helper-hardhat-config.js

const networkConfig = {
    default: {
        name: 'hardhat',
        fee: '100000000000000000',
        keyHash: '0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4',
        jobId: '29fa9aa13bf1468788b7cc4a500a45b8',
        fundAmount: "1000000000000000000"
    },
    31337: {
        name: 'localhost',
        fee: '100000000000000000',
        keyHash: '0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4',
        jobId: '29fa9aa13bf1468788b7cc4a500a45b8',
        fundAmount: "1000000000000000000"
    },
    42: {
        name: 'kovan',
        linkToken: '0xa36085F69e2889c224210F603D836748e7dC0088',
        ethUsdPriceFeed: '0x9326BFA02ADD2366b30bacB125260Af641031331',
        keyHash: '0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4',
        vrfCoordinator: '0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9',
        oracle: '0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e',
        jobId: '29fa9aa13bf1468788b7cc4a500a45b8',
        fee: '100000000000000000',
        fundAmount: "1000000000000000000"
    },
    137: {
        name: 'polygon',
        linkToken: '0xb0897686c545045aFc77CF20eC7A532E3120E0F1',
        keyHash: '0xf86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da',
        vrfCoordinator: '0x3d2341ADb2D31f1c5530cDC622016af293177AE0',
        fee: '100000000000000',
        fundAmount: '200000000000000'
    },
    4: {
        name: 'rinkeby',
        linkToken: '0x01be23585060835e02b77ef475b0cc51aa1e0709',
        ethUsdPriceFeed: '0x8A753747A1Fa494EC906cE90E9f37563A8AF630e',
        keyHash: '0x2ed0feb3e7fd2022120aa84fab1945545a9f2ffc9076fd6156fa96eaff4c1311',
        vrfCoordinator: '0xb3dCcb4Cf7a26f6cf6B120Cf5A73875B7BBc655B',
        oracle: '0x7AFe1118Ea78C1eae84ca8feE5C65Bc76CcF879e',
        jobId: '6d1bfe27e7034b1d87b5270556b17277',
        fee: '100000000000000000',
        fundAmount: "1000000000000000000"
    },
    1: {
        name: 'mainnet',
        linkToken: '0x514910771af9ca656af840dff83e8264ecf986ca',
        fundAmount: "0"
    },
    5: {
        name: 'goerli',
        linkToken: '0x326c977e6efc84e512bb9c30f76e30c160ed06fb',
        fundAmount: "0"
    }
}

const developmentChains = ["hardhat", "localhost"]

const getNetworkIdFromName = async (networkIdName) => {
    for (const id in networkConfig) {
        if (networkConfig[id]['name'] == networkIdName) {
            return id
        }
    }
    return null
}

const autoFundCheck = async (contractAddr, networkName, linkTokenAddress, additionalMessage) => {
    const chainId = await getChainId()
    console.log("Checking to see if contract can be auto-funded with LINK:")
    const amount = networkConfig[chainId]['fundAmount']
    //check to see if user has enough LINK
    const accounts = await ethers.getSigners()
    const signer = accounts[0]
    const LinkToken = await ethers.getContractFactory("LinkToken")
    const linkTokenContract = new ethers.Contract(linkTokenAddress, LinkToken.interface, signer)
    const balanceHex = await linkTokenContract.balanceOf(signer.address)
    const balance = await web3.utils.toBN(balanceHex._hex).toString()
    const contractBalanceHex = await linkTokenContract.balanceOf(contractAddr)
    const contractBalance = await web3.utils.toBN(contractBalanceHex._hex).toString()
    if (balance > amount && amount > 0 && contractBalance < amount) {
        //user has enough LINK to auto-fund
        //and the contract isn't already funded
        return true
    } else { //user doesn't have enough LINK, print a warning
        console.log("Account doesn't have enough LINK to fund contracts, or you're deploying to a network where auto funding isnt' done by default")
        console.log("Please obtain LINK via the faucet at https://" + networkName + ".chain.link/, then run the following command to fund contract with LINK:")
        console.log("npx hardhat fund-link --contract " + contractAddr + " --network " + networkName + additionalMessage)
        return false
    }
}

module.exports = {
    networkConfig,
    getNetworkIdFromName,
    autoFundCheck,
    developmentChains
}