Add SMTP adapter

src/Utopia/Messaging/Adapter/Email/SMTP.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace Utopia\Messaging\Adapter\Email;
+
+use PHPMailer\PHPMailer\PHPMailer;
+use Utopia\Messaging\Adapter\Email as EmailAdapter;
+use Utopia\Messaging\Messages\Email as EmailMessage;
+use Utopia\Messaging\Response;
+
+class SMTP extends EmailAdapter
+{
+    protected const NAME = 'SMTP';
+
+    /**
+     * @param string $host SMTP hosts. Either a single hostname or multiple semicolon-delimited hostnames. You can also specify a different port for each host by using this format: [hostname:port] (e.g. "smtp1.example.com:25;smtp2.example.com"). You can also specify encryption type, for example: (e.g. "tls://smtp1.example.com:587;ssl://smtp2.example.com:465"). Hosts will be tried in order.
+     * @param int $port The default SMTP server port.
+     * @param string $username Authentication username.
+     * @param string $password Authentication password.
+     * @param string $smtpSecure SMTP Secure prefix. Can be '', 'ssl' or 'tls'
+     * @param bool $smtpAutoTLS Enable/disable SMTP AutoTLS feature. Defaults to false.
+     * @param string $xMailer The value to use for the X-Mailer header.
+     */
+    public function __construct(
+        private string $host,
+        private int $port = 25,
+        private string $username = '',
+        private string $password = '',
+        private string $smtpSecure = '',
+        private bool $smtpAutoTLS = false,
+        private string $xMailer = ''
+    ) {
+        if (!\in_array($this->smtpSecure, ['', 'ssl', 'tls'])) {
+            throw new \InvalidArgumentException('Invalid SMTP secure prefix. Must be "", "ssl" or "tls"');
+        }
+    }
+
+    public function getName(): string
+    {
+        return static::NAME;
+    }
+
+    public function getMaxMessagesPerRequest(): int
+    {
+        return 1000;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function process(EmailMessage $message): array
+    {
+        $response = new Response($this->getType());
+        $mail = new PHPMailer();
+        $mail->isSMTP();
+        $mail->XMailer = $this->xMailer;
+        $mail->Host = $this->host;
+        $mail->Port = $this->port;
+        $mail->SMTPAuth = !empty($this->username) && !empty($this->password);
+        $mail->Username = $this->username;
+        $mail->Password = $this->password;
+        $mail->SMTPSecure = $this->smtpSecure;
+        $mail->SMTPAutoTLS = $this->smtpAutoTLS;
+        $mail->CharSet = 'UTF-8';
+        $mail->Subject = $message->getSubject();
+        $mail->Body = $message->getContent();
+        $mail->setFrom($message->getFromEmail(), $message->getFromName());
+        $mail->addReplyTo($message->getReplyToEmail(), $message->getReplyToName());
+        $mail->isHTML($message->isHtml());
+
+        // Strip tags misses style tags, so we use regex to remove them
+        $mail->AltBody = \preg_replace('/<style\b[^>]*>(.*?)<\/style>/is', '', $mail->Body);
+        $mail->AltBody = \strip_tags($mail->AltBody);
+        $mail->AltBody = \trim($mail->AltBody);
+
+        foreach ($message->getTo() as $to) {
+            $mail->addAddress($to);
+        }
+
+        $sent = $mail->send();
+
+        if ($sent) {
+            $response->setDeliveredTo(\count($message->getTo()));
+        }
+
+        foreach ($message->getTo() as $to) {
+            $response->addResultForRecipient($to, $sent ? '' : $mail->ErrorInfo);
+        }
+
+        return $response->toArray();
+    }
+}