annotate webtty.js @ 111:f56fdfeed01a

Replace taking over games with forced saves. Instead of reusing the id, just SIGHUP the game process. This works whether it is using polling, WebSockets, or dgamelaunch.
author John "Elwin" Edwards <elwin@sdf.org>
date Sun, 15 Jul 2012 22:33:44 -0700
parents ad4229cf8321
children f14e92f6d955
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1 #!/usr/bin/env node
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2 var http = require('http');
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3 var url = require('url');
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4 var path = require('path');
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5 var fs = require('fs');
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6 var pty = require("/usr/local/lib/node_modules/pty.js");
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7
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8 var serveStaticRoot = "/home/elwin/hk/nodejs/rlg/s/";
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9 var ptyhelp = "/home/elwin/hk/nodejs/rlg/ptyhelper";
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10 var sessions = {};
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11
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12 var env_dontuse = {"TMUX": true, "TMUX_PANE": true};
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13
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14 /* Constructor for TermSessions. Note that it opens the terminal and
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15 * adds itself to the sessions dict.
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16 */
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17 function TermSession(sessid, h, w) {
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18 /* Set up the sizes. */
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19 w = Math.floor(Number(w));
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20 if (!(w > 0 && w < 256))
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21 w = 80;
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22 this.w = w;
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23 h = Math.floor(Number(h));
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24 if (!(h > 0 && h < 256))
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25 h = 25;
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26 this.h = h;
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27 /* Customize the environment. */
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28 var childenv = {};
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29 for (var key in process.env) {
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30 if (!(key in env_dontuse))
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31 childenv[key] = process.env[key];
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32 }
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33 var spawnopts = {"env": childenv, "cwd": process.env["HOME"],
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34 "rows": this.h, "cols": this.w};
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35 this.term = pty.spawn("bash", [], spawnopts);
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36 var ss = this;
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37 /* Eventually we'll need to make sure the sessid isn't in use yet. */
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38 this.sessid = sessid;
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39 this.alive = true;
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40 this.data = []; // Buffer for the process' output.
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41 this.nsend = 0; // Number to use for the next message sent.
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42 this.nrecv = 0; // Number expected on the next message received.
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43 this.msgQ = []; // Queue for messages that arrived out of order.
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44 this.term.on("data", function (buf) {
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45 ss.data.push(buf);
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46 });
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47 this.term.on("exit", function () {
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48 ss.alive = false;
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49 /* Wait for all the data to get collected */
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50 setTimeout(ss.cleanup, 1000);
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51 });
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52 this.write = function (data, n) {
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53 if (!this.alive) {
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54 /* Throw some kind of exception? */
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55 return;
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56 }
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57 if (n !== this.nrecv) {
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58 console.log("Session " + this.sessid + ": Expected message " + this.nrecv + ", got " + n);
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59 }
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60 this.nrecv = n + 1;
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61 this.term.write(data);
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62 };
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63 this.read = function () {
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64 if (this.data.length == 0)
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65 return null;
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66 var pos = 0;
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67 var i = 0;
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68 for (i = 0; i < this.data.length; i++)
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69 pos += Buffer.byteLength(this.data[i]);
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70 var nbuf = new Buffer(pos);
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71 var tptr;
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72 pos = 0;
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73 while (this.data.length > 0) {
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74 tptr = new Buffer(this.data.shift());
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75 tptr.copy(nbuf, pos);
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76 pos += tptr.length;
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77 }
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78 return nbuf;
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79 };
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80 this.close = function () {
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81 if (this.alive)
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82 this.term.kill('SIGHUP');
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83 };
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84 this.cleanup = function () {
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85 /* Call this when the child is dead. */
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86 if (this.alive)
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87 return;
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88 /* Give the client a chance to read any leftover data. */
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89 if (ss.data.length > 0)
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90 setTimeout(ss.remove, 8000);
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91 else
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92 ss.remove();
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93 };
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94 this.remove = function () {
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95 delete sessions[ss.sessid];
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96 console.log("Session " + this.sessid + " removed.");
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97 };
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98 sessions[sessid] = this;
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99 }
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100
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101 function randkey() {
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102 rnum = Math.floor(Math.random() * 65536 * 65536);
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103 hexstr = rnum.toString(16);
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104 while (hexstr.length < 8)
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105 hexstr = "0" + hexstr;
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106 return hexstr;
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107 }
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108
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109 /* Returns a list of the cookies in the request, obviously. */
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110 function getCookies(req) {
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111 cookies = [];
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112 if ("cookie" in req.headers) {
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113 cookstrs = req.headers["cookie"].split("; ");
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114 for (var i = 0; i < cookstrs.length; i++) {
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115 eqsign = cookstrs[i].indexOf("=");
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116 if (eqsign > 0) {
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117 name = cookstrs[i].slice(0, eqsign).toLowerCase();
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118 val = cookstrs[i].slice(eqsign + 1);
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119 cookies[name] = val;
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120 }
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121 else if (eqsign < 0)
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122 cookies[cookstrs[i]] = null;
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123 }
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124 }
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125 return cookies;
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126 }
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127
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128 function urlDec(encstr) {
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129 var decstr = "";
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130 var tnum;
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131 for (var i = 0; i < encstr.length; i++)
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132 {
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133 if (encstr.charAt(i) == "+")
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134 decstr += " ";
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135 else if (encstr.charAt(i) == "%")
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136 {
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137 tnum = Number("0x" + encstr.slice(i + 1, 2));
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138 if (!isNaN(tnum) && tnum >= 0)
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139 decstr += String.fromCharCode(tnum);
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140 i += 2;
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141 }
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142 else
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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143 decstr += encstr.charAt(i);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
144 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
145 return decstr;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
146 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
147
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
148 /* Returns the contents of a form */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
149 function getFormValues(formtext) {
13
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diff changeset
150 var jsonobj;
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John "Elwin" Edwards <elwin@sdf.org>
parents: 11
diff changeset
151 try {
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diff changeset
152 jsonobj = JSON.parse(formtext);
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diff changeset
153 } catch (e) {
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John "Elwin" Edwards <elwin@sdf.org>
parents: 11
diff changeset
154 if (e instanceof SyntaxError)
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diff changeset
155 return null;
0
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diff changeset
156 }
13
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diff changeset
157 return jsonobj;
0
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158 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
159
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John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
160 function login(req, res, formdata) {
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161 var resheaders = {'Content-Type': 'text/plain'};
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162 var sessid = randkey();
9
826a7ced69f8 Make the emulator screen resizable.
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parents: 7
diff changeset
163 /* The TermSession constructor will check these thoroughly too, but
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164 * you can't be too suspicious of client-supplied data. */
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165 var w = 80;
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166 var h = 25;
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parents: 7
diff changeset
167 var t;
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parents: 7
diff changeset
168 if ("w" in formdata) {
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diff changeset
169 t = Math.floor(Number(formdata["w"]));
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diff changeset
170 if (t > 0 && t < 256)
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diff changeset
171 w = t;
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parents: 7
diff changeset
172 }
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John "Elwin" Edwards <elwin@sdf.org>
parents: 7
diff changeset
173 if ("h" in formdata) {
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John "Elwin" Edwards <elwin@sdf.org>
parents: 7
diff changeset
174 t = Math.floor(Number(formdata["h"]));
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John "Elwin" Edwards <elwin@sdf.org>
parents: 7
diff changeset
175 if (t > 0 && t < 256)
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diff changeset
176 h = t;
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John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
177 }
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John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
178 var nsession = new TermSession(sessid, h, w);
0
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179 resheaders["Set-Cookie"] = "ID=" + sessid;
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John "Elwin" Edwards <elwin@sdf.org>
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180 res.writeHead(200, resheaders);
10
d051aad3e95f webtty: begin experimenting with JSON protocol.
John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
181 var logindict = {"login": true, "id": sessid, "w": w, "h": h};
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diff changeset
182 res.write(JSON.stringify(logindict));
0
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John "Elwin" Edwards <elwin@sdf.org>
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183 res.end();
86
ad4229cf8321 WebTTY: use the pty.js module.
John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
184 console.log("Started new session with key " + sessid + ", pid " + nsession.term.pid);
0
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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185 return;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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186 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
187
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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188 function findTermSession(req) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
189 var cookies = getCookies(req);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
190 if ("id" in cookies) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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191 var sessid = cookies["id"];
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John "Elwin" Edwards <elwin@sdf.org>
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192 if (sessid in sessions) {
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John "Elwin" Edwards <elwin@sdf.org>
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193 return sessions[sessid];
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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194 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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195 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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196 return null;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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197 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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198
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
199 function serveStatic(req, res, fname) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
200 var nname = path.normalize(fname);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
201 if (nname == "" || nname == "/")
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
202 nname = "index.html";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
203 if (nname.match(/\/$/))
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
204 path.join(nname, "index.html"); /* it was a directory */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
205 var realname = path.join(serveStaticRoot, nname);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
206 var extension = path.extname(realname);
81
e4773ac5d4d5 Switch to node v0.8.
John "Elwin" Edwards <elwin@sdf.org>
parents: 15
diff changeset
207 fs.exists(realname, function (exists) {
0
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parents:
diff changeset
208 var resheaders = {};
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
209 if (!exists || !extension || extension == ".html")
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
210 resheaders["Content-Type"] = "text/html";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
211 else if (extension == ".png")
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
212 resheaders["Content-Type"] = "image/png";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
213 else if (extension == ".css")
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
214 resheaders["Content-Type"] = "text/css";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
215 else if (extension == ".js")
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
216 resheaders["Content-Type"] = "text/javascript";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
217 else if (extension == ".svg")
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
218 resheaders["Content-Type"] = "image/svg+xml";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
219 else
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
220 resheaders["Content-Type"] = "application/octet-stream";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
221 if (exists) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
222 /* Not nice, not sensible. First see if it's readable, then respond
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
223 * 200 or 500. Don't throw nasty errors. */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
224 res.writeHead(200, resheaders);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
225 fs.readFile(realname, function (error, data) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
226 if (error) throw error;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
227 res.write(data);
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John "Elwin" Edwards <elwin@sdf.org>
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228 res.end();
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
229 });
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
230 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
231 else {
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John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
232 res.writeHead(404, resheaders);
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John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
233 res.write("<html><head><title>" + nname + "</title></head>\n<body><h1>" + nname + " Not Found</h1></body></html>\n");
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
234 res.end();
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
235 }
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
236 });
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
237 return;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
238 }
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
239
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
240 function readFeed(res, term) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
241 res.writeHead(200, { "Content-Type": "text/plain" });
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
242 if (term) {
11
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
243 var answer = {};
0
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
244 var result = term.read();
11
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
245 if (result == null) {
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
246 answer["t"] = "n";
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
247 }
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
248 else {
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
249 answer["t"] = "d";
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
250 answer["d"] = result.toString("hex");
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
251 answer["n"] = term.nsend++;
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
252 }
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
253 res.write(JSON.stringify(answer));
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John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
254 res.end();
0
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John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
255 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
256 else {
11
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
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diff changeset
257 sendError(res, 1);
0
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
258 }
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
259 }
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
260
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
261 var errorcodes = [ "Generic Error", "Not logged in", "Invalid data" ];
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
262
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
263 function sendError(res, ecode) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
264 res.writeHead(200, { "Content-Type": "text/plain" });
11
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
265 if (!(ecode >= 0 && ecode < errorcodes.length))
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
266 ecode = 0;
481dcee353c9 webtty: switch all server responses to JSON.
John "Elwin" Edwards <elwin@sdf.org>
parents: 10
diff changeset
267 res.write(JSON.stringify({"t": "E", "c": ecode, "s": errorcodes[ecode]}));
0
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
268 res.end();
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
269 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
270
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
271 function handler(req, res) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
272 /* default headers for the response */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
273 var resheaders = {'Content-Type': 'text/html'};
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
274 /* The request body will be added to this as it arrives. */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
275 var reqbody = "";
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
276 var formdata;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
277
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
278 /* Register a listener to get the body. */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
279 function moredata(chunk) {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
280 reqbody += chunk;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
281 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
282 req.on('data', moredata);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
283
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
284 /* This will send the response once the whole request is here. */
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
285 function respond() {
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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
286 var target = url.parse(req.url).pathname;
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
287 var cterm = findTermSession(req);
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
288 /* First figure out if the client is POSTing to a command interface. */
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289 if (req.method == 'POST') {
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290 formdata = getFormValues(reqbody);
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291 if (target == '/feed') {
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292 if (!cterm) {
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293 sendError(res, 1);
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294 return;
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295 }
13
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296 if (formdata["t"] == "q") {
0
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297 /* The client wants to quit. */
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298 // FIXME need to send a message back to the client
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299 cterm.close();
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300 }
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301 else if (formdata["t"] == "d" && typeof(formdata["d"]) == "string") {
0
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302 /* process the keys */
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303 hexstr = formdata["d"].replace(/[^0-9a-f]/gi, "");
0
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304 if (hexstr.length % 2 != 0) {
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305 sendError(res, 2);
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306 return;
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307 }
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308 keybuf = new Buffer(hexstr, "hex");
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7466927c17a5 webtty.js: check message order.
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309 cterm.write(keybuf, formdata["n"]);
0
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310 }
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311 readFeed(res, cterm);
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312 }
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313 else if (target == "/login") {
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314 login(req, res, formdata);
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315 }
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316 else {
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317 res.writeHead(405, resheaders);
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318 res.end();
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319 }
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320 }
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321 else if (req.method == 'GET' || req.method == 'HEAD') {
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322 if (target == '/feed') {
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323 if (!cterm) {
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324 sendError(res, 1);
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325 return;
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326 }
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327 readFeed(res, cterm);
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328 }
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329 /* Default page, create a new term */
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330 /* FIXME New term not created anymore, is a special case still needed? */
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331 else if (target == '/') {
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332 serveStatic(req, res, "/");
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333 }
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334 else /* Go look for it in the filesystem */
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335 serveStatic(req, res, target);
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336 }
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337 else { /* Some other method */
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338 res.writeHead(501, resheaders);
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339 res.write("<html><head><title>501</title></head>\n<body><h1>501 Not Implemented</h1></body></html>\n");
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340 res.end();
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341 }
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342 return;
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343 }
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344 req.on('end', respond);
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345
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346 }
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347
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348 process.on("exit", function () {
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349 for (var sessid in sessions) {
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350 if (sessions[sessid].alive)
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351 sessions[sessid].term.kill('SIGHUP');
0
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352 }
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353 console.log("Quitting...");
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354 return;
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355 });
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356
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357 process.env["TERM"] = "xterm-256color";
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358 http.createServer(handler).listen(8080, "127.0.0.1");
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359 console.log('Server running at http://127.0.0.1:8080/');