server/helpers/custom-validators/misc.ts

   1 import 'multer'
   2 import * as validator from 'validator'
   3 import { sep } from 'path'
   4
   5 function exists (value: any) {
   6   return value !== undefined && value !== null
   7 }
   8
   9 function isSafePath (p: string) {
  10   return exists(p) &&
  11     (p + '').split(sep).every(part => {
  12       return [ '', '.', '..' ].includes(part) === false
  13     })
  14 }
  15
  16 function isArray (value: any) {
  17   return Array.isArray(value)
  18 }
  19
  20 function isNotEmptyIntArray (value: any) {
  21   return Array.isArray(value) && value.every(v => validator.isInt('' + v)) && value.length !== 0
  22 }
  23
  24 function isArrayOf (value: any, validator: (value: any) => boolean) {
  25   return isArray(value) && value.every(v => validator(v))
  26 }
  27
  28 function isDateValid (value: string) {
  29   return exists(value) && validator.isISO8601(value)
  30 }
  31
  32 function isIdValid (value: string) {
  33   return exists(value) && validator.isInt('' + value)
  34 }
  35
  36 function isUUIDValid (value: string) {
  37   return exists(value) && validator.isUUID('' + value, 4)
  38 }
  39
  40 function isIdOrUUIDValid (value: string) {
  41   return isIdValid(value) || isUUIDValid(value)
  42 }
  43
  44 function isBooleanValid (value: any) {
  45   return typeof value === 'boolean' || (typeof value === 'string' && validator.isBoolean(value))
  46 }
  47
  48 function toIntOrNull (value: string) {
  49   if (value === 'null') return null
  50
  51   return validator.toInt(value)
  52 }
  53
  54 function toValueOrNull (value: string) {
  55   if (value === 'null') return null
  56
  57   return value
  58 }
  59
  60 function toArray (value: any) {
  61   if (value && isArray(value) === false) return [ value ]
  62
  63   return value
  64 }
  65
  66 function toIntArray (value: any) {
  67   if (!value) return []
  68   if (isArray(value) === false) return [ validator.toInt(value) ]
  69
  70   return value.map(v => validator.toInt(v))
  71 }
  72
  73 function isFileValid (
  74   files: { [ fieldname: string ]: Express.Multer.File[] } | Express.Multer.File[],
  75   mimeTypeRegex: string,
  76   field: string,
  77   maxSize: number | null,
  78   optional = false
  79 ) {
  80   // Should have files
  81   if (!files) return optional
  82   if (isArray(files)) return optional
  83
  84   // Should have a file
  85   const fileArray = files[ field ]
  86   if (!fileArray || fileArray.length === 0) {
  87     return optional
  88   }
  89
  90   // The file should exist
  91   const file = fileArray[ 0 ]
  92   if (!file || !file.originalname) return false
  93
  94   // Check size
  95   if ((maxSize !== null) && file.size > maxSize) return false
  96
  97   return new RegExp(`^${mimeTypeRegex}$`, 'i').test(file.mimetype)
  98 }
  99
 100 // ---------------------------------------------------------------------------
 101
 102 export {
 103   exists,
 104   isArrayOf,
 105   isNotEmptyIntArray,
 106   isArray,
 107   isIdValid,
 108   isSafePath,
 109   isUUIDValid,
 110   isIdOrUUIDValid,
 111   isDateValid,
 112   toValueOrNull,
 113   isBooleanValid,
 114   toIntOrNull,
 115   toArray,
 116   toIntArray,
 117   isFileValid
 118 }