mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-17 18:13:30 +02:00
354 lines
8.3 KiB
Go
354 lines
8.3 KiB
Go
|
// Copyright (C) 2013 by Maxim Bublis <b@codemonkey.ru>
|
||
|
//
|
||
|
// Permission is hereby granted, free of charge, to any person obtaining
|
||
|
// a copy of this software and associated documentation files (the
|
||
|
// "Software"), to deal in the Software without restriction, including
|
||
|
// without limitation the rights to use, copy, modify, merge, publish,
|
||
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
||
|
// permit persons to whom the Software is furnished to do so, subject to
|
||
|
// the following conditions:
|
||
|
//
|
||
|
// The above copyright notice and this permission notice shall be
|
||
|
// included in all copies or substantial portions of the Software.
|
||
|
//
|
||
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
||
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
||
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
||
|
// Package uuid provides implementation of Universally Unique Identifier (UUID).
|
||
|
// Supported versions are 1, 3, 4 and 5 (as specified in RFC 4122) and
|
||
|
// version 2 (as specified in DCE 1.1).
|
||
|
package uuid
|
||
|
|
||
|
import (
|
||
|
"bytes"
|
||
|
"crypto/md5"
|
||
|
"crypto/rand"
|
||
|
"crypto/sha1"
|
||
|
"encoding/binary"
|
||
|
"encoding/hex"
|
||
|
"fmt"
|
||
|
"hash"
|
||
|
"net"
|
||
|
"os"
|
||
|
"strings"
|
||
|
"sync"
|
||
|
"time"
|
||
|
)
|
||
|
|
||
|
// UUID layout variants.
|
||
|
const (
|
||
|
VariantNCS = iota
|
||
|
VariantRFC4122
|
||
|
VariantMicrosoft
|
||
|
VariantFuture
|
||
|
)
|
||
|
|
||
|
// UUID DCE domains.
|
||
|
const (
|
||
|
DomainPerson = iota
|
||
|
DomainGroup
|
||
|
DomainOrg
|
||
|
)
|
||
|
|
||
|
// Difference in 100-nanosecond intervals between
|
||
|
// UUID epoch (October 15, 1582) and Unix epoch (January 1, 1970).
|
||
|
const epochStart = 122192928000000000
|
||
|
|
||
|
// UUID v1/v2 storage.
|
||
|
var (
|
||
|
storageMutex sync.Mutex
|
||
|
clockSequence uint16
|
||
|
lastTime uint64
|
||
|
hardwareAddr [6]byte
|
||
|
posixUID = uint32(os.Getuid())
|
||
|
posixGID = uint32(os.Getgid())
|
||
|
)
|
||
|
|
||
|
// Epoch calculation function
|
||
|
var epochFunc func() uint64
|
||
|
|
||
|
// Initialize storage
|
||
|
func init() {
|
||
|
buf := make([]byte, 2)
|
||
|
rand.Read(buf)
|
||
|
clockSequence = binary.BigEndian.Uint16(buf)
|
||
|
|
||
|
// Initialize hardwareAddr randomly in case
|
||
|
// of real network interfaces absence
|
||
|
rand.Read(hardwareAddr[:])
|
||
|
|
||
|
// Set multicast bit as recommended in RFC 4122
|
||
|
hardwareAddr[0] |= 0x01
|
||
|
|
||
|
interfaces, err := net.Interfaces()
|
||
|
if err == nil {
|
||
|
for _, iface := range interfaces {
|
||
|
if len(iface.HardwareAddr) >= 6 {
|
||
|
copy(hardwareAddr[:], iface.HardwareAddr)
|
||
|
break
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
epochFunc = unixTimeFunc
|
||
|
}
|
||
|
|
||
|
// Returns difference in 100-nanosecond intervals between
|
||
|
// UUID epoch (October 15, 1582) and current time.
|
||
|
// This is default epoch calculation function.
|
||
|
func unixTimeFunc() uint64 {
|
||
|
return epochStart + uint64(time.Now().UnixNano()/100)
|
||
|
}
|
||
|
|
||
|
// UUID representation compliant with specification
|
||
|
// described in RFC 4122.
|
||
|
type UUID [16]byte
|
||
|
|
||
|
// Predefined namespace UUIDs.
|
||
|
var (
|
||
|
NamespaceDNS, _ = FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
|
||
|
NamespaceURL, _ = FromString("6ba7b811-9dad-11d1-80b4-00c04fd430c8")
|
||
|
NamespaceOID, _ = FromString("6ba7b812-9dad-11d1-80b4-00c04fd430c8")
|
||
|
NamespaceX500, _ = FromString("6ba7b814-9dad-11d1-80b4-00c04fd430c8")
|
||
|
)
|
||
|
|
||
|
// And returns result of binary AND of two UUIDs.
|
||
|
func And(u1 UUID, u2 UUID) UUID {
|
||
|
u := UUID{}
|
||
|
for i := 0; i < 16; i++ {
|
||
|
u[i] = u1[i] & u2[i]
|
||
|
}
|
||
|
return u
|
||
|
}
|
||
|
|
||
|
// Or returns result of binary OR of two UUIDs.
|
||
|
func Or(u1 UUID, u2 UUID) UUID {
|
||
|
u := UUID{}
|
||
|
for i := 0; i < 16; i++ {
|
||
|
u[i] = u1[i] | u2[i]
|
||
|
}
|
||
|
return u
|
||
|
}
|
||
|
|
||
|
// Equal returns true if u1 and u2 equals, otherwise returns false.
|
||
|
func Equal(u1 UUID, u2 UUID) bool {
|
||
|
return bytes.Equal(u1[:], u2[:])
|
||
|
}
|
||
|
|
||
|
// Version returns algorithm version used to generate UUID.
|
||
|
func (u UUID) Version() uint {
|
||
|
return uint(u[6] >> 4)
|
||
|
}
|
||
|
|
||
|
// Variant returns UUID layout variant.
|
||
|
func (u UUID) Variant() uint {
|
||
|
switch {
|
||
|
case (u[8] & 0x80) == 0x00:
|
||
|
return VariantNCS
|
||
|
case (u[8]&0xc0)|0x80 == 0x80:
|
||
|
return VariantRFC4122
|
||
|
case (u[8]&0xe0)|0xc0 == 0xc0:
|
||
|
return VariantMicrosoft
|
||
|
}
|
||
|
return VariantFuture
|
||
|
}
|
||
|
|
||
|
// Bytes returns bytes slice representation of UUID.
|
||
|
func (u UUID) Bytes() []byte {
|
||
|
return u[:]
|
||
|
}
|
||
|
|
||
|
// Returns canonical string representation of UUID:
|
||
|
// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
|
||
|
func (u UUID) String() string {
|
||
|
return fmt.Sprintf("%x-%x-%x-%x-%x",
|
||
|
u[:4], u[4:6], u[6:8], u[8:10], u[10:])
|
||
|
}
|
||
|
|
||
|
// SetVersion sets version bits.
|
||
|
func (u *UUID) SetVersion(v byte) {
|
||
|
u[6] = (u[6] & 0x0f) | (v << 4)
|
||
|
}
|
||
|
|
||
|
// SetVariant sets variant bits as described in RFC 4122.
|
||
|
func (u *UUID) SetVariant() {
|
||
|
u[8] = (u[8] & 0xbf) | 0x80
|
||
|
}
|
||
|
|
||
|
// MarshalText implements the encoding.TextMarshaler interface.
|
||
|
// The encoding is the same as returned by String.
|
||
|
func (u UUID) MarshalText() (text []byte, err error) {
|
||
|
text = []byte(u.String())
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// UnmarshalText implements the encoding.TextUnmarshaler interface.
|
||
|
// UUID is expected in a form accepted by FromString.
|
||
|
func (u *UUID) UnmarshalText(text []byte) error {
|
||
|
s := string(text)
|
||
|
u2, err := FromString(s)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
*u = u2
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
// MarshalBinary implements the encoding.BinaryMarshaler interface.
|
||
|
func (u UUID) MarshalBinary() (data []byte, err error) {
|
||
|
data = u.Bytes()
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
|
||
|
func (u *UUID) UnmarshalBinary(data []byte) error {
|
||
|
u2, err := FromBytes(data)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
*u = u2
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
// FromBytes returns UUID converted from raw byte slice input.
|
||
|
// It will return error if the slice isn't 16 bytes long.
|
||
|
func FromBytes(input []byte) (u UUID, err error) {
|
||
|
if len(input) != 16 {
|
||
|
err = fmt.Errorf("uuid: UUID must be exactly 16 bytes long, got %d bytes", len(input))
|
||
|
return
|
||
|
}
|
||
|
|
||
|
copy(u[:], input)
|
||
|
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// FromString returns UUID parsed from string input.
|
||
|
// Following formats are supported:
|
||
|
// "6ba7b810-9dad-11d1-80b4-00c04fd430c8",
|
||
|
// "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}",
|
||
|
// "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8"
|
||
|
func FromString(input string) (u UUID, err error) {
|
||
|
s := strings.Replace(input, "-", "", -1)
|
||
|
|
||
|
if len(s) == 41 && s[:9] == "urn:uuid:" {
|
||
|
s = s[9:]
|
||
|
} else if len(s) == 34 && s[0] == '{' && s[33] == '}' {
|
||
|
s = s[1:33]
|
||
|
}
|
||
|
|
||
|
if len(s) != 32 {
|
||
|
err = fmt.Errorf("uuid: invalid UUID string: %s", input)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
b := []byte(s)
|
||
|
_, err = hex.Decode(u[:], b)
|
||
|
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Returns UUID v1/v2 storage state.
|
||
|
// Returns epoch timestamp and clock sequence.
|
||
|
func getStorage() (uint64, uint16) {
|
||
|
storageMutex.Lock()
|
||
|
defer storageMutex.Unlock()
|
||
|
|
||
|
timeNow := epochFunc()
|
||
|
// Clock changed backwards since last UUID generation.
|
||
|
// Should increase clock sequence.
|
||
|
if timeNow <= lastTime {
|
||
|
clockSequence++
|
||
|
}
|
||
|
lastTime = timeNow
|
||
|
|
||
|
return timeNow, clockSequence
|
||
|
}
|
||
|
|
||
|
// NewV1 returns UUID based on current timestamp and MAC address.
|
||
|
func NewV1() UUID {
|
||
|
u := UUID{}
|
||
|
|
||
|
timeNow, clockSeq := getStorage()
|
||
|
|
||
|
binary.BigEndian.PutUint32(u[0:], uint32(timeNow))
|
||
|
binary.BigEndian.PutUint16(u[4:], uint16(timeNow>>32))
|
||
|
binary.BigEndian.PutUint16(u[6:], uint16(timeNow>>48))
|
||
|
binary.BigEndian.PutUint16(u[8:], clockSeq)
|
||
|
|
||
|
copy(u[10:], hardwareAddr[:])
|
||
|
|
||
|
u.SetVersion(1)
|
||
|
u.SetVariant()
|
||
|
|
||
|
return u
|
||
|
}
|
||
|
|
||
|
// NewV2 returns DCE Security UUID based on POSIX UID/GID.
|
||
|
func NewV2(domain byte) UUID {
|
||
|
u := UUID{}
|
||
|
|
||
|
switch domain {
|
||
|
case DomainPerson:
|
||
|
binary.BigEndian.PutUint32(u[0:], posixUID)
|
||
|
case DomainGroup:
|
||
|
binary.BigEndian.PutUint32(u[0:], posixGID)
|
||
|
}
|
||
|
|
||
|
timeNow, clockSeq := getStorage()
|
||
|
|
||
|
binary.BigEndian.PutUint16(u[4:], uint16(timeNow>>32))
|
||
|
binary.BigEndian.PutUint16(u[6:], uint16(timeNow>>48))
|
||
|
binary.BigEndian.PutUint16(u[8:], clockSeq)
|
||
|
u[9] = domain
|
||
|
|
||
|
copy(u[10:], hardwareAddr[:])
|
||
|
|
||
|
u.SetVersion(2)
|
||
|
u.SetVariant()
|
||
|
|
||
|
return u
|
||
|
}
|
||
|
|
||
|
// NewV3 returns UUID based on MD5 hash of namespace UUID and name.
|
||
|
func NewV3(ns UUID, name string) UUID {
|
||
|
u := newFromHash(md5.New(), ns, name)
|
||
|
u.SetVersion(3)
|
||
|
u.SetVariant()
|
||
|
|
||
|
return u
|
||
|
}
|
||
|
|
||
|
// NewV4 returns random generated UUID.
|
||
|
func NewV4() UUID {
|
||
|
u := UUID{}
|
||
|
rand.Read(u[:])
|
||
|
u.SetVersion(4)
|
||
|
u.SetVariant()
|
||
|
|
||
|
return u
|
||
|
}
|
||
|
|
||
|
// NewV5 returns UUID based on SHA-1 hash of namespace UUID and name.
|
||
|
func NewV5(ns UUID, name string) UUID {
|
||
|
u := newFromHash(sha1.New(), ns, name)
|
||
|
u.SetVersion(5)
|
||
|
u.SetVariant()
|
||
|
|
||
|
return u
|
||
|
}
|
||
|
|
||
|
// Returns UUID based on hashing of namespace UUID and name.
|
||
|
func newFromHash(h hash.Hash, ns UUID, name string) UUID {
|
||
|
u := UUID{}
|
||
|
h.Write(ns[:])
|
||
|
h.Write([]byte(name))
|
||
|
copy(u[:], h.Sum(nil))
|
||
|
|
||
|
return u
|
||
|
}
|