friendica/src/Module/PublicRSAKey.php

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<?php
namespace Friendica\Module;
use ASN_BASE;
use Friendica\BaseModule;
use Friendica\Model\User;
use Friendica\Network\HTTPException\BadRequestException;
/**
* prints the public RSA key of a user
*/
class PublicRSAKey extends BaseModule
{
public static function rawContent(array $parameters = [])
{
$app = self::getApp();
// @TODO: Replace with parameter from router
if ($app->argc !== 2) {
throw new BadRequestException();
}
// @TODO: Replace with parameter from router
$nick = $app->argv[1];
$user = User::getByNickname($nick, ['spubkey']);
if (empty($user) || empty($user['spubkey'])) {
throw new BadRequestException();
}
$lines = explode("\n", $user['spubkey']);
unset($lines[0]);
unset($lines[count($lines)]);
$asnString = base64_decode(implode('', $lines));
$asnBase = ASN_BASE::parseASNString($asnString);
$m = $asnBase[0]->asnData[1]->asnData[0]->asnData[0]->asnData;
$e = $asnBase[0]->asnData[1]->asnData[0]->asnData[1]->asnData;
header('Content-type: application/magic-public-key');
echo 'RSA' . '.' . $m . '.' . $e;
exit();
}
}