Contract Source Code (Solidity)

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• interface ArbSys
•    - function arbOSVersion()
•    - function arbChainID()
•    - function arbBlockNumber()
•    - function withdrawEth(address destinat ...
•    - function sendTxToL1(address destinati ...
•    - function getTransactionCount(address ...
•    - function getStorageAt(address account ...
•    - function isTopLevelCall()
•    - function sendTxToL1(
•    - function applyL1ToL2Alias(address l1A ...
•  contract L2GovernanceRelay is L2Cr ... *
•    - function relay(address target, bytes ...

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/**
 *Submitted for verification at Nova.Arbiscan.io on 2022-10-28
*/

// SPDX-License-Identifier: AGPL-3.0-or-later
// Copyright (C) 2022 Dai Foundation
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

pragma solidity ^0.6.11;


/**
 * @title Precompiled contract that exists in every Arbitrum chain at address(100), 0x0000000000000000000000000000000000000064. Exposes a variety of system-level functionality.
 */
interface ArbSys {
  /**
   * @notice Get internal version number identifying an ArbOS build
   * @return version number as int
   */
  function arbOSVersion() external pure returns (uint256);

  function arbChainID() external view returns (uint256);

  /**
   * @notice Get Arbitrum block number (distinct from L1 block number; Arbitrum genesis block has block number 0)
   * @return block number as int
   */
  function arbBlockNumber() external view returns (uint256);

  /**
   * @notice Send given amount of Eth to dest from sender.
   * This is a convenience function, which is equivalent to calling sendTxToL1 with empty calldataForL1.
   * @param destination recipient address on L1
   * @return unique identifier for this L2-to-L1 transaction.
   */
  function withdrawEth(address destination) external payable returns (uint256);

  /**
   * @notice Send a transaction to L1
   * @param destination recipient address on L1
   * @param calldataForL1 (optional) calldata for L1 contract call
   * @return a unique identifier for this L2-to-L1 transaction.
   */
  function sendTxToL1(address destination, bytes calldata calldataForL1)
    external
    payable
    returns (uint256);

  /**
   * @notice get the number of transactions issued by the given external account or the account sequence number of the given contract
   * @param account target account
   * @return the number of transactions issued by the given external account or the account sequence number of the given contract
   */
  function getTransactionCount(address account) external view returns (uint256);

  /**
   * @notice get the value of target L2 storage slot
   * This function is only callable from address 0 to prevent contracts from being able to call it
   * @param account target account
   * @param index target index of storage slot
   * @return stotage value for the given account at the given index
   */
  function getStorageAt(address account, uint256 index) external view returns (uint256);

  /**
   * @notice check if current call is coming from l1
   * @return true if the caller of this was called directly from L1
   */
  function isTopLevelCall() external view returns (bool);

  event EthWithdrawal(address indexed destAddr, uint256 amount);

  event L2ToL1Transaction(
    address caller,
    address indexed destination,
    uint256 indexed uniqueId,
    uint256 indexed batchNumber,
    uint256 indexInBatch,
    uint256 arbBlockNum,
    uint256 ethBlockNum,
    uint256 timestamp,
    uint256 callvalue,
    bytes data
  );
}

abstract contract L2CrossDomainEnabled {
  event TxToL1(address indexed from, address indexed to, uint256 indexed id, bytes data);

  function sendTxToL1(
    address user,
    address to,
    bytes memory data
  ) internal returns (uint256) {
    // note: this method doesn't support sending ether to L1 together with a call
    uint256 id = ArbSys(address(100)).sendTxToL1(to, data);

    emit TxToL1(user, to, id, data);

    return id;
  }

  modifier onlyL1Counterpart(address l1Counterpart) {
    require(msg.sender == applyL1ToL2Alias(l1Counterpart), "ONLY_COUNTERPART_GATEWAY");
    _;
  }

  uint160 constant offset = uint160(0x1111000000000000000000000000000000001111);

  // l1 addresses are transformed durng l1->l2 calls
  function applyL1ToL2Alias(address l1Address) internal pure returns (address l2Address) {
    l2Address = address(uint160(l1Address) + offset);
  }
}

// Receive xchain message from L1 counterpart and execute given spell

contract L2GovernanceRelay is L2CrossDomainEnabled {
  address public immutable l1GovernanceRelay;

  constructor(address _l1GovernanceRelay) public {
    l1GovernanceRelay = _l1GovernanceRelay;
  }

  // Allow contract to receive ether
  receive() external payable {}

  function relay(address target, bytes calldata targetData)
    external
    onlyL1Counterpart(l1GovernanceRelay)
  {
    (bool ok, ) = target.delegatecall(targetData);
    // note: even if a retryable call fails, it can be retried
    require(ok, "L2GovernanceRelay/delegatecall-error");
  }
}

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[{"inputs":[{"internalType":"address","name":"_l1GovernanceRelay","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"id","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"TxToL1","type":"event"},{"inputs":[],"name":"l1GovernanceRelay","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"targetData","type":"bytes"}],"name":"relay","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000b90ab1055fc1d314be197f2385a2900347621d78

-----Decoded View---------------
Arg [0] : _l1GovernanceRelay (address): 0xb90Ab1055fC1d314be197F2385a2900347621d78

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b90ab1055fc1d314be197f2385a2900347621d78

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ipfs://89875e30cae1ec85c01cfd52f980d2fa8eb70cfc7ddb3c5e688b22101516c144