false
false

Contract Address Details

0x58D8ECe142c60f5707594a7C1D90e46eAE5AF431

Contract Name
WitnetProxy
Creator
0x8d86bc–44ea8b at 0xf940aa–238694
Implementation
0x0f17043bb821f609670dbcce36b6f19fd42829b2
Balance
0 KCS
Tokens
Fetching tokens...
Transactions
148,529 Transactions
Transfers
0 Transfers
Gas Used
15,219,696,799
Last Balance Update
32321126
Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
Contract name:
WitnetProxy




Optimization enabled
true
Compiler version
v0.8.9+commit.e5eed63a




Optimization runs
200
EVM Version
default




Verified at
2021-12-13T12:56:47.879190Z

Contract source code

// SPDX-License-Identifier: MIT


pragma solidity >=0.6.0 <0.9.0;

pragma experimental ABIEncoderV2;

// File: contracts\patterns\Initializable.sol
interface Initializable {
    /// @dev Initialize contract's storage context.
    function initialize(bytes calldata) external;
}
// File: contracts\patterns\Proxiable.sol
interface Proxiable {
    /// @dev Complying with EIP-1822: Universal Upgradable Proxy Standard (UUPS)
    /// @dev See https://eips.ethereum.org/EIPS/eip-1822.
    function proxiableUUID() external pure returns (bytes32);
}
// File: contracts\patterns\Upgradable.sol
/* solhint-disable var-name-mixedcase */




abstract contract Upgradable is Initializable, Proxiable {

    address internal immutable _BASE;
    bytes32 internal immutable _CODEHASH;
    bool internal immutable _UPGRADABLE;

    /// Emitted every time the contract gets upgraded.
    /// @param from The address who ordered the upgrading. Namely, the WRB operator in "trustable" implementations.
    /// @param baseAddr The address of the new implementation contract.
    /// @param baseCodehash The EVM-codehash of the new implementation contract.
    /// @param versionTag Ascii-encoded version literal with which the implementation deployer decided to tag it.
    event Upgraded(
        address indexed from,
        address indexed baseAddr,
        bytes32 indexed baseCodehash,
        bytes32 versionTag
    );

    constructor (bool _isUpgradable) {
        address _base = address(this);
        bytes32 _codehash;        
        assembly {
            _codehash := extcodehash(_base)
        }
        _BASE = _base;
        _CODEHASH = _codehash;        
        _UPGRADABLE = _isUpgradable;
    }

    /// @dev Tells whether provided address could eventually upgrade the contract.
    function isUpgradableFrom(address from) virtual external view returns (bool);


    /// TODO: the following methods should be all declared as pure 
    ///       whenever this Solidity's PR gets merged and released: 
    ///       https://github.com/ethereum/solidity/pull/10240

    /// @dev Retrieves base contract. Differs from address(this) when via delegate-proxy pattern.
    function base() public view returns (address) {
        return _BASE;
    }

    /// @dev Retrieves the immutable codehash of this contract, even if invoked as delegatecall.
    /// @return _codehash This contracts immutable codehash.
    function codehash() public view returns (bytes32 _codehash) {
        return _CODEHASH;
    }
    
    /// @dev Determines whether current instance allows being upgraded.
    /// @dev Returned value should be invariant from whoever is calling.
    function isUpgradable() public view returns (bool) {        
        return _UPGRADABLE;
    }

    /// @dev Retrieves human-redable named version of current implementation.
    function version() virtual public view returns (bytes32); 
}
// File: contracts\impls\WitnetProxy.sol
/// @title WitnetProxy: upgradable delegate-proxy contract that routes Witnet data requests coming from a 
/// `UsingWitnet`-inheriting contract to a currently active `WitnetRequestBoard` implementation. 
/// @author The Witnet Foundation.
contract WitnetProxy {

    struct WitnetProxySlot {
        address implementation;
    }

    /// Event emitted every time the implementation gets updated.
    event Upgraded(address indexed implementation);  

    /// Constructor with no params as to ease eventual support of Singleton pattern (i.e. ERC-2470).
    constructor () {}

    /// WitnetProxies will never accept direct transfer of ETHs.
    receive() external payable {
        revert("WitnetProxy: no transfers accepted");
    }

    /// Payable fallback accepts delegating calls to payable functions.  
    fallback() external payable { /* solhint-disable no-complex-fallback */
        address _implementation = implementation();

        assembly { /* solhint-disable avoid-low-level-calls */
            // Gas optimized delegate call to 'implementation' contract.
            // Note: `msg.data`, `msg.sender` and `msg.value` will be passed over 
            //       to actual implementation of `msg.sig` within `implementation` contract.
            let ptr := mload(0x40)
            calldatacopy(ptr, 0, calldatasize())
            let result := delegatecall(gas(), _implementation, ptr, calldatasize(), 0, 0)
            let size := returndatasize()
            returndatacopy(ptr, 0, size)
            switch result
                case 0  { 
                    // pass back revert message:
                    revert(ptr, size) 
                }
                default {
                  // pass back same data as returned by 'implementation' contract:
                  return(ptr, size) 
                }
        }
    }

    /// Returns proxy's current implementation address.
    function implementation() public view returns (address) {
        return _proxySlot().implementation;
    }

    /// Upgrades the `implementation` address.
    /// @param _newImplementation New implementation address.
    /// @param _initData Raw data with which new implementation will be initialized.
    /// @return Returns whether new implementation would be further upgradable, or not.
    function upgradeTo(address _newImplementation, bytes memory _initData)
        public returns (bool)
    {
        // New implementation cannot be null:
        require(_newImplementation != address(0), "WitnetProxy: null implementation");

        address _oldImplementation = implementation();
        if (_oldImplementation != address(0)) {
            // New implementation address must differ from current one:
            require(_newImplementation != _oldImplementation, "WitnetProxy: nothing to upgrade");

            // Assert whether current implementation is intrinsically upgradable:
            try Upgradable(_oldImplementation).isUpgradable() returns (bool _isUpgradable) {
                require(_isUpgradable, "WitnetProxy: not upgradable");
            } catch {
                revert("WitnetProxy: unable to check upgradability");
            }

            // Assert whether current implementation allows `msg.sender` to upgrade the proxy:
            (bool _wasCalled, bytes memory _result) = _oldImplementation.delegatecall(
                abi.encodeWithSignature(
                    "isUpgradableFrom(address)",
                    msg.sender
                )
            );
            require(_wasCalled, "WitnetProxy: not compliant");
            require(abi.decode(_result, (bool)), "WitnetProxy: not authorized");
            require(
                Upgradable(_oldImplementation).proxiableUUID() == Upgradable(_newImplementation).proxiableUUID(),
                "WitnetProxy: proxiableUUIDs mismatch"
            );
        }

        // Initialize new implementation within proxy-context storage:
        (bool _wasInitialized,) = _newImplementation.delegatecall(
            abi.encodeWithSignature(
                "initialize(bytes)",
                _initData
            )
        );
        require(_wasInitialized, "WitnetProxy: unable to initialize");

        // If all checks and initialization pass, update implementation address:
        _proxySlot().implementation = _newImplementation;
        emit Upgraded(_newImplementation);

        // Asserts new implementation complies w/ minimal implementation of Upgradable interface:
        try Upgradable(_newImplementation).isUpgradable() returns (bool _isUpgradable) {
            return _isUpgradable;
        }
        catch {
            revert ("WitnetProxy: not compliant");
        }
    }

    /// @dev Complying with EIP-1967, retrieves storage struct containing proxy's current implementation address.
    function _proxySlot() private pure returns (WitnetProxySlot storage _slot) {
        assembly {
            // bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)
            _slot.slot := 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc
        }
    }

}
        

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","inputs":[]},{"type":"event","name":"Upgraded","inputs":[{"type":"address","name":"implementation","internalType":"address","indexed":true}],"anonymous":false},{"type":"fallback","stateMutability":"payable"},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"implementation","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"upgradeTo","inputs":[{"type":"address","name":"_newImplementation","internalType":"address"},{"type":"bytes","name":"_initData","internalType":"bytes"}]},{"type":"receive","stateMutability":"payable"}]
              

Contract Creation Code

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Deployed ByteCode

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