vendor/symfony/swiftmailer-bundle/DependencyInjection/SwiftmailerExtension.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\Bundle\SwiftmailerBundle\DependencyInjection;

use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Alias;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\DependencyInjection\ChildDefinition;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\DefinitionDecorator;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;

/**
 * SwiftmailerExtension is an extension for the SwiftMailer library.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class SwiftmailerExtension extends Extension
{
    /**
     * Loads the Swift Mailer configuration.
     *
     * Usage example:
     *
     *      <swiftmailer:config transport="gmail">
     *        <swiftmailer:username>fabien</swift:username>
     *        <swiftmailer:password>xxxxx</swift:password>
     *        <swiftmailer:spool path="/path/to/spool/" />
     *      </swiftmailer:config>
     *
     * @param array            $configs   An array of configuration settings
     * @param ContainerBuilder $container A ContainerBuilder instance
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('swiftmailer.xml');

        $configuration = $this->getConfiguration($configs, $container);
        $config = $this->processConfiguration($configuration, $configs);

        $mailers = array();
        foreach ($config['mailers'] as $name => $mailer) {
            $isDefaultMailer = $config['default_mailer'] === $name;
            $this->configureMailer($name, $mailer, $container, $isDefaultMailer);
            $mailers[$name] = sprintf('swiftmailer.mailer.%s', $name);
        }
        ksort($mailers);