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// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.0;

import "../vendor/MerkleProof.sol";
import "../Utils.sol";

interface IEulStakes {
    function stakeGift(address beneficiary, address underlying, uint amount) external;
}

contract EulDistributor {
    address public immutable eul;
    address public immutable eulStakes;
    string public constant name = "EUL Distributor";

    address public owner;
    bytes32 public currRoot;
    bytes32 public prevRoot;
    mapping(address => mapping(address => uint)) public claimed; // account -> token -> amount

    event OwnerChanged(address indexed newOwner);

    constructor(address eul_, address eulStakes_) {
        eul = eul_;
        eulStakes = eulStakes_;
        owner = msg.sender;
        Utils.safeApprove(eul_, eulStakes_, type(uint).max);
    }

    // Owner functions

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

    function transferOwnership(address newOwner) external onlyOwner {
        owner = newOwner;
        emit OwnerChanged(newOwner);
    }

    function updateRoot(bytes32 newRoot) external onlyOwner {
        prevRoot = currRoot;
        currRoot = newRoot;
    }

    // Claiming

    /// @notice Claim distributed tokens
    /// @param account Address that should receive tokens
    /// @param token Address of token being claimed (ie EUL)
    /// @param proof Merkle proof that validates this claim
    /// @param stake If non-zero, then the address of a token to auto-stake to, instead of claiming
    function claim(address account, address token, uint claimable, bytes32[] calldata proof, address stake) external {
        bytes32 candidateRoot = MerkleProof.processProof(proof, keccak256(abi.encodePacked(account, token, claimable))); // 72 byte leaf
        require(candidateRoot == currRoot || candidateRoot == prevRoot, "proof invalid/expired");

        uint alreadyClaimed = claimed[account][token];
        require(claimable > alreadyClaimed, "already claimed");

        uint amount;
        unchecked {
            amount = claimable - alreadyClaimed;
        }

        claimed[account][token] = claimable;

        if (stake == address(0)) {
            Utils.safeTransfer(token, account, amount);
        } else {
            require(msg.sender == account, "can only auto-stake for yourself");
            require(token == eul, "can only auto-stake EUL");
            IEulStakes(eulStakes).stakeGift(account, stake, amount);
        }
    }
}

// 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.
 */
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 Merklee 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: GPL-2.0-or-later

pragma solidity ^0.8.0;

import "./Interfaces.sol";

library Utils {
    function safeTransferFrom(address token, address from, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transferFrom.selector, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), string(data));
    }

    function safeTransfer(address token, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), string(data));
    }

    function safeApprove(address token, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.approve.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), string(data));
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.0;


interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

interface IERC20Permit {
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    function permit(address holder, address spender, uint256 nonce, uint256 expiry, bool allowed, uint8 v, bytes32 r, bytes32 s) external;
    function permit(address owner, address spender, uint value, uint deadline, bytes calldata signature) external;
}

interface IERC3156FlashBorrower {
    function onFlashLoan(address initiator, address token, uint256 amount, uint256 fee, bytes calldata data) external returns (bytes32);
}

interface IERC3156FlashLender {
    function maxFlashLoan(address token) external view returns (uint256);
    function flashFee(address token, uint256 amount) external view returns (uint256);
    function flashLoan(IERC3156FlashBorrower receiver, address token, uint256 amount, bytes calldata data) external returns (bool);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"eul_","type":"address"},{"internalType":"address","name":"eulStakes_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"claimable","type":"uint256"},{"internalType":"bytes32[]","name":"proof","type":"bytes32[]"},{"internalType":"address","name":"stake","type":"address"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"claimed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"eul","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"eulStakes","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prevRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"newRoot","type":"bytes32"}],"name":"updateRoot","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000d9fcd98c322942075a5c3860693e9f4f03aae07b000000000000000000000000c697bb6625d9f7adcf0fbf0cbd4dcf50d8716cd3

-----Decoded View---------------
Arg [0] : eul_ (address): 0xd9Fcd98c322942075A5C3860693e9f4f03AAE07b
Arg [1] : eulStakes_ (address): 0xc697BB6625D9f7AdcF0fbf0cbd4DcF50D8716cd3

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000d9fcd98c322942075a5c3860693e9f4f03aae07b
Arg [1] : 000000000000000000000000c697bb6625d9f7adcf0fbf0cbd4dcf50d8716cd3

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