added card type detector

src/main/php/com-realexpayments-remote-sdk/utils/CardTypeDetector.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace com\realexpayments\remote\sdk\utils;
+
+
+use com\realexpayments\remote\sdk\domain\CardType;
+
+class CardTypeDetector
+{
+    private function isVisa(string $card) : bool
+    {
+        return preg_match("/^4[0-9]{0,15}$/i", $card);
+    }
+    private function isMasterCard(string $card) :  bool
+    {
+        return preg_match("/^5[1-5][0-9]{5,}|222[1-9][0-9]{3,}|22[3-9][0-9]{4,}|2[3-6][0-9]{5,}|27[01][0-9]{4,}|2720[0-9]{3,}$/i", $card);
+    }
+    private function isAmex(string $card) : bool
+    {
+        return preg_match("/^3$|^3[47][0-9]{0,13}$/i", $card);
+    }
+    private function isDiscover(string $card) : bool
+    {
+        return preg_match("/^6$|^6[05]$|^601[1]?$|^65[0-9][0-9]?$|^6(?:011|5[0-9]{2})[0-9]{0,12}$/i", $card);
+    }
+    private function isJCB(string $card) : bool
+    {
+        return preg_match("/^(?:2131|1800|35[0-9]{3})[0-9]{3,}$/i", $card);
+    }
+    private function isDinersClub(string $card) : bool
+    {
+        return preg_match("/^3(?:0[0-5]|[68][0-9])[0-9]{4,}$/i", $card);
+    }
+    public static function detect(string $card) : string
+    {
+        $cardTypes = [
+            [
+                'code' => CardType::VISA,
+                'methodName' => 'isVisa'
+            ],
+            [
+                'code' => CardType::MASTERCARD,
+                'methodName' => 'isMasterCard'
+            ],
+            [
+                'code' => CardType::AMEX,
+                'methodName' => 'isAmex'
+            ],
+            [
+                'code' => CardType::CB,
+                'methodName' => 'isDiscover'
+            ],
+            [
+                'code' => CardType::JCB,
+                'methodName' => 'isJCB'
+            ],
+            [
+                'code' => CardType::DINERS,
+                'methodName' => 'isDinersClub'
+            ]
+        ];
+        foreach ($cardTypes as $cardType) {
+            $method = $cardType['methodName'];
+            if (self::$method($card)) {
+                return $cardType['code'];
+            }
+        }
+        return 'Invalid Card';
+    }
+
+}