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NodeJSBlog

node_modules

finalhandler

index.js

index.js 6.37 KB

/*!
 * finalhandler
 * Copyright(c) 2014-2017 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

/**
 * Module dependencies.
 * @private
 */

var debug = require('debug')('finalhandler')
var encodeUrl = require('encodeurl')
var escapeHtml = require('escape-html')
var onFinished = require('on-finished')
var parseUrl = require('parseurl')
var statuses = require('statuses')
var unpipe = require('unpipe')

/**
 * Module variables.
 * @private
 */

var DOUBLE_SPACE_REGEXP = /\x20{2}/g
var NEWLINE_REGEXP = /\n/g

/* istanbul ignore next */
var defer = typeof setImmediate === 'function'
 ? setImmediate
 : function (fn) { process.nextTick(fn.bind.apply(fn, arguments)) }
var isFinished = onFinished.isFinished

/**
 * Create a minimal HTML document.
 *
 * @param {string} message
 * @private
 */

function createHtmlDocument (message) {
 var body = escapeHtml(message)
 .replace(NEWLINE_REGEXP, '<br>')
 .replace(DOUBLE_SPACE_REGEXP, ' &nbsp;')

return '<!DOCTYPE html>\n' +
 '<html lang="en">\n' +
 '<head>\n' +
 '<meta charset="utf-8">\n' +
 '<title>Error</title>\n' +
 '</head>\n' +
 '<body>\n' +
 '<pre>' + body + '</pre>\n' +
 '</body>\n' +
 '</html>\n'
}

/**
 * Module exports.
 * @public
 */

module.exports = finalhandler

/**
 * Create a function to handle the final response.
 *
 * @param {Request} req
 * @param {Response} res
 * @param {Object} [options]
 * @return {Function}
 * @public
 */

function finalhandler (req, res, options) {
 var opts = options || {}

// get environment
 var env = opts.env || process.env.NODE_ENV || 'development'

// get error callback
 var onerror = opts.onerror

return function (err) {
 var headers
 var msg
 var status

// ignore 404 on in-flight response
 if (!err && headersSent(res)) {
 debug('cannot 404 after headers sent')
 return
 }

// unhandled error
 if (err) {
 // respect status code from error
 status = getErrorStatusCode(err)

if (status === undefined) {
 // fallback to status code on response
 status = getResponseStatusCode(res)
 } else {
 // respect headers from error
 headers = getErrorHeaders(err)
 }

// get error message
 msg = getErrorMessage(err, status, env)
 } else {
 // not found
 status = 404
 msg = 'Cannot ' + req.method + ' ' + encodeUrl(getResourceName(req))
 }

debug('default %s', status)

// schedule onerror callback
 if (err && onerror) {
 defer(onerror, err, req, res)
 }

// cannot actually respond
 if (headersSent(res)) {
 debug('cannot %d after headers sent', status)
 req.socket.destroy()
 return
 }

// send response
 send(req, res, status, headers, msg)
 }
}

/**
 * Get headers from Error object.
 *
 * @param {Error} err
 * @return {object}
 * @private
 */

function getErrorHeaders (err) {
 if (!err.headers || typeof err.headers !== 'object') {
 return undefined
 }

var headers = Object.create(null)
 var keys = Object.keys(err.headers)

for (var i = 0; i < keys.length; i++) {
 var key = keys[i]
 headers[key] = err.headers[key]
 }

return headers
}

/**
 * Get message from Error object, fallback to status message.
 *
 * @param {Error} err
 * @param {number} status
 * @param {string} env
 * @return {string}
 * @private
 */

function getErrorMessage (err, status, env) {
 var msg

if (env !== 'production') {
 // use err.stack, which typically includes err.message
 msg = err.stack

// fallback to err.toString() when possible
 if (!msg && typeof err.toString === 'function') {
 msg = err.toString()
 }
 }

return msg || statuses[status]
}

/**
 * Get status code from Error object.
 *
 * @param {Error} err
 * @return {number}
 * @private
 */

function getErrorStatusCode (err) {
 // check err.status
 if (typeof err.status === 'number' && err.status >= 400 && err.status < 600) {
 return err.status
 }

// check err.statusCode
 if (typeof err.statusCode === 'number' && err.statusCode >= 400 && err.statusCode < 600) {
 return err.statusCode
 }

return undefined
}

/**
 * Get resource name for the request.
 *
 * This is typically just the original pathname of the request
 * but will fallback to "resource" is that cannot be determined.
 *
 * @param {IncomingMessage} req
 * @return {string}
 * @private
 */

function getResourceName (req) {
 try {
 return parseUrl.original(req).pathname
 } catch (e) {
 return 'resource'
 }
}

/**
 * Get status code from response.
 *
 * @param {OutgoingMessage} res
 * @return {number}
 * @private
 */

function getResponseStatusCode (res) {
 var status = res.statusCode

// default status code to 500 if outside valid range
 if (typeof status !== 'number' || status < 400 || status > 599) {
 status = 500
 }

return status
}

/**
 * Determine if the response headers have been sent.
 *
 * @param {object} res
 * @returns {boolean}
 * @private
 */

function headersSent (res) {
 return typeof res.headersSent !== 'boolean'
 ? Boolean(res._header)
 : res.headersSent
}

/**
 * Send response.
 *
 * @param {IncomingMessage} req
 * @param {OutgoingMessage} res
 * @param {number} status
 * @param {object} headers
 * @param {string} message
 * @private
 */

function send (req, res, status, headers, message) {
 function write () {
 // response body
 var body = createHtmlDocument(message)

// response status
 res.statusCode = status
 res.statusMessage = statuses[status]

// response headers
 setHeaders(res, headers)

// security headers
 res.setHeader('Content-Security-Policy', "default-src 'self'")
 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()
}

/**
 * Set response headers from an object.
 *
 * @param {OutgoingMessage} res
 * @param {object} headers
 * @private
 */

function setHeaders (res, headers) {
 if (!headers) {
 return
 }

var keys = Object.keys(headers)
 for (var i = 0; i < keys.length; i++) {
 var key = keys[i]
 res.setHeader(key, headers[key])
 }
}

一键复制编辑原始数据按行查看历史

ittqqzz 提交于 2018年03月19日 15:14 +08:00 . 通过app.get来路由

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/*!
 * finalhandler
 * Copyright(c) 2014-2017 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

/**
 * Module dependencies.
 * @private
 */

var debug = require('debug')('finalhandler')
var encodeUrl = require('encodeurl')
var escapeHtml = require('escape-html')
var onFinished = require('on-finished')
var parseUrl = require('parseurl')
var statuses = require('statuses')
var unpipe = require('unpipe')

/**
 * Module variables.
 * @private
 */

var DOUBLE_SPACE_REGEXP = /\x20{2}/g
var NEWLINE_REGEXP = /\n/g

/* istanbul ignore next */
var defer = typeof setImmediate === 'function'
 ? setImmediate
 : function (fn) { process.nextTick(fn.bind.apply(fn, arguments)) }
var isFinished = onFinished.isFinished

/**
 * Create a minimal HTML document.
 *
 * @param {string} message
 * @private
 */

function createHtmlDocument (message) {
 var body = escapeHtml(message)
 .replace(NEWLINE_REGEXP, '<br>')
 .replace(DOUBLE_SPACE_REGEXP, ' &nbsp;')

 return '<!DOCTYPE html>\n' +
 '<html lang="en">\n' +
 '<head>\n' +
 '<meta charset="utf-8">\n' +
 '<title>Error</title>\n' +
 '</head>\n' +
 '<body>\n' +
 '<pre>' + body + '</pre>\n' +
 '</body>\n' +
 '</html>\n'
}

/**
 * Module exports.
 * @public
 */

module.exports = finalhandler

/**
 * Create a function to handle the final response.
 *
 * @param {Request} req
 * @param {Response} res
 * @param {Object} [options]
 * @return {Function}
 * @public
 */

function finalhandler (req, res, options) {
 var opts = options || {}

 // get environment
 var env = opts.env || process.env.NODE_ENV || 'development'

 // get error callback
 var onerror = opts.onerror

 return function (err) {
 var headers
 var msg
 var status

 // ignore 404 on in-flight response
 if (!err && headersSent(res)) {
 debug('cannot 404 after headers sent')
 return
 }

 // unhandled error
 if (err) {
 // respect status code from error
 status = getErrorStatusCode(err)

 if (status === undefined) {
 // fallback to status code on response
 status = getResponseStatusCode(res)
 } else {
 // respect headers from error
 headers = getErrorHeaders(err)
 }

 // get error message
 msg = getErrorMessage(err, status, env)
 } else {
 // not found
 status = 404
 msg = 'Cannot ' + req.method + '' + encodeUrl(getResourceName(req))
 }

 debug('default %s', status)

 // schedule onerror callback
 if (err && onerror) {
 defer(onerror, err, req, res)
 }

 // cannot actually respond
 if (headersSent(res)) {
 debug('cannot %d after headers sent', status)
 req.socket.destroy()
 return
 }

 // send response
 send(req, res, status, headers, msg)
 }
}

/**
 * Get headers from Error object.
 *
 * @param {Error} err
 * @return {object}
 * @private
 */

function getErrorHeaders (err) {
 if (!err.headers || typeof err.headers !== 'object') {
 return undefined
 }

 var headers = Object.create(null)
 var keys = Object.keys(err.headers)

 for (var i = 0; i < keys.length; i++) {
 var key = keys[i]
 headers[key] = err.headers[key]
 }

 return headers
}

/**
 * Get message from Error object, fallback to status message.
 *
 * @param {Error} err
 * @param {number} status
 * @param {string} env
 * @return {string}
 * @private
 */

function getErrorMessage (err, status, env) {
 var msg

 if (env !== 'production') {
 // use err.stack, which typically includes err.message
 msg = err.stack

 // fallback to err.toString() when possible
 if (!msg && typeof err.toString === 'function') {
 msg = err.toString()
 }
 }

 return msg || statuses[status]
}

/**
 * Get status code from Error object.
 *
 * @param {Error} err
 * @return {number}
 * @private
 */

function getErrorStatusCode (err) {
 // check err.status
 if (typeof err.status === 'number' && err.status >= 400 && err.status < 600) {
 return err.status
 }

 // check err.statusCode
 if (typeof err.statusCode === 'number' && err.statusCode >= 400 && err.statusCode < 600) {
 return err.statusCode
 }

 return undefined
}

/**
 * Get resource name for the request.
 *
 * This is typically just the original pathname of the request
 * but will fallback to "resource" is that cannot be determined.
 *
 * @param {IncomingMessage} req
 * @return {string}
 * @private
 */

function getResourceName (req) {
 try {
 return parseUrl.original(req).pathname
 } catch (e) {
 return 'resource'
 }
}

/**
 * Get status code from response.
 *
 * @param {OutgoingMessage} res
 * @return {number}
 * @private
 */

function getResponseStatusCode (res) {
 var status = res.statusCode

 // default status code to 500 if outside valid range
 if (typeof status !== 'number' || status < 400 || status > 599) {
 status = 500
 }

 return status
}

/**
 * Determine if the response headers have been sent.
 *
 * @param {object} res
 * @returns {boolean}
 * @private
 */

function headersSent (res) {
 return typeof res.headersSent !== 'boolean'
 ? Boolean(res._header)
 : res.headersSent
}

/**
 * Send response.
 *
 * @param {IncomingMessage} req
 * @param {OutgoingMessage} res
 * @param {number} status
 * @param {object} headers
 * @param {string} message
 * @private
 */

function send (req, res, status, headers, message) {
 function write () {
 // response body
 var body = createHtmlDocument(message)

 // response status
 res.statusCode = status
 res.statusMessage = statuses[status]

 // response headers
 setHeaders(res, headers)

 // security headers
 res.setHeader('Content-Security-Policy', "default-src 'self'")
 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()
}

/**
 * Set response headers from an object.
 *
 * @param {OutgoingMessage} res
 * @param {object} headers
 * @private
 */

function setHeaders (res, headers) {
 if (!headers) {
 return
 }

 var keys = Object.keys(headers)
 for (var i = 0; i < keys.length; i++) {
 var key = keys[i]
 res.setHeader(key, headers[key])
 }
}