From e0cc95f3aa109134a1eb2b9589b2682bd4fe5d5d Mon Sep 17 00:00:00 2001
From: Roeland Jago Douma <roeland@famdouma.nl>
Date: Thu, 23 Jul 2020 10:42:40 +0200
Subject: [PATCH] Allow user backends to specify a custom logout url

* Allows SSO backends to do a global logout

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
---
 lib/composer/composer/autoload_classmap.php |  1 +
 lib/composer/composer/autoload_static.php   |  1 +
 lib/private/legacy/OC_User.php              |  8 ++++
 lib/public/User/Backend/ICustomLogout.php   | 43 +++++++++++++++++++++
 4 files changed, 53 insertions(+)
 create mode 100644 lib/public/User/Backend/ICustomLogout.php

diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 94e35bf1b1..56184fa1af 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -498,6 +498,7 @@ return array(
     'OCP\\User\\Backend\\ICheckPasswordBackend' => $baseDir . '/lib/public/User/Backend/ICheckPasswordBackend.php',
     'OCP\\User\\Backend\\ICountUsersBackend' => $baseDir . '/lib/public/User/Backend/ICountUsersBackend.php',
     'OCP\\User\\Backend\\ICreateUserBackend' => $baseDir . '/lib/public/User/Backend/ICreateUserBackend.php',
+    'OCP\\User\\Backend\\ICustomLogout' => $baseDir . '/lib/public/User/Backend/ICustomLogout.php',
     'OCP\\User\\Backend\\IGetDisplayNameBackend' => $baseDir . '/lib/public/User/Backend/IGetDisplayNameBackend.php',
     'OCP\\User\\Backend\\IGetHomeBackend' => $baseDir . '/lib/public/User/Backend/IGetHomeBackend.php',
     'OCP\\User\\Backend\\IGetRealUIDBackend' => $baseDir . '/lib/public/User/Backend/IGetRealUIDBackend.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 1892c3bc96..02ec97d476 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -527,6 +527,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\User\\Backend\\ICheckPasswordBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ICheckPasswordBackend.php',
         'OCP\\User\\Backend\\ICountUsersBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ICountUsersBackend.php',
         'OCP\\User\\Backend\\ICreateUserBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ICreateUserBackend.php',
+        'OCP\\User\\Backend\\ICustomLogout' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ICustomLogout.php',
         'OCP\\User\\Backend\\IGetDisplayNameBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/IGetDisplayNameBackend.php',
         'OCP\\User\\Backend\\IGetHomeBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/IGetHomeBackend.php',
         'OCP\\User\\Backend\\IGetRealUIDBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/IGetRealUIDBackend.php',
diff --git a/lib/private/legacy/OC_User.php b/lib/private/legacy/OC_User.php
index c61d99eee7..29c78da6ef 100644
--- a/lib/private/legacy/OC_User.php
+++ b/lib/private/legacy/OC_User.php
@@ -273,6 +273,14 @@ class OC_User {
 			return $backend->getLogoutUrl();
 		}
 
+		$user = \OC::$server->getUserSession()->getUser();
+		if ($user instanceof \OCP\IUser) {
+			$backend = $user->getBackend();
+			if ($backend instanceof \OCP\User\Backend\ICustomLogout) {
+				return $backend->getLogoutUrl();
+			}
+		}
+
 		$logoutUrl = $urlGenerator->linkToRoute('core.login.logout');
 		$logoutUrl .= '?requesttoken=' . urlencode(\OCP\Util::callRegister());
 
diff --git a/lib/public/User/Backend/ICustomLogout.php b/lib/public/User/Backend/ICustomLogout.php
new file mode 100644
index 0000000000..a6210a2464
--- /dev/null
+++ b/lib/public/User/Backend/ICustomLogout.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020, 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 OCP\User\Backend;
+
+/**
+ * @since 20.0.0
+ *
+ * Allow backends to signal that they handle logout. For example
+ * SSO providers that also have a SSO logout url
+ */
+interface ICustomLogout {
+	/**
+	 * @since 20.0.0
+	 *
+	 * The url to redirect to for logout
+	 *
+	 * @return string
+	 */
+	public function getLogoutUrl(): string;
+}