ask for share-permissions on propfind

apps/files_sharing/lib/external/storage.php

@@ -319,5 +319,21 @@ class Storage extends DAV implements ISharedStorage {
 		}
 		return ($this->getPermissions($path) & \OCP\Constants::PERMISSION_SHARE);
 	}
+	
+	public function getPermissions($path) {
+		$response = $this->propfind($path);
+		if (isset($response['{http://open-collaboration-services.org/ns}share-permissions'])) {
+			$permissions = $response['{http://open-collaboration-services.org/ns}share-permissions'];
+		} else {
+			// use default permission if remote server doesn't provide the share permissions
+			if ($this->is_dir($path)) {
+				$permissions = \OCP\Constants::PERMISSION_ALL;
+			} else {
+				$permissions = \OCP\Constants::PERMISSION_ALL & ~\OCP\Constants::PERMISSION_CREATE;
+			}
+		}
+
+		return $permissions;
+	}
 
 }

lib/private/files/storage/dav.php

@@ -246,7 +246,7 @@ class DAV extends Common {
 	 *
 	 * @throws NotFound
 	 */
-	private function propfind($path) {
+	protected function propfind($path) {
 		$path = $this->cleanPath($path);
 		$cachedResponse = $this->statCache->get($path);
 		if ($cachedResponse === false) {
@@ -264,6 +264,7 @@ class DAV extends Common {
 						'{DAV:}getcontentlength',
 						'{DAV:}getcontenttype',
 						'{http://owncloud.org/ns}permissions',
+						'{http://open-collaboration-services.org/ns}share-permissions',
 						'{DAV:}resourcetype',
 						'{DAV:}getetag',
 					)