59 lines
1.0 KiB
JavaScript
59 lines
1.0 KiB
JavaScript
/*!
|
|
* 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
|
|
}
|