1 files changed, 37 insertions, 6 deletions
diff --git a/apps/files_encryption/lib/helper.php b/apps/files_encryption/lib/helper.php
index 0ac6fcf403a..505e013c90b 100755
--- a/apps/files_encryption/lib/helper.php
+++ b/apps/files_encryption/lib/helper.php
@@ -225,10 +225,7 @@ class Helper {
 	 * @return bool
 	 */
 	public static function isPublicAccess() {
-		if (\OCP\USER::getUser() === false
-			|| (isset($_GET['service']) && $_GET['service'] == 'files'
-				&& isset($_GET['t']))
-		) {
+		if (\OCP\User::getUser() === false) {
 			return true;
 		} else {
 			return false;
@@ -256,10 +253,44 @@ class Helper {
 	}
 
 	/**
-	 * @brief get path to the correspondig file in data/user/files if path points
+	 * @brief try to get the user from the path if no user is logged in
+	 * @param string $path
+	 * @return mixed user or false if we couldn't determine a user
+	 */
+	public static function getUser($path) {
+
+		$user = \OCP\User::getUser();
+
+		// if we are logged in, then we return the userid
+		if ($user) {
+			return $user;
+		}
+
+		// if no user is logged in we try to access a publicly shared files.
+		// In this case we need to try to get the user from the path
+
+		$trimmed = ltrim($path, '/');
+		$split = explode('/', $trimmed);
+
+		// it is not a file relative to data/user/files
+		if (count($split) < 2 || $split[1] !== 'files') {
+			return false;
+		}
+
+		$user = $split[0];
+
+		if (\OCP\User::userExists($user)) {
+			return $user;
+		}
+
+		return false;
+	}
+
+	/**
+	 * @brief get path to the corresponding file in data/user/files if path points
 	 *        to a version or to a file in cache
 	 * @param string $path path to a version or a file in the trash
-	 * @return string path to correspondig file relative to data/user/files
+	 * @return string path to corresponding file relative to data/user/files
 	 */
 	public static function getPathToRealFile($path) {
 		$trimmed = ltrim($path, '/');