5no-schema/src/validators/email.js

JSON Schema Filter/Validator

import { getTypeOfValue, isEqual } from '../helper'

export default function({name, value, defaultValue}) {
  if (typeof value !== 'undefined' &&
        getTypeOfValue(value) === 'string' &&
        !isEqual(value, defaultValue)
  ) {
    if (
      value.length < 254 &&
      /^[-!#$%&'*+\/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-*\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$/.test(value)
    ) {
      const parts = value.split('@')
      const domainParts = parts[1].split('.')

      if (parts[0].length < 64 && !domainParts.some(part => part.length > 63)) {
        return true
      }
    }

    return `${name} has incorrect email format`
  }

  return true
}