OP#792 initial commit after fork

cmd/bucket-encryption.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2015-2021 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 cmd
+
+import (
+	"errors"
+	"io"
+
+	sse "github.com/minio/minio/internal/bucket/encryption"
+)
+
+// BucketSSEConfigSys - in-memory cache of bucket encryption config
+type BucketSSEConfigSys struct{}
+
+// NewBucketSSEConfigSys - Creates an empty in-memory bucket encryption configuration cache
+func NewBucketSSEConfigSys() *BucketSSEConfigSys {
+	return &BucketSSEConfigSys{}
+}
+
+// Get - gets bucket encryption config for the given bucket.
+func (sys *BucketSSEConfigSys) Get(bucket string) (*sse.BucketSSEConfig, error) {
+	sseCfg, _, err := globalBucketMetadataSys.GetSSEConfig(bucket)
+	return sseCfg, err
+}
+
+// validateBucketSSEConfig parses bucket encryption configuration and validates if it is supported by MinIO.
+func validateBucketSSEConfig(r io.Reader) (*sse.BucketSSEConfig, error) {
+	encConfig, err := sse.ParseBucketSSEConfig(r)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(encConfig.Rules) == 1 {
+		return encConfig, nil
+	}
+
+	return nil, errors.New("Unsupported bucket encryption configuration")
+}