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// SPDX-License-Identifier: MIT

pragma solidity =0.8.24;

import {OwnableBase} from "../../libraries/common/OwnableBase.sol";
import {IWhitelist} from "../../libraries/common/IWhitelist.sol";

import {IL1GasPriceOracle} from "./IL1GasPriceOracle.sol";

contract L1GasPriceOracle is OwnableBase, IL1GasPriceOracle {
    /**********
     * Events *
     **********/

    /// @notice Emitted when owner updates whitelist contract.
    /// @param _oldWhitelist The address of old whitelist contract.
    /// @param _newWhitelist The address of new whitelist contract.
    event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);

    /**********
     * Errors *
     **********/

    /// @dev Thrown when the blob fee scalar exceed `MAX_BLOB_SCALAR`.
    error ErrExceedMaxBlobScalar();

    /// @dev Thrown when the commit fee scalar exceed `MAX_COMMIT_SCALAR`.
    error ErrExceedMaxCommitScalar();

    /// @dev Thrown when the l1 fee overhead exceed `MAX_OVERHEAD`.
    error ErrExceedMaxOverhead();

    /// @dev Thrown when the l1 fee scalar exceed `MAX_SCALAR`.
    error ErrExceedMaxScalar();

    /// @dev Thrown when the caller is not whitelisted.
    error ErrCallerNotWhitelisted();

    /// @dev Thrown when we enable Curie fork after Curie fork.
    error ErrAlreadyInCurieFork();

    /*************
     * Constants *
     *************/

    /// @dev The precision used in the scalar.
    uint256 private constant PRECISION = 1e9;

    /// @dev The maximum possible l1 fee overhead.
    ///      Computed based on current l1 block gas limit.
    uint256 private constant MAX_OVERHEAD = 30000000 / 16;

    /// @dev The maximum possible l1 fee scale before Curie.
    ///      x1000 should be enough.
    uint256 private constant MAX_SCALAR = 1000 * PRECISION;

    /// @dev The maximum possible l1 commit fee scalar after Curie.
    /// We derive the commit scalar by
    /// ```
    /// commit_scalar = commit_gas_per_tx * fluctuation_multiplier * 1e9
    /// ```
    /// So, the value should not exceed 10^9 * 1e9 normally.
    uint256 private constant MAX_COMMIT_SCALAR = 10 ** 9 * PRECISION;

    /// @dev The maximum possible l1 blob fee scalar after Curie.
    /// We derive the blob scalar by
    /// ```
    /// blob_scalar = fluctuation_multiplier / compression_ratio / blob_util_ratio * 1e9
    /// ```
    /// So, the value should not exceed 10^9 * 1e9 normally.
    uint256 private constant MAX_BLOB_SCALAR = 10 ** 9 * PRECISION;

    /*************
     * Variables *
     *************/

    /// @inheritdoc IL1GasPriceOracle
    uint256 public l1BaseFee;

    /// @inheritdoc IL1GasPriceOracle
    uint256 public override overhead;

    /// @inheritdoc IL1GasPriceOracle
    uint256 public override scalar;

    /// @notice The address of whitelist contract.
    IWhitelist public whitelist;

    /// @inheritdoc IL1GasPriceOracle
    uint256 public override l1BlobBaseFee;

    /// @inheritdoc IL1GasPriceOracle
    uint256 public override commitScalar;

    /// @inheritdoc IL1GasPriceOracle
    uint256 public override blobScalar;

    /// @notice Indicates whether the network has gone through the Curie upgrade.
    bool public isCurie;

    /*************
     * Modifiers *
     *************/

    modifier onlyWhitelistedSender() {
        if (!whitelist.isSenderAllowed(msg.sender)) revert ErrCallerNotWhitelisted();
        _;
    }

    /***************
     * Constructor *
     ***************/

    constructor(address _owner) {
        _transferOwnership(_owner);
    }

    /*************************
     * Public View Functions *
     *************************/

    /// @inheritdoc IL1GasPriceOracle
    function getL1Fee(bytes memory _data) external view override returns (uint256) {
        if (isCurie) {
            return _getL1FeeCurie(_data);
        } else {
            return _getL1FeeBeforeCurie(_data);
        }
    }

    /// @inheritdoc IL1GasPriceOracle
    function getL1GasUsed(bytes memory _data) public view override returns (uint256) {
        if (isCurie) {
            // It is near zero since we put all transactions to blob.
            return 0;
        } else {
            return _getL1GasUsedBeforeCurie(_data);
        }
    }

    /*****************************
     * Public Mutating Functions *
     *****************************/

    /// @inheritdoc IL1GasPriceOracle
    function setL1BaseFee(uint256 _l1BaseFee) external override onlyWhitelistedSender {
        l1BaseFee = _l1BaseFee;

        emit L1BaseFeeUpdated(_l1BaseFee);
    }

    /// @inheritdoc IL1GasPriceOracle
    function setL1BaseFeeAndBlobBaseFee(
        uint256 _l1BaseFee,
        uint256 _l1BlobBaseFee
    ) external override onlyWhitelistedSender {
        l1BaseFee = _l1BaseFee;
        l1BlobBaseFee = _l1BlobBaseFee;

        emit L1BaseFeeUpdated(_l1BaseFee);
        emit L1BlobBaseFeeUpdated(_l1BlobBaseFee);
    }

    /************************
     * Restricted Functions *
     ************************/

    /// @notice Allows the owner to modify the overhead.
    /// @param _overhead New overhead
    function setOverhead(uint256 _overhead) external onlyOwner {
        if (_overhead > MAX_OVERHEAD) revert ErrExceedMaxOverhead();

        overhead = _overhead;
        emit OverheadUpdated(_overhead);
    }

    /// Allows the owner to modify the scalar.
    /// @param _scalar New scalar
    function setScalar(uint256 _scalar) external onlyOwner {
        if (_scalar > MAX_SCALAR) revert ErrExceedMaxScalar();

        scalar = _scalar;
        emit ScalarUpdated(_scalar);
    }

    /// Allows the owner to modify the commit scalar.
    /// @param _scalar New scalar
    function setCommitScalar(uint256 _scalar) external onlyOwner {
        if (_scalar > MAX_COMMIT_SCALAR) revert ErrExceedMaxCommitScalar();

        commitScalar = _scalar;
        emit CommitScalarUpdated(_scalar);
    }

    /// Allows the owner to modify the blob scalar.
    /// @param _scalar New scalar
    function setBlobScalar(uint256 _scalar) external onlyOwner {
        if (_scalar > MAX_BLOB_SCALAR) revert ErrExceedMaxBlobScalar();

        blobScalar = _scalar;
        emit BlobScalarUpdated(_scalar);
    }

    /// @notice Update whitelist contract.
    /// @dev This function can only called by contract owner.
    /// @param _newWhitelist The address of new whitelist contract.
    function updateWhitelist(address _newWhitelist) external onlyOwner {
        address _oldWhitelist = address(whitelist);

        whitelist = IWhitelist(_newWhitelist);
        emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
    }

    /// @notice Enable the Curie fork (callable by contract owner).
    ///
    /// @dev Since this is a predeploy contract, we will directly set the slot while hard fork
    /// to avoid external owner operations.
    /// The reason that we keep this function is for easy unit testing.
    function enableCurie() external onlyOwner {
        if (isCurie) revert ErrAlreadyInCurieFork();
        isCurie = true;
    }

    /**********************
     * Internal Functions *
     **********************/

    /// @dev Internal function to computes the amount of L1 gas used for a transaction before Curie fork.
    ///   The `_data` is the RLP-encoded transaction with signature. And we also reserve additional
    ///   4 bytes in the non-zero bytes to store the number of bytes in the RLP-encoded transaction.
    /// @param _data Signed fully RLP-encoded transaction to get the L1 gas for.
    /// @return Amount of L1 gas used to publish the transaction.
    function _getL1GasUsedBeforeCurie(bytes memory _data) private view returns (uint256) {
        uint256 _total = 0;
        uint256 _length = _data.length;
        unchecked {
            for (uint256 i = 0; i < _length; i++) {
                if (_data[i] == 0) {
                    _total += 4;
                } else {
                    _total += 16;
                }
            }
            return _total + overhead + (4 * 16);
        }
    }

    /// @dev Internal function to compute the L1 portion of the fee based on the size of the rlp encoded input
    ///   transaction, the current L1 base fee, and the various dynamic parameters, before Curie fork.
    /// @param _data Signed fully RLP-encoded transaction to get the L1 fee for.
    /// @return L1 fee that should be paid for the tx
    function _getL1FeeBeforeCurie(bytes memory _data) private view returns (uint256) {
        uint256 _l1GasUsed = _getL1GasUsedBeforeCurie(_data);
        uint256 _l1Fee = _l1GasUsed * l1BaseFee;
        return (_l1Fee * scalar) / PRECISION;
    }

    /// @dev Internal function to compute the L1 portion of the fee based on the size of the rlp encoded input
    ///   transaction, the current L1 base fee, and the various dynamic parameters, after Curie fork.
    /// @param _data Signed fully RLP-encoded transaction to get the L1 fee for.
    /// @return L1 fee that should be paid for the tx
    function _getL1FeeCurie(bytes memory _data) private view returns (uint256) {
        // We have bounded the value of `commitScalar` and `blobScalar`, the whole expression won't overflow.
        return (commitScalar * l1BaseFee + blobScalar * _data.length * l1BlobBaseFee) / PRECISION;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

abstract contract OwnableBase {
    /**********
     * Events *
     **********/

    /// @notice Emitted when owner is changed by current owner.
    /// @param _oldOwner The address of previous owner.
    /// @param _newOwner The address of new owner.
    event OwnershipTransferred(address indexed _oldOwner, address indexed _newOwner);

    /*************
     * Variables *
     *************/

    /// @notice The address of the current owner.
    address public owner;

    /**********************
     * Function Modifiers *
     **********************/

    /// @dev Throws if called by any account other than the owner.
    modifier onlyOwner() {
        require(owner == msg.sender, "caller is not the owner");
        _;
    }

    /************************
     * Restricted Functions *
     ************************/

    /// @notice Leaves the contract without owner. It will not be possible to call
    /// `onlyOwner` functions anymore. Can only be called by the current owner.
    ///
    /// @dev Renouncing ownership will leave the contract without an owner,
    /// thereby removing any functionality that is only available to the owner.
    function renounceOwnership() public onlyOwner {
        _transferOwnership(address(0));
    }

    /// @notice Transfers ownership of the contract to a new account (`newOwner`).
    /// Can only be called by the current owner.
    function transferOwnership(address _newOwner) public onlyOwner {
        require(_newOwner != address(0), "new owner is the zero address");
        _transferOwnership(_newOwner);
    }

    /**********************
     * Internal Functions *
     **********************/

    /// @dev Transfers ownership of the contract to a new account (`newOwner`).
    /// Internal function without access restriction.
    function _transferOwnership(address _newOwner) internal {
        address _oldOwner = owner;
        owner = _newOwner;
        emit OwnershipTransferred(_oldOwner, _newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

interface IWhitelist {
    /// @notice Check whether the sender is allowed to do something.
    /// @param _sender The address of sender.
    function isSenderAllowed(address _sender) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.24;

interface IL1GasPriceOracle {
    /**********
     * Events *
     **********/

    /// @notice Emitted when current fee overhead is updated.
    /// @param overhead The current fee overhead updated.
    event OverheadUpdated(uint256 overhead);

    /// @notice Emitted when current fee scalar is updated.
    /// @param scalar The current fee scalar updated.
    event ScalarUpdated(uint256 scalar);

    /// @notice Emitted when current commit fee scalar is updated.
    /// @param scalar The current commit fee scalar updated.
    event CommitScalarUpdated(uint256 scalar);

    /// @notice Emitted when current blob fee scalar is updated.
    /// @param scalar The current blob fee scalar updated.
    event BlobScalarUpdated(uint256 scalar);

    /// @notice Emitted when current l1 base fee is updated.
    /// @param l1BaseFee The current l1 base fee updated.
    event L1BaseFeeUpdated(uint256 l1BaseFee);

    /// @notice Emitted when current l1 blob base fee is updated.
    /// @param l1BlobBaseFee The current l1 blob base fee updated.
    event L1BlobBaseFeeUpdated(uint256 l1BlobBaseFee);

    /*************************
     * Public View Functions *
     *************************/

    /// @notice Return the current l1 fee overhead.
    function overhead() external view returns (uint256);

    /// @notice Return the current l1 fee scalar before Curie fork.
    function scalar() external view returns (uint256);

    /// @notice Return the current l1 commit fee scalar.
    function commitScalar() external view returns (uint256);

    /// @notice Return the current l1 blob fee scalar.
    function blobScalar() external view returns (uint256);

    /// @notice Return the latest known l1 base fee.
    function l1BaseFee() external view returns (uint256);

    /// @notice Return the latest known l1 blob base fee.
    function l1BlobBaseFee() external view returns (uint256);

    /// @notice Computes the L1 portion of the fee based on the size of the rlp encoded input
    ///         transaction, the current L1 base fee, and the various dynamic parameters.
    /// @param data Signed fully RLP-encoded transaction to get the L1 fee for.
    /// @return L1 fee that should be paid for the tx
    function getL1Fee(bytes memory data) external view returns (uint256);

    /// @notice Computes the amount of L1 gas used for a transaction. Adds the overhead which
    ///         represents the per-transaction gas overhead of posting the transaction and state
    ///         roots to L1. Adds 74 bytes of padding to account for the fact that the input does
    ///         not have a signature.
    /// @param data Signed fully RLP-encoded transaction to get the L1 gas for.
    /// @return Amount of L1 gas used to publish the transaction.
    function getL1GasUsed(bytes memory data) external view returns (uint256);

    /*****************************
     * Public Mutating Functions *
     *****************************/

    /// @notice Allows whitelisted caller to modify the l1 base fee.
    /// @param _l1BaseFee New l1 base fee.
    function setL1BaseFee(uint256 _l1BaseFee) external;

    /// @notice Allows whitelisted caller to modify the l1 base fee.
    /// @param _l1BaseFee New l1 base fee.
    /// @param _l1BlobBaseFee New l1 blob base fee.
    function setL1BaseFeeAndBlobBaseFee(uint256 _l1BaseFee, uint256 _l1BlobBaseFee) external;
}

{
  "remappings": [
    "hardhat/=node_modules/hardhat/",
    "forge-std/=lib/forge-std/src/",
    "ds-test/=lib/ds-test/src/",
    "solmate/=lib/solmate/src/",
    "@openzeppelin/=node_modules/@openzeppelin/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "": [
        "ast"
      ],
      "*": [
        "abi",
        "evm.bytecode",
        "evm.deployedBytecode",
        "evm.methodIdentifiers",
        "metadata"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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"setBlobScalar","inputs": [{"name": "_scalar","type": "uint256","internalType": "uint256"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "setCommitScalar","inputs": [{"name": "_scalar","type": "uint256","internalType": "uint256"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "setL1BaseFee","inputs": [{"name": "_l1BaseFee","type": "uint256","internalType": "uint256"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "setL1BaseFeeAndBlobBaseFee","inputs": [{"name": "_l1BaseFee","type": "uint256","internalType": "uint256"},{"name": "_l1BlobBaseFee","type": "uint256","internalType": "uint256"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "setOverhead","inputs": [{"name": "_overhead","type": "uint256","internalType": "uint256"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "setScalar","inputs": [{"name": "_scalar","type": "uint256","internalType": "uint256"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "transferOwnership","inputs": [{"name": "_newOwner","type": "address","internalType": "address"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "updateWhitelist","inputs": [{"name": "_newWhitelist","type": "address","internalType": "address"}],"outputs": [],"stateMutability": "nonpayable"},{"type": "function","name": "whitelist","inputs": [],"outputs": [{"name": "","type": "address","internalType": "contract IWhitelist"}],"stateMutability": "view"},{"type": "event","name": "BlobScalarUpdated","inputs": [{"name": "scalar","type": "uint256","indexed": false,"internalType": "uint256"}],"anonymous": false},{"type": "event","name": "CommitScalarUpdated","inputs": [{"name": "scalar","type": "uint256","indexed": false,"internalType": "uint256"}],"anonymous": false},{"type": "event","name": "L1BaseFeeUpdated","inputs": [{"name": "l1BaseFee","type": 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