ScrewTurn.Wiki.PermissionsManager.AddAclEntriesForDirectory C# (CSharp) Method

        private bool AddAclEntriesForDirectory(string subject, IFilesStorageProviderV30 provider, string directory, string[] grants, string[] denials)
        {
            bool isGroup = subject.StartsWith("G.");
            subject = subject.Substring(2);

            UserGroup group = null;
            UserInfo user = null;

            if(isGroup) group = Users.FindUserGroup(subject);
            else user = Users.FindUser(subject);

            foreach(string action in grants) {
                bool done = false;
                if(isGroup) {
                    done = AuthWriter.SetPermissionForDirectory(AuthStatus.Grant,
                        provider, directory, action, group);
                }
                else {
                    done = AuthWriter.SetPermissionForDirectory(AuthStatus.Grant,
                        provider, directory, action, user);
                }
                if(!done) return false;
            }

            foreach(string action in denials) {
                bool done = false;
                if(isGroup) {
                    done = AuthWriter.SetPermissionForDirectory(AuthStatus.Deny,
                        provider, directory, action, group);
                }
                else {
                    done = AuthWriter.SetPermissionForDirectory(AuthStatus.Deny,
                        provider, directory, action, user);
                }
                if(!done) return false;
            }

            return true;
        }