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: string) {
  53   if (value && isArray(value) === false) return [ value ]
  54
  55   return value
  56 }
  57
  58 function isFileValid (
  59   files: { [ fieldname: string ]: Express.Multer.File[] } | Express.Multer.File[],
  60   mimeTypeRegex: string,
  61   field: string,
  62   maxSize: number | null,
  63   optional = false
  64 ) {
  65   // Should have files
  66   if (!files) return optional
  67   if (isArray(files)) return optional
  68
  69   // Should have a file
  70   const fileArray = files[ field ]
  71   if (!fileArray || fileArray.length === 0) {
  72     return optional
  73   }
  74
  75   // The file should exist
  76   const file = fileArray[ 0 ]
  77   if (!file || !file.originalname) return false
  78
  79   // Check size
  80   if ((maxSize !== null) && file.size > maxSize) return false
  81
  82   return new RegExp(`^${mimeTypeRegex}$`, 'i').test(file.mimetype)
  83 }
  84
  85 // ---------------------------------------------------------------------------
  86
  87 export {
  88   exists,
  89   isArrayOf,
  90   isNotEmptyIntArray,
  91   isArray,
  92   isIdValid,
  93   isUUIDValid,
  94   isIdOrUUIDValid,
  95   isDateValid,
  96   toValueOrNull,
  97   isBooleanValid,
  98   toIntOrNull,
  99   toArray,
 100   isFileValid
 101 }