Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/// @title: Hoppy Holiday Frogs!
/// @author: manifold.xyz
import "./manifold/ERC721Creator.sol";
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWKo'. ..;oKWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWk,. .,kWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM0' 'OMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNKl. cNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM0d, 'OMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMO:. .xMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMk,. .xMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMx,. .xMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWo.. .lNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNx' .dNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWWNKOo,. .;dOXNWWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWNK00OOkkxxxddooollc:;'.. ..,;:clloooddxxxkkOO00XNWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWKxc,.... ....,cxXWMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMXo' 'dXMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMXc. .cXMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWd. .dWMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNl cNMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWo. lWMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMk. .OMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMWNKKNWMMMNo. .oNMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMW0l,..'l0WMMNd. .dNMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMM0, ,0MMMW0l'. .'l0WMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMWd. .dWMMMMWXkl;.. ..',;;;,. .,;;;,'.. ..;lkXWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMNl lNMMMMMMMMWX0kdlcc::ccloxk0KXNWWWNKxl;. .;xKNWWWNXK0kxolcc::ccodk0XWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMNc :XMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMXc. cXMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMM0, ,0MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM0' 'OMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMWNXKKKXNNKx, ;xKNNXKKKXNWMMMMMMMMMMMMMMMMMMMMMMMMMX: ;KMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMXx:,.....''. .''.....,:xXMMMMMMMMMMMMMMMMMMMMMMMX: :XMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMNo. .oNMMMMMMMMMMMMMMMMMMMMMMX: :XMMMMMMMMMMMMMMNK0kxdollcccclodxk0XNWMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMNo. .oNMMMMMMMMMMMMMMMMMMMMMMNc :XMMMMMMMMMMNOd:,.. ..,:okXWMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMNkl:::;:;;,. .,;;:::cclxXMMMMMMMMMMMMMMMMMMMMMMMNc cNMMMMMMMWKo,. .'l0WMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMWWWWWWNKx' 'xXNWWWWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNc cNMMMMMMXd. .dNMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMX: :XMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNc cNMMMMMK:. .cXMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMNk:. .:ONMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNc cNMMMMK: .cXMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMWNXXK000000Oxl,. .,ldk000KKKXXXNWMMMMMMMMMMMMMMMMMMMNl cNMMMWd. .xWMMMMMMMMMMMMMMM //
// MMMMMMMMMWOo:,'........ ........'';lOWMMMMMMMMMMMMMMMMNl cNMMMX: lNMMMMMMMMMMMMMMM //
// MMMMMMMMMO' 'OMMMMMMMMMMMMMMMMNl cNMMMNo. .dWMMMMMMMMMMMMMMM //
// MMMMMMMMMK:. .:KMMMMMMMMMMMMMMMMNl lNMMMMXl. .oNMMMMMMMMMMMMMMMM //
// MMMMMMMMMMXkoc:;;;;;:cllc' ':lcc;;,,;;:cokXMMMMMMMMMMMMMMMMMNl .oWMMMMMNk;. .;OWMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMWWWWWWWMMMWXl. .lXWMMMWWWWWWWMMMMMMMMMMMMMMMMMMMMMNl .oWMMMMMMMNk:. .'ckNMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMXo. .lXMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNl .oWMMMMMMMMMWKkoc;,.. ..';cokXWMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMWWWNKOo,. ,okKNWWMMMMMMMMMMMMMMMMMMMMMMMMMMWl .oWMMMMMMMMMMMMMMWNX0kl' .,ok0XNWMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMNKOkddoolllccc::;;'.. ..';;:ccclllloodxkOKNMMMMMMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMKc. .lXMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// NOl,.. ..;lONMMMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMM0' ,0MMMMMMMMMMMMMMMMWXOxkKNMMMMMMMMMM //
// :. .cKMMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMMK, ;KMMMMMMMMMMMMMMMWk,. .:OWMMMMMMMM //
// .dWMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMMK, ;XMMMMMMMMMMMMMMM0, :XMMMMMMMM //
// . .xWMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMMK; ;XMMMMMMMMMMMMMMMO. ,KMMMMMMMM //
// : :XMMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMMK; ;XMMMMMMMMMMMMMMMK; '0MMMMMMMM //
// Kc. .cKMMMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMMK; ;XMMMMMMMMMMMMMMMNc .kMMMMMMMM //
// MNOc'. .'cONMMMMMMMMWo. .oWMMMMMMMMMMMMMMMMMMMMMK; ;KMMMMMMMMMMMMMMMX: .oNMMMMMMM //
// MMMWXOdlc;;,;;;::cccccc:'. .;ccllccc::;;;;;cldOXWMMMMMMMMMMNc cXMMMMMMMMMMMMMMMMMMMMMK; ;KMMMMMMMMMMMMMMWx. .dNMMMMMM //
// MMMMMMMMMWWWWWWWMMMMMMMWXl. .cKWMMMMMMMMWWWWWWMMMMMMMMMMMMMMMWk. .xWMMMMMMMMMMMMMMMMMMMMK, ;KMMMMMMMMMMMMMWk' .;kNMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMNo. .dWMMMMMMMMMMMMMMMMMMMMMMMMMMMMNKx. .dNMMMMMMMMMMMMMMMMMMWx. .kMMMMMMMMMMMMNd. .oNMMM //
// MMMMMMMMMMMMMMMMMMMWX0kd:. .:dO0XWMMMMMMMMMMMMMMMMMMMMMXx;.. .;xXMMMMMMMMMMMMMMMWk' ,OWMMMMMMMMMMk. ;KMMM //
// MMMMMMMMMMMMMMMMNOl;.. ..;lONMMMMMMMMMMMMMMMMWk;. .;kWMMMMMMMMMMMMNd. 'xNMMMMMMMMMO' .oNMMM //
// MMMMMMMMMMMMMMMWx. .xWMMMMMMMMMMMMMMMNo.. .oNMMMMMMMMMMMNo. .dWMMMMMMMMW0o,.. .,xNMMMM //
// MMMMMMMMMMMMMMMMXOdllllllllllllllllllllllllooodddxxk0NMMMMMMMMMMMMMMMMMWKOkkkxxddoooollllldkKNMMMMMMMMMMMMWOollllllllloOWMMMMMMMMMMMNX0kxdlloxONMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM //
// NXXXXXXXXXXXXXXXXXXXXXXXXXNMMWNXXXXXXXXXXXXXXXXXXXXXXXXXXXXNWMMMMMMMWNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXNNWMMMMMMMMMMWNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXNW //
// ,'''''''''''''''''''''''''lXWx,''''''''''''''''''''''''''''':kNMMXxc,'''''''''''''''''''''''''''''''''''',cdKWMMMMNkl;'''''''''''''''''''''''''''''',k //
// . :XWo. 'OWO;. 'xWMW0;. .d //
// . ...............cXWo. ........... .kK; ....................... '0MK; .............................x //
// . .l00K00KKKKKKKKKKXWWo. c0KKKKKKKKK0d. .k0' :xO0KKKKKKKKKKKKKKKKKKK00l. .kM0' ;OKKK0KKKKKKKKKKKKKKKKKKKKKK0KN //
// . .;dxxxxxxxxxxxxxx0WWo. ;dxxxxxxxxxxc. .k0' ,loxxxxxxxxxxxxxxxxxxxxxd;. .kM0' cNMNOxxxxxxxxxxxxxxxxxxxxxxxxkK //
// . :XWo. .k0' .kM0' cNMO' .d //
// . ;XWo. .cK0' .kM0' cNMO' .d //
// . ;XWo. .;dxxxx0NM0' .kM0' cNMO' .d //
// . ;XWo. 'OWMMMMMM0' .kM0' cNMO' .d //
// . ;XWo. 'kWMMMMM0' .kM0' cNMO' .d //
// . ;XWo. .xNMMMM0' .kM0' cNMO' .d //
// . ;XWo. ,, .dNMMM0' .kM0' cNMKo;::;;:;'. .d //
// . ;XWo. .o0c. .lXMM0' .kM0' cNMWWWWWWWWWO, .d //
// . :XWo. .oWXl. .cXM0' .kM0' .;::::::::::,. .d //
// . ,xkkkkkkkkkkkkk0WWo. .oWMXo. .:K0, .OM0' .x //
// . cNMMMMMMMMMMMMMMMWo. .oWMMNd. ;Od. .oNM0' .cX //
// . .lNMMMMMMMMMMMMMMMWd. .dWMMMWx. .;OOc'. ..:kNMM0, ...:xNM //
// OkkkkkkkkkOKWMMMMMMMMMMMMMMMMXOkkkkkOXMMMMMWKkkkkkkkkkkkkkkkkkkOXMWX0OkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkO0XWMMMMN0kkkkOkkkkkkkkkkkkkkkkkkkkkkkOO0XWMMM //
// dddddkXMMMMMMMMMMMMMMMMMMW0xddddddddddddddddddddddddddddddddddddddONMMXkdddddddddddddddddd0WMMNkdddddd0WWOdddddddddddddddddddddddddddddddddddddddxOXWM //
// . .kMMMMMMMMMMMMMMMMMNo. .:KMO' .xNM0' lWX: .'l0 //
// . .kMMMMMMMMMMMMMMMMMK; .kMO' .oX0' lNX: ' //
// . .kMMMMMMMMMMMMMMMMMK; .:ccccccccccccccccccc,. .kMO' .co' lNX: ,ccccccccccccccccccccc,. //
// . .kMMMMMMMMMMMMMMMMMK; .lXWWWWWWWWWWWWWWWWWWNk' .kMO' . lNX: .xNWWWWWWWWWWWWWWWWWWWNk' //
// . .;ooooooooooooood0MK; .',,,,,,,,,,,,,,,,,,,. .kMO' lNX: .,,,,,,,,,,,,,,,,,,;,,. //
// . .dWK; .kMO' lNX: //
// . .dWK; .kMO' lNX: //
// . .dWK; .kMO' lNX: //
// . .dWK; .kMO' lNX: //
// . .dWK; .kMO' lNX: //
// . .dWK; .kMO' lNX: //
// . .dWK; .kMO' .. lNX: //
// . .dWK; .kMO' 'xc. lNX: //
// . .dWK; .';;;;;;;;;;;;;;;;;,. .kMO' ,0No. lNX: //
// . .dWK; 'kWWWWWWWWWWWWWWWWWK: .kMO' ,0MNd. lNX: . //
// . .dWK; 'OMMMMMMMMMMMMMMMMMX: .kMO' ,0MMWk' lNX: 'x //
// . .dWK; 'OMMMMMMMMMMMMMMMMMX: .kMO' ,0MMMWx. lNX: .c0W //
// //
// //
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
contract HHF is ERC721Creator {
constructor() ERC721Creator("Hoppy Holiday Frogs!", "HHF") {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/// @author: manifold.xyz
import "@openzeppelin/contracts/proxy/Proxy.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/StorageSlot.sol";
contract ERC721Creator is Proxy {
constructor(string memory name, string memory symbol) {
assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = 0x2d3fC875de7Fe7Da43AD0afa0E7023c9B91D06b1;
Address.functionDelegateCall(
0x2d3fC875de7Fe7Da43AD0afa0E7023c9B91D06b1,
abi.encodeWithSignature("initialize(string,string)", name, symbol)
);
}
/**
* @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 address.
*/
function implementation() public view returns (address) {
return _implementation();
}
function _implementation() internal override view returns (address) {
return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
* @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
* instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
* be specified by overriding the virtual {_implementation} function.
*
* Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
* different contract through the {_delegate} function.
*
* The success and return data of the delegated call will be returned back to the caller of the proxy.
*/
abstract contract Proxy {
/**
* @dev Delegates the current call to `implementation`.
*
* This function does not return to its internal call site, it will return directly to the external caller.
*/
function _delegate(address implementation) internal virtual {
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 This is a virtual function that should be overridden so it returns the address to which the fallback function
* and {_fallback} should delegate.
*/
function _implementation() internal view virtual returns (address);
/**
* @dev Delegates the current call to the address returned by `_implementation()`.
*
* This function does not return to its internal call site, it will return directly to the external caller.
*/
function _fallback() internal virtual {
_beforeFallback();
_delegate(_implementation());
}
/**
* @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
* function in the contract matches the call data.
*/
fallback() external payable virtual {
_fallback();
}
/**
* @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
* is empty.
*/
receive() external payable virtual {
_fallback();
}
/**
* @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
* call, or as part of the Solidity `fallback` or `receive` functions.
*
* If overridden should call `super._beforeFallback()`.
*/
function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or 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 {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
* @dev Library for reading and writing primitive types to specific storage slots.
*
* Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
* This library helps with reading and writing to such slots without the need for inline assembly.
*
* The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
*
* Example usage to set ERC1967 implementation slot:
* ```
* contract ERC1967 {
* bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
*
* function _getImplementation() internal view returns (address) {
* return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
* }
*
* function _setImplementation(address newImplementation) internal {
* require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
* StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
* }
* }
* ```
*
* _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
*/
library StorageSlot {
struct AddressSlot {
address value;
}
struct BooleanSlot {
bool value;
}
struct Bytes32Slot {
bytes32 value;
}
struct Uint256Slot {
uint256 value;
}
/**
* @dev Returns an `AddressSlot` with member `value` located at `slot`.
*/
function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `BooleanSlot` with member `value` located at `slot`.
*/
function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
*/
function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `Uint256Slot` with member `value` located at `slot`.
*/
function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
}