Contract Source Code:
// 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
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Multicall.sol)
pragma solidity ^0.8.0;
import "./Address.sol";
/**
* @dev Provides a function to batch together multiple calls in a single external call.
*
* _Available since v4.1._
*/
abstract contract Multicall {
/**
* @dev Receives and executes a batch of function calls on this contract.
*/
function multicall(bytes[] calldata data) external virtual returns (bytes[] memory results) {
results = new bytes[](data.length);
for (uint256 i = 0; i < data.length; i++) {
results[i] = Address.functionDelegateCall(address(this), data[i]);
}
return results;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
import "./IERC173Events.sol";
/**
* @title Contract ownership standard interface
* @dev see https://eips.ethereum.org/EIPS/eip-173
*/
interface IERC173 is IERC173Events {
/**
* @notice get the ERC173 contract owner
* @return conrtact owner
*/
function owner() external view returns (address);
/**
* @notice transfer contract ownership to new account
* @param account address of new owner
*/
function transferOwnership(address account) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
/**
* @title Contract ownership standard interface (event only)
* @dev see https://eips.ethereum.org/EIPS/eip-173
*/
interface IERC173Events {
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
library OwnableStorage {
struct Layout {
address owner;
}
bytes32 internal constant STORAGE_SLOT = keccak256("openzeppelin.contracts.storage.Ownable");
function layout() internal pure returns (Layout storage l) {
bytes32 slot = STORAGE_SLOT;
assembly {
l.slot := slot
}
}
function setOwner(Layout storage l, address owner) internal {
l.owner = owner;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
import "../access/ownable/OwnableStorage.sol";
import "../access/ownable/IERC173.sol";
import "../introspection/ERC165.sol";
import "../metatx/ERC2771Context.sol";
import "../diamond/IDiamondCut.sol";
import "../diamond/IDiamondLoupe.sol";
import "@openzeppelin/contracts/utils/Multicall.sol";
import "./DiamondStorage.sol";
contract Diamond is Multicall {
using ERC165Storage for ERC165Storage.Layout;
using OwnableStorage for OwnableStorage.Layout;
struct Initialization {
address initContract;
bytes initData;
}
struct CoreFacets {
address diamondCutFacet;
address diamondLoupeFacet;
address erc165Facet;
address erc173Facet;
}
constructor(
address owner,
CoreFacets memory _coreFacets,
IDiamondCut.FacetCut[] memory _facets,
Initialization[] memory _initializations
) {
ERC165Storage.Layout storage erc165 = ERC165Storage.layout();
// register DiamondCut
bytes4[] memory selectorsDiamondCut = new bytes4[](1);
selectorsDiamondCut[0] = IDiamondCut.diamondCut.selector;
erc165.setSupportedInterface(type(IDiamondCut).interfaceId, true);
// register DiamondLoupe
bytes4[] memory selectorsDiamondLoupe = new bytes4[](4);
selectorsDiamondLoupe[0] = IDiamondLoupe.facets.selector;
selectorsDiamondLoupe[1] = IDiamondLoupe.facetFunctionSelectors.selector;
selectorsDiamondLoupe[2] = IDiamondLoupe.facetAddresses.selector;
selectorsDiamondLoupe[3] = IDiamondLoupe.facetAddress.selector;
erc165.setSupportedInterface(type(IDiamondLoupe).interfaceId, true);
// register ERC165 (supportsInterface)
bytes4[] memory selectorsERC165 = new bytes4[](1);
selectorsERC165[0] = IERC165.supportsInterface.selector;
erc165.setSupportedInterface(type(IERC165).interfaceId, true);
// register ERC173 (Ownable)
bytes4[] memory selectorsERC173 = new bytes4[](2);
selectorsERC173[0] = IERC173.owner.selector;
selectorsERC173[1] = IERC173.transferOwnership.selector;
erc165.setSupportedInterface(type(IERC173).interfaceId, true);
// execute the first ever diamond cut,
// we are calling the addFunctions directly to save ~ %50 gas
DiamondStorage.addFunctions(_coreFacets.diamondCutFacet, selectorsDiamondCut);
DiamondStorage.addFunctions(_coreFacets.diamondLoupeFacet, selectorsDiamondLoupe);
DiamondStorage.addFunctions(_coreFacets.erc165Facet, selectorsERC165);
DiamondStorage.addFunctions(_coreFacets.erc173Facet, selectorsERC173);
// set owner
OwnableStorage.layout().setOwner(owner);
// initialization
for (uint256 i = 0; i < _facets.length; i++) {
DiamondStorage.addFunctions(_facets[i].facetAddress, _facets[i].functionSelectors);
}
for (uint256 i = 0; i < _initializations.length; i++) {
DiamondStorage.initializeDiamondCut(_initializations[i].initContract, _initializations[i].initData);
}
}
// Find facet for function that is called and execute the
// function if a facet is found and return any value.
fallback() external payable {
DiamondStorage.Layout storage l;
bytes32 position = DiamondStorage.DIAMOND_STORAGE_POSITION;
// get diamond storage
assembly {
l.slot := position
}
// get facet from function selector
address facet = l.selectorToFacetAndPosition[msg.sig].facetAddress;
require(facet != address(0), "BAD_FUNC");
// Execute external function from facet using delegatecall and return any value.
assembly {
// copy function selector and any arguments
calldatacopy(0, 0, calldatasize())
// execute function call using the facet
let result := delegatecall(gas(), facet, 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: MIT
pragma solidity ^0.8.15;
/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
import "../diamond/IDiamondCut.sol";
// Remember to add the loupe functions from DiamondLoupeFacet to the diamond.
// The loupe functions are required by the EIP2535 Diamonds standard
error ErrDiamondFacetAlreadyExists(address facet, bytes4 selector);
error ErrDiamondFacetSameFunction(address facet, bytes4 selector);
library DiamondStorage {
bytes32 constant DIAMOND_STORAGE_POSITION = keccak256("diamond.standard.diamond.storage");
struct FacetAddressAndPosition {
address facetAddress;
uint96 functionSelectorPosition; // position in facetFunctionSelectors.functionSelectors array
}
struct FacetFunctionSelectors {
bytes4[] functionSelectors;
uint256 facetAddressPosition; // position of facetAddress in facetAddresses array
}
struct Layout {
// maps function selector to the facet address and
// the position of the selector in the facetFunctionSelectors.selectors array
mapping(bytes4 => FacetAddressAndPosition) selectorToFacetAndPosition;
// maps facet addresses to function selectors
mapping(address => FacetFunctionSelectors) facetFunctionSelectors;
// facet addresses
address[] facetAddresses;
}
function layout() internal pure returns (Layout storage l) {
bytes32 position = DIAMOND_STORAGE_POSITION;
assembly {
l.slot := position
}
}
event DiamondCut(IDiamondCut.FacetCut[] _diamondCut, address _init, bytes _calldata);
// Internal function version of diamondCut
function diamondCut(
IDiamondCut.FacetCut[] memory _diamondCut,
address _init,
bytes memory _calldata
) internal {
for (uint256 facetIndex; facetIndex < _diamondCut.length; facetIndex++) {
IDiamondCut.FacetCutAction action = _diamondCut[facetIndex].action;
if (action == IDiamondCut.FacetCutAction.Add) {
addFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
} else if (action == IDiamondCut.FacetCutAction.Replace) {
replaceFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
} else if (action == IDiamondCut.FacetCutAction.Remove) {
removeFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
} else {
revert("LibDiamondCut: Incorrect FacetCutAction");
}
}
emit DiamondCut(_diamondCut, _init, _calldata);
initializeDiamondCut(_init, _calldata);
}
function addFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
// require(
// _functionSelectors.length > 0,
// "LibDiamondCut: No selectors in facet to cut"
// );
Layout storage l = layout();
// require(
// _facetAddress != address(0),
// "LibDiamondCut: Add facet can't be address(0)"
// );
uint96 selectorPosition = uint96(l.facetFunctionSelectors[_facetAddress].functionSelectors.length);
// add new facet address if it does not exist
if (selectorPosition == 0) {
addFacet(l, _facetAddress);
}
for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldFacetAddress = l.selectorToFacetAndPosition[selector].facetAddress;
if (oldFacetAddress != address(0)) {
revert ErrDiamondFacetAlreadyExists(oldFacetAddress, selector);
}
addFunction(l, selector, selectorPosition, _facetAddress);
selectorPosition++;
}
}
function replaceFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
// require(
// _functionSelectors.length > 0,
// "LibDiamondCut: No selectors in facet to cut"
// );
Layout storage l = layout();
// require(
// _facetAddress != address(0),
// "LibDiamondCut: Add facet can't be address(0)"
// );
uint96 selectorPosition = uint96(l.facetFunctionSelectors[_facetAddress].functionSelectors.length);
// add new facet address if it does not exist
if (selectorPosition == 0) {
addFacet(l, _facetAddress);
}
for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldFacetAddress = l.selectorToFacetAndPosition[selector].facetAddress;
if (oldFacetAddress == _facetAddress) {
revert ErrDiamondFacetSameFunction(oldFacetAddress, selector);
}
removeFunction(l, oldFacetAddress, selector);
addFunction(l, selector, selectorPosition, _facetAddress);
selectorPosition++;
}
}
function removeFunctions(address, bytes4[] memory _functionSelectors) internal {
// require(
// _functionSelectors.length > 0,
// "LibDiamondCut: No selectors in facet to cut"
// );
Layout storage l = layout();
// if function does not exist then do nothing and return
// require(
// _facetAddress == address(0),
// "LibDiamondCut: Remove facet address must be address(0)"
// );
for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
bytes4 selector = _functionSelectors[selectorIndex];
address oldFacetAddress = l.selectorToFacetAndPosition[selector].facetAddress;
removeFunction(l, oldFacetAddress, selector);
}
}
function addFacet(Layout storage l, address _facetAddress) internal {
enforceHasContractCode(_facetAddress, "LibDiamondCut: New facet has no code");
l.facetFunctionSelectors[_facetAddress].facetAddressPosition = l.facetAddresses.length;
l.facetAddresses.push(_facetAddress);
}
function addFunction(
Layout storage l,
bytes4 _selector,
uint96 _selectorPosition,
address _facetAddress
) internal {
l.selectorToFacetAndPosition[_selector].functionSelectorPosition = _selectorPosition;
l.facetFunctionSelectors[_facetAddress].functionSelectors.push(_selector);
l.selectorToFacetAndPosition[_selector].facetAddress = _facetAddress;
}
function removeFunction(
Layout storage l,
address _facetAddress,
bytes4 _selector
) internal {
// require(
// _facetAddress != address(0),
// "LibDiamondCut: Can't remove function that doesn't exist"
// );
// an immutable function is a function defined directly in a diamond
// require(
// _facetAddress != address(this),
// "LibDiamondCut: Can't remove immutable function"
// );
// replace selector with last selector, then delete last selector
uint256 selectorPosition = l.selectorToFacetAndPosition[_selector].functionSelectorPosition;
uint256 lastSelectorPosition = l.facetFunctionSelectors[_facetAddress].functionSelectors.length - 1;
// if not the same then replace _selector with lastSelector
if (selectorPosition != lastSelectorPosition) {
bytes4 lastSelector = l.facetFunctionSelectors[_facetAddress].functionSelectors[lastSelectorPosition];
l.facetFunctionSelectors[_facetAddress].functionSelectors[selectorPosition] = lastSelector;
l.selectorToFacetAndPosition[lastSelector].functionSelectorPosition = uint96(selectorPosition);
}
// delete the last selector
l.facetFunctionSelectors[_facetAddress].functionSelectors.pop();
delete l.selectorToFacetAndPosition[_selector];
// if no more selectors for facet address then delete the facet address
if (lastSelectorPosition == 0) {
// replace facet address with last facet address and delete last facet address
uint256 lastFacetAddressPosition = l.facetAddresses.length - 1;
uint256 facetAddressPosition = l.facetFunctionSelectors[_facetAddress].facetAddressPosition;
if (facetAddressPosition != lastFacetAddressPosition) {
address lastFacetAddress = l.facetAddresses[lastFacetAddressPosition];
l.facetAddresses[facetAddressPosition] = lastFacetAddress;
l.facetFunctionSelectors[lastFacetAddress].facetAddressPosition = facetAddressPosition;
}
l.facetAddresses.pop();
delete l.facetFunctionSelectors[_facetAddress].facetAddressPosition;
}
}
function initializeDiamondCut(address _init, bytes memory _calldata) internal {
if (_init == address(0)) {
require(_calldata.length == 0, "LibDiamondCut: _init is address(0) but_calldata is not empty");
} else {
require(_calldata.length > 0, "LibDiamondCut: _calldata is empty but _init is not address(0)");
if (_init != address(this)) {
enforceHasContractCode(_init, "LibDiamondCut: _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("LibDiamondCut: _init function reverted");
}
}
}
}
function enforceHasContractCode(address _contract, string memory _errorMessage) internal view {
uint256 contractSize;
assembly {
contractSize := extcodesize(_contract)
}
require(contractSize > 0, _errorMessage);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
interface IDiamondCut {
enum FacetCutAction {
Add,
Replace,
Remove
}
// Add=0, Replace=1, Remove=2
struct FacetCut {
address facetAddress;
FacetCutAction action;
bytes4[] functionSelectors;
}
/// @notice Add/replace/remove any number of functions and optionally execute
/// a function with delegatecall
/// @param _diamondCut Contains the facet addresses and function selectors
/// @param _init The address of the contract or facet to execute _calldata
/// @param _calldata A function call, including function selector and arguments
/// _calldata is executed with delegatecall on _init
function diamondCut(
FacetCut[] calldata _diamondCut,
address _init,
bytes calldata _calldata
) external;
event DiamondCut(FacetCut[] _diamondCut, address _init, bytes _calldata);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
// A loupe is a small magnifying glass used to look at diamonds.
// These functions look at diamonds
interface IDiamondLoupe {
/// These functions are expected to be called frequently
/// by tools.
struct Facet {
address facetAddress;
bytes4[] functionSelectors;
}
/// @notice Gets all facet addresses and their four byte function selectors.
/// @return facets_ Facet
function facets() external view returns (Facet[] memory facets_);
/// @notice Gets all the function selectors supported by a specific facet.
/// @param _facet The facet address.
/// @return facetFunctionSelectors_
function facetFunctionSelectors(address _facet) external view returns (bytes4[] memory facetFunctionSelectors_);
/// @notice Get all the facet addresses used by a diamond.
/// @return facetAddresses_
function facetAddresses() external view returns (address[] memory facetAddresses_);
/// @notice Gets the facet that supports the given selector.
/// @dev If facet is not found return address(0).
/// @param _functionSelector The function selector.
/// @return facetAddress_ The facet address.
function facetAddress(bytes4 _functionSelector) external view returns (address facetAddress_);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "./ERC165Storage.sol";
/**
* @title ERC165
* @notice Standard EIP-165 facet which would be already included as a core facet in Flair's Diamond contract.
*
* @custom:type eip-2535-facet
* @custom:category Introspection
* @custom:provides-interfaces IERC165
*/
contract ERC165 is IERC165 {
using ERC165Storage for ERC165Storage.Layout;
/**
* @inheritdoc IERC165
*/
function supportsInterface(bytes4 interfaceId) public view returns (bool) {
return ERC165Storage.layout().isSupportedInterface(interfaceId);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
library ERC165Storage {
struct Layout {
mapping(bytes4 => bool) supportedInterfaces;
}
bytes32 internal constant STORAGE_SLOT = keccak256("openzeppelin.contracts.storage.ERC165");
function layout() internal pure returns (Layout storage l) {
bytes32 slot = STORAGE_SLOT;
assembly {
l.slot := slot
}
}
function isSupportedInterface(Layout storage l, bytes4 interfaceId) internal view returns (bool) {
return l.supportedInterfaces[interfaceId];
}
function setSupportedInterface(
Layout storage l,
bytes4 interfaceId,
bool status
) internal {
require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
l.supportedInterfaces[interfaceId] = status;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
import "./ERC2771ContextStorage.sol";
import "./ERC2771ContextInternal.sol";
import "./IERC2771Context.sol";
/**
* @title ERC2771 Context
* @notice Provides view functions about configured trusted forwarder according to EIP-2771.
*
* @custom:type eip-2535-facet
* @custom:category Meta Transactions
* @custom:provides-interfaces IERC2771Context
*/
contract ERC2771Context is IERC2771Context, ERC2771ContextInternal {
using ERC2771ContextStorage for ERC2771ContextStorage.Layout;
function trustedForwarder() external view override returns (address) {
return ERC2771ContextStorage.layout().trustedForwarder;
}
function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
return _isTrustedForwarder(forwarder);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
import "@openzeppelin/contracts/utils/Context.sol";
import "./ERC2771ContextStorage.sol";
abstract contract ERC2771ContextInternal is Context {
function _isTrustedForwarder(address operator) internal view returns (bool) {
return ERC2771ContextStorage.layout().trustedForwarder == operator;
}
function _msgSender() internal view virtual override returns (address sender) {
if (_isTrustedForwarder(msg.sender)) {
// The assembly code is more direct than the Solidity version using `abi.decode`.
/// @solidity memory-safe-assembly
assembly {
sender := shr(96, calldataload(sub(calldatasize(), 20)))
}
} else {
return super._msgSender();
}
}
function _msgData() internal view virtual override returns (bytes calldata) {
if (_isTrustedForwarder(msg.sender)) {
return msg.data[:msg.data.length - 20];
} else {
return super._msgData();
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
library ERC2771ContextStorage {
struct Layout {
address trustedForwarder;
}
bytes32 internal constant STORAGE_SLOT = keccak256("openzeppelin.contracts.storage.ERC2771Context");
function layout() internal pure returns (Layout storage l) {
bytes32 slot = STORAGE_SLOT;
assembly {
l.slot := slot
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
interface IERC2771Context {
function trustedForwarder() external view returns (address);
function isTrustedForwarder(address forwarder) external view returns (bool);
}