Implemented postal code validation for the validaton function

ref #105

src/models/entities/Address.ts

@@ -5,6 +5,7 @@ import {
   IsString
 } from "class-validator";
 import { Column } from "typeorm";
+import ValidatorJS from 'validator';
 import { config } from '../../config';
 
 /**
@@ -62,6 +63,7 @@ export class Address {
   public static isValidAddress(address: Address): Boolean {
     if (address == null) { return false; }
     if (address.address1 == null || address.city == null || address.country == null || address.postalcode == null) { return false; }
+    if (ValidatorJS.isPostalCode(address.postalcode, config.postalcode_validation_countrycode) == false) { return false; }
     return true;
   }
 }