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package p2p
import (
"encoding/hex"
"errors"
"fmt"
"io/ioutil"
"strings"
"github.com/tendermint/tendermint/crypto"
"github.com/tendermint/tendermint/crypto/ed25519"
tmjson "github.com/tendermint/tendermint/libs/json"
tmos "github.com/tendermint/tendermint/libs/os"
)
// NodeIDByteLength is the length of a crypto.Address. Currently only 20.
// FIXME: support other length addresses?
const NodeIDByteLength = crypto.AddressSize
// NodeID is a hex-encoded crypto.Address.
type NodeID string
// NewNodeID returns a lowercased (normalized) NodeID.
func NewNodeID(nodeID string) (NodeID, error) {
if _, err := NodeID(nodeID).Bytes(); err != nil {
return NodeID(""), err
}
return NodeID(strings.ToLower(nodeID)), nil
}
// NodeIDFromPubKey returns the noe ID corresponding to the given PubKey. It's
// the hex-encoding of the pubKey.Address().
func NodeIDFromPubKey(pubKey crypto.PubKey) NodeID {
return NodeID(hex.EncodeToString(pubKey.Address()))
}
// Bytes converts the node ID to it's binary byte representation.
func (id NodeID) Bytes() ([]byte, error) {
bz, err := hex.DecodeString(string(id))
if err != nil {
return nil, fmt.Errorf("invalid node ID encoding: %w", err)
}
return bz, nil
}
// Validate validates the NodeID.
func (id NodeID) Validate() error {
if len(id) == 0 {
return errors.New("empty node ID")
}
bz, err := id.Bytes()
if err != nil {
return err
}
if len(bz) != NodeIDByteLength {
return fmt.Errorf("invalid node ID length; got %d, expected %d", len(bz), NodeIDByteLength)
}
idStr := string(id)
if strings.ToLower(idStr) != idStr {
return fmt.Errorf("invalid node ID; must be lowercased")
}
return nil
}
//------------------------------------------------------------------------------
// Persistent peer ID
// TODO: encrypt on disk
// NodeKey is the persistent peer key.
// It contains the nodes private key for authentication.
type NodeKey struct {
// Canonical ID - hex-encoded pubkey's address (IDByteLength bytes)
ID NodeID `json:"id"`
// Private key
PrivKey crypto.PrivKey `json:"priv_key"`
}
// PubKey returns the peer's PubKey
func (nodeKey NodeKey) PubKey() crypto.PubKey {
return nodeKey.PrivKey.PubKey()
}
// SaveAs persists the NodeKey to filePath.
func (nodeKey NodeKey) SaveAs(filePath string) error {
jsonBytes, err := tmjson.Marshal(nodeKey)
if err != nil {
return err
}
err = ioutil.WriteFile(filePath, jsonBytes, 0600)
if err != nil {
return err
}
return nil
}
// LoadOrGenNodeKey attempts to load the NodeKey from the given filePath. If
// the file does not exist, it generates and saves a new NodeKey.
func LoadOrGenNodeKey(filePath string) (NodeKey, error) {
if tmos.FileExists(filePath) {
nodeKey, err := LoadNodeKey(filePath)
if err != nil {
return NodeKey{}, err
}
return nodeKey, nil
}
nodeKey := GenNodeKey()
if err := nodeKey.SaveAs(filePath); err != nil {
return NodeKey{}, err
}
return nodeKey, nil
}
// GenNodeKey generates a new node key.
func GenNodeKey() NodeKey {
privKey := ed25519.GenPrivKey()
return NodeKey{
ID: NodeIDFromPubKey(privKey.PubKey()),
PrivKey: privKey,
}
}
// LoadNodeKey loads NodeKey located in filePath.
func LoadNodeKey(filePath string) (NodeKey, error) {
jsonBytes, err := ioutil.ReadFile(filePath)
if err != nil {
return NodeKey{}, err
}
nodeKey := NodeKey{}
err = tmjson.Unmarshal(jsonBytes, &nodeKey)
if err != nil {
return NodeKey{}, err
}
nodeKey.ID = NodeIDFromPubKey(nodeKey.PubKey())
return nodeKey, nil
}