github.com/ethw3/go-ethereuma@v0.0.0-20221013053120-c14602a4c23c/cmd/devp2p/keycmd.go (about)

     1  // Copyright 2020 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // go-ethereum is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import (
    20  	"fmt"
    21  	"net"
    22  
    23  	"github.com/ethw3/go-ethereuma/crypto"
    24  	"github.com/ethw3/go-ethereuma/p2p/enode"
    25  	"github.com/urfave/cli/v2"
    26  )
    27  
    28  var (
    29  	keyCommand = &cli.Command{
    30  		Name:  "key",
    31  		Usage: "Operations on node keys",
    32  		Subcommands: []*cli.Command{
    33  			keyGenerateCommand,
    34  			keyToNodeCommand,
    35  		},
    36  	}
    37  	keyGenerateCommand = &cli.Command{
    38  		Name:      "generate",
    39  		Usage:     "Generates node key files",
    40  		ArgsUsage: "keyfile",
    41  		Action:    genkey,
    42  	}
    43  	keyToNodeCommand = &cli.Command{
    44  		Name:      "to-enode",
    45  		Usage:     "Creates an enode URL from a node key file",
    46  		ArgsUsage: "keyfile",
    47  		Action:    keyToURL,
    48  		Flags:     []cli.Flag{hostFlag, tcpPortFlag, udpPortFlag},
    49  	}
    50  )
    51  
    52  var (
    53  	hostFlag = &cli.StringFlag{
    54  		Name:  "ip",
    55  		Usage: "IP address of the node",
    56  		Value: "127.0.0.1",
    57  	}
    58  	tcpPortFlag = &cli.IntFlag{
    59  		Name:  "tcp",
    60  		Usage: "TCP port of the node",
    61  		Value: 30303,
    62  	}
    63  	udpPortFlag = &cli.IntFlag{
    64  		Name:  "udp",
    65  		Usage: "UDP port of the node",
    66  		Value: 30303,
    67  	}
    68  )
    69  
    70  func genkey(ctx *cli.Context) error {
    71  	if ctx.NArg() != 1 {
    72  		return fmt.Errorf("need key file as argument")
    73  	}
    74  	file := ctx.Args().Get(0)
    75  
    76  	key, err := crypto.GenerateKey()
    77  	if err != nil {
    78  		return fmt.Errorf("could not generate key: %v", err)
    79  	}
    80  	return crypto.SaveECDSA(file, key)
    81  }
    82  
    83  func keyToURL(ctx *cli.Context) error {
    84  	if ctx.NArg() != 1 {
    85  		return fmt.Errorf("need key file as argument")
    86  	}
    87  
    88  	var (
    89  		file = ctx.Args().Get(0)
    90  		host = ctx.String(hostFlag.Name)
    91  		tcp  = ctx.Int(tcpPortFlag.Name)
    92  		udp  = ctx.Int(udpPortFlag.Name)
    93  	)
    94  	key, err := crypto.LoadECDSA(file)
    95  	if err != nil {
    96  		return err
    97  	}
    98  	ip := net.ParseIP(host)
    99  	if ip == nil {
   100  		return fmt.Errorf("invalid IP address %q", host)
   101  	}
   102  	node := enode.NewV4(&key.PublicKey, ip, tcp, udp)
   103  	fmt.Println(node.URLv4())
   104  	return nil
   105  }