YGMIAirdrop

{{
  "language": "Solidity",
  "sources": {
    "YGMI/YGMIAirdrop.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/* -------------------------------------------------------------------------- */
/*                           Minimal OpenZeppelin Refs                         */
/* -------------------------------------------------------------------------- */

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

/* ----------------------------- Ownable (minimal) ---------------------------- */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor(address initialOwner) {
        _transferOwnership(initialOwner);
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not owner");
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is zero");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

/* --------------------------- ReentrancyGuard (min) -------------------------- */
abstract contract ReentrancyGuard {
    uint256 private _status;

    constructor() {
        _status = 1;
    }

    modifier nonReentrant() {
        require(_status == 1, "ReentrancyGuard: reentrant");
        _status = 2;
        _;
        _status = 1;
    }
}

/* ----------------------------- IERC20 interface ---------------------------- */
interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address to, uint256 value) external returns (bool);

    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

/* ------------------------------- SafeERC20 lib ------------------------------ */
library SafeERC20 {
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        require(
            _callOptionalReturn(
                token,
                abi.encodeWithSelector(token.transfer.selector, to, value)
            ),
            "SafeERC20: transfer failed"
        );
    }

    function _callOptionalReturn(
        IERC20 token,
        bytes memory data
    ) private returns (bool) {
        (bool success, bytes memory returndata) = address(token).call(data);
        if (!success) return false;
        if (returndata.length == 0) return true;
        return abi.decode(returndata, (bool));
    }
}

/* ------------------------------- MerkleProof ------------------------------- */
library MerkleProof {
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    function processProof(
        bytes32[] memory proof,
        bytes32 leaf
    ) internal pure returns (bytes32 computedHash) {
        computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                computedHash = keccak256(
                    abi.encodePacked(computedHash, proofElement)
                );
            } else {
                computedHash = keccak256(
                    abi.encodePacked(proofElement, computedHash)
                );
            }
        }
    }
}

/* -------------------------------------------------------------------------- */
/*                                YGMIAirdrop                                 */
/* -------------------------------------------------------------------------- */

contract YGMIAirdrop is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    IERC20 public immutable ygmi;

    struct Round {
        bytes32 merkleRoot;
        uint256 totalClaimed;
    }

    uint256 public currentRound;
    mapping(uint256 => mapping(address => bool)) public hasClaimed;
    mapping(uint256 => Round) public rounds;

    event MerkleRootUpdated(uint256 indexed round, bytes32 indexed newRoot);
    event Claimed(
        uint256 indexed round,
        address indexed account,
        uint256 amount
    );
    event Withdrawn(address indexed to, uint256 amount);

    constructor(IERC20 _ygmi, address _owner) Ownable(_owner) {
        require(address(_ygmi) != address(0), "YGMI address zero");
        ygmi = _ygmi;
    }

    /* ----------------------------- Admin Actions ----------------------------- */

    /// @notice Starts a new round with a new merkle root.
    /// The new root overrides the previous one — only this root is active.
    function setMerkleRoot(bytes32 _root) external onlyOwner {
        require(_root != bytes32(0), "Invalid root");
        currentRound++;
        rounds[currentRound].merkleRoot = _root;
        emit MerkleRootUpdated(currentRound, _root);
    }

    /* ----------------------------- User Functions ---------------------------- */

    function claim(
        uint256 amount,
        bytes32[] calldata proof
    ) external nonReentrant {
        Round storage round = rounds[currentRound];
        require(round.merkleRoot != bytes32(0), "Root not set");
        require(!hasClaimed[currentRound][msg.sender], "Already claimed");
        require(amount > 0, "Zero amount");

        bytes32 leaf = keccak256(abi.encode(msg.sender, amount));
        require(
            MerkleProof.verify(proof, round.merkleRoot, leaf),
            "Invalid proof"
        );

        hasClaimed[currentRound][msg.sender] = true;
        round.totalClaimed += amount;

        ygmi.safeTransfer(msg.sender, amount);
        emit Claimed(currentRound, msg.sender, amount);
    }

    /* ----------------------------- View Helpers ----------------------------- */

    function canClaim(
        address account,
        uint256 amount,
        bytes32[] calldata proof
    ) external view returns (bool) {
        Round storage round = rounds[currentRound];
        if (
            round.merkleRoot == bytes32(0) ||
            hasClaimed[currentRound][account] ||
            amount == 0
        ) return false;
        bytes32 leaf = keccak256(abi.encode(account, amount));
        return MerkleProof.verify(proof, round.merkleRoot, leaf);
    }

    /* ----------------------------- Getters ----------------------------- */

    function getActiveRoot() external view returns (bytes32) {
        return rounds[currentRound].merkleRoot;
    }

    function getTotalClaimed(uint256 roundId) external view returns (uint256) {
        return rounds[roundId].totalClaimed;
    }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "remappings": []
  }
}}