// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IResourceMetering {
    struct ResourceParams {
        uint128 prevBaseFee;
        uint64 prevBoughtGas;
        uint64 prevBlockNum;
    }

    struct ResourceConfig {
        uint32 maxResourceLimit;
        uint8 elasticityMultiplier;
        uint8 baseFeeMaxChangeDenominator;
        uint32 minimumBaseFee;
        uint32 systemTxMaxGas;
        uint128 maximumBaseFee;
    }

    error OutOfGas();

    event Initialized(uint8 version);

    function params() external view returns (uint128 prevBaseFee, uint64 prevBoughtGas, uint64 prevBlockNum); // nosemgrep

    function __constructor__() external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @title ISemver
/// @notice ISemver is a simple contract for ensuring that contracts are
///         versioned using semantic versioning.
interface ISemver {
    /// @notice Getter for the semantic version of the contract. This is not
    ///         meant to be used onchain but instead meant to be used by offchain
    ///         tooling.
    /// @return Semver contract version as a string.
    function version() external view returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;

// Libraries
import { Constants } from "src/libraries/Constants.sol";
import { NotDepositor } from "src/libraries/L1BlockErrors.sol";

// Interfaces
import { ISemver } from "interfaces/universal/ISemver.sol";

/// @custom:proxied true
/// @custom:predeploy 0x4200000000000000000000000000000000000015
/// @title L1Block
/// @notice The L1Block predeploy gives users access to information about the last known L1 block.
///         Values within this contract are updated once per epoch (every L1 block) and can only be
///         set by the "depositor" account, a special system address. Depositor account transactions
///         are created by the protocol whenever we move to a new epoch.
contract L1Block is ISemver {
    /// @notice Address of the special depositor account.
    function DEPOSITOR_ACCOUNT() public pure returns (address addr_) {
        addr_ = Constants.DEPOSITOR_ACCOUNT;
    }

    /// @notice The latest L1 block number known by the L2 system.
    uint64 public number;

    /// @notice The latest L1 timestamp known by the L2 system.
    uint64 public timestamp;

    /// @notice The latest L1 base fee.
    uint256 public basefee;

    /// @notice The latest L1 blockhash.
    bytes32 public hash;

    /// @notice The number of L2 blocks in the same epoch.
    uint64 public sequenceNumber;

    /// @notice The scalar value applied to the L1 blob base fee portion of the blob-capable L1 cost func.
    uint32 public blobBaseFeeScalar;

    /// @notice The scalar value applied to the L1 base fee portion of the blob-capable L1 cost func.
    uint32 public baseFeeScalar;

    /// @notice The versioned hash to authenticate the batcher by.
    bytes32 public batcherHash;

    /// @notice The overhead value applied to the L1 portion of the transaction fee.
    /// @custom:legacy
    uint256 public l1FeeOverhead;

    /// @notice The scalar value applied to the L1 portion of the transaction fee.
    /// @custom:legacy
    uint256 public l1FeeScalar;

    /// @notice The latest L1 blob base fee.
    uint256 public blobBaseFee;

    /// @notice The constant value applied to the operator fee.
    uint64 public operatorFeeConstant;

    /// @notice The scalar value applied to the operator fee.
    uint32 public operatorFeeScalar;

    /// @custom:semver 1.6.0
    function version() public pure virtual returns (string memory) {
        return "1.6.0";
    }

    /// @notice Returns the gas paying token, its decimals, name and symbol.
    function gasPayingToken() public pure returns (address addr_, uint8 decimals_) {
        addr_ = Constants.ETHER;
        decimals_ = 18;
    }

    /// @notice Returns the gas paying token name.
    ///         If nothing is set in state, then it means ether is used.
    ///         This function cannot be removed because WETH depends on it.
    function gasPayingTokenName() public pure returns (string memory name_) {
        name_ = "Ether";
    }

    /// @notice Returns the gas paying token symbol.
    ///         If nothing is set in state, then it means ether is used.
    ///         This function cannot be removed because WETH depends on it.
    function gasPayingTokenSymbol() public pure returns (string memory symbol_) {
        symbol_ = "ETH";
    }

    /// @notice Getter for custom gas token paying networks. Returns true if the
    ///         network uses a custom gas token.
    function isCustomGasToken() public pure returns (bool is_) {
        is_ = false;
    }

    /// @custom:legacy
    /// @notice Updates the L1 block values.
    /// @param _number         L1 blocknumber.
    /// @param _timestamp      L1 timestamp.
    /// @param _basefee        L1 basefee.
    /// @param _hash           L1 blockhash.
    /// @param _sequenceNumber Number of L2 blocks since epoch start.
    /// @param _batcherHash    Versioned hash to authenticate batcher by.
    /// @param _l1FeeOverhead  L1 fee overhead.
    /// @param _l1FeeScalar    L1 fee scalar.
    function setL1BlockValues(
        uint64 _number,
        uint64 _timestamp,
        uint256 _basefee,
        bytes32 _hash,
        uint64 _sequenceNumber,
        bytes32 _batcherHash,
        uint256 _l1FeeOverhead,
        uint256 _l1FeeScalar
    )
        external
    {
        require(msg.sender == DEPOSITOR_ACCOUNT(), "L1Block: only the depositor account can set L1 block values");

        number = _number;
        timestamp = _timestamp;
        basefee = _basefee;
        hash = _hash;
        sequenceNumber = _sequenceNumber;
        batcherHash = _batcherHash;
        l1FeeOverhead = _l1FeeOverhead;
        l1FeeScalar = _l1FeeScalar;
    }

    /// @notice Updates the L1 block values for an Ecotone upgraded chain.
    /// Params are packed and passed in as raw msg.data instead of ABI to reduce calldata size.
    /// Params are expected to be in the following order:
    ///   1. _baseFeeScalar      L1 base fee scalar
    ///   2. _blobBaseFeeScalar  L1 blob base fee scalar
    ///   3. _sequenceNumber     Number of L2 blocks since epoch start.
    ///   4. _timestamp          L1 timestamp.
    ///   5. _number             L1 blocknumber.
    ///   6. _basefee            L1 base fee.
    ///   7. _blobBaseFee        L1 blob base fee.
    ///   8. _hash               L1 blockhash.
    ///   9. _batcherHash        Versioned hash to authenticate batcher by.
    function setL1BlockValuesEcotone() public {
        _setL1BlockValuesEcotone();
    }

    /// @notice Updates the L1 block values for an Ecotone upgraded chain.
    /// Params are packed and passed in as raw msg.data instead of ABI to reduce calldata size.
    /// Params are expected to be in the following order:
    ///   1. _baseFeeScalar      L1 base fee scalar
    ///   2. _blobBaseFeeScalar  L1 blob base fee scalar
    ///   3. _sequenceNumber     Number of L2 blocks since epoch start.
    ///   4. _timestamp          L1 timestamp.
    ///   5. _number             L1 blocknumber.
    ///   6. _basefee            L1 base fee.
    ///   7. _blobBaseFee        L1 blob base fee.
    ///   8. _hash               L1 blockhash.
    ///   9. _batcherHash        Versioned hash to authenticate batcher by.
    function _setL1BlockValuesEcotone() internal {
        address depositor = DEPOSITOR_ACCOUNT();
        assembly {
            // Revert if the caller is not the depositor account.
            if xor(caller(), depositor) {
                mstore(0x00, 0x3cc50b45) // 0x3cc50b45 is the 4-byte selector of "NotDepositor()"
                revert(0x1C, 0x04) // returns the stored 4-byte selector from above
            }
            // sequencenum (uint64), blobBaseFeeScalar (uint32), baseFeeScalar (uint32)
            sstore(sequenceNumber.slot, shr(128, calldataload(4)))
            // number (uint64) and timestamp (uint64)
            sstore(number.slot, shr(128, calldataload(20)))
            sstore(basefee.slot, calldataload(36)) // uint256
            sstore(blobBaseFee.slot, calldataload(68)) // uint256
            sstore(hash.slot, calldataload(100)) // bytes32
            sstore(batcherHash.slot, calldataload(132)) // bytes32
        }
    }

    /// @notice Updates the L1 block values for an Isthmus upgraded chain.
    /// Params are packed and passed in as raw msg.data instead of ABI to reduce calldata size.
    /// Params are expected to be in the following order:
    ///   1. _baseFeeScalar        L1 base fee scalar
    ///   2. _blobBaseFeeScalar    L1 blob base fee scalar
    ///   3. _sequenceNumber       Number of L2 blocks since epoch start.
    ///   4. _timestamp            L1 timestamp.
    ///   5. _number               L1 blocknumber.
    ///   6. _basefee              L1 base fee.
    ///   7. _blobBaseFee          L1 blob base fee.
    ///   8. _hash                 L1 blockhash.
    ///   9. _batcherHash          Versioned hash to authenticate batcher by.
    ///   10. _operatorFeeScalar   Operator fee scalar.
    ///   11. _operatorFeeConstant Operator fee constant.
    function setL1BlockValuesIsthmus() public {
        _setL1BlockValuesIsthmus();
    }

    /// @notice Updates the L1 block values for an Isthmus upgraded chain.
    /// Params are packed and passed in as raw msg.data instead of ABI to reduce calldata size.
    /// Params are expected to be in the following order:
    ///   1. _baseFeeScalar        L1 base fee scalar
    ///   2. _blobBaseFeeScalar    L1 blob base fee scalar
    ///   3. _sequenceNumber       Number of L2 blocks since epoch start.
    ///   4. _timestamp            L1 timestamp.
    ///   5. _number               L1 blocknumber.
    ///   6. _basefee              L1 base fee.
    ///   7. _blobBaseFee          L1 blob base fee.
    ///   8. _hash                 L1 blockhash.
    ///   9. _batcherHash          Versioned hash to authenticate batcher by.
    ///   10. _operatorFeeScalar   Operator fee scalar.
    ///   11. _operatorFeeConstant Operator fee constant.
    function _setL1BlockValuesIsthmus() internal {
        _setL1BlockValuesEcotone();
        assembly {
            // operatorFeeScalar (uint32), operatorFeeConstant (uint64)
            sstore(operatorFeeConstant.slot, shr(160, calldataload(164)))
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Interfaces
import { IResourceMetering } from "interfaces/L1/IResourceMetering.sol";

/// @title Constants
/// @notice Constants is a library for storing constants. Simple! Don't put everything in here, just
///         the stuff used in multiple contracts. Constants that only apply to a single contract
///         should be defined in that contract instead.
library Constants {
    /// @notice Special address to be used as the tx origin for gas estimation calls in the
    ///         OptimismPortal and CrossDomainMessenger calls. You only need to use this address if
    ///         the minimum gas limit specified by the user is not actually enough to execute the
    ///         given message and you're attempting to estimate the actual necessary gas limit. We
    ///         use address(1) because it's the ecrecover precompile and therefore guaranteed to
    ///         never have any code on any EVM chain.
    address internal constant ESTIMATION_ADDRESS = address(1);

    /// @notice Value used for the L2 sender storage slot in both the OptimismPortal and the
    ///         CrossDomainMessenger contracts before an actual sender is set. This value is
    ///         non-zero to reduce the gas cost of message passing transactions.
    address internal constant DEFAULT_L2_SENDER = 0x000000000000000000000000000000000000dEaD;

    /// @notice The storage slot that holds the address of a proxy implementation.
    /// @dev `bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)`
    bytes32 internal constant PROXY_IMPLEMENTATION_ADDRESS =
        0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /// @notice The storage slot that holds the address of the owner.
    /// @dev `bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1)`
    bytes32 internal constant PROXY_OWNER_ADDRESS = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /// @notice The address that represents ether when dealing with ERC20 token addresses.
    address internal constant ETHER = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    /// @notice The address that represents the system caller responsible for L1 attributes
    ///         transactions.
    address internal constant DEPOSITOR_ACCOUNT = 0xDeaDDEaDDeAdDeAdDEAdDEaddeAddEAdDEAd0001;

    /// @notice Returns the default values for the ResourceConfig. These are the recommended values
    ///         for a production network.
    function DEFAULT_RESOURCE_CONFIG() internal pure returns (IResourceMetering.ResourceConfig memory) {
        IResourceMetering.ResourceConfig memory config = IResourceMetering.ResourceConfig({
            maxResourceLimit: 20_000_000,
            elasticityMultiplier: 10,
            baseFeeMaxChangeDenominator: 8,
            minimumBaseFee: 1 gwei,
            systemTxMaxGas: 1_000_000,
            maximumBaseFee: type(uint128).max
        });
        return config;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice Error returns when a non-depositor account tries to set L1 block values.
error NotDepositor();

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "evmVersion": "london",
  "metadata": {
    "useLiteralContent": true,
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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