github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/communication/nats/signed.go (about)

     1  /*
     2   * Copyright (C) 2021 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program 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   * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package nats
    19  
    20  import (
    21  	"encoding/base64"
    22  	"fmt"
    23  	"time"
    24  
    25  	"github.com/mysteriumnetwork/node/identity"
    26  )
    27  
    28  var (
    29  	// SignatureEncoding represents base64 variant chosen for signature
    30  	// encoding
    31  	SignatureEncoding = base64.RawURLEncoding
    32  )
    33  
    34  // SignedSubject signs topic to pass command through nats-proxy
    35  func SignedSubject(signer identity.Signer, topic string) (string, error) {
    36  	ts := time.Now().Truncate(0).Unix()
    37  
    38  	signature, err := signer.Sign([]byte(fmt.Sprintf("%d.%s", ts, topic)))
    39  	if err != nil {
    40  		return "", err
    41  	}
    42  
    43  	encodedSignature := SignatureEncoding.EncodeToString(signature.Bytes())
    44  
    45  	return fmt.Sprintf("signed.%s.%d.%s", encodedSignature, ts, topic), nil
    46  }