Official Go implementation of the Ethereum protocol
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go-ethereum/node/jwt_auth.go

46 lines
1.6 KiB

// Copyright 2022 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 node
import (
"fmt"
"net/http"
"time"
"github.com/ethereum/go-ethereum/rpc"
"github.com/golang-jwt/jwt/v4"
)
// NewJWTAuth creates an rpc client authentication provider that uses JWT. The
// secret MUST be 32 bytes (256 bits) as defined by the Engine-API authentication spec.
//
// See https://github.com/ethereum/execution-apis/blob/main/src/engine/authentication.md
// for more details about this authentication scheme.
func NewJWTAuth(jwtsecret [32]byte) rpc.HTTPAuth {
return func(h http.Header) error {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
"iat": &jwt.NumericDate{Time: time.Now()},
})
s, err := token.SignedString(jwtsecret[:])
if err != nil {
return fmt.Errorf("failed to create JWT token: %w", err)
}
h.Set("Authorization", "Bearer "+s)
return nil
}
}