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_SESSION_MANAGER_H_
6#define REMOTING_HOST_HOST_EXTENSION_SESSION_MANAGER_H_
7
8#include <string>
9#include <vector>
10
11#include "base/memory/scoped_ptr.h"
12#include "base/memory/scoped_vector.h"
13
14namespace webrtc {
15class DesktopCapturer;
16}
17
18namespace remoting {
19
20class ClientSessionControl;
21class HostExtension;
22class HostExtensionSession;
23class VideoEncoder;
24
25namespace protocol {
26class ClientStub;
27class ExtensionMessage;
28}
29
30// Helper class used to create and manage a set of HostExtensionSession
31// instances depending upon the set of registered HostExtensions, and the
32// set of capabilities negotiated between client and host.
33class HostExtensionSessionManager {
34 public:
35  typedef std::vector<HostExtension*> HostExtensions;
36
37  // Creates an extension manager for the specified |extensions|.
38  HostExtensionSessionManager(const HostExtensions& extensions,
39                              ClientSessionControl* client_session_control);
40  virtual ~HostExtensionSessionManager();
41
42  // Returns the union of all capabilities supported by registered extensions.
43  std::string GetCapabilities() const;
44
45  // Calls the corresponding hook functions for each extension, to allow them
46  // to wrap or replace video pipeline components. Only extensions which return
47  // true from ModifiesVideoPipeline() will be called.
48  // The order in which extensions are called is undefined.
49  void OnCreateVideoCapturer(scoped_ptr<webrtc::DesktopCapturer>* capturer);
50  void OnCreateVideoEncoder(scoped_ptr<VideoEncoder>* encoder);
51
52  // Handles completion of authentication and capabilities negotiation, creating
53  // the set of HostExtensionSessions to match the client's capabilities.
54  void OnNegotiatedCapabilities(protocol::ClientStub* client_stub,
55                                const std::string& capabilities);
56
57  // Passes |message| to each HostExtensionSession in turn until the message
58  // is handled, or none remain. Returns true if the message was handled.
59  // It is not valid for more than one extension to handle the same message.
60  bool OnExtensionMessage(const protocol::ExtensionMessage& message);
61
62 private:
63  typedef ScopedVector<HostExtensionSession> HostExtensionSessions;
64
65  // Passed to HostExtensionSessions to allow them to send messages,
66  // disconnect the session, etc.
67  ClientSessionControl* client_session_control_;
68  protocol::ClientStub* client_stub_;
69
70  // The HostExtensions to instantiate for the session, if it reaches the
71  // authenticated state.
72  HostExtensions extensions_;
73
74  // The instantiated HostExtensionSessions, used to handle extension messages.
75  HostExtensionSessions extension_sessions_;
76
77  DISALLOW_COPY_AND_ASSIGN(HostExtensionSessionManager);
78};
79
80}  // namespace remoting
81
82#endif  // REMOTING_HOST_HOST_EXTENSION_SESSION_MANAGER_H_
83