BaseAccount.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.23;

/* solhint-disable avoid-low-level-calls */
/* solhint-disable no-empty-blocks */

import "../interfaces/IAccount.sol";
import "../interfaces/IEntryPoint.sol";
import "./UserOperationLib.sol";

/**
 * Basic account implementation.
 * This contract provides the basic logic for implementing the IAccount interface - validateUserOp
 * Specific account implementation should inherit it and provide the account-specific logic.
 */
abstract contract BaseAccount is IAccount {
    using UserOperationLib for PackedUserOperation;

    /**
     * Return the account nonce.
     * This method returns the next sequential nonce.
     * For a nonce of a specific key, use `entrypoint.getNonce(account, key)`
     */
    function getNonce() public view virtual returns (uint256) {
        return entryPoint().getNonce(address(this), 0);
    }

    /**
     * Return the entryPoint used by this account.
     * Subclass should return the current entryPoint used by this account.
     */
    function entryPoint() public view virtual returns (IEntryPoint);

    /// @inheritdoc IAccount
    function validateUserOp(
        PackedUserOperation calldata userOp,
        bytes32 userOpHash,
        uint256 missingAccountFunds
    ) external virtual override returns (uint256 validationData) {
        _requireFromEntryPoint();
        validationData = _validateSignature(userOp, userOpHash);
        _validateNonce(userOp.nonce);
        _payPrefund(missingAccountFunds);
    }

    /**
     * Ensure the request comes from the known entrypoint.
     */
    function _requireFromEntryPoint() internal view virtual {
        require(
            msg.sender == address(entryPoint()),
            "account: not from EntryPoint"
        );
    }

    /**
     * Validate the signature is valid for this message.
     * @param userOp          - Validate the userOp.signature field.
     * @param userOpHash      - Convenient field: the hash of the request, to check the signature against.
     *                          (also hashes the entrypoint and chain id)
     * @return validationData - Signature and time-range of this operation.
     *                          <20-byte> aggregatorOrSigFail - 0 for valid signature, 1 to mark signature failure,
     *                                    otherwise, an address of an aggregator contract.
     *                          <6-byte> validUntil - last timestamp this operation is valid. 0 for "indefinite"
     *                          <6-byte> validAfter - first timestamp this operation is valid
     *                          If the account doesn't use time-range, it is enough to return
     *                          SIG_VALIDATION_FAILED value (1) for signature failure.
     *                          Note that the validation code cannot use block.timestamp (or block.number) directly.
     */
    function _validateSignature(
        PackedUserOperation calldata userOp,
        bytes32 userOpHash
    ) internal virtual returns (uint256 validationData);

    /**
     * Validate the nonce of the UserOperation.
     * This method may validate the nonce requirement of this account.
     * e.g.
     * To limit the nonce to use sequenced UserOps only (no "out of order" UserOps):
     *      `require(nonce < type(uint64).max)`
     * For a hypothetical account that *requires* the nonce to be out-of-order:
     *      `require(nonce & type(uint64).max == 0)`
     *
     * The actual nonce uniqueness is managed by the EntryPoint, and thus no other
     * action is needed by the account itself.
     *
     * @param nonce to validate
     *
     * solhint-disable-next-line no-empty-blocks
     */
    function _validateNonce(uint256 nonce) internal view virtual {
    }

    /**
     * Sends to the entrypoint (msg.sender) the missing funds for this transaction.
     * SubClass MAY override this method for better funds management
     * (e.g. send to the entryPoint more than the minimum required, so that in future transactions
     * it will not be required to send again).
     * @param missingAccountFunds - The minimum value this method should send the entrypoint.
     *                              This value MAY be zero, in case there is enough deposit,
     *                              or the userOp has a paymaster.
     */
    function _payPrefund(uint256 missingAccountFunds) internal virtual {
        if (missingAccountFunds != 0) {
            (bool success, ) = payable(msg.sender).call{
                value: missingAccountFunds
            }("");
            (success);
            //ignore failure (its EntryPoint's job to verify, not account.)
        }
    }
}