Gatekeeper

Access control for DApps.

Gatekeeper provides token-based access control for web3 applications. This is enabled by rules defined in a smart-contract. This example uses an ERC721 token with a single boolean state property providing proof of access rights.

Gatekeeper was developed during BlockathonDAO March 2022.

Stack

• Ethereum blockchain
• Node (v16 recommended)
• Typescript
• Ethers.js
• Hardhat
• OpenZeppelin
• React
• TailwindCSS

Build and Run

Install node packages:

yarn install

Create a .env file in root of the repo with the following entries:

ALCHEMY_RINKEBY_URL=https://eth-rinkeby.alchemyapi.io/v2/<YOUR_API_KEY>
PRIVATE_KEY=...
COINMARKETCAP_API_KEY=...

Compile the contract:

yarn sol:compile

Start the application:

yarn run dev

Open http://localhost:3000

Contract Tests

To run the tests for the contract functions:

yarn run sol:test

Deploying Your Own Contract

If you prefer to use your own instance of the SleepyKoala contract:

1. yarn sol:compile
2. yarn sol:deploy:rinkeby
3. Update contractAddress in Minter.tsx with the contract address returned in step 2.
4. Restart the application.

Usage

The sample contract is deployed on the Rinkeby testnet. You will require a small amount of test ETH.

1. On the home page connect to your MetaMask wallet.
2. Click the Mint KOL button.
3. Confirm the transaction in the MetaMask wallet and wait for the minted NFT.
4. The new NFT does not have sufficient access privileges so click the Invert NFT button.
5. Confirm the transaction and wait for access to be granted.

Note: For ease of demonstration and testing the app requires a new token to be minted every time. In a real-world scenario the newly minted KOL token will be automatically detected in the users wallet.

Contract

SleepyKoala

mint()

getTokenData()

invertTokenData()

setTokenData()