PHP Twig Mailer

ExampleMailer.php

<?php
final class ExampleMailer extends Mailer
{
    protected $parameters;

    public function __construct(\Swift_Mailer $mailer, UrlGeneratorInterface $router, \Twig_Environment $twig, array $parameters)
    {
        parent::__construct($mailer, $router, $twig);

        $this->parameters = $parameters;
    }

    /**
     * {@inheritdoc}
     */
    public function sendMemberInviteMessage(MemberInvite $invite)
    {
        $template = $this->parameters['template']['member_invite_verification'];
        $url = $this->getUrlGenerator()->generate(
            'xoip_profile_company_member_invite_verification',
            [
                'company' => $invite->getCompany(),
                'memberInvite' => $invite->getConfirmationToken()
            ],
            true
        );

        $context = [
            'email' => $invite->getEmail(),
            'name' => $invite->getEmail(),
            'company' => $invite->getCompany(),
            'confirmationUrl' => $url,
        ];

        $this->sendMessage($template, $context, $this->parameters['from_email']['member_invite_verification'], $invite->getEmail());
    }
}

Mailer.php

<?php

use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

abstract class Mailer
{
    /**
     * @var \Swift_Mailer
     */
    private $mailer;

    /**
     * @var UrlGeneratorInterface
     */
    private $router;

    /**
     * @var \Twig_Environment
     */
    private $twig;

    public function __construct(\Swift_Mailer $mailer, UrlGeneratorInterface $router, \Twig_Environment $twig)
    {
        $this->mailer = $mailer;
        $this->router = $router;
        $this->twig = $twig;
    }

    protected function getUrlGenerator()
    {
        return $this->router;
    }

    /**
     * @param string $templateName
     * @param array $context
     * @param string $fromEmail
     * @param string $toEmail
     * @param array $attachments
     */
    protected function sendMessage($templateName, array $context, $fromEmail, $toEmail, array $attachments = [])
    {
        $context = $this->twig->mergeGlobals($context);

        /** @var \Twig_Template $template */
        $template = $this->twig->loadTemplate($templateName);
        $subject = $template->renderBlock('subject', $context);
        $textBody = $template->renderBlock('body_text', $context);
        $htmlBody = $template->renderBlock('body_html', $context);

        $message = \Swift_Message::newInstance();
        $message->setSubject($subject)
            ->setFrom($fromEmail)
            ->setTo($toEmail);

        if (!empty($htmlBody)) {
            $message->setBody($htmlBody, 'text/html');
            $message->addPart($textBody, 'text/plain');
        } else {
            $message->setBody($textBody);
        }

        foreach ($attachments as $name => $filePath) {
            $fileName = $name.'.'.pathinfo($filePath, PATHINFO_EXTENSION);

            $message->attach(
                \Swift_Attachment::fromPath($filePath)
                    ->setFilename($fileName)
            );
        }

        $this->mailer->send($message);
    }
}