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Outline

• interface IERC1155
•    - function safeTransferFrom(
•  contract NftDrop *
•    - function redeemNft(
•    - function getSigner(
•    - function hasReedeemed(address address ...
•    - function emergencyExecute(
•    - function supportsInterface(bytes4 int ...
•    - function onERC1155Received(

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/**
 *Submitted for verification at Etherscan.io on 2021-05-05
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

interface IERC1155 {
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;
}

contract NftDrop {
    address public owner;
    address public nftAddress;
    uint256 public nftTokenId;
    mapping(address => bool) redemptions;
    bytes4 immutable onErc1155SuccessfulResult =
        bytes4(
            keccak256(
                "onERC1155Received(address,address,uint256,uint256,bytes)"
            )
        );
    event WithdrawArt(address withdrawnTo);

    modifier onlyOwner() {
        require(msg.sender == owner, "must be owner");
        _;
    }

    constructor(address _nftAddress, uint256 _nftTokenId) public {
        owner = msg.sender;
        nftAddress = _nftAddress;
        nftTokenId = _nftTokenId;
    }

    function redeemNft(
        address address1,
        bytes32 r,
        bytes32 s,
        uint8 v
    ) public {
        require(
            (getSigner(address1, r, s, v) == owner),
            "must be signed by owner"
        );
        require(!hasReedeemed(address1), "already redeemed");

        redemptions[address1] = true;
        IERC1155(nftAddress).safeTransferFrom(
            address(this),
            address1,
            nftTokenId,
            1,
            ""
        );
        emit WithdrawArt(address1);
    }

    function getSigner(
        address aCustomAddress,
        bytes32 r,
        bytes32 s,
        uint8 v
    ) public pure returns (address) {
        bytes memory prefix = "\x19Ethereum Signed Message:\n32";
        bytes32 hash = keccak256(abi.encodePacked(aCustomAddress));
        bytes32 prefixedHash = keccak256(abi.encodePacked(prefix, hash));
        return ecrecover(prefixedHash, v, r, s);
    }

    function hasReedeemed(address address1) public view returns (bool) {
        return redemptions[address1];
    }

    function emergencyExecute(
        address targetAddress,
        bytes memory targetCallData
    ) public onlyOwner returns (bool) {
        (bool success, ) = targetAddress.call(targetCallData);
        return success;
    }

    function supportsInterface(bytes4 interfaceID)
        external
        pure
        returns (bool)
    {
        return interfaceID == 0x01ffc9a7 || interfaceID == 0x4e2312e0;
    }

    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4) {
        return onErc1155SuccessfulResult;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_nftAddress","type":"address"},{"internalType":"uint256","name":"_nftTokenId","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"withdrawnTo","type":"address"}],"name":"WithdrawArt","type":"event"},{"inputs":[{"internalType":"address","name":"targetAddress","type":"address"},{"internalType":"bytes","name":"targetCallData","type":"bytes"}],"name":"emergencyExecute","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"aCustomAddress","type":"address"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"},{"internalType":"uint8","name":"v","type":"uint8"}],"name":"getSigner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"address1","type":"address"}],"name":"hasReedeemed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nftAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nftTokenId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"address","name":"from","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"address1","type":"address"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"},{"internalType":"uint8","name":"v","type":"uint8"}],"name":"redeemNft","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceID","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"}]

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ipfs://d88ddc04d98a5ad5af41c53ac51c302f1963c43922b826046b4b970edb3b9c6d