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// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.4;

import "./AbsOutbox.sol";

contract Outbox is AbsOutbox {
    /// @inheritdoc AbsOutbox
    function _defaultContextAmount() internal pure override returns (uint256) {
        // In ETH-based chains withdrawal amount can be read from msg.value. For that reason
        // amount slot in context will never be accessed and it has 0 default value
        return 0;
    }

    /// @inheritdoc AbsOutbox
    function _amountToSetInContext(uint256) internal pure override returns (uint256) {
        // In ETH-based chains withdrawal amount can be read from msg.value. For that reason
        // amount slot in context will never be accessed, we keep it as 0 all the time
        return 0;
    }
}

// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/nitro/blob/master/LICENSE
// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.4;

import {
    AlreadyInit,
    NotRollup,
    ProofTooLong,
    PathNotMinimal,
    UnknownRoot,
    AlreadySpent,
    BridgeCallFailed,
    HadZeroInit,
    BadPostUpgradeInit,
    RollupNotChanged
} from "../libraries/Error.sol";
import "./IBridge.sol";
import "./IOutbox.sol";
import "../libraries/MerkleLib.sol";
import "../libraries/DelegateCallAware.sol";

/// @dev this error is thrown since certain functions are only expected to be used in simulations, not in actual txs
error SimulationOnlyEntrypoint();

abstract contract AbsOutbox is DelegateCallAware, IOutbox {
    address public rollup; // the rollup contract
    IBridge public bridge; // the bridge contract

    mapping(uint256 => bytes32) public spent; // packed spent bitmap
    mapping(bytes32 => bytes32) public roots; // maps root hashes => L2 block hash

    // we're packing this struct into 4 storage slots
    // 1st slot: timestamp, l2Block (128 bits each, max ~3.4*10^38)
    // 2nd slot: outputId (256 bits)
    // 3rd slot: l1Block (96 bits, max ~7.9*10^28), sender (address 160 bits)
    // 4th slot: withdrawalAmount (256 bits)
    struct L2ToL1Context {
        uint128 l2Block;
        uint128 timestamp;
        bytes32 outputId;
        address sender;
        uint96 l1Block;
        uint256 withdrawalAmount;
    }

    // Note, these variables are set and then wiped during a single transaction.
    // Therefore their values don't need to be maintained, and their slots will
    // hold default values (which are interpreted as empty values) outside of transactions
    L2ToL1Context internal context;

    // default context values to be used in storage instead of zero, to save on storage refunds
    // it is assumed that arb-os never assigns these values to a valid leaf to be redeemed
    uint128 private constant L2BLOCK_DEFAULT_CONTEXT = type(uint128).max;
    uint96 private constant L1BLOCK_DEFAULT_CONTEXT = type(uint96).max;
    uint128 private constant TIMESTAMP_DEFAULT_CONTEXT = type(uint128).max;
    bytes32 private constant OUTPUTID_DEFAULT_CONTEXT = bytes32(type(uint256).max);
    address private constant SENDER_DEFAULT_CONTEXT = address(type(uint160).max);

    uint128 public constant OUTBOX_VERSION = 2;

    function initialize(IBridge _bridge) external onlyDelegated {
        if (address(_bridge) == address(0)) revert HadZeroInit();
        if (address(bridge) != address(0)) revert AlreadyInit();
        // address zero is returned if no context is set, but the values used in storage
        // are non-zero to save users some gas (as storage refunds are usually maxed out)
        // EIP-1153 would help here
        context = L2ToL1Context({
            l2Block: L2BLOCK_DEFAULT_CONTEXT,
            l1Block: L1BLOCK_DEFAULT_CONTEXT,
            timestamp: TIMESTAMP_DEFAULT_CONTEXT,
            outputId: OUTPUTID_DEFAULT_CONTEXT,
            sender: SENDER_DEFAULT_CONTEXT,
            withdrawalAmount: _defaultContextAmount()
        });
        bridge = _bridge;
        rollup = address(_bridge.rollup());
    }

    function postUpgradeInit() external onlyDelegated onlyProxyOwner {
        // prevent postUpgradeInit within a withdrawal
        if (context.l2Block != L2BLOCK_DEFAULT_CONTEXT) revert BadPostUpgradeInit();
        context = L2ToL1Context({
            l2Block: L2BLOCK_DEFAULT_CONTEXT,
            l1Block: L1BLOCK_DEFAULT_CONTEXT,
            timestamp: TIMESTAMP_DEFAULT_CONTEXT,
            outputId: OUTPUTID_DEFAULT_CONTEXT,
            sender: SENDER_DEFAULT_CONTEXT,
            withdrawalAmount: _defaultContextAmount()
        });
    }

    /// @notice Allows the rollup owner to sync the rollup address
    function updateRollupAddress() external {
        if (msg.sender != IOwnable(rollup).owner())
            revert NotOwner(msg.sender, IOwnable(rollup).owner());
        address newRollup = address(bridge.rollup());
        if (rollup == newRollup) revert RollupNotChanged();
        rollup = newRollup;
    }

    function updateSendRoot(bytes32 root, bytes32 l2BlockHash) external {
        if (msg.sender != rollup) revert NotRollup(msg.sender, rollup);
        roots[root] = l2BlockHash;
        emit SendRootUpdated(root, l2BlockHash);
    }

    /// @inheritdoc IOutbox
    function l2ToL1Sender() external view returns (address) {
        address sender = context.sender;
        // we don't return the default context value to avoid a breaking change in the API
        if (sender == SENDER_DEFAULT_CONTEXT) return address(0);
        return sender;
    }

    /// @inheritdoc IOutbox
    function l2ToL1Block() external view returns (uint256) {
        uint128 l2Block = context.l2Block;
        // we don't return the default context value to avoid a breaking change in the API
        if (l2Block == L2BLOCK_DEFAULT_CONTEXT) return uint256(0);
        return uint256(l2Block);
    }

    /// @inheritdoc IOutbox
    function l2ToL1EthBlock() external view returns (uint256) {
        uint96 l1Block = context.l1Block;
        // we don't return the default context value to avoid a breaking change in the API
        if (l1Block == L1BLOCK_DEFAULT_CONTEXT) return uint256(0);
        return uint256(l1Block);
    }

    /// @inheritdoc IOutbox
    function l2ToL1Timestamp() external view returns (uint256) {
        uint128 timestamp = context.timestamp;
        // we don't return the default context value to avoid a breaking change in the API
        if (timestamp == TIMESTAMP_DEFAULT_CONTEXT) return uint256(0);
        return uint256(timestamp);
    }

    /// @notice batch number is deprecated and now always returns 0
    function l2ToL1BatchNum() external pure returns (uint256) {
        return 0;
    }

    /// @inheritdoc IOutbox
    function l2ToL1OutputId() external view returns (bytes32) {
        bytes32 outputId = context.outputId;
        // we don't return the default context value to avoid a breaking change in the API
        if (outputId == OUTPUTID_DEFAULT_CONTEXT) return bytes32(0);
        return outputId;
    }

    /// @inheritdoc IOutbox
    function executeTransaction(
        bytes32[] calldata proof,
        uint256 index,
        address l2Sender,
        address to,
        uint256 l2Block,
        uint256 l1Block,
        uint256 l2Timestamp,
        uint256 value,
        bytes calldata data
    ) external {
        bytes32 userTx = calculateItemHash(
            l2Sender,
            to,
            l2Block,
            l1Block,
            l2Timestamp,
            value,
            data
        );

        recordOutputAsSpent(proof, index, userTx);

        executeTransactionImpl(index, l2Sender, to, l2Block, l1Block, l2Timestamp, value, data);
    }

    /// @inheritdoc IOutbox
    function executeTransactionSimulation(
        uint256 index,
        address l2Sender,
        address to,
        uint256 l2Block,
        uint256 l1Block,
        uint256 l2Timestamp,
        uint256 value,
        bytes calldata data
    ) external {
        if (msg.sender != address(0)) revert SimulationOnlyEntrypoint();
        executeTransactionImpl(index, l2Sender, to, l2Block, l1Block, l2Timestamp, value, data);
    }

    function executeTransactionImpl(
        uint256 outputId,
        address l2Sender,
        address to,
        uint256 l2Block,
        uint256 l1Block,
        uint256 l2Timestamp,
        uint256 value,
        bytes calldata data
    ) internal {
        emit OutBoxTransactionExecuted(to, l2Sender, 0, outputId);

        // we temporarily store the previous values so the outbox can naturally
        // unwind itself when there are nested calls to `executeTransaction`
        L2ToL1Context memory prevContext = context;

        context = L2ToL1Context({
            sender: l2Sender,
            l2Block: uint128(l2Block),
            l1Block: uint96(l1Block),
            timestamp: uint128(l2Timestamp),
            outputId: bytes32(outputId),
            withdrawalAmount: _amountToSetInContext(value)
        });

        // set and reset vars around execution so they remain valid during call
        executeBridgeCall(to, value, data);

        context = prevContext;
    }

    function _calcSpentIndexOffset(uint256 index)
        internal
        view
        returns (
            uint256,
            uint256,
            bytes32
        )
    {
        uint256 spentIndex = index / 255; // Note: Reserves the MSB.
        uint256 bitOffset = index % 255;
        bytes32 replay = spent[spentIndex];
        return (spentIndex, bitOffset, replay);
    }

    function _isSpent(uint256 bitOffset, bytes32 replay) internal pure returns (bool) {
        return ((replay >> bitOffset) & bytes32(uint256(1))) != bytes32(0);
    }

    /// @inheritdoc IOutbox
    function isSpent(uint256 index) external view returns (bool) {
        (, uint256 bitOffset, bytes32 replay) = _calcSpentIndexOffset(index);
        return _isSpent(bitOffset, replay);
    }

    function recordOutputAsSpent(
        bytes32[] memory proof,
        uint256 index,
        bytes32 item
    ) internal {
        if (proof.length >= 256) revert ProofTooLong(proof.length);
        if (index >= 2**proof.length) revert PathNotMinimal(index, 2**proof.length);

        // Hash the leaf an extra time to prove it's a leaf
        bytes32 calcRoot = calculateMerkleRoot(proof, index, item);
        if (roots[calcRoot] == bytes32(0)) revert UnknownRoot(calcRoot);

        (uint256 spentIndex, uint256 bitOffset, bytes32 replay) = _calcSpentIndexOffset(index);

        if (_isSpent(bitOffset, replay)) revert AlreadySpent(index);
        spent[spentIndex] = (replay | bytes32(1 << bitOffset));
    }

    function executeBridgeCall(
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        (bool success, bytes memory returndata) = bridge.executeCall(to, value, data);
        if (!success) {
            if (returndata.length > 0) {
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert BridgeCallFailed();
            }
        }
    }

    function calculateItemHash(
        address l2Sender,
        address to,
        uint256 l2Block,
        uint256 l1Block,
        uint256 l2Timestamp,
        uint256 value,
        bytes calldata data
    ) public pure returns (bytes32) {
        return
            keccak256(abi.encodePacked(l2Sender, to, l2Block, l1Block, l2Timestamp, value, data));
    }

    function calculateMerkleRoot(
        bytes32[] memory proof,
        uint256 path,
        bytes32 item
    ) public pure returns (bytes32) {
        return MerkleLib.calculateRoot(proof, path, keccak256(abi.encodePacked(item)));
    }

    /// @notice default value to be used for 'amount' field in L2ToL1Context outside of transaction execution.
    /// @return default 'amount' in case of ERC20-based rollup is type(uint256).max, or 0 in case of ETH-based rollup
    function _defaultContextAmount() internal pure virtual returns (uint256);

    /// @notice value to be set for 'amount' field in L2ToL1Context during L2 to L1 transaction execution.
    ///         In case of ERC20-based rollup this is the amount of native token being withdrawn. In case of standard ETH-based
    ///         rollup this amount shall always be 0, because amount of ETH being withdrawn can be read from msg.value.
    /// @return amount of native token being withdrawn in case of ERC20-based rollup, or 0 in case of ETH-based rollup
    function _amountToSetInContext(uint256 value) internal pure virtual returns (uint256);

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[42] private __gap;
}

// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

// solhint-disable-next-line compiler-version
pragma solidity >=0.6.9 <0.9.0;

import "./IOwnable.sol";

interface IBridge {
    event MessageDelivered(
        uint256 indexed messageIndex,
        bytes32 indexed beforeInboxAcc,
        address inbox,
        uint8 kind,
        address sender,
        bytes32 messageDataHash,
        uint256 baseFeeL1,
        uint64 timestamp
    );

    event BridgeCallTriggered(
        address indexed outbox,
        address indexed to,
        uint256 value,
        bytes data
    );

    event InboxToggle(address indexed inbox, bool enabled);

    event OutboxToggle(address indexed outbox, bool enabled);

    event SequencerInboxUpdated(address newSequencerInbox);

    event RollupUpdated(address rollup);

    function allowedDelayedInboxList(uint256) external returns (address);

    function allowedOutboxList(uint256) external returns (address);

    /// @dev Accumulator for delayed inbox messages; tail represents hash of the current state; each element represents the inclusion of a new message.
    function delayedInboxAccs(uint256) external view returns (bytes32);

    /// @dev Accumulator for sequencer inbox messages; tail represents hash of the current state; each element represents the inclusion of a new message.
    function sequencerInboxAccs(uint256) external view returns (bytes32);

    function rollup() external view returns (IOwnable);

    function sequencerInbox() external view returns (address);

    function activeOutbox() external view returns (address);

    function allowedDelayedInboxes(address inbox) external view returns (bool);

    function allowedOutboxes(address outbox) external view returns (bool);

    function sequencerReportedSubMessageCount() external view returns (uint256);

    function executeCall(
        address to,
        uint256 value,
        bytes calldata data
    ) external returns (bool success, bytes memory returnData);

    function delayedMessageCount() external view returns (uint256);

    function sequencerMessageCount() external view returns (uint256);

    // ---------- onlySequencerInbox functions ----------

    function enqueueSequencerMessage(
        bytes32 dataHash,
        uint256 afterDelayedMessagesRead,
        uint256 prevMessageCount,
        uint256 newMessageCount
    )
        external
        returns (
            uint256 seqMessageIndex,
            bytes32 beforeAcc,
            bytes32 delayedAcc,
            bytes32 acc
        );

    /**
     * @dev Allows the sequencer inbox to submit a delayed message of the batchPostingReport type
     *      This is done through a separate function entrypoint instead of allowing the sequencer inbox
     *      to call `enqueueDelayedMessage` to avoid the gas overhead of an extra SLOAD in either
     *      every delayed inbox or every sequencer inbox call.
     */
    function submitBatchSpendingReport(address batchPoster, bytes32 dataHash)
        external
        returns (uint256 msgNum);

    // ---------- onlyRollupOrOwner functions ----------

    function setSequencerInbox(address _sequencerInbox) external;

    function setDelayedInbox(address inbox, bool enabled) external;

    function setOutbox(address inbox, bool enabled) external;

    function updateRollupAddress(IOwnable _rollup) external;
}

// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

// solhint-disable-next-line compiler-version
pragma solidity >=0.6.9 <0.9.0;

import "./IBridge.sol";

interface IOutbox {
    event SendRootUpdated(bytes32 indexed outputRoot, bytes32 indexed l2BlockHash);
    event OutBoxTransactionExecuted(
        address indexed to,
        address indexed l2Sender,
        uint256 indexed zero,
        uint256 transactionIndex
    );

    function initialize(IBridge _bridge) external;

    function rollup() external view returns (address); // the rollup contract

    function bridge() external view returns (IBridge); // the bridge contract

    function spent(uint256) external view returns (bytes32); // packed spent bitmap

    function roots(bytes32) external view returns (bytes32); // maps root hashes => L2 block hash

    // solhint-disable-next-line func-name-mixedcase
    function OUTBOX_VERSION() external view returns (uint128); // the outbox version

    function updateSendRoot(bytes32 sendRoot, bytes32 l2BlockHash) external;

    function updateRollupAddress() external;

    /// @notice When l2ToL1Sender returns a nonzero address, the message was originated by an L2 account
    ///         When the return value is zero, that means this is a system message
    /// @dev the l2ToL1Sender behaves as the tx.origin, the msg.sender should be validated to protect against reentrancies
    function l2ToL1Sender() external view returns (address);

    /// @return l2Block return L2 block when the L2 tx was initiated or 0 if no L2 to L1 transaction is active
    function l2ToL1Block() external view returns (uint256);

    /// @return l1Block return L1 block when the L2 tx was initiated or 0 if no L2 to L1 transaction is active
    function l2ToL1EthBlock() external view returns (uint256);

    /// @return timestamp return L2 timestamp when the L2 tx was initiated or 0 if no L2 to L1 transaction is active
    function l2ToL1Timestamp() external view returns (uint256);

    /// @return outputId returns the unique output identifier of the L2 to L1 tx or 0 if no L2 to L1 transaction is active
    function l2ToL1OutputId() external view returns (bytes32);

    /**
     * @notice Executes a messages in an Outbox entry.
     * @dev Reverts if dispute period hasn't expired, since the outbox entry
     *      is only created once the rollup confirms the respective assertion.
     * @dev it is not possible to execute any L2-to-L1 transaction which contains data
     *      to a contract address without any code (as enforced by the Bridge contract).
     * @param proof Merkle proof of message inclusion in send root
     * @param index Merkle path to message
     * @param l2Sender sender if original message (i.e., caller of ArbSys.sendTxToL1)
     * @param to destination address for L1 contract call
     * @param l2Block l2 block number at which sendTxToL1 call was made
     * @param l1Block l1 block number at which sendTxToL1 call was made
     * @param l2Timestamp l2 Timestamp at which sendTxToL1 call was made
     * @param value wei in L1 message
     * @param data abi-encoded L1 message data
     */
    function executeTransaction(
        bytes32[] calldata proof,
        uint256 index,
        address l2Sender,
        address to,
        uint256 l2Block,
        uint256 l1Block,
        uint256 l2Timestamp,
        uint256 value,
        bytes calldata data
    ) external;

    /**
     *  @dev function used to simulate the result of a particular function call from the outbox
     *       it is useful for things such as gas estimates. This function includes all costs except for
     *       proof validation (which can be considered offchain as a somewhat of a fixed cost - it's
     *       not really a fixed cost, but can be treated as so with a fixed overhead for gas estimation).
     *       We can't include the cost of proof validation since this is intended to be used to simulate txs
     *       that are included in yet-to-be confirmed merkle roots. The simulation entrypoint could instead pretend
     *       to confirm a pending merkle root, but that would be less practical for integrating with tooling.
     *       It is only possible to trigger it when the msg sender is address zero, which should be impossible
     *       unless under simulation in an eth_call or eth_estimateGas
     */
    function executeTransactionSimulation(
        uint256 index,
        address l2Sender,
        address to,
        uint256 l2Block,
        uint256 l1Block,
        uint256 l2Timestamp,
        uint256 value,
        bytes calldata data
    ) external;

    /**
     * @param index Merkle path to message
     * @return true if the message has been spent
     */
    function isSpent(uint256 index) external view returns (bool);

    function calculateItemHash(
        address l2Sender,
        address to,
        uint256 l2Block,
        uint256 l1Block,
        uint256 l2Timestamp,
        uint256 value,
        bytes calldata data
    ) external pure returns (bytes32);

    function calculateMerkleRoot(
        bytes32[] memory proof,
        uint256 path,
        bytes32 item
    ) external pure returns (bytes32);

    /**
     * @dev function to be called one time during the outbox upgrade process
     *      this is used to fix the storage slots
     */
    function postUpgradeInit() external;
}

// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.21 <0.9.0;

interface IOwnable {
    function owner() external view returns (address);
}

// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.0;

import {NotOwner} from "./Error.sol";

/// @dev A stateless contract that allows you to infer if the current call has been delegated or not
/// Pattern used here is from UUPS implementation by the OpenZeppelin team
abstract contract DelegateCallAware {
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegate call. This allows a function to be
     * callable on the proxy contract but not on the logic contract.
     */
    modifier onlyDelegated() {
        require(address(this) != __self, "Function must be called through delegatecall");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "Function must not be called through delegatecall");
        _;
    }

    /// @dev Check that msg.sender is the current EIP 1967 proxy admin
    modifier onlyProxyOwner() {
        // Storage slot with the admin of the proxy contract
        // This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1
        bytes32 slot = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
        address admin;
        assembly {
            admin := sload(slot)
        }
        if (msg.sender != admin) revert NotOwner(msg.sender, admin);
        _;
    }
}

// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.4;

/// @dev Init was already called
error AlreadyInit();

/// @dev Init was called with param set to zero that must be nonzero
error HadZeroInit();

/// @dev Thrown when post upgrade init validation fails
error BadPostUpgradeInit();

/// @dev Thrown when non owner tries to access an only-owner function
/// @param sender The msg.sender who is not the owner
/// @param owner The owner address
error NotOwner(address sender, address owner);

/// @dev Thrown when an address that is not the rollup tries to call an only-rollup function
/// @param sender The sender who is not the rollup
/// @param rollup The rollup address authorized to call this function
error NotRollup(address sender, address rollup);

/// @dev Thrown when the contract was not called directly from the origin ie msg.sender != tx.origin
error NotOrigin();

/// @dev Provided data was too large
/// @param dataLength The length of the data that is too large
/// @param maxDataLength The max length the data can be
error DataTooLarge(uint256 dataLength, uint256 maxDataLength);

/// @dev The provided is not a contract and was expected to be
/// @param addr The adddress in question
error NotContract(address addr);

/// @dev The merkle proof provided was too long
/// @param actualLength The length of the merkle proof provided
/// @param maxProofLength The max length a merkle proof can have
error MerkleProofTooLong(uint256 actualLength, uint256 maxProofLength);

/// @dev Thrown when an un-authorized address tries to access an admin function
/// @param sender The un-authorized sender
/// @param rollup The rollup, which would be authorized
/// @param owner The rollup's owner, which would be authorized
error NotRollupOrOwner(address sender, address rollup, address owner);

// Bridge Errors

/// @dev Thrown when an un-authorized address tries to access an only-inbox function
/// @param sender The un-authorized sender
error NotDelayedInbox(address sender);

/// @dev Thrown when an un-authorized address tries to access an only-sequencer-inbox function
/// @param sender The un-authorized sender
error NotSequencerInbox(address sender);

/// @dev Thrown when an un-authorized address tries to access an only-outbox function
/// @param sender The un-authorized sender
error NotOutbox(address sender);

/// @dev the provided outbox address isn't valid
/// @param outbox address of outbox being set
error InvalidOutboxSet(address outbox);

/// @dev The provided token address isn't valid
/// @param token address of token being set
error InvalidTokenSet(address token);

/// @dev Call to this specific address is not allowed
/// @param target address of the call receiver
error CallTargetNotAllowed(address target);

/// @dev Call that changes the balance of ERC20Bridge is not allowed
error CallNotAllowed();

// Inbox Errors

/// @dev The contract is paused, so cannot be paused
error AlreadyPaused();

/// @dev The contract is unpaused, so cannot be unpaused
error AlreadyUnpaused();

/// @dev The contract is paused
error Paused();

/// @dev msg.value sent to the inbox isn't high enough
error InsufficientValue(uint256 expected, uint256 actual);

/// @dev submission cost provided isn't enough to create retryable ticket
error InsufficientSubmissionCost(uint256 expected, uint256 actual);

/// @dev address not allowed to interact with the given contract
error NotAllowedOrigin(address origin);

/// @dev used to convey retryable tx data in eth calls without requiring a tx trace
/// this follows a pattern similar to EIP-3668 where reverts surface call information
error RetryableData(
    address from,
    address to,
    uint256 l2CallValue,
    uint256 deposit,
    uint256 maxSubmissionCost,
    address excessFeeRefundAddress,
    address callValueRefundAddress,
    uint256 gasLimit,
    uint256 maxFeePerGas,
    bytes data
);

/// @dev Thrown when a L1 chainId fork is detected
error L1Forked();

/// @dev Thrown when a L1 chainId fork is not detected
error NotForked();

/// @dev The provided gasLimit is larger than uint64
error GasLimitTooLarge();

// Outbox Errors

/// @dev The provided proof was too long
/// @param proofLength The length of the too-long proof
error ProofTooLong(uint256 proofLength);

/// @dev The output index was greater than the maximum
/// @param index The output index
/// @param maxIndex The max the index could be
error PathNotMinimal(uint256 index, uint256 maxIndex);

/// @dev The calculated root does not exist
/// @param root The calculated root
error UnknownRoot(bytes32 root);

/// @dev The record has already been spent
/// @param index The index of the spent record
error AlreadySpent(uint256 index);

/// @dev A call to the bridge failed with no return data
error BridgeCallFailed();

// Sequencer Inbox Errors

/// @dev Thrown when someone attempts to read fewer messages than have already been read
error DelayedBackwards();

/// @dev Thrown when someone attempts to read more messages than exist
error DelayedTooFar();

/// @dev Force include can only read messages more blocks old than the delay period
error ForceIncludeBlockTooSoon();

/// @dev Force include can only read messages more seconds old than the delay period
error ForceIncludeTimeTooSoon();

/// @dev The message provided did not match the hash in the delayed inbox
error IncorrectMessagePreimage();

/// @dev This can only be called by the batch poster
error NotBatchPoster();

/// @dev The sequence number provided to this message was inconsistent with the number of batches already included
error BadSequencerNumber(uint256 stored, uint256 received);

/// @dev The sequence message number provided to this message was inconsistent with the previous one
error BadSequencerMessageNumber(uint256 stored, uint256 received);

/// @dev The batch data has the inbox authenticated bit set, but the batch data was not authenticated by the inbox
error DataNotAuthenticated();

/// @dev Tried to create an already valid Data Availability Service keyset
error AlreadyValidDASKeyset(bytes32);

/// @dev Tried to use or invalidate an already invalid Data Availability Service keyset
error NoSuchKeyset(bytes32);

/// @dev Thrown when rollup is not updated with updateRollupAddress
error RollupNotChanged();

// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.4;

import {MerkleProofTooLong} from "./Error.sol";

library MerkleLib {
    function generateRoot(bytes32[] memory _hashes) internal pure returns (bytes32) {
        bytes32[] memory prevLayer = _hashes;
        while (prevLayer.length > 1) {
            bytes32[] memory nextLayer = new bytes32[]((prevLayer.length + 1) / 2);
            for (uint256 i = 0; i < nextLayer.length; i++) {
                if (2 * i + 1 < prevLayer.length) {
                    nextLayer[i] = keccak256(
                        abi.encodePacked(prevLayer[2 * i], prevLayer[2 * i + 1])
                    );
                } else {
                    nextLayer[i] = prevLayer[2 * i];
                }
            }
            prevLayer = nextLayer;
        }
        return prevLayer[0];
    }

    function calculateRoot(
        bytes32[] memory nodes,
        uint256 route,
        bytes32 item
    ) internal pure returns (bytes32) {
        uint256 proofItems = nodes.length;
        if (proofItems > 256) revert MerkleProofTooLong(proofItems, 256);
        bytes32 h = item;
        for (uint256 i = 0; i < proofItems; ) {
            bytes32 node = nodes[i];
            if ((route & (1 << i)) == 0) {
                assembly {
                    mstore(0x00, h)
                    mstore(0x20, node)
                    h := keccak256(0x00, 0x40)
                }
            } else {
                assembly {
                    mstore(0x00, node)
                    mstore(0x20, h)
                    h := keccak256(0x00, 0x40)
                }
            }
            unchecked {
                ++i;
            }
        }
        return h;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"name":"AlreadyInit","type":"error"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"AlreadySpent","type":"error"},{"inputs":[],"name":"BadPostUpgradeInit","type":"error"},{"inputs":[],"name":"BridgeCallFailed","type":"error"},{"inputs":[],"name":"HadZeroInit","type":"error"},{"inputs":[{"internalType":"uint256","name":"actualLength","type":"uint256"},{"internalType":"uint256","name":"maxProofLength","type":"uint256"}],"name":"MerkleProofTooLong","type":"error"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"owner","type":"address"}],"name":"NotOwner","type":"error"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"rollup","type":"address"}],"name":"NotRollup","type":"error"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"maxIndex","type":"uint256"}],"name":"PathNotMinimal","type":"error"},{"inputs":[{"internalType":"uint256","name":"proofLength","type":"uint256"}],"name":"ProofTooLong","type":"error"},{"inputs":[],"name":"RollupNotChanged","type":"error"},{"inputs":[],"name":"SimulationOnlyEntrypoint","type":"error"},{"inputs":[{"internalType":"bytes32","name":"root","type":"bytes32"}],"name":"UnknownRoot","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"address","name":"l2Sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"zero","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"transactionIndex","type":"uint256"}],"name":"OutBoxTransactionExecuted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"outputRoot","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"l2BlockHash","type":"bytes32"}],"name":"SendRootUpdated","type":"event"},{"inputs":[],"name":"OUTBOX_VERSION","outputs":[{"internalType":"uint128","name":"","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"bridge","outputs":[{"internalType":"contract IBridge","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"l2Sender","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"l2Block","type":"uint256"},{"internalType":"uint256","name":"l1Block","type":"uint256"},{"internalType":"uint256","name":"l2Timestamp","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"calculateItemHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"proof","type":"bytes32[]"},{"internalType":"uint256","name":"path","type":"uint256"},{"internalType":"bytes32","name":"item","type":"bytes32"}],"name":"calculateMerkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"proof","type":"bytes32[]"},{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"address","name":"l2Sender","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"l2Block","type":"uint256"},{"internalType":"uint256","name":"l1Block","type":"uint256"},{"internalType":"uint256","name":"l2Timestamp","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"executeTransaction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"address","name":"l2Sender","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"l2Block","type":"uint256"},{"internalType":"uint256","name":"l1Block","type":"uint256"},{"internalType":"uint256","name":"l2Timestamp","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"executeTransactionSimulation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IBridge","name":"_bridge","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"isSpent","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2ToL1BatchNum","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"l2ToL1Block","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2ToL1EthBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2ToL1OutputId","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2ToL1Sender","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2ToL1Timestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"postUpgradeInit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rollup","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"roots","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"spent","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"updateRollupAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"root","type":"bytes32"},{"internalType":"bytes32","name":"l2BlockHash","type":"bytes32"}],"name":"updateSendRoot","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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