ams-backend/js-runtime/src/script/zksync2/mute/swapUsdcForEth.js

import express from "express";
import mathUtil from "../../utils/mathUtil.js";
import {Contract, Provider, Wallet} from "zksync-web3";
import erc20 from "../abi/erc20.js";
import {utils} from "ethers";
import swapAbi from "../abi/swapAbi.js";

const router = express.Router();

async function sendSwapTx(amountNumber, router, signer, provider, wallet, approveGas) {
    const amountIn = amountNumber;
    const path = ["0x3355df6D4c9C3035724Fd0e3914dE96A5a83aaf4", "0x5AEa5775959fBC2557Cc8789bC1bf90A239D9a91"];
    const stable = [false, false]
    let timestamp = new Date().getTime();
    timestamp = (timestamp / 1000 + 20 * 60).toFixed(0);
    const amountsOut = await router.getAmountsOut(amountIn, path, stable);
    const amountOut = (amountsOut[1].mul(995).div(1000));
    const swapTx = await router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountIn, amountOut, path, signer.address, timestamp, stable)
    await swapTx.wait();
    const swapReceipt = await provider.getTransactionReceipt(swapTx.hash);
    const gas = utils.formatEther((swapReceipt.gasUsed * swapTx.gasPrice).toFixed(0));
    const balance = await wallet.getBalance()
    const balanceStr = utils.formatEther(balance);
    const value = utils.formatEther(swapTx.value)
    return {
        code: 0,
        msg: "",
        data: {
            txId: swapTx.hash,
            gas: `${parseFloat(approveGas) + parseFloat(gas)}`,
            currentBalance: balanceStr,
            status: swapReceipt.status,
            value: value
        }
    }
}

router.post("/", async (req, res) => {

    const params = req.body.params;
    const amountMin = params.amountMin;
    const amountMax = params.amountMax;
    const accuracy = params.accuracy;
    const amountNumber = mathUtil.getRandomNumber(amountMin, amountMax, accuracy) * 1000000;
    const signer = req.body.wallet;
    const provider = new Provider('https://mainnet.era.zksync.io');

    const wallet = new Wallet(signer.privateKey, provider);
    const router = "0x8b791913eb07c32779a16750e3868aa8495f5964";
    const usdc = new Contract("0x3355df6d4c9c3035724fd0e3914de96a5a83aaf4", erc20, wallet);
    const routerContract = new Contract(router, swapAbi, wallet);
    // const allowance = await usdc.allowance(signer.address, router);

    let result = {};
    // if (allowance <= 0) {
    const approveTx = await usdc.approve(router, amountNumber);
    await approveTx.wait();
    const txReceipt = await provider.getTransactionReceipt(approveTx.hash);
    const approveGas = utils.formatEther((txReceipt.gasUsed * approveTx.gasPrice).toFixed(0));
    if (txReceipt.status === 1) {
        result = await sendSwapTx(amountNumber, routerContract, signer, provider, wallet, approveGas);
    } else {
        throw new Error("approve error");
    }

    // } else {
    //     result = await sendSwapTx(amountNumber, routerContract, signer, provider, wallet, 0);
    // }
    res.send(result);
})

export default router;