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1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <arpa/inet.h>
20 #include <cstdint>
21 #include <functional>
22 #include <memory>
23 #include <string>
24 #include <sys/types.h>
25 
26 struct ClientSocket;
27 
28 struct WebSocketHandler {
29     virtual ~WebSocketHandler() = default;
30 
31     // Returns number bytes processed or error.
32     ssize_t handleRequest(uint8_t *data, size_t size, bool isEOS);
33 
34     bool isConnected();
35 
36     virtual void setClientSocket(std::weak_ptr<ClientSocket> client);
37 
38     typedef std::function<void(const uint8_t *, size_t)> OutputCallback;
39     void setOutputCallback(const sockaddr_in &remoteAddr, OutputCallback fn);
40 
41     enum class SendMode {
42         text,
43         binary,
44         closeConnection,
45     };
46     int sendMessage(
47             const void *data, size_t size, SendMode mode = SendMode::text);
48 
49     std::string remoteHost() const;
50 
51 protected:
52     virtual int handleMessage(
53             uint8_t headerByte, const uint8_t *msg, size_t len) = 0;
54 
55 private:
56     std::weak_ptr<ClientSocket> mClientSocket;
57 
58     OutputCallback mOutputCallback;
59     sockaddr_in mRemoteAddr;
60 };
61