Do not do redirect handling when loggin out

Fixes #12568
Since the clearing of the execution context causes another reload. We
should not do the redirect_uri handling as this results in redirecting
back to the logout page on login.

This adds a simple middleware that will just check if the
ClearExecutionContext session variable is set. If that is the case it
will just redirect back to the login page.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

core/Controller/LoginController.php

@@ -131,6 +131,8 @@ class LoginController extends Controller {
 		$this->userSession->logout();
 
 		$response = new RedirectResponse($this->urlGenerator->linkToRouteAbsolute('core.login.showLoginForm'));
+		$this->session->set('clearingExecutionContexts', '1');
+		$this->session->close();
 		$response->addHeader('Clear-Site-Data', '"cache", "storage", "executionContexts"');
 		return $response;
 	}
@@ -146,7 +148,6 @@ class LoginController extends Controller {
 	 * @return TemplateResponse|RedirectResponse
 	 */
 	public function showLoginForm(string $user = null, string $redirect_url = null): Http\Response {
-
 		if ($this->userSession->isLoggedIn()) {
 			return new RedirectResponse(OC_Util::getDefaultPageUrl());
 		}

lib/composer/composer/autoload_classmap.php

@@ -430,10 +430,12 @@ return array(
     'OC\\AppFramework\\Middleware\\Security\\Exceptions\\NotAdminException' => $baseDir . '/lib/private/AppFramework/Middleware/Security/Exceptions/NotAdminException.php',
     'OC\\AppFramework\\Middleware\\Security\\Exceptions\\NotConfirmedException' => $baseDir . '/lib/private/AppFramework/Middleware/Security/Exceptions/NotConfirmedException.php',
     'OC\\AppFramework\\Middleware\\Security\\Exceptions\\NotLoggedInException' => $baseDir . '/lib/private/AppFramework/Middleware/Security/Exceptions/NotLoggedInException.php',
+    'OC\\AppFramework\\Middleware\\Security\\Exceptions\\ReloadExecutionException' => $baseDir . '/lib/private/AppFramework/Middleware/Security/Exceptions/ReloadExecutionException.php',
     'OC\\AppFramework\\Middleware\\Security\\Exceptions\\SecurityException' => $baseDir . '/lib/private/AppFramework/Middleware/Security/Exceptions/SecurityException.php',
     'OC\\AppFramework\\Middleware\\Security\\Exceptions\\StrictCookieMissingException' => $baseDir . '/lib/private/AppFramework/Middleware/Security/Exceptions/StrictCookieMissingException.php',
     'OC\\AppFramework\\Middleware\\Security\\PasswordConfirmationMiddleware' => $baseDir . '/lib/private/AppFramework/Middleware/Security/PasswordConfirmationMiddleware.php',
     'OC\\AppFramework\\Middleware\\Security\\RateLimitingMiddleware' => $baseDir . '/lib/private/AppFramework/Middleware/Security/RateLimitingMiddleware.php',
+    'OC\\AppFramework\\Middleware\\Security\\ReloadExecutionMiddleware' => $baseDir . '/lib/private/AppFramework/Middleware/Security/ReloadExecutionMiddleware.php',
     'OC\\AppFramework\\Middleware\\Security\\SameSiteCookieMiddleware' => $baseDir . '/lib/private/AppFramework/Middleware/Security/SameSiteCookieMiddleware.php',
     'OC\\AppFramework\\Middleware\\Security\\SecurityMiddleware' => $baseDir . '/lib/private/AppFramework/Middleware/Security/SecurityMiddleware.php',
     'OC\\AppFramework\\Middleware\\SessionMiddleware' => $baseDir . '/lib/private/AppFramework/Middleware/SessionMiddleware.php',

lib/composer/composer/autoload_static.php

@@ -460,10 +460,12 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\AppFramework\\Middleware\\Security\\Exceptions\\NotAdminException' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/Exceptions/NotAdminException.php',
         'OC\\AppFramework\\Middleware\\Security\\Exceptions\\NotConfirmedException' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/Exceptions/NotConfirmedException.php',
         'OC\\AppFramework\\Middleware\\Security\\Exceptions\\NotLoggedInException' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/Exceptions/NotLoggedInException.php',
+        'OC\\AppFramework\\Middleware\\Security\\Exceptions\\ReloadExecutionException' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/Exceptions/ReloadExecutionException.php',
         'OC\\AppFramework\\Middleware\\Security\\Exceptions\\SecurityException' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/Exceptions/SecurityException.php',
         'OC\\AppFramework\\Middleware\\Security\\Exceptions\\StrictCookieMissingException' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/Exceptions/StrictCookieMissingException.php',
         'OC\\AppFramework\\Middleware\\Security\\PasswordConfirmationMiddleware' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/PasswordConfirmationMiddleware.php',
         'OC\\AppFramework\\Middleware\\Security\\RateLimitingMiddleware' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/RateLimitingMiddleware.php',
+        'OC\\AppFramework\\Middleware\\Security\\ReloadExecutionMiddleware' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/ReloadExecutionMiddleware.php',
         'OC\\AppFramework\\Middleware\\Security\\SameSiteCookieMiddleware' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/SameSiteCookieMiddleware.php',
         'OC\\AppFramework\\Middleware\\Security\\SecurityMiddleware' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/Security/SecurityMiddleware.php',
         'OC\\AppFramework\\Middleware\\SessionMiddleware' => __DIR__ . '/../../..' . '/lib/private/AppFramework/Middleware/SessionMiddleware.php',

lib/private/AppFramework/DependencyInjection/DIContainer.php

@@ -279,6 +279,7 @@ class DIContainer extends SimpleContainer implements IAppContainer {
 		$middleWares = &$this->middleWares;
 		$this->registerService('MiddlewareDispatcher', function(SimpleContainer $c) use (&$middleWares) {
 			$dispatcher = new MiddlewareDispatcher();
+			$dispatcher->registerMiddleware($c->query(OC\AppFramework\Middleware\Security\ReloadExecutionMiddleware::class));
 			$dispatcher->registerMiddleware($c[OC\AppFramework\Middleware\Security\SameSiteCookieMiddleware::class]);
 			$dispatcher->registerMiddleware($c['CORSMiddleware']);
 			$dispatcher->registerMiddleware($c['OCSMiddleware']);

lib/private/AppFramework/Middleware/Security/Exceptions/ReloadExecutionException.php

@@ -0,0 +1,29 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\AppFramework\Middleware\Security\Exceptions;
+
+class ReloadExecutionException extends SecurityException {
+
+}

lib/private/AppFramework/Middleware/Security/ReloadExecutionMiddleware.php

@@ -0,0 +1,68 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\AppFramework\Middleware\Security;
+
+use OC\AppFramework\Middleware\Security\Exceptions\ReloadExecutionException;
+use OCP\AppFramework\Http\RedirectResponse;
+use OCP\AppFramework\Middleware;
+use OCP\ISession;
+use OCP\IURLGenerator;
+
+/**
+ * Simple middleware to handle the clearing of the execution context. This will trigger
+ * a reload but if the session variable is set we properly redirect to the login page.
+ */
+class ReloadExecutionMiddleware extends Middleware {
+	/** @var ISession */
+	private $session;
+	/** @var IURLGenerator */
+	private $urlGenerator;
+
+	public function __construct(ISession $session, IURLGenerator $urlGenerator) {
+		$this->session = $session;
+		$this->urlGenerator = $urlGenerator;
+	}
+
+	public function beforeController($controller, $methodName) {
+		if ($this->session->exists('clearingExecutionContexts')) {
+			throw new ReloadExecutionException();
+		}
+	}
+
+	public function afterException($controller, $methodName, \Exception $exception) {
+		if ($exception instanceof ReloadExecutionException) {
+			$this->session->remove('clearingExecutionContexts');
+
+			return new RedirectResponse($this->urlGenerator->linkToRouteAbsolute(
+				'core.login.showLoginForm',
+				['clear' => true] // this param the the code in login.js may be removed when the "Clear-Site-Data" is working in the browsers
+			));
+		}
+
+		return parent::afterException($controller, $methodName, $exception);
+	}
+
+
+}