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| // File: contracts/SafeMath.sol | |
| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.3; | |
| library SafeMath { | |
| /** | |
| * @dev Returns the addition of two unsigned integers, with an overflow flag. | |
| * | |
| * _Available since v3.4._ | |
| */ | |
| function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
| uint256 c = a + b; | |
| if (c < a) return (false, 0); | |
| return (true, c); | |
| } | |
| /** | |
| * @dev Returns the substraction of two unsigned integers, with an overflow flag. | |
| * | |
| * _Available since v3.4._ | |
| */ | |
| function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
| if (b > a) return (false, 0); | |
| return (true, a - b); | |
| } | |
| /** | |
| * @dev Returns the multiplication of two unsigned integers, with an overflow flag. | |
| * | |
| * _Available since v3.4._ | |
| */ | |
| function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
| // Gas optimization: this is cheaper than requiring 'a' not being zero, but the | |
| // benefit is lost if 'b' is also tested. | |
| // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 | |
| if (a == 0) return (true, 0); | |
| uint256 c = a * b; | |
| if (c / a != b) return (false, 0); | |
| return (true, c); | |
| } | |
| /** | |
| * @dev Returns the division of two unsigned integers, with a division by zero flag. | |
| * | |
| * _Available since v3.4._ | |
| */ | |
| function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
| if (b == 0) return (false, 0); | |
| return (true, a / b); | |
| } | |
| /** | |
| * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. | |
| * | |
| * _Available since v3.4._ | |
| */ | |
| function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
| if (b == 0) return (false, 0); | |
| return (true, a % b); | |
| } | |
| /** | |
| * @dev Returns the addition of two unsigned integers, reverting on | |
| * overflow. | |
| * | |
| * Counterpart to Solidity's `+` operator. | |
| * | |
| * Requirements: | |
| * | |
| * - Addition cannot overflow. | |
| */ | |
| function add(uint256 a, uint256 b) internal pure returns (uint256) { | |
| uint256 c = a + b; | |
| require(c >= a, "SafeMath: addition overflow"); | |
| return c; | |
| } | |
| /** | |
| * @dev Returns the subtraction of two unsigned integers, reverting on | |
| * overflow (when the result is negative). | |
| * | |
| * Counterpart to Solidity's `-` operator. | |
| * | |
| * Requirements: | |
| * | |
| * - Subtraction cannot overflow. | |
| */ | |
| function sub(uint256 a, uint256 b) internal pure returns (uint256) { | |
| require(b <= a, "SafeMath: subtraction overflow"); | |
| return a - b; | |
| } | |
| /** | |
| * @dev Returns the multiplication of two unsigned integers, reverting on | |
| * overflow. | |
| * | |
| * Counterpart to Solidity's `*` operator. | |
| * | |
| * Requirements: | |
| * | |
| * - Multiplication cannot overflow. | |
| */ | |
| function mul(uint256 a, uint256 b) internal pure returns (uint256) { | |
| if (a == 0) return 0; | |
| uint256 c = a * b; | |
| require(c / a == b, "SafeMath: multiplication overflow"); | |
| return c; | |
| } | |
| /** | |
| * @dev Returns the integer division of two unsigned integers, reverting on | |
| * division by zero. The result is rounded towards zero. | |
| * | |
| * Counterpart to Solidity's `/` operator. Note: this function uses a | |
| * `revert` opcode (which leaves remaining gas untouched) while Solidity | |
| * uses an invalid opcode to revert (consuming all remaining gas). | |
| * | |
| * Requirements: | |
| * | |
| * - The divisor cannot be zero. | |
| */ | |
| function div(uint256 a, uint256 b) internal pure returns (uint256) { | |
| require(b > 0, "SafeMath: division by zero"); | |
| return a / b; | |
| } | |
| /** | |
| * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | |
| * reverting when dividing by zero. | |
| * | |
| * Counterpart to Solidity's `%` operator. This function uses a `revert` | |
| * opcode (which leaves remaining gas untouched) while Solidity uses an | |
| * invalid opcode to revert (consuming all remaining gas). | |
| * | |
| * Requirements: | |
| * | |
| * - The divisor cannot be zero. | |
| */ | |
| function mod(uint256 a, uint256 b) internal pure returns (uint256) { | |
| require(b > 0, "SafeMath: modulo by zero"); | |
| return a % b; | |
| } | |
| /** | |
| * @dev Returns the subtraction of two unsigned integers, reverting with custom message on | |
| * overflow (when the result is negative). | |
| * | |
| * CAUTION: This function is deprecated because it requires allocating memory for the error | |
| * message unnecessarily. For custom revert reasons use {trySub}. | |
| * | |
| * Counterpart to Solidity's `-` operator. | |
| * | |
| * Requirements: | |
| * | |
| * - Subtraction cannot overflow. | |
| */ | |
| function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | |
| require(b <= a, errorMessage); | |
| return a - b; | |
| } | |
| /** | |
| * @dev Returns the integer division of two unsigned integers, reverting with custom message on | |
| * division by zero. The result is rounded towards zero. | |
| * | |
| * CAUTION: This function is deprecated because it requires allocating memory for the error | |
| * message unnecessarily. For custom revert reasons use {tryDiv}. | |
| * | |
| * Counterpart to Solidity's `/` operator. Note: this function uses a | |
| * `revert` opcode (which leaves remaining gas untouched) while Solidity | |
| * uses an invalid opcode to revert (consuming all remaining gas). | |
| * | |
| * Requirements: | |
| * | |
| * - The divisor cannot be zero. | |
| */ | |
| function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | |
| require(b > 0, errorMessage); | |
| return a / b; | |
| } | |
| /** | |
| * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | |
| * reverting with custom message when dividing by zero. | |
| * | |
| * CAUTION: This function is deprecated because it requires allocating memory for the error | |
| * message unnecessarily. For custom revert reasons use {tryMod}. | |
| * | |
| * Counterpart to Solidity's `%` operator. This function uses a `revert` | |
| * opcode (which leaves remaining gas untouched) while Solidity uses an | |
| * invalid opcode to revert (consuming all remaining gas). | |
| * | |
| * Requirements: | |
| * | |
| * - The divisor cannot be zero. | |
| */ | |
| function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | |
| require(b > 0, errorMessage); | |
| return a % b; | |
| } | |
| } | |
| // File: contracts/Timelock.sol | |
| pragma solidity ^0.8.3; | |
| contract Timelock { | |
| using SafeMath for uint; | |
| event NewAdmin(address indexed newAdmin); | |
| event NewPendingAdmin(address indexed newPendingAdmin); | |
| event NewDelay(uint indexed newDelay); | |
| event CancelTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta); | |
| event ExecuteTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta); | |
| event QueueTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta); | |
| uint public constant GRACE_PERIOD = 14 days; | |
| uint public constant MINIMUM_DELAY = 6 hours; | |
| uint public constant MAXIMUM_DELAY = 30 days; | |
| address public admin; | |
| address public pendingAdmin; | |
| uint public delay; | |
| bool public admin_initialized; | |
| mapping (bytes32 => bool) public queuedTransactions; | |
| constructor(address admin_, uint delay_) { | |
| require(delay_ >= MINIMUM_DELAY, "Timelock::constructor: Delay must exceed minimum delay."); | |
| require(delay_ <= MAXIMUM_DELAY, "Timelock::constructor: Delay must not exceed maximum delay."); | |
| admin = admin_; | |
| delay = delay_; | |
| admin_initialized = false; | |
| } | |
| // XXX: function() external payable { } | |
| receive() external payable { } | |
| function setDelay(uint delay_) public { | |
| require(msg.sender == address(this), "Timelock::setDelay: Call must come from Timelock."); | |
| require(delay_ >= MINIMUM_DELAY, "Timelock::setDelay: Delay must exceed minimum delay."); | |
| require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay."); | |
| delay = delay_; | |
| emit NewDelay(delay); | |
| } | |
| function acceptAdmin() public { | |
| require(msg.sender == pendingAdmin, "Timelock::acceptAdmin: Call must come from pendingAdmin."); | |
| admin = msg.sender; | |
| pendingAdmin = address(0); | |
| emit NewAdmin(admin); | |
| } | |
| function setPendingAdmin(address pendingAdmin_) public { | |
| // allows one time setting of admin for deployment purposes | |
| if (admin_initialized) { | |
| require(msg.sender == address(this), "Timelock::setPendingAdmin: Call must come from Timelock."); | |
| } else { | |
| require(msg.sender == admin, "Timelock::setPendingAdmin: First call must come from admin."); | |
| admin_initialized = true; | |
| } | |
| pendingAdmin = pendingAdmin_; | |
| emit NewPendingAdmin(pendingAdmin); | |
| } | |
| function queueTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public returns (bytes32) { | |
| require(msg.sender == admin, "Timelock::queueTransaction: Call must come from admin."); | |
| require(eta >= getBlockTimestamp().add(delay), "Timelock::queueTransaction: Estimated execution block must satisfy delay."); | |
| bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta)); | |
| queuedTransactions[txHash] = true; | |
| emit QueueTransaction(txHash, target, value, signature, data, eta); | |
| return txHash; | |
| } | |
| function cancelTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public { | |
| require(msg.sender == admin, "Timelock::cancelTransaction: Call must come from admin."); | |
| bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta)); | |
| queuedTransactions[txHash] = false; | |
| emit CancelTransaction(txHash, target, value, signature, data, eta); | |
| } | |
| function executeTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public payable returns (bytes memory) { | |
| require(msg.sender == admin, "Timelock::executeTransaction: Call must come from admin."); | |
| bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta)); | |
| require(queuedTransactions[txHash], "Timelock::executeTransaction: Transaction hasn't been queued."); | |
| require(getBlockTimestamp() >= eta, "Timelock::executeTransaction: Transaction hasn't surpassed time lock."); | |
| require(getBlockTimestamp() <= eta.add(GRACE_PERIOD), "Timelock::executeTransaction: Transaction is stale."); | |
| queuedTransactions[txHash] = false; | |
| bytes memory callData; | |
| if (bytes(signature).length == 0) { | |
| callData = data; | |
| } else { | |
| callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data); | |
| } | |
| // solium-disable-next-line security/no-call-value | |
| (bool success, bytes memory returnData) = target.call{value:value}(callData); | |
| require(success, "Timelock::executeTransaction: Transaction execution reverted."); | |
| emit ExecuteTransaction(txHash, target, value, signature, data, eta); | |
| return returnData; | |
| } | |
| function getBlockTimestamp() internal view returns (uint) { | |
| // solium-disable-next-line security/no-block-members | |
| return block.timestamp; | |
| } | |
| } |
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