fix(database, web): Fix exceptions being converted into lowercase (#12661)

* fix(database, web): Fix exception being converted into lowercase

* add tests for exceptions

* add LICENSE

* remove unnecessary line

* fix

* fix

Author: TarekkMA

packages/firebase_database/firebase_database_web/lib/src/utils/exception.dart

@@ -10,25 +10,26 @@ FirebaseException convertFirebaseDatabaseException(Object exception,
     [StackTrace? stackTrace]) {
   final castedJSObject = exception as core_interop.JSError;
   String code = 'unknown';
-  String message = castedJSObject.message?.toDart.toLowerCase() ?? '';
+  String message = castedJSObject.message?.toDart ?? '';
+  String lowerCaseMessage = message.toLowerCase();
 
   // FirebaseWeb SDK for Database has no error codes, so we manually map known
   // messages to known error codes for cross platform consistency.
-  if (message.contains('index not defined')) {
+  if (lowerCaseMessage.contains('index not defined')) {
     code = 'index-not-defined';
-  } else if (message.contains('permission denied') ||
-      message.contains('permission_denied')) {
+  } else if (lowerCaseMessage.contains('permission denied') ||
+      lowerCaseMessage.contains('permission_denied')) {
     code = 'permission-denied';
-  } else if (message
+  } else if (lowerCaseMessage
       .contains('transaction needs to be run again with current data')) {
     code = 'data-stale';
-  } else if (message.contains('transaction had too many retries')) {
+  } else if (lowerCaseMessage.contains('transaction had too many retries')) {
     code = 'max-retries';
-  } else if (message.contains('service is unavailable')) {
+  } else if (lowerCaseMessage.contains('service is unavailable')) {
     code = 'unavailable';
-  } else if (message.contains('network error')) {
+  } else if (lowerCaseMessage.contains('network error')) {
     code = 'network-error';
-  } else if (message.contains('write was canceled')) {
+  } else if (lowerCaseMessage.contains('write was canceled')) {
     code = 'write-cancelled';
   }
 

tests/integration_test/firebase_database/firebase_database_e2e_test.dart

@@ -11,6 +11,7 @@ import 'package:tests/firebase_options.dart';
 import 'data_snapshot_e2e.dart';
 import 'database_e2e.dart';
 import 'database_reference_e2e.dart';
+import 'web_only_stub.dart' if (dart.library.js_interop) 'web_only.dart';
 import 'firebase_database_configuration_e2e.dart';
 import 'query_e2e.dart';
 
@@ -42,6 +43,7 @@ void main() {
     setupDatabaseReferenceTests();
     setupQueryTests();
     setupDataSnapshotTests();
+    setupWebOnlyTests();
     // TODO(ehesp): Fix broken tests
     // runOnDisconnectTests();
   });

tests/integration_test/firebase_database/web_only.dart

@@ -0,0 +1,54 @@
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:js_interop';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:firebase_database_web/firebase_database_web.dart';
+
+void setupWebOnlyTests() {
+  group(
+    'web',
+    () {
+      test('convertFirebaseDatabaseException', () {
+        Object jsErr(String? message) {
+          return {
+            'message': message,
+          }.jsify()! as Object;
+        }
+
+        final cases = [
+          ['Capital small', 'unknown'],
+          [null, 'unknown'],
+          ['Index not defined', 'index-not-defined'],
+        ];
+
+        for (var i = 0; i < cases.length; i++) {
+          final message = cases[i][0];
+          final convertedCode = cases[i][1];
+          var converted = convertFirebaseDatabaseException(jsErr(message));
+
+          expect(
+            converted.message,
+            message ?? '',
+            reason: '[$i] Failed message check',
+          );
+          expect(
+            converted.code,
+            convertedCode,
+            reason: '[$i] Failed code check',
+          );
+          expect(
+            converted.plugin,
+            'firebase_database',
+            reason: '[$i] Failed plugin check',
+          );
+        }
+      });
+    },
+    skip: !kIsWeb,
+  );
+}

tests/integration_test/firebase_database/web_only_stub.dart

@@ -0,0 +1,7 @@
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/// Used for non web platforms
+void setupWebOnlyTests() {
+}