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eth-faucet
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Add backend sealing, external period checker

This commit is contained in:
lash 2023-02-03 07:21:38 +00:00
parent daafa36f4e
commit aafe47eb19
Signed by: lash
GPG Key ID: 21D2E7BB88C2A746
3 changed files with 143 additions and 78 deletions
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110
solidity/EthFaucet.sol Normal file
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pragma solidity >0.8.0;
// SPDX-License-Identifier: GPL-3.0-or-later
contract EthFacuet {
address public owner;
address public registry;
address public periodChecker;
uint256 public sealState;
uint256 public value;
uint8 constant REGISTRY_STATE = 1;
uint8 constant PERIODCHECKER_STATE = 2;
uint8 constant VALUE_STATE = 4;
uint256 constant public maxSealState = 7;
event FaucetUsed(address indexed _recipient, address indexed _token, uint256 _value);
event FaucetFail(address indexed _recipient, address indexed _token, uint256 _value);
event FaucetAmountChange(uint256 _value);
event FaucetStateChange(uint256 indexed _sealState, address _registry, address _periodChecker);
constructor() {
owner = msg.sender;
}
function seal(uint256 _state) public returns(uint256) {
require(_state < 8, 'ERR_INVALID_STATE');
require(_state & sealState == 0, 'ERR_ALREADY_LOCKED');
sealState |= _state;
emit FaucetStateChange(sealState, registry, periodChecker);
return uint256(sealState);
}
function setValue(uint256 _v) public returns(uint256) {
require(msg.sender == owner, 'ERR_NOT_OWNER');
require(sealState & VALUE_STATE == 0, 'ERR_SEALED');
value = _v;
emit FaucetAmountChange(value);
return value;
}
function setPeriodChecker(address _checker) public {
require(msg.sender == owner, 'ERR_NOT_OWNER');
require(sealState & PERIODCHECKER_STATE == 0, 'ERR_SEALED');
periodChecker = _checker;
emit FaucetStateChange(sealState, registry, periodChecker);
}
function setRegistry(address _registry) public {
require(msg.sender == owner, 'ERR_NOT_OWNER');
require(sealState & REGISTRY_STATE == 0, 'ERR_SEALED');
registry = _registry;
emit FaucetStateChange(sealState, registry, periodChecker);
}
function checkPeriod(address _recipient) private returns(bool) {
bool _ok;
bytes memory _result;
(_ok, _result) = periodChecker.call(abi.encodeWithSignature("check(address)", _recipient));
if (!_ok) {
revert('ERR_PERIOD_BACKEND_ERROR');
}
if (_result[31] == 0) {
revert('ERR_PERIOD_CHECK');
}
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 (periodChecker != address(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 {
}
}

33
solidity/PeriodSimple.sol Normal file
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pragma solidity >0.8.0;
// SPDX-License-Identifier: GPL-3.0-or-later
contract PeriodSimple {
address public owner;
address public poker;
uint256 public period;
mapping (address => uint256) public lastUsed;
event PeriodChange(uint256 _value);
constructor() {
owner = msg.sender;
poker = owner;
}
function setPeriod(uint256 _period) public {
require(owner == msg.sender, 'ERR_NOT_OWNER');
period = _period;
}
function check(address _subject) public view returns(bool) {
return block.timestamp < lastUsed[_subject] + period;
}
function poke(address _subject) public {
require(msg.sender == owner || msg.sender == poker, 'ERR_ACCESS');
require(check(_subject), 'ERR_PREMATURE');
lastUsed[_subject] = block.timestamp;
}
}

78
solidity/faucet.sol
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@ -1,78 +0,0 @@
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 {
}
}