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"content": "/**\n *Submitted for verification at Etherscan.io on 2019-10-11\n */\n\n// File: contracts/SafeMath.sol\n\npragma solidity ^0.5.8;\n\n// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/Math.sol\n// Subject to the MIT license.\n// https://etherscan.io/address/0x6d903f6003cca6255d85cca4d3b5e5146dc33925#code\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it's recommended to use it always.\n */\nlibrary SafeMath {\n /**\n * @dev Returns the addition of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `+` operator.\n *\n * Requirements:\n * - Addition cannot overflow.\n */\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 c = a + b;\n require(c >= a, \"SafeMath: addition overflow\");\n\n return c;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n * - Subtraction cannot overflow.\n */\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n return sub(a, b, \"SafeMath: subtraction overflow\");\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n * - Subtraction cannot overflow.\n *\n * NOTE: This is a feature of the next version of OpenZeppelin Contracts.\n * @dev Get it via `npm install @openzeppelin/contracts@next`.\n */\n function sub(\n uint256 a,\n uint256 b,\n string memory errorMessage\n ) internal pure returns (uint256) {\n require(b <= a, errorMessage);\n uint256 c = a - b;\n\n return c;\n }\n\n /**\n * @dev Returns the multiplication of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `*` operator.\n *\n * Requirements:\n * - Multiplication cannot overflow.\n */\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n // benefit is lost if 'b' is also tested.\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n if (a == 0) {\n return 0;\n }\n\n uint256 c = a * b;\n require(c / a == b, \"SafeMath: multiplication overflow\");\n\n return c;\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers. Reverts on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `/` operator. Note: this function uses a\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\n * uses an invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n */\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\n return div(a, b, \"SafeMath: division by zero\");\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `/` operator. Note: this function uses a\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\n * uses an invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n * NOTE: This is a feature of the next version of OpenZeppelin Contracts.\n * @dev Get it via `npm install @openzeppelin/contracts@next`.\n */\n function div(\n uint256 a,\n uint256 b,\n string memory errorMessage\n ) internal pure returns (uint256) {\n // Solidity only automatically asserts when dividing by 0\n require(b > 0, errorMessage);\n uint256 c = a / b;\n // assert(a == b * c + a % b); // There is no case in which this doesn't hold\n\n return c;\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * Reverts when dividing by zero.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n */\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n return mod(a, b, \"SafeMath: modulo by zero\");\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * Reverts with custom message when dividing by zero.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n *\n * NOTE: This is a feature of the next version of OpenZeppelin Contracts.\n * @dev Get it via `npm install @openzeppelin/contracts@next`.\n */\n function mod(\n uint256 a,\n uint256 b,\n string memory errorMessage\n ) internal pure returns (uint256) {\n require(b != 0, errorMessage);\n return a % b;\n }\n}\n\n// File: contracts/Timelock.sol\n\npragma solidity ^0.5.8;\n\ncontract Timelock {\n using SafeMath for uint;\n\n event NewAdmin(address indexed newAdmin);\n event NewPendingAdmin(address indexed newPendingAdmin);\n event NewDelay(uint indexed newDelay);\n event CancelTransaction(\n bytes32 indexed txHash,\n address indexed target,\n uint value,\n string signature,\n bytes data,\n uint eta\n );\n event ExecuteTransaction(\n bytes32 indexed txHash,\n address indexed target,\n uint value,\n string signature,\n bytes data,\n uint eta\n );\n event QueueTransaction(\n bytes32 indexed txHash,\n address indexed target,\n uint value,\n string signature,\n bytes data,\n uint eta\n );\n\n uint public constant GRACE_PERIOD = 14 days;\n uint public constant MINIMUM_DELAY = 1 days;\n uint public constant MAXIMUM_DELAY = 30 days;\n\n address public admin;\n address public pendingAdmin;\n uint public delay;\n\n mapping(bytes32 => bool) public queuedTransactions;\n\n constructor(address admin_, uint delay_) public {\n require(\n delay_ >= MINIMUM_DELAY,\n \"Timelock::constructor: Delay must exceed minimum delay.\"\n );\n require(\n delay_ <= MAXIMUM_DELAY,\n \"Timelock::setDelay: Delay must not exceed maximum delay.\"\n );\n\n admin = admin_;\n delay = delay_;\n }\n\n function() external payable {}\n\n function setDelay(uint delay_) public {\n require(\n msg.sender == address(this),\n \"Timelock::setDelay: Call must come from Timelock.\"\n );\n require(\n delay_ >= MINIMUM_DELAY,\n \"Timelock::setDelay: Delay must exceed minimum delay.\"\n );\n require(\n delay_ <= MAXIMUM_DELAY,\n \"Timelock::setDelay: Delay must not exceed maximum delay.\"\n );\n delay = delay_;\n\n emit NewDelay(delay);\n }\n\n function acceptAdmin() public {\n require(\n msg.sender == pendingAdmin,\n \"Timelock::acceptAdmin: Call must come from pendingAdmin.\"\n );\n admin = msg.sender;\n pendingAdmin = address(0);\n\n emit NewAdmin(admin);\n }\n\n function setPendingAdmin(address pendingAdmin_) public {\n require(\n msg.sender == address(this),\n \"Timelock::setPendingAdmin: Call must come from Timelock.\"\n );\n pendingAdmin = pendingAdmin_;\n\n emit NewPendingAdmin(pendingAdmin);\n }\n\n function queueTransaction(\n address target,\n uint value,\n string memory signature,\n bytes memory data,\n uint eta\n ) public returns (bytes32) {\n require(\n msg.sender == admin,\n \"Timelock::queueTransaction: Call must come from admin.\"\n );\n require(\n eta >= getBlockTimestamp().add(delay),\n \"Timelock::queueTransaction: Estimated execution block must satisfy delay.\"\n );\n\n bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));\n queuedTransactions[txHash] = true;\n\n emit QueueTransaction(txHash, target, value, signature, data, eta);\n return txHash;\n }\n\n function cancelTransaction(\n address target,\n uint value,\n string memory signature,\n bytes memory data,\n uint eta\n ) public {\n require(\n msg.sender == admin,\n \"Timelock::cancelTransaction: Call must come from admin.\"\n );\n\n bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));\n queuedTransactions[txHash] = false;\n\n emit CancelTransaction(txHash, target, value, signature, data, eta);\n }\n\n function executeTransaction(\n address target,\n uint value,\n string memory signature,\n bytes memory data,\n uint eta\n ) public payable returns (bytes memory) {\n require(\n msg.sender == admin,\n \"Timelock::executeTransaction: Call must come from admin.\"\n );\n\n bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));\n require(\n queuedTransactions[txHash],\n \"Timelock::executeTransaction: Transaction hasn't been queued.\"\n );\n require(\n getBlockTimestamp() >= eta,\n \"Timelock::executeTransaction: Transaction hasn't surpassed time lock.\"\n );\n require(\n getBlockTimestamp() <= eta.add(GRACE_PERIOD),\n \"Timelock::executeTransaction: Transaction is stale.\"\n );\n\n queuedTransactions[txHash] = false;\n\n bytes memory callData;\n\n if (bytes(signature).length == 0) {\n callData = data;\n } else {\n callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data);\n }\n\n // solium-disable-next-line security/no-call-value\n (bool success, bytes memory returnData) = target.call.value(value)(\n callData\n );\n require(\n success,\n \"Timelock::executeTransaction: Transaction execution reverted.\"\n );\n\n emit ExecuteTransaction(txHash, target, value, signature, data, eta);\n\n return returnData;\n }\n\n function getBlockTimestamp() internal view returns (uint) {\n // solium-disable-next-line security/no-block-members\n return block.timestamp;\n }\n}\n"
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