TokenTap Contract

This contract allows users to claim tokens by providing a valid signature from an authorized signer.

Imports

• AccessControl from OpenZeppelin's @openzeppelin/contracts/access/AccessControl.sol
• SafeERC20 from OpenZeppelin's @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol
• IERC20 from OpenZeppelin's @openzeppelin/contracts/token/ERC20/IERC20.sol

Roles

• UNITAP_ROLE: Role assigned to signers who can authorize token claims.

Storage

• usedNonces: A mapping of users' addresses to nonces they've used in order to prevent replay attacks.

Events

• TokensClaimed: Emitted when a user successfully claims tokens.

Errors

• InvalidSignature: Thrown when the provided signature is not valid.
• NonceAlreadyUsed: Thrown when the provided nonce has already been used.

Functions

• constructor: Initializes the contract and grants the deployer the admin and UNITAP_ROLE.
• claimToken: Allows a user to claim tokens by providing a valid signature from an authorized signer.
• recoverSigner: Recovers the address of the signer from the provided message and signature.