Mercurial > hg > rlgwebd
annotate webtty.js @ 61:071ec6b1ec03
RLG-Web client: initialize and restore the terminal when watching.
Since watchers might not get the curses initialization and ending
sequences, the terminal emulator needs to be set up for and restored
after watching.
author | John "Elwin" Edwards <elwin@sdf.org> |
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date | Tue, 19 Jun 2012 20:08:05 -0700 |
parents | 7466927c17a5 |
children | e4773ac5d4d5 |
rev | line source |
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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 |
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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 = []; // Buffer for the process' output. |
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42 this.nsend = 0; // Number to use for the next message sent. |
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43 this.nrecv = 0; // Number expected on the next message received. |
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44 this.msgQ = []; // Queue for messages that arrived out of order. |
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45 this.child.stdout.on("data", function (buf) { |
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46 ss.data.push(buf); |
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47 }); |
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48 this.child.stderr.on("data", function (buf) { |
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49 ss.data.push(buf); |
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50 }); |
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51 this.child.on("exit", function (code, signal) { |
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52 ss.exitcode = (code != null ? code : 255); |
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53 ss.alive = false; |
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54 /* Wait for all the data to get collected */ |
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55 setTimeout(ss.cleanup, 1000); |
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56 }); |
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57 this.write = function (data, n) { |
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58 if (!this.alive) { |
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59 /* Throw some kind of exception? */ |
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60 return; |
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61 } |
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62 if (n !== this.nrecv) { |
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63 console.log("Session " + this.sessid + ": Expected message " + this.nrecv + ", got " + n); |
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64 } |
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65 this.nrecv = n + 1; |
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66 this.child.stdin.write(data); |
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67 }; |
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68 this.read = function () { |
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69 if (this.data.length == 0) |
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70 return null; |
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71 var pos = 0; |
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72 var i = 0; |
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73 for (i = 0; i < this.data.length; i++) |
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74 pos += this.data[i].length; |
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75 var nbuf = new Buffer(pos); |
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76 var tptr; |
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77 pos = 0; |
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78 while (this.data.length > 0) { |
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79 tptr = this.data.shift(); |
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80 tptr.copy(nbuf, pos); |
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81 pos += tptr.length; |
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82 } |
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83 return nbuf; |
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84 }; |
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85 this.close = function () { |
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86 if (this.alive) |
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87 this.child.kill('SIGHUP'); |
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88 }; |
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89 this.cleanup = function () { |
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90 /* Call this when the child is dead. */ |
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91 if (this.alive) |
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92 return; |
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93 /* Give the client a chance to read any leftover data. */ |
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94 if (ss.data.length > 0) |
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95 setTimeout(ss.remove, 8000); |
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96 else |
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97 ss.remove(); |
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98 }; |
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99 this.remove = function () { |
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100 delete sessions[ss.sessid]; |
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101 console.log("Session " + this.sessid + " removed."); |
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102 }; |
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103 sessions[sessid] = this; |
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104 } |
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105 |
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106 function randkey() { |
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107 rnum = Math.floor(Math.random() * 65536 * 65536); |
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108 hexstr = rnum.toString(16); |
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109 while (hexstr.length < 8) |
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110 hexstr = "0" + hexstr; |
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111 return hexstr; |
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112 } |
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113 |
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114 /* Returns a list of the cookies in the request, obviously. */ |
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115 function getCookies(req) { |
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116 cookies = []; |
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117 if ("cookie" in req.headers) { |
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118 cookstrs = req.headers["cookie"].split("; "); |
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119 for (var i = 0; i < cookstrs.length; i++) { |
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120 eqsign = cookstrs[i].indexOf("="); |
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121 if (eqsign > 0) { |
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122 name = cookstrs[i].slice(0, eqsign).toLowerCase(); |
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123 val = cookstrs[i].slice(eqsign + 1); |
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124 cookies[name] = val; |
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125 } |
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126 else if (eqsign < 0) |
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127 cookies[cookstrs[i]] = null; |
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128 } |
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129 } |
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130 return cookies; |
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131 } |
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132 |
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133 function urlDec(encstr) { |
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134 var decstr = ""; |
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135 var tnum; |
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136 for (var i = 0; i < encstr.length; i++) |
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137 { |
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138 if (encstr.charAt(i) == "+") |
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139 decstr += " "; |
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140 else if (encstr.charAt(i) == "%") |
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141 { |
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142 tnum = Number("0x" + encstr.slice(i + 1, 2)); |
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143 if (!isNaN(tnum) && tnum >= 0) |
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144 decstr += String.fromCharCode(tnum); |
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145 i += 2; |
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146 } |
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147 else |
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148 decstr += encstr.charAt(i); |
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149 } |
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150 return decstr; |
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151 } |
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152 |
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153 /* Returns the contents of a form */ |
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154 function getFormValues(formtext) { |
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155 var jsonobj; |
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156 try { |
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157 jsonobj = JSON.parse(formtext); |
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158 } catch (e) { |
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159 if (e instanceof SyntaxError) |
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160 return null; |
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161 } |
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162 return jsonobj; |
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163 } |
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164 |
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165 function login(req, res, formdata) { |
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166 var resheaders = {'Content-Type': 'text/plain'}; |
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167 var sessid = randkey(); |
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168 /* The TermSession constructor will check these thoroughly too, but |
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169 * you can't be too suspicious of client-supplied data. */ |
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170 var w = 80; |
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171 var h = 25; |
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172 var t; |
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173 if ("w" in formdata) { |
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174 t = Math.floor(Number(formdata["w"])); |
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175 if (t > 0 && t < 256) |
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176 w = t; |
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177 } |
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178 if ("h" in formdata) { |
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179 t = Math.floor(Number(formdata["h"])); |
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180 if (t > 0 && t < 256) |
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181 h = t; |
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182 } |
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183 var nsession = new TermSession(sessid, h, w); |
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184 resheaders["Set-Cookie"] = "ID=" + sessid; |
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185 res.writeHead(200, resheaders); |
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186 var logindict = {"login": true, "id": sessid, "w": w, "h": h}; |
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187 res.write(JSON.stringify(logindict)); |
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188 res.end(); |
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189 console.log("Started new session with key " + sessid + ", pid " + nsession.child.pid); |
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190 return; |
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191 } |
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192 |
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193 function findTermSession(req) { |
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194 var cookies = getCookies(req); |
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195 if ("id" in cookies) { |
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196 var sessid = cookies["id"]; |
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197 if (sessid in sessions) { |
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198 return sessions[sessid]; |
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199 } |
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200 } |
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201 return null; |
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202 } |
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203 |
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204 function serveStatic(req, res, fname) { |
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205 var nname = path.normalize(fname); |
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206 if (nname == "" || nname == "/") |
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207 nname = "index.html"; |
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208 if (nname.match(/\/$/)) |
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209 path.join(nname, "index.html"); /* it was a directory */ |
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210 var realname = path.join(serveStaticRoot, nname); |
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211 var extension = path.extname(realname); |
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212 path.exists(realname, function (exists) { |
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213 var resheaders = {}; |
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214 if (!exists || !extension || extension == ".html") |
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215 resheaders["Content-Type"] = "text/html"; |
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216 else if (extension == ".png") |
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217 resheaders["Content-Type"] = "image/png"; |
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218 else if (extension == ".css") |
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219 resheaders["Content-Type"] = "text/css"; |
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220 else if (extension == ".js") |
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221 resheaders["Content-Type"] = "text/javascript"; |
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222 else if (extension == ".svg") |
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223 resheaders["Content-Type"] = "image/svg+xml"; |
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224 else |
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225 resheaders["Content-Type"] = "application/octet-stream"; |
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226 if (exists) { |
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227 /* Not nice, not sensible. First see if it's readable, then respond |
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228 * 200 or 500. Don't throw nasty errors. */ |
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229 res.writeHead(200, resheaders); |
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230 fs.readFile(realname, function (error, data) { |
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231 if (error) throw error; |
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232 res.write(data); |
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233 res.end(); |
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234 }); |
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235 } |
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236 else { |
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237 res.writeHead(404, resheaders); |
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238 res.write("<html><head><title>" + nname + "</title></head>\n<body><h1>" + nname + " Not Found</h1></body></html>\n"); |
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239 res.end(); |
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240 } |
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241 }); |
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242 return; |
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243 } |
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244 |
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245 function readFeed(res, term) { |
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246 res.writeHead(200, { "Content-Type": "text/plain" }); |
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247 if (term) { |
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248 var answer = {}; |
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249 var result = term.read(); |
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250 if (result == null) { |
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251 answer["t"] = "n"; |
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252 } |
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253 else { |
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254 answer["t"] = "d"; |
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255 answer["d"] = result.toString("hex"); |
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256 answer["n"] = term.nsend++; |
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257 } |
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258 res.write(JSON.stringify(answer)); |
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259 res.end(); |
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260 } |
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261 else { |
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262 sendError(res, 1); |
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263 } |
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264 } |
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265 |
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266 var errorcodes = [ "Generic Error", "Not logged in", "Invalid data" ]; |
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267 |
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268 function sendError(res, ecode) { |
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269 res.writeHead(200, { "Content-Type": "text/plain" }); |
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270 if (!(ecode >= 0 && ecode < errorcodes.length)) |
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271 ecode = 0; |
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272 res.write(JSON.stringify({"t": "E", "c": ecode, "s": errorcodes[ecode]})); |
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273 res.end(); |
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274 } |
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275 |
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276 function handler(req, res) { |
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277 /* default headers for the response */ |
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278 var resheaders = {'Content-Type': 'text/html'}; |
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279 /* The request body will be added to this as it arrives. */ |
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280 var reqbody = ""; |
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281 var formdata; |
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282 |
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283 /* Register a listener to get the body. */ |
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284 function moredata(chunk) { |
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285 reqbody += chunk; |
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286 } |
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287 req.on('data', moredata); |
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288 |
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289 /* This will send the response once the whole request is here. */ |
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290 function respond() { |
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291 var target = url.parse(req.url).pathname; |
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292 var cterm = findTermSession(req); |
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293 /* First figure out if the client is POSTing to a command interface. */ |
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294 if (req.method == 'POST') { |
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295 formdata = getFormValues(reqbody); |
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296 if (target == '/feed') { |
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297 if (!cterm) { |
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298 sendError(res, 1); |
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299 return; |
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300 } |
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301 if (formdata["t"] == "q") { |
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302 /* The client wants to quit. */ |
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303 // FIXME need to send a message back to the client |
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304 cterm.close(); |
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305 } |
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306 else if (formdata["t"] == "d" && typeof(formdata["d"]) == "string") { |
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307 /* process the keys */ |
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308 hexstr = formdata["d"].replace(/[^0-9a-f]/gi, ""); |
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309 if (hexstr.length % 2 != 0) { |
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310 sendError(res, 2); |
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311 return; |
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312 } |
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313 keybuf = new Buffer(hexstr, "hex"); |
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314 cterm.write(keybuf, formdata["n"]); |
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315 } |
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316 readFeed(res, cterm); |
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317 } |
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318 else if (target == "/login") { |
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319 login(req, res, formdata); |
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320 } |
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321 else { |
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322 res.writeHead(405, resheaders); |
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323 res.end(); |
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324 } |
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325 } |
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326 else if (req.method == 'GET' || req.method == 'HEAD') { |
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327 if (target == '/feed') { |
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328 if (!cterm) { |
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329 sendError(res, 1); |
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330 return; |
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331 } |
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332 readFeed(res, cterm); |
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333 } |
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334 /* Default page, create a new term */ |
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335 /* FIXME New term not created anymore, is a special case still needed? */ |
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336 else if (target == '/') { |
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337 serveStatic(req, res, "/"); |
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338 } |
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339 else /* Go look for it in the filesystem */ |
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340 serveStatic(req, res, target); |
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341 } |
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342 else { /* Some other method */ |
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343 res.writeHead(501, resheaders); |
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344 res.write("<html><head><title>501</title></head>\n<body><h1>501 Not Implemented</h1></body></html>\n"); |
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345 res.end(); |
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346 } |
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347 return; |
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348 } |
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349 req.on('end', respond); |
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350 |
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351 } |
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352 |
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353 process.on("exit", function () { |
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354 for (var sessid in sessions) { |
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355 if (sessions[sessid].alive) |
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356 sessions[sessid].child.kill('SIGHUP'); |
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357 } |
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358 console.log("Quitting..."); |
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359 return; |
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360 }); |
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361 |
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362 process.env["TERM"] = "xterm-256color"; |
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363 http.createServer(handler).listen(8080, "127.0.0.1"); |
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364 console.log('Server running at http://127.0.0.1:8080/'); |