Initial commit

solidity/faucet.sol

@@ -0,0 +1,78 @@
+pragma solidity >0.8.0;
+
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+contract EthFacuet {
+
+	address public owner;
+	address public registry;
+	uint256 public value;
+	uint256 public period;
+
+	mapping (address => uint256) public lastUsed;
+
+	event FaucetUsed(address indexed _recipient, address indexed _token, uint256 _value);
+	event FaucetFail(address indexed _recipient, address indexed _token, uint256 _value);
+	event FaucetAmountChange(uint256 _value);
+
+	constructor(address _registry, uint256 periodMinutes) {
+		registry = _registry;
+		period = periodMinutes;
+		owner = msg.sender;
+	}
+
+	function setValue(uint256 _v) public returns(uint256) {
+		require(msg.sender == owner, 'ERR_NOT_OWNER');
+		value = _v;
+		emit FaucetAmountChange(value);
+		return value;
+	}
+
+	function checkPeriod(address _recipient) private view returns(bool) {
+		if (lastUsed[_recipient] == 0) {
+			return true;
+		}
+		require(block.timestamp > lastUsed[_recipient] + period);
+		return true;
+	}
+
+	function checkRegistry(address _recipient) private returns(bool) {
+		bool _ok;
+		bytes memory _result;
+
+		(_ok, _result) = registry.call(abi.encodeWithSignature("have(address)", _recipient));
+		if (!_ok) {
+			emit FaucetFail(_recipient, address(0), value);
+			revert('ERR_TRANSFER');
+		}
+			
+		emit FaucetUsed(_recipient, address(0), value);
+		return true;
+	}
+
+	function check(address _recipient) private returns(bool) {
+		if (period > 0) {
+			checkPeriod(_recipient);
+		}
+		if (registry != address(0)) {
+			checkRegistry(_recipient);
+		}
+		return true;
+	}
+
+
+	function get() public returns(uint256) {
+		check(msg.sender);
+		payable(msg.sender).transfer(value);
+		return value;
+	}
+
+	function to(address _recipient) public returns(uint256) {
+		check(_recipient);
+		payable(_recipient).transfer(value);
+		return value;
+	}
+
+	receive () payable external {
+	}
+}