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// Copyright 2015 The appc Authors
//
// 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 types
import (
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"reflect"
"strings"
)
var (
ErrNoEmptyUUID = errors.New("UUID cannot be empty")
)
// UUID encodes an RFC4122-compliant UUID, marshaled to/from a string
// TODO(jonboulle): vendor a package for this?
// TODO(jonboulle): consider more flexibility in input string formats.
// Right now, we only accept:
// "6733C088-A507-4694-AABF-EDBE4FC5266F"
// "6733C088A5074694AABFEDBE4FC5266F"
type UUID [16]byte
func (u UUID) String() string {
return fmt.Sprintf("%x-%x-%x-%x-%x", u[0:4], u[4:6], u[6:8], u[8:10], u[10:16])
}
func (u *UUID) Set(s string) error {
nu, err := NewUUID(s)
if err == nil {
*u = *nu
}
return err
}
// NewUUID generates a new UUID from the given string. If the string does not
// represent a valid UUID, nil and an error are returned.
func NewUUID(s string) (*UUID, error) {
s = strings.Replace(s, "-", "", -1)
if len(s) != 32 {
return nil, errors.New("bad UUID length != 32")
}
dec, err := hex.DecodeString(s)
if err != nil {
return nil, err
}
var u UUID
for i, b := range dec {
u[i] = b
}
return &u, nil
}
func (u UUID) Empty() bool {
return reflect.DeepEqual(u, UUID{})
}
func (u *UUID) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
uu, err := NewUUID(s)
if uu.Empty() {
return ErrNoEmptyUUID
}
if err == nil {
*u = *uu
}
return err
}
func (u UUID) MarshalJSON() ([]byte, error) {
if u.Empty() {
return nil, ErrNoEmptyUUID
}
return json.Marshal(u.String())
}
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