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Copy pathprincipal.go
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92 lines (75 loc) · 2.27 KB
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/*
* 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 policy
import (
"encoding/json"
"fmt"
"github.com/minio/minio-go/pkg/set"
"github.com/minio/minio/pkg/wildcard"
)
// Principal - policy principal.
type Principal struct {
AWS set.StringSet
}
// IsValid - checks whether Principal is valid or not.
func (p Principal) IsValid() bool {
return len(p.AWS) != 0
}
// Intersection - returns principals available in both Principal.
func (p Principal) Intersection(principal Principal) set.StringSet {
return p.AWS.Intersection(principal.AWS)
}
// MarshalJSON - encodes Principal to JSON data.
func (p Principal) MarshalJSON() ([]byte, error) {
if !p.IsValid() {
return nil, fmt.Errorf("invalid principal %v", p)
}
// subtype to avoid recursive call to MarshalJSON()
type subPrincipal Principal
sp := subPrincipal(p)
return json.Marshal(sp)
}
// Match - matches given principal is wildcard matching with Principal.
func (p Principal) Match(principal string) bool {
for _, pattern := range p.AWS.ToSlice() {
if wildcard.MatchSimple(pattern, principal) {
return true
}
}
return false
}
// UnmarshalJSON - decodes JSON data to Principal.
func (p *Principal) UnmarshalJSON(data []byte) error {
// subtype to avoid recursive call to UnmarshalJSON()
type subPrincipal Principal
var sp subPrincipal
if err := json.Unmarshal(data, &sp); err != nil {
var s string
if err = json.Unmarshal(data, &s); err != nil {
return err
}
if s != "*" {
return fmt.Errorf("invalid principal '%v'", s)
}
sp.AWS = set.CreateStringSet("*")
}
*p = Principal(sp)
return nil
}
// NewPrincipal - creates new Principal.
func NewPrincipal(principals ...string) Principal {
return Principal{AWS: set.CreateStringSet(principals...)}
}