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/*!
* Connect - limit
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Limit request bodies to the given size in `bytes`.
*
* A string representation of the bytesize may also be passed,
* for example "5mb", "200kb", "1gb", etc.
*
* Examples:
*
* var server = connect(
* connect.limit('5.5mb')
* ).listen(3000);
*
* TODO: pause EV_READ
*
* @param {Number|String} bytes
* @return {Function}
* @api public
*/
module.exports = function limit(bytes){
if ('string' == typeof bytes) bytes = parse(bytes);
if ('number' != typeof bytes) throw new Error('limit() bytes required');
return function limit(req, res, next){
var received = 0
, len = req.headers['content-length']
? parseInt(req.headers['content-length'], 10)
: null;
// deny the request
function deny() {
req.destroy();
}
// self-awareness
if (req._limit) return next();
req._limit = true;
// limit by content-length
if (len && len > bytes) {
res.statusCode = 413;
res.end('Request Entity Too Large');
return;
}
// limit
req.on('data', function(chunk){
received += chunk.length;
if (received > bytes) deny();
});
next();
};
};
/**
* Parse byte `size` string.
*
* @param {String} size
* @return {Number}
* @api private
*/
function parse(size) {
var parts = size.match(/^(\d+(?:\.\d+)?) *(kb|mb|gb)$/)
, n = parseFloat(parts[1])
, type = parts[2];
var map = {
kb: 1024
, mb: 1024 * 1024
, gb: 1024 * 1024 * 1024
};
return map[type] * n;
}