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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PDF_POST_MESSAGE_RECEIVER_H_
#define PDF_POST_MESSAGE_RECEIVER_H_
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
#include "gin/interceptor.h"
#include "gin/public/wrapper_info.h"
#include "gin/wrappable.h"
#include "v8/include/v8.h"
namespace base {
class SequencedTaskRunner;
} // namespace base
namespace gin {
class ObjectTemplateBuilder;
} // namespace gin
namespace chrome_pdf {
class V8ValueConverter;
// Implements the `postMessage()` API exposed to the plugin embedder. The
// received messages are converted and forwarded to the `Client`.
// `PostMessageReceiver`'s lifetime is managed by the V8 garbage collector,
// meaning it can outlive the `Client`. Messages are dropped if the `Client` is
// destroyed.
class PostMessageReceiver final : public gin::Wrappable<PostMessageReceiver>,
public gin::NamedPropertyInterceptor {
public:
// The interface for a plugin client that handles messages from its embedder.
class Client {
public:
// Handles converted messages from the embedder.
virtual void OnMessage(const base::Value::Dict& message) = 0;
protected:
Client() = default;
~Client() = default;
};
static gin::WrapperInfo kWrapperInfo;
// Creates a scriptable object with an implemented `postMessage()` method.
// Messages are posted asynchronously to `client` using `client_task_runner`.
static v8::Local<v8::Object> Create(
v8::Isolate* isolate,
base::WeakPtr<V8ValueConverter> v8_value_converter,
base::WeakPtr<Client> client,
scoped_refptr<base::SequencedTaskRunner> client_task_runner);
PostMessageReceiver(const PostMessageReceiver&) = delete;
PostMessageReceiver& operator=(const PostMessageReceiver&) = delete;
protected:
~PostMessageReceiver() override;
private:
PostMessageReceiver(
v8::Isolate* isolate,
base::WeakPtr<V8ValueConverter> v8_value_converter,
base::WeakPtr<Client> client,
scoped_refptr<base::SequencedTaskRunner> client_task_runner);
// gin::Wrappable:
gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
v8::Isolate* isolate) override;
const char* GetTypeName() override;
// gin::NamedPropertyInterceptor:
v8::Local<v8::Value> GetNamedProperty(v8::Isolate* isolate,
const std::string& property) override;
std::vector<std::string> EnumerateNamedProperties(
v8::Isolate* isolate) override;
// Lazily creates and retrieves `function_template_`.
v8::Local<v8::FunctionTemplate> GetFunctionTemplate();
// Implements the `postMessage()` method called by the embedder.
void PostMessage(v8::Local<v8::Value> message);
base::WeakPtr<V8ValueConverter> v8_value_converter_;
v8::Persistent<v8::FunctionTemplate> function_template_;
raw_ptr<v8::Isolate> isolate_;
base::WeakPtr<Client> client_;
scoped_refptr<base::SequencedTaskRunner> client_task_runner_;
base::WeakPtrFactory<PostMessageReceiver> weak_factory_{this};
};
} // namespace chrome_pdf
#endif // PDF_POST_MESSAGE_RECEIVER_H_
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