prosody
355eae2f9ba8
net/websocket.lua

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net/websocket.lua @ 11015:355eae2f9ba8 0.11

net.http: Re-expose destroy_request() function This was accidentally turned private in 647adfd8f738 as part of refactoring for Lua 5.2+.
author Matthew Wild <mwild1@gmail.com>
date Sat, 08 Aug 2020 13:11:11 +0100
parent 8893:eb710675f7f8
child 10112:b327f2870382
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1 -- Prosody IM
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2 -- Copyright (C) 2012 Florian Zeitz
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3 -- Copyright (C) 2014 Daurnimator
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local t_concat = table.concat;
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10
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11 local http = require "net.http";
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12 local frames = require "net.websocket.frames";
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13 local base64 = require "util.encodings".base64;
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14 local sha1 = require "util.hashes".sha1;
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15 local random_bytes = require "util.random".bytes;
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16 local timer = require "util.timer";
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17 local log = require "util.logger".init "websocket";
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18
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19 local close_timeout = 3; -- Seconds to wait after sending close frame until closing connection.
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20
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21 local websockets = {};
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22
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23 local websocket_listeners = {};
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24 function websocket_listeners.ondisconnect(conn, err)
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25 local s = websockets[conn];
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26 websockets[conn] = nil;
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27 if s.close_timer then
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28 timer.stop(s.close_timer);
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29 s.close_timer = nil;
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30 end
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31 s.readyState = 3;
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32 if s.close_code == nil and s.onerror then s:onerror(err); end
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33 if s.onclose then s:onclose(s.close_code, s.close_message or err); end
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34 end
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35
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36 function websocket_listeners.ondetach(conn)
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37 websockets[conn] = nil;
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38 end
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39
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40 local function fail(s, code, reason)
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41 log("warn", "WebSocket connection failed, closing. %d %s", code, reason);
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42 s:close(code, reason);
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43 s.conn:close();
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44 return false
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45 end
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46
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47 function websocket_listeners.onincoming(conn, buffer, err) -- luacheck: ignore 212/err
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48 local s = websockets[conn];
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49 s.readbuffer = s.readbuffer..buffer;
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50 while true do
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51 local frame, len = frames.parse(s.readbuffer);
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52 if frame == nil then break end
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53 s.readbuffer = s.readbuffer:sub(len+1);
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54
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55 log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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56
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57 -- Error cases
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58 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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59 return fail(s, 1002, "Reserved bits not zero");
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60 end
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61
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62 if frame.opcode < 0x8 then
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63 local databuffer = s.databuffer;
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64 if frame.opcode == 0x0 then -- Continuation frames
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65 if not databuffer then
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66 return fail(s, 1002, "Unexpected continuation frame");
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67 end
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68 databuffer[#databuffer+1] = frame.data;
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69 elseif frame.opcode == 0x1 or frame.opcode == 0x2 then -- Text or Binary frame
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70 if databuffer then
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71 return fail(s, 1002, "Continuation frame expected");
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72 end
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73 databuffer = {type=frame.opcode, frame.data};
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74 s.databuffer = databuffer;
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75 else
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76 return fail(s, 1002, "Reserved opcode");
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77 end
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78 if frame.FIN then
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79 s.databuffer = nil;
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80 if s.onmessage then
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81 s:onmessage(t_concat(databuffer), databuffer.type);
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82 end
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83 end
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84 else -- Control frame
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85 if frame.length > 125 then -- Control frame with too much payload
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86 return fail(s, 1002, "Payload too large");
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87 elseif not frame.FIN then -- Fragmented control frame
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88 return fail(s, 1002, "Fragmented control frame");
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89 end
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90 if frame.opcode == 0x8 then -- Close request
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91 if frame.length == 1 then
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92 return fail(s, 1002, "Close frame with payload, but too short for status code");
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93 end
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94 local status_code, message = frames.parse_close(frame.data);
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95 if status_code == nil then
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96 --[[ RFC 6455 7.4.1
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97 1005 is a reserved value and MUST NOT be set as a status code in a
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98 Close control frame by an endpoint. It is designated for use in
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99 applications expecting a status code to indicate that no status
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100 code was actually present.
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101 ]]
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102 status_code = 1005
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103 elseif status_code < 1000 then
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104 return fail(s, 1002, "Closed with invalid status code");
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105 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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106 return fail(s, 1002, "Closed with reserved status code");
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107 end
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108 s.close_code, s.close_message = status_code, message;
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109 s:close(1000);
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110 return true;
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111 elseif frame.opcode == 0x9 then -- Ping frame
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112 frame.opcode = 0xA;
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113 frame.MASK = true; -- RFC 6455 6.1.5: If the data is being sent by the client, the frame(s) MUST be masked
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114 conn:write(frames.build(frame));
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115 elseif frame.opcode == 0xA then -- Pong frame
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116 log("debug", "Received unexpected pong frame: " .. tostring(frame.data));
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117 else
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118 return fail(s, 1002, "Reserved opcode");
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119 end
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120 end
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121 end
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122 return true;
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123 end
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124
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125 local websocket_methods = {};
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126 local function close_timeout_cb(now, timerid, s) -- luacheck: ignore 212/now 212/timerid
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127 s.close_timer = nil;
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128 log("warn", "Close timeout waiting for server to close, closing manually.");
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129 s.conn:close();
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130 end
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131 function websocket_methods:close(code, reason)
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
132 if self.readyState < 2 then
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
133 code = code or 1000;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
134 log("debug", "closing WebSocket with code %i: %s" , code , tostring(reason));
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parents:
diff changeset
135 self.readyState = 2;
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Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
136 local conn = self.conn;
fb38b2c77a72 net.websocket: Fix incompatibility with net.http changes
Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
137 conn:write(frames.build_close(code, reason, true));
6389
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
138 -- Do not close socket straight away, wait for acknowledgement from server.
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
139 self.close_timer = timer.add_task(close_timeout, close_timeout_cb, self);
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
140 elseif self.readyState == 2 then
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
141 log("debug", "tried to close a closing WebSocket, closing the raw socket.");
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
142 -- Stop timer
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
143 if self.close_timer then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
144 timer.stop(self.close_timer);
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
145 self.close_timer = nil;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
146 end
8892
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parents: 8189
diff changeset
147 local conn = self.conn;
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Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
148 conn:close();
6389
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parents:
diff changeset
149 else
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
150 log("debug", "tried to close a closed WebSocket, ignoring.");
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parents:
diff changeset
151 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
152 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
153 function websocket_methods:send(data, opcode)
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
154 if self.readyState < 1 then
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
155 return nil, "WebSocket not open yet, unable to send data.";
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
156 elseif self.readyState >= 2 then
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
157 return nil, "WebSocket closed, unable to send data.";
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
158 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
159 if opcode == "text" or opcode == nil then
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
160 opcode = 0x1;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
161 elseif opcode == "binary" then
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
162 opcode = 0x2;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
163 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
164 local frame = {
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daurnimator <quae@daurnimator.com>
parents:
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165 FIN = true;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
166 MASK = true; -- RFC 6455 6.1.5: If the data is being sent by the client, the frame(s) MUST be masked
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
167 opcode = opcode;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
168 data = tostring(data);
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
169 };
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
170 log("debug", "WebSocket sending frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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parents: 8189
diff changeset
171 return self.conn:write(frames.build(frame));
6389
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parents:
diff changeset
172 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
173
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
174 local websocket_metatable = {
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
175 __index = websocket_methods;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
176 };
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
177
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
178 local function connect(url, ex, listeners)
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
179 ex = ex or {};
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
180
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
181 --[[RFC 6455 4.1.7:
6389
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
182 The request MUST include a header field with the name
6395
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
183 |Sec-WebSocket-Key|. The value of this header field MUST be a
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
184 nonce consisting of a randomly selected 16-byte value that has
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
185 been base64-encoded (see Section 4 of [RFC4648]). The nonce
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parents:
diff changeset
186 MUST be selected randomly for each connection.
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parents:
diff changeset
187 ]]
6389
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
188 local key = base64.encode(random_bytes(16));
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
189
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
190 -- Either a single protocol string or an array of protocol strings.
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
191 local protocol = ex.protocol;
6396
17b54f523796 Check Sec-WebSocket-Protocol header
Florian Zeitz <florob@babelmonkeys.de>
parents: 6395
diff changeset
192 if type(protocol) == "string" then
6407
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
193 protocol = { protocol, [protocol] = true };
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
194 elseif type(protocol) == "table" and protocol[1] then
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
195 for _, v in ipairs(protocol) do
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
196 protocol[v] = true;
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
197 end
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
198 else
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
199 protocol = nil;
6389
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parents:
diff changeset
200 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
201
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
202 local headers = {
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
203 ["Upgrade"] = "websocket";
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
204 ["Connection"] = "Upgrade";
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
205 ["Sec-WebSocket-Key"] = key;
6407
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
206 ["Sec-WebSocket-Protocol"] = protocol and t_concat(protocol, ", ");
6395
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
207 ["Sec-WebSocket-Version"] = "13";
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
208 ["Sec-WebSocket-Extensions"] = ex.extensions;
6389
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
209 }
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
210 if ex.headers then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
211 for k,v in pairs(ex.headers) do
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
212 headers[k] = v;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
213 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
214 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
215
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
216 local s = setmetatable({
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
217 readbuffer = "";
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
218 databuffer = nil;
8892
fb38b2c77a72 net.websocket: Fix incompatibility with net.http changes
Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
219 conn = nil;
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
220 close_code = nil;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
221 close_message = nil;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
222 close_timer = nil;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
223 readyState = 0;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
224 protocol = nil;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
225
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
226 url = url;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
227
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
228 onopen = listeners.onopen;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
229 onclose = listeners.onclose;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
230 onmessage = listeners.onmessage;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
231 onerror = listeners.onerror;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
232 }, websocket_metatable);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
233
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
234 local http_url = url:gsub("^(ws)", "http");
7759
69706084bdfe net.websocket: Ignore unused argument warnings [luacheck]
Kim Alvefur <zash@zash.se>
parents: 6455
diff changeset
235 local http_req = http.request(http_url, { -- luacheck: ignore 211/http_req
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
236 method = "GET";
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
237 headers = headers;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
238 sslctx = ex.sslctx;
8893
eb710675f7f8 net.websocket: Honour ex.insecure to match net.http's new parameter for that
Matthew Wild <mwild1@gmail.com>
parents: 8892
diff changeset
239 insecure = ex.insecure;
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
240 }, function(b, c, r, http_req)
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
241 if c ~= 101
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
242 or r.headers["connection"]:lower() ~= "upgrade"
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
243 or r.headers["upgrade"] ~= "websocket"
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
244 or r.headers["sec-websocket-accept"] ~= base64.encode(sha1(key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"))
6407
4bbd198cf3e6 net.websocket: Fix handling of 'protocol' argument
Kim Alvefur <zash@zash.se>
parents: 6398
diff changeset
245 or (protocol and not protocol[r.headers["sec-websocket-protocol"]])
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
246 then
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
247 s.readyState = 3;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
248 log("warn", "WebSocket connection to %s failed: %s", url, tostring(b));
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
249 if s.onerror then s:onerror("connecting-failed"); end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
250 return;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
251 end
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
252
6395
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
253 s.protocol = r.headers["sec-websocket-protocol"];
6389
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
254
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
255 -- Take possession of socket from http
8892
fb38b2c77a72 net.websocket: Fix incompatibility with net.http changes
Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
256 local conn = http_req.conn;
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
257 http_req.conn = nil;
8892
fb38b2c77a72 net.websocket: Fix incompatibility with net.http changes
Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
258 s.conn = conn;
fb38b2c77a72 net.websocket: Fix incompatibility with net.http changes
Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
259 websockets[conn] = s;
fb38b2c77a72 net.websocket: Fix incompatibility with net.http changes
Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
260 conn:setlistener(websocket_listeners);
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
261
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
262 log("debug", "WebSocket connected successfully to %s", url);
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
263 s.readyState = 1;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
264 if s.onopen then s:onopen(); end
8892
fb38b2c77a72 net.websocket: Fix incompatibility with net.http changes
Matthew Wild <mwild1@gmail.com>
parents: 8189
diff changeset
265 websocket_listeners.onincoming(conn, b);
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
266 end);
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
267
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
268 return s;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
269 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
270
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
271 return {
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
272 connect = connect;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
273 };