/js/lib/Socket.IO-node/lib/socket.io/transports/xhr-multipart.js

  1
  2/*!
  3 * Socket.IO - transports - Multipart
  4 * Copyright (c) 2010-2011 Guillermo Rauch <guillermo@learnboost.com>
  5 * MIT Licensed
  6 */
  7
  8var Client = require('../client')
  9  , qs = require('querystring');
 10
 11/**
 12 * Expose `Multipart`.
 13 */
 14
 15module.exports = Multipart;
 16
 17/**
 18 * Initialize a `Multipart` client.
 19 *
 20 * @api private
 21 */
 22
 23function Multipart() {
 24  Client.apply(this, arguments);
 25};
 26
 27/**
 28 * Inherit from `Client.prototype`.
 29 */
 30
 31Multipart.prototype.__proto__ = Client.prototype;
 32
 33/**
 34 * Connection implementation.
 35 * 
 36 * @api private
 37 */
 38
 39Multipart.prototype._onConnect = function(req, res){
 40  var self = this
 41    , body = '';
 42
 43  // https://developer.mozilla.org/En/HTTP_Access_Control
 44  if (req.headers.origin && this._verifyOrigin(req.headers.origin)){
 45    res.setHeader('Access-Control-Allow-Origin', '*');
 46    res.setHeader('Access-Control-Allow-Credentials', 'true');
 47  }
 48
 49  if (typeof req.headers['access-control-request-method'] !== 'undefined'){
 50    // CORS preflight message
 51    res.setHeader('Access-Control-Allow-Methods', req.headers['access-control-request-method']);
 52    res.end('ok');
 53    return;
 54  }
 55
 56  switch (req.method){
 57    case 'GET':
 58      Client.prototype._onConnect.call(this, req, res);
 59      res.setHeader('Content-Type', 'multipart/x-mixed-replace;boundary="socketio"');
 60      res.setHeader('Connection', 'keep-alive');
 61      req.connection.on('end', function(){ self._onClose(); });
 62      res.useChunkedEncodingByDefault = false;
 63      res.shouldKeepAlive = true;
 64      res.write("--socketio\n");
 65      if ('flush' in res) res.flush();
 66      this._payload();
 67      break;
 68      
 69    case 'POST':
 70      res.setHeader('Content-Type', 'text/plain');
 71      req.on('data', function(chunk){ body += chunk });
 72      req.on('end', function(){
 73        try {
 74          var msg = qs.parse(body);
 75          self._onMessage(msg.data);
 76        } catch(e){
 77          self.listener.log('xhr-multipart message handler error - ' + e.stack);
 78        }
 79        res.end('ok');
 80        body = '';
 81      });
 82      break;
 83  }
 84};
 85
 86/**
 87 * Write implementation.
 88 * 
 89 * @param {String} message
 90 * @api private
 91 */
 92  
 93Multipart.prototype._write = function(message){
 94  if (this._open){
 95    var res = this.response
 96      , charset = '';
 97
 98    if (1 == message.length && 6 == message.charCodeAt(0))
 99      charset = '; charset=us-ascii';
100  
101    res.write("Content-Type: text/plain" + charset + "\n\n");
102    res.write(message + "\n");
103    res.write("--socketio\n");
104  }
105};