Created
February 17, 2023 12:17
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.3; | |
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; | |
contract ERC20Faucet { | |
ERC20 public token; | |
address public owner; | |
// units of token allowed for tapping into the faucet | |
uint256 public dailyLimit; | |
mapping(address => uint) public lockTime; | |
event Tapped(address from, uint256 amount); | |
constructor(address _token, uint256 _dailyLimit) { | |
token = ERC20(_token); | |
owner = msg.sender; | |
dailyLimit = _dailyLimit; | |
} | |
function totalSupply() external view returns (uint256) { | |
return token.balanceOf(address(this)); | |
} | |
function tap() public { | |
require(block.timestamp > lockTime[msg.sender], "No soup for you!"); | |
uint8 decimals = token.decimals(); | |
uint256 amount = dailyLimit * (10**decimals); | |
require(this.totalSupply() >= amount, "Insufficient supply"); | |
lockTime[msg.sender] = block.timestamp + 1 days; | |
token.transfer(msg.sender, amount); | |
emit Tapped(msg.sender, dailyLimit); | |
} | |
} |
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