Fix leave share for root folder

lib/Connector/Sabre/LockPlugin.php

@@ -108,7 +108,10 @@ public function checkLock(RequestInterface $request): void {
 				}
 
 				// Prevent moving or copying stuff from non-encrypted to encrypted folders
-				if ($this->isE2EEnabledPath($node) xor $this->isE2EEnabledPath($destNode)) {
+				// if original operation is not a DELETE
+				if ($this->isE2EEnabledPath($node) !== $this->isE2EEnabledPath($destNode)
+					&& $request->getHeader('X-Nc-Sabre-Original-Method') !== 'DELETE'
+				) {
 					throw new Forbidden('Cannot copy or move files from non-encrypted folders to end to end encrypted folders or vice versa.');
 				}
 			}

lib/FileService.php

@@ -23,6 +23,7 @@
 namespace OCA\EndToEndEncryption;
 
 use OCA\EndToEndEncryption\Connector\Sabre\RedirectRequestPlugin;
+use OCA\Files_Sharing\SharedStorage;
 use OCP\Files\Folder;
 use OCP\Files\Node;
 
@@ -72,6 +73,12 @@ public function finalizeChanges(Folder $folder): bool {
 
 		/** @var Node $intermediateFile */
 		foreach ($intermediateFiles['to_delete'] as $intermediateFile) {
+			// If shared to user, try to unshare it first
+			$storage = $intermediateFile->getStorage();
+			if ($storage->instanceOfStorage(SharedStorage::class) && $storage->unshareStorage()) {
+				continue;
+			}
+			// Otherwise delete it
 			$intermediateFile->delete();
 		}
 
@@ -83,6 +90,14 @@ public function finalizeChanges(Folder $folder): bool {
 	 * @return array{to_save: Node[], to_delete: Node[]}
 	 */
 	private function getIntermediateFiles(Folder $folder): array {
+		// Special case when root folder is deleted/unshared
+		if ($this->isIntermediateFileToDelete($folder)) {
+			return [
+				'to_save' => [],
+				'to_delete' => [$folder]
+			];
+		}
+
 		$listing = $folder->getDirectoryListing();
 		$result = [
 			'to_save' => [],