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util.go
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util.go
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package cliutil
import (
"bytes"
"crypto/rand"
"encoding/base64"
"io"
"os"
"github.com/aperturerobotics/bifrost/keypem"
"github.com/aperturerobotics/bifrost/peer"
peer_ssh "github.com/aperturerobotics/bifrost/peer/ssh"
"github.com/aperturerobotics/bifrost/util/confparse"
"github.com/aperturerobotics/protobuf-go-lite/types/known/timestamppb"
"github.com/pkg/errors"
"github.com/urfave/cli/v2"
"golang.org/x/crypto/ssh"
)
// RunTimestamp runs the timestamp util command.
func (a *UtilArgs) RunTimestamp(_ *cli.Context) error {
var ts *timestamppb.Timestamp
if a.Timestamp != "" {
var err error
ts, err = confparse.ParseTimestamp(a.Timestamp)
if err != nil {
return err
}
} else {
ts = timestamppb.Now()
}
formatted := ts.AsRFC3339() + "\n"
return writeIfNotExists(a.OutPath, bytes.NewReader([]byte(formatted)))
}
// RunGeneratePrivate runs the generate-private util command.
func (a *UtilArgs) RunGeneratePrivate(_ *cli.Context) error {
npeer, err := peer.NewPeer(nil)
if err != nil {
return err
}
priv, err := npeer.GetPrivKey(a.GetContext())
if err != nil {
return err
}
pemd, err := keypem.MarshalPrivKeyPem(priv)
if err != nil {
return err
}
err = writeIfNotExists(a.OutPath, bytes.NewReader(pemd))
if err != nil {
return err
}
le := a.GetLogger()
le.Infof("generated private key: %s", npeer.GetPeerID().String())
return nil
}
// RunDerivePublic derives the public key from a private pem.
func (a *UtilArgs) RunDerivePublic(_ *cli.Context) error {
rp, err := a.readInputFilePrivKey()
if err != nil {
return err
}
pemd, err := keypem.MarshalPubKeyPem(rp.GetPubKey())
if err != nil {
return err
}
err = writeIfNotExists(a.OutPath, bytes.NewReader(pemd))
if err != nil {
return err
}
return nil
}
// RunDerivePublic derives the ssh public key from a private or public pem.
func (a *UtilArgs) RunDeriveSshPublic(_ *cli.Context) error {
rp, err := a.readInputFilePubKey()
if err != nil {
return err
}
pkey, err := peer_ssh.NewPublicKey(rp.GetPubKey())
if err != nil {
return err
}
dat := ssh.MarshalAuthorizedKey(pkey)
err = writeIfNotExists(a.OutPath, bytes.NewReader(dat))
if err != nil {
return err
}
return nil
}
// RunGenerateCryptoKey runs the generate-crypto-key util command.
func (a *UtilArgs) RunGenerateCryptoKey(_ *cli.Context) error {
keySize := a.KeySize
if keySize == 0 {
keySize = 32
}
buf := make([]byte, keySize)
if _, err := rand.Read(buf); err != nil {
return err
}
bufB64 := base64.StdEncoding.EncodeToString(buf) + "\n"
err := writeIfNotExists(a.OutPath, bytes.NewReader([]byte(bufB64)))
if err != nil {
return err
}
le := a.GetLogger()
le.Infof("generated crypto key of length %v", keySize)
return nil
}
// readInputFile reads the input file path or stdin.
func (a *UtilArgs) readInputFile() ([]byte, error) {
if fp := a.FilePath; fp != "" {
return os.ReadFile(fp)
}
return io.ReadAll(os.Stdin)
}
// readInputFilePrivKey reads the input file path or stdin.
func (a *UtilArgs) readInputFilePrivKey() (peer.Peer, error) {
dat, err := a.readInputFile()
if err != nil {
return nil, err
}
key, err := keypem.ParsePrivKeyPem(dat)
if err != nil {
return nil, err
}
le := a.GetLogger()
npeer, err := peer.NewPeer(key)
if err != nil {
return nil, err
}
le.Debugf("loaded private key: %s", npeer.GetPeerID().String())
return npeer, nil
}
// readInputFilePubKey reads the input file path or stdin.
func (a *UtilArgs) readInputFilePubKey() (peer.Peer, error) {
dat, err := a.readInputFile()
if err != nil {
return nil, err
}
key, err := keypem.ParsePubKeyPem(dat)
if err != nil {
return nil, err
}
le := a.GetLogger()
npeer, err := peer.NewPeerWithPubKey(key)
if err != nil {
return nil, err
}
le.Debugf("loaded public key: %s", npeer.GetPeerID().String())
return npeer, nil
}
func writeIfNotExists(outPath string, input io.Reader) error {
var of *os.File
var out io.Writer
if outPath != "" {
_, err := os.Stat(outPath)
if !os.IsNotExist(err) {
return errors.Wrap(os.ErrExist, outPath)
}
of, err = os.OpenFile(outPath, os.O_CREATE|os.O_RDWR, 0o600)
if err != nil {
return err
}
out = of
defer of.Close()
if pos, err := of.Seek(0, io.SeekEnd); err != nil || pos != 0 {
if err == nil {
// file must have existed
return errors.Wrap(os.ErrExist, outPath)
}
return err
}
} else {
out = os.Stdout
}
if _, err := io.Copy(out, input); err != nil {
return err
}
if of != nil {
return of.Close()
}
return nil
}