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// Copyright 2014 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 REMOTING_HOST_HOST_EXTENSION_H_
#define REMOTING_HOST_HOST_EXTENSION_H_
#include <string>
#include "base/memory/scoped_ptr.h"
namespace remoting {
class ClientSession;
class HostExtensionSession;
// Extends |ChromotingHost| with new functionality, and can use extension
// messages to communicate with the client.
class HostExtension {
public:
virtual ~HostExtension() {}
// Returns a space-separated list of capabilities provided by this extension.
// Capabilities may be used to inform the client of the availability of an
// extension. They are merged into the capabilities the host reports to the
// client.
virtual std::string GetCapabilities() = 0;
// Creates an extension session, which can handle extension messages for a
// client session.
// NULL may be returned if |client_session| cannot support this
// extension.
// |client_session| must outlive the resulting |HostExtensionSession|.
virtual scoped_ptr<HostExtensionSession> CreateExtensionSession(
ClientSession* client_session) = 0;
};
} // namespace remoting
#endif // REMOTING_HOST_HOST_EXTENSION_H_
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