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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | |
2 // for details. All rights reserved. Use of this source code is governed by a | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 | |
5 import 'dart:async'; | |
6 | |
7 import 'package:crypto/crypto.dart'; | |
8 | |
9 import '../copy/web_socket_impl.dart'; | |
10 import 'channel.dart'; | |
11 | |
12 /// Use [WebSocketChannel] instead. | |
13 @Deprecated("Will be removed in 3.0.0.") | |
14 abstract class CompatibleWebSocket implements Stream, StreamSink { | |
15 /// The interval for sending ping signals. | |
16 /// | |
17 /// If a ping message is not answered by a pong message from the peer, the | |
18 /// `WebSocket` is assumed disconnected and the connection is closed with a | |
19 /// [WebSocketStatus.GOING_AWAY] close code. When a ping signal is sent, the | |
20 /// pong message must be received within [pingInterval]. | |
21 /// | |
22 /// There are never two outstanding pings at any given time, and the next ping | |
23 /// timer starts when the pong is received. | |
24 /// | |
25 /// By default, the [pingInterval] is `null`, indicating that ping messages | |
26 /// are disabled. | |
27 Duration pingInterval; | |
28 | |
29 /// The [close code][] set when the WebSocket connection is closed. | |
30 /// | |
31 /// [close code]: https://tools.ietf.org/html/rfc6455#section-7.1.5 | |
32 /// | |
33 /// Before the connection has been closed, this will be `null`. | |
34 int get closeCode; | |
35 | |
36 /// The [close reason][] set when the WebSocket connection is closed. | |
37 /// | |
38 /// [close reason]: https://tools.ietf.org/html/rfc6455#section-7.1.6 | |
39 /// | |
40 /// Before the connection has been closed, this will be `null`. | |
41 String get closeReason; | |
42 | |
43 /// Signs a `Sec-WebSocket-Key` header sent by a WebSocket client as part of | |
44 /// the [initial handshake]. | |
45 /// | |
46 /// The return value should be sent back to the client in a | |
47 /// `Sec-WebSocket-Accept` header. | |
48 /// | |
49 /// [initial handshake]: https://tools.ietf.org/html/rfc6455#section-4.2.2 | |
50 static String signKey(String key) { | |
51 var hash = new SHA1(); | |
52 // We use [codeUnits] here rather than UTF-8-decoding the string because | |
53 // [key] is expected to be base64 encoded, and so will be pure ASCII. | |
54 hash.add((key + webSocketGUID).codeUnits); | |
55 return CryptoUtils.bytesToBase64(hash.close()); | |
56 } | |
57 | |
58 /// Creates a new WebSocket handling messaging across an existing socket. | |
59 /// | |
60 /// Because this is HTTP-API-agnostic, the initial [WebSocket handshake][] | |
61 /// must have already been completed on the socket before this is called. | |
62 /// | |
63 /// If [stream] is also a [StreamSink] (for example, if it's a "dart:io" | |
64 /// `Socket`), it will be used for both sending and receiving data. Otherwise, | |
65 /// it will be used for receiving data and [sink] will be used for sending it. | |
66 /// | |
67 /// [protocol] should be the protocol negotiated by this handshake, if any. | |
68 /// | |
69 /// If this is a WebSocket server, [serverSide] should be `true` (the | |
70 /// default); if it's a client, [serverSide] should be `false`. | |
71 /// | |
72 /// [WebSocket handshake]: https://tools.ietf.org/html/rfc6455#section-4 | |
73 factory CompatibleWebSocket(Stream<List<int>> stream, | |
74 {StreamSink<List<int>> sink, String protocol, bool serverSide: true}) { | |
75 if (sink == null) { | |
76 if (stream is! StreamSink) { | |
77 throw new ArgumentError("If stream isn't also a StreamSink, sink must " | |
78 "be passed explicitly."); | |
79 } | |
80 sink = stream as StreamSink; | |
81 } | |
82 | |
83 return new WebSocketImpl.fromSocket(stream, sink, protocol, serverSide); | |
84 } | |
85 | |
86 /// Closes the web socket connection. | |
87 /// | |
88 /// [closeCode] and [closeReason] are the [close code][] and [reason][] sent | |
89 /// to the remote peer, respectively. If they are omitted, the peer will see | |
90 /// a "no status received" code with no reason. | |
91 /// | |
92 /// [close code]: https://tools.ietf.org/html/rfc6455#section-7.1.5 | |
93 /// [reason]: https://tools.ietf.org/html/rfc6455#section-7.1.6 | |
94 Future close([int closeCode, String closeReason]); | |
95 } | |
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