324 lines
7.8 KiB
JavaScript
324 lines
7.8 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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, req = http.IncomingMessage.prototype
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, utils = require('./utils')
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, parse = require('url').parse
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, mime = require('mime');
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/**
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* Default flash formatters.
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*
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* @type Object
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*/
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var flashFormatters = exports.flashFormatters = {
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s: function(val){
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return String(val);
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}
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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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* @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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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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* 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 _Accept_ header is present, and includes the given `type`.
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*
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* When the _Accept_ header is not present `true` is returned. Otherwise
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* the given `type` is matched by an exact match, and then subtypes. You
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* may pass the subtype such as "html" which is then converted internally
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* to "text/html" using the mime lookup table.
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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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var accept = this.header('Accept');
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// normalize extensions ".json" -> "json"
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if (type && '.' == type[0]) type = type.substr(1);
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// when Accept does not exist, or is '*/*' return true
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if (!accept || '*/*' == accept) {
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return true;
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} else if (type) {
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// allow "html" vs "text/html" etc
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if (!~type.indexOf('/')) type = mime.lookup(type);
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// check if we have a direct match
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if (~accept.indexOf(type)) return true;
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// check if we have type/*
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type = type.split('/')[0] + '/*';
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return !!~accept.indexOf(type);
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} else {
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return false;
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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 route placeholders, ex: _/user/:id_
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* - Checks query string params, ex: ?id=12
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* - Checks urlencoded body params, ex: id=12
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*
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* To utilize urlencoded 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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// route params like /user/:id
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if (this.params && this.params.hasOwnProperty(name) && undefined !== this.params[name]) {
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return this.params[name];
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}
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// query string params
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if (undefined !== this.query[name]) {
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return this.query[name];
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}
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// request body params via connect.bodyParser
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if (this.body && undefined !== this.body[name]) {
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return this.body[name];
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}
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return defaultValue;
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};
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/**
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* Queue flash `msg` of the given `type`.
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*
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* Examples:
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*
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* req.flash('info', 'email sent');
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* req.flash('error', 'email delivery failed');
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* req.flash('info', 'email re-sent');
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* // => 2
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*
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* req.flash('info');
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* // => ['email sent', 'email re-sent']
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*
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* req.flash('info');
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* // => []
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*
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* req.flash();
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* // => { error: ['email delivery failed'], info: [] }
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*
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* Formatting:
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*
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* Flash notifications also support arbitrary formatting support.
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* For example you may pass variable arguments to `req.flash()`
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* and use the %s specifier to be replaced by the associated argument:
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*
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* req.flash('info', 'email has been sent to %s.', userName);
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*
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* To add custom formatters use the `exports.flashFormatters` object.
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*
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* @param {String} type
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* @param {String} msg
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* @return {Array|Object|Number}
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* @api public
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*/
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req.flash = function(type, msg){
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if (this.session === undefined) throw Error('req.flash() requires sessions');
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var msgs = this.session.flash = this.session.flash || {};
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if (type && msg) {
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var i = 2
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, args = arguments
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, formatters = this.app.flashFormatters || {};
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formatters.__proto__ = flashFormatters;
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msg = utils.miniMarkdown(msg);
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msg = msg.replace(/%([a-zA-Z])/g, function(_, format){
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var formatter = formatters[format];
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if (formatter) return formatter(utils.escape(args[i++]));
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});
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return (msgs[type] = msgs[type] || []).push(msg);
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} else if (type) {
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var arr = msgs[type];
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delete msgs[type];
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return arr || [];
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} else {
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this.session.flash = {};
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return msgs;
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}
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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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* 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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// Callback for isXMLHttpRequest / xhr
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function isxhr() {
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return this.header('X-Requested-With', '').toLowerCase() === 'xmlhttprequest';
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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__('isXMLHttpRequest', isxhr);
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req.__defineGetter__('xhr', isxhr);
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