Claim funds from contract verifying user using Zupass

🧪 Based on the Devconnect Zupass: SE2 Starter Kit https://github.com/BuidlGuidl/devconnect-zupass-se2

Smart Contracts

Validate Zupass ticket on a smart contract.

Created a ZupassVerifier contract https://github.com/damianmarti/fruit-market-land/blob/zupass-claim/packages/hardhat/contracts/ZupassVerifier.sol

And then the ZupassDispenser is ZupassVerifier https://github.com/damianmarti/fruit-market-land/blob/zupass-claim/packages/hardhat/contracts/ZupassDispenser.sol

ZupassDispenser getFunds method checks for valid ticket and event, and send funds to user:

  function getFunds(
    ProofArgs calldata proof
  )
    public
    verifiedProof(proof)
    validEventIds(proof._pubSignals)
    validSigner(proof._pubSignals)
    notSent(proof._pubSignals)
  {
    sent[proof._pubSignals[5]] = true;

    (bool daiTransferred, ) = payable(msg.sender).call{value: DAI_FAUCET_AMOUNT}("");
    require(daiTransferred, "Dai transfer failed");

    bool creditTokenTransferred = creditToken.transfer(msg.sender, SALT_FAUCET_AMOUNT);
    require(creditTokenTransferred, "Credit token transfer failed");
  }

sent flag use the attendeeSemaphoreId to avoid sending more than one time to each user.

  modifier notSent(uint256[38] memory _pubSignals) {
    require(!sent[_pubSignals[5]], "Already sent");
    _;
  }

Frontend

Get Zupass proof https://github.com/damianmarti/fruit-market-land/blob/zupass-claim/packages/nextjs/components/screens/Main.tsx#L63

Call ZupassDispenser contract with proof https://github.com/damianmarti/fruit-market-land/blob/zupass-claim/packages/nextjs/components/screens/Main.tsx#L253

More information at Devconnect Zupass: SE2 Starter Kit

🍓 Fruit Market Land

🧪 this is forked from the fruit market repo here

💵 Buy Land and Grow Strawberries!

<img width="719" alt="image" src="https://github.com/austintgriffith/fruit-market-land/assets/2653167/8ec660c1-bd7c-4e10-97b6-3d0fff5a86f5">

📱 very ugly buttons for each land tile:

<img width="592" alt="image" src="https://github.com/austintgriffith/fruit-market-land/assets/2653167/c45dc837-2ecd-452a-b011-e7e584ef73b8">

🗺 check out the land contract in packages/hardhat/contracts/Land.sol

git clone https://github.com/BuidlGuidl/fruit-market-land

cd /fruit-market-land

yarn install

⚙️ bring up the chain and deploy your contracts

yarn chain

yarn deploy

yarn start

🖨 copy packages/nextjs/.env.example to the name .env and edit your frontend env:

💿 you'll need to spin up a KV (key value storage) in vercel and copy/paste in the env.local fields:

NEXT_PUBLIC_DEPLOY_BLOCK=0
NEXT_PUBLIC_LIVE_URL=https://event-wallet.vercel.app
KV_URL=
KV_REST_API_URL=
KV_REST_API_TOKEN=
KV_REST_API_READ_ONLY_TOKEN=

📱 hit the frontend at http://localhost:3000

📝 next, inspect the targetNetwork var in packages/nextjs/scaffold.config.ts

(if you are deploying locally it needs to be chains.hardhat or chains.gnosis out in prod)

💁‍♂️ login as with your nickname:

🏷 now you can use the browser to navigate to the /checkedIn route to drop tokens and gas to players:

⚠️ your frontend address will need to be an admin to drop tokens to players

📝 edit packages/hardhat/deploy/00_deploy_your_contract.ts and add your address to dexPausers

⚙️ redeploy the whole stack with yarn deploy --reset

🤔 try visiting http://localhost:3000 from an incognito window or another browser to have a fresh burner to play with

(check in with a burner and drop some funds to it using your other account and the /checkedIn page)

⚖️ at this point, player should be able to trade credits for resources on the dexes:

---

Charts and Leaderboard

If you want to keep the charts and leaderboard updated you have to run a cron job requesting /api/admin/track-prices:

* * * * * /usr/bin/curl https://domain/api/admin/track-prices >> prices.log

Or you can set the cron job at Vercel using the /packages/nextjs/vercel.json config file.

(On localhost you can just use the browser to hit http://localhost:3000/api/admin/track-prices manually)

---

Trading Bots

If you want prices to randomly fluctuate you need to run bots that have a bunch of liquidity and trade randomly:

git clone https://github.com/BuidlGuidl/fruit-market-trader

cd fruit-market-trader

yarn install

💾 you will need to copy your fruit-market packages/nextjs/generated/deployedContracts.ts into this fruit-market-trader/deployedContracts.js

⚠️ notice it changes from .ts to .js - you will also have to remove the as const from the end

(this tells your bots about the new contracts you've deployed)

☢️ Notice: any time you need to redeploy, do yarn deploy --reset and recopy over your deployedContracts.js

✏️ copy the .env.example to .env file in the fruit-market-trader dir with the following info filled in:

DEPLOYER_PRIVATE_KEY=0xYOUR_PRIVATE_KEY_FROM_YOUR_LOCAL_STORAGE
GNOSIS_RPC=http://127.0.0.1:8545
GNOSIS_NETWORK_ID=31337

(you can get this private key from the local storage. it's called scaffoldEth2.burnerWallet.sk)

⛽️ if your this address is loaded up with local funds, you should be good to run:

node batchPrep.js

⚙️ this is going to generate a bunch of trader accounts, send them tokens, and save the private keys up in your .env file:

(if anything fails here it probably means your burner is not correctly funded with credits and assets and you can debug balances using http://localhost:3000/debug)

🍎 now you can start a trading bot for each resource like:

node tradeDex.js Apple