mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 04:55:31 +00:00
104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package logtail
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"crypto/sha256"
|
|
"encoding/hex"
|
|
"fmt"
|
|
)
|
|
|
|
// PrivateID represents an instance that write logs.
|
|
// Private IDs are only shared with the server when writing logs.
|
|
type PrivateID [32]byte
|
|
|
|
// Safely generate a new PrivateId for use in Config objects.
|
|
// You should persist this across runs of an instance of your app, so that
|
|
// it can append to the same log file on each run.
|
|
func NewPrivateID() (id PrivateID, err error) {
|
|
_, err = rand.Read(id[:])
|
|
if err != nil {
|
|
return PrivateID{}, err
|
|
}
|
|
// Clamping, for future use.
|
|
id[0] &= 248
|
|
id[31] = (id[31] & 127) | 64
|
|
return id, nil
|
|
}
|
|
|
|
func (id PrivateID) MarshalText() ([]byte, error) {
|
|
b := make([]byte, hex.EncodedLen(len(id)))
|
|
if i := hex.Encode(b, id[:]); i != len(b) {
|
|
return nil, fmt.Errorf("logtail.PrivateID.MarhsalText: i=%d", i)
|
|
}
|
|
return b, nil
|
|
}
|
|
|
|
func (id *PrivateID) UnmarshalText(s []byte) error {
|
|
b, err := hex.DecodeString(string(s))
|
|
if err != nil {
|
|
return fmt.Errorf("logtail.PrivateID.UnmarshalText: %v", err)
|
|
}
|
|
if len(b) != len(id) {
|
|
return fmt.Errorf("logtail.PrivateID.UnmarshalText: invalid hex length: %d", len(b))
|
|
}
|
|
copy(id[:], b)
|
|
return nil
|
|
}
|
|
|
|
func (id PrivateID) String() string {
|
|
b, err := id.MarshalText()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return string(b)
|
|
}
|
|
|
|
func (id PrivateID) Public() (pub PublicID) {
|
|
var emptyID PrivateID
|
|
if id == emptyID {
|
|
panic("invalid logtail.Public() on an empty private ID")
|
|
}
|
|
h := sha256.New()
|
|
h.Write(id[:])
|
|
if n := copy(pub[:], h.Sum(pub[:0])); n != len(pub) {
|
|
panic(fmt.Sprintf("public id short copy: %d", n))
|
|
}
|
|
return pub
|
|
}
|
|
|
|
// PublicID represents an instance in the logs service for reading and adoption.
|
|
// The public ID value is a SHA-256 hash of a private ID.
|
|
type PublicID [sha256.Size]byte
|
|
|
|
func (id PublicID) MarshalText() ([]byte, error) {
|
|
b := make([]byte, hex.EncodedLen(len(id)))
|
|
if i := hex.Encode(b, id[:]); i != len(b) {
|
|
return nil, fmt.Errorf("logtail.PublicID.MarhsalText: i=%d", i)
|
|
}
|
|
return b, nil
|
|
}
|
|
|
|
func (id *PublicID) UnmarshalText(s []byte) error {
|
|
b, err := hex.DecodeString(string(s))
|
|
if err != nil {
|
|
return fmt.Errorf("logtail.PublicID.UnmarshalText: %v", err)
|
|
}
|
|
if len(b) != len(id) {
|
|
return fmt.Errorf("logtail.PublicID.UnmarshalText: invalid hex length: %d", len(b))
|
|
}
|
|
copy(id[:], b)
|
|
return nil
|
|
}
|
|
|
|
func (id PublicID) String() string {
|
|
b, err := id.MarshalText()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return string(b)
|
|
}
|