RewardToken.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import '@openzeppelin/contracts/access/AccessControl.sol';

/**
 * @title RewardToken
 * @author Damn Vulnerable DeFi (https://damnvulnerabledefi.xyz)
 * @dev A mintable ERC20 with 2 decimals to issue rewards
 */

contract RewardToken is ERC20, AccessControl {
	bytes32 public constant MINTER_ROLE = keccak256('MINTER_ROLE');

	constructor() ERC20('Reward Token', 'RWT') {
		_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
		_setupRole(MINTER_ROLE, msg.sender);
	}

	function mint(address to, uint256 amount) external {
		require(hasRole(MINTER_ROLE, msg.sender));
		_mint(to, amount);
	}
}