[flutter_tools] toolexit when using plugins with preview device (#136936)

Part of https://github.com/flutter/flutter/issues/130277

Without this, if a user runs an app that has plugins that call method channels with the `preview` device, the app will build successfully, however, they will get a runtime error when their dart code tries to call the method channel that does not exist in the native build (which was pre-built and thus does not include the plugin code).

This change adds a validation when injecting plugins that will tool exit if the device-id is `preview` and their project contains plugins with method channels.

packages/flutter_tools/lib/src/commands/run.dart

@@ -2,8 +2,6 @@
 // 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:meta/meta.dart';

packages/flutter_tools/lib/src/dart/pub.dart

@@ -150,7 +150,7 @@ abstract class Pub {
     String? flutterRootOverride,
     bool checkUpToDate = false,
     bool shouldSkipThirdPartyGenerator = true,
-    PubOutputMode outputMode = PubOutputMode.all
+    PubOutputMode outputMode = PubOutputMode.all,
   });
 
   /// Runs pub in 'batch' mode.
@@ -255,7 +255,7 @@ class _DefaultPub implements Pub {
     String? flutterRootOverride,
     bool checkUpToDate = false,
     bool shouldSkipThirdPartyGenerator = true,
-    PubOutputMode outputMode = PubOutputMode.all
+    PubOutputMode outputMode = PubOutputMode.all,
   }) async {
     final String directory = project.directory.path;
     final File packageConfigFile = project.packageConfigFile;

packages/flutter_tools/lib/src/flutter_plugins.dart

@@ -920,8 +920,29 @@ List<Plugin> _filterPluginsByVariant(List<Plugin> plugins, String platformKey, P
 }
 
 @visibleForTesting
-Future<void> writeWindowsPluginFiles(FlutterProject project, List<Plugin> plugins, TemplateRenderer templateRenderer) async {
+Future<void> writeWindowsPluginFiles(
+  FlutterProject project,
+  List<Plugin> plugins,
+  TemplateRenderer templateRenderer, {
+  Iterable<String>? allowedPlugins,
+}) async {
   final List<Plugin> methodChannelPlugins = _filterMethodChannelPlugins(plugins, WindowsPlugin.kConfigKey);
+  if (allowedPlugins != null) {
+    final List<Plugin> disallowedPlugins = methodChannelPlugins
+        .toList()
+        ..removeWhere((Plugin plugin) => allowedPlugins.contains(plugin.name));
+    if (disallowedPlugins.isNotEmpty) {
+      final StringBuffer buffer = StringBuffer();
+      buffer.writeln('The Flutter Preview device does not support the following plugins from your pubspec.yaml:');
+      buffer.writeln();
+      buffer.writeln(disallowedPlugins.map((Plugin p) => p.name).toList().toString());
+      buffer.writeln();
+      buffer.writeln('In order to build a Flutter app with plugins, you must use another target platform,');
+      buffer.writeln('such as Windows. Type `flutter doctor` into your terminal to see which target platforms');
+      buffer.writeln('are ready to be used, and how to get required dependencies for other platforms.');
+      throwToolExit(buffer.toString());
+    }
+  }
   final List<Plugin> win32Plugins = _filterPluginsByVariant(methodChannelPlugins, WindowsPlugin.kConfigKey, PluginPlatformVariant.win32);
   final List<Map<String, Object?>> windowsMethodChannelPlugins = _extractPlatformMaps(win32Plugins, WindowsPlugin.kConfigKey);
   final List<Plugin> ffiPlugins = _filterFfiPlugins(plugins, WindowsPlugin.kConfigKey)..removeWhere(methodChannelPlugins.contains);
@@ -1156,6 +1177,7 @@ Future<void> injectPlugins(
   bool linuxPlatform = false,
   bool macOSPlatform = false,
   bool windowsPlatform = false,
+  Iterable<String>? allowedPlugins,
 }) async {
   final List<Plugin> plugins = await findPlugins(project);
   // Sort the plugins by name to keep ordering stable in generated files.
@@ -1173,7 +1195,7 @@ Future<void> injectPlugins(
     await _writeMacOSPluginRegistrant(project, plugins);
   }
   if (windowsPlatform) {
-    await writeWindowsPluginFiles(project, plugins, globals.templateRenderer);
+    await writeWindowsPluginFiles(project, plugins, globals.templateRenderer, allowedPlugins: allowedPlugins);
   }
   if (!project.isModule) {
     final List<XcodeBasedProject> darwinProjects = <XcodeBasedProject>[

packages/flutter_tools/lib/src/preview_device.dart

@@ -123,6 +123,11 @@ class PreviewDevice extends Device {
   final Artifacts _artifacts;
   final File _previewBinary;
 
+  /// The set of plugins that are allowed to be used by Preview users.
+  ///
+  /// Currently no plugins are supported.
+  static const List<String> supportedPubPlugins = <String>[];
+
   @override
   void clearLogs() { }
 

packages/flutter_tools/lib/src/project.dart

@@ -329,7 +329,14 @@ class FlutterProject {
   /// registrants for app and module projects only.
   ///
   /// Will not create project platform directories if they do not already exist.
-  Future<void> regeneratePlatformSpecificTooling({DeprecationBehavior deprecationBehavior = DeprecationBehavior.none}) async {
+  ///
+  /// If [allowedPlugins] is non-null, all plugins with method channels in the
+  /// project's pubspec.yaml will be validated to be in that set, or else a
+  /// [ToolExit] will be thrown.
+  Future<void> regeneratePlatformSpecificTooling({
+    DeprecationBehavior deprecationBehavior = DeprecationBehavior.none,
+    Iterable<String>? allowedPlugins,
+  }) async {
     return ensureReadyForPlatformSpecificTooling(
       androidPlatform: android.existsSync(),
       iosPlatform: ios.existsSync(),
@@ -340,6 +347,7 @@ class FlutterProject {
       windowsPlatform: featureFlags.isWindowsEnabled && windows.existsSync(),
       webPlatform: featureFlags.isWebEnabled && web.existsSync(),
       deprecationBehavior: deprecationBehavior,
+      allowedPlugins: allowedPlugins,
     );
   }
 
@@ -353,6 +361,7 @@ class FlutterProject {
     bool windowsPlatform = false,
     bool webPlatform = false,
     DeprecationBehavior deprecationBehavior = DeprecationBehavior.none,
+    Iterable<String>? allowedPlugins,
   }) async {
     if (!directory.existsSync() || isPlugin) {
       return;
@@ -383,6 +392,7 @@ class FlutterProject {
       linuxPlatform: linuxPlatform,
       macOSPlatform: macOSPlatform,
       windowsPlatform: windowsPlatform,
+      allowedPlugins: allowedPlugins,
     );
   }
 

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -27,6 +27,7 @@ import '../dart/pub.dart';
 import '../device.dart';
 import '../features.dart';
 import '../globals.dart' as globals;
+import '../preview_device.dart';
 import '../project.dart';
 import '../reporting/reporting.dart';
 import '../web/compile.dart';
@@ -1694,7 +1695,14 @@ Run 'flutter -h' (or 'flutter <command> -h') for available flutter commands and
         project: project,
         checkUpToDate: cachePubGet,
       );
-      await project.regeneratePlatformSpecificTooling();
+
+      // null implicitly means all plugins are allowed
+      List<String>? allowedPlugins;
+      if (stringArg(FlutterGlobalOptions.kDeviceIdOption, global: true) == 'preview') {
+        // The preview device does not currently support any plugins.
+        allowedPlugins = PreviewDevice.supportedPubPlugins;
+      }
+      await project.regeneratePlatformSpecificTooling(allowedPlugins: allowedPlugins);
       if (reportNullSafety) {
         await _sendNullSafetyAnalyticsEvents(project);
       }

packages/flutter_tools/test/general.shard/plugins_test.dart

@@ -17,6 +17,7 @@ import 'package:flutter_tools/src/flutter_plugins.dart';
 import 'package:flutter_tools/src/globals.dart' as globals;
 import 'package:flutter_tools/src/ios/xcodeproj.dart';
 import 'package:flutter_tools/src/plugins.dart';
+import 'package:flutter_tools/src/preview_device.dart';
 import 'package:flutter_tools/src/project.dart';
 import 'package:flutter_tools/src/version.dart';
 import 'package:test/fake.dart';
@@ -210,7 +211,7 @@ void main() {
             ? fakePubCache.childDirectory(name)
             : fileSystem.directory(nameOrPath);
         packagesFile.writeAsStringSync(
-            '$name:file://${pluginDirectory.childFile('lib').uri}\n',
+            '$name:${pluginDirectory.childFile('lib').uri}\n',
             mode: FileMode.writeOnlyAppend);
         pluginDirectory.childFile('pubspec.yaml')
             ..createSync(recursive: true)
@@ -1438,6 +1439,29 @@ flutter:
         FileSystem: () => fsWindows,
         ProcessManager: () => FakeProcessManager.any(),
       });
+
+      testUsingContext('injectPlugins will validate if all plugins in the project are part of the passed allowedPlugins', () async {
+        // Re-run the setup using the Windows filesystem.
+        setUpProject(fsWindows);
+        createFakePlugins(fsWindows, const <String>['plugin_one', 'plugin_two']);
+
+        expect(
+          () => injectPlugins(
+            flutterProject,
+            linuxPlatform: true,
+            windowsPlatform: true,
+            allowedPlugins: PreviewDevice.supportedPubPlugins,
+          ),
+          throwsToolExit(message: '''
+The Flutter Preview device does not support the following plugins from your pubspec.yaml:
+
+[plugin_one, plugin_two]
+'''),
+        );
+      }, overrides: <Type, Generator>{
+        FileSystem: () => fsWindows,
+        ProcessManager: () => FakeProcessManager.empty(),
+      });
     });
 
     group('createPluginSymlinks', () {