[url_launcher] Convert Windows to Pigeon (flutter#6991)

* Initial definition matching current API

* Rename, autoformat

* Update native implementation and unit tests

* Update Dart; remove unnecessary Pigeon test API

* Version bump

* autoformat

* Adjust mock API setup

* Improve comment

packages/url_launcher/url_launcher_windows/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 3.0.3
 
+* Converts internal implentation to Pigeon.
 * Updates minimum Flutter version to 3.0.
 
 ## 3.0.2

packages/url_launcher/url_launcher_windows/lib/src/messages.g.dart

@@ -0,0 +1,71 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Autogenerated from Pigeon (v5.0.1), do not edit directly.
+// See also: https://pub.dev/packages/pigeon
+// ignore_for_file: public_member_api_docs, non_constant_identifier_names, avoid_as, unused_import, unnecessary_parenthesis, prefer_null_aware_operators, omit_local_variable_types, unused_shown_name, unnecessary_import
+import 'dart:async';
+import 'dart:typed_data' show Float64List, Int32List, Int64List, Uint8List;
+
+import 'package:flutter/foundation.dart' show ReadBuffer, WriteBuffer;
+import 'package:flutter/services.dart';
+
+class UrlLauncherApi {
+  /// Constructor for [UrlLauncherApi].  The [binaryMessenger] named argument is
+  /// available for dependency injection.  If it is left null, the default
+  /// BinaryMessenger will be used which routes to the host platform.
+  UrlLauncherApi({BinaryMessenger? binaryMessenger})
+      : _binaryMessenger = binaryMessenger;
+  final BinaryMessenger? _binaryMessenger;
+
+  static const MessageCodec<Object?> codec = StandardMessageCodec();
+
+  Future<bool> canLaunchUrl(String arg_url) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.UrlLauncherApi.canLaunchUrl', codec,
+        binaryMessenger: _binaryMessenger);
+    final List<Object?>? replyList =
+        await channel.send(<Object?>[arg_url]) as List<Object?>?;
+    if (replyList == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyList.length > 1) {
+      throw PlatformException(
+        code: replyList[0]! as String,
+        message: replyList[1] as String?,
+        details: replyList[2],
+      );
+    } else if (replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyList[0] as bool?)!;
+    }
+  }
+
+  Future<void> launchUrl(String arg_url) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.UrlLauncherApi.launchUrl', codec,
+        binaryMessenger: _binaryMessenger);
+    final List<Object?>? replyList =
+        await channel.send(<Object?>[arg_url]) as List<Object?>?;
+    if (replyList == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyList.length > 1) {
+      throw PlatformException(
+        code: replyList[0]! as String,
+        message: replyList[1] as String?,
+        details: replyList[2],
+      );
+    } else {
+      return;
+    }
+  }
+}

packages/url_launcher/url_launcher_windows/lib/url_launcher_windows.dart

@@ -2,17 +2,21 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:async';
-
-import 'package:flutter/services.dart';
+import 'package:flutter/foundation.dart';
 import 'package:url_launcher_platform_interface/link.dart';
 import 'package:url_launcher_platform_interface/url_launcher_platform_interface.dart';
 
-const MethodChannel _channel =
-    MethodChannel('plugins.flutter.io/url_launcher_windows');
+import 'src/messages.g.dart';
 
 /// An implementation of [UrlLauncherPlatform] for Windows.
 class UrlLauncherWindows extends UrlLauncherPlatform {
+  /// Creates a new plugin implementation instance.
+  UrlLauncherWindows({
+    @visibleForTesting UrlLauncherApi? api,
+  }) : _hostApi = api ?? UrlLauncherApi();
+
+  final UrlLauncherApi _hostApi;
+
   /// Registers this class as the default instance of [UrlLauncherPlatform].
   static void registerWith() {
     UrlLauncherPlatform.instance = UrlLauncherWindows();
@@ -23,10 +27,7 @@ class UrlLauncherWindows extends UrlLauncherPlatform {
 
   @override
   Future<bool> canLaunch(String url) {
-    return _channel.invokeMethod<bool>(
-      'canLaunch',
-      <String, Object>{'url': url},
-    ).then((bool? value) => value ?? false);
+    return _hostApi.canLaunchUrl(url);
   }
 
   @override
@@ -39,16 +40,9 @@ class UrlLauncherWindows extends UrlLauncherPlatform {
     required bool universalLinksOnly,
     required Map<String, String> headers,
     String? webOnlyWindowName,
-  }) {
-    return _channel.invokeMethod<bool>(
-      'launch',
-      <String, Object>{
-        'url': url,
-        'enableJavaScript': enableJavaScript,
-        'enableDomStorage': enableDomStorage,
-        'universalLinksOnly': universalLinksOnly,
-        'headers': headers,
-      },
-    ).then((bool? value) => value ?? false);
+  }) async {
+    await _hostApi.launchUrl(url);
+    // Failure is handled via a PlatformException from `launchUrl`.
+    return true;
   }
 }

packages/url_launcher/url_launcher_windows/pigeons/copyright.txt

@@ -0,0 +1,3 @@
+Copyright 2013 The Flutter Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.

packages/url_launcher/url_launcher_windows/pigeons/messages.dart

@@ -0,0 +1,18 @@
+// Copyright 2013 The Flutter 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 'package:pigeon/pigeon.dart';
+
+@ConfigurePigeon(PigeonOptions(
+  dartOut: 'lib/src/messages.g.dart',
+  cppOptions: CppOptions(namespace: 'url_launcher_windows'),
+  cppHeaderOut: 'windows/messages.g.h',
+  cppSourceOut: 'windows/messages.g.cpp',
+  copyrightHeader: 'pigeons/copyright.txt',
+))
+@HostApi(dartHostTestHandler: 'TestUrlLauncherApi')
+abstract class UrlLauncherApi {
+  bool canLaunchUrl(String url);
+  void launchUrl(String url);
+}

packages/url_launcher/url_launcher_windows/pubspec.yaml

@@ -2,7 +2,7 @@ name: url_launcher_windows
 description: Windows implementation of the url_launcher plugin.
 repository: https://github.com/flutter/plugins/tree/main/packages/url_launcher/url_launcher_windows
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+url_launcher%22
-version: 3.0.2
+version: 3.0.3
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
@@ -24,4 +24,5 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  pigeon: ^5.0.1
   test: ^1.16.3

packages/url_launcher/url_launcher_windows/test/url_launcher_windows_test.dart

@@ -5,140 +5,101 @@
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:url_launcher_platform_interface/url_launcher_platform_interface.dart';
+import 'package:url_launcher_windows/src/messages.g.dart';
 import 'package:url_launcher_windows/url_launcher_windows.dart';
 
 void main() {
-  TestWidgetsFlutterBinding.ensureInitialized();
-
-  group('$UrlLauncherWindows', () {
-    const MethodChannel channel =
-        MethodChannel('plugins.flutter.io/url_launcher_windows');
-    final List<MethodCall> log = <MethodCall>[];
-    channel.setMockMethodCallHandler((MethodCall methodCall) async {
-      log.add(methodCall);
-
-      // Return null explicitly instead of relying on the implicit null
-      // returned by the method channel if no return statement is specified.
-      return null;
-    });
+  late _FakeUrlLauncherApi api;
+  late UrlLauncherWindows plugin;
 
-    test('registers instance', () {
-      UrlLauncherWindows.registerWith();
-      expect(UrlLauncherPlatform.instance, isA<UrlLauncherWindows>());
-    });
+  setUp(() {
+    api = _FakeUrlLauncherApi();
+    plugin = UrlLauncherWindows(api: api);
+  });
 
-    tearDown(() {
-      log.clear();
-    });
+  test('registers instance', () {
+    UrlLauncherWindows.registerWith();
+    expect(UrlLauncherPlatform.instance, isA<UrlLauncherWindows>());
+  });
 
-    test('canLaunch', () async {
-      final UrlLauncherWindows launcher = UrlLauncherWindows();
-      await launcher.canLaunch('http://example.com/');
-      expect(
-        log,
-        <Matcher>[
-          isMethodCall('canLaunch', arguments: <String, Object>{
-            'url': 'http://example.com/',
-          })
-        ],
-      );
-    });
+  group('canLaunch', () {
+    test('handles true', () async {
+      api.canLaunch = true;
 
-    test('canLaunch should return false if platform returns null', () async {
-      final UrlLauncherWindows launcher = UrlLauncherWindows();
-      final bool canLaunch = await launcher.canLaunch('http://example.com/');
+      final bool result = await plugin.canLaunch('http://example.com/');
 
-      expect(canLaunch, false);
+      expect(result, isTrue);
+      expect(api.argument, 'http://example.com/');
     });
 
-    test('launch', () async {
-      final UrlLauncherWindows launcher = UrlLauncherWindows();
-      await launcher.launch(
-        'http://example.com/',
-        useSafariVC: true,
-        useWebView: false,
-        enableJavaScript: false,
-        enableDomStorage: false,
-        universalLinksOnly: false,
-        headers: const <String, String>{},
-      );
-      expect(
-        log,
-        <Matcher>[
-          isMethodCall('launch', arguments: <String, Object>{
-            'url': 'http://example.com/',
-            'enableJavaScript': false,
-            'enableDomStorage': false,
-            'universalLinksOnly': false,
-            'headers': <String, String>{},
-          })
-        ],
-      );
-    });
+    test('handles false', () async {
+      api.canLaunch = false;
 
-    test('launch with headers', () async {
-      final UrlLauncherWindows launcher = UrlLauncherWindows();
-      await launcher.launch(
-        'http://example.com/',
-        useSafariVC: true,
-        useWebView: false,
-        enableJavaScript: false,
-        enableDomStorage: false,
-        universalLinksOnly: false,
-        headers: const <String, String>{'key': 'value'},
-      );
-      expect(
-        log,
-        <Matcher>[
-          isMethodCall('launch', arguments: <String, Object>{
-            'url': 'http://example.com/',
-            'enableJavaScript': false,
-            'enableDomStorage': false,
-            'universalLinksOnly': false,
-            'headers': <String, String>{'key': 'value'},
-          })
-        ],
-      );
+      final bool result = await plugin.canLaunch('http://example.com/');
+
+      expect(result, isFalse);
+      expect(api.argument, 'http://example.com/');
     });
+  });
+
+  group('launch', () {
+    test('handles success', () async {
+      api.canLaunch = true;
 
-    test('launch universal links only', () async {
-      final UrlLauncherWindows launcher = UrlLauncherWindows();
-      await launcher.launch(
-        'http://example.com/',
-        useSafariVC: false,
-        useWebView: false,
-        enableJavaScript: false,
-        enableDomStorage: false,
-        universalLinksOnly: true,
-        headers: const <String, String>{},
-      );
       expect(
-        log,
-        <Matcher>[
-          isMethodCall('launch', arguments: <String, Object>{
-            'url': 'http://example.com/',
-            'enableJavaScript': false,
-            'enableDomStorage': false,
-            'universalLinksOnly': true,
-            'headers': <String, String>{},
-          })
-        ],
-      );
+          plugin.launch(
+            'http://example.com/',
+            useSafariVC: true,
+            useWebView: false,
+            enableJavaScript: false,
+            enableDomStorage: false,
+            universalLinksOnly: false,
+            headers: const <String, String>{},
+          ),
+          completes);
+      expect(api.argument, 'http://example.com/');
     });
 
-    test('launch should return false if platform returns null', () async {
-      final UrlLauncherWindows launcher = UrlLauncherWindows();
-      final bool launched = await launcher.launch(
-        'http://example.com/',
-        useSafariVC: true,
-        useWebView: false,
-        enableJavaScript: false,
-        enableDomStorage: false,
-        universalLinksOnly: false,
-        headers: const <String, String>{},
-      );
-
-      expect(launched, false);
+    test('handles failure', () async {
+      api.canLaunch = false;
+
+      await expectLater(
+          plugin.launch(
+            'http://example.com/',
+            useSafariVC: true,
+            useWebView: false,
+            enableJavaScript: false,
+            enableDomStorage: false,
+            universalLinksOnly: false,
+            headers: const <String, String>{},
+          ),
+          throwsA(isA<PlatformException>()));
+      expect(api.argument, 'http://example.com/');
     });
   });
 }
+
+class _FakeUrlLauncherApi implements UrlLauncherApi {
+  /// The argument that was passed to an API call.
+  String? argument;
+
+  /// Controls the behavior of the fake implementations.
+  ///
+  /// - [canLaunchUrl] returns this value.
+  /// - [launchUrl] throws if this is false.
+  bool canLaunch = false;
+
+  @override
+  Future<bool> canLaunchUrl(String url) async {
+    argument = url;
+    return canLaunch;
+  }
+
+  @override
+  Future<void> launchUrl(String url) async {
+    argument = url;
+    if (!canLaunch) {
+      throw PlatformException(code: 'Failed');
+    }
+  }
+}