1 // Copyright 2019 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 CAST_SENDER_PUBLIC_SENDER_SOCKET_FACTORY_H_
6 #define CAST_SENDER_PUBLIC_SENDER_SOCKET_FACTORY_H_
7 
8 #include <openssl/x509.h>
9 
10 #include <set>
11 #include <utility>
12 #include <vector>
13 
14 #include "cast/common/public/cast_socket.h"
15 #include "platform/api/serial_delete_ptr.h"
16 #include "platform/api/task_runner.h"
17 #include "platform/api/tls_connection_factory.h"
18 #include "platform/base/ip_address.h"
19 
20 namespace openscreen {
21 namespace cast {
22 
23 class AuthContext;
24 
25 class SenderSocketFactory final : public TlsConnectionFactory::Client,
26                                   public CastSocket::Client {
27  public:
28   class Client {
29    public:
30     virtual void OnConnected(SenderSocketFactory* factory,
31                              const IPEndpoint& endpoint,
32                              std::unique_ptr<CastSocket> socket) = 0;
33     virtual void OnError(SenderSocketFactory* factory,
34                          const IPEndpoint& endpoint,
35                          Error error) = 0;
36   };
37 
38   enum class DeviceMediaPolicy {
39     kNone = 0,
40     kAudioOnly,
41     kIncludesVideo,
42   };
43 
44   // |client| and |task_runner| must outlive |this|.
45   SenderSocketFactory(Client* client, TaskRunner* task_runner);
46   ~SenderSocketFactory();
47 
48   // |factory| cannot be nullptr and must outlive |this|.
49   void set_factory(TlsConnectionFactory* factory);
50 
51   // Begins connecting to a Cast device at |endpoint|.  If a successful
52   // connection is made, including device authentication, the new CastSocket
53   // will be passed to |client_|'s OnConnected method.  The new CastSocket will
54   // have its client set to |client|.  If any part of the connection process
55   // fails, |client_|'s OnError method is called instead.  This includes if the
56   // device's media policy, as determined by authentication, is audio-only and
57   // |media_policy| is kIncludesVideo.
58   void Connect(const IPEndpoint& endpoint,
59                DeviceMediaPolicy media_policy,
60                CastSocket::Client* client);
61 
62   // TlsConnectionFactory::Client overrides.
63   void OnAccepted(TlsConnectionFactory* factory,
64                   std::vector<uint8_t> der_x509_peer_cert,
65                   std::unique_ptr<TlsConnection> connection) override;
66   void OnConnected(TlsConnectionFactory* factory,
67                    std::vector<uint8_t> der_x509_peer_cert,
68                    std::unique_ptr<TlsConnection> connection) override;
69   void OnConnectionFailed(TlsConnectionFactory* factory,
70                           const IPEndpoint& remote_address) override;
71   void OnError(TlsConnectionFactory* factory, Error error) override;
72 
73  private:
74   struct PendingConnection {
75     IPEndpoint endpoint;
76     DeviceMediaPolicy media_policy;
77     CastSocket::Client* client;
78   };
79 
80   struct PendingAuth {
81     IPEndpoint endpoint;
82     DeviceMediaPolicy media_policy;
83     SerialDeletePtr<CastSocket> socket;
84     CastSocket::Client* client;
85     std::unique_ptr<AuthContext> auth_context;
86     bssl::UniquePtr<X509> peer_cert;
87   };
88 
89   friend bool operator<(const std::unique_ptr<PendingAuth>& a, int b);
90   friend bool operator<(int a, const std::unique_ptr<PendingAuth>& b);
91 
92   std::vector<PendingConnection>::iterator FindPendingConnection(
93       const IPEndpoint& endpoint);
94 
95   // CastSocket::Client overrides.
96   void OnError(CastSocket* socket, Error error) override;
97   void OnMessage(CastSocket* socket,
98                  ::cast::channel::CastMessage message) override;
99 
100   Client* const client_;
101   TaskRunner* const task_runner_;
102   TlsConnectionFactory* factory_ = nullptr;
103   std::vector<PendingConnection> pending_connections_;
104   std::vector<std::unique_ptr<PendingAuth>> pending_auth_;
105 };
106 
107 }  // namespace cast
108 }  // namespace openscreen
109 
110 #endif  // CAST_SENDER_PUBLIC_SENDER_SOCKET_FACTORY_H_
111