hackcentercontrol/nodeartnet/node_modules/express/node_modules/connect/lib/middleware/json.js

82 lines
1.7 KiB
JavaScript

/*!
* Connect - json
* Copyright(c) 2010 Sencha Inc.
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Module dependencies.
*/
var utils = require('../utils')
, _limit = require('./limit');
/**
* noop middleware.
*/
function noop(req, res, next) {
next();
}
/**
* JSON:
*
* Parse JSON request bodies, providing the
* parsed object as `req.body`.
*
* Options:
*
* - `strict` when `false` anything `JSON.parse()` accepts will be parsed
* - `reviver` used as the second "reviver" argument for JSON.parse
* - `limit` byte limit disabled by default
*
* @param {Object} options
* @return {Function}
* @api public
*/
exports = module.exports = function(options){
var options = options || {}
, strict = options.strict !== false;
var limit = options.limit
? _limit(options.limit)
: noop;
return function json(req, res, next) {
if (req._body) return next();
req.body = req.body || {};
if (!utils.hasBody(req)) return next();
// check Content-Type
if ('application/json' != utils.mime(req)) return next();
// flag as parsed
req._body = true;
// parse
limit(req, res, function(err){
if (err) return next(err);
var buf = '';
req.setEncoding('utf8');
req.on('data', function(chunk){ buf += chunk });
req.on('end', function(){
var first = buf.trim()[0];
if (strict && '{' != first && '[' != first) return next(utils.error(400, 'invalid json'));
try {
req.body = JSON.parse(buf, options.reviver);
next();
} catch (err){
err.body = buf;
err.status = 400;
next(err);
}
});
});
}
};