friendica/src/Module/WellKnown/HostMeta.php

<?php

namespace Friendica\Module\WellKnown;

use Friendica\BaseModule;
use Friendica\Core\Renderer;
use Friendica\DI;
use Friendica\Protocol\Salmon;
use Friendica\Util\Crypto;

/**
 * Prints the metadata for describing this host
 * @see https://tools.ietf.org/html/rfc6415
 */
class HostMeta extends BaseModule
{
	public static function rawContent(array $parameters = [])
	{
		$app = DI::app();
		$config = DI::config();

		header('Content-type: text/xml');

		if (!$config->get('system', 'site_pubkey', false)) {
			$res = Crypto::newKeypair(1024);

			$config->set('system', 'site_prvkey', $res['prvkey']);
			$config->set('system', 'site_pubkey', $res['pubkey']);
		}

		$tpl = Renderer::getMarkupTemplate('xrd_host.tpl');
		echo Renderer::replaceMacros($tpl, [
			'$zhost'  => DI::baseUrl()->getHostname()(),
			'$zroot'  => $app->getBaseURL(),
			'$domain' => $app->getBaseURL(),
			'$bigkey' => Salmon::salmonKey($config->get('system', 'site_pubkey'))
		]);

		exit();
	}
}