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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.28;

import {IUniversalSigValidator, IERC1271Wallet} from "./interfaces/IUniversalSigValidator.sol";

contract UniversalSigValidator is IUniversalSigValidator {
    bytes32 private constant ERC6492_DETECTION_SUFFIX =
        0x6492649264926492649264926492649264926492649264926492649264926492;
    bytes4 private constant ERC1271_SUCCESS = 0x1626ba7e;

    constructor() {}

    function isValidSigImpl(
        address _signer,
        bytes32 _hash,
        bytes calldata _signature,
        bool allowSideEffects,
        bool tryPrepare
    ) public returns (bool) {
        uint contractCodeLen = address(_signer).code.length;
        bytes memory sigToValidate;
        // The order here is strictly defined in https://eips.ethereum.org/EIPS/eip-6492
        // - ERC-6492 suffix check and verification first, while being permissive in case the contract is already deployed; if the contract is deployed we will check the sig against the deployed version, this allows 6492 signatures to still be validated while taking into account potential key rotation
        // - ERC-1271 verification if there's contract code
        // - finally, ecrecover
        bool isCounterfactual = bytes32(_signature[_signature.length - 32:_signature.length]) ==
            ERC6492_DETECTION_SUFFIX;
        if (isCounterfactual) {
            address create2Factory;
            bytes memory factoryCalldata;
            (create2Factory, factoryCalldata, sigToValidate) = abi.decode(
                _signature[0:_signature.length - 32],
                (address, bytes, bytes)
            );

            if (contractCodeLen == 0 || tryPrepare) {
                (bool success, bytes memory err) = create2Factory.call(factoryCalldata);
                if (!success) revert ERC6492DeployFailed(err);
            }
        } else {
            sigToValidate = _signature;
        }

        // Try ERC-1271 verification
        if (isCounterfactual || contractCodeLen > 0) {
            try IERC1271Wallet(_signer).isValidSignature(_hash, sigToValidate) returns (bytes4 magicValue) {
                bool isValid = magicValue == ERC1271_SUCCESS;

                // retry, but this time assume the prefix is a prepare call
                if (!isValid && !tryPrepare && contractCodeLen > 0) {
                    return isValidSigImpl(_signer, _hash, _signature, allowSideEffects, true);
                }

                if (contractCodeLen == 0 && isCounterfactual && !allowSideEffects) {
                    // if the call had side effects we need to return the
                    // result using a `revert` (to undo the state changes)
                    assembly {
                        mstore(0, isValid)
                        revert(31, 1)
                    }
                }

                return isValid;
            } catch (bytes memory err) {
                // retry, but this time assume the prefix is a prepare call
                if (!tryPrepare && contractCodeLen > 0) {
                    return isValidSigImpl(_signer, _hash, _signature, allowSideEffects, true);
                }

                revert ERC1271Revert(err);
            }
        }

        // ecrecover verification
        require(_signature.length == 65, "SignatureValidator#recoverSigner: invalid signature length");
        bytes32 r = bytes32(_signature[0:32]);
        bytes32 s = bytes32(_signature[32:64]);
        uint8 v = uint8(_signature[64]);
        if (v != 27 && v != 28) {
            revert("SignatureValidator: invalid signature v value");
        }
        return ecrecover(_hash, v, r, s) == _signer;
    }

    function isValidSigWithSideEffects(
        address _signer,
        bytes32 _hash,
        bytes calldata _signature
    ) external returns (bool) {
        return this.isValidSigImpl(_signer, _hash, _signature, true, false);
    }

    function isValidSig(address _signer, bytes32 _hash, bytes calldata _signature) external returns (bool) {
        try this.isValidSigImpl(_signer, _hash, _signature, false, false) returns (bool isValid) {
            return isValid;
        } catch (bytes memory error) {
            // in order to avoid side effects from the contract getting deployed, the entire call will revert with a single byte result
            uint len = error.length;
            if (len == 1) return error[0] == 0x01;
            // all other errors are simply forwarded, but in custom formats so that nothing else can revert with a single byte in the call
            else
                assembly {
                    revert(error, len)
                }
        }
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.28;

interface IERC1271Wallet {
    function isValidSignature(bytes32 hash, bytes calldata signature) external view returns (bytes4 magicValue);
}

interface IUniversalSigValidator {
    function isValidSig(address _signer, bytes32 _hash, bytes calldata _signature) external returns (bool);

    error ERC1271Revert(bytes error);
    error ERC6492DeployFailed(bytes error);
}

{
  "optimizer": {
    "enabled": true,
    "mode": "3"
  },
  "viaIR": true,
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  },
  "detectMissingLibraries": false,
  "forceEVMLA": false,
  "enableEraVMExtensions": false,
  "codegen": "yul",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"bytes","name":"error","type":"bytes"}],"name":"ERC1271Revert","type":"error"},{"inputs":[{"internalType":"bytes","name":"error","type":"bytes"}],"name":"ERC6492DeployFailed","type":"error"},{"inputs":[{"internalType":"address","name":"_signer","type":"address"},{"internalType":"bytes32","name":"_hash","type":"bytes32"},{"internalType":"bytes","name":"_signature","type":"bytes"}],"name":"isValidSig","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_signer","type":"address"},{"internalType":"bytes32","name":"_hash","type":"bytes32"},{"internalType":"bytes","name":"_signature","type":"bytes"},{"internalType":"bool","name":"allowSideEffects","type":"bool"},{"internalType":"bool","name":"tryPrepare","type":"bool"}],"name":"isValidSigImpl","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_signer","type":"address"},{"internalType":"bytes32","name":"_hash","type":"bytes32"},{"internalType":"bytes","name":"_signature","type":"bytes"}],"name":"isValidSigWithSideEffects","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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