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/*!

* accepts

* Copyright(c) 2014 Jonathan Ong

* Copyright(c) 2015 Douglas Christopher Wilson

* MIT Licensed

*/

'use strict'

/**

* Module dependencies.

* @private

*/

var Negotiator = require('negotiator')

var mime = require('mime-types')

/**

* Module exports.

* @public

*/

module.exports = Accepts

/**

* Create a new Accepts object for the given req.

*

* @param {object} req

* @public

*/

function Accepts (req) {

if (!(this instanceof Accepts)) {

return new Accepts(req)

}

this.headers = req.headers

this.negotiator = new Negotiator(req)

}

/**

* Check if the given `type(s)` is acceptable, returning

* the best match when true, otherwise `undefined`, in which

* case you should respond with 406 "Not Acceptable".

*

* The `type` value may be a single mime type string

* such as "application/json", the extension name

* such as "json" or an array `["json", "html", "text/plain"]`. When a list

* or array is given the _best_ match, if any is returned.

*

* Examples:

*

* // Accept: text/html

* this.types('html');

* // => "html"

*

* // Accept: text/*, application/json

* this.types('html');

* // => "html"

* this.types('text/html');

* // => "text/html"

* this.types('json', 'text');

* // => "json"

* this.types('application/json');

* // => "application/json"

*

* // Accept: text/*, application/json

* this.types('image/png');

* this.types('png');

* // => undefined

*

* // Accept: text/*;q=.5, application/json

* this.types(['html', 'json']);

* this.types('html', 'json');

* // => "json"

*

* @param {String|Array} types...

* @return {String|Array|Boolean}

* @public

*/

Accepts.prototype.type =

Accepts.prototype.types = function (types_) {

var types = types_

// support flattened arguments

if (types && !Array.isArray(types)) {

types = new Array(arguments.length)

for (var i = 0; i < types.length; i++) {

types[i] = arguments[i]

}

}

// no types, return all requested types

if (!types || types.length === 0) {

return this.negotiator.mediaTypes()

}

// no accept header, return first given type

if (!this.headers.accept) {

return types[0]

}

var mimes = types.map(extToMime)

var accepts = this.negotiator.mediaTypes(mimes.filter(validMime))

var first = accepts[0]

return first

? types[mimes.indexOf(first)]

: false

}

/**

* Return accepted encodings or best fit based on `encodings`.

*

* Given `Accept-Encoding: gzip, deflate`

* an array sorted by quality is returned:

*

* ['gzip', 'deflate']

*

* @param {String|Array} encodings...

* @return {String|Array}

* @public

*/

Accepts.prototype.encoding =

Accepts.prototype.encodings = function (encodings_) {

var encodings = encodings_

// support flattened arguments

if (encodings && !Array.isArray(encodings)) {

encodings = new Array(arguments.length)

for (var i = 0; i < encodings.length; i++) {

encodings[i] = arguments[i]

}

}

// no encodings, return all requested encodings

if (!encodings || encodings.length === 0) {

return this.negotiator.encodings()

}

return this.negotiator.encodings(encodings)[0] || false

}

/**

* Return accepted charsets or best fit based on `charsets`.

*

* Given `Accept-Charset: utf-8, iso-8859-1;q=0.2, utf-7;q=0.5`

* an array sorted by quality is returned:

*

* ['utf-8', 'utf-7', 'iso-8859-1']

*

* @param {String|Array} charsets...

* @return {String|Array}

* @public

*/

Accepts.prototype.charset =

Accepts.prototype.charsets = function (charsets_) {

var charsets = charsets_

// support flattened arguments

if (charsets && !Array.isArray(charsets)) {

charsets = new Array(arguments.length)

for (var i = 0; i < charsets.length; i++) {

charsets[i] = arguments[i]

}

}

// no charsets, return all requested charsets

if (!charsets || charsets.length === 0) {

return this.negotiator.charsets()

}

return this.negotiator.charsets(charsets)[0] || false

}

/**

* Return accepted languages or best fit based on `langs`.

*

* Given `Accept-Language: en;q=0.8, es, pt`

* an array sorted by quality is returned:

*

* ['es', 'pt', 'en']

*

* @param {String|Array} langs...

* @return {Array|String}

* @public

*/

Accepts.prototype.lang =

Accepts.prototype.langs =

Accepts.prototype.language =

Accepts.prototype.languages = function (languages_) {

var languages = languages_

// support flattened arguments

if (languages && !Array.isArray(languages)) {

languages = new Array(arguments.length)

for (var i = 0; i < languages.length; i++) {

languages[i] = arguments[i]

}

}

// no languages, return all requested languages

if (!languages || languages.length === 0) {

return this.negotiator.languages()

}

return this.negotiator.languages(languages)[0] || false

}

/**

* Convert extnames to mime.

*

* @param {String} type

* @return {String}

* @private

*/

function extToMime (type) {

return type.indexOf('/') === -1

? mime.lookup(type)

: type

}

/**

* Check if mime is valid.

*

* @param {String} type

* @return {String}

* @private

*/

function validMime (type) {

return typeof type === 'string'

}