Check Address

A Solidity library for the Ethereum blockchain to easily distinguish between smart contract and external addresses.

Warning: The checks in this library can be circumvented by calling from within a contract constructor. See the tests for a detailed attack example and check out this discussion exploring the issue.

Consider carefully whether this is acceptable in your use case.

Installation

1. In your project run npm install @1001-digital/check-address
2. Within your contract, import the library import "@1001-digital/check-address/contracts/CheckAddress.sol";
3. In your code, you can check address types like so:

   address account = 0x1234567891011121314151617181920212223242
   if (CheckAddress.isExternal(account)) { 
     // ...
   }

Note: You will have to link the library when creating your contract during development:

const CheckAddress = await ethers.getContractFactory('CheckAddress');
const library = await CheckAddress.deploy()

const MyContract = await ethers.getContractFactory('MyContract', {
  libraries: {
    CheckAddress: library.address,
  },
});

Local Development

To set up your environment run npm install.

Note: You can exchange npm run for hh if you have hh installed globally on your system.

• Run the test suite: npm run test
• Spin up a local development blockchain: npm run node
• Deploy the contract with npm run deploy:localhost

Deployment

Deploy the project via npm run deploy:{NETWORK} with NETWORK being one of localhost|rinkeby|ropsten|mainnet.

Live Deployments

• Mainnet: 0x32336A625aacFA08fe9723d901FFf92A7E3465c1
• Ropsten: 0x87f11cba2Db0cB22b9679c14860bA5Be49Fd0717
• Rinkeby: 0x029374cA831F9F4B04a0D896B8d00CcE05f30D8f

Thank You

If you have any improvement suggestions, feedback or bug reports please feel free add an issue, or reach out via Twitter @jwahdatehagh or Email jalil@1001.digital.