From 5610842e5669ed17983d219f6c779316f209ba92 Mon Sep 17 00:00:00 2001
From: Bjoern Schiessle <schiessle@owncloud.com>
Date: Fri, 31 Jan 2014 20:38:35 +0100
Subject: [PATCH] move unlink proxy to a hook which handles pre and post
 conditions

---
 apps/files_encryption/hooks/hooks.php | 64 +++++++++++++++++++++++++++
 apps/files_encryption/lib/helper.php  |  2 +
 apps/files_encryption/lib/proxy.php   | 41 -----------------
 3 files changed, 66 insertions(+), 41 deletions(-)

diff --git a/apps/files_encryption/hooks/hooks.php b/apps/files_encryption/hooks/hooks.php
index 09d5687e22..4c4b3f2040 100644
--- a/apps/files_encryption/hooks/hooks.php
+++ b/apps/files_encryption/hooks/hooks.php
@@ -32,6 +32,8 @@ class Hooks {
 
 	// file for which we want to rename the keys after the rename operation was successful
 	private static $renamedFiles = array();
+	// file for which we want to delete the keys after the delete operation was successful
+	private static $deleteFiles = array();
 
 	/**
 	 * @brief Startup encryption backend upon user login
@@ -630,4 +632,66 @@ class Hooks {
 		}
 	}
 
+	/**
+	 * @brief if the file was really deleted we remove the encryption keys
+	 * @param array $params
+	 * @return boolean
+	 */
+	public static function postDelete($params) {
+
+		if (!isset(self::$deleteFiles[$params[\OC\Files\Filesystem::signal_param_path]])) {
+			return true;
+		}
+
+		$deletedFile = self::$deleteFiles[$params[\OC\Files\Filesystem::signal_param_path]];
+		$path = $deletedFile['path'];
+		$user = $deletedFile['uid'];
+
+		// we don't need to remember the file any longer
+		unset(self::$deleteFiles[$params[\OC\Files\Filesystem::signal_param_path]]);
+
+		$view = new \OC\Files\View('/');
+
+		// return if the file still exists and wasn't deleted correctly
+		if ($view->file_exists('/' . $user . '/files/' . $path)) {
+			return true;
+		}
+
+		// Disable encryption proxy to prevent recursive calls
+		$proxyStatus = \OC_FileProxy::$enabled;
+		\OC_FileProxy::$enabled = false;
+
+		// Delete keyfile & shareKey so it isn't orphaned
+		if (!Keymanager::deleteFileKey($view, $path, $user)) {
+			\OCP\Util::writeLog('Encryption library',
+				'Keyfile or shareKey could not be deleted for file "' . $user.'/files/'.$path . '"', \OCP\Util::ERROR);
+		}
+
+		Keymanager::delAllShareKeys($view, $user, $path);
+
+		\OC_FileProxy::$enabled = $proxyStatus;
+	}
+
+	/**
+	 * @brief remember the file which should be deleted and it's owner
+	 * @param array $params
+	 * @return boolean
+	 */
+	public static function preDelete($params) {
+		$path = $params[\OC\Files\Filesystem::signal_param_path];
+
+		// skip this method if the trash bin is enabled or if we delete a file
+		// outside of /data/user/files
+		if (\OCP\App::isEnabled('files_trashbin')) {
+			return true;
+		}
+
+		$util = new Util(new \OC_FilesystemView('/'), \OCP\USER::getUser());
+		list($owner, $ownerPath) = $util->getUidAndFilename($path);
+
+		self::$deleteFiles[$params[\OC\Files\Filesystem::signal_param_path]] = array(
+			'uid' => $owner,
+			'path' => $ownerPath);
+	}
+
 }
diff --git a/apps/files_encryption/lib/helper.php b/apps/files_encryption/lib/helper.php
index 5dcb05fa19..bb06a57c71 100755
--- a/apps/files_encryption/lib/helper.php
+++ b/apps/files_encryption/lib/helper.php
@@ -63,6 +63,8 @@ class Helper {
 
 		\OCP\Util::connectHook('OC_Filesystem', 'rename', 'OCA\Encryption\Hooks', 'preRename');
 		\OCP\Util::connectHook('OC_Filesystem', 'post_rename', 'OCA\Encryption\Hooks', 'postRename');
+		\OCP\Util::connectHook('OC_Filesystem', 'post_delete', 'OCA\Encryption\Hooks', 'postDelete');
+		\OCP\Util::connectHook('OC_Filesystem', 'delete', 'OCA\Encryption\Hooks', 'preDelete');
 	}
 
 	/**
diff --git a/apps/files_encryption/lib/proxy.php b/apps/files_encryption/lib/proxy.php
index 4e71ab1dd5..1104800596 100644
--- a/apps/files_encryption/lib/proxy.php
+++ b/apps/files_encryption/lib/proxy.php
@@ -203,47 +203,6 @@ class Proxy extends \OC_FileProxy {
 
 	}
 
-	/**
-	 * @brief When a file is deleted, remove its keyfile also
-	 */
-	public function preUnlink($path) {
-
-		$relPath = Helper::stripUserFilesPath($path);
-
-		// skip this method if the trash bin is enabled or if we delete a file
-		// outside of /data/user/files
-		if (\OCP\App::isEnabled('files_trashbin') || $relPath === false) {
-			return true;
-		}
-
-		// Disable encryption proxy to prevent recursive calls
-		$proxyStatus = \OC_FileProxy::$enabled;
-		\OC_FileProxy::$enabled = false;
-
-		$view = new \OC_FilesystemView('/');
-
-		$userId = \OCP\USER::getUser();
-
-		$util = new Util($view, $userId);
-
-		list($owner, $ownerPath) = $util->getUidAndFilename($relPath);
-
-		// Delete keyfile & shareKey so it isn't orphaned
-		if (!Keymanager::deleteFileKey($view, $ownerPath)) {
-			\OCP\Util::writeLog('Encryption library',
-				'Keyfile or shareKey could not be deleted for file "' . $ownerPath . '"', \OCP\Util::ERROR);
-		}
-
-		Keymanager::delAllShareKeys($view, $owner, $ownerPath);
-
-		\OC_FileProxy::$enabled = $proxyStatus;
-
-		// If we don't return true then file delete will fail; better
-		// to leave orphaned keyfiles than to disallow file deletion
-		return true;
-
-	}
-
 	/**
 	 * @param $path
 	 * @return bool