Fix data for shared root folder

apps/files_sharing/lib/cache.php

@@ -62,7 +62,9 @@ class Shared_Cache extends Cache {
 	 * @return array
 	 */
 	public function get($file) {
-		if (is_string($file)) {
+		if ($file == '') {
+			return \OCP\Share::getItemsSharedWith('file', \OC_Share_Backend_File::FORMAT_FILE_APP_ROOT);
+		} else if (is_string($file)) {
 			if ($cache = $this->getSourceCache($file)) {
 				return $cache->get($this->files[$file]);
 			}

apps/files_sharing/lib/permissions.php

@@ -30,6 +30,9 @@ class Shared_Permissions {
 	 * @return int (-1 if file no permissions set)
 	 */
 	static public function get($fileId, $user) {
+		if ($fileId == -1) {
+			return \OCP\PERMISSION_READ;
+		}
 		$source = \OCP\Share::getItemSharedWithBySource('file', $fileId, \OC_Share_Backend_File::FORMAT_SHARED_STORAGE);
 		if ($source) {
 			return $source['permissions'];

apps/files_sharing/lib/share/file.php

@@ -23,8 +23,9 @@ class OC_Share_Backend_File implements OCP\Share_Backend_File_Dependent {
 
 	const FORMAT_SHARED_STORAGE = 0;
 	const FORMAT_GET_FOLDER_CONTENTS = 1;
-	const FORMAT_GET_ALL = 2;
+	const FORMAT_FILE_APP_ROOT = 2;
 	const FORMAT_OPENDIR = 3;
+	const FORMAT_GET_ALL = 4;
 
 	private $path;
 
@@ -82,24 +83,35 @@ class OC_Share_Backend_File implements OCP\Share_Backend_File_Dependent {
 				$file['parent'] = $item['file_parent'];
 				$file['name'] = basename($item['file_target']);
 				$file['mimetype'] = $item['mimetype'];
+				$file['mimepart'] = $item['mimepart'];
 				$file['size'] = $item['size'];
 				$file['mtime'] = $item['mtime'];
 				$file['encrypted'] = $item['encrypted'];
 				$files[] = $file;
 			}
 			return $files;
-		} else if ($format == self::FORMAT_GET_ALL) {
-			$ids = array();
+		} else if ($format == self::FORMAT_FILE_APP_ROOT) {
+			$mtime = 0;
+			$size = 0;
 			foreach ($items as $item) {
-				$ids[] = $item['file_source'];
+				if ($item['mtime'] > $mtime) {
+					$mtime = $item['mtime'];
+				}
+				$size += (int)$item['size'];
 			}
-			return $ids;
+			return array('fileid' => -1, 'name' => 'Shared', 'mtime' => $mtime, 'mimetype' => 'httpd/unix-directory', 'size' => $size);
 		} else if ($format == self::FORMAT_OPENDIR) {
 			$files = array();
 			foreach ($items as $item) {
 				$files[] = basename($item['file_target']);
 			}
 			return $files;
+		} else if ($format == self::FORMAT_GET_ALL) {
+			$ids = array();
+			foreach ($items as $item) {
+				$ids[] = $item['file_source'];
+			}
+			return $ids;
 		}
 		return array();
 	}

lib/public/share.php

@@ -681,7 +681,7 @@ class Share {
 				}
 			} else {
 				if ($fileDependent) {
-					if (($itemType == 'file' || $itemType == 'folder') && $format == \OC_Share_Backend_File::FORMAT_GET_FOLDER_CONTENTS) {
+					if (($itemType == 'file' || $itemType == 'folder') && $format == \OC_Share_Backend_File::FORMAT_GET_FOLDER_CONTENTS || $format == \OC_Share_Backend_File::FORMAT_FILE_APP_ROOT) {
 						$select = '`*PREFIX*share`.`id`, `item_type`, `*PREFIX*share`.`parent`, `uid_owner`, `share_type`, `share_with`, `file_source`, `path`, `file_target`, `permissions`, `expiration`, `*PREFIX*filecache`.`parent` as `file_parent`, `name`, `mtime`, `mimetype`, `mimepart`, `size`, `encrypted`';
 					} else {
 						$select = '`*PREFIX*share`.`id`, `item_type`, `item_source`, `item_target`, `*PREFIX*share`.`parent`, `share_type`, `share_with`, `uid_owner`, `file_source`, `path`, `file_target`, `permissions`, `stime`, `expiration`, `token`';