github.com/klaytn/klaytn@v1.12.1/cmd/homi/extra/encoder.go (about)

     1  // Copyright 2018 The klaytn Authors
     2  // Copyright 2017 AMIS Technologies
     3  // This file is part of the go-ethereum library.
     4  //
     5  // The go-ethereum library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // The go-ethereum library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  // GNU Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package extra
    19  
    20  import (
    21  	"bytes"
    22  
    23  	atypes "github.com/klaytn/klaytn/blockchain/types"
    24  	"github.com/klaytn/klaytn/common"
    25  	"github.com/klaytn/klaytn/common/hexutil"
    26  	"github.com/klaytn/klaytn/rlp"
    27  )
    28  
    29  func Encode(vanity string, validators []common.Address) (string, error) {
    30  	newVanity, err := hexutil.Decode(vanity)
    31  	if err != nil {
    32  		return "", err
    33  	}
    34  
    35  	if len(newVanity) < atypes.IstanbulExtraVanity {
    36  		newVanity = append(newVanity, bytes.Repeat([]byte{0x00}, atypes.IstanbulExtraVanity-len(newVanity))...)
    37  	}
    38  	newVanity = newVanity[:atypes.IstanbulExtraVanity]
    39  
    40  	ist := &atypes.IstanbulExtra{
    41  		Validators:    validators,
    42  		Seal:          make([]byte, atypes.IstanbulExtraSeal),
    43  		CommittedSeal: [][]byte{},
    44  	}
    45  
    46  	payload, err := rlp.EncodeToBytes(&ist)
    47  	if err != nil {
    48  		return "", err
    49  	}
    50  
    51  	return "0x" + common.Bytes2Hex(append(newVanity, payload...)), nil
    52  }