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// SPDX-License-Identifier: MIT
pragma solidity >0.7.5;

/**
 * @title Lib_ResolvedDelegateProxy
 */
contract Lib_ResolvedDelegateProxy {

    /*************
     * Variables *
     *************/

    mapping(string => address) public addressManager;

    /***************
     * Constructor *
     ***************/

    /**
     * @param _proxyTarget Address of the target contract.
     */
    constructor(
        address _proxyTarget
    ) {
        addressManager["proxyTarget"] = _proxyTarget;
        addressManager["proxyOwner"] = msg.sender;
    }

    /**********************
     * Function Modifiers *
     **********************/

    modifier proxyCallIfNotOwner() {
        if (msg.sender == addressManager["proxyOwner"]) {
            _;
        } else {
            // This WILL halt the call frame on completion.
            _doProxyCall();
        }
    }

    /*********************
     * Fallback Function *
     *********************/

    fallback()
        external
        payable
    {
        // Proxy call by default.
        _doProxyCall();
    }

    /********************
     * Public Functions *
     ********************/

    /**
     * Update target
     *
     * @param _proxyTarget address of proxy target contract
     */
    function setTargetContract(
        address _proxyTarget
    )
        proxyCallIfNotOwner
        external
    {
        addressManager["proxyTarget"] = _proxyTarget;
    }

    /**
     * Transfer owner
     */
    function transferProxyOwnership(
        address _newOwner
    )
        proxyCallIfNotOwner
        external
    {
        require(
            _newOwner != address(0),
            "New owner cannot be the zero address."
        );
        addressManager["proxyOwner"] = _newOwner;
    }

    /**
     * Performs the proxy call via a delegatecall.
     */
    function _doProxyCall()
        internal
    {

        require(
            addressManager["proxyOwner"] != address(0),
            "Target address must be initialized."
        );

        (bool success, bytes memory returndata) = addressManager["proxyTarget"].delegatecall(msg.data);

        if (success == true) {
            assembly {
                return(add(returndata, 0x20), mload(returndata))
            }
        } else {
            assembly {
                revert(add(returndata, 0x20), mload(returndata))
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_proxyTarget","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"string","name":"","type":"string"}],"name":"addressManager","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_proxyTarget","type":"address"}],"name":"setTargetContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferProxyOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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