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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '@openzeppelin/contracts/security/ReentrancyGuard.sol';

/**
 * @title EthereumFeeProxy
 * @notice This contract performs an Ethereum transfer with a Fee sent to a third address and stores a reference
 */
contract EthereumFeeProxy is ReentrancyGuard {
  // Event to declare a transfer with a reference
  event TransferWithReferenceAndFee(
    address to,
    uint256 amount,
    bytes indexed paymentReference,
    uint256 feeAmount,
    address feeAddress
  );

  // Fallback function returns funds to the sender
  receive() external payable {
    revert('not payable receive');
  }

  /**
   * @notice Performs an Ethereum transfer with a reference
   * @param _to Transfer recipient
   * @param _paymentReference Reference of the payment related
   * @param _feeAmount The amount of the payment fee (part of the msg.value)
   * @param _feeAddress The fee recipient
   */
  function transferWithReferenceAndFee(
    address payable _to,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address payable _feeAddress
  ) external payable {
    transferExactEthWithReferenceAndFee(
      _to,
      msg.value - _feeAmount,
      _paymentReference,
      _feeAmount,
      _feeAddress
    );
  }

  /**
   * @notice Performs an Ethereum transfer with a reference with an exact amount of eth
   * @param _to Transfer recipient
   * @param _amount Amount to transfer
   * @param _paymentReference Reference of the payment related
   * @param _feeAmount The amount of the payment fee (part of the msg.value)
   * @param _feeAddress The fee recipient
   */
  function transferExactEthWithReferenceAndFee(
    address payable _to,
    uint256 _amount,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address payable _feeAddress
  ) public payable nonReentrant {
    (bool sendSuccess, ) = _to.call{value: _amount}('');
    require(sendSuccess, 'Could not pay the recipient');

    _feeAddress.transfer(_feeAmount);

    // transfer the remaining ethers to the sender
    (bool sendBackSuccess, ) = payable(msg.sender).call{value: msg.value - _amount - _feeAmount}(
      ''
    );
    require(sendBackSuccess, 'Could not send remaining funds to the payer');

    emit TransferWithReferenceAndFee(_to, _amount, _paymentReference, _feeAmount, _feeAddress);
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"bytes","name":"paymentReference","type":"bytes"},{"indexed":false,"internalType":"uint256","name":"feeAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"feeAddress","type":"address"}],"name":"TransferWithReferenceAndFee","type":"event"},{"inputs":[{"internalType":"address payable","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes","name":"_paymentReference","type":"bytes"},{"internalType":"uint256","name":"_feeAmount","type":"uint256"},{"internalType":"address payable","name":"_feeAddress","type":"address"}],"name":"transferExactEthWithReferenceAndFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_to","type":"address"},{"internalType":"bytes","name":"_paymentReference","type":"bytes"},{"internalType":"uint256","name":"_feeAmount","type":"uint256"},{"internalType":"address payable","name":"_feeAddress","type":"address"}],"name":"transferWithReferenceAndFee","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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