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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package v1
import (
"crypto/subtle"
"net/http"
"github.com/algorand/go-algorand/logging"
"github.com/algorand/go-algorand/util/tokens"
)
const (
// KMDTokenHeader is the HTTP header used for the pre-shared auth token
KMDTokenHeader = "X-KMD-API-Token"
)
func authMiddleware(log logging.Logger, apiToken string) func(http.Handler) http.Handler {
// Make sure no one is trying to call us with an invalid token
err := tokens.ValidateAPIToken(apiToken)
if err != nil {
log.Fatalf("cannot start server with invalid API token: %v", err)
}
apiTokenBytes := []byte(apiToken)
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Grab the apiToken from the HTTP header
providedToken := []byte(r.Header.Get(KMDTokenHeader))
// Check the token in constant time
if subtle.ConstantTimeCompare(providedToken, apiTokenBytes) == 1 {
// Token was correct, keep serving request
next.ServeHTTP(w, r)
return
}
// Token was incorrect, return an error
errorResponse(w, http.StatusUnauthorized, errInvalidAPIToken)
})
}
}
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