server/helpers/custom-validators/misc.ts

   1 import 'multer'
   2 import 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   const v = toValueOrNull(value)
  50
  51   if (v === null || v === undefined) return v
  52   if (typeof v === 'number') return v
  53
  54   return validator.toInt('' + v)
  55 }
  56
  57 function toBooleanOrNull (value: any) {
  58   const v = toValueOrNull(value)
  59
  60   if (v === null || v === undefined) return v
  61   if (typeof v === 'boolean') return v
  62
  63   return validator.toBoolean('' + v)
  64 }
  65
  66 function toValueOrNull (value: string) {
  67   if (value === 'null') return null
  68
  69   return value
  70 }
  71
  72 function toArray (value: any) {
  73   if (value && isArray(value) === false) return [ value ]
  74
  75   return value
  76 }
  77
  78 function toIntArray (value: any) {
  79   if (!value) return []
  80   if (isArray(value) === false) return [ validator.toInt(value) ]
  81
  82   return value.map(v => validator.toInt(v))
  83 }
  84
  85 function isFileValid (
  86   files: { [ fieldname: string ]: Express.Multer.File[] } | Express.Multer.File[],
  87   mimeTypeRegex: string,
  88   field: string,
  89   maxSize: number | null,
  90   optional = false
  91 ) {
  92   // Should have files
  93   if (!files) return optional
  94   if (isArray(files)) return optional
  95
  96   // Should have a file
  97   const fileArray = files[field]
  98   if (!fileArray || fileArray.length === 0) {
  99     return optional
 100   }
 101
 102   // The file should exist
 103   const file = fileArray[0]
 104   if (!file || !file.originalname) return false
 105
 106   // Check size
 107   if ((maxSize !== null) && file.size > maxSize) return false
 108
 109   return new RegExp(`^${mimeTypeRegex}$`, 'i').test(file.mimetype)
 110 }
 111
 112 // ---------------------------------------------------------------------------
 113
 114 export {
 115   exists,
 116   isArrayOf,
 117   isNotEmptyIntArray,
 118   isArray,
 119   isIdValid,
 120   isSafePath,
 121   isUUIDValid,
 122   isIdOrUUIDValid,
 123   isDateValid,
 124   toValueOrNull,
 125   toBooleanOrNull,
 126   isBooleanValid,
 127   toIntOrNull,
 128   toArray,
 129   toIntArray,
 130   isFileValid
 131 }