/usr/share/php/Swift/swift_required.php is in php-swiftmailer 5.4.2-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
/*
 * Autoloader and dependency injection initialization for Swift Mailer.
 */
if (class_exists('Swift', false)) {
    return;
}
// Load Swift utility class
require dirname(__FILE__).'/classes/Swift.php';
if (!function_exists('_swiftmailer_init')) {
    function _swiftmailer_init()
    {
        require dirname(__FILE__).'/swift_init.php';
    }
}
// Start the autoloader and lazy-load the init script to set up dependency injection
Swift::registerAutoload('_swiftmailer_init');
 |