From e7cd6d0e60b626548f2db27c173dab5a4d9a97d4 Mon Sep 17 00:00:00 2001
From: Varun Patil <radialapps@gmail.com>
Date: Fri, 26 May 2023 11:05:44 -0700
Subject: [PATCH] hooks: clear all cache on logout (close #665)

Signed-off-by: Varun Patil <radialapps@gmail.com>
---
 lib/AppInfo/Application.php              |  8 +++++
 lib/Listeners/BeforeTemplateListener.php | 45 ++++++++++++++++++++++++
 lib/Listeners/PostLogoutListener.php     | 43 ++++++++++++++++++++++
 src/hooks/clear-cache.ts                 | 11 ++++++
 webpack.js                               |  1 +
 5 files changed, 108 insertions(+)
 create mode 100644 lib/Listeners/BeforeTemplateListener.php
 create mode 100644 lib/Listeners/PostLogoutListener.php
 create mode 100644 src/hooks/clear-cache.ts

diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 91a46cbb..236eb071 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -24,16 +24,20 @@ declare(strict_types=1);
 namespace OCA\Memories\AppInfo;
 
 use OCA\Memories\ClustersBackend;
+use OCA\Memories\Listeners\BeforeTemplateListener;
 use OCA\Memories\Listeners\PostDeleteListener;
+use OCA\Memories\Listeners\PostLogoutListener;
 use OCA\Memories\Listeners\PostWriteListener;
 use OCA\Memories\Util;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
+use OCP\AppFramework\Http\Events\BeforeTemplateRenderedEvent;
 use OCP\Files\Events\Node\NodeDeletedEvent;
 use OCP\Files\Events\Node\NodeTouchedEvent;
 use OCP\Files\Events\Node\NodeWrittenEvent;
+use OCP\User\Events\UserLoggedOutEvent;
 
 const AUTH_HEADER = 'HTTP_AUTHORIZATION';
 
@@ -77,6 +81,10 @@ class Application extends App implements IBootstrap
         $context->registerEventListener(NodeTouchedEvent::class, PostWriteListener::class);
         $context->registerEventListener(NodeDeletedEvent::class, PostDeleteListener::class);
 
+        // Register other global hooks
+        $context->registerEventListener(BeforeTemplateRenderedEvent::class, BeforeTemplateListener::class);
+        $context->registerEventListener(UserLoggedOutEvent::class, PostLogoutListener::class);
+
         // Register clusters backends
         ClustersBackend\AlbumsBackend::register();
         ClustersBackend\TagsBackend::register();
diff --git a/lib/Listeners/BeforeTemplateListener.php b/lib/Listeners/BeforeTemplateListener.php
new file mode 100644
index 00000000..fd8f20b7
--- /dev/null
+++ b/lib/Listeners/BeforeTemplateListener.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @license AGPL-3.0-or-later
+ *
+ * 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 OCA\Memories\Listeners;
+
+use OCA\Memories\AppInfo\Application;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\ISession;
+
+class BeforeTemplateListener implements IEventListener
+{
+    private ISession $session;
+
+    public function __construct(ISession $session)
+    {
+        $this->session = $session;
+    }
+
+    public function handle(Event $event): void
+    {
+        if (null !== $this->session->get(PostLogoutListener::CLEAR_CACHE_KEY)) {
+            $this->session->remove(PostLogoutListener::CLEAR_CACHE_KEY);
+            \OCP\Util::addScript(Application::APPNAME, 'memories-hooks-clear-cache');
+        }
+    }
+}
diff --git a/lib/Listeners/PostLogoutListener.php b/lib/Listeners/PostLogoutListener.php
new file mode 100644
index 00000000..a4d1d131
--- /dev/null
+++ b/lib/Listeners/PostLogoutListener.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @license AGPL-3.0-or-later
+ *
+ * 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 OCA\Memories\Listeners;
+
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\ISession;
+
+class PostLogoutListener implements IEventListener
+{
+    public const CLEAR_CACHE_KEY = 'memories_clear_cache';
+
+    private ISession $session;
+
+    public function __construct(ISession $session)
+    {
+        $this->session = $session;
+    }
+
+    public function handle(Event $event): void
+    {
+        $this->session->set(self::CLEAR_CACHE_KEY, '1');
+    }
+}
diff --git a/src/hooks/clear-cache.ts b/src/hooks/clear-cache.ts
new file mode 100644
index 00000000..9b5dd66f
--- /dev/null
+++ b/src/hooks/clear-cache.ts
@@ -0,0 +1,11 @@
+// DO NOT import this file anywhere, it clears all caches on load.
+// Imported as a hook from BeforeTemplateListener.php
+
+(async function () {
+  const keys = (await window.caches?.keys()) ?? [];
+  for (const key of keys) {
+    if (key.match(/^memories-/)) {
+      window.caches.delete(key);
+    }
+  }
+})();
diff --git a/webpack.js b/webpack.js
index 81b320b7..72e4e039 100644
--- a/webpack.js
+++ b/webpack.js
@@ -11,6 +11,7 @@ const isDev = buildMode === 'development';
 webpackConfig.entry = {
   main: path.resolve(path.join('src', 'main')),
   admin: path.resolve(path.join('src', 'admin')),
+  'hooks-clear-cache': path.resolve(path.join('src', 'hooks', 'clear-cache')),
 };
 
 // Enable TypeScript