You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
3.3 KiB
124 lines
3.3 KiB
/*!
|
|
* negotiator
|
|
* Copyright(c) 2012 Federico Romero
|
|
* Copyright(c) 2012-2014 Isaac Z. Schlueter
|
|
* Copyright(c) 2015 Douglas Christopher Wilson
|
|
* MIT Licensed
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
/**
|
|
* Cached loaded submodules.
|
|
* @private
|
|
*/
|
|
|
|
var modules = Object.create(null);
|
|
|
|
/**
|
|
* Module exports.
|
|
* @public
|
|
*/
|
|
|
|
module.exports = Negotiator;
|
|
module.exports.Negotiator = Negotiator;
|
|
|
|
/**
|
|
* Create a Negotiator instance from a request.
|
|
* @param {object} request
|
|
* @public
|
|
*/
|
|
|
|
function Negotiator(request) {
|
|
if (!(this instanceof Negotiator)) {
|
|
return new Negotiator(request);
|
|
}
|
|
|
|
this.request = request;
|
|
}
|
|
|
|
Negotiator.prototype.charset = function charset(available) {
|
|
var set = this.charsets(available);
|
|
return set && set[0];
|
|
};
|
|
|
|
Negotiator.prototype.charsets = function charsets(available) {
|
|
var preferredCharsets = loadModule('charset').preferredCharsets;
|
|
return preferredCharsets(this.request.headers['accept-charset'], available);
|
|
};
|
|
|
|
Negotiator.prototype.encoding = function encoding(available) {
|
|
var set = this.encodings(available);
|
|
return set && set[0];
|
|
};
|
|
|
|
Negotiator.prototype.encodings = function encodings(available) {
|
|
var preferredEncodings = loadModule('encoding').preferredEncodings;
|
|
return preferredEncodings(this.request.headers['accept-encoding'], available);
|
|
};
|
|
|
|
Negotiator.prototype.language = function language(available) {
|
|
var set = this.languages(available);
|
|
return set && set[0];
|
|
};
|
|
|
|
Negotiator.prototype.languages = function languages(available) {
|
|
var preferredLanguages = loadModule('language').preferredLanguages;
|
|
return preferredLanguages(this.request.headers['accept-language'], available);
|
|
};
|
|
|
|
Negotiator.prototype.mediaType = function mediaType(available) {
|
|
var set = this.mediaTypes(available);
|
|
return set && set[0];
|
|
};
|
|
|
|
Negotiator.prototype.mediaTypes = function mediaTypes(available) {
|
|
var preferredMediaTypes = loadModule('mediaType').preferredMediaTypes;
|
|
return preferredMediaTypes(this.request.headers.accept, available);
|
|
};
|
|
|
|
// Backwards compatibility
|
|
Negotiator.prototype.preferredCharset = Negotiator.prototype.charset;
|
|
Negotiator.prototype.preferredCharsets = Negotiator.prototype.charsets;
|
|
Negotiator.prototype.preferredEncoding = Negotiator.prototype.encoding;
|
|
Negotiator.prototype.preferredEncodings = Negotiator.prototype.encodings;
|
|
Negotiator.prototype.preferredLanguage = Negotiator.prototype.language;
|
|
Negotiator.prototype.preferredLanguages = Negotiator.prototype.languages;
|
|
Negotiator.prototype.preferredMediaType = Negotiator.prototype.mediaType;
|
|
Negotiator.prototype.preferredMediaTypes = Negotiator.prototype.mediaTypes;
|
|
|
|
/**
|
|
* Load the given module.
|
|
* @private
|
|
*/
|
|
|
|
function loadModule(moduleName) {
|
|
var module = modules[moduleName];
|
|
|
|
if (module !== undefined) {
|
|
return module;
|
|
}
|
|
|
|
// This uses a switch for static require analysis
|
|
switch (moduleName) {
|
|
case 'charset':
|
|
module = require('./lib/charset');
|
|
break;
|
|
case 'encoding':
|
|
module = require('./lib/encoding');
|
|
break;
|
|
case 'language':
|
|
module = require('./lib/language');
|
|
break;
|
|
case 'mediaType':
|
|
module = require('./lib/mediaType');
|
|
break;
|
|
default:
|
|
throw new Error('Cannot find module \'' + moduleName + '\'');
|
|
}
|
|
|
|
// Store to prevent invoking require()
|
|
modules[moduleName] = module;
|
|
|
|
return module;
|
|
}
|
|
|