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// SPDX-License-Identifier: MIT

pragma solidity 0.7.5;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/introspection/IERC165.sol";

contract Timelock is IERC165 {
  using SafeMath for uint256;

  event NewAdmin(address indexed newAdmin);
  event NewPendingAdmin(address indexed newPendingAdmin);
  event NewDelay(uint256 indexed newDelay);
  event CancelTransaction(
    bytes32 indexed txHash,
    address indexed target,
    uint256 value,
    string signature,
    bytes data,
    uint256 eta
  );
  event ExecuteTransaction(
    bytes32 indexed txHash,
    address indexed target,
    uint256 value,
    string signature,
    bytes data,
    uint256 eta
  );
  event QueueTransaction(
    bytes32 indexed txHash,
    address indexed target,
    uint256 value,
    string signature,
    bytes data,
    uint256 eta
  );

  uint256 public constant GRACE_PERIOD = 14 days;
  uint256 public constant MINIMUM_DELAY = 2 days;
  uint256 public constant MAXIMUM_DELAY = 30 days;

  address public admin;
  address public pendingAdmin;
  uint256 public delay;

  /**
   * @dev the computed interface ID according to ERC-165. The interface ID is a XOR of interface method selectors.
   * queueTransaction.selector ^
   * cancelTransaction.selector ^
   * executeTransaction.selector  =>  0x6b5cc770
   */
  bytes4 private constant _INTERFACE_ID_TIMELOCK = 0x6b5cc770;

  /// @dev bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
  bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

  mapping(bytes32 => bool) public queuedTransactions;

  constructor(address admin_, uint256 delay_) {
    require(
      delay_ >= MINIMUM_DELAY,
      "Timelock::constructor: Delay must exceed minimum delay."
    );
    require(
      delay_ <= MAXIMUM_DELAY,
      "Timelock::setDelay: Delay must not exceed maximum delay."
    );

    admin = admin_;
    delay = delay_;
  }

  receive() external payable {}

  function setDelay(uint256 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);
  }

  /**
   * @notice ERC165 Standard for support of interfaces
   * @param _interfaceId bytes of interface
   * @return bool
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    pure
    override
    returns (bool)
  {
    return (_interfaceId == _INTERFACE_ID_TIMELOCK ||
      _interfaceId == _INTERFACE_ID_ERC165);
  }

  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 {
    require(
      msg.sender == address(this),
      "Timelock::setPendingAdmin: Call must come from Timelock."
    );
    pendingAdmin = pendingAdmin_;

    emit NewPendingAdmin(pendingAdmin);
  }

  function queueTransaction(
    address target,
    uint256 value,
    string memory signature,
    bytes memory data,
    uint256 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,
    uint256 value,
    string memory signature,
    bytes memory data,
    uint256 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,
    uint256 value,
    string memory signature,
    bytes memory data,
    uint256 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 (uint256) {
    // solium-disable-next-line security/no-block-members
    return block.timestamp;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000271901c3268d0959bbc9543de4f073d3708c88f7000000000000000000000000000000000000000000000000000000000003f480

-----Decoded View---------------
Arg [0] : admin_ (address): 0x271901c3268D0959bbc9543DE4f073D3708C88F7
Arg [1] : delay_ (uint256): 259200

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000271901c3268d0959bbc9543de4f073d3708c88f7
Arg [1] : 000000000000000000000000000000000000000000000000000000000003f480