all files / contracts/ Proxy.sol

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// SPDX-License-Identifier: GPL-2.0-or-later
 
pragma solidity ^0.8.0;
 
contract Proxy {
    address immutable creator;
 
    constructor() {
        creator = msg.sender;
    }
 
    // External interface
 
    fallback() external {
        address creator_ = creator;
 
        if (msg.sender == creator_) {
            assembly {
                mstore(0, 0)
                calldatacopy(31, 0, calldatasize())
 
                switch mload(0) // numTopics
                    case 0 { log0(32,  sub(calldatasize(), 1)) }
                    case 1 { log1(64,  sub(calldatasize(), 33),  mload(32)) }
                    case 2 { log2(96,  sub(calldatasize(), 65),  mload(32), mload(64)) }
                    case 3 { log3(128, sub(calldatasize(), 97),  mload(32), mload(64), mload(96)) }
                    case 4 { log4(160, sub(calldatasize(), 129), mload(32), mload(64), mload(96), mload(128)) }
                    default { revert(0, 0) }
 
                return(0, 0)
            }
        } else {
            assembly {
                mstore(0, 0xe9c4a3ac00000000000000000000000000000000000000000000000000000000) // dispatch() selector
                calldatacopy(4, 0, calldatasize())
                mstore(add(4, calldatasize()), shl(96, caller()))
 
                let result := call(gas(), creator_, 0, 0, add(24, calldatasize()), 0, 0)
                returndatacopy(0, 0, returndatasize())
 
                switch result
                    case 0 { revert(0, returndatasize()) }
                    default { return(0, returndatasize()) }
            }
        }
    }
}