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var db = require('mime-db')
// types[extension] = type
exports.types = Object.create(null)
// extensions[type] = [extensions]
exports.extensions = Object.create(null)
Object.keys(db).forEach(function (name) {
var mime = db[name]
var exts = mime.extensions
if (!exts || !exts.length) return
exports.extensions[name] = exts
exts.forEach(function (ext) {
exports.types[ext] = name
})
})
exports.lookup = function (string) {
if (!string || typeof string !== "string") return false
// remove any leading paths, though we should just use path.basename
string = string.replace(/.*[\.\/\\]/, '').toLowerCase()
if (!string) return false
return exports.types[string] || false
}
exports.extension = function (type) {
if (!type || typeof type !== "string") return false
// to do: use media-typer
type = type.match(/^\s*([^;\s]*)(?:;|\s|$)/)
if (!type) return false
var exts = exports.extensions[type[1].toLowerCase()]
if (!exts || !exts.length) return false
return exts[0]
}
// type has to be an exact mime type
exports.charset = function (type) {
var mime = db[type]
if (mime && mime.charset) return mime.charset
// default text/* to utf-8
if (/^text\//.test(type)) return 'UTF-8'
return false
}
// backwards compatibility
exports.charsets = {
lookup: exports.charset
}
// to do: maybe use set-type module or something
exports.contentType = function (type) {
if (!type || typeof type !== "string") return false
if (!~type.indexOf('/')) type = exports.lookup(type)
if (!type) return false
if (!~type.indexOf('charset')) {
var charset = exports.charset(type)
if (charset) type += '; charset=' + charset.toLowerCase()
}
return type
}
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