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/*!
* finalhandler
* Copyright(c) 2014 Douglas Christopher Wilson
* MIT Licensed
*/
/**
* Module dependencies.
*/
var debug = require('debug')('finalhandler')
var escapeHtml = require('escape-html')
var http = require('http')
var onFinished = require('on-finished')
/**
* Variables.
*/
/* istanbul ignore next */
var defer = typeof setImmediate === 'function'
? setImmediate
: function(fn){ process.nextTick(fn.bind.apply(fn, arguments)) }
var isFinished = onFinished.isFinished
/**
* Module exports.
*/
module.exports = finalhandler
/**
* Final handler:
*
* @param {Request} req
* @param {Response} res
* @param {Object} [options]
* @return {Function}
* @api public
*/
function finalhandler(req, res, options) {
options = options || {}
// get environment
var env = options.env || process.env.NODE_ENV || 'development'
// get error callback
var onerror = options.onerror
return function (err) {
var msg
// ignore 404 on in-flight response
if (!err && res._header) {
debug('cannot 404 after headers sent')
return
}
// unhandled error
if (err) {
// default status code to 500
if (!res.statusCode || res.statusCode < 400) {
res.statusCode = 500
}
// respect err.status
if (err.status) {
res.statusCode = err.status
}
// production gets a basic error message
var msg = env === 'production'
? http.STATUS_CODES[res.statusCode]
: err.stack || err.toString()
msg = escapeHtml(msg)
.replace(/\n/g, '<br>')
.replace(/ /g, ' ') + '\n'
} else {
res.statusCode = 404
msg = 'Cannot ' + escapeHtml(req.method) + ' ' + escapeHtml(req.originalUrl || req.url) + '\n'
}
debug('default %s', res.statusCode)
// schedule onerror callback
if (err && onerror) {
defer(onerror, err, req, res)
}
// cannot actually respond
if (res._header) {
return req.socket.destroy()
}
send(req, res, res.statusCode, msg)
}
}
/**
* Send response.
*
* @param {IncomingMessage} req
* @param {OutgoingMessage} res
* @param {number} status
* @param {string} body
* @api private
*/
function send(req, res, status, body) {
function write() {
res.statusCode = status
// security header for content sniffing
res.setHeader('X-Content-Type-Options', 'nosniff')
// standard headers
res.setHeader('Content-Type', 'text/html; charset=utf-8')
res.setHeader('Content-Length', Buffer.byteLength(body, 'utf8'))
if (req.method === 'HEAD') {
res.end()
return
}
res.end(body, 'utf8')
}
if (isFinished(req)) {
write()
return
}
// unpipe everything from the request
unpipe(req)
// flush the request
onFinished(req, write)
req.resume()
}
/**
* Unpipe everything from a stream.
*
* @param {Object} stream
* @api private
*/
/* istanbul ignore next: implementation differs between versions */
function unpipe(stream) {
if (typeof stream.unpipe === 'function') {
// new-style
stream.unpipe()
return
}
// Node.js 0.8 hack
var listener
var listeners = stream.listeners('close')
for (var i = 0; i < listeners.length; i++) {
listener = listeners[i]
if (listener.name !== 'cleanup' && listener.name !== 'onclose') {
continue
}
// invoke the listener
listener.call(stream)
}
}
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