Contract
0x58D8ECe142c60f5707594a7C1D90e46eAE5AF431
2
Contract Overview
Balance:
0 Ether
My Name Tag:
Not Available
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Contract Name:
WitnetProxy
Compiler Version
v0.8.13+commit.abaa5c0e
Contract Source Code (Solidity)
/** *Submitted for verification at bobascan.com on 2022-12-12 */ // 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 } } }
[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newImplementation","type":"address"},{"internalType":"bytes","name":"_initData","type":"bytes"}],"name":"upgradeTo","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Swarm Source
ipfs://930139189181032388e9f0edc0b639594bd01ff013ccf55aebd60302b9fe8b80