server/helpers/custom-validators/misc.ts

   1 import 'multer'
   2 import * as validator from 'validator'
   3
   4 function exists (value: any) {
   5   return value !== undefined && value !== null
   6 }
   7
   8 function isArray (value: any) {
   9   return Array.isArray(value)
  10 }
  11
  12 function isNotEmptyIntArray (value: any) {
  13   return Array.isArray(value) && value.every(v => validator.isInt('' + v)) && value.length !== 0
  14 }
  15
  16 function isArrayOf (value: any, validator: (value: any) => boolean) {
  17   return isArray(value) && value.every(v => validator(v))
  18 }
  19
  20 function isDateValid (value: string) {
  21   return exists(value) && validator.isISO8601(value)
  22 }
  23
  24 function isIdValid (value: string) {
  25   return exists(value) && validator.isInt('' + value)
  26 }
  27
  28 function isUUIDValid (value: string) {
  29   return exists(value) && validator.isUUID('' + value, 4)
  30 }
  31
  32 function isIdOrUUIDValid (value: string) {
  33   return isIdValid(value) || isUUIDValid(value)
  34 }
  35
  36 function isBooleanValid (value: any) {
  37   return typeof value === 'boolean' || (typeof value === 'string' && validator.isBoolean(value))
  38 }
  39
  40 function toIntOrNull (value: string) {
  41   if (value === 'null') return null
  42
  43   return validator.toInt(value)
  44 }
  45
  46 function toValueOrNull (value: string) {
  47   if (value === 'null') return null
  48
  49   return value
  50 }
  51
  52 function toArray (value: any) {
  53   if (value && isArray(value) === false) return [ value ]
  54
  55   return value
  56 }
  57
  58 function toIntArray (value: any) {
  59   if (!value) return []
  60   if (isArray(value) === false) return [ validator.toInt(value) ]
  61
  62   return value.map(v => validator.toInt(v))
  63 }
  64
  65 function isFileValid (
  66   files: { [ fieldname: string ]: Express.Multer.File[] } | Express.Multer.File[],
  67   mimeTypeRegex: string,
  68   field: string,
  69   maxSize: number | null,
  70   optional = false
  71 ) {
  72   // Should have files
  73   if (!files) return optional
  74   if (isArray(files)) return optional
  75
  76   // Should have a file
  77   const fileArray = files[ field ]
  78   if (!fileArray || fileArray.length === 0) {
  79     return optional
  80   }
  81
  82   // The file should exist
  83   const file = fileArray[ 0 ]
  84   if (!file || !file.originalname) return false
  85
  86   // Check size
  87   if ((maxSize !== null) && file.size > maxSize) return false
  88
  89   return new RegExp(`^${mimeTypeRegex}$`, 'i').test(file.mimetype)
  90 }
  91
  92 // ---------------------------------------------------------------------------
  93
  94 export {
  95   exists,
  96   isArrayOf,
  97   isNotEmptyIntArray,
  98   isArray,
  99   isIdValid,
 100   isUUIDValid,
 101   isIdOrUUIDValid,
 102   isDateValid,
 103   toValueOrNull,
 104   isBooleanValid,
 105   toIntOrNull,
 106   toArray,
 107   toIntArray,
 108   isFileValid
 109 }