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package p2p
import (
"encoding/hex"
"io/ioutil"
"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"
)
// ID is a hex-encoded crypto.Address
type ID string
// IDByteLength is the length of a crypto.Address. Currently only 20.
// TODO: support other length addresses ?
const IDByteLength = crypto.AddressSize
//------------------------------------------------------------------------------
// Persistent peer ID
// TODO: encrypt on disk
// NodeKey is the persistent peer key.
// It contains the nodes private key for authentication.
type NodeKey struct {
PrivKey crypto.PrivKey `json:"priv_key"` // our priv key
}
// ID returns the peer's canonical ID - the hash of its public key.
func (nodeKey *NodeKey) ID() ID {
return PubKeyToID(nodeKey.PubKey())
}
// PubKey returns the peer's PubKey
func (nodeKey *NodeKey) PubKey() crypto.PubKey {
return nodeKey.PrivKey.PubKey()
}
// PubKeyToID returns the ID corresponding to the given PubKey.
// It's the hex-encoding of the pubKey.Address().
func PubKeyToID(pubKey crypto.PubKey) ID {
return ID(hex.EncodeToString(pubKey.Address()))
}
// 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 nil, err
}
return nodeKey, nil
}
privKey := ed25519.GenPrivKey()
nodeKey := &NodeKey{
PrivKey: privKey,
}
if err := nodeKey.SaveAs(filePath); err != nil {
return nil, err
}
return nodeKey, nil
}
// LoadNodeKey loads NodeKey located in filePath.
func LoadNodeKey(filePath string) (*NodeKey, error) {
jsonBytes, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, err
}
nodeKey := new(NodeKey)
err = tmjson.Unmarshal(jsonBytes, nodeKey)
if err != nil {
return nil, err
}
return nodeKey, nil
}
// 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
}