PoWFaucetVault.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

// Contract Factory: 0xd58660caD6E1eeeaFf48647c10Fd49428E6277D9 / Salt: 1
// Source Code:  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// Constructor:  000000000000000000000000332e43696a505ef45b9319973785f837ce5267b9
// Contract Address:  0xA5058fbcD09425e922E3E9e78D569aB84EdB88Eb

import "@openzeppelin/contracts/access/AccessControl.sol";

interface IERC20Interface {
  function transfer(address _to, uint256 _value) external returns (bool success);
  function balanceOf(address account) external view returns (uint256);
}

struct FaucetAllowance {
  uint256 amount;
  uint256 interval;
}

struct FaucetWithdrawal {
  uint256 time;
  uint256 amount;
}

contract PoWFaucetVault is AccessControl {

  mapping(address => FaucetAllowance) private _faucetAllowances;
  mapping(address => mapping(uint256 => FaucetWithdrawal)) private _faucetWithdrawals;
  mapping(address => uint256) private _faucetWithdrawalCount;

  event FaucetWithdraw(address indexed faucet, uint time, uint amount);

  constructor(address owner) {
    _grantRole(DEFAULT_ADMIN_ROLE, owner);
  }

  function sendToken(address tokenAddr, address addr, uint256 amount) public onlyRole(DEFAULT_ADMIN_ROLE) {
    IERC20Interface token = IERC20Interface(tokenAddr);
    uint256 balance = token.balanceOf(address(this));
    require(balance > 0, "token balance is 0");
    require(balance >= amount, "amount is bigger than token balance");
    token.transfer(addr, amount);
  }

  function sendEther(address addr, uint256 amount) public onlyRole(DEFAULT_ADMIN_ROLE) {
    uint balance = address(this).balance;
    require(balance > 0, "wallet is empty");
    require(balance >= amount, "not enough funds in wallet");

    (bool sent, ) = payable(addr).call{value: amount}("");
    require(sent, "failed to send ether");
  }

  function _selfdestruct(address addr) public onlyRole(DEFAULT_ADMIN_ROLE) {
    selfdestruct(payable(addr));
  }


  receive() external payable {
  }

  function setAllowance(address addr, uint256 amount, uint256 interval) public onlyRole(DEFAULT_ADMIN_ROLE) {
    _faucetAllowances[addr] = FaucetAllowance({
      amount: amount,
      interval: interval
    });
  }

  function getWithdrawnAmount(address addr, uint256 time) public view returns (uint256) {
    uint256 withdrawalIndex = _faucetWithdrawalCount[addr];
    uint256 amount = 0;
    while(withdrawalIndex > 0) {
      withdrawalIndex--;
      FaucetWithdrawal memory withdrawal = _faucetWithdrawals[addr][withdrawalIndex];
      if(withdrawal.time < time)
        break;
      amount += withdrawal.amount;
    }
    return amount;
  }

  function getAllowance(address addr) public view returns (uint256) {
    FaucetAllowance memory allowance = _faucetAllowances[addr];
    uint256 amount = allowance.amount;
    if(amount > 0) {
      uint256 withdrawn = getWithdrawnAmount(addr, block.timestamp - allowance.interval);
      if(withdrawn >= amount)
        amount = 0;
      else
        amount -= withdrawn;
    }
    return amount;
  }

  function withdraw(uint256 amount) public {
    uint256 allowance = getAllowance(msg.sender);
    require(allowance > 0, "withdrawal denied");
    require(amount <= allowance, "amount exceeds allowance");
    require(amount <= address(this).balance, "amount exceeds vault balance");

    uint256 withdrawalIndex = _faucetWithdrawalCount[msg.sender];
    _faucetWithdrawals[msg.sender][withdrawalIndex] = FaucetWithdrawal({
      time: block.timestamp,
      amount: amount
    });
    _faucetWithdrawalCount[msg.sender] = withdrawalIndex + 1;

    emit FaucetWithdraw(msg.sender, block.timestamp, amount);

    (bool sent, ) = msg.sender.call{value: amount}("");
    require(sent, "failed to send ether");
  }

}