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// Copyright 2016 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.
#ifndef EXTENSIONS_RENDERER_NATIVE_EXTENSION_BINDINGS_SYSTEM_H_
#define EXTENSIONS_RENDERER_NATIVE_EXTENSION_BINDINGS_SYSTEM_H_
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "extensions/renderer/api_bindings_system.h"
#include "extensions/renderer/event_emitter.h"
#include "extensions/renderer/extension_bindings_system.h"
#include "v8/include/v8.h"
struct ExtensionHostMsg_Request_Params;
namespace extensions {
class ScriptContext;
// The implementation of the Bindings System for extensions code with native
// implementations (rather than JS hooks). Handles permission/availability
// checking and creates all bindings available for a given context. Sending the
// IPC is still abstracted out for testing purposes, but otherwise this should
// be a plug-and-play version for use in the Extensions system.
// Designed to be used in a single thread, but for all contexts on that thread.
class NativeExtensionBindingsSystem : public ExtensionBindingsSystem {
public:
using SendRequestIPCMethod =
base::Callback<void(ScriptContext*,
const ExtensionHostMsg_Request_Params&)>;
using SendEventListenerIPCMethod =
base::Callback<void(binding::EventListenersChanged,
ScriptContext*,
const std::string& event_name)>;
NativeExtensionBindingsSystem(
const SendRequestIPCMethod& send_request_ipc,
const SendEventListenerIPCMethod& send_event_listener_ipc);
~NativeExtensionBindingsSystem() override;
// ExtensionBindingsSystem:
void DidCreateScriptContext(ScriptContext* context) override;
void WillReleaseScriptContext(ScriptContext* context) override;
void UpdateBindingsForContext(ScriptContext* context) override;
void DispatchEventInContext(const std::string& event_name,
const base::ListValue* event_args,
const base::DictionaryValue* filtering_info,
ScriptContext* context) override;
void HandleResponse(int request_id,
bool success,
const base::ListValue& response,
const std::string& error) override;
RequestSender* GetRequestSender() override;
private:
// Handles sending a given |request|, forwarding it on to the send_ipc_ after
// adding additional info.
void SendRequest(std::unique_ptr<APIBinding::Request> request,
v8::Local<v8::Context> context);
// Called when listeners for a given event have changed, and forwards it along
// to |send_event_listener_ipc_|.
void OnEventListenerChanged(const std::string& event_name,
binding::EventListenersChanged change,
v8::Local<v8::Context> context);
// Getter callback for an extension API, since APIs are constructed lazily.
static void GetAPIHelper(v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info);
// Handler to send request IPCs. Abstracted out for testing purposes.
SendRequestIPCMethod send_request_ipc_;
// Handler to notify the browser of event registrations. Abstracted out for
// testing purposes.
SendEventListenerIPCMethod send_event_listener_ipc_;
// The APIBindingsSystem associated with this class.
APIBindingsSystem api_system_;
base::WeakPtrFactory<NativeExtensionBindingsSystem> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(NativeExtensionBindingsSystem);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_NATIVE_EXTENSION_BINDINGS_SYSTEM_H_
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