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