- Refactors Mailer class

- Refactors SendingQueue worker class
- Adds Maier router with a send() method + ability to specify sending method
- Updates tests
- Introduces 'stopping' and 'starting' cron states
- Improves cron control mechanism
Closes #276

lib/Mailer/Methods/SMTP.php

@@ -0,0 +1,69 @@
+<?php
+namespace MailPoet\Mailer\Methods;
+
+if(!defined('ABSPATH')) exit;
+
+class SMTP {
+  function __construct($host, $port, $authentication, $login = null, $password = null, $encryption,
+    $fromEmail, $fromName) {
+    $this->host = $host;
+    $this->port = $port;
+    $this->authentication = $authentication;
+    $this->login = $login;
+    $this->password = $password;
+    $this->encryption = $encryption;
+    $this->fromName = $fromName;
+    $this->fromEmail = $fromEmail;
+    $this->mailer = $this->buildMailer();
+  }
+
+  function send($newsletter, $subscriber) {
+    try {
+      $message = $this->createMessage($newsletter, $subscriber);
+      $result = $this->mailer->send($message);
+    } catch(\Exception $e) {
+      $result = false;
+    }
+    return ($result === 1);
+  }
+
+  function buildMailer() {
+    $transport = \Swift_SmtpTransport::newInstance(
+      $this->host, $this->port, $this->encryption);
+    $transport->setTimeout(10);
+    if($this->authentication) {
+      $transport
+        ->setUsername($this->login)
+        ->setPassword($this->password);
+    }
+    return \Swift_Mailer::newInstance($transport);
+  }
+
+
+  function createMessage($newsletter, $subscriber) {
+    $message = \Swift_Message::newInstance()
+      ->setFrom(array($this->fromEmail => $this->fromName))
+      ->setTo($this->processSubscriber($subscriber))
+      ->setSubject($newsletter['subject']);
+    if(!empty($newsletter['body']['html'])) {
+      $message = $message->setBody($newsletter['body']['html'], 'text/html');
+    }
+    if(!empty($newsletter['body']['text'])) {
+      $message = $message->addPart($newsletter['body']['text'], 'text/plain');
+    }
+    return $message;
+  }
+
+  function processSubscriber($subscriber) {
+    preg_match('!(?P<name>.*?)\s<(?P<email>.*?)>!', $subscriber, $subscriberData);
+    if(!isset($subscriberData['email'])) {
+      $subscriberData = array(
+        'email' => $subscriber,
+      );
+    }
+    return array(
+      $subscriberData['email'] =>
+        (isset($subscriberData['name'])) ? $subscriberData['name'] : ''
+    );
+  }
+}