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minio/pkg/policy/condition/valueset.go

86 lines
1.8 KiB

/*
* Minio Cloud Storage, (C) 2018 Minio, Inc.
*
* 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.
*/
package condition
import (
"encoding/json"
"fmt"
)
// ValueSet - unique list of values.
type ValueSet map[Value]struct{}
// Add - adds given value to value set.
func (set ValueSet) Add(value Value) {
set[value] = struct{}{}
}
// MarshalJSON - encodes ValueSet to JSON data.
func (set ValueSet) MarshalJSON() ([]byte, error) {
var values []Value
for k := range set {
values = append(values, k)
}
if len(values) == 0 {
return nil, fmt.Errorf("invalid value set %v", set)
}
return json.Marshal(values)
}
// UnmarshalJSON - decodes JSON data.
func (set *ValueSet) UnmarshalJSON(data []byte) error {
var v Value
if err := json.Unmarshal(data, &v); err == nil {
*set = make(ValueSet)
set.Add(v)
return nil
}
var values []Value
if err := json.Unmarshal(data, &values); err != nil {
return err
}
if len(values) < 1 {
return fmt.Errorf("invalid value")
}
*set = make(ValueSet)
for _, v = range values {
if _, found := (*set)[v]; found {
return fmt.Errorf("duplicate value found '%v'", v)
}
set.Add(v)
}
return nil
}
// NewValueSet - returns new value set containing given values.
func NewValueSet(values ...Value) ValueSet {
set := make(ValueSet)
for _, value := range values {
set.Add(value)
}
return set
}