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/*!
* Express - request
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var http = require('http')
, req = http.IncomingMessage.prototype
, utils = require('./utils')
, parse = require('url').parse
, mime = require('mime');
/**
* Default flash formatters.
*
* @type Object
*/
var flashFormatters = exports.flashFormatters = {
s: function(val){
return String(val);
}
};
/**
* Return request header or optional default.
*
* The `Referrer` header field is special-cased,
* both `Referrer` and `Referer` will yield are
* interchangeable.
*
* Examples:
*
* req.header('Content-Type');
* // => "text/plain"
*
* req.header('content-type');
* // => "text/plain"
*
* req.header('Accept');
* // => undefined
*
* req.header('Accept', 'text/html');
* // => "text/html"
*
* @param {String} name
* @param {String} defaultValue
* @return {String}
* @api public
*/
req.header = function(name, defaultValue){
switch (name = name.toLowerCase()) {
case 'referer':
case 'referrer':
return this.headers.referrer
|| this.headers.referer
|| defaultValue;
default:
return this.headers[name] || defaultValue;
}
};
/**
* Get `field`'s `param` value, defaulting to ''.
*
* Examples:
*
* req.get('content-disposition', 'filename');
* // => "something.png"
*
* @param {String} field
* @param {String} param
* @return {String}
* @api public
*/
req.get = function(field, param){
var val = this.header(field);
if (!val) return '';
var regexp = new RegExp(param + ' *= *(?:"([^"]+)"|([^;]+))', 'i');
if (!regexp.exec(val)) return '';
return RegExp.$1 || RegExp.$2;
};
/**
* Short-hand for `require('url').parse(req.url).pathname`.
*
* @return {String}
* @api public
*/
req.__defineGetter__('path', function(){
return parse(this.url).pathname;
});
/**
* Check if the _Accept_ header is present, and includes the given `type`.
*
* When the _Accept_ header is not present `true` is returned. Otherwise
* the given `type` is matched by an exact match, and then subtypes. You
* may pass the subtype such as "html" which is then converted internally
* to "text/html" using the mime lookup table.
*
* Examples:
*
* // Accept: text/html
* req.accepts('html');
* // => true
*
* // Accept: text/*; application/json
* req.accepts('html');
* req.accepts('text/html');
* req.accepts('text/plain');
* req.accepts('application/json');
* // => true
*
* req.accepts('image/png');
* req.accepts('png');
* // => false
*
* @param {String} type
* @return {Boolean}
* @api public
*/
req.accepts = function(type){
var accept = this.header('Accept');
// normalize extensions ".json" -> "json"
if (type && '.' == type[0]) type = type.substr(1);
// when Accept does not exist, or contains '*/*' return true
if (!accept || ~accept.indexOf('*/*')) {
return true;
} else if (type) {
// allow "html" vs "text/html" etc
if (!~type.indexOf('/')) type = mime.lookup(type);
// check if we have a direct match
if (~accept.indexOf(type)) return true;
// check if we have type/*
type = type.split('/')[0] + '/*';
return !!~accept.indexOf(type);
} else {
return false;
}
};
/**
* Return the value of param `name` when present or `defaultValue`.
*
* - Checks route placeholders, ex: _/user/:id_
* - Checks query string params, ex: ?id=12
* - Checks urlencoded body params, ex: id=12
*
* To utilize urlencoded request bodies, `req.body`
* should be an object. This can be done by using
* the `connect.bodyParser` middleware.
*
* @param {String} name
* @param {Mixed} defaultValue
* @return {String}
* @api public
*/
req.param = function(name, defaultValue){
// route params like /user/:id
if (this.params && this.params.hasOwnProperty(name) && undefined !== this.params[name]) {
return this.params[name];
}
// query string params
if (undefined !== this.query[name]) {
return this.query[name];
}
// request body params via connect.bodyParser
if (this.body && undefined !== this.body[name]) {
return this.body[name];
}
return defaultValue;
};
/**
* Queue flash `msg` of the given `type`.
*
* Examples:
*
* req.flash('info', 'email sent');
* req.flash('error', 'email delivery failed');
* req.flash('info', 'email re-sent');
* // => 2
*
* req.flash('info');
* // => ['email sent', 'email re-sent']
*
* req.flash('info');
* // => []
*
* req.flash();
* // => { error: ['email delivery failed'], info: [] }
*
* Formatting:
*
* Flash notifications also support arbitrary formatting support.
* For example you may pass variable arguments to `req.flash()`
* and use the %s specifier to be replaced by the associated argument:
*
* req.flash('info', 'email has been sent to %s.', userName);
*
* To add custom formatters use the `exports.flashFormatters` object.
*
* @param {String} type
* @param {String} msg
* @return {Array|Object|Number}
* @api public
*/
req.flash = function(type, msg){
if (this.session === undefined) throw Error('req.flash() requires sessions');
var msgs = this.session.flash = this.session.flash || {};
if (type && msg) {
var i = 2
, args = arguments
, formatters = this.app.flashFormatters || {};
formatters.__proto__ = flashFormatters;
msg = utils.miniMarkdown(msg);
msg = msg.replace(/%([a-zA-Z])/g, function(_, format){
var formatter = formatters[format];
if (formatter) return formatter(utils.escape(args[i++]));
});
return (msgs[type] = msgs[type] || []).push(msg);
} else if (type) {
var arr = msgs[type];
delete msgs[type];
return arr || [];
} else {
this.session.flash = {};
return msgs;
}
};
/**
* Check if the incoming request contains the "Content-Type"
* header field, and it contains the give mime `type`.
*
* Examples:
*
* // With Content-Type: text/html; charset=utf-8
* req.is('html');
* req.is('text/html');
* // => true
*
* // When Content-Type is application/json
* req.is('json');
* req.is('application/json');
* // => true
*
* req.is('html');
* // => false
*
* Ad-hoc callbacks can also be registered with Express, to perform
* assertions again the request, for example if we need an expressive
* way to check if our incoming request is an image, we can register "an image"
* callback:
*
* app.is('an image', function(req){
* return 0 == req.headers['content-type'].indexOf('image');
* });
*
* Now within our route callbacks, we can use to to assert content types
* such as "image/jpeg", "image/png", etc.
*
* app.post('/image/upload', function(req, res, next){
* if (req.is('an image')) {
* // do something
* } else {
* next();
* }
* });
*
* @param {String} type
* @return {Boolean}
* @api public
*/
req.is = function(type){
var fn = this.app.is(type);
if (fn) return fn(this);
var ct = this.headers['content-type'];
if (!ct) return false;
ct = ct.split(';')[0];
if (!~type.indexOf('/')) type = mime.lookup(type);
if (~type.indexOf('*')) {
type = type.split('/');
ct = ct.split('/');
if ('*' == type[0] && type[1] == ct[1]) return true;
if ('*' == type[1] && type[0] == ct[0]) return true;
return false;
}
return !! ~ct.indexOf(type);
};
// Callback for isXMLHttpRequest / xhr
function isxhr() {
return this.header('X-Requested-With', '').toLowerCase() === 'xmlhttprequest';
}
/**
* Check if the request was an _XMLHttpRequest_.
*
* @return {Boolean}
* @api public
*/
req.__defineGetter__('isXMLHttpRequest', isxhr);
req.__defineGetter__('xhr', isxhr);