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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_API_MESSAGING_NATIVE_MESSAGE_HOST_H_
#define EXTENSIONS_BROWSER_API_MESSAGING_NATIVE_MESSAGE_HOST_H_
#include <memory>
#include <string>
#include "base/task/single_thread_task_runner.h"
#include "ui/gfx/native_widget_types.h"
namespace content {
class BrowserContext;
} // namespace content
namespace extensions {
// An interface for receiving messages from MessageService (Chrome) using the
// Native Messaging API. A NativeMessageHost object hosts a native component,
// which can run in the browser-process or in a separate process (See
// NativeMessageProcessHost).
class NativeMessageHost {
public:
static const char kFailedToStartError[];
static const char kInvalidNameError[];
static const char kNativeHostExited[];
static const char kNotFoundError[];
static const char kForbiddenError[];
static const char kHostInputOutputError[];
// Callback interface for receiving messages from the native host.
class Client {
public:
virtual ~Client() {}
// Called on the UI thread.
virtual void PostMessageFromNativeHost(const std::string& message) = 0;
virtual void CloseChannel(const std::string& error_message) = 0;
};
// Creates the NativeMessageHost based on the `native_host_name`.
static std::unique_ptr<NativeMessageHost> Create(
content::BrowserContext* browser_context,
gfx::NativeView native_view,
const std::string& source_extension_id,
const std::string& native_host_name,
bool allow_user_level,
std::string* error);
virtual ~NativeMessageHost() {}
// Called when a message is received from MessageService (Chrome).
virtual void OnMessage(const std::string& message) = 0;
// Sets the client to start receiving messages from the native host.
virtual void Start(Client* client) = 0;
// Returns the task runner that the host runs on. The Client should only
// invoke OnMessage() on this task runner.
virtual scoped_refptr<base::SingleThreadTaskRunner> task_runner() const = 0;
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_MESSAGING_NATIVE_MESSAGE_HOST_H_
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