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Editing: BearerAuth.php

<?php

/**
 * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */
namespace OCA\DAV\Connector\Sabre;

use OCP\AppFramework\Http;
use OCP\Defaults;
use OCP\IConfig;
use OCP\IRequest;
use OCP\ISession;
use OCP\IUserSession;
use Sabre\DAV\Auth\Backend\AbstractBearer;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;

class BearerAuth extends AbstractBearer {
	public function __construct(
		private IUserSession $userSession,
		private ISession $session,
		private IRequest $request,
		private IConfig $config,
		private string $principalPrefix = 'principals/users/',
	) {
		// setup realm
		$defaults = new Defaults();
		$this->realm = $defaults->getName() ?: 'Nextcloud';
	}

private function setupUserFs($userId) {
		\OC_Util::setupFS($userId);
		$this->session->close();
		return $this->principalPrefix . $userId;
	}

/**
	 * {@inheritdoc}
	 */
	public function validateBearerToken($bearerToken) {
		\OC_Util::setupFS();

if (!$this->userSession->isLoggedIn()) {
			$this->userSession->tryTokenLogin($this->request);
		}
		if ($this->userSession->isLoggedIn()) {
			return $this->setupUserFs($this->userSession->getUser()->getUID());
		}

return false;
	}

/**
	 * \Sabre\DAV\Auth\Backend\AbstractBearer::challenge sets an WWW-Authenticate
	 * header which some DAV clients can't handle. Thus we override this function
	 * and make it simply return a 401.
	 *
	 * @param RequestInterface $request
	 * @param ResponseInterface $response
	 */
	public function challenge(RequestInterface $request, ResponseInterface $response): void {
		// Legacy ownCloud clients still authenticate via OAuth2
		$enableOcClients = $this->config->getSystemValueBool('oauth2.enable_oc_clients', false);
		$userAgent = $request->getHeader('User-Agent');
		if ($enableOcClients && $userAgent !== null && str_contains($userAgent, 'mirall')) {
			parent::challenge($request, $response);
			return;
		}

$response->setStatus(Http::STATUS_UNAUTHORIZED);
	}
}

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