Mercurial > hg > rlgwebd
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> |
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date | Sun, 13 May 2012 20:50:13 -0700 |
parents | 481dcee353c9 |
children | 7466927c17a5 |
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 = []; |
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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) { |
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147 var jsonobj; |
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148 try { |
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149 jsonobj = JSON.parse(formtext); |
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150 } catch (e) { |
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151 if (e instanceof SyntaxError) |
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152 return null; |
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153 } |
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154 return jsonobj; |
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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(); |
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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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175 var nsession = new TermSession(sessid, h, w); |
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176 resheaders["Set-Cookie"] = "ID=" + sessid; |
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177 res.writeHead(200, resheaders); |
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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)); |
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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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183 } |
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184 |
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185 function findTermSession(req) { |
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186 var cookies = getCookies(req); |
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187 if ("id" in cookies) { |
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188 var sessid = cookies["id"]; |
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189 if (sessid in sessions) { |
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190 return sessions[sessid]; |
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191 } |
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192 } |
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193 return null; |
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194 } |
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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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198 if (nname == "" || nname == "/") |
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199 nname = "index.html"; |
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200 if (nname.match(/\/$/)) |
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201 path.join(nname, "index.html"); /* it was a directory */ |
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202 var realname = path.join(serveStaticRoot, nname); |
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203 var extension = path.extname(realname); |
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204 path.exists(realname, function (exists) { |
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205 var resheaders = {}; |
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206 if (!exists || !extension || extension == ".html") |
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207 resheaders["Content-Type"] = "text/html"; |
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208 else if (extension == ".png") |
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209 resheaders["Content-Type"] = "image/png"; |
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210 else if (extension == ".css") |
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211 resheaders["Content-Type"] = "text/css"; |
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212 else if (extension == ".js") |
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213 resheaders["Content-Type"] = "text/javascript"; |
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214 else if (extension == ".svg") |
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215 resheaders["Content-Type"] = "image/svg+xml"; |
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216 else |
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217 resheaders["Content-Type"] = "application/octet-stream"; |
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218 if (exists) { |
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219 /* Not nice, not sensible. First see if it's readable, then respond |
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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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222 fs.readFile(realname, function (error, data) { |
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223 if (error) throw error; |
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224 res.write(data); |
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225 res.end(); |
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226 }); |
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227 } |
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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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231 res.end(); |
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232 } |
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233 }); |
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234 return; |
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235 } |
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236 |
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237 function readFeed(res, term) { |
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238 res.writeHead(200, { "Content-Type": "text/plain" }); |
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239 if (term) { |
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240 var answer = {}; |
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241 var result = term.read(); |
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242 if (result == null) { |
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243 answer["t"] = "n"; |
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244 } |
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245 else { |
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246 answer["t"] = "d"; |
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247 answer["d"] = result.toString("hex"); |
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248 answer["n"] = term.nsend++; |
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249 } |
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250 res.write(JSON.stringify(answer)); |
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251 res.end(); |
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252 } |
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253 else { |
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254 sendError(res, 1); |
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255 } |
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256 } |
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257 |
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258 var errorcodes = [ "Generic Error", "Not logged in", "Invalid data" ]; |
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259 |
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260 function sendError(res, ecode) { |
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261 res.writeHead(200, { "Content-Type": "text/plain" }); |
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262 if (!(ecode >= 0 && ecode < errorcodes.length)) |
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263 ecode = 0; |
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264 res.write(JSON.stringify({"t": "E", "c": ecode, "s": errorcodes[ecode]})); |
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265 res.end(); |
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266 } |
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267 |
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268 function handler(req, res) { |
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269 /* default headers for the response */ |
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270 var resheaders = {'Content-Type': 'text/html'}; |
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271 /* The request body will be added to this as it arrives. */ |
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272 var reqbody = ""; |
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273 var formdata; |
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274 |
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275 /* Register a listener to get the body. */ |
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276 function moredata(chunk) { |
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277 reqbody += chunk; |
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278 } |
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279 req.on('data', moredata); |
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280 |
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281 /* This will send the response once the whole request is here. */ |
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282 function respond() { |
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283 var target = url.parse(req.url).pathname; |
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284 var cterm = findTermSession(req); |
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285 /* First figure out if the client is POSTing to a command interface. */ |
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286 if (req.method == 'POST') { |
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287 formdata = getFormValues(reqbody); |
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288 if (target == '/feed') { |
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289 if (!cterm) { |
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290 sendError(res, 1); |
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291 return; |
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292 } |
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293 if (formdata["t"] == "q") { |
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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") { |
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299 /* process the keys */ |
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300 hexstr = formdata["d"].replace(/[^0-9a-f]/gi, ""); |
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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/'); |