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/*!
* Express - response
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var fs = require('fs')
, http = require('http')
, path = require('path')
, connect = require('connect')
, utils = connect.utils
, parseRange = require('./utils').parseRange
, res = http.ServerResponse.prototype
, send = connect.static.send
, mime = require('mime')
, basename = path.basename
, join = path.join;
/**
* Send a response with the given `body` and optional `headers` and `status` code.
*
* Examples:
*
* res.send();
* res.send(new Buffer('wahoo'));
* res.send({ some: 'json' });
* res.send('<p>some html</p>');
* res.send('Sorry, cant find that', 404);
* res.send('text', { 'Content-Type': 'text/plain' }, 201);
* res.send(404);
*
* @param {String|Object|Number|Buffer} body or status
* @param {Object|Number} headers or status
* @param {Number} status
* @return {ServerResponse}
* @api public
*/
res.send = function(body, headers, status){
// allow status as second arg
if ('number' == typeof headers) {
status = headers,
headers = null;
}
// default status
status = status || this.statusCode;
// allow 0 args as 204
if (!arguments.length || undefined === body) status = 204;
// determine content type
switch (typeof body) {
case 'number':
if (!this.header('Content-Type')) {
this.contentType('.txt');
}
body = http.STATUS_CODES[status = body];
break;
case 'string':
if (!this.header('Content-Type')) {
this.charset = this.charset || 'utf-8';
this.contentType('.html');
}
break;
case 'boolean':
case 'object':
if (Buffer.isBuffer(body)) {
if (!this.header('Content-Type')) {
this.contentType('.bin');
}
} else {
return this.json(body, headers, status);
}
break;
}
// populate Content-Length
if (undefined !== body && !this.header('Content-Length')) {
this.header('Content-Length', Buffer.isBuffer(body)
? body.length
: Buffer.byteLength(body));
}
// merge headers passed
if (headers) {
var fields = Object.keys(headers);
for (var i = 0, len = fields.length; i < len; ++i) {
var field = fields[i];
this.header(field, headers[field]);
}
}
// strip irrelevant headers
if (204 == status || 304 == status) {
this.removeHeader('Content-Type');
this.removeHeader('Content-Length');
body = '';
}
// respond
this.statusCode = status;
this.end('HEAD' == this.req.method ? null : body);
return this;
};
/**
* Send JSON response with `obj`, optional `headers`, and optional `status`.
*
* Examples:
*
* res.json(null);
* res.json({ user: 'tj' });
* res.json('oh noes!', 500);
* res.json('I dont have that', 404);
*
* @param {Mixed} obj
* @param {Object|Number} headers or status
* @param {Number} status
* @return {ServerResponse}
* @api public
*/
res.json = function(obj, headers, status){
var body = JSON.stringify(obj)
, callback = this.req.query.callback
, jsonp = this.app.enabled('jsonp callback');
this.charset = this.charset || 'utf-8';
this.header('Content-Type', 'application/json');
if (callback && jsonp) {
this.header('Content-Type', 'text/javascript');
body = callback.replace(/[^\w$.]/g, '') + '(' + body + ');';
}
return this.send(body, headers, status);
};
/**
* Set status `code`.
*
* @param {Number} code
* @return {ServerResponse}
* @api public
*/
res.status = function(code){
this.statusCode = code;
return this;
};
/**
* Transfer the file at the given `path`. Automatically sets
* the _Content-Type_ response header field. `next()` is called
* when `path` is a directory, or when an error occurs.
*
* Options:
*
* - `maxAge` defaulting to 0
* - `root` root directory for relative filenames
*
* @param {String} path
* @param {Object|Function} options or fn
* @param {Function} fn
* @api public
*/
res.sendfile = function(path, options, fn){
var next = this.req.next;
options = options || {};
// support function as second arg
if ('function' == typeof options) {
fn = options;
options = {};
}
options.path = encodeURIComponent(path);
options.callback = fn;
send(this.req, this, next, options);
};
/**
* Set _Content-Type_ response header passed through `mime.lookup()`.
*
* Examples:
*
* var filename = 'path/to/image.png';
* res.contentType(filename);
* // res.headers['Content-Type'] is now "image/png"
*
* res.contentType('.html');
* res.contentType('html');
* res.contentType('json');
* res.contentType('png');
*
* @param {String} type
* @return {String} the resolved mime type
* @api public
*/
res.contentType = function(type){
return this.header('Content-Type', mime.lookup(type));
};
/**
* Set _Content-Disposition_ header to _attachment_ with optional `filename`.
*
* @param {String} filename
* @return {ServerResponse}
* @api public
*/
res.attachment = function(filename){
if (filename) this.contentType(filename);
this.header('Content-Disposition', filename
? 'attachment; filename="' + basename(filename) + '"'
: 'attachment');
return this;
};
/**
* Transfer the file at the given `path`, with optional
* `filename` as an attachment and optional callback `fn(err)`,
* and optional `fn2(err)` which is invoked when an error has
* occurred after header has been sent.
*
* @param {String} path
* @param {String|Function} filename or fn
* @param {Function} fn
* @param {Function} fn2
* @api public
*/
res.download = function(path, filename, fn, fn2){
var self = this;
// support callback as second arg
if ('function' == typeof filename) {
fn2 = fn;
fn = filename;
filename = null;
}
// transfer the file
this.attachment(filename || path).sendfile(path, function(err){
var sentHeader = self._header;
if (err) {
if (!sentHeader) self.removeHeader('Content-Disposition');
if (sentHeader) {
fn2 && fn2(err);
} else if (fn) {
fn(err);
} else {
self.req.next(err);
}
} else if (fn) {
fn();
}
});
};
/**
* Set or get response header `name` with optional `val`.
*
* @param {String} name
* @param {String} val
* @return {ServerResponse} for chaining
* @api public
*/
res.header = function(name, val){
if (1 == arguments.length) return this.getHeader(name);
this.setHeader(name, val);
return this;
};
/**
* Clear cookie `name`.
*
* @param {String} name
* @param {Object} options
* @api public
*/
res.clearCookie = function(name, options){
var opts = { expires: new Date(1) };
this.cookie(name, '', options
? utils.merge(options, opts)
: opts);
};
/**
* Set cookie `name` to `val`, with the given `options`.
*
* Options:
*
* - `maxAge` max-age in milliseconds, converted to `expires`
* - `path` defaults to the "basepath" setting which is typically "/"
*
* Examples:
*
* // "Remember Me" for 15 minutes
* res.cookie('rememberme', '1', { expires: new Date(Date.now() + 900000), httpOnly: true });
*
* // save as above
* res.cookie('rememberme', '1', { maxAge: 900000, httpOnly: true })
*
* @param {String} name
* @param {String} val
* @param {Options} options
* @api public
*/
res.cookie = function(name, val, options){
options = options || {};
if ('maxAge' in options) options.expires = new Date(Date.now() + options.maxAge);
if (undefined === options.path) options.path = this.app.set('basepath');
var cookie = utils.serializeCookie(name, val, options);
this.header('Set-Cookie', cookie);
};
/**
* Redirect to the given `url` with optional response `status`
* defauling to 302.
*
* The given `url` can also be the name of a mapped url, for
* example by default express supports "back" which redirects
* to the _Referrer_ or _Referer_ headers or the application's
* "basepath" setting. Express also supports "basepath" out of the box,
* which can be set via `app.set('basepath', '/blog');`, and defaults
* to '/'.
*
* Redirect Mapping:
*
* To extend the redirect mapping capabilities that Express provides,
* we may use the `app.redirect()` method:
*
* app.redirect('google', 'http://google.com');
*
* Now in a route we may call:
*
* res.redirect('google');
*
* We may also map dynamic redirects:
*
* app.redirect('comments', function(req, res){
* return '/post/' + req.params.id + '/comments';
* });
*
* So now we may do the following, and the redirect will dynamically adjust to
* the context of the request. If we called this route with _GET /post/12_ our
* redirect _Location_ would be _/post/12/comments_.
*
* app.get('/post/:id', function(req, res){
* res.redirect('comments');
* });
*
* Unless an absolute `url` is given, the app's mount-point
* will be respected. For example if we redirect to `/posts`,
* and our app is mounted at `/blog` we will redirect to `/blog/posts`.
*
* @param {String} url
* @param {Number} code
* @api public
*/
res.redirect = function(url, status){
var app = this.app
, req = this.req
, base = app.set('basepath') || app.route
, status = status || 302
, head = 'HEAD' == req.method
, body;
// Setup redirect map
var map = {
back: req.header('Referrer', base)
, home: base
};
// Support custom redirect map
map.__proto__ = app.redirects;
// Attempt mapped redirect
var mapped = 'function' == typeof map[url]
? map[url](req, this)
: map[url];
// Perform redirect
url = mapped || url;
// Relative
if (!~url.indexOf('://')) {
// Respect mount-point
if ('/' != base && 0 != url.indexOf(base)) url = base + url;
// Absolute
var host = req.headers.host
, tls = req.connection.encrypted;
url = 'http' + (tls ? 's' : '') + '://' + host + url;
}
// Support text/{plain,html} by default
if (req.accepts('html')) {
body = '<p>' + http.STATUS_CODES[status] + '. Redirecting to <a href="' + url + '">' + url + '</a></p>';
this.header('Content-Type', 'text/html');
} else {
body = http.STATUS_CODES[status] + '. Redirecting to ' + url;
this.header('Content-Type', 'text/plain');
}
// Respond
this.statusCode = status;
this.header('Location', url);
this.end(head ? null : body);
};
/**
* Assign the view local variable `name` to `val` or return the
* local previously assigned to `name`.
*
* @param {String} name
* @param {Mixed} val
* @return {Mixed} val
* @api public
*/
res.local = function(name, val){
this._locals = this._locals || {};
return undefined === val
? this._locals[name]
: this._locals[name] = val;
};
/**
* Assign several locals with the given `obj`,
* or return the locals.
*
* @param {Object} obj
* @return {Object|Undefined}
* @api public
*/
res.locals =
res.helpers = function(obj){
if (obj) {
for (var key in obj) {
this.local(key, obj[key]);
}
} else {
return this._locals;
}
};