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/*!
* socket.io-node
* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
/**
* Module requirements.
*/
var HTTPPolling = require('./http-polling');
var jsonpolling_re = /^\d+$/
/**
* Export the constructor.
*/
exports = module.exports = JSONPPolling;
/**
* JSON-P polling transport.
*
* @api public
*/
function JSONPPolling (mng, data, req) {
HTTPPolling.call(this, mng, data, req);
this.head = 'io.j[0](';
this.foot = ');';
if (data.query.i && jsonpolling_re.test(data.query.i)) {
this.head = 'io.j[' + data.query.i + '](';
}
};
/**
* Inherits from Transport.
*/
JSONPPolling.prototype.__proto__ = HTTPPolling.prototype;
/**
* Transport name
*
* @api public
*/
JSONPPolling.prototype.name = 'jsonppolling';
/**
* Make sure POST are decoded.
*/
JSONPPolling.prototype.postEncoded = true;
/**
* Handles incoming data.
* Due to a bug in \n handling by browsers, we expect a JSONified string.
*
* @api private
*/
JSONPPolling.prototype.onData = function (data) {
try {
data = JSON.parse(data);
} catch (e) {
this.error('parse', 'reconnect');
return;
}
HTTPPolling.prototype.onData.call(this, data);
};
/**
* Performs the write.
*
* @api private
*/
JSONPPolling.prototype.doWrite = function (data) {
HTTPPolling.prototype.doWrite.call(this);
var data = data === undefined
? '' : this.head + JSON.stringify(data) + this.foot;
this.response.writeHead(200, {
'Content-Type': 'text/javascript; charset=UTF-8'
, 'Content-Length': Buffer.byteLength(data)
, 'Connection': 'Keep-Alive'
, 'X-XSS-Protection': '0'
});
this.response.write(data);
this.log.debug(this.name + ' writing', data);
};
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