Blacklisting users
Prevent certain wallets from paying for gas with ERC-20 tokens.
1
Enabling the blacklist
We can also turn on blacklist mode, where users on the blacklist will be unable to use the paymaster to send gasless transactions.
// Enable the blacklist - note, you can only use either the whitelist or the blacklistconst setBlacklistModeTx = await gasSponsor.setToBlacklistMode()await auth.sendTxs([setBlacklistModeTx])
2
Adding a user to the blacklist
We can add a single user to the blacklist using the code below
const addSpenderToBlacklistTx = await gasSponsor.addSpenderToBlackList(await wallet.getAddress())await auth.sendTxs([addSpenderToBlacklistTx])
3
Removing a user from the blacklist
Or remove a user from the blacklist using the code below
const removeSpenderFromBlacklistTx = await gasSponsor.removeSpenderFromBlackList(await wallet.getAddress())await auth.sendTxs([removeSpenderFromBlacklistTx])
Full code
Here is the full runnable code block for blacklisting users:
sponsorGas.js
const { FunWallet, configureEnvironment } = require("fun-wallet")const { Eoa } = require("fun-wallet/auth")const { fundWallet } = require("fun-wallet/utils")const { TokenSponsor } = require("fun-wallet/sponsors/TokenSponsor")const PRIVATE_KEY = "0x8996148bbbf98e0adf5ce681114fd32288df7dcb97829348cb2a99a600a92c38"const API_KEY = "MYny3w7xJh6PRlRgkJ9604sHouY2MTke6lCPpSHq"const paymasterToken = "usdc"let auth = new Eoa({ privateKey: PRIVATE_KEY })let funder = new Eoa({ privateKey: PRIVATE_KEY })const options = {apiKey: API_KEY,}await configureEnvironment(options)const wallet = new FunWallet({ uniqueId: await auth.getUniqueId(), index: Math.ceil(Math.random() * 100_000_000) })const wallet1 = new FunWallet({ uniqueId: await auth.getUniqueId(), index: Math.ceil(Math.random() * 100_000_000) })const walletAddress = await wallet.getAddress()const walletAddress1 = await wallet1.getAddress()const funderAddress = await funder.getUniqueId()await fundWallet(funder, wallet, 1)await fundWallet(auth, wallet1, 1)await wallet.swap(auth, {in: "eth",amount: 0.01,out: paymasterToken,options: {returnAddress: funderAddress}})await configureEnvironment({gasSponsor: {sponsorAddress: funderAddress,token: paymasterToken,}})const gasSponsor = new TokenSponsor()const addTokens = await gasSponsor.addWhitelistTokens([paymasterToken])const baseStakeAmount = 1const paymasterTokenStakeAmount = 100const approve = await gasSponsor.approve(paymasterToken, paymasterTokenStakeAmount * 2)const deposit = await gasSponsor.stakeToken(paymasterToken, walletAddress, paymasterTokenStakeAmount)const deposit1 = await gasSponsor.stakeToken(paymasterToken, walletAddress1, paymasterTokenStakeAmount)const data = await gasSponsor.stake(funderAddress, baseStakeAmount)await funder.sendTxs([approve, deposit, deposit1, data, addTokens])const setWhitelistModeTx = await gasSponsor.setToWhitelistMode()const addSpenderToWhitelistTx = await gasSponsor.addSpenderToWhiteList(await wallet.getAddress())const removeSpenderFromWhitelistTx = await gasSponsor.removeSpenderFromWhiteList(await wallet.getAddress())const whitelistTx = await auth.sendTxs([setWhitelistModeTx, addSpenderToWhitelistTx, removeSpenderFromWhitelistTx])// Testing Blacklist - note, you can only use either the whitelist or the blacklistconst setBlacklistModeTx = await gasSponsor.setToBlacklistMode()const addSpenderToBlacklistTx = await gasSponsor.addSpenderToBlackList(await wallet.getAddress())const removeSpenderFromBlacklistTx = await gasSponsor.removeSpenderFromBlackList(await wallet.getAddress())const blacklistTx = await auth.sendTxs([setBlacklistModeTx, addSpenderToBlacklistTx, removeSpenderFromBlacklistTx])