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127 lines
3.2 KiB
127 lines
3.2 KiB
package p2p
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import (
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"encoding/hex"
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"errors"
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"fmt"
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"io/ioutil"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/crypto/ed25519"
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tmjson "github.com/tendermint/tendermint/libs/json"
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tmos "github.com/tendermint/tendermint/libs/os"
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)
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// NodeID is a hex-encoded crypto.Address.
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// FIXME: We should either ensure this is always lowercased, or add an Equal()
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// for comparison that decodes to the binary byte slice first.
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type NodeID string
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// NodeIDByteLength is the length of a crypto.Address. Currently only 20.
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// FIXME: support other length addresses?
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const NodeIDByteLength = crypto.AddressSize
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// NodeIDFromPubKey returns the noe ID corresponding to the given PubKey. It's
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// the hex-encoding of the pubKey.Address().
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func NodeIDFromPubKey(pubKey crypto.PubKey) NodeID {
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return NodeID(hex.EncodeToString(pubKey.Address()))
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}
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// Bytes converts the node ID to it's binary byte representation.
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func (id NodeID) Bytes() ([]byte, error) {
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bz, err := hex.DecodeString(string(id))
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if err != nil {
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return nil, fmt.Errorf("invalid node ID encoding: %w", err)
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}
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return bz, nil
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}
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// Validate validates the NodeID.
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func (id NodeID) Validate() error {
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if len(id) == 0 {
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return errors.New("no ID")
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}
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bz, err := id.Bytes()
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if err != nil {
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return err
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}
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if len(bz) != NodeIDByteLength {
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return fmt.Errorf("invalid ID length - got %d, expected %d", len(bz), NodeIDByteLength)
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}
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return nil
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}
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//------------------------------------------------------------------------------
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// Persistent peer ID
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// TODO: encrypt on disk
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// NodeKey is the persistent peer key.
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// It contains the nodes private key for authentication.
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type NodeKey struct {
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// Canonical ID - hex-encoded pubkey's address (IDByteLength bytes)
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ID NodeID `json:"id"`
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// Private key
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PrivKey crypto.PrivKey `json:"priv_key"`
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}
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// PubKey returns the peer's PubKey
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func (nodeKey NodeKey) PubKey() crypto.PubKey {
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return nodeKey.PrivKey.PubKey()
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}
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// SaveAs persists the NodeKey to filePath.
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func (nodeKey NodeKey) SaveAs(filePath string) error {
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jsonBytes, err := tmjson.Marshal(nodeKey)
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if err != nil {
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return err
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}
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err = ioutil.WriteFile(filePath, jsonBytes, 0600)
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if err != nil {
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return err
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}
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return nil
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}
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// LoadOrGenNodeKey attempts to load the NodeKey from the given filePath. If
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// the file does not exist, it generates and saves a new NodeKey.
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func LoadOrGenNodeKey(filePath string) (NodeKey, error) {
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if tmos.FileExists(filePath) {
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nodeKey, err := LoadNodeKey(filePath)
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if err != nil {
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return NodeKey{}, err
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}
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return nodeKey, nil
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}
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nodeKey := GenNodeKey()
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if err := nodeKey.SaveAs(filePath); err != nil {
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return NodeKey{}, err
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}
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return nodeKey, nil
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}
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// GenNodeKey generates a new node key.
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func GenNodeKey() NodeKey {
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privKey := ed25519.GenPrivKey()
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return NodeKey{
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ID: NodeIDFromPubKey(privKey.PubKey()),
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PrivKey: privKey,
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}
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}
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// LoadNodeKey loads NodeKey located in filePath.
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func LoadNodeKey(filePath string) (NodeKey, error) {
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jsonBytes, err := ioutil.ReadFile(filePath)
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if err != nil {
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return NodeKey{}, err
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}
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nodeKey := NodeKey{}
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err = tmjson.Unmarshal(jsonBytes, &nodeKey)
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if err != nil {
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return NodeKey{}, err
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}
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nodeKey.ID = NodeIDFromPubKey(nodeKey.PubKey())
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return nodeKey, nil
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}
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