mirror of
https://github.com/Hopiu/postal.js.git
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346 lines
7.8 KiB
JavaScript
346 lines
7.8 KiB
JavaScript
/*!
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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 ) {
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return '';
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}
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var regexp = new RegExp( param + ' *= *(?:"([^"]+)"|([^;]+))', 'i' );
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if ( !regexp.exec( val ) ) {
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return '';
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}
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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] ) {
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type = type.substr( 1 );
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}
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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( '/' ) ) {
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type = mime.lookup( type );
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}
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// check if we have a direct match
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if ( ~accept.indexOf( type ) ) {
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return true;
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}
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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 ) {
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throw Error( 'req.flash() requires sessions' );
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}
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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 ) {
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return formatter( utils.escape( args[i++] ) );
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}
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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 ) {
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return fn( this );
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}
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var ct = this.headers['content-type'];
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if ( !ct ) {
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return false;
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}
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ct = ct.split( ';' )[0];
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if ( !~type.indexOf( '/' ) ) {
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type = mime.lookup( type );
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}
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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] ) {
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return true;
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}
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if ( '*' == type[1] && type[0] == ct[0] ) {
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return true;
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}
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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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