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address.go
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address.go
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// Copyright 2020 The Penguin 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 pen exposes the data structure and operations
// necessary on the pen.Address type which used in the handshake
// protocol, address-book and hive protocol.
package pen
import (
"bytes"
"encoding/base64"
"encoding/binary"
"encoding/json"
"errors"
"fmt"
"github.com/penguintop/penguin/pkg/crypto"
"github.com/penguintop/penguin/pkg/penguin"
ma "github.com/multiformats/go-multiaddr"
)
var ErrInvalidAddress = errors.New("invalid address")
// Address represents the pen address in penguin.
// It consists of a peers underlay (physical) address, overlay (topology) address and signature.
// Signature is used to verify the `Overlay/Underlay` pair, as it is based on `underlay|networkID`, signed with the public key of Overlay address
type Address struct {
Underlay ma.Multiaddr
Overlay penguin.Address
Signature []byte
}
type addressJSON struct {
Overlay string `json:"overlay"`
Underlay string `json:"underlay"`
Signature string `json:"signature"`
}
func NewAddress(signer crypto.Signer, underlay ma.Multiaddr, overlay penguin.Address, networkID uint64) (*Address, error) {
underlayBinary, err := underlay.MarshalBinary()
if err != nil {
return nil, err
}
signature, err := signer.Sign(generateSignData(underlayBinary, overlay.Bytes(), networkID))
if err != nil {
return nil, err
}
return &Address{
Underlay: underlay,
Overlay: overlay,
Signature: signature,
}, nil
}
func ParseAddress(underlay, overlay, signature []byte, networkID uint64) (*Address, error) {
recoveredPK, err := crypto.Recover(signature, generateSignData(underlay, overlay, networkID))
if err != nil {
return nil, ErrInvalidAddress
}
recoveredOverlay, err := crypto.NewOverlayAddress(*recoveredPK, networkID)
if err != nil {
return nil, ErrInvalidAddress
}
if !bytes.Equal(recoveredOverlay.Bytes(), overlay) {
return nil, ErrInvalidAddress
}
multiUnderlay, err := ma.NewMultiaddrBytes(underlay)
if err != nil {
return nil, ErrInvalidAddress
}
return &Address{
Underlay: multiUnderlay,
Overlay: penguin.NewAddress(overlay),
Signature: signature,
}, nil
}
func generateSignData(underlay, overlay []byte, networkID uint64) []byte {
networkIDBytes := make([]byte, 8)
binary.BigEndian.PutUint64(networkIDBytes, networkID)
signData := append([]byte("pen-handshake-"), underlay...)
signData = append(signData, overlay...)
return append(signData, networkIDBytes...)
}
func (a *Address) Equal(b *Address) bool {
return a.Overlay.Equal(b.Overlay) && a.Underlay.Equal(b.Underlay) && bytes.Equal(a.Signature, b.Signature)
}
func (a *Address) MarshalJSON() ([]byte, error) {
return json.Marshal(&addressJSON{
Overlay: a.Overlay.String(),
Underlay: a.Underlay.String(),
Signature: base64.StdEncoding.EncodeToString(a.Signature),
})
}
func (a *Address) UnmarshalJSON(b []byte) error {
v := &addressJSON{}
err := json.Unmarshal(b, v)
if err != nil {
return err
}
addr, err := penguin.ParseHexAddress(v.Overlay)
if err != nil {
return err
}
a.Overlay = addr
m, err := ma.NewMultiaddr(v.Underlay)
if err != nil {
return err
}
a.Underlay = m
a.Signature, err = base64.StdEncoding.DecodeString(v.Signature)
return err
}
func (a *Address) String() string {
return fmt.Sprintf("[Underlay: %v, Overlay %v, Signature %x]", a.Underlay, a.Overlay, a.Signature)
}
// ShortString returns shortened versions of pen address in a format: [Overlay, Underlay]
// It can be used for logging
func (a *Address) ShortString() string {
return fmt.Sprintf("[Overlay: %s, Underlay: %s]", a.Overlay.String(), a.Underlay.String())
}