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// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// ============ Imports ============

//import { MerkleProof } from "@openzeppelin/utils/cryptography/MerkleProof.sol"; // OZ: MerkleProof
import { Owned } from "./Owned.sol";
import { TransferHelper } from "./TransferHelper.sol";
import { MerkleProof } from "./MerkleProof.sol"; // OZ: MerkleProof

interface IERC20 {
  function approve(address spender, uint256 amount) external returns (bool);
  function allowance(address owner, address spender) external view returns (uint256);
  function balanceOf(address account) external view returns (uint256);
  function transfer(address to, uint256 amount) external returns (bool);
  function transferFrom(address from, address to, uint256 amount ) external returns (bool);
}

/// @title MerkleClaim
/// @notice Allows a held ERC20 to be claimable by members of a merkle tree
/// @author Anish Agnihotri <[email protected]>
/// @author Jack Corddry https://github.com/corddry
contract MerkleClaim is Owned{

  /// ============ Immutable storage ============

  /// @notice ERC20-claimee inclusion root
  bytes32 public immutable merkleRoot;

  /// @notice Contract address of airdropped token
  IERC20 public immutable token;

  address public timelock_address;

  /// ============ Mutable storage ============

  /// @notice Mapping of addresses who have claimed tokens
  mapping(address => bool) public hasClaimed;

  /// ============ Errors ============

  /// @notice Thrown if address has already claimed
  error AlreadyClaimed();
  /// @notice Thrown if address/amount are not part of Merkle tree
  error NotInMerkle();
  /// @notice Thrown if claim contract doesn't have enough tokens to payout
  error notEnoughRewards();

  /// ============ Modifiers ============

  modifier onlyByOwnGov() {
    require(msg.sender == owner || msg.sender == timelock_address, "Not owner or timelock");
    _;
  }

  /// ============ Constructor ============

  /// @notice Creates a new MerkleClaimERC20 contract
  /// @param _erc20Address of token to be airdropped
  /// @param _merkleRoot of claimees
  constructor(
    address _erc20Address,
    bytes32 _merkleRoot,
    address _owner_address,
    address _timelock_address
  ) Owned(_owner_address)
  {
    merkleRoot = _merkleRoot;
    token = IERC20(_erc20Address);
    timelock_address = _timelock_address;
  }

  /// ============ Events ============

  /// @notice Emitted after a successful token claim
  /// @param to recipient of claim
  /// @param amount of tokens claimed
  event Claim(address indexed to, uint256 amount);

  /// @notice Emitted after a successful token recovery
  /// @param token address being recovered
  /// @param amount of tokens recoverd
  event Recovered(address token, uint256 amount);

  /// ============ Functions ============

  /// @notice Allows claiming tokens if address is part of merkle tree
  /// @param to address of claimee
  /// @param amount of tokens owed to claimee
  /// @param proof merkle proof to prove address and amount are in tree
  function claim(address to, uint256 amount, bytes32[] calldata proof) external {
    // Throw if address has already claimed tokens
    if (hasClaimed[to]) revert AlreadyClaimed();

    // Verify merkle proof, or revert if not in tree
    bytes32 leaf = keccak256(abi.encodePacked(to, amount));
    bool isValidLeaf = MerkleProof.verify(proof, merkleRoot, leaf);
    if (!isValidLeaf) revert NotInMerkle();

    // Throw if the contract doesn't hold enough tokens for claimee
    if (amount > token.balanceOf(address(this))) revert notEnoughRewards();

    // Set address to claimed
    hasClaimed[to] = true;

    // Award tokens to address
    token.transfer(to, amount);

    // Emit claim event
    emit Claim(to, amount);
  }

    /// ============ Permissioned Functions ============
  
    function setTimelock(address _new_timelock_address) external onlyByOwnGov {
      timelock_address = _new_timelock_address;
    }
    
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyByOwnGov {
        // Can only be triggered by owner or governance
        TransferHelper.safeTransfer(tokenAddress, owner, tokenAmount);
        
        emit Recovered(tokenAddress, tokenAmount);
    }

    // Generic proxy
    function execute(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external onlyByOwnGov returns (bool, bytes memory) {
        (bool success, bytes memory result) = _to.call{value:_value}(_data);
        return (success, result);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = _efficientHash(computedHash, proofElement);
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = _efficientHash(proofElement, computedHash);
            }
        }
        return computedHash;
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.11;

// https://docs.synthetix.io/contracts/Owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor (address _owner) {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        require(msg.sender == owner, "Only the contract owner may perform this action");
        _;
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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000000000000000000000000c2544a32872a91f4a553b404c6950e89de901fdb1cc89145d7ddfb4a255e327ab01d1f98259db2b14430efdc24124d5cdb169ba10000000000000000000000003ce4d19c155d977b04c8560ed1cc9c6f38ee3d320000000000000000000000008412ebf45bac1b340bbe8f318b928c466c4e39ca

-----Decoded View---------------
Arg [0] : _erc20Address (address): 0xc2544A32872A91F4A553b404C6950e89De901fdb
Arg [1] : _merkleRoot (bytes32): 0x1cc89145d7ddfb4a255e327ab01d1f98259db2b14430efdc24124d5cdb169ba1
Arg [2] : _owner_address (address): 0x3CE4d19C155D977B04C8560Ed1Cc9C6F38Ee3d32
Arg [3] : _timelock_address (address): 0x8412ebf45bAC1B340BbE8F318b928C466c4E39CA

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000c2544a32872a91f4a553b404c6950e89de901fdb
Arg [1] : 1cc89145d7ddfb4a255e327ab01d1f98259db2b14430efdc24124d5cdb169ba1
Arg [2] : 0000000000000000000000003ce4d19c155d977b04c8560ed1cc9c6f38ee3d32
Arg [3] : 0000000000000000000000008412ebf45bac1b340bbe8f318b928c466c4e39ca