Merge pull request #3963 from nextcloud/logs-access-to-previews

Log access to preview images

apps/admin_audit/appinfo/app.php

@@ -1,6 +1,7 @@
 <?php
 /**
-
+ * @copyright Copyright (c) 2016 Bjoern Schiessle <bjoern@schiessle.org>
+ * @copyright Copyright (c) 2017 Lukas Reschke <lukas@statuscode.ch>
  *
  * @author Bjoern Schiessle <bjoern@schiessle.org>
  * @author Lukas Reschke <lukas@statuscode.ch>
@@ -25,6 +26,12 @@
 $logger = \OC::$server->getLogger();
 $userSession = \OC::$server->getUserSession();
 $groupManager = \OC::$server->getGroupManager();
+$eventDispatcher = \OC::$server->getEventDispatcher();
 
-$auditLogger = new \OCA\Admin_Audit\AuditLogger($logger, $userSession, $groupManager);
+$auditLogger = new \OCA\Admin_Audit\AuditLogger(
+	$logger,
+	$userSession,
+	$groupManager,
+	$eventDispatcher
+);
 $auditLogger->registerHooks();

apps/admin_audit/lib/actions/files.php

@@ -134,4 +134,23 @@ class Files extends Action {
 			]
 		);
 	}
+
+	/**
+	 * Logs preview access to a file
+	 *
+	 * @param array $params
+	 */
+	public function preview(array $params) {
+		$this->log(
+			'Preview accessed: "%s" (width: "%s", height: "%s" crop: "%s", mode: "%s")',
+			$params,
+			[
+				'path',
+				'width',
+				'height',
+				'crop',
+				'mode'
+			]
+		);
+	}
 }

apps/admin_audit/lib/auditlogger.php

@@ -1,8 +1,10 @@
 <?php
 /**
  * @copyright Copyright (c) 2016 Bjoern Schiessle <bjoern@schiessle.org>
+ * @copyright Copyright (c) 2017 Lukas Reschke <lukas@statuscode.ch>
  *
  * @author Bjoern Schiessle <bjoern@schiessle.org>
+ * @author Lukas Reschke <lukas@statuscode.ch>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -21,11 +23,10 @@
  *
  */
 
-
 namespace OCA\Admin_Audit;
 
-
 use OC\Files\Filesystem;
+use OC\Files\Node\File;
 use OCA\Admin_Audit\Actions\Auth;
 use OCA\Admin_Audit\Actions\Files;
 use OCA\Admin_Audit\Actions\GroupManagement;
@@ -35,17 +36,17 @@ use OCA\Admin_Audit\Actions\UserManagement;
 use OCA\Admin_Audit\Actions\Versions;
 use OCP\IGroupManager;
 use OCP\ILogger;
+use OCP\IPreview;
 use OCP\IUserSession;
 use OCP\Util;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\GenericEvent;
 
 class AuditLogger {
-
 	/** @var ILogger */
 	private $logger;
-
 	/** @var IUserSession */
 	private $userSession;
-	
 	/** @var IGroupManager */
 	private $groupManager;
 
@@ -55,17 +56,20 @@ class AuditLogger {
 	 * @param ILogger $logger
 	 * @param IUserSession $userSession
 	 * @param IGroupManager $groupManager
+	 * @param EventDispatcherInterface $eventDispatcher
 	 */
 	public function __construct(ILogger $logger,
 								IUserSession $userSession, 
-								IGroupManager $groupManager) {
+								IGroupManager $groupManager,
+								EventDispatcherInterface $eventDispatcher) {
 		$this->logger = $logger;
 		$this->userSession = $userSession;
 		$this->groupManager = $groupManager;
+		$this->eventDispatcher = $eventDispatcher;
 	}
 
 	/**
-	 * register hooks in order to log them
+	 * Register hooks in order to log them
 	 */
 	public function registerHooks() {
 		$this->userManagementHooks();
@@ -78,7 +82,7 @@ class AuditLogger {
 	}
 
 	/**
-	 * connect to user management hooks
+	 * Connect to user management hooks
 	 */
 	private function userManagementHooks() {
 		$userActions = new UserManagement($this->logger);
@@ -119,12 +123,25 @@ class AuditLogger {
 		Util::connectHook('OC_User', 'logout', $authActions, 'logout');
 	}
 
-
 	/**
-	 * connect to file hooks
+	 * Connect to file hooks
 	 */
 	private function fileHooks() {
 		$fileActions = new Files($this->logger);
+		$this->eventDispatcher->addListener(
+			IPreview::EVENT,
+			function(GenericEvent $event) use ($fileActions) {
+				/** @var File $file */
+				$file = $event->getSubject();
+				$fileActions->preview([
+					'path' => substr($file->getInternalPath(), 5),
+					'width' => $event->getArguments()['width'],
+					'height' => $event->getArguments()['height'],
+					'crop' => $event->getArguments()['crop'],
+					'mode'  => $event->getArguments()['mode']
+				]);
+			}
+		);
 
 		Util::connectHook(
 			Filesystem::CLASSNAME,
@@ -177,7 +194,7 @@ class AuditLogger {
 	}
 
 	/**
-	 * connect to trash bin hooks
+	 * Connect to trash bin hooks
 	 */
 	private function trashbinHooks() {
 		$trashActions = new Trashbin($this->logger);