erc-3643/contracts/_testContracts/v_3_5_2/LegacyProxy.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.17;

interface IImplementationAuthorityLegacy {
    function getImplementation() external view returns (address);
}

contract LegacyProxy {
    address public implementationAuthority;

    constructor(
        address _implementationAuthority,
        address _identityRegistry,
        address _compliance,
        string memory _name,
        string memory _symbol,
        uint8 _decimals,
        address _onchainID
    ) {
        implementationAuthority = _implementationAuthority;

        address logic = IImplementationAuthorityLegacy(implementationAuthority).getImplementation();

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) =
        logic.delegatecall(
            abi.encodeWithSignature(
                'init(address,address,string,string,uint8,address)',
                _identityRegistry,
                _compliance,
                _name,
                _symbol,
                _decimals,
                _onchainID
            )
        );
        require(success, 'Initialization failed.');
    }

    fallback() external payable {
        address logic = IImplementationAuthorityLegacy(implementationAuthority).getImplementation();

        assembly {
        // solium-disable-line
            calldatacopy(0x0, 0x0, calldatasize())
            let success := delegatecall(sub(gas(), 10000), logic, 0x0, calldatasize(), 0, 0)
            let retSz := returndatasize()
            returndatacopy(0, 0, retSz)
            switch success
            case 0 {
                revert(0, retSz)
            }
            default {
                return(0, retSz)
            }
        }
    }
}