/*!
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* http-errors
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* Copyright(c) 2014 Jonathan Ong
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* Copyright(c) 2016 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module dependencies.
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* @private
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*/
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var deprecate = require('depd')('http-errors')
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var setPrototypeOf = require('setprototypeof')
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var statuses = require('statuses')
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var inherits = require('inherits')
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/**
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* Module exports.
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* @public
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*/
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module.exports = createError
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module.exports.HttpError = createHttpErrorConstructor()
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// Populate exports for all constructors
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populateConstructorExports(module.exports, statuses.codes, module.exports.HttpError)
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/**
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* Get the code class of a status code.
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* @private
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*/
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function codeClass (status) {
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return Number(String(status).charAt(0) + '00')
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}
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/**
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* Create a new HTTP Error.
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*
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* @returns {Error}
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* @public
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*/
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function createError () {
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// so much arity going on ~_~
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var err
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var msg
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var status = 500
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var props = {}
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for (var i = 0; i < arguments.length; i++) {
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var arg = arguments[i]
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if (arg instanceof Error) {
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err = arg
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status = err.status || err.statusCode || status
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continue
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}
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switch (typeof arg) {
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case 'string':
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msg = arg
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break
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case 'number':
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status = arg
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if (i !== 0) {
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deprecate('non-first-argument status code; replace with createError(' + arg + ', ...)')
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}
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break
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case 'object':
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props = arg
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break
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}
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}
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if (typeof status === 'number' && (status < 400 || status >= 600)) {
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deprecate('non-error status code; use only 4xx or 5xx status codes')
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}
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if (typeof status !== 'number' ||
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(!statuses[status] && (status < 400 || status >= 600))) {
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status = 500
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}
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// constructor
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var HttpError = createError[status] || createError[codeClass(status)]
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if (!err) {
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// create error
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err = HttpError
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? new HttpError(msg)
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: new Error(msg || statuses[status])
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Error.captureStackTrace(err, createError)
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}
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if (!HttpError || !(err instanceof HttpError) || err.status !== status) {
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// add properties to generic error
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err.expose = status < 500
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err.status = err.statusCode = status
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}
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for (var key in props) {
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if (key !== 'status' && key !== 'statusCode') {
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err[key] = props[key]
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}
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}
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return err
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}
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/**
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* Create HTTP error abstract base class.
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* @private
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*/
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function createHttpErrorConstructor () {
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function HttpError () {
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throw new TypeError('cannot construct abstract class')
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}
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inherits(HttpError, Error)
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return HttpError
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}
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/**
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* Create a constructor for a client error.
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* @private
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*/
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function createClientErrorConstructor (HttpError, name, code) {
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var className = name.match(/Error$/) ? name : name + 'Error'
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function ClientError (message) {
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// create the error object
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var msg = message != null ? message : statuses[code]
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var err = new Error(msg)
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// capture a stack trace to the construction point
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Error.captureStackTrace(err, ClientError)
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// adjust the [[Prototype]]
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setPrototypeOf(err, ClientError.prototype)
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// redefine the error message
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Object.defineProperty(err, 'message', {
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enumerable: true,
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configurable: true,
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value: msg,
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writable: true
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})
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// redefine the error name
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Object.defineProperty(err, 'name', {
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enumerable: false,
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configurable: true,
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value: className,
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writable: true
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})
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return err
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}
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inherits(ClientError, HttpError)
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ClientError.prototype.status = code
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ClientError.prototype.statusCode = code
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ClientError.prototype.expose = true
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return ClientError
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}
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/**
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* Create a constructor for a server error.
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* @private
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*/
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function createServerErrorConstructor (HttpError, name, code) {
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var className = name.match(/Error$/) ? name : name + 'Error'
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function ServerError (message) {
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// create the error object
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var msg = message != null ? message : statuses[code]
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var err = new Error(msg)
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// capture a stack trace to the construction point
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Error.captureStackTrace(err, ServerError)
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// adjust the [[Prototype]]
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setPrototypeOf(err, ServerError.prototype)
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// redefine the error message
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Object.defineProperty(err, 'message', {
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enumerable: true,
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configurable: true,
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value: msg,
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writable: true
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})
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// redefine the error name
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Object.defineProperty(err, 'name', {
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enumerable: false,
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configurable: true,
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value: className,
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writable: true
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})
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return err
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}
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inherits(ServerError, HttpError)
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ServerError.prototype.status = code
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ServerError.prototype.statusCode = code
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ServerError.prototype.expose = false
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return ServerError
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}
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/**
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* Populate the exports object with constructors for every error class.
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* @private
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*/
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function populateConstructorExports (exports, codes, HttpError) {
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codes.forEach(function forEachCode (code) {
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var CodeError
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var name = toIdentifier(statuses[code])
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switch (codeClass(code)) {
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case 400:
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CodeError = createClientErrorConstructor(HttpError, name, code)
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break
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case 500:
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CodeError = createServerErrorConstructor(HttpError, name, code)
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break
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}
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if (CodeError) {
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// export the constructor
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exports[code] = CodeError
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exports[name] = CodeError
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}
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})
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// backwards-compatibility
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exports["I'mateapot"] = deprecate.function(exports.ImATeapot,
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'"I\'mateapot"; use "ImATeapot" instead')
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}
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/**
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* Convert a string of words to a JavaScript identifier.
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* @private
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*/
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function toIdentifier (str) {
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return str.split(' ').map(function (token) {
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return token.slice(0, 1).toUpperCase() + token.slice(1)
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}).join('').replace(/[^ _0-9a-z]/gi, '')
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}
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