/*

* 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"

)

// Effect - policy statement effect Allow or Deny.

type Effect string

const (

// Allow - allow effect.

Allow Effect = "Allow"

// Deny - deny effect.

Deny = "Deny"

)

// IsAllowed - returns if given check is allowed or not.

func (effect Effect) IsAllowed(b bool) bool {

if effect == Allow {

return b

}

return !b

}

// IsValid - checks if Effect is valid or not

func (effect Effect) IsValid() bool {

switch effect {

case Allow, Deny:

return true

}

return false

}

// MarshalJSON - encodes Effect to JSON data.

func (effect Effect) MarshalJSON() ([]byte, error) {

if !effect.IsValid() {

return nil, fmt.Errorf("invalid effect '%v'", effect)

}

return json.Marshal(string(effect))

}

// UnmarshalJSON - decodes JSON data to Effect.

func (effect *Effect) UnmarshalJSON(data []byte) error {

var s string

if err := json.Unmarshal(data, &s); err != nil {

return err

}

e := Effect(s)

if !e.IsValid() {

return fmt.Errorf("invalid effect '%v'", s)

}

*effect = e

return nil

}