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Filename : Transports.php
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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Mailer\Transport;

use Symfony\Component\Mailer\Envelope;
use Symfony\Component\Mailer\Exception\InvalidArgumentException;
use Symfony\Component\Mailer\Exception\LogicException;
use Symfony\Component\Mailer\SentMessage;
use Symfony\Component\Mime\Message;
use Symfony\Component\Mime\RawMessage;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 */
final class Transports implements TransportInterface
{
    /**
     * @var array<string, TransportInterface>
     */
    private array $transports = [];
    private TransportInterface $default;

    /**
     * @param iterable<string, TransportInterface> $transports
     */
    public function __construct(iterable $transports)
    {
        foreach ($transports as $name => $transport) {
            $this->default ??= $transport;
            $this->transports[$name] = $transport;
        }

        if (!$this->transports) {
            throw new LogicException(sprintf('"%s" must have at least one transport configured.', __CLASS__));
        }
    }

    public function send(RawMessage $message, ?Envelope $envelope = null): ?SentMessage
    {
        /** @var Message $message */
        if (RawMessage::class === $message::class || !$message->getHeaders()->has('X-Transport')) {
            return $this->default->send($message, $envelope);
        }

        $headers = $message->getHeaders();
        $transport = $headers->get('X-Transport')->getBody();
        $headers->remove('X-Transport');

        if (!isset($this->transports[$transport])) {
            throw new InvalidArgumentException(sprintf('The "%s" transport does not exist (available transports: "%s").', $transport, implode('", "', array_keys($this->transports))));
        }

        try {
            return $this->transports[$transport]->send($message, $envelope);
        } catch (\Throwable $e) {
            $headers->addTextHeader('X-Transport', $transport);

            throw $e;
        }
    }

    public function __toString(): string
    {
        return '['.implode(',', array_keys($this->transports)).']';
    }
}