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/*!
* Connect
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Module dependencies.
*/
var cookie = require('cookie');
var deprecate = require('depd')('connect');
var http = require('http');
var merge = require('utils-merge');
var onHeaders = require('on-headers');
var utils = require('./utils')
, res = http.ServerResponse.prototype
, addListener = res.addListener
, setHeader = res.setHeader;
// apply only once
if (!res._hasConnectPatch) {
/**
* Provide a public "header sent" flag
* until node does.
*
* @return {Boolean}
* @api public
*/
Object.defineProperty(res, 'headerSent', {
configurable: true,
enumerable: true,
get: headersSent
});
deprecate.property(res, 'headerSent', 'res.headerSent: use standard res.headersSent');
if (!('headersSent' in res)) {
/**
* Provide the public "header sent" flag
* added in node.js 0.10.
*
* @return {Boolean}
* @api public
*/
Object.defineProperty(res, 'headersSent', {
configurable: true,
enumerable: true,
get: headersSent
});
}
/**
* Set cookie `name` to `val`, with the given `options`.
*
* Options:
*
* - `maxAge` max-age in milliseconds, converted to `expires`
* - `path` defaults to "/"
*
* @param {String} name
* @param {String} val
* @param {Object} options
* @api public
*/
res.cookie = function(name, val, options){
options = merge({}, options);
if ('maxAge' in options) {
options.expires = new Date(Date.now() + options.maxAge);
options.maxAge /= 1000;
}
if (null == options.path) options.path = '/';
this.setHeader('Set-Cookie', cookie.serialize(name, String(val), options));
};
/**
* Append additional header `field` with value `val`.
*
* @param {String} field
* @param {String} val
* @api public
*/
res.appendHeader = function appendHeader(field, val){
var prev = this.getHeader(field);
if (!prev) return setHeader.call(this, field, val);
// concat the new and prev vals
val = Array.isArray(prev) ? prev.concat(val)
: Array.isArray(val) ? [prev].concat(val)
: [prev, val];
return setHeader.call(this, field, val);
};
/**
* Set header `field` to `val`, special-casing
* the `Set-Cookie` field for multiple support.
*
* @param {String} field
* @param {String} val
* @api public
*/
res.setHeader = function(field, val){
var key = field.toLowerCase()
, prev;
// special-case Set-Cookie
if (key === 'set-cookie') {
// detect code doing getHeader -> setHeader
if (Array.isArray(val) && val.length > 1) {
prev = [].concat(this.getHeader(field) || []);
val = unique(prev, val);
}
return this.appendHeader(field, val);
}
// charset
if ('content-type' == key && this.charset) {
val = utils.setCharset(val, this.charset, true);
}
return setHeader.call(this, field, val);
};
/**
* Proxy to emit "header" event.
*/
res.on = function(type, listener){
if (type === 'header') {
deprecate('res.on("header"): use on-headers npm module instead');
onHeaders(this, listener);
return this;
}
return addListener.apply(this, arguments);
};
res._hasConnectPatch = true;
}
/**
* Determine if headers sent.
*
* @return {Boolean}
* @api private
*/
function headersSent(){
return Boolean(this._header);
}
/**
* Get unique elements in arr that are not in reference.
*
* @param {array} reference
* @param {array} arr
* @return {array}
* @api private
*/
function unique(reference, arr){
var array = [];
for (var i = 0; i < arr.length; i++) {
if (reference.indexOf(arr[i]) === -1) {
array.push(arr[i]);
}
}
return array;
}
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