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var Negotiator = require('negotiator')
var mime = require('mime-types')
var slice = [].slice
module.exports = Accepts
function Accepts(req) {
if (!(this instanceof Accepts))
return new Accepts(req)
this.headers = req.headers
this.negotiator = 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} type(s)...
* @return {String|Array|Boolean}
* @api public
*/
Accepts.prototype.type =
Accepts.prototype.types = function (types) {
if (!Array.isArray(types)) types = slice.call(arguments);
var n = this.negotiator;
if (!types.length) return n.mediaTypes();
if (!this.headers.accept) return types[0];
var mimes = types.map(extToMime);
var accepts = n.mediaTypes(mimes.filter(validMime));
var first = accepts[0];
if (!first) return false;
return types[mimes.indexOf(first)];
}
/**
* 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} encoding(s)...
* @return {String|Array}
* @api public
*/
Accepts.prototype.encoding =
Accepts.prototype.encodings = function (encodings) {
if (!Array.isArray(encodings)) encodings = slice.call(arguments);
var n = this.negotiator;
if (!encodings.length) return n.encodings();
return n.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} charset(s)...
* @return {String|Array}
* @api public
*/
Accepts.prototype.charset =
Accepts.prototype.charsets = function (charsets) {
if (!Array.isArray(charsets)) charsets = [].slice.call(arguments);
var n = this.negotiator;
if (!charsets.length) return n.charsets();
if (!this.headers['accept-charset']) return charsets[0];
return n.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} lang(s)...
* @return {Array|String}
* @api public
*/
Accepts.prototype.lang =
Accepts.prototype.langs =
Accepts.prototype.language =
Accepts.prototype.languages = function (langs) {
if (!Array.isArray(langs)) langs = slice.call(arguments);
var n = this.negotiator;
if (!langs.length) return n.languages();
if (!this.headers['accept-language']) return langs[0];
return n.languages(langs)[0] || false;
}
/**
* Convert extnames to mime.
*
* @param {String} type
* @return {String}
* @api private
*/
function extToMime(type) {
if (~type.indexOf('/')) return type;
return mime.lookup(type);
}
/**
* Check if mime is valid.
*
* @param {String} type
* @return {String}
* @api private
*/
function validMime(type) {
return typeof type === 'string';
}
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