Refactor confirmation email sending

Aspect mock stopped working for me so I had to create a separate service
for sending confirmation emails.

[MAILPOET-1522]

lib/Subscribers/SendConfirmationEmail.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace MailPoet\Subscribers;
+
+use MailPoet\Mailer\Mailer;
+use MailPoet\Models\Setting;
+use MailPoet\Models\Subscriber;
+use MailPoet\Subscription\Url;
+use MailPoet\Util\Helpers;
+
+class SendConfirmationEmail {
+
+  /** @var Mailer */
+  private $mailer;
+
+  /**
+   * @param Mailer|null $mailer
+   */
+  function __construct($mailer = null) {
+    if($mailer) {
+      $this->mailer = $mailer;
+    }
+  }
+
+  function sendConfirmationEmail(Subscriber $subscriber) {
+    $signup_confirmation = Setting::getValue('signup_confirmation');
+
+    if((bool)$signup_confirmation['enabled'] === false) {
+      return false;
+    }
+
+    $segments = $subscriber->segments()->findMany();
+    $segment_names = array_map(function($segment) {
+      return $segment->name;
+    }, $segments);
+
+    $body = nl2br($signup_confirmation['body']);
+
+    // replace list of segments shortcode
+    $body = str_replace(
+      '[lists_to_confirm]',
+      '<strong>'.join(', ', $segment_names).'</strong>',
+      $body
+    );
+
+    // replace activation link
+    $body = Helpers::replaceLinkTags(
+      $body,
+      Url::getConfirmationUrl($subscriber),
+      array('target' => '_blank'),
+      'activation_link'
+    );
+
+    // build email data
+    $email = array(
+      'subject' => $signup_confirmation['subject'],
+      'body' => array(
+        'html' => $body,
+        'text' => $body
+      )
+    );
+
+    // set from
+    $from = (
+      !empty($signup_confirmation['from'])
+      && !empty($signup_confirmation['from']['address'])
+    ) ? $signup_confirmation['from']
+      : false;
+
+    // set reply to
+    $reply_to = (
+      !empty($signup_confirmation['reply_to'])
+      && !empty($signup_confirmation['reply_to']['address'])
+    ) ? $signup_confirmation['reply_to']
+      : false;
+
+    // send email
+    try {
+      if(!$this->mailer) {
+        $this->mailer = new Mailer(false, $from, $reply_to);
+      }
+      $this->mailer->getSenderNameAndAddress($from);
+      $this->mailer->getReplyToNameAndAddress($reply_to);
+      return $this->mailer->send($email, $subscriber);
+    } catch(\Exception $e) {
+      $subscriber->setError($e->getMessage());
+      return false;
+    }
+  }
+
+}