web-stream-reference-implementation/src/h2_tls_server.h at main · bidiweb/web-stream-reference-implementation · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 * Copyright 2026 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef WISH_CPP_SRC_H2_TLS_SERVER_H_
#define WISH_CPP_SRC_H2_TLS_SERVER_H_

#include <event2/bufferevent.h>
#include <event2/event.h>
#include <event2/listener.h>
#include <nghttp2/nghttp2.h>

#include <functional>
#include <string>
#include <unordered_map>

#include "nghttp2_web_stream.h"
#include "tls_context.h"

// H2TlsServer listens for TLS-encrypted HTTP/2 connections.
// ALPN "h2" is advertised so standard HTTP/2 clients can connect.
// mTLS is enforced (client certificates are required), matching TlsServer.
class H2TlsServer {
 public:
  using StreamCallback = std::function<void(WebStream*)>;

  H2TlsServer(event_base* base,
              const std::string& ca_file,
              const std::string& cert_file,
              const std::string& key_file,
              int port);
  ~H2TlsServer();

  bool Init();
  void SetOnStream(StreamCallback cb);
  int Run();

 private:
  struct Session {
    struct Http2Stream {
      std::unordered_map<std::string, std::string> headers;
      NGHTTP2WebStream* web_stream = nullptr;
    };

    H2TlsServer* server;

    bufferevent* bev;

    nghttp2_session* h2session;

    // Tracks received headers and active web-streams per HTTP/2 stream.
    std::unordered_map<int32_t, Http2Stream> incoming_streams;
  };

  // libevent listener callbacks
  static void AcceptConnCb(evconnlistener*,
                           evutil_socket_t,
                           sockaddr*, int,
                           void*);
  static void AcceptErrorCb(evconnlistener*,
                            void*);

  // libevent bufferevent callbacks
  static void ReadCallback(bufferevent*,
                           void*);
  static void EventCallback(bufferevent*,
                            short,  // NOLINT(runtime/int)
                            void*);

  // nghttp2 session callbacks
  static nghttp2_ssize SendCallback(nghttp2_session*,
                                    const uint8_t*,
                                    size_t,
                                    int,
                                    void*);
  static int OnHeaderCallback(nghttp2_session*,
                              const nghttp2_frame*,
                              const uint8_t*,
                              size_t,
                              const uint8_t*,
                              size_t,
                              uint8_t,
                              void*);
  static int OnFrameRecvCallback(nghttp2_session*,
                                 const nghttp2_frame*,
                                 void*);
  static int OnDataChunkRecvCallback(nghttp2_session*,
                                     uint8_t,
                                     int32_t,
                                     const uint8_t*,
                                     size_t,
                                     void*);
  static int OnStreamCloseCallback(nghttp2_session*,
                                   int32_t,
                                   uint32_t,
                                   void*);

  static nghttp2_ssize DataSourceReadCallback(nghttp2_session*,
                                              int32_t,
                                              uint8_t*,
                                              size_t,
                                              uint32_t*,
                                              nghttp2_data_source*,
                                              void*);

  static nghttp2_session* CreateH2Session(Session* sess);

  event_base* base_;

  int port_;

  std::string ca_file_;
  std::string cert_file_;
  std::string key_file_;

  evconnlistener* listener_;

  TlsContext tls_ctx_;

  StreamCallback on_stream_;
};

#endif  // WISH_CPP_SRC_H2_TLS_SERVER_H_