- Adds ElasticEmail and SendGrid mailer classes + tests

lib/Mailer/SendGrid.php

@@ -0,0 +1,64 @@
+<?php
+namespace MailPoet\Mailer;
+
+if(!defined('ABSPATH')) exit;
+
+class SendGrid {
+  function __construct($api_key, $from_email, $from_name, $newsletter, $subscribers) {
+    $this->url = 'https://api.sendgrid.com/api/mail.send.json';
+    $this->api_key = $api_key;
+    $this->newsletter = $newsletter;
+    $this->subscribers = $subscribers;
+    $this->from_name = $from_name;
+    $this->from_email = $from_email;
+  }
+
+  function send() {
+    if (!count($this->getSubscribers())) return false;
+    $result = wp_remote_post(
+      $this->url,
+      $this->request()
+    );
+    $result = json_decode($result['body'], true);
+    return (isset($result['errors']) === false);
+  }
+
+  function getSubscribers() {
+    $subscribers = array_map(function ($subscriber) {
+      if(!isset($subscriber['email'])) return;
+      $first_name = (isset($subscriber['first_name'])) ? $subscriber['first_name'] : '';
+      $last_name = (isset($subscriber['last_name'])) ? $subscriber['last_name'] : '';
+      $subscriber = sprintf('%s %s <%s>', $first_name, $last_name, $subscriber['email']);
+      $subscriber = trim(preg_replace('!\s\s+!', ' ', $subscriber));
+      return $subscriber;
+    }, $this->subscribers);
+    return array_filter($subscribers);
+  }
+
+  function getBody() {
+    $parameters = array(
+      'from' => sprintf('%s <%s>', $this->from_name, $this->from_email),
+      'x-smtpapi' => json_encode(array('to' => $this->getSubscribers())),
+      'to' => $this->from_email,
+      'subject' => $this->newsletter['subject'],
+      'html' => $this->newsletter['body']
+    );
+    $body = array_map(function ($parameter, $value) {
+      return $parameter . '=' . urlencode($value);
+    }, array_keys($parameters), $parameters);
+    return implode('&', array_filter($body));
+  }
+
+  function request() {
+    return array(
+      'timeout' => 10,
+      'httpversion' => '1.1',
+      'method' => 'POST',
+      'headers' => array(
+        'Authorization' => 'Bearer ' . $this->api_key,
+        'Content-Type' => 'application/x-www-form-urlencoded'
+      ),
+      'body' => $this->getBody()
+    );
+  }
+}