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ParaProxy
- Verified
- Proxy
Verified
This contract is a proxy and the implementation details are not yet known.
0x638a98bbb92a7582d07c52ff407d49664dc8b3ee
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
/******************************************************************************\
* A custom implementation of EIP-2535
* EIP-2535: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
import {ParaProxyLib} from "./lib/ParaProxyLib.sol";
import {IParaProxy} from "../../../interfaces/IParaProxy.sol";
contract ParaProxy is IParaProxy {
constructor(address _contractOwner) payable {
ParaProxyLib.setContractOwner(_contractOwner);
}
function updateImplementation(
ProxyImplementation[] calldata _implementationParams,
address _init,
bytes calldata _calldata
) external override {
ParaProxyLib.enforceIsContractOwner();
ParaProxyLib.updateImplementation(
_implementationParams,
_init,
_calldata
);
}
// Find implementation for function that is called and execute the
// function if a implementation is found and return any value.
fallback() external payable {
ParaProxyLib.ProxyStorage storage ds;
bytes32 position = ParaProxyLib.PROXY_STORAGE_POSITION;
// get proxy storage
assembly {
ds.slot := position
}
// get implementation from function selector
address implementation = ds
.selectorToImplAndPosition[msg.sig]
.implAddress;
require(
implementation != address(0),
"ParaProxy: Function does not exist"
);
// Execute external function from implementation using delegatecall and return any value.
assembly {
// copy function selector and any arguments
calldatacopy(0, 0, calldatasize())
// execute function call using the implementation
let result := delegatecall(
gas(),
implementation,
0,
calldatasize(),
0,
0
)
// get any return value
returndatacopy(0, 0, returndatasize())
// return any return value or error back to the caller
switch result
case 0 {
revert(0, returndatasize())
}
default {
return(0, returndatasize())
}
}
}
receive() external payable {}
}
// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.10;
/******************************************************************************\
* EIP-2535: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
interface IParaProxy {
enum ProxyImplementationAction {
Add,
Replace,
Remove
}
// Add=0, Replace=1, Remove=2
struct ProxyImplementation {
address implAddress;
ProxyImplementationAction action;
bytes4[] functionSelectors;
}
/// @notice Add/replace/remove any number of functions and optionally execute
/// a function with delegatecall
/// @param _implementationParams Contains the implementation addresses and function selectors
/// @param _init The address of the contract or implementation to execute _calldata
/// @param _calldata A function call, including function selector and arguments
/// _calldata is executed with delegatecall on _init
function updateImplementation(
ProxyImplementation[] calldata _implementationParams,
address _init,
bytes calldata _calldata
) external;
event ImplementationUpdated(
ProxyImplementation[] _implementationParams,
address _init,
bytes _calldata
);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
/******************************************************************************\
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
import {IParaProxy} from "../../../../interfaces/IParaProxy.sol";
library ParaProxyLib {
bytes32 constant PROXY_STORAGE_POSITION =
bytes32(
uint256(keccak256("paraspace.proxy.implementation.storage")) - 1
);
struct ImplementationAddressAndPosition {
address implAddress;
uint96 functionSelectorPosition; // position in implementationFunctionSelectors.functionSelectors array
}
struct ImplementationFunctionSelectors {
bytes4[] functionSelectors;
uint256 implementationAddressPosition; // position of implAddress in implementationAddresses array
}
struct ProxyStorage {
// maps function selector to the implementation address and
// the position of the selector in the implementationFunctionSelectors.selectors array
mapping(bytes4 => ImplementationAddressAndPosition) selectorToImplAndPosition;
// maps implementation addresses to function selectors
mapping(address => ImplementationFunctionSelectors) implementationFunctionSelectors;
// implementation addresses
address[] implementationAddresses;
// Used to query if a contract implements an interface.
// Used to implement ERC-165.
mapping(bytes4 => bool) supportedInterfaces;
// owner of the contract
address contractOwner;
}
function diamondStorage() internal pure returns (ProxyStorage storage ds) {
bytes32 position = PROXY_STORAGE_POSITION;
assembly {
ds.slot := position
}
}
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
function setContractOwner(address _newOwner) internal {
ProxyStorage storage ds = diamondStorage();
address previousOwner = ds.contractOwner;
ds.contractOwner = _newOwner;
emit OwnershipTransferred(previousOwner, _newOwner);
}
function contractOwner() internal view returns (address contractOwner_) {
contractOwner_ = diamondStorage().contractOwner;
}
function enforceIsContractOwner() internal view {
require(
msg.sender == diamondStorage().contractOwner,
"ParaProxy: Must be contract owner"
);
}
event ImplementationUpdated(
IParaProxy.ProxyImplementation[] _implementationData,
address _init,
bytes _calldata
);
// Internal function version of diamondCut
function updateImplementation(
IParaProxy.ProxyImplementation[] memory _implementationData,
address _init,
bytes memory _calldata
) internal {
for (
uint256 implIndex;
implIndex < _implementationData.length;
implIndex++
) {
IParaProxy.ProxyImplementationAction action = _implementationData[
implIndex
].action;
if (action == IParaProxy.ProxyImplementationAction.Add) {
addFunctions(
_implementationData[implIndex].implAddress,
_implementationData[implIndex].functionSelectors
);
} else if (action == IParaProxy.ProxyImplementationAction.Replace) {
replaceFunctions(
_implementationData[implIndex].implAddress,
_implementationData[implIndex].functionSelectors
);
} else if (action == IParaProxy.ProxyImplementationAction.Remove) {
removeFunctions(
_implementationData[implIndex].implAddress,
_implementationData[implIndex].functionSelectors
);
} else {
revert("ParaProxy: Incorrect ProxyImplementationAction");
}
}
emit ImplementationUpdated(_implementationData, _init, _calldata);
initializeImplementation(_init, _calldata);
}
function addFunctions(
address _implementationAddress,
bytes4[] memory _functionSelectors
) internal {
require(
_functionSelectors.length > 0,
"ParaProxy: No selectors in implementation to cut"
);
ProxyStorage storage ds = diamondStorage();
require(
_implementationAddress != address(0),
"ParaProxy: Add implementation can't be address(0)"
);
uint96 selectorPosition = uint96(
ds
.implementationFunctionSelectors[_implementationAddress]
.functionSelectors
.length
);
// add new implementation address if it does not exist
if (selectorPosition == 0) {
addFacet(ds, _implementationAddress);
}
for (
uint256 selectorIndex;
selectorIndex < _functionSelectors.length;
selectorIndex++
) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldImplementationAddress = ds
.selectorToImplAndPosition[selector]
.implAddress;
require(
oldImplementationAddress == address(0),
"ParaProxy: Can't add function that already exists"
);
addFunction(ds, selector, selectorPosition, _implementationAddress);
selectorPosition++;
}
}
function replaceFunctions(
address _implementationAddress,
bytes4[] memory _functionSelectors
) internal {
require(
_functionSelectors.length > 0,
"ParaProxy: No selectors in implementation to cut"
);
ProxyStorage storage ds = diamondStorage();
require(
_implementationAddress != address(0),
"ParaProxy: Add implementation can't be address(0)"
);
uint96 selectorPosition = uint96(
ds
.implementationFunctionSelectors[_implementationAddress]
.functionSelectors
.length
);
// add new implementation address if it does not exist
if (selectorPosition == 0) {
addFacet(ds, _implementationAddress);
}
for (
uint256 selectorIndex;
selectorIndex < _functionSelectors.length;
selectorIndex++
) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldImplementationAddress = ds
.selectorToImplAndPosition[selector]
.implAddress;
require(
oldImplementationAddress != _implementationAddress,
"ParaProxy: Can't replace function with same function"
);
removeFunction(ds, oldImplementationAddress, selector);
addFunction(ds, selector, selectorPosition, _implementationAddress);
selectorPosition++;
}
}
function removeFunctions(
address _implementationAddress,
bytes4[] memory _functionSelectors
) internal {
require(
_functionSelectors.length > 0,
"ParaProxy: No selectors in implementation to cut"
);
ProxyStorage storage ds = diamondStorage();
// if function does not exist then do nothing and return
require(
_implementationAddress == address(0),
"ParaProxy: Remove implementation address must be address(0)"
);
for (
uint256 selectorIndex;
selectorIndex < _functionSelectors.length;
selectorIndex++
) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldImplementationAddress = ds
.selectorToImplAndPosition[selector]
.implAddress;
removeFunction(ds, oldImplementationAddress, selector);
}
}
function addFacet(ProxyStorage storage ds, address _implementationAddress)
internal
{
enforceHasContractCode(
_implementationAddress,
"ParaProxy: New implementation has no code"
);
ds
.implementationFunctionSelectors[_implementationAddress]
.implementationAddressPosition = ds.implementationAddresses.length;
ds.implementationAddresses.push(_implementationAddress);
}
function addFunction(
ProxyStorage storage ds,
bytes4 _selector,
uint96 _selectorPosition,
address _implementationAddress
) internal {
ds
.selectorToImplAndPosition[_selector]
.functionSelectorPosition = _selectorPosition;
ds
.implementationFunctionSelectors[_implementationAddress]
.functionSelectors
.push(_selector);
ds
.selectorToImplAndPosition[_selector]
.implAddress = _implementationAddress;
}
function removeFunction(
ProxyStorage storage ds,
address _implementationAddress,
bytes4 _selector
) internal {
require(
_implementationAddress != address(0),
"ParaProxy: Can't remove function that doesn't exist"
);
// an immutable function is a function defined directly in a paraProxy
require(
_implementationAddress != address(this),
"ParaProxy: Can't remove immutable function"
);
// replace selector with last selector, then delete last selector
uint256 selectorPosition = ds
.selectorToImplAndPosition[_selector]
.functionSelectorPosition;
uint256 lastSelectorPosition = ds
.implementationFunctionSelectors[_implementationAddress]
.functionSelectors
.length - 1;
// if not the same then replace _selector with lastSelector
if (selectorPosition != lastSelectorPosition) {
bytes4 lastSelector = ds
.implementationFunctionSelectors[_implementationAddress]
.functionSelectors[lastSelectorPosition];
ds
.implementationFunctionSelectors[_implementationAddress]
.functionSelectors[selectorPosition] = lastSelector;
ds
.selectorToImplAndPosition[lastSelector]
.functionSelectorPosition = uint96(selectorPosition);
}
// delete the last selector
ds
.implementationFunctionSelectors[_implementationAddress]
.functionSelectors
.pop();
delete ds.selectorToImplAndPosition[_selector];
// if no more selectors for implementation address then delete the implementation address
if (lastSelectorPosition == 0) {
// replace implementation address with last implementation address and delete last implementation address
uint256 lastImplementationAddressPosition = ds
.implementationAddresses
.length - 1;
uint256 implementationAddressPosition = ds
.implementationFunctionSelectors[_implementationAddress]
.implementationAddressPosition;
if (
implementationAddressPosition !=
lastImplementationAddressPosition
) {
address lastImplementationAddress = ds.implementationAddresses[
lastImplementationAddressPosition
];
ds.implementationAddresses[
implementationAddressPosition
] = lastImplementationAddress;
ds
.implementationFunctionSelectors[lastImplementationAddress]
.implementationAddressPosition = implementationAddressPosition;
}
ds.implementationAddresses.pop();
delete ds
.implementationFunctionSelectors[_implementationAddress]
.implementationAddressPosition;
}
}
function initializeImplementation(address _init, bytes memory _calldata)
internal
{
if (_init == address(0)) {
require(
_calldata.length == 0,
"ParaProxy: _init is address(0) but_calldata is not empty"
);
} else {
require(
_calldata.length > 0,
"ParaProxy: _calldata is empty but _init is not address(0)"
);
if (_init != address(this)) {
enforceHasContractCode(
_init,
"ParaProxy: _init address has no code"
);
}
(bool success, bytes memory error) = _init.delegatecall(_calldata);
if (!success) {
if (error.length > 0) {
// bubble up the error
revert(string(error));
} else {
revert("ParaProxy: _init function reverted");
}
}
}
}
function enforceHasContractCode(
address _contract,
string memory _errorMessage
) internal view {
uint256 contractSize;
assembly {
contractSize := extcodesize(_contract)
}
require(contractSize > 0, _errorMessage);
}
}
ParaProxy ABI
Copied
[{"inputs":[{"internalType":"address","name":"_contractOwner","type":"address"}],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"components":[{"internalType":"address","name":"implAddress","type":"address"},{"internalType":"enum IParaProxy.ProxyImplementationAction","name":"action","type":"uint8"},{"internalType":"bytes4[]","name":"functionSelectors","type":"bytes4[]"}],"indexed":false,"internalType":"struct IParaProxy.ProxyImplementation[]","name":"_implementationParams","type":"tuple[]"},{"indexed":false,"internalType":"address","name":"_init","type":"address"},{"indexed":false,"internalType":"bytes","name":"_calldata","type":"bytes"}],"name":"ImplementationUpdated","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"components":[{"internalType":"address","name":"implAddress","type":"address"},{"internalType":"enum IParaProxy.ProxyImplementationAction","name":"action","type":"uint8"},{"internalType":"bytes4[]","name":"functionSelectors","type":"bytes4[]"}],"internalType":"struct IParaProxy.ProxyImplementation[]","name":"_implementationParams","type":"tuple[]"},{"internalType":"address","name":"_init","type":"address"},{"internalType":"bytes","name":"_calldata","type":"bytes"}],"name":"updateImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]ParaProxy Bytecode
Copied
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Checkout more smart contracts
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SHILAINU
Verified
The following smart contract is the SHILAINU token contract, which is an ERC20 token with a total supply of 1 trillion. It includes features such as transaction limits, fees, and automatic liquidity provision. The contract also has a blacklist mode and the ability to set fee and transaction exemptions for specific addresses. The purpose of the contract is to provide a decentralized currency for the Shiba Inu community.
0x20c3fa331a385b63ee39137e99d0cf2db142fce1
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Token
Verified
The following smart contract is a token contract that implements the ERC20 standard. It includes features such as a fee system, wallet and transaction limits, and liquidity provision. The contract also allows for the destruction of tokens through a fee system. The contract is designed to be used with the Uniswap decentralized exchange.
0xd015422879a1308ba557510345e944b912b9ab73
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