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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "solady/utils/ECDSA.sol";
import "src/utils/KernelHelper.sol";
import "src/interfaces/IValidator.sol";
import "src/common/Types.sol";

struct ECDSAValidatorStorage {
    address owner;
}

contract ECDSAValidator is IKernelValidator {
    event OwnerChanged(address indexed kernel, address indexed oldOwner, address indexed newOwner);

    mapping(address => ECDSAValidatorStorage) public ecdsaValidatorStorage;

    function disable(bytes calldata) external payable override {
        delete ecdsaValidatorStorage[msg.sender];
    }

    function enable(bytes calldata _data) external payable override {
        address owner = address(bytes20(_data[0:20]));
        address oldOwner = ecdsaValidatorStorage[msg.sender].owner;
        ecdsaValidatorStorage[msg.sender].owner = owner;
        emit OwnerChanged(msg.sender, oldOwner, owner);
    }

    function validateUserOp(UserOperation calldata _userOp, bytes32 _userOpHash, uint256)
        external
        payable
        override
        returns (ValidationData validationData)
    {
        address owner = ecdsaValidatorStorage[_userOp.sender].owner;
        bytes32 hash = ECDSA.toEthSignedMessageHash(_userOpHash);
        if (owner == ECDSA.recover(hash, _userOp.signature)) {
            return ValidationData.wrap(0);
        }
        if (owner != ECDSA.recover(_userOpHash, _userOp.signature)) {
            return SIG_VALIDATION_FAILED;
        }
    }

    function validateSignature(bytes32 hash, bytes calldata signature) public view override returns (ValidationData) {
        address owner = ecdsaValidatorStorage[msg.sender].owner;
        if (owner == ECDSA.recover(hash, signature)) {
            return ValidationData.wrap(0);
        }
        bytes32 ethHash = ECDSA.toEthSignedMessageHash(hash);
        address recovered = ECDSA.recover(ethHash, signature);
        if (owner != recovered) {
            return SIG_VALIDATION_FAILED;
        }
        return ValidationData.wrap(0);
    }

    function validCaller(address _caller, bytes calldata) external view override returns (bool) {
        return ecdsaValidatorStorage[msg.sender].owner == _caller;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice Gas optimized ECDSA wrapper.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/ECDSA.sol)
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/ECDSA.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/ECDSA.sol)
library ECDSA {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                        CUSTOM ERRORS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The signature is invalid.
    error InvalidSignature();

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         CONSTANTS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The number which `s` must not exceed in order for
    /// the signature to be non-malleable.
    bytes32 private constant _MALLEABILITY_THRESHOLD =
        0x7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                    RECOVERY OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // Note: as of Solady version 0.0.68, these functions will
    // revert upon recovery failure for more safety by default.

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function recover(bytes32 hash, bytes memory signature) internal view returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            // Copy `r` and `s`.
            mstore(0x40, mload(add(signature, 0x20))) // `r`.
            let s := mload(add(signature, 0x40))
            mstore(0x60, s)
            // Store the `hash` in the scratch space.
            mstore(0x00, hash)
            // Compute `v` and store it in the scratch space.
            mstore(0x20, byte(0, mload(add(signature, 0x60))))
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    and(
                        // If the signature is exactly 65 bytes in length.
                        eq(mload(signature), 65),
                        // If `s` in lower half order, such that the signature is not malleable.
                        lt(s, add(_MALLEABILITY_THRESHOLD, 1))
                    ), // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x00, // Start of output.
                    0x20 // Size of output.
                )
            )
            result := mload(0x00)
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                // Store the function selector of `InvalidSignature()`.
                mstore(0x00, 0x8baa579f)
                // Revert with (offset, size).
                revert(0x1c, 0x04)
            }
            // Restore the zero slot.
            mstore(0x60, 0)
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function recoverCalldata(bytes32 hash, bytes calldata signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            // Directly copy `r` and `s` from the calldata.
            calldatacopy(0x40, signature.offset, 0x40)
            // Store the `hash` in the scratch space.
            mstore(0x00, hash)
            // Compute `v` and store it in the scratch space.
            mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40))))
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    and(
                        // If the signature is exactly 65 bytes in length.
                        eq(signature.length, 65),
                        // If `s` in lower half order, such that the signature is not malleable.
                        lt(mload(0x60), add(_MALLEABILITY_THRESHOLD, 1))
                    ), // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x00, // Start of output.
                    0x20 // Size of output.
                )
            )
            result := mload(0x00)
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                // Store the function selector of `InvalidSignature()`.
                mstore(0x00, 0x8baa579f)
                // Revert with (offset, size).
                revert(0x1c, 0x04)
            }
            // Restore the zero slot.
            mstore(0x60, 0)
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the EIP-2098 short form signature defined by `r` and `vs`.
    ///
    /// This function only accepts EIP-2098 short form signatures.
    /// See: https://eips.ethereum.org/EIPS/eip-2098
    ///
    /// To be honest, I do not recommend using EIP-2098 signatures
    /// for simplicity, performance, and security reasons. Most if not
    /// all clients support traditional non EIP-2098 signatures by default.
    /// As such, this method is intentionally not fully inlined.
    /// It is merely included for completeness.
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal view returns (address result) {
        uint8 v;
        bytes32 s;
        /// @solidity memory-safe-assembly
        assembly {
            s := shr(1, shl(1, vs))
            v := add(shr(255, vs), 27)
        }
        result = recover(hash, v, r, s);
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the signature defined by `v`, `r`, `s`.
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            mstore(0x00, hash)
            mstore(0x20, and(v, 0xff))
            mstore(0x40, r)
            mstore(0x60, s)
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    // If `s` in lower half order, such that the signature is not malleable.
                    lt(s, add(_MALLEABILITY_THRESHOLD, 1)), // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x00, // Start of output.
                    0x20 // Size of output.
                )
            )
            result := mload(0x00)
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                // Store the function selector of `InvalidSignature()`.
                mstore(0x00, 0x8baa579f)
                // Revert with (offset, size).
                revert(0x1c, 0x04)
            }
            // Restore the zero slot.
            mstore(0x60, 0)
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   TRY-RECOVER OPERATIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // WARNING!
    // These functions will NOT revert upon recovery failure.
    // Instead, they will return the zero address upon recovery failure.
    // It is critical that the returned address is NEVER compared against
    // a zero address (e.g. an uninitialized address variable).

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function tryRecover(bytes32 hash, bytes memory signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(xor(mload(signature), 65)) {
                // Copy the free memory pointer so that we can restore it later.
                let m := mload(0x40)
                // Copy `r` and `s`.
                mstore(0x40, mload(add(signature, 0x20))) // `r`.
                let s := mload(add(signature, 0x40))
                mstore(0x60, s)
                // If `s` in lower half order, such that the signature is not malleable.
                if iszero(gt(s, _MALLEABILITY_THRESHOLD)) {
                    // Store the `hash` in the scratch space.
                    mstore(0x00, hash)
                    // Compute `v` and store it in the scratch space.
                    mstore(0x20, byte(0, mload(add(signature, 0x60))))
                    pop(
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            0x01, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x40, // Start of output.
                            0x20 // Size of output.
                        )
                    )
                    // Restore the zero slot.
                    mstore(0x60, 0)
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    result := mload(xor(0x60, returndatasize()))
                }
                // Restore the free memory pointer.
                mstore(0x40, m)
            }
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function tryRecoverCalldata(bytes32 hash, bytes calldata signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(xor(signature.length, 65)) {
                // Copy the free memory pointer so that we can restore it later.
                let m := mload(0x40)
                // Directly copy `r` and `s` from the calldata.
                calldatacopy(0x40, signature.offset, 0x40)
                // If `s` in lower half order, such that the signature is not malleable.
                if iszero(gt(mload(0x60), _MALLEABILITY_THRESHOLD)) {
                    // Store the `hash` in the scratch space.
                    mstore(0x00, hash)
                    // Compute `v` and store it in the scratch space.
                    mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40))))
                    pop(
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            0x01, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x40, // Start of output.
                            0x20 // Size of output.
                        )
                    )
                    // Restore the zero slot.
                    mstore(0x60, 0)
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    result := mload(xor(0x60, returndatasize()))
                }
                // Restore the free memory pointer.
                mstore(0x40, m)
            }
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the EIP-2098 short form signature defined by `r` and `vs`.
    ///
    /// This function only accepts EIP-2098 short form signatures.
    /// See: https://eips.ethereum.org/EIPS/eip-2098
    ///
    /// To be honest, I do not recommend using EIP-2098 signatures
    /// for simplicity, performance, and security reasons. Most if not
    /// all clients support traditional non EIP-2098 signatures by default.
    /// As such, this method is intentionally not fully inlined.
    /// It is merely included for completeness.
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs)
        internal
        view
        returns (address result)
    {
        uint8 v;
        bytes32 s;
        /// @solidity memory-safe-assembly
        assembly {
            s := shr(1, shl(1, vs))
            v := add(shr(255, vs), 27)
        }
        result = tryRecover(hash, v, r, s);
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the signature defined by `v`, `r`, `s`.
    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            // If `s` in lower half order, such that the signature is not malleable.
            if iszero(gt(s, _MALLEABILITY_THRESHOLD)) {
                // Store the `hash`, `v`, `r`, `s` in the scratch space.
                mstore(0x00, hash)
                mstore(0x20, and(v, 0xff))
                mstore(0x40, r)
                mstore(0x60, s)
                pop(
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        0x01, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x40, // Start of output.
                        0x20 // Size of output.
                    )
                )
                // Restore the zero slot.
                mstore(0x60, 0)
                // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                result := mload(xor(0x60, returndatasize()))
            }
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     HASHING OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns an Ethereum Signed Message, created from a `hash`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            // Store into scratch space for keccak256.
            mstore(0x20, hash)
            mstore(0x00, "\x00\x00\x00\x00\x19Ethereum Signed Message:\n32")
            // 0x40 - 0x04 = 0x3c
            result := keccak256(0x04, 0x3c)
        }
    }

    /// @dev Returns an Ethereum Signed Message, created from `s`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32 result) {
        assembly {
            // The length of "\x19Ethereum Signed Message:\n" is 26 bytes (i.e. 0x1a).
            // If we reserve 2 words, we'll have 64 - 26 = 38 bytes to store the
            // ASCII decimal representation of the length of `s` up to about 2 ** 126.

            // Instead of allocating, we temporarily copy the 64 bytes before the
            // start of `s` data to some variables.
            let m := mload(sub(s, 0x20))
            // The length of `s` is in bytes.
            let sLength := mload(s)
            let ptr := add(s, 0x20)
            let w := not(0)
            // `end` marks the end of the memory which we will compute the keccak256 of.
            let end := add(ptr, sLength)
            // Convert the length of the bytes to ASCII decimal representation
            // and store it into the memory.
            for { let temp := sLength } 1 {} {
                ptr := add(ptr, w) // `sub(ptr, 1)`.
                mstore8(ptr, add(48, mod(temp, 10)))
                temp := div(temp, 10)
                if iszero(temp) { break }
            }
            // Copy the header over to the memory.
            mstore(sub(ptr, 0x20), "\x00\x00\x00\x00\x00\x00\x19Ethereum Signed Message:\n")
            // Compute the keccak256 of the memory.
            result := keccak256(sub(ptr, 0x1a), sub(end, sub(ptr, 0x1a)))
            // Restore the previous memory.
            mstore(s, sLength)
            mstore(sub(s, 0x20), m)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   EMPTY CALLDATA HELPERS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns an empty calldata bytes.
    function emptySignature() internal pure returns (bytes calldata signature) {
        /// @solidity memory-safe-assembly
        assembly {
            signature.length := 0
        }
    }
}

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

import {SIG_VALIDATION_FAILED_UINT} from "src/common/Constants.sol";
import {ValidationData} from "src/common/Types.sol";

function _intersectValidationData(ValidationData a, ValidationData b) pure returns (ValidationData validationData) {
    assembly {
        // xor(a,b) == shows only matching bits
        // and(xor(a,b), 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff) == filters out the validAfter and validUntil bits
        // if the result is not zero, then aggregator part is not matching
        switch iszero(and(xor(a, b), 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff))
        case 1 {
            // validAfter
            let a_vd := and(0xffffffffffff000000000000ffffffffffffffffffffffffffffffffffffffff, a)
            let b_vd := and(0xffffffffffff000000000000ffffffffffffffffffffffffffffffffffffffff, b)
            validationData := xor(a_vd, mul(xor(a_vd, b_vd), gt(b_vd, a_vd)))
            // validUntil
            a_vd := and(0x000000000000ffffffffffff0000000000000000000000000000000000000000, a)
            b_vd := and(0x000000000000ffffffffffff0000000000000000000000000000000000000000, b)
            let until := xor(a_vd, mul(xor(a_vd, b_vd), lt(b_vd, a_vd)))
            if iszero(until) { until := 0x000000000000ffffffffffff0000000000000000000000000000000000000000 }
            validationData := or(validationData, until)
        }
        default { validationData := SIG_VALIDATION_FAILED_UINT }
    }
}

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

import {UserOperation} from "account-abstraction/interfaces/UserOperation.sol";
import "src/common/Types.sol";

interface IKernelValidator {
    function enable(bytes calldata _data) external payable;

    function disable(bytes calldata _data) external payable;

    function validateUserOp(UserOperation calldata userOp, bytes32 userOpHash, uint256 missingFunds)
        external
        payable
        returns (ValidationData);

    function validateSignature(bytes32 hash, bytes calldata signature) external view returns (ValidationData);

    function validCaller(address caller, bytes calldata data) external view returns (bool);
}

// 3 modes
// 1. default mode, use preset validator for the kernel
// 2. enable mode, enable a new validator for given action and use it for current userOp
// 3. sudo mode, use default plugin for current userOp

pragma solidity ^0.8.9;

import "src/common/Constants.sol";

type ValidAfter is uint48;

type ValidUntil is uint48;

type ValidationData is uint256;

ValidationData constant SIG_VALIDATION_FAILED = ValidationData.wrap(SIG_VALIDATION_FAILED_UINT);

function packValidationData(ValidAfter validAfter, ValidUntil validUntil) pure returns (ValidationData) {
    return ValidationData.wrap(
        uint256(ValidAfter.unwrap(validAfter)) << 208 | uint256(ValidUntil.unwrap(validUntil)) << 160
    );
}

function parseValidationData(ValidationData validationData)
    pure
    returns (ValidAfter validAfter, ValidUntil validUntil, address result)
{
    assembly {
        result := validationData
        validUntil := and(shr(160, validationData), 0xffffffffffff)
        switch iszero(validUntil)
        case 1 { validUntil := 0xffffffffffff }
        validAfter := shr(208, validationData)
    }
}

pragma solidity ^0.8.0;

// constants for kernel metadata
string constant KERNEL_NAME = "Kernel";
string constant KERNEL_VERSION = "0.2.1";

// ERC4337 constants
uint256 constant SIG_VALIDATION_FAILED_UINT = 1;

// STRUCT_HASH
bytes32 constant VALIDATOR_APPROVED_STRUCT_HASH = 0x3ce406685c1b3551d706d85a68afdaa49ac4e07b451ad9b8ff8b58c3ee964176;

// Storage slots
bytes32 constant KERNEL_STORAGE_SLOT = 0x439ffe7df606b78489639bc0b827913bd09e1246fa6802968a5b3694c53e0dd8;
bytes32 constant KERNEL_STORAGE_SLOT_1 = 0x439ffe7df606b78489639bc0b827913bd09e1246fa6802968a5b3694c53e0dd9;
bytes32 constant IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

/* solhint-disable no-inline-assembly */

import {calldataKeccak} from "../core/Helpers.sol";

/**
 * User Operation struct
 * @param sender the sender account of this request.
     * @param nonce unique value the sender uses to verify it is not a replay.
     * @param initCode if set, the account contract will be created by this constructor/
     * @param callData the method call to execute on this account.
     * @param callGasLimit the gas limit passed to the callData method call.
     * @param verificationGasLimit gas used for validateUserOp and validatePaymasterUserOp.
     * @param preVerificationGas gas not calculated by the handleOps method, but added to the gas paid. Covers batch overhead.
     * @param maxFeePerGas same as EIP-1559 gas parameter.
     * @param maxPriorityFeePerGas same as EIP-1559 gas parameter.
     * @param paymasterAndData if set, this field holds the paymaster address and paymaster-specific data. the paymaster will pay for the transaction instead of the sender.
     * @param signature sender-verified signature over the entire request, the EntryPoint address and the chain ID.
     */
    struct UserOperation {

        address sender;
        uint256 nonce;
        bytes initCode;
        bytes callData;
        uint256 callGasLimit;
        uint256 verificationGasLimit;
        uint256 preVerificationGas;
        uint256 maxFeePerGas;
        uint256 maxPriorityFeePerGas;
        bytes paymasterAndData;
        bytes signature;
    }

/**
 * Utility functions helpful when working with UserOperation structs.
 */
library UserOperationLib {

    function getSender(UserOperation calldata userOp) internal pure returns (address) {
        address data;
        //read sender from userOp, which is first userOp member (saves 800 gas...)
        assembly {data := calldataload(userOp)}
        return address(uint160(data));
    }

    //relayer/block builder might submit the TX with higher priorityFee, but the user should not
    // pay above what he signed for.
    function gasPrice(UserOperation calldata userOp) internal view returns (uint256) {
    unchecked {
        uint256 maxFeePerGas = userOp.maxFeePerGas;
        uint256 maxPriorityFeePerGas = userOp.maxPriorityFeePerGas;
        if (maxFeePerGas == maxPriorityFeePerGas) {
            //legacy mode (for networks that don't support basefee opcode)
            return maxFeePerGas;
        }
        return min(maxFeePerGas, maxPriorityFeePerGas + block.basefee);
    }
    }

    function pack(UserOperation calldata userOp) internal pure returns (bytes memory ret) {
        address sender = getSender(userOp);
        uint256 nonce = userOp.nonce;
        bytes32 hashInitCode = calldataKeccak(userOp.initCode);
        bytes32 hashCallData = calldataKeccak(userOp.callData);
        uint256 callGasLimit = userOp.callGasLimit;
        uint256 verificationGasLimit = userOp.verificationGasLimit;
        uint256 preVerificationGas = userOp.preVerificationGas;
        uint256 maxFeePerGas = userOp.maxFeePerGas;
        uint256 maxPriorityFeePerGas = userOp.maxPriorityFeePerGas;
        bytes32 hashPaymasterAndData = calldataKeccak(userOp.paymasterAndData);

        return abi.encode(
            sender, nonce,
            hashInitCode, hashCallData,
            callGasLimit, verificationGasLimit, preVerificationGas,
            maxFeePerGas, maxPriorityFeePerGas,
            hashPaymasterAndData
        );
    }

    function hash(UserOperation calldata userOp) internal pure returns (bytes32) {
        return keccak256(pack(userOp));
    }

    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

/* solhint-disable no-inline-assembly */

/**
 * returned data from validateUserOp.
 * validateUserOp returns a uint256, with is created by `_packedValidationData` and parsed by `_parseValidationData`
 * @param aggregator - address(0) - the account validated the signature by itself.
 *              address(1) - the account failed to validate the signature.
 *              otherwise - this is an address of a signature aggregator that must be used to validate the signature.
 * @param validAfter - this UserOp is valid only after this timestamp.
 * @param validaUntil - this UserOp is valid only up to this timestamp.
 */
    struct ValidationData {
        address aggregator;
        uint48 validAfter;
        uint48 validUntil;
    }

//extract sigFailed, validAfter, validUntil.
// also convert zero validUntil to type(uint48).max
    function _parseValidationData(uint validationData) pure returns (ValidationData memory data) {
        address aggregator = address(uint160(validationData));
        uint48 validUntil = uint48(validationData >> 160);
        if (validUntil == 0) {
            validUntil = type(uint48).max;
        }
        uint48 validAfter = uint48(validationData >> (48 + 160));
        return ValidationData(aggregator, validAfter, validUntil);
    }

// intersect account and paymaster ranges.
    function _intersectTimeRange(uint256 validationData, uint256 paymasterValidationData) pure returns (ValidationData memory) {
        ValidationData memory accountValidationData = _parseValidationData(validationData);
        ValidationData memory pmValidationData = _parseValidationData(paymasterValidationData);
        address aggregator = accountValidationData.aggregator;
        if (aggregator == address(0)) {
            aggregator = pmValidationData.aggregator;
        }
        uint48 validAfter = accountValidationData.validAfter;
        uint48 validUntil = accountValidationData.validUntil;
        uint48 pmValidAfter = pmValidationData.validAfter;
        uint48 pmValidUntil = pmValidationData.validUntil;

        if (validAfter < pmValidAfter) validAfter = pmValidAfter;
        if (validUntil > pmValidUntil) validUntil = pmValidUntil;
        return ValidationData(aggregator, validAfter, validUntil);
    }

/**
 * helper to pack the return value for validateUserOp
 * @param data - the ValidationData to pack
 */
    function _packValidationData(ValidationData memory data) pure returns (uint256) {
        return uint160(data.aggregator) | (uint256(data.validUntil) << 160) | (uint256(data.validAfter) << (160 + 48));
    }

/**
 * helper to pack the return value for validateUserOp, when not using an aggregator
 * @param sigFailed - true for signature failure, false for success
 * @param validUntil last timestamp this UserOperation is valid (or zero for infinite)
 * @param validAfter first timestamp this UserOperation is valid
 */
    function _packValidationData(bool sigFailed, uint48 validUntil, uint48 validAfter) pure returns (uint256) {
        return (sigFailed ? 1 : 0) | (uint256(validUntil) << 160) | (uint256(validAfter) << (160 + 48));
    }

/**
 * keccak function over calldata.
 * @dev copy calldata into memory, do keccak and drop allocated memory. Strangely, this is more efficient than letting solidity do it.
 */
    function calldataKeccak(bytes calldata data) pure returns (bytes32 ret) {
        assembly {
            let mem := mload(0x40)
            let len := data.length
            calldatacopy(mem, data.offset, len)
            ret := keccak256(mem, len)
        }
    }

{
  "remappings": [
    "account-abstraction/=lib/account-abstraction/contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "solady/=lib/solady/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": false
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": true,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"kernel","type":"address"},{"indexed":true,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"disable","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"ecdsaValidatorStorage","outputs":[{"internalType":"address","name":"owner","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"enable","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_caller","type":"address"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"validCaller","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"hash","type":"bytes32"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"validateSignature","outputs":[{"internalType":"ValidationData","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"bytes","name":"initCode","type":"bytes"},{"internalType":"bytes","name":"callData","type":"bytes"},{"internalType":"uint256","name":"callGasLimit","type":"uint256"},{"internalType":"uint256","name":"verificationGasLimit","type":"uint256"},{"internalType":"uint256","name":"preVerificationGas","type":"uint256"},{"internalType":"uint256","name":"maxFeePerGas","type":"uint256"},{"internalType":"uint256","name":"maxPriorityFeePerGas","type":"uint256"},{"internalType":"bytes","name":"paymasterAndData","type":"bytes"},{"internalType":"bytes","name":"signature","type":"bytes"}],"internalType":"struct UserOperation","name":"_userOp","type":"tuple"},{"internalType":"bytes32","name":"_userOpHash","type":"bytes32"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"validateUserOp","outputs":[{"internalType":"ValidationData","name":"validationData","type":"uint256"}],"stateMutability":"payable","type":"function"}]

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