-
-
Notifications
You must be signed in to change notification settings - Fork 15.8k
/
WebSocketServerHandshaker08.java
184 lines (168 loc) · 7.17 KB
/
WebSocketServerHandshaker08.java
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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*
* Copyright 2019 The Netty Project
*
* The Netty Project licenses this file to you 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.
*/
package io.netty.handler.codec.http.websocketx;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.util.CharsetUtil;
import static io.netty.handler.codec.http.HttpVersion.*;
/**
* <p>
* Performs server side opening and closing handshakes for web socket specification version <a
* href="http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10" >draft-ietf-hybi-thewebsocketprotocol-
* 10</a>
* </p>
*/
public class WebSocketServerHandshaker08 extends WebSocketServerHandshaker {
public static final String WEBSOCKET_08_ACCEPT_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
/**
* Constructor specifying the destination web socket location
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath".
* Subsequent web socket frames will be sent to this URL.
* @param subprotocols
* CSV of supported protocols
* @param allowExtensions
* Allow extensions to be used in the reserved bits of the web socket frame
* @param maxFramePayloadLength
* Maximum allowable frame payload length. Setting this value to your application's
* requirement may reduce denial of service attacks using long data frames.
*/
public WebSocketServerHandshaker08(
String webSocketURL, String subprotocols, boolean allowExtensions, int maxFramePayloadLength) {
this(webSocketURL, subprotocols, allowExtensions, maxFramePayloadLength, false);
}
/**
* Constructor specifying the destination web socket location
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath".
* Subsequent web socket frames will be sent to this URL.
* @param subprotocols
* CSV of supported protocols
* @param allowExtensions
* Allow extensions to be used in the reserved bits of the web socket frame
* @param maxFramePayloadLength
* Maximum allowable frame payload length. Setting this value to your application's
* requirement may reduce denial of service attacks using long data frames.
* @param allowMaskMismatch
* When set to true, frames which are not masked properly according to the standard will still be
* accepted.
*/
public WebSocketServerHandshaker08(
String webSocketURL, String subprotocols, boolean allowExtensions, int maxFramePayloadLength,
boolean allowMaskMismatch) {
this(webSocketURL, subprotocols, WebSocketDecoderConfig.newBuilder()
.allowExtensions(allowExtensions)
.maxFramePayloadLength(maxFramePayloadLength)
.allowMaskMismatch(allowMaskMismatch)
.build());
}
/**
* Constructor specifying the destination web socket location
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath".
* Subsequent web socket frames will be sent to this URL.
* @param subprotocols
* CSV of supported protocols
* @param decoderConfig
* Frames decoder configuration.
*/
public WebSocketServerHandshaker08(
String webSocketURL, String subprotocols, WebSocketDecoderConfig decoderConfig) {
super(WebSocketVersion.V08, webSocketURL, subprotocols, decoderConfig);
}
/**
* <p>
* Handle the web socket handshake for the web socket specification <a href=
* "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-08">HyBi version 8 to 10</a>. Version 8, 9 and
* 10 share the same wire protocol.
* </p>
*
* <p>
* Browser request to the server:
* </p>
*
* <pre>
* GET /chat HTTP/1.1
* Host: server.example.com
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
* Sec-WebSocket-Protocol: chat, superchat
* Sec-WebSocket-Version: 8
* </pre>
*
* <p>
* Server response:
* </p>
*
* <pre>
* HTTP/1.1 101 Switching Protocols
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
* Sec-WebSocket-Protocol: chat
* </pre>
*/
@Override
protected FullHttpResponse newHandshakeResponse(FullHttpRequest req, HttpHeaders headers) {
CharSequence key = req.headers().get(HttpHeaderNames.SEC_WEBSOCKET_KEY);
if (key == null) {
throw new WebSocketHandshakeException("not a WebSocket request: missing key");
}
FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, HttpResponseStatus.SWITCHING_PROTOCOLS,
req.content().alloc().buffer(0));
if (headers != null) {
res.headers().add(headers);
}
String acceptSeed = key + WEBSOCKET_08_ACCEPT_GUID;
byte[] sha1 = WebSocketUtil.sha1(acceptSeed.getBytes(CharsetUtil.US_ASCII));
String accept = WebSocketUtil.base64(sha1);
if (logger.isDebugEnabled()) {
logger.debug("WebSocket version 08 server handshake key: {}, response: {}", key, accept);
}
res.headers().add(HttpHeaderNames.UPGRADE, HttpHeaderValues.WEBSOCKET);
res.headers().add(HttpHeaderNames.CONNECTION, HttpHeaderValues.UPGRADE);
res.headers().add(HttpHeaderNames.SEC_WEBSOCKET_ACCEPT, accept);
String subprotocols = req.headers().get(HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL);
if (subprotocols != null) {
String selectedSubprotocol = selectSubprotocol(subprotocols);
if (selectedSubprotocol == null) {
if (logger.isDebugEnabled()) {
logger.debug("Requested subprotocol(s) not supported: {}", subprotocols);
}
} else {
res.headers().add(HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL, selectedSubprotocol);
}
}
return res;
}
@Override
protected WebSocketFrameDecoder newWebsocketDecoder() {
return new WebSocket08FrameDecoder(decoderConfig());
}
@Override
protected WebSocketFrameEncoder newWebSocketEncoder() {
return new WebSocket08FrameEncoder(false);
}
}