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token.go
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token.go
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package tokens
import (
"bytes"
"crypto/ed25519"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"encoding/json"
"errors"
"io"
"github.com/lestrrat-go/jwx/jwa"
"github.com/lestrrat-go/jwx/jws"
"github.com/rancher/opni/pkg/core"
)
var ErrMalformedToken = errors.New("malformed token")
type Token struct {
ID []byte `json:"id"` // bytes 0-5
Secret []byte `json:"secret,omitempty"` // bytes 6-31
}
// Creates a new token by reading bytes from the given random source.
// the default source is crypto/rand.Reader.
func NewToken(source ...io.Reader) *Token {
entropy := rand.Reader
if len(source) > 0 {
entropy = source[0]
}
buf := make([]byte, 256)
if _, err := io.ReadFull(entropy, buf); err != nil {
panic(err)
}
sum := sha256.Sum256(buf)
return &Token{
ID: sum[:6],
Secret: sum[6:],
}
}
func (t *Token) EncodeJSON() []byte {
data, err := json.Marshal(t)
if err != nil {
panic(err)
}
return data
}
func (t *Token) EncodeHex() string {
return hex.EncodeToString(t.ID) + "." + hex.EncodeToString(t.Secret)
}
func (t *Token) HexID() string {
return hex.EncodeToString(t.ID)
}
func (t *Token) HexSecret() string {
return hex.EncodeToString(t.Secret)
}
func (t *Token) Reference() *core.Reference {
return &core.Reference{
Id: t.HexID(),
}
}
func ParseJSON(data []byte) (*Token, error) {
t := &Token{}
if err := json.Unmarshal(data, t); err != nil {
return nil, err
}
return t, nil
}
func ParseHex(str string) (*Token, error) {
parts := bytes.Split([]byte(str), []byte("."))
if len(parts) != 2 ||
len(parts[0]) != hex.EncodedLen(6) ||
len(parts[1]) != hex.EncodedLen(26) {
return nil, ErrMalformedToken
}
t := &Token{
ID: make([]byte, 6),
Secret: make([]byte, 26),
}
if n, err := hex.Decode(t.ID, parts[0]); err != nil || n != 6 {
return nil, ErrMalformedToken
}
if n, err := hex.Decode(t.Secret, parts[1]); err != nil || n != 26 {
return nil, ErrMalformedToken
}
return t, nil
}
// Signs the token and returns a JWS with the payload detached
func (t *Token) SignDetached(key interface{}) ([]byte, error) {
if _, ok := key.(ed25519.PrivateKey); !ok {
return nil, errors.New("invalid key type, expected ed25519.PrivateKey")
}
jsonData, err := json.Marshal(t)
if err != nil {
return nil, err
}
sig, err := jws.Sign(jsonData, jwa.EdDSA, key)
if err != nil {
return nil, err
}
firstIndex := bytes.IndexByte(sig, '.')
lastIndex := bytes.LastIndexByte(sig, '.')
buf := new(bytes.Buffer)
buf.Write(sig[:firstIndex+1])
buf.Write(sig[lastIndex:])
return buf.Bytes(), nil
}
// Verifies a JWS with a detached signature. If the signature is valid,
// also returns the complete message with re-attached payload.
func (t *Token) VerifyDetached(sig []byte, key interface{}) ([]byte, error) {
jsonData, err := json.Marshal(t)
if err != nil {
return nil, err
}
firstIndex := bytes.IndexByte(sig, '.')
lastIndex := bytes.LastIndexByte(sig, '.')
if firstIndex == -1 || lastIndex == -1 {
return nil, ErrMalformedToken
}
payload := base64.RawURLEncoding.EncodeToString(jsonData)
buf := new(bytes.Buffer)
buf.Write(sig[:firstIndex+1])
buf.WriteString(payload)
buf.Write(sig[lastIndex:])
fullToken := buf.Bytes()
cloned := make([]byte, len(fullToken))
copy(cloned, fullToken)
_, err = jws.Verify(cloned, jwa.EdDSA, key)
if err != nil {
return nil, err
}
return fullToken, nil
}