aaac7fed
 liuqimichale
add
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/*!
* compressible
* Copyright(c) 2013 Jonathan Ong
* Copyright(c) 2014 Jeremiah Senkpiel
* Copyright(c) 2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
* @private
*/
var db = require('mime-db')
/**
* Module variables.
* @private
*/
var COMPRESSIBLE_TYPE_REGEXP = /^text\/|\+(?:json|text|xml)$/i
var EXTRACT_TYPE_REGEXP = /^\s*([^;\s]*)(?:;|\s|$)/
/**
* Module exports.
* @public
*/
module.exports = compressible
/**
* Checks if a type is compressible.
*
* @param {string} type
* @return {Boolean} compressible
* @public
*/
function compressible (type) {
if (!type || typeof type !== 'string') {
return false
}
// strip parameters
var match = EXTRACT_TYPE_REGEXP.exec(type)
var mime = match && match[1].toLowerCase()
var data = db[mime]
// return database information
if (data && data.compressible !== undefined) {
return data.compressible
}
// fallback to regexp or unknown
return COMPRESSIBLE_TYPE_REGEXP.test(mime) || undefined
}
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