FeeDelegateDecode.js

module.exports = { UnsignedTxDecode,SignedTxDecode }

const Utils = require('ethereumjs-util')
const RLP = Utils.rlp
const D_TxType = "0x02"
const FD_TxType = "0x16"

// DynamicFeeTx & Fee Delegate(FD) DynamicFeeTx Unsigned RLP decode
function UnsignedTxDecode(rawTransaction) {
    let decodeTx = {}
    let txType = rawTransaction.slice(0, 4)
    console.log("decodeRLP=", txType)
    if (txType == D_TxType) {
        let [chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gas, to, value, data, [accessList]] = RLP.decode(Utils.toBuffer('0x' + rawTransaction.slice(4)))
        decodeTx.chainId = Utils.bufferToInt(chainId);
        decodeTx.nonce = Utils.bufferToInt(nonce);
        decodeTx.maxPriorityFeePerGas = Utils.bufferToHex(maxPriorityFeePerGas);
        decodeTx.maxFeePerGas = Utils.bufferToHex(maxFeePerGas);
        decodeTx.gas = Utils.bufferToHex(gas);
        decodeTx.to = Utils.bufferToHex(to);
        decodeTx.value = Utils.bufferToHex(value);
        decodeTx.input = Utils.bufferToHex(data);
        decodeTx.accessList = Utils.bufferToHex(accessList);
        if (decodeTx.accessList == '0x') decodeTx.accessList = []
    } else if (txType == FD_TxType) {
        let [[chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gas, to, value, data, [accessList], v, r, s], feePayer] = RLP.decode(Utils.toBuffer('0x' + rawTransaction.slice(4)))
        decodeTx.chainId = Utils.bufferToInt(chainId);
        decodeTx.nonce = Utils.bufferToInt(nonce);
        decodeTx.maxPriorityFeePerGas = Utils.bufferToHex(maxPriorityFeePerGas);
        decodeTx.maxFeePerGas = Utils.bufferToHex(maxFeePerGas);
        decodeTx.gas = Utils.bufferToHex(gas);
        decodeTx.to = Utils.bufferToHex(to);
        decodeTx.value = Utils.bufferToHex(value);
        decodeTx.input = Utils.bufferToHex(data);
        decodeTx.accessList = Utils.bufferToHex(accessList);
        if (decodeTx.accessList == '0x') decodeTx.accessList = []
        decodeTx.v = v;
        decodeTx.r = r;
        decodeTx.s = s;
        decodeTx.feePayer = Utils.bufferToHex(feePayer);
    }
    return decodeTx
}

// DynamicFeeTx & Fee Delegate(FD) DynamicFeeTx Signed RLP decode
function SignedTxDecode(rawTransaction){
    let decodeTx={}
    let txType = rawTransaction.slice(0,4)
    console.log("decodeRLP=",txType)
    if(txType == D_TxType) {
        let [chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gas, to, value, data, [accessList], v, r, s] = RLP.decode(Utils.toBuffer('0x' + rawTransaction.slice(4)))
        decodeTx.chainId = Utils.bufferToInt(chainId);
        decodeTx.nonce = Utils.bufferToInt(nonce);
        decodeTx.maxPriorityFeePerGas = Utils.bufferToHex(maxPriorityFeePerGas);
        decodeTx.maxFeePerGas = Utils.bufferToHex(maxFeePerGas);
        decodeTx.gas = Utils.bufferToHex(gas);
        decodeTx.to = Utils.bufferToHex(to);
        decodeTx.value = Utils.bufferToHex(value);
        decodeTx.input = Utils.bufferToHex(data);
        decodeTx.accessList = Utils.bufferToHex(accessList);
        if(decodeTx.accessList=='0x') decodeTx.accessList=[]
        decodeTx.v = v;
        decodeTx.r = r;
        decodeTx.s = s;
    }else if(txType == FD_TxType) {
        let [[chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gas, to, value, data, [accessList], v, r, s], feePayer, fv, fr, fs] = RLP.decode(Utils.toBuffer('0x' + rawTransaction.slice(4)))
        decodeTx.chainId = Utils.bufferToInt(chainId);
        decodeTx.nonce = Utils.bufferToInt(nonce);
        decodeTx.maxPriorityFeePerGas = Utils.bufferToHex(maxPriorityFeePerGas);
        decodeTx.maxFeePerGas = Utils.bufferToHex(maxFeePerGas);
        decodeTx.gas = Utils.bufferToHex(gas);
        decodeTx.to = Utils.bufferToHex(to);
        decodeTx.value = Utils.bufferToHex(value);
        decodeTx.input = Utils.bufferToHex(data);
        decodeTx.accessList = Utils.bufferToHex(accessList);
        if(decodeTx.accessList=='0x') decodeTx.accessList=[]
        decodeTx.v = v;
        decodeTx.r = r;
        decodeTx.s = s;
        decodeTx.feePayer = Utils.bufferToHex(feePayer);
        decodeTx.fv = fv;
        decodeTx.fr = fr;
        decodeTx.fs = fs;
    }
    return decodeTx
}