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/*!
* Connect - bodyParser
* Copyright(c) 2010 Sencha Inc.
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Module dependencies.
*/
var qs = require('qs');
/**
* Extract the mime type from the given request's
* _Content-Type_ header.
*
* @param {IncomingMessage} req
* @return {String}
* @api private
*/
function mime(req) {
var str = req.headers['content-type'] || '';
return str.split(';')[0];
}
/**
* Parse request bodies.
*
* By default _application/json_ and _application/x-www-form-urlencoded_
* are supported, however you may map `connect.bodyParser.parse[contentType]`
* to a function of your choice to replace existing parsers, or implement
* one for other content-types.
*
* Examples:
*
* connect.createServer(
* connect.bodyParser()
* , function(req, res) {
* res.end('viewing user ' + req.body.user.name);
* }
* );
*
* Since both _json_ and _x-www-form-urlencoded_ are supported by
* default, either of the following requests would result in the response
* of "viewing user tj".
*
* $ curl -d 'user[name]=tj' http://localhost/
* $ curl -d '{"user":{"name":"tj"}}' -H "Content-Type: application/json" http://localhost/
*
* @return {Function}
* @api public
*/
exports = module.exports = function bodyParser(){
return function bodyParser(req, res, next) {
if (req.body) return next();
req.body = {};
if ('GET' == req.method || 'HEAD' == req.method) return next();
var parser = exports.parse[mime(req)];
if (parser) {
var data = '';
req.setEncoding('utf8');
req.on('data', function(chunk) { data += chunk; });
req.on('end', function(){
try {
req.body = data
? parser(data)
: {};
} catch (err) {
return next(err);
}
next();
});
} else {
next();
}
}
};
/**
* Supported decoders.
*
* - application/x-www-form-urlencoded
* - application/json
*/
exports.parse = {
'application/x-www-form-urlencoded': qs.parse
, 'application/json': JSON.parse
};