1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef REMOTING_HOST_HOST_EXTENSION_H_ 6 #define REMOTING_HOST_HOST_EXTENSION_H_ 7 8 #include <string> 9 10 #include "base/memory/scoped_ptr.h" 11 12 namespace remoting { 13 14 class ClientSession; 15 class HostExtensionSession; 16 17 // Extends |ChromotingHost| with new functionality, and can use extension 18 // messages to communicate with the client. 19 class HostExtension { 20 public: ~HostExtension()21 virtual ~HostExtension() {} 22 23 // Returns a space-separated list of capabilities provided by this extension. 24 // Capabilities may be used to inform the client of the availability of an 25 // extension. They are merged into the capabilities the host reports to the 26 // client. 27 virtual std::string GetCapabilities() = 0; 28 29 // Creates an extension session, which can handle extension messages for a 30 // client session. 31 // NULL may be returned if |client_session| cannot support this 32 // extension. 33 // |client_session| must outlive the resulting |HostExtensionSession|. 34 virtual scoped_ptr<HostExtensionSession> CreateExtensionSession( 35 ClientSession* client_session) = 0; 36 }; 37 38 } // namespace remoting 39 40 #endif // REMOTING_HOST_HOST_EXTENSION_H_ 41