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 isFileValid (
  45   files: { [ fieldname: string ]: Express.Multer.File[] } | Express.Multer.File[],
  46   mimeTypeRegex: string,
  47   field: string,
  48   maxSize: number,
  49   optional = false
  50 ) {
  51   // Should have files
  52   if (!files) return optional
  53   if (isArray(files)) return optional
  54
  55   // Should have a file
  56   const fileArray = files[ field ]
  57   if (!fileArray || fileArray.length === 0) {
  58     return optional
  59   }
  60
  61   // The file should exist
  62   const file = fileArray[ 0 ]
  63   if (!file || !file.originalname) return false
  64
  65   // Check size
  66   if (maxSize && file.size > maxSize) return false
  67
  68   return new RegExp(`^${mimeTypeRegex}$`, 'i').test(file.mimetype)
  69 }
  70
  71 // ---------------------------------------------------------------------------
  72
  73 export {
  74   exists,
  75   isArray,
  76   isIdValid,
  77   isUUIDValid,
  78   isIdOrUUIDValid,
  79   isDateValid,
  80   toValueOrNull,
  81   isBooleanValid,
  82   toIntOrNull,
  83   isFileValid
  84 }