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