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response.js
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response.js
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/**
* Module dependencies.
*/
var http = require('http')
, path = require('path')
, connect = require('connect')
, mixin = require('utils-merge')
, escapeHtml = require('escape-html')
, sign = require('cookie-signature').sign
, normalizeType = require('./utils').normalizeType
, normalizeTypes = require('./utils').normalizeTypes
, etag = require('./utils').etag
, statusCodes = http.STATUS_CODES
, cookie = require('cookie')
, send = require('send')
, mime = connect.mime
, resolve = require('url').resolve
, basename = path.basename
, extname = path.extname;
/**
* Response prototype.
*/
var res = module.exports = {
__proto__: http.ServerResponse.prototype
};
/**
* Set status `code`.
*
* @param {Number} code
* @return {ServerResponse}
* @api public
*/
res.status = function(code){
this.statusCode = code;
return this;
};
/**
* Set Link header field with the given `links`.
*
* Examples:
*
* res.links({
* next: 'http://api.example.com/users?page=2',
* last: 'http://api.example.com/users?page=5'
* });
*
* @param {Object} links
* @return {ServerResponse}
* @api public
*/
res.links = function(links){
var link = this.get('Link') || '';
if (link) link += ', ';
return this.set('Link', link + Object.keys(links).map(function(rel){
return '<' + links[rel] + '>; rel="' + rel + '"';
}).join(', '));
};
/**
* Send a response.
*
* Examples:
*
* res.send(new Buffer('wahoo'));
* res.send({ some: 'json' });
* res.send('<p>some html</p>');
* res.send(404, 'Sorry, cant find that');
* res.send(404);
*
* @param {Mixed} body or status
* @param {Mixed} body
* @return {ServerResponse}
* @api public
*/
res.send = function(body){
var req = this.req;
var head = 'HEAD' == req.method;
var len;
// settings
var app = this.app;
// allow status / body
if (2 == arguments.length) {
// res.send(body, status) backwards compat
if ('number' != typeof body && 'number' == typeof arguments[1]) {
this.statusCode = arguments[1];
} else {
this.statusCode = body;
body = arguments[1];
}
}
switch (typeof body) {
// response status
case 'number':
this.get('Content-Type') || this.type('txt');
this.statusCode = body;
body = http.STATUS_CODES[body];
break;
// string defaulting to html
case 'string':
if (!this.get('Content-Type')) {
this.charset = this.charset || 'utf-8';
this.type('html');
}
break;
case 'boolean':
case 'object':
if (null == body) {
body = '';
} else if (Buffer.isBuffer(body)) {
this.get('Content-Type') || this.type('bin');
} else {
return this.json(body);
}
break;
}
// populate Content-Length
if (undefined !== body && !this.get('Content-Length')) {
this.set('Content-Length', len = Buffer.isBuffer(body)
? body.length
: Buffer.byteLength(body));
}
// ETag support
// TODO: W/ support
if (app.settings.etag && len && 'GET' == req.method) {
if (!this.get('ETag')) {
this.set('ETag', etag(body));
}
}
// freshness
if (req.fresh) this.statusCode = 304;
// strip irrelevant headers
if (204 == this.statusCode || 304 == this.statusCode) {
this.removeHeader('Content-Type');
this.removeHeader('Content-Length');
this.removeHeader('Transfer-Encoding');
body = '';
}
// respond
this.end(head ? null : body);
return this;
};
/**
* Send JSON response.
*
* Examples:
*
* res.json(null);
* res.json({ user: 'tj' });
* res.json(500, 'oh noes!');
* res.json(404, 'I dont have that');
*
* @param {Mixed} obj or status
* @param {Mixed} obj
* @return {ServerResponse}
* @api public
*/
res.json = function(obj){
// allow status / body
if (2 == arguments.length) {
// res.json(body, status) backwards compat
if ('number' == typeof arguments[1]) {
this.statusCode = arguments[1];
} else {
this.statusCode = obj;
obj = arguments[1];
}
}
// settings
var app = this.app;
var replacer = app.get('json replacer');
var spaces = app.get('json spaces');
var body = JSON.stringify(obj, replacer, spaces);
// content-type
this.charset = this.charset || 'utf-8';
this.get('Content-Type') || this.set('Content-Type', 'application/json');
return this.send(body);
};
/**
* Send JSON response with JSONP callback support.
*
* Examples:
*
* res.jsonp(null);
* res.jsonp({ user: 'tj' });
* res.jsonp(500, 'oh noes!');
* res.jsonp(404, 'I dont have that');
*
* @param {Mixed} obj or status
* @param {Mixed} obj
* @return {ServerResponse}
* @api public
*/
res.jsonp = function(obj){
// allow status / body
if (2 == arguments.length) {
// res.json(body, status) backwards compat
if ('number' == typeof arguments[1]) {
this.statusCode = arguments[1];
} else {
this.statusCode = obj;
obj = arguments[1];
}
}
// settings
var app = this.app;
var replacer = app.get('json replacer');
var spaces = app.get('json spaces');
var body = JSON.stringify(obj, replacer, spaces)
.replace(/\u2028/g, '\\u2028')
.replace(/\u2029/g, '\\u2029');
var callback = this.req.query[app.get('jsonp callback name')];
// content-type
this.charset = this.charset || 'utf-8';
this.set('Content-Type', 'application/json');
// jsonp
if (callback) {
if (Array.isArray(callback)) callback = callback[0];
this.set('Content-Type', 'text/javascript');
var cb = callback.replace(/[^\[\]\w$.]/g, '');
body = 'typeof ' + cb + ' === \'function\' && ' + cb + '(' + body + ');';
}
return this.send(body);
};
/**
* Transfer the file at the given `path`.
*
* Automatically sets the _Content-Type_ response header field.
* The callback `fn(err)` is invoked when the transfer is complete
* or when an error occurs. Be sure to check `res.sentHeader`
* if you wish to attempt responding, as the header and some data
* may have already been transferred.
*
* Options:
*
* - `maxAge` defaulting to 0
* - `root` root directory for relative filenames
*
* Examples:
*
* The following example illustrates how `res.sendfile()` may
* be used as an alternative for the `static()` middleware for
* dynamic situations. The code backing `res.sendfile()` is actually
* the same code, so HTTP cache support etc is identical.
*
* app.get('/user/:uid/photos/:file', function(req, res){
* var uid = req.params.uid
* , file = req.params.file;
*
* req.user.mayViewFilesFrom(uid, function(yes){
* if (yes) {
* res.sendfile('/uploads/' + uid + '/' + file);
* } else {
* res.send(403, 'Sorry! you cant see that.');
* }
* });
* });
*
* @param {String} path
* @param {Object|Function} options or fn
* @param {Function} fn
* @api public
*/
res.sendfile = function(path, options, fn){
var self = this
, req = self.req
, next = this.req.next
, options = options || {}
, done;
// support function as second arg
if ('function' == typeof options) {
fn = options;
options = {};
}
// socket errors
req.socket.on('error', error);
// errors
function error(err) {
if (done) return;
done = true;
// clean up
cleanup();
if (!self.headerSent) self.removeHeader('Content-Disposition');
// callback available
if (fn) return fn(err);
// list in limbo if there's no callback
if (self.headerSent) return;
// delegate
next(err);
}
// streaming
function stream(stream) {
if (done) return;
cleanup();
if (fn) stream.on('end', fn);
}
// cleanup
function cleanup() {
req.socket.removeListener('error', error);
}
// transfer
var file = send(req, path);
if (options.root) file.root(options.root);
file.maxage(options.maxAge || 0);
file.on('error', error);
file.on('directory', next);
file.on('stream', stream);
file.pipe(this);
this.on('finish', cleanup);
};
/**
* Transfer the file at the given `path` as an attachment.
*
* Optionally providing an alternate attachment `filename`,
* and optional callback `fn(err)`. The callback is invoked
* when the data transfer is complete, or when an error has
* ocurred. Be sure to check `res.headerSent` if you plan to respond.
*
* This method uses `res.sendfile()`.
*
* @param {String} path
* @param {String|Function} filename or fn
* @param {Function} fn
* @api public
*/
res.download = function(path, filename, fn){
// support function as second arg
if ('function' == typeof filename) {
fn = filename;
filename = null;
}
filename = filename || path;
this.set('Content-Disposition', 'attachment; filename="' + basename(filename) + '"');
return this.sendfile(path, fn);
};
/**
* Set _Content-Type_ response header with `type` through `mime.lookup()`
* when it does not contain "/", or set the Content-Type to `type` otherwise.
*
* Examples:
*
* res.type('.html');
* res.type('html');
* res.type('json');
* res.type('application/json');
* res.type('png');
*
* @param {String} type
* @return {ServerResponse} for chaining
* @api public
*/
res.contentType =
res.type = function(type){
return this.set('Content-Type', ~type.indexOf('/')
? type
: mime.lookup(type));
};
/**
* Respond to the Acceptable formats using an `obj`
* of mime-type callbacks.
*
* This method uses `req.accepted`, an array of
* acceptable types ordered by their quality values.
* When "Accept" is not present the _first_ callback
* is invoked, otherwise the first match is used. When
* no match is performed the server responds with
* 406 "Not Acceptable".
*
* Content-Type is set for you, however if you choose
* you may alter this within the callback using `res.type()`
* or `res.set('Content-Type', ...)`.
*
* res.format({
* 'text/plain': function(){
* res.send('hey');
* },
*
* 'text/html': function(){
* res.send('<p>hey</p>');
* },
*
* 'appliation/json': function(){
* res.send({ message: 'hey' });
* }
* });
*
* In addition to canonicalized MIME types you may
* also use extnames mapped to these types:
*
* res.format({
* text: function(){
* res.send('hey');
* },
*
* html: function(){
* res.send('<p>hey</p>');
* },
*
* json: function(){
* res.send({ message: 'hey' });
* }
* });
*
* By default Express passes an `Error`
* with a `.status` of 406 to `next(err)`
* if a match is not made. If you provide
* a `.default` callback it will be invoked
* instead.
*
* @param {Object} obj
* @return {ServerResponse} for chaining
* @api public
*/
res.format = function(obj){
var req = this.req
, next = req.next;
var fn = obj.default;
if (fn) delete obj.default;
var keys = Object.keys(obj);
var key = req.accepts(keys);
this.vary("Accept");
if (key) {
var type = normalizeType(key).value;
var charset = mime.charsets.lookup(type);
if (charset) type += '; charset=' + charset;
this.set('Content-Type', type);
obj[key](req, this, next);
} else if (fn) {
fn();
} else {
var err = new Error('Not Acceptable');
err.status = 406;
err.types = normalizeTypes(keys).map(function(o){ return o.value });
next(err);
}
return this;
};
/**
* Set _Content-Disposition_ header to _attachment_ with optional `filename`.
*
* @param {String} filename
* @return {ServerResponse}
* @api public
*/
res.attachment = function(filename){
if (filename) this.type(extname(filename));
this.set('Content-Disposition', filename
? 'attachment; filename="' + basename(filename) + '"'
: 'attachment');
return this;
};
/**
* Set header `field` to `val`, or pass
* an object of header fields.
*
* Examples:
*
* res.set('Foo', ['bar', 'baz']);
* res.set('Accept', 'application/json');
* res.set({ Accept: 'text/plain', 'X-API-Key': 'tobi' });
*
* Aliased as `res.header()`.
*
* @param {String|Object|Array} field
* @param {String} val
* @return {ServerResponse} for chaining
* @api public
*/
res.set =
res.header = function(field, val){
if (2 == arguments.length) {
if (Array.isArray(val)) val = val.map(String);
else val = String(val);
this.setHeader(field, val);
} else {
for (var key in field) {
this.set(key, field[key]);
}
}
return this;
};
/**
* Get value for header `field`.
*
* @param {String} field
* @return {String}
* @api public
*/
res.get = function(field){
return this.getHeader(field);
};
/**
* Clear cookie `name`.
*
* @param {String} name
* @param {Object} options
* @param {ServerResponse} for chaining
* @api public
*/
res.clearCookie = function(name, options){
var opts = { expires: new Date(1), path: '/' };
return this.cookie(name, '', options
? mixin(opts, options)
: opts);
};
/**
* Set cookie `name` to `val`, with the given `options`.
*
* Options:
*
* - `maxAge` max-age in milliseconds, converted to `expires`
* - `signed` sign the cookie
* - `path` defaults to "/"
*
* 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|Object} val
* @param {Options} options
* @api public
*/
res.cookie = function(name, val, options){
options = mixin({}, options);
var secret = this.req.secret;
var signed = options.signed;
if (signed && !secret) throw new Error('connect.cookieParser("secret") required for signed cookies');
if ('number' == typeof val) val = val.toString();
if ('object' == typeof val) val = 'j:' + JSON.stringify(val);
if (signed) val = 's:' + sign(val, secret);
if ('maxAge' in options) {
options.expires = new Date(Date.now() + options.maxAge);
options.maxAge /= 1000;
}
if (null == options.path) options.path = '/';
this.set('Set-Cookie', cookie.serialize(name, String(val), options));
return this;
};
/**
* Set the location header to `url`.
*
* The given `url` can also be "back", which redirects
* to the _Referrer_ or _Referer_ headers or "/".
*
* Examples:
*
* res.location('/foo/bar').;
* res.location('http://example.com');
* res.location('../login');
*
* @param {String} url
* @api public
*/
res.location = function(url){
var req = this.req;
// "back" is an alias for the referrer
if ('back' == url) url = req.get('Referrer') || '/';
// Respond
this.set('Location', url);
return this;
};
/**
* Redirect to the given `url` with optional response `status`
* defaulting to 302.
*
* The resulting `url` is determined by `res.location()`, so
* it will play nicely with mounted apps, relative paths,
* `"back"` etc.
*
* Examples:
*
* res.redirect('/foo/bar');
* res.redirect('http://example.com');
* res.redirect(301, 'http://example.com');
* res.redirect('http://example.com', 301);
* res.redirect('../login'); // /blog/post/1 -> /blog/login
*
* @param {String} url
* @param {Number} code
* @api public
*/
res.redirect = function(url){
var head = 'HEAD' == this.req.method
, status = 302
, body;
// allow status / url
if (2 == arguments.length) {
if ('number' == typeof url) {
status = url;
url = arguments[1];
} else {
status = arguments[1];
}
}
// Set location header
this.location(url);
url = this.get('Location');
// Support text/{plain,html} by default
this.format({
text: function(){
body = statusCodes[status] + '. Redirecting to ' + encodeURI(url);
},
html: function(){
var u = escapeHtml(url);
body = '<p>' + statusCodes[status] + '. Redirecting to <a href="' + u + '">' + u + '</a></p>';
},
default: function(){
body = '';
}
});
// Respond
this.statusCode = status;
this.set('Content-Length', Buffer.byteLength(body));
this.end(head ? null : body);
};
/**
* Add `field` to Vary. If already present in the Vary set, then
* this call is simply ignored.
*
* @param {Array|String} field
* @param {ServerResponse} for chaining
* @api public
*/
res.vary = function(field){
var self = this;
// nothing
if (!field) return this;
// array
if (Array.isArray(field)) {
field.forEach(function(field){
self.vary(field);
});
return;
}
var vary = this.get('Vary');
// append
if (vary) {
vary = vary.split(/ *, */);
if (!~vary.indexOf(field)) vary.push(field);
this.set('Vary', vary.join(', '));
return this;
}
// set
this.set('Vary', field);
return this;
};
/**
* Render `view` with the given `options` and optional callback `fn`.
* When a callback function is given a response will _not_ be made
* automatically, otherwise a response of _200_ and _text/html_ is given.
*
* Options:
*
* - `cache` boolean hinting to the engine it should cache
* - `filename` filename of the view being rendered
*
* @param {String} view
* @param {Object|Function} options or callback function
* @param {Function} fn
* @api public
*/
res.render = function(view, options, fn){
var self = this
, options = options || {}
, req = this.req
, app = req.app;
// support callback function as second arg
if ('function' == typeof options) {
fn = options, options = {};
}
// merge res.locals
options._locals = self.locals;
// default callback to respond
fn = fn || function(err, str){
if (err) return req.next(err);
self.send(str);
};
// render
app.render(view, options, fn);
};