Contract Source Code (Solidity Standard Json-Input format)

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

/**
 * @title ERC20FeeProxy
 * @notice This contract performs an ERC20 token transfer, with a Fee sent to a third address and stores a reference
 */
contract ERC20FeeProxy {
  // Event to declare a transfer with a reference
  event TransferWithReferenceAndFee(
    address tokenAddress,
    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 a ERC20 token transfer with a reference
              and a transfer to a second address for the payment of a fee
    * @param _tokenAddress Address of the ERC20 token smart contract
    * @param _to Transfer recipient
    * @param _amount Amount to transfer
    * @param _paymentReference Reference of the payment related
    * @param _feeAmount The amount of the payment fee
    * @param _feeAddress The fee recipient
    */
  function transferFromWithReferenceAndFee(
    address _tokenAddress,
    address _to,
    uint256 _amount,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address _feeAddress
  ) external {
    require(safeTransferFrom(_tokenAddress, _to, _amount), 'payment transferFrom() failed');
    if (_feeAmount > 0 && _feeAddress != address(0)) {
      require(
        safeTransferFrom(_tokenAddress, _feeAddress, _feeAmount),
        'fee transferFrom() failed'
      );
    }
    emit TransferWithReferenceAndFee(
      _tokenAddress,
      _to,
      _amount,
      _paymentReference,
      _feeAmount,
      _feeAddress
    );
  }

  /**
   * @notice Call transferFrom ERC20 function and validates the return data of a ERC20 contract call.
   * @dev This is necessary because of non-standard ERC20 tokens that don't have a return value.
   * @return result The return value of the ERC20 call, returning true for non-standard tokens
   */
  function safeTransferFrom(
    address _tokenAddress,
    address _to,
    uint256 _amount
  ) internal returns (bool result) {
    /* solium-disable security/no-inline-assembly */
    // check if the address is a contract
    assembly {
      if iszero(extcodesize(_tokenAddress)) {
        revert(0, 0)
      }
    }

    // solium-disable-next-line security/no-low-level-calls
    (bool success, ) = _tokenAddress.call(
      abi.encodeWithSignature('transferFrom(address,address,uint256)', msg.sender, _to, _amount)
    );

    assembly {
      switch returndatasize()
      case 0 {
        // not a standard erc20
        result := 1
      }
      case 32 {
        // standard erc20
        returndatacopy(0, 0, 32)
        result := mload(0)
      }
      default {
        // anything else, should revert for safety
        revert(0, 0)
      }
    }

    require(success, 'transferFrom() has been reverted');

    /* solium-enable security/no-inline-assembly */
    return result;
  }
}

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

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[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"tokenAddress","type":"address"},{"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","name":"_tokenAddress","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes","name":"_paymentReference","type":"bytes"},{"internalType":"uint256","name":"_feeAmount","type":"uint256"},{"internalType":"address","name":"_feeAddress","type":"address"}],"name":"transferFromWithReferenceAndFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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