- Refactors MailPoet mailer class + tests

- Includes MailPoet mailer inside Mailer router
- Adjusts Newsletter router to work with new MailPoet mailer
- Updates tests for all mailers

lib/Mailer/API/MailPoet.php

@@ -0,0 +1,73 @@
+<?php
+namespace MailPoet\Mailer\API;
+
+if(!defined('ABSPATH')) exit;
+
+class MailPoet {
+  function __construct($apiKey, $fromEmail, $fromName) {
+    $this->url = 'https://bridge.mailpoet.com/api/messages';
+    $this->apiKey = $apiKey;
+    $this->fromEmail = $fromEmail;
+    $this->fromName = $fromName;
+  }
+
+  function send($newsletter, $subscriber) {
+    $this->newsletter = $newsletter;
+    $this->subscriber = $this->processSubscriber($subscriber);
+    $result = wp_remote_post(
+      $this->url,
+      $this->request()
+    );
+    return (
+      !is_wp_error($result) === true &&
+      wp_remote_retrieve_response_code($result) === 201
+    );
+  }
+
+  function processSubscriber($subscriber) {
+    preg_match('!(?P<name>.*?)\s<(?P<email>.*?)>!', $subscriber, $subscriberData);
+    if(!isset($subscriberData['email'])) {
+      $subscriberData = array(
+        'email' => $subscriber,
+      );
+    }
+    return array(
+      'email' => $subscriberData['email'],
+      'name' => (isset($subscriberData['name'])) ? $subscriberData['name'] : ''
+    );
+  }
+
+  function getBody() {
+    return array(
+      'to' => (array(
+        'address' => $this->subscriber['email'],
+        'name' => $this->subscriber['name']
+      )),
+      'from' => (array(
+        'address' => $this->fromEmail,
+        'name' => $this->fromName
+      )),
+      'subject' => $this->newsletter['subject'],
+      'html' => $this->newsletter['body']['html'],
+      'text' => $this->newsletter['body']['text']
+    );
+  }
+
+  function auth() {
+    return 'Basic ' . base64_encode('api:' . $this->apiKey);
+  }
+
+  function request() {
+    $request = array(
+      'timeout' => 10,
+      'httpversion' => '1.0',
+      'method' => 'POST',
+      'headers' => array(
+        'Content-Type' => 'application/json',
+        'Authorization' => $this->auth()
+      ),
+      'body' => json_encode(array($this->getBody()))
+    );
+    return $request;
+  }
+}