Robbit.txt

Raw Signed Transaction: 
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TX Hash: 0x51e7517951f927efdd5547ab1069e7c23c1e610f1de4642f0be049c9dc2a9868

Gas Price: 40 gwei

Code: 

contract Robbit is PermissionedBaseChallenge {
    using ECDSA for bytes32;

    constructor(address[] memory _allowed) payable PermissionedBaseChallenge(_allowed) {}

    function claim(bytes memory _signature) public {
        address a = getSigner(msg.sender, _signature);
        require (bytes3(bytes20(a)) == 0x000000, "Nah dawg");

        _mint(msg.sender);
    }

    function getSigner(address _a, bytes memory _sig) public pure returns (address) {
        return (keccak256(abi.encodePacked(_a)).toEthSignedMessageHash()).recover(_sig);
    }
}

contract PermissionedBaseChallenge {
    mapping(address => bool) public allowed;

    constructor(address[] memory _a) payable {
        allowed[msg.sender] = true;
        for (uint8 i = 0; i < _a.length; i++) {
            allowed[_a[i]] = true;
        }
    }

    function _mint(address _a) internal {
        require(allowed[_a], "No");
        if (address(this).balance > 0) {
            require(
                payable(_a).send(address(this).balance),
                "Could not send funds"
            );
        }
    }
}

library ECDSA {
    function recover(bytes32 hash, bytes memory signature)
        internal
        pure
        returns (address)
    {
        bytes32 r;
        bytes32 s;
        uint8 v;

        if (signature.length != 65) {
            return (address(0));
        }

        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        if (v < 27) {
            v += 27;
        }

        if (v != 27 && v != 28) {
            return (address(0));
        } else {
            return ecrecover(hash, v, r, s);
        }
    }

    function toEthSignedMessageHash(bytes32 hash)
        internal
        pure
        returns (bytes32)
    {
        return keccak256(
            abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)
        );
    }
}