annotate webtty.js @ 13:bf7c26d0b66d

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