- Adds Amazon SES tests

- Refactors all API mailers
- Updates unit tests for all API mailers
- Adds Mailer router + tests

lib/Mailer/API/ElasticEmail.php

@@ -0,0 +1,45 @@
+<?php
+namespace MailPoet\Mailer\API;
+
+if(!defined('ABSPATH')) exit;
+
+class ElasticEmail {
+  function __construct($api_key, $from_email, $from_name) {
+    $this->url = 'https://api.elasticemail.com/mailer/send';
+    $this->api_key = $api_key;
+    $this->from_name = $from_name;
+    $this->from_email = $from_email;
+  }
+
+  function send($newsletter, $subscriber) {
+    $this->newsletter = $newsletter;
+    $this->subscriber = $subscriber;
+    $result = wp_remote_post(
+      $this->url,
+      $this->request());
+    if(is_object($result) && get_class($result) === 'WP_Error') return false;
+    return (!preg_match('/\w{8}-\w{4}-\w{4}-\w{4}-\w{12}/', $result['body']) === false);
+  }
+
+  function getBody() {
+    $parameters = array(
+      'api_key' => $this->api_key,
+      'from' => $this->from_email,
+      'from_name' => $this->from_name,
+      'to' => $this->subscriber,
+      'subject' => $this->newsletter['subject'],
+      'body_html' => $this->newsletter['body']['html'],
+      'body_text' => $this->newsletter['body']['text']
+    );
+    return urldecode(http_build_query($parameters));
+  }
+
+  function request() {
+    return array(
+      'timeout' => 10,
+      'httpversion' => '1.0',
+      'method' => 'POST',
+      'body' => $this->getBody()
+    );
+  }
+}