Implemented mailing abstraction

Closes #434

5 files changed, 347 insertions, 0 deletions

diff --git a/src/Mail/EngelsystemMailer.php b/src/Mail/EngelsystemMailer.php
new file mode 100644
index 00000000..17047cc8
--- /dev/null
+++ b/src/Mail/EngelsystemMailer.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Engelsystem\Mail;
+
+use Engelsystem\Renderer\Renderer;
+use Swift_Mailer as SwiftMailer;
+
+class EngelsystemMailer extends Mailer
+{
+    /** @var Renderer|null */
+    protected $view;
+
+    public function __construct(SwiftMailer $mailer, Renderer $view = null)
+    {
+        parent::__construct($mailer);
+
+        $this->view = $view;
+    }
+
+    /**
+     * Send a template
+     *
+     * @param string $to
+     * @param string $subject
+     * @param string $template
+     * @param array  $data
+     * @return int
+     */
+    public function sendView($to, $subject, $template, $data = []): int
+    {
+        $body = $this->view->render($template, $data);
+
+        return $this->send($to, $subject, $body);
+    }
+}
diff --git a/src/Mail/Mailer.php b/src/Mail/Mailer.php
new file mode 100644
index 00000000..ed800986
--- /dev/null
+++ b/src/Mail/Mailer.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace Engelsystem\Mail;
+
+use Engelsystem\Renderer\Renderer;
+use Swift_Mailer as SwiftMailer;
+use Swift_Message as SwiftMessage;
+
+class Mailer
+{
+    /** @var SwiftMailer */
+    protected $mailer;
+
+    /** @var Renderer|null */
+    protected $view;
+
+    /** @var string */
+    protected $fromAddress = '';
+
+    /** @var string */
+    protected $fromName = null;
+
+    public function __construct(SwiftMailer $mailer)
+    {
+        $this->mailer = $mailer;
+    }
+
+    /**
+     * Send the mail
+     *
+     * @param string|string[] $to
+     * @param string          $subject
+     * @param string          $body
+     * @return int
+     */
+    public function send($to, string $subject, string $body): int
+    {
+        /** @var SwiftMessage $message */
+        $message = $this->mailer->createMessage();
+        $message->setTo((array)$to)
+            ->setFrom($this->fromAddress, $this->fromName)
+            ->setSubject($subject)
+            ->setBody($body);
+
+        return $this->mailer->send($message);
+    }
+
+    /**
+     * @return string
+     */
+    public function getFromAddress(): string
+    {
+        return $this->fromAddress;
+    }
+
+    /**
+     * @param string $fromAddress
+     */
+    public function setFromAddress(string $fromAddress)
+    {
+        $this->fromAddress = $fromAddress;
+    }
+
+    /**
+     * @return string
+     */
+    public function getFromName(): string
+    {
+        return $this->fromName;
+    }
+
+    /**
+     * @param string $fromName
+     */
+    public function setFromName(string $fromName)
+    {
+        $this->fromName = $fromName;
+    }
+}
diff --git a/src/Mail/MailerServiceProvider.php b/src/Mail/MailerServiceProvider.php
new file mode 100644
index 00000000..70cb0d30
--- /dev/null
+++ b/src/Mail/MailerServiceProvider.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Engelsystem\Mail;
+
+use Engelsystem\Config\Config;
+use Engelsystem\Container\ServiceProvider;
+use Engelsystem\Mail\Transport\LogTransport;
+use InvalidArgumentException;
+use Swift_Mailer as SwiftMailer;
+use Swift_SendmailTransport as SendmailTransport;
+use Swift_SmtpTransport as SmtpTransport;
+use Swift_Transport as Transport;
+
+class MailerServiceProvider extends ServiceProvider
+{
+    public function register()
+    {
+        /** @var Config $config */
+        $config = $this->app->get('config');
+        $mailConfig = $config->get('email');
+
+        $transport = $this->getTransport($mailConfig['driver'], $mailConfig);
+        $this->app->instance(Transport::class, $transport);
+        $this->app->instance('mailer.transport', $transport);
+
+        /** @var SwiftMailer $swiftMailer */
+        $swiftMailer = $this->app->make(SwiftMailer::class);
+        $this->app->instance(SwiftMailer::class, $swiftMailer);
+        $this->app->instance('mailer.swift', $swiftMailer);
+
+        /** @var Mailer $mailer */
+        $mailer = $this->app->make(EngelsystemMailer::class);
+        $mailer->setFromAddress($mailConfig['from']['address']);
+        if (!empty($mailConfig['from']['name'])) {
+            $mailer->setFromName($mailConfig['from']['name']);
+        }
+
+        $this->app->instance(EngelsystemMailer::class, $mailer);
+        $this->app->instance(Mailer::class, $mailer);
+        $this->app->instance('mailer', $mailer);
+    }
+
+    /**
+     * @param string $transport
+     * @param array  $config
+     * @return Transport
+     */
+    protected function getTransport($transport, $config)
+    {
+        switch ($transport) {
+            case 'log':
+                return $this->app->make(LogTransport::class);
+            case 'mail':
+            case 'sendmail':
+                return $this->app->make(SendmailTransport::class, ['command' => $config['sendmail']]);
+            case 'smtp':
+                return $this->getSmtpTransport($config);
+        }
+
+        throw new InvalidArgumentException(sprintf('Mail driver "%s" not found', $transport));
+    }
+
+    /**
+     * @param array $config
+     * @return SmtpTransport
+     */
+    protected function getSmtpTransport(array $config)
+    {
+        /** @var SmtpTransport $transport */
+        $transport = $this->app->make(SmtpTransport::class, [
+            'host'     => $config['host'],
+            'port'     => $config['port'],
+            'security' => $config['encryption'],
+        ]);
+
+        if ($config['username']) {
+            $transport->setUsername($config['username']);
+        }
+
+        if ($config['password']) {
+            $transport->setPassword($config['password']);
+        }
+
+        return $transport;
+    }
+}
diff --git a/src/Mail/Transport/LogTransport.php b/src/Mail/Transport/LogTransport.php
new file mode 100644
index 00000000..6e351302
--- /dev/null
+++ b/src/Mail/Transport/LogTransport.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Engelsystem\Mail\Transport;
+
+use Psr\Log\LoggerInterface;
+use Swift_Mime_SimpleMessage as SimpleMessage;
+
+class LogTransport extends Transport
+{
+    /** @var LoggerInterface */
+    protected $logger;
+
+    public function __construct(LoggerInterface $logger)
+    {
+        $this->logger = $logger;
+    }
+
+    /**
+     * Send the given Message.
+     *
+     * Recipient/sender data will be retrieved from the Message API.
+     * The return value is the number of recipients
+     *
+     * @param SimpleMessage $message
+     * @param string[]      $failedRecipients An array of failures by-reference
+     *
+     * @return int
+     */
+    public function send(
+        SimpleMessage $message,
+        &$failedRecipients = null
+    ): int {
+        $this->logger->debug(
+            'Mail: Send mail "{title}" to "{recipients}":' . PHP_EOL . '{content}',
+            [
+                'title'      => $message->getSubject(),
+                'recipients' => $this->getTo($message),
+                'content'    => (string)$message->getHeaders() . PHP_EOL . PHP_EOL . $message->toString(),
+            ]
+        );
+
+        return count($this->allRecipients($message));
+    }
+}
diff --git a/src/Mail/Transport/Transport.php b/src/Mail/Transport/Transport.php
new file mode 100644
index 00000000..691faf60
--- /dev/null
+++ b/src/Mail/Transport/Transport.php
@@ -0,0 +1,103 @@
+<?php
+
+namespace Engelsystem\Mail\Transport;
+
+use Swift_Events_EventListener;
+use Swift_Mime_SimpleMessage as SimpleMessage;
+use Swift_Transport as SwiftTransport;
+
+abstract class Transport implements SwiftTransport
+{
+    /**
+     * Test if this Transport mechanism has started.
+     *
+     * @return bool
+     */
+    public function isStarted(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Start this Transport mechanism.
+     */
+    public function start() { }
+
+    /**
+     * Stop this Transport mechanism.
+     */
+    public function stop() { }
+
+    /**
+     * Check if this Transport mechanism is alive.
+     *
+     * If a Transport mechanism session is no longer functional, the method
+     * returns FALSE. It is the responsibility of the developer to handle this
+     * case and restart the Transport mechanism manually.
+     *
+     * @example
+     *
+     *   if (!$transport->ping()) {
+     *      $transport->stop();
+     *      $transport->start();
+     *   }
+     *
+     * The Transport mechanism will be started, if it is not already.
+     *
+     * It is undefined if the Transport mechanism attempts to restart as long as
+     * the return value reflects whether the mechanism is now functional.
+     *
+     * @return bool TRUE if the transport is alive
+     */
+    public function ping(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Register a plugin in the Transport.
+     *
+     * @param Swift_Events_EventListener $plugin
+     */
+    public function registerPlugin(Swift_Events_EventListener $plugin) { }
+
+    /**
+     * Returns a unified list of all recipients
+     *
+     * @param SimpleMessage $message
+     * @return array
+     */
+    protected function allRecipients(SimpleMessage $message): array
+    {
+        return array_merge(
+            (array)$message->getTo(),
+            (array)$message->getCc(),
+            (array)$message->getBcc()
+        );
+    }
+
+    /**
+     * Returns a concatenated list of mail recipients
+     *
+     * @param  SimpleMessage $message
+     * @return string
+     */
+    protected function getTo(SimpleMessage $message): string
+    {
+        return $this->formatTo($this->allRecipients($message));
+    }
+
+    /**
+     * @param array $recipients
+     * @return string
+     */
+    protected function formatTo(array $recipients)
+    {
+        $list = [];
+        foreach ($recipients as $address => $name) {
+            $list[] = $name ? sprintf('%s <%s>', $name, $address) : $address;
+        }
+
+        return implode(',', $list);
+    }
+}