, you will need to enter the password to decrypt the backup",
+  "importLastpassGuide": "Use the \"Transfer accounts\" option within Lastpass Authenticator Settings and press \"Export accounts to file\". Import the JSON downloaded.",
   "exportCodes": "Export codes",
   "importLabel": "Import",
   "importInstruction": "Please select a file that contains a list of your codes in the following format",

lib/ui/settings/data/import/import_service.dart

@@ -5,6 +5,7 @@ import 'package:ente_auth/ui/settings/data/import/encrypted_ente_import.dart';
 import 'package:ente_auth/ui/settings/data/import/google_auth_import.dart';
 import 'package:ente_auth/ui/settings/data/import/plain_text_import.dart';
 import 'package:ente_auth/ui/settings/data/import/raivo_plain_text_import.dart';
+import 'package:ente_auth/ui/settings/data/import/lastpass_import.dart';
 import 'package:ente_auth/ui/settings/data/import_page.dart';
 import 'package:flutter/cupertino.dart';
 
@@ -39,6 +40,9 @@ class ImportService {
       case ImportType.bitwarden:
         showBitwardenImportInstruction(context);
         break;
+      case ImportType.lastpass:
+        showLastpassImportInstruction(context);
+        break;
     }
   }
 }

lib/ui/settings/data/import/lastpass_import.dart

@@ -0,0 +1,102 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:ente_auth/l10n/l10n.dart';
+import 'package:ente_auth/models/code.dart';
+import 'package:ente_auth/services/authenticator_service.dart';
+import 'package:ente_auth/store/code_store.dart';
+import 'package:ente_auth/ui/components/buttons/button_widget.dart';
+import 'package:ente_auth/ui/components/dialog_widget.dart';
+import 'package:ente_auth/ui/components/models/button_type.dart';
+import 'package:ente_auth/ui/settings/data/import/import_success.dart';
+import 'package:ente_auth/utils/dialog_util.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+Future<void> showLastpassImportInstruction(BuildContext context) async {
+  final l10n = context.l10n;
+  final result = await showDialogWidget(
+    context: context,
+    title: l10n.importFromApp("LastPass"),
+    body: l10n.importLastpassGuide,
+    buttons: [
+      ButtonWidget(
+        buttonType: ButtonType.primary,
+        labelText: l10n.importSelectJsonFile,
+        isInAlert: true,
+        buttonSize: ButtonSize.large,
+        buttonAction: ButtonAction.first,
+      ),
+      ButtonWidget(
+        buttonType: ButtonType.secondary,
+        labelText: context.l10n.cancel,
+        buttonSize: ButtonSize.large,
+        isInAlert: true,
+        buttonAction: ButtonAction.second,
+      ),
+    ],
+  );
+  if (result?.action != null && result!.action != ButtonAction.cancel) {
+    if (result.action == ButtonAction.first) {
+      await _pickLastpassJsonFile(context);
+    }
+  }
+}
+
+Future<void> _pickLastpassJsonFile(BuildContext context) async {
+  final l10n = context.l10n;
+  FilePickerResult? result = await FilePicker.platform.pickFiles();
+  if (result == null) {
+    return;
+  }
+  final progressDialog = createProgressDialog(context, l10n.pleaseWait);
+  await progressDialog.show();
+  try {
+    String path = result.files.single.path!;
+    int? count = await _processLastpassExportFile(context, path);
+    await progressDialog.hide();
+    if (count != null) {
+      await importSuccessDialog(context, count);
+    }
+  } catch (e) {
+    await progressDialog.hide();
+    await showErrorDialog(
+      context,
+      context.l10n.sorry,
+      context.l10n.importFailureDesc,
+    );
+  }
+}
+
+Future<int?> _processLastpassExportFile(
+  BuildContext context,
+  String path,
+) async {
+  File file = File(path);
+  final jsonString = await file.readAsString();
+  Map<String, dynamic> jsonData = json.decode(jsonString);
+  List<dynamic> accounts = jsonData["accounts"];
+  final parsedCodes = [];
+  for (var item in accounts) {
+    var algorithm = item['algorithm'];
+    var timer = item['timeStep'];
+    var digits = item['digits'];
+    var issuer = item['issuerName'];
+    var secret = item['secret'];
+    var account = item['userName'];
+
+    // Build the OTP URL
+    String otpUrl =
+          'otpauth://totp/$issuer:$account?secret=$secret&issuer=$issuer&algorithm=$algorithm&digits=$digits&period=$timer';
+    parsedCodes.add(Code.fromRawData(otpUrl));
+  }
+
+  for (final code in parsedCodes) {
+    await CodeStore.instance.addCode(code, shouldSync: false);
+  }
+  unawaited(AuthenticatorService.instance.onlineSync());
+  int count = parsedCodes.length;
+  return count;
+}

lib/ui/settings/data/import_page.dart

@@ -17,6 +17,7 @@ enum ImportType {
   aegis,
   twoFas,
   bitwarden,
+  lastpass,
 }
 
 class ImportCodePage extends StatelessWidget {
@@ -28,6 +29,7 @@ class ImportCodePage extends StatelessWidget {
     ImportType.bitwarden,
     ImportType.googleAuthenticator,
     ImportType.ravio,
+    ImportType.lastpass,
   ];
 
   ImportCodePage({super.key});
@@ -48,6 +50,8 @@ class ImportCodePage extends StatelessWidget {
         return '2FAS Authenticator';
       case ImportType.bitwarden:
         return 'Bitwarden';
+      case ImportType.lastpass:
+        return 'LastPass Authenticator';
     }
   }