feat(Subscriptions): Support AwsSNS for subscriptions

Closes #282

src/Model/Subscription/SNSDestination.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * @author @jayS-de <jens.schulze@commercetools.de>
+ */
+
+namespace Commercetools\Core\Model\Subscription;
+
+use Commercetools\Core\Model\Common\Context;
+
+/**
+ * @package Commercetools\Core\Model\Subscription
+ *
+ * @method string getType()
+ * @method SNSDestination setType(string $type = null)
+ * @method string getTopicArn()
+ * @method SNSDestination setTopicArn(string $topicArn = null)
+ * @method string getAccessKey()
+ * @method SNSDestination setAccessKey(string $accessKey = null)
+ * @method string getAccessSecret()
+ * @method SNSDestination setAccessSecret(string $accessSecret = null)
+ */
+class SNSDestination extends Destination
+{
+    public function fieldDefinitions()
+    {
+        return [
+            'type' => [static::TYPE => 'string'],
+            'topicArn' => [static::TYPE => 'string'],
+            'accessKey' => [static::TYPE => 'string'],
+            'accessSecret' => [static::TYPE => 'string'],
+        ];
+    }
+
+    /**
+     * @param string $topicArn
+     * @param string $accessKey
+     * @param string $accessSecret
+     * @param Context|null $context
+     * @return SNSDestination
+     */
+    public static function ofTopicArnAccessKeyAndSecret($topicArn, $accessKey, $accessSecret, Context $context = null)
+    {
+        return static::of($context)->setType('SNS')
+            ->setTopicArn($topicArn)->setAccessKey($accessKey)->setAccessSecret($accessSecret);
+    }
+}