twitst4tz

twitter statistics web application
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index.js (2088B)

      1 /*!
      2  * statuses
      3  * Copyright(c) 2014 Jonathan Ong
      4  * Copyright(c) 2016 Douglas Christopher Wilson
      5  * MIT Licensed
      6  */
      7 
      8 'use strict'
      9 
     10 /**
     11  * Module dependencies.
     12  * @private
     13  */
     14 
     15 var codes = require('./codes.json')
     16 
     17 /**
     18  * Module exports.
     19  * @public
     20  */
     21 
     22 module.exports = status
     23 
     24 // status code to message map
     25 status.STATUS_CODES = codes
     26 
     27 // array of status codes
     28 status.codes = populateStatusesMap(status, codes)
     29 
     30 // status codes for redirects
     31 status.redirect = {
     32   300: true,
     33   301: true,
     34   302: true,
     35   303: true,
     36   305: true,
     37   307: true,
     38   308: true
     39 }
     40 
     41 // status codes for empty bodies
     42 status.empty = {
     43   204: true,
     44   205: true,
     45   304: true
     46 }
     47 
     48 // status codes for when you should retry the request
     49 status.retry = {
     50   502: true,
     51   503: true,
     52   504: true
     53 }
     54 
     55 /**
     56  * Populate the statuses map for given codes.
     57  * @private
     58  */
     59 
     60 function populateStatusesMap (statuses, codes) {
     61   var arr = []
     62 
     63   Object.keys(codes).forEach(function forEachCode (code) {
     64     var message = codes[code]
     65     var status = Number(code)
     66 
     67     // Populate properties
     68     statuses[status] = message
     69     statuses[message] = status
     70     statuses[message.toLowerCase()] = status
     71 
     72     // Add to array
     73     arr.push(status)
     74   })
     75 
     76   return arr
     77 }
     78 
     79 /**
     80  * Get the status code.
     81  *
     82  * Given a number, this will throw if it is not a known status
     83  * code, otherwise the code will be returned. Given a string,
     84  * the string will be parsed for a number and return the code
     85  * if valid, otherwise will lookup the code assuming this is
     86  * the status message.
     87  *
     88  * @param {string|number} code
     89  * @returns {number}
     90  * @public
     91  */
     92 
     93 function status (code) {
     94   if (typeof code === 'number') {
     95     if (!status[code]) throw new Error('invalid status code: ' + code)
     96     return code
     97   }
     98 
     99   if (typeof code !== 'string') {
    100     throw new TypeError('code must be a number or string')
    101   }
    102 
    103   // '403'
    104   var n = parseInt(code, 10)
    105   if (!isNaN(n)) {
    106     if (!status[n]) throw new Error('invalid status code: ' + n)
    107     return n
    108   }
    109 
    110   n = status[code.toLowerCase()]
    111   if (!n) throw new Error('invalid status message: "' + code + '"')
    112   return n
    113 }