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opaque.go
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opaque.go
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// Copyright 2018-2021 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package common
import (
"encoding/json"
"encoding/xml"
"fmt"
"github.com/BurntSushi/toml"
types "github.com/cs3org/go-cs3apis/cs3/types/v1beta1"
)
// DecodeOpaqueMap decodes a Reva opaque object into a map of strings.
func DecodeOpaqueMap(opaque *types.Opaque) map[string]string {
entries := make(map[string]string)
if opaque != nil {
for k, v := range opaque.GetMap() {
switch v.Decoder {
case "plain":
entries[k] = string(v.Value)
case "json":
var s string
_ = json.Unmarshal(v.Value, &s)
entries[k] = s
case "toml":
var s string
_ = toml.Unmarshal(v.Value, &s)
entries[k] = s
case "xml":
var s string
_ = xml.Unmarshal(v.Value, &s)
entries[k] = s
}
}
}
return entries
}
// EncodeOpaqueMap encodes a map of strings into a Reva opaque entry.
// Only plain encoding is currently supported.
func EncodeOpaqueMap(opaque *types.Opaque, m map[string]string) {
if opaque == nil {
return
}
if opaque.Map == nil {
opaque.Map = map[string]*types.OpaqueEntry{}
}
for k, v := range m {
// Only plain values are currently supported
opaque.Map[k] = &types.OpaqueEntry{
Decoder: "plain",
Value: []byte(v),
}
}
}
// GetValuesFromOpaque extracts the given keys from the opaque object.
// If mandatory is set to true, all specified keys must be available in the opaque object.
func GetValuesFromOpaque(opaque *types.Opaque, keys []string, mandatory bool) (map[string]string, error) {
values := make(map[string]string)
entries := DecodeOpaqueMap(opaque)
for _, key := range keys {
if value, ok := entries[key]; ok {
values[key] = value
} else if mandatory {
return map[string]string{}, fmt.Errorf("missing opaque entry '%v'", key)
}
}
return values, nil
}