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 isDateValid (value: string) {
  13   return exists(value) && validator.isISO8601(value)
  14 }
  15
  16 function isIdValid (value: string) {
  17   return exists(value) && validator.isInt('' + value)
  18 }
  19
  20 function isUUIDValid (value: string) {
  21   return exists(value) && validator.isUUID('' + value, 4)
  22 }
  23
  24 function isIdOrUUIDValid (value: string) {
  25   return isIdValid(value) || isUUIDValid(value)
  26 }
  27
  28 function isBooleanValid (value: any) {
  29   return typeof value === 'boolean' || (typeof value === 'string' && validator.isBoolean(value))
  30 }
  31
  32 function toIntOrNull (value: string) {
  33   if (value === 'null') return null
  34
  35   return validator.toInt(value)
  36 }
  37
  38 function toValueOrNull (value: string) {
  39   if (value === 'null') return null
  40
  41   return value
  42 }
  43
  44 function toArray (value: string) {
  45   if (value && isArray(value) === false) return [ value ]
  46
  47   return value
  48 }
  49
  50 function isFileValid (
  51   files: { [ fieldname: string ]: Express.Multer.File[] } | Express.Multer.File[],
  52   mimeTypeRegex: string,
  53   field: string,
  54   maxSize: number | null,
  55   optional = false
  56 ) {
  57   // Should have files
  58   if (!files) return optional
  59   if (isArray(files)) return optional
  60
  61   // Should have a file
  62   const fileArray = files[ field ]
  63   if (!fileArray || fileArray.length === 0) {
  64     return optional
  65   }
  66
  67   // The file should exist
  68   const file = fileArray[ 0 ]
  69   if (!file || !file.originalname) return false
  70
  71   // Check size
  72   if ((maxSize !== null) && file.size > maxSize) return false
  73
  74   return new RegExp(`^${mimeTypeRegex}$`, 'i').test(file.mimetype)
  75 }
  76
  77 // ---------------------------------------------------------------------------
  78
  79 export {
  80   exists,
  81   isArray,
  82   isIdValid,
  83   isUUIDValid,
  84   isIdOrUUIDValid,
  85   isDateValid,
  86   toValueOrNull,
  87   isBooleanValid,
  88   toIntOrNull,
  89   toArray,
  90   isFileValid
  91 }