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annotate webtty.js @ 122:6cfaf6d202be

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Improve the probability of detecting numpad 5. Firefox now, in some circumstances, thinks numpad 5 is the clear key, with keycode 12. This makes it detectable.
author John "Elwin" Edwards <elwin@sdf.org>
date Sun, 12 Aug 2012 08:22:55 -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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John "Elwin" Edwards <elwin@sdf.org>
parents:
diff changeset
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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John "Elwin" Edwards <elwin@sdf.org>
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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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John "Elwin" Edwards <elwin@sdf.org>
parents: 11
diff changeset
155 return null;
0
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John "Elwin" Edwards <elwin@sdf.org>
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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>
parents:
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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parents: 7
diff changeset
169 t = Math.floor(Number(formdata["w"]));
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parents: 7
diff changeset
170 if (t > 0 && t < 256)
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John "Elwin" Edwards <elwin@sdf.org>
parents: 7
diff changeset
171 w = t;
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John "Elwin" Edwards <elwin@sdf.org>
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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John "Elwin" Edwards <elwin@sdf.org>
parents: 7
diff changeset
176 h = t;
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John "Elwin" Edwards <elwin@sdf.org>
parents: 7
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>
parents: 81
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:
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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:
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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:
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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>
parents:
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
bd412f63ce0d Put this project under version control, finally.
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>
parents: 10
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));
481dcee353c9 webtty: switch all server responses to JSON.
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
bd412f63ce0d Put this project under version control, finally.
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>
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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/');