feat: Waku v2 bridge

Issue #12610

vendor/github.com/ethereum/go-ethereum/p2p/discover/node.go

@@ -0,0 +1,97 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package discover
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"errors"
+	"math/big"
+	"net"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/p2p/enode"
+)
+
+// node represents a host on the network.
+// The fields of Node may not be modified.
+type node struct {
+	enode.Node
+	addedAt        time.Time // time when the node was added to the table
+	livenessChecks uint      // how often liveness was checked
+}
+
+type encPubkey [64]byte
+
+func encodePubkey(key *ecdsa.PublicKey) encPubkey {
+	var e encPubkey
+	math.ReadBits(key.X, e[:len(e)/2])
+	math.ReadBits(key.Y, e[len(e)/2:])
+	return e
+}
+
+func decodePubkey(curve elliptic.Curve, e []byte) (*ecdsa.PublicKey, error) {
+	if len(e) != len(encPubkey{}) {
+		return nil, errors.New("wrong size public key data")
+	}
+	p := &ecdsa.PublicKey{Curve: curve, X: new(big.Int), Y: new(big.Int)}
+	half := len(e) / 2
+	p.X.SetBytes(e[:half])
+	p.Y.SetBytes(e[half:])
+	if !p.Curve.IsOnCurve(p.X, p.Y) {
+		return nil, errors.New("invalid curve point")
+	}
+	return p, nil
+}
+
+func (e encPubkey) id() enode.ID {
+	return enode.ID(crypto.Keccak256Hash(e[:]))
+}
+
+func wrapNode(n *enode.Node) *node {
+	return &node{Node: *n}
+}
+
+func wrapNodes(ns []*enode.Node) []*node {
+	result := make([]*node, len(ns))
+	for i, n := range ns {
+		result[i] = wrapNode(n)
+	}
+	return result
+}
+
+func unwrapNode(n *node) *enode.Node {
+	return &n.Node
+}
+
+func unwrapNodes(ns []*node) []*enode.Node {
+	result := make([]*enode.Node, len(ns))
+	for i, n := range ns {
+		result[i] = unwrapNode(n)
+	}
+	return result
+}
+
+func (n *node) addr() *net.UDPAddr {
+	return &net.UDPAddr{IP: n.IP(), Port: n.UDP()}
+}
+
+func (n *node) String() string {
+	return n.Node.String()
+}