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Outline

•  contract PProxyStorage *
•    - function readBool(bytes32 _key)
•    - function setBool(bytes32 _key, bool _ ...
•    - function readAddress(bytes32 _key)
•    - function setAddress(bytes32 _key, add ...
•    - function storageRead(bytes32 _key)
•    - function storageSet(bytes32 _key, byt ...
•    - function bytes32ToAddress(bytes32 _va ...
•    - function addressToBytes32(address _va ...
•  contract PProxy is PProxyStorage *
•    - function getProxyOwner()
•    - function setProxyOwner(address _newOw ...
•    - function getImplementation()
•    - function setImplementation(address _n ...
•    - function internalFallback()

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/**
 *Submitted for verification at Etherscan.io on 2020-12-04
*/

pragma solidity ^0.6.2;

contract PProxyStorage {

    function readBool(bytes32 _key) public view returns(bool) {
        return storageRead(_key) == bytes32(uint256(1));
    }

    function setBool(bytes32 _key, bool _value) internal {
        if(_value) {
            storageSet(_key, bytes32(uint256(1)));
        } else {
            storageSet(_key, bytes32(uint256(0)));
        }
    }

    function readAddress(bytes32 _key) public view returns(address) {
        return bytes32ToAddress(storageRead(_key));
    }

    function setAddress(bytes32 _key, address _value) internal {
        storageSet(_key, addressToBytes32(_value));
    }

    function storageRead(bytes32 _key) public view returns(bytes32) {
        bytes32 value;
        //solium-disable-next-line security/no-inline-assembly
        assembly {
            value := sload(_key)
        }
        return value;
    }

    function storageSet(bytes32 _key, bytes32 _value) internal {
        // targetAddress = _address;  // No!
        bytes32 implAddressStorageKey = _key;
        //solium-disable-next-line security/no-inline-assembly
        assembly {
            sstore(implAddressStorageKey, _value)
        }
    }

    function bytes32ToAddress(bytes32 _value) public pure returns(address) {
        return address(uint160(uint256(_value)));
    }

    function addressToBytes32(address _value) public pure returns(bytes32) {
        return bytes32(uint256(_value));
    }

}

contract PProxy is PProxyStorage {

    bytes32 constant IMPLEMENTATION_SLOT = keccak256(abi.encodePacked("IMPLEMENTATION_SLOT"));
    bytes32 constant OWNER_SLOT = keccak256(abi.encodePacked("OWNER_SLOT"));

    modifier onlyProxyOwner() {
        require(msg.sender == readAddress(OWNER_SLOT), "PProxy.onlyProxyOwner: msg sender not owner");
        _;
    }

    constructor () public {
        setAddress(OWNER_SLOT, msg.sender);
    }

    function getProxyOwner() public view returns (address) {
       return readAddress(OWNER_SLOT);
    }

    function setProxyOwner(address _newOwner) onlyProxyOwner public {
        setAddress(OWNER_SLOT, _newOwner);
    }

    function getImplementation() public view returns (address) {
        return readAddress(IMPLEMENTATION_SLOT);
    }

    function setImplementation(address _newImplementation) onlyProxyOwner public {
        setAddress(IMPLEMENTATION_SLOT, _newImplementation);
    }


    fallback () external payable {
       return internalFallback();
    }

    function internalFallback() internal virtual {
        address contractAddr = readAddress(IMPLEMENTATION_SLOT);
        assembly {
            let ptr := mload(0x40)
            calldatacopy(ptr, 0, calldatasize())
            let result := delegatecall(gas(), contractAddr, ptr, calldatasize(), 0, 0)
            let size := returndatasize()
            returndatacopy(ptr, 0, size)

            switch result
            case 0 { revert(ptr, size) }
            default { return(ptr, size) }
        }
    }

}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"address","name":"_value","type":"address"}],"name":"addressToBytes32","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_value","type":"bytes32"}],"name":"bytes32ToAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getImplementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getProxyOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"readAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"readBool","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newImplementation","type":"address"}],"name":"setImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"setProxyOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"storageRead","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"}]

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