Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

 contract Proxy    - function ()    - function _implementation()    - function _delegate(address implementa ...    - function _willFallback()    - function _fallback() library OpenZeppelinUpgradesAddress    - function isContract(address account)  contract BaseUpgradeabilityProxy i ...    - function _implementation()    - function _upgradeTo(address newImplem ...    - function _setImplementation(address n ...  contract UpgradeabilityProxy is Ba ...  contract Root is UpgradeabilityPro ... *

More Options

• Is this a proxy?
• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2021-01-02
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.5.17;
pragma experimental ABIEncoderV2;


/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
contract Proxy {
  /**
   * @dev Fallback function.
   * Implemented entirely in `_fallback`.
   */
  function () payable external {
    _fallback();
  }

  /**
   * @return The Address of the implementation.
   */
  function _implementation() internal view returns (address);

  /**
   * @dev Delegates execution to an implementation contract.
   * This is a low level function that doesn't return to its internal call site.
   * It will return to the external caller whatever the implementation returns.
   * @param implementation Address to delegate.
   */
  function _delegate(address implementation) internal {
    assembly {
      // Copy msg.data. We take full control of memory in this inline assembly
      // block because it will not return to Solidity code. We overwrite the
      // Solidity scratch pad at memory position 0.
      calldatacopy(0, 0, calldatasize)

      // Call the implementation.
      // out and outsize are 0 because we don't know the size yet.
      let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)

      // Copy the returned data.
      returndatacopy(0, 0, returndatasize)

      switch result
      // delegatecall returns 0 on error.
      case 0 { revert(0, returndatasize) }
      default { return(0, returndatasize) }
    }
  }

  /**
   * @dev Function that is run as the first thing in the fallback function.
   * Can be redefined in derived contracts to add functionality.
   * Redefinitions must call super._willFallback().
   */
  function _willFallback() internal {
  }

  /**
   * @dev fallback implementation.
   * Extracted to enable manual triggering.
   */
  function _fallback() internal {
    _willFallback();
    _delegate(_implementation());
  }
}

/**
 * Utility library of inline functions on addresses
 *
 * Source https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-solidity/v2.1.3/contracts/utils/Address.sol
 * This contract is copied here and renamed from the original to avoid clashes in the compiled artifacts
 * when the user imports a zos-lib contract (that transitively causes this contract to be compiled and added to the
 * build/artifacts folder) as well as the vanilla Address implementation from an openzeppelin version.
 */
library OpenZeppelinUpgradesAddress {
    /**
     * Returns whether the target address is a contract
     * @dev This function will return false if invoked during the constructor of a contract,
     * as the code is not actually created until after the constructor finishes.
     * @param account address of the account to check
     * @return whether the target address is a contract
     */
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // XXX Currently there is no better way to check if there is a contract in an address
        // than to check the size of the code at that address.
        // See https://ethereum.stackexchange.com/a/14016/36603
        // for more details about how this works.
        // TODO Check this again before the Serenity release, because all addresses will be
        // contracts then.
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

/**
 * @title BaseUpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract BaseUpgradeabilityProxy is Proxy {
  /**
   * @dev Emitted when the implementation is upgraded.
   * @param implementation Address of the new implementation.
   */
  event Upgraded(address indexed implementation);

  /**
   * @dev Storage slot with the address of the current implementation.
   * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
   * validated in the constructor.
   */
  bytes32 internal constant IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

  /**
   * @dev Returns the current implementation.
   * @return Address of the current implementation
   */
  function _implementation() internal view returns (address impl) {
    bytes32 slot = IMPLEMENTATION_SLOT;
    assembly {
      impl := sload(slot)
    }
  }

  /**
   * @dev Upgrades the proxy to a new implementation.
   * @param newImplementation Address of the new implementation.
   */
  function _upgradeTo(address newImplementation) internal {
    _setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }

  /**
   * @dev Sets the implementation address of the proxy.
   * @param newImplementation Address of the new implementation.
   */
  function _setImplementation(address newImplementation) internal {
    require(OpenZeppelinUpgradesAddress.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");

    bytes32 slot = IMPLEMENTATION_SLOT;

    assembly {
      sstore(slot, newImplementation)
    }
  }
}

/**
 * @title UpgradeabilityProxy
 * @dev Extends BaseUpgradeabilityProxy with a constructor for initializing
 * implementation and init data.
 */
contract UpgradeabilityProxy is BaseUpgradeabilityProxy {
  /**
   * @dev Contract constructor.
   * @param _logic Address of the initial implementation.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, bytes memory _data) public payable {
    assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
    _setImplementation(_logic);
    if(_data.length > 0) {
      (bool success,) = _logic.delegatecall(_data);
      require(success);
    }
  }  
}

contract Root is UpgradeabilityProxy {
    constructor (address implementation) UpgradeabilityProxy(
        implementation,
        abi.encodeWithSignature("initialize()")
    ) public { }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"implementation","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"}]

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

0x6080604052600a600c565b005b6012601e565b601e601a6020565b6045565b565b7f360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc5490565b3660008037600080366000845af43d6000803e8080156063573d6000f35b3d6000fd5b3b15159056fea365627a7a72315820c416355a45cc80c5b9166b05be7a60af9b0323074e6d0dcd4934557ea90659276c6578706572696d656e74616cf564736f6c63430005110040

0000000000000000000000004b2544d8fcb8c3fe51ebc15c076adff40a46d88b

-----Decoded View---------------
Arg [0] : implementation (address): 0x4B2544d8fCb8C3fE51eBc15C076adFf40A46d88b

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000004b2544d8fcb8c3fe51ebc15c076adff40a46d88b