// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import "@openzeppelin/contracts/utils/Address.sol";
contract Proxy {
/* ========= MEMBER VARS ========== */
// Code(Implementation Logic) position in storage is keccak256("implementation.address.slot")-1 = "0xce37950e7cd2678a5aaa22967639b72d05dc378e897c3d84e58abae42ac0f9b6"
// Admin/Owner position in storage is keccak256("admin.address.slot")-1 = "0x5306ace5707e43e9b5b05781f9c753311b483bee34840818000845c91ad8c543"
/* =========== EVENTS =========== */
/**
* @dev Emitted when the _implementation is upgraded.
*/
event Upgraded(
address indexed oldImplementation,
address indexed newImplementation
);
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/* ========== MODIFIERS ============= */
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/* ========== CONSTRUCTOR ========== */
constructor(address contractLogic) {
// save the code address
_upgradeTo(contractLogic);
_transferOwnership(msg.sender);
}
/* ========== EXTERNAL FUNCTIONS ========== */
/**
* @dev fallback
*/
fallback() external {
_delegate();
}
/**
* @dev Upgrade function to be only called by owner
*/
function upgrade(address _newLogic) external onlyOwner {
_upgradeTo(_newLogic);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) external onlyOwner {
require(newOwner != address(0), "Proxy: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev external function to get the current implementation/logic address
*/
function getImplementationAddress() external view returns (address logic) {
return _getImplementationAddress();
}
/**
* @dev external function to get the current admin/owner address
*/
function getOwnerAddress() external view returns (address logic) {
return _getOwnerAddress();
}
/* ========== INTERNAL FUNCTIONS ========== */
/**
* @dev Perform implementation upgrade
*
* Emits an {Upgraded} event.
*/
function _upgradeTo(address _newLogic) internal {
require(
_newLogic != address(0),
"Proxy:new implementation cannot be zero address"
);
require(
Address.isContract(_newLogic),
"Proxy:new implementation is not a contract"
);
require(
_getImplementationAddress() != _newLogic,
"Proxy:new implementation cannot be the same address"
);
assembly {
// solium-disable-line
sstore(
0xce37950e7cd2678a5aaa22967639b72d05dc378e897c3d84e58abae42ac0f9b6,
_newLogic
)
}
emit Upgraded(_getImplementationAddress(), _newLogic);
}
/**
* @dev delegate to implementation logic
*/
function _delegate() internal {
assembly {
// solium-disable-line
let contractLogic := sload(
0xce37950e7cd2678a5aaa22967639b72d05dc378e897c3d84e58abae42ac0f9b6
)
calldatacopy(0x0, 0x0, calldatasize())
let success := delegatecall(
sub(gas(), 10000),
contractLogic,
0x0,
calldatasize(),
0,
0
)
let retSz := returndatasize()
returndatacopy(0, 0, retSz)
switch success
case 0 {
revert(0, retSz)
}
default {
return(0, retSz)
}
}
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
* Emits an {OwnershipTransferred} event.
*/
function _transferOwnership(address _newOwner) internal {
address oldOwner = _getOwnerAddress();
assembly {
// solium-disable-line
sstore(
0x5306ace5707e43e9b5b05781f9c753311b483bee34840818000845c91ad8c543,
_newOwner
)
}
emit OwnershipTransferred(oldOwner, _newOwner);
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view {
require(
_getOwnerAddress() == msg.sender,
"Proxy: caller is not the owner"
);
}
/**
* @dev internal function to get the current implementation/logic address
*/
function _getImplementationAddress() internal view returns (address logic) {
assembly {
// solium-disable-line
logic := sload(
0xce37950e7cd2678a5aaa22967639b72d05dc378e897c3d84e58abae42ac0f9b6
)
}
}
/**
* @dev internal function to get the current admin/owner address
*/
function _getOwnerAddress() internal view returns (address owner) {
assembly {
// solium-disable-line
owner := sload(
0x5306ace5707e43e9b5b05781f9c753311b483bee34840818000845c91ad8c543
)
}
}
}
{
"compilationTarget": {
"contracts/Proxy.sol": "Proxy"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
[{"inputs":[{"internalType":"address","name":"contractLogic","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldImplementation","type":"address"},{"indexed":true,"internalType":"address","name":"newImplementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"nonpayable","type":"fallback"},{"inputs":[],"name":"getImplementationAddress","outputs":[{"internalType":"address","name":"logic","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getOwnerAddress","outputs":[{"internalType":"address","name":"logic","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newLogic","type":"address"}],"name":"upgrade","outputs":[],"stateMutability":"nonpayable","type":"function"}]