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v2fly/proxy/vmess/protocol/user/id.go

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package user
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import (
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"crypto/md5"
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"encoding/hex"
"errors"
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"github.com/v2ray/v2ray-core/common/log"
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)
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const (
IDBytesLen = 16
)
var (
InvalidID = errors.New("Invalid ID.")
)
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// The ID of en entity, in the form of an UUID.
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type ID struct {
String string
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Bytes [IDBytesLen]byte
cmdKey [IDBytesLen]byte
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}
func NewID(id string) (ID, error) {
idBytes, err := UUIDToID(id)
if err != nil {
log.Error("Failed to parse id %s", id)
return ID{}, InvalidID
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}
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md5hash := md5.New()
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md5hash.Write(idBytes[:])
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md5hash.Write([]byte("c48619fe-8f02-49e0-b9e9-edf763e17e21"))
cmdKey := md5.Sum(nil)
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return ID{
String: id,
Bytes: idBytes,
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cmdKey: cmdKey,
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}, nil
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}
func (v ID) CmdKey() []byte {
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return v.cmdKey[:]
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}
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var byteGroups = []int{8, 4, 4, 4, 12}
// TODO: leverage a full functional UUID library
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func UUIDToID(uuid string) (v [IDBytesLen]byte, err error) {
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text := []byte(uuid)
if len(text) < 32 {
log.Error("uuid: invalid UUID string: %s", text)
err = InvalidID
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return
}
b := v[:]
for _, byteGroup := range byteGroups {
if text[0] == '-' {
text = text[1:]
}
_, err = hex.Decode(b[:byteGroup/2], text[:byteGroup])
if err != nil {
return
}
text = text[byteGroup:]
b = b[byteGroup/2:]
}
return
}