simplify error responses for KMS (#16793)

internal/kms/errors.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2015-2023 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package kms
+
+// Error encapsulates S3 API error response fields.
+type Error struct {
+	Err            error
+	APICode        string
+	HTTPStatusCode int
+}
+
+func (e Error) Error() string {
+	return e.Err.Error()
+}