From 6e80eb984c973fb5675a8ad143a68ae9254469fa Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 15 Mar 2015 22:04:19 -0400
Subject: Epirts.card.validateCardNumber(): Implement

---
diff --git a/epirts.js b/epirts.js
index 7053626..9a538af 100644
--- a/epirts.js
+++ b/epirts.js
@@ -42,6 +42,23 @@ var Stripe = Epirts = (function() {
 		};
 
 		pub.validateCardNumber = function(number) {
+			number = (number + '').replace(/\s|-/g);
+			if (number.match(/\D/)) {
+				return false;
+			} else if (number.length < 13 || number.length > 16) {
+				/* Card number lengths:
+				 *   * VISA: 13 or 16
+				 *   * MasterCard: 16
+				 *   * American Express: 15
+				 *   * JCB: 16
+				 *   * Discover: 16
+				 *   * Diners Club: 14-16
+				 */
+				return false;
+			} else if (!pub.luhnCheck(number)) {
+				return false;
+			}
+			return true;
 		};
 
 		pub.luhnCheck = function(number) {
--
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