feat: service worker preload scripts for improved extensions support (#44411)

* feat: preload scripts for service workers

* feat: service worker IPC

* test: service worker preload scripts and ipc

shell/common/gin_helper/callback.cc

@@ -33,7 +33,10 @@ struct TranslatorHolder {
 };
 
 // Cached JavaScript version of |CallTranslator|.
-v8::Persistent<v8::FunctionTemplate> g_call_translator;
+// v8::Persistent handles are bound to a specific v8::Isolate. Require
+// initializing per-thread to avoid using the wrong isolate from service
+// worker preload scripts.
+thread_local v8::Persistent<v8::FunctionTemplate> g_call_translator;
 
 void CallTranslator(v8::Local<v8::External> external,
                     v8::Local<v8::Object> state,

shell/common/gin_helper/reply_channel.cc

@@ -0,0 +1,66 @@
+// Copyright (c) 2023 Salesforce, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "shell/common/gin_helper/reply_channel.h"
+
+#include "base/debug/stack_trace.h"
+#include "gin/data_object_builder.h"
+#include "gin/handle.h"
+#include "gin/object_template_builder.h"
+#include "shell/browser/javascript_environment.h"
+#include "shell/common/gin_converters/blink_converter.h"
+
+namespace gin_helper::internal {
+
+// static
+using InvokeCallback = electron::mojom::ElectronApiIPC::InvokeCallback;
+gin::Handle<ReplyChannel> ReplyChannel::Create(v8::Isolate* isolate,
+                                               InvokeCallback callback) {
+  return gin::CreateHandle(isolate, new ReplyChannel(std::move(callback)));
+}
+
+gin::ObjectTemplateBuilder ReplyChannel::GetObjectTemplateBuilder(
+    v8::Isolate* isolate) {
+  return gin::Wrappable<ReplyChannel>::GetObjectTemplateBuilder(isolate)
+      .SetMethod("sendReply", &ReplyChannel::SendReply);
+}
+
+const char* ReplyChannel::GetTypeName() {
+  return "ReplyChannel";
+}
+
+ReplyChannel::ReplyChannel(InvokeCallback callback)
+    : callback_(std::move(callback)) {}
+
+ReplyChannel::~ReplyChannel() {
+  if (callback_)
+    SendError("reply was never sent");
+}
+
+void ReplyChannel::SendError(const std::string& msg) {
+  v8::Isolate* isolate = electron::JavascriptEnvironment::GetIsolate();
+  // If there's no current context, it means we're shutting down, so we
+  // don't need to send an event.
+  if (!isolate->GetCurrentContext().IsEmpty()) {
+    v8::HandleScope scope(isolate);
+    auto message = gin::DataObjectBuilder(isolate).Set("error", msg).Build();
+    SendReply(isolate, message);
+  }
+}
+
+bool ReplyChannel::SendReply(v8::Isolate* isolate, v8::Local<v8::Value> arg) {
+  if (!callback_)
+    return false;
+  blink::CloneableMessage message;
+  if (!gin::ConvertFromV8(isolate, arg, &message)) {
+    return false;
+  }
+
+  std::move(callback_).Run(std::move(message));
+  return true;
+}
+
+gin::WrapperInfo ReplyChannel::kWrapperInfo = {gin::kEmbedderNativeGin};
+
+}  // namespace gin_helper::internal

shell/common/gin_helper/reply_channel.h

@@ -0,0 +1,54 @@
+// Copyright (c) 2023 Salesforce, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ELECTRON_SHELL_COMMON_GIN_HELPER_REPLY_CHANNEL_H_
+#define ELECTRON_SHELL_COMMON_GIN_HELPER_REPLY_CHANNEL_H_
+
+#include "gin/wrappable.h"
+#include "shell/common/api/api.mojom.h"
+
+namespace gin {
+template <typename T>
+class Handle;
+}  // namespace gin
+
+namespace v8 {
+class Isolate;
+template <typename T>
+class Local;
+class Object;
+class ObjectTemplate;
+}  // namespace v8
+
+namespace gin_helper::internal {
+
+// This object wraps the InvokeCallback so that if it gets GC'd by V8, we can
+// still call the callback and send an error. Not doing so causes a Mojo DCHECK,
+// since Mojo requires callbacks to be called before they are destroyed.
+class ReplyChannel : public gin::Wrappable<ReplyChannel> {
+ public:
+  using InvokeCallback = electron::mojom::ElectronApiIPC::InvokeCallback;
+  static gin::Handle<ReplyChannel> Create(v8::Isolate* isolate,
+                                          InvokeCallback callback);
+
+  // gin::Wrappable
+  static gin::WrapperInfo kWrapperInfo;
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) override;
+  const char* GetTypeName() override;
+
+  void SendError(const std::string& msg);
+
+ private:
+  explicit ReplyChannel(InvokeCallback callback);
+  ~ReplyChannel() override;
+
+  bool SendReply(v8::Isolate* isolate, v8::Local<v8::Value> arg);
+
+  InvokeCallback callback_;
+};
+
+}  // namespace gin_helper::internal
+
+#endif  // ELECTRON_SHELL_COMMON_GIN_HELPER_REPLY_CHANNEL_H_