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/*!
* statuses
* Copyright(c) 2014 Jonathan Ong
* Copyright(c) 2016 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
* @private
*/
var codes = require('./codes.json')
/**
* Module exports.
* @public
*/
module.exports = status
// status code to message map
status.message = codes
// status message (lower-case) to code map
status.code = createMessageToStatusCodeMap(codes)
// array of status codes
status.codes = createStatusCodeList(codes)
// status codes for redirects
status.redirect = {
300: true,
301: true,
302: true,
303: true,
305: true,
307: true,
308: true
}
// status codes for empty bodies
status.empty = {
204: true,
205: true,
304: true
}
// status codes for when you should retry the request
status.retry = {
502: true,
503: true,
504: true
}
/**
* Create a map of message to status code.
* @private
*/
function createMessageToStatusCodeMap (codes) {
var map = {}
Object.keys(codes).forEach(function forEachCode (code) {
var message = codes[code]
var status = Number(code)
// populate map
map[message.toLowerCase()] = status
})
return map
}
/**
* Create a list of all status codes.
* @private
*/
function createStatusCodeList (codes) {
return Object.keys(codes).map(function mapCode (code) {
return Number(code)
})
}
/**
* Get the status code for given message.
* @private
*/
function getStatusCode (message) {
var msg = message.toLowerCase()
if (!Object.prototype.hasOwnProperty.call(status.code, msg)) {
throw new Error('invalid status message: "' + message + '"')
}
return status.code[msg]
}
/**
* Get the status message for given code.
* @private
*/
function getStatusMessage (code) {
if (!Object.prototype.hasOwnProperty.call(status.message, code)) {
throw new Error('invalid status code: ' + code)
}
return status.message[code]
}
/**
* Get the status code.
*
* Given a number, this will throw if it is not a known status
* code, otherwise the code will be returned. Given a string,
* the string will be parsed for a number and return the code
* if valid, otherwise will lookup the code assuming this is
* the status message.
*
* @param {string|number} code
* @returns {number}
* @public
*/
function status (code) {
if (typeof code === 'number') {
return getStatusMessage(code)
}
if (typeof code !== 'string') {
throw new TypeError('code must be a number or string')
}
// '403'
var n = parseInt(code, 10)
if (!isNaN(n)) {
return getStatusMessage(n)
}
return getStatusCode(code)
}
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