mirror of
https://github.com/zebrajr/express.git
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384 lines
8.1 KiB
JavaScript
384 lines
8.1 KiB
JavaScript
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/*!
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* Express - request
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* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
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* MIT Licensed
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*/
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/**
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* Module dependencies.
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*/
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var http = require('http')
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, utils = require('./utils')
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, connect = require('connect')
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, parse = require('url').parse
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, mime = require('mime');
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/**
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* Request prototype.
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*/
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var req = exports = module.exports = {
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__proto__: http.IncomingMessage.prototype
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};
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/**
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* Return request header or optional default.
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*
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* The `Referrer` header field is special-cased,
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* both `Referrer` and `Referer` will yield are
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* interchangeable.
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*
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* Examples:
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*
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* req.header('Content-Type');
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* // => "text/plain"
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*
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* req.header('content-type');
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* // => "text/plain"
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*
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* req.header('Accept');
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* // => undefined
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*
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* req.header('Accept', 'text/html');
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* // => "text/html"
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*
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* @param {String} name
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* @param {String} defaultValue
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* @return {String}
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* @api public
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*/
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req.header = function(name, defaultValue){
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switch (name = name.toLowerCase()) {
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case 'referer':
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case 'referrer':
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return this.headers.referrer
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|| this.headers.referer
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|| defaultValue;
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default:
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return this.headers[name] || defaultValue;
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}
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};
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/**
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* Get `field`'s `param` value, defaulting to ''.
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*
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* Examples:
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*
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* req.get('content-disposition', 'filename');
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* // => "something.png"
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*
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* req.get('content-disposition', 'rawr');
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* // => ""
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*
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* @param {String} field
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* @param {String} param
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* @return {String}
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* @api public
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*/
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req.get = function(field, param){
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// TODO: rename... add tests, make .get() .header()
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var val = this.header(field);
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if (!val) return '';
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var regexp = new RegExp(param + ' *= *(?:"([^"]+)"|([^;]+))', 'i');
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if (!regexp.exec(val)) return '';
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return RegExp.$1 || RegExp.$2;
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};
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/**
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* Check if the given `type` is acceptable,
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* otherwise you should respond with 406 "Not Acceptable".
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*
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* Examples:
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*
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* // Accept: text/html
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* req.accepts('html');
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* // => true
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*
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* // Accept: text/*; application/json
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* req.accepts('html');
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* req.accepts('text/html');
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* req.accepts('text/plain');
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* req.accepts('application/json');
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* // => true
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*
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* req.accepts('image/png');
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* req.accepts('png');
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* // => false
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*
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* @param {String} type
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* @return {Boolean}
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* @api public
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*/
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req.accepts = function(type){
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return utils.accepts(type, this.header('Accept'));
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};
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/**
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* Check if the given `charset` is acceptable,
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* otherwise you should respond with 406 "Not Acceptable".
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*
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* @param {String} charset
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* @return {Boolean}
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* @api public
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*/
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req.acceptsCharset = function(charset){
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var accepted = this.acceptedCharsets;
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return accepted.length
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? ~accepted.indexOf(charset)
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: true;
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};
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/**
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* Check if the given `lang` is acceptable,
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* otherwise you should respond with 406 "Not Acceptable".
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*
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* @param {String} lang
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* @return {Boolean}
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* @api public
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*/
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req.acceptsLanguage = function(lang){
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var accepted = this.acceptedLanguages;
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return accepted.length
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? ~accepted.indexOf(lang)
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: true;
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};
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/**
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* Return an array of Accepted media types
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* ordered from highest quality to lowest.
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*
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* Examples:
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*
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* [ { value: 'application/json',
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* quality: 1,
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* type: 'application',
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* subtype: 'json' },
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* { value: 'text/html',
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* quality: 0.5,
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* type: 'text',
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* subtype: 'html' } ]
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*
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* @return {Array}
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* @api public
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*/
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req.__defineGetter__('accepted', function(){
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var accept = this.header('Accept');
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return accept
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? utils.parseAccept(accept)
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: [];
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});
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/**
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* Return an array of Accepted languages
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* ordered from highest quality to lowest.
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*
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* Examples:
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*
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* Accept-Language: en;q=.5, en-us
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* ['en-us', 'en']
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*
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* @return {Array}
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* @api public
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*/
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req.__defineGetter__('acceptedLanguages', function(){
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var accept = this.header('Accept-Language');
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return accept
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? utils
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.parseQuality(accept)
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.map(function(obj){
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return obj.value;
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})
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: [];
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});
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/**
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* Return an array of Accepted charsets
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* ordered from highest quality to lowest.
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*
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* Examples:
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*
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* Accept-Charset: iso-8859-5;q=.2, unicode-1-1;q=0.8
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* ['unicode-1-1', 'iso-8859-5']
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*
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* @return {Array}
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* @api public
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*/
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req.__defineGetter__('acceptedCharsets', function(){
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var accept = this.header('Accept-Charset');
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return accept
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? utils
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.parseQuality(accept)
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.map(function(obj){
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return obj.value;
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})
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: [];
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});
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/**
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* Return the value of param `name` when present or `defaultValue`.
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*
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* - Checks body params, ex: id=12, {"id":12}
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* - Checks route placeholders, ex: _/user/:id_
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* - Checks query string params, ex: ?id=12
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*
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* To utilize request bodies, `req.body`
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* should be an object. This can be done by using
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* the `connect.bodyParser()` middleware.
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*
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* @param {String} name
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* @param {Mixed} defaultValue
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* @return {String}
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* @api public
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*/
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req.param = function(name, defaultValue){
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// req.body
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if (this.body && undefined !== this.body[name]) return this.body[name];
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// route params
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if (this.params
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&& this.params.hasOwnProperty(name)
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&& undefined !== this.params[name]) {
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return this.params[name];
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}
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// query-string
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if (undefined !== this.query[name]) return this.query[name];
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return defaultValue;
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};
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/**
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* Check if the incoming request contains the "Content-Type"
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* header field, and it contains the give mime `type`.
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*
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* Examples:
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*
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* // With Content-Type: text/html; charset=utf-8
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* req.is('html');
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* req.is('text/html');
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* // => true
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*
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* // When Content-Type is application/json
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* req.is('json');
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* req.is('application/json');
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* // => true
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*
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* req.is('html');
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* // => false
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*
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* Ad-hoc callbacks can also be registered with Express, to perform
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* assertions again the request, for example if we need an expressive
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* way to check if our incoming request is an image, we can register "an image"
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* callback:
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*
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* app.is('an image', function(req){
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* return 0 == req.headers['content-type'].indexOf('image');
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* });
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*
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* app.is('an attachment', function(req){
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* return 0 == req.headers['content-disposition'].indexOf('attachment');
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* });
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*
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* Now within our route callbacks, we can use to to assert content types
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* such as "image/jpeg", "image/png", etc.
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*
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* app.post('/image/upload', function(req, res, next){
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* if (req.is('an image')) {
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* // do something
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* } else {
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* next();
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* }
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* });
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*
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* @param {String} type
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* @return {Boolean}
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* @api public
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*/
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req.is = function(type){
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var fn = this.app.is(type);
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if (fn) return fn(this);
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var ct = this.headers['content-type'];
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if (!ct) return false;
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ct = ct.split(';')[0];
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if (!~type.indexOf('/')) type = mime.lookup(type);
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if (~type.indexOf('*')) {
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type = type.split('/');
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ct = ct.split('/');
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if ('*' == type[0] && type[1] == ct[1]) return true;
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if ('*' == type[1] && type[0] == ct[0]) return true;
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return false;
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}
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return !! ~ct.indexOf(type);
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};
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/**
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* Short-hand for `req.connection.encrypted`.
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*
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* @return {Boolean}
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* @api public
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*/
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req.__defineGetter__('secure', function(){
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return this.connection.encrypted;
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});
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/**
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* Short-hand for `require('url').parse(req.url).pathname`.
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*
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* @return {String}
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* @api public
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*/
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req.__defineGetter__('path', function(){
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return parse(this.url).pathname;
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});
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/**
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* Check if the request is fresh, aka
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* Last-Modified and/or the ETag
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* still match.
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*
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* @return {Boolean}
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* @api public
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*/
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req.__defineGetter__('fresh', function(){
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return ! this.stale;
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});
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/**
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* Check if the request is stale, aka
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* Last-Modified and/or the ETag for the
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* resource has changed.
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*
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* @return {Boolean}
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* @api public
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*/
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req.__defineGetter__('stale', function(){
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return connect.utils.modified(this, this.res);
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});
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/**
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* Check if the request was an _XMLHttpRequest_.
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*
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* @return {Boolean}
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* @api public
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*/
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req.__defineGetter__('xhr', function(){
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return 'xmlhttprequest' == this.header('X-Requested-With', '').toLowerCase();
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});
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