404Blocks

// File: https://github.com/Vectorized/solady/blob/main/src/auth/Ownable.sol


pragma solidity ^0.8.4;

/// @notice Simple single owner authorization mixin.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol)
///
/// @dev Note:
/// This implementation does NOT auto-initialize the owner to `msg.sender`.
/// You MUST call the `_initializeOwner` in the constructor / initializer.
///
/// While the ownable portion follows
/// [EIP-173](https://eips.ethereum.org/EIPS/eip-173) for compatibility,
/// the nomenclature for the 2-step ownership handover may be unique to this codebase.
abstract contract Ownable {
	/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
	/*                       CUSTOM ERRORS                        */
	/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

	/// @dev The caller is not authorized to call the function.
	error Unauthorized();

	/// @dev The `newOwner` cannot be the zero address.
	error NewOwnerIsZeroAddress();

	/// @dev The `pendingOwner` does not have a valid handover request.
	error NoHandoverRequest();

	/// @dev Cannot double-initialize.
	error AlreadyInitialized();

	/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
	/*                           EVENTS                           */
	/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

	/// @dev The ownership is transferred from `oldOwner` to `newOwner`.
	/// This event is intentionally kept the same as OpenZeppelin's Ownable to be
	/// compatible with indexers and [EIP-173](https://eips.ethereum.org/EIPS/eip-173),
	/// despite it not being as lightweight as a single argument event.
	event OwnershipTransferred(address indexed oldOwner, address indexed newOwner);

	/// @dev An ownership handover to `pendingOwner` has been requested.
	event OwnershipHandoverRequested(address indexed pendingOwner);

	/// @dev The ownership handover to `pendingOwner` has been canceled.
	event OwnershipHandoverCanceled(address indexed pendingOwner);

	/// @dev `keccak256(bytes("OwnershipTransferred(address,address)"))`.
	uint256 private constant _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE =
		0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0;

	/// @dev `keccak256(bytes("OwnershipHandoverRequested(address)"))`.
	uint256 private constant _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE =
		0xdbf36a107da19e49527a7176a1babf963b4b0ff8cde35ee35d6cd8f1f9ac7e1d;

	/// @dev `keccak256(bytes("OwnershipHandoverCanceled(address)"))`.
	uint256 private constant _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE =
		0xfa7b8eab7da67f412cc9575ed43464468f9bfbae89d1675917346ca6d8fe3c92;

	/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
	/*                          STORAGE                           */
	/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

	/// @dev The owner slot is given by:
	/// `bytes32(~uint256(uint32(bytes4(keccak256("_OWNER_SLOT_NOT")))))`.
	/// It is intentionally chosen to be a high value
	/// to avoid collision with lower slots.
	/// The choice of manual storage layout is to enable compatibility
	/// with both regular and upgradeable contracts.
	bytes32 internal constant _OWNER_SLOT =
		0xffffffffffffffffffffffffffffffffffffffffffffffffffffffff74873927;

	/// The ownership handover slot of `newOwner` is given by:
	/// ```
	///     mstore(0x00, or(shl(96, user), _HANDOVER_SLOT_SEED))
	///     let handoverSlot := keccak256(0x00, 0x20)
	/// ```
	/// It stores the expiry timestamp of the two-step ownership handover.
	uint256 private constant _HANDOVER_SLOT_SEED = 0x389a75e1;

	/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
	/*                     INTERNAL FUNCTIONS                     */
	/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

	/// @dev Override to return true to make `_initializeOwner` prevent double-initialization.
	function _guardInitializeOwner() internal pure virtual returns (bool guard) {}

	/// @dev Initializes the owner directly without authorization guard.
	/// This function must be called upon initialization,
	/// regardless of whether the contract is upgradeable or not.
	/// This is to enable generalization to both regular and upgradeable contracts,
	/// and to save gas in case the initial owner is not the caller.
	/// For performance reasons, this function will not check if there
	/// is an existing owner.
	function _initializeOwner(address newOwner) internal virtual {
		if (_guardInitializeOwner()) {
			/// @solidity memory-safe-assembly
			assembly {
				let ownerSlot := _OWNER_SLOT
				if sload(ownerSlot) {
					mstore(0x00, 0x0dc149f0) // `AlreadyInitialized()`.
					revert(0x1c, 0x04)
				}
				// Clean the upper 96 bits.
				newOwner := shr(96, shl(96, newOwner))
				// Store the new value.
				sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
				// Emit the {OwnershipTransferred} event.
				log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
			}
		} else {
			/// @solidity memory-safe-assembly
			assembly {
				// Clean the upper 96 bits.
				newOwner := shr(96, shl(96, newOwner))
				// Store the new value.
				sstore(_OWNER_SLOT, newOwner)
				// Emit the {OwnershipTransferred} event.
				log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
			}
		}
	}

	/// @dev Sets the owner directly without authorization guard.
	function _setOwner(address newOwner) internal virtual {
		if (_guardInitializeOwner()) {
			/// @solidity memory-safe-assembly
			assembly {
				let ownerSlot := _OWNER_SLOT
				// Clean the upper 96 bits.
				newOwner := shr(96, shl(96, newOwner))
				// Emit the {OwnershipTransferred} event.
				log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
				// Store the new value.
				sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
			}
		} else {
			/// @solidity memory-safe-assembly
			assembly {
				let ownerSlot := _OWNER_SLOT
				// Clean the upper 96 bits.
				newOwner := shr(96, shl(96, newOwner))
				// Emit the {OwnershipTransferred} event.
				log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
				// Store the new value.
				sstore(ownerSlot, newOwner)
			}
		}
	}

	/// @dev Throws if the sender is not the owner.
	function _checkOwner() internal view virtual {
		/// @solidity memory-safe-assembly
		assembly {
			// If the caller is not the stored owner, revert.
			if iszero(eq(caller(), sload(_OWNER_SLOT))) {
				mstore(0x00, 0x82b42900) // `Unauthorized()`.
				revert(0x1c, 0x04)
			}
		}
	}

	/// @dev Returns how long a two-step ownership handover is valid for in seconds.
	/// Override to return a different value if needed.
	/// Made internal to conserve bytecode. Wrap it in a public function if needed.
	function _ownershipHandoverValidFor() internal view virtual returns (uint64) {
		return 48 * 3600;
	}

	/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
	/*                  PUBLIC UPDATE FUNCTIONS                   */
	/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

	/// @dev Allows the owner to transfer the ownership to `newOwner`.
	function transferOwnership(address newOwner) public payable virtual onlyOwner {
		/// @solidity memory-safe-assembly
		assembly {
			if iszero(shl(96, newOwner)) {
				mstore(0x00, 0x7448fbae) // `NewOwnerIsZeroAddress()`.
				revert(0x1c, 0x04)
			}
		}
		_setOwner(newOwner);
	}

	/// @dev Allows the owner to renounce their ownership.
	function renounceOwnership() public payable virtual onlyOwner {
		_setOwner(address(0));
	}

	/// @dev Request a two-step ownership handover to the caller.
	/// The request will automatically expire in 48 hours (172800 seconds) by default.
	function requestOwnershipHandover() public payable virtual {
		unchecked {
			uint256 expires = block.timestamp + _ownershipHandoverValidFor();
			/// @solidity memory-safe-assembly
			assembly {
				// Compute and set the handover slot to `expires`.
				mstore(0x0c, _HANDOVER_SLOT_SEED)
				mstore(0x00, caller())
				sstore(keccak256(0x0c, 0x20), expires)
				// Emit the {OwnershipHandoverRequested} event.
				log2(0, 0, _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE, caller())
			}
		}
	}

	/// @dev Cancels the two-step ownership handover to the caller, if any.
	function cancelOwnershipHandover() public payable virtual {
		/// @solidity memory-safe-assembly
		assembly {
			// Compute and set the handover slot to 0.
			mstore(0x0c, _HANDOVER_SLOT_SEED)
			mstore(0x00, caller())
			sstore(keccak256(0x0c, 0x20), 0)
			// Emit the {OwnershipHandoverCanceled} event.
			log2(0, 0, _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE, caller())
		}
	}

	/// @dev Allows the owner to complete the two-step ownership handover to `pendingOwner`.
	/// Reverts if there is no existing ownership handover requested by `pendingOwner`.
	function completeOwnershipHandover(address pendingOwner) public payable virtual onlyOwner {
		/// @solidity memory-safe-assembly
		assembly {
			// Compute and set the handover slot to 0.
			mstore(0x0c, _HANDOVER_SLOT_SEED)
			mstore(0x00, pendingOwner)
			let handoverSlot := keccak256(0x0c, 0x20)
			// If the handover does not exist, or has expired.
			if gt(timestamp(), sload(handoverSlot)) {
				mstore(0x00, 0x6f5e8818) // `NoHandoverRequest()`.
				revert(0x1c, 0x04)
			}
			// Set the handover slot to 0.
			sstore(handoverSlot, 0)
		}
		_setOwner(pendingOwner);
	}

	/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
	/*                   PUBLIC READ FUNCTIONS                    */
	/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

	/// @dev Returns the owner of the contract.
	function owner() public view virtual returns (address result) {
		/// @solidity memory-safe-assembly
		assembly {
			result := sload(_OWNER_SLOT)
		}
	}

	/// @dev Returns the expiry timestamp for the two-step ownership handover to `pendingOwner`.
	function ownershipHandoverExpiresAt(address pendingOwner)
		public
		view
		virtual
		returns (uint256 result)
	{
		/// @solidity memory-safe-assembly
		assembly {
			// Compute the handover slot.
			mstore(0x0c, _HANDOVER_SLOT_SEED)
			mstore(0x00, pendingOwner)
			// Load the handover slot.
			result := sload(keccak256(0x0c, 0x20))
		}
	}

	/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
	/*                         MODIFIERS                          */
	/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

	/// @dev Marks a function as only callable by the owner.
	modifier onlyOwner() virtual {
		_checkOwner();
		_;
	}
}

// File: https://github.com/Vectorized/dn404/blob/main/src/DN404Mirror.sol


pragma solidity ^0.8.4;

/// @title DN404Mirror
/// @notice DN404Mirror provides an interface for interacting with the
/// NFT tokens in a DN404 implementation.
///
/// @author vectorized.eth (@optimizoor)
/// @author Quit (@0xQuit)
/// @author Michael Amadi (@AmadiMichaels)
/// @author cygaar (@0xCygaar)
/// @author Thomas (@0xjustadev)
/// @author Harrison (@PopPunkOnChain)
///
/// @dev Note:
/// - The ERC721 data is stored in the base DN404 contract.
contract DN404Mirror is Ownable {
	/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
	/*                           EVENTS                           */
	/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/

	/// @dev Emitted when token `id` is transferred from `from` to `to`.
	event Transfer(address indexed from, address indexed to, uint256 indexed id);

	/// @dev Emitted when `owner` enables `account` to manage the `id` token.
	event Approval(address indexed owner, address indexed account, uint256 indexed id);

	/// @dev Emitted when `owner` enables or disables `operator` to manage all of their tokens.
	event ApprovalForAll(address indexed owner, address indexed operator, bool isApproved);

	/// @dev `keccak256(bytes("Transfer(address,address,uint256)"))`.
	uint256 private constant _TRANSFER_EVENT_SIGNATURE =
		0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;

	/// @dev `keccak256(bytes("Approval(address,address,uint256)"))`.
	uint256 private constant _APPROVAL_EVENT_SIGNATURE =
		0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925;

	/// @dev `keccak256(bytes("ApprovalForAll(address,address,bool)"))`.
	uint256 private constant _APPROVAL_FOR_ALL_EVENT_SIGNATURE =
		0x17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31;

	/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
	/*                        CUSTOM ERRORS                       */
	/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/

	/// @dev Thrown when a call for an NFT function did not originate
	/// from the base DN404 contract.
	error SenderNotBase();

	/// @dev Thrown when a call for an NFT function did not originate from the deployer.
	error SenderNotDeployer();

	/// @dev Thrown when transferring an NFT to a contract address that
	/// does not implement ERC721Receiver.
	error TransferToNonERC721ReceiverImplementer();

	/// @dev Thrown when linking to the DN404 base contract and the
	/// DN404 supportsInterface check fails or the call reverts.
	error CannotLink();

	/// @dev Thrown when a linkMirrorContract call is received and the
	/// NFT mirror contract has already been linked to a DN404 base contract.
	error AlreadyLinked();

	/// @dev Thrown when retrieving the base DN404 address when a link has not
	/// been established.
	error NotLinked();

	/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
	/*                          STORAGE                           */
	/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/

	/// @dev Struct contain the NFT mirror contract storage.
	struct DN404NFTStorage {
		address baseERC20;
		address deployer;
	}

	/// @dev Returns a storage pointer for DN404NFTStorage.
	function _getDN404NFTStorage() internal pure virtual returns (DN404NFTStorage storage $) {
		/// @solidity memory-safe-assembly
		assembly {
			// `uint72(bytes9(keccak256("DN404_MIRROR_STORAGE")))`.
			$.slot := 0x3602298b8c10b01230 // Truncate to 9 bytes to reduce bytecode size.
		}
	}

	/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
	/*                        CONSTRUCTOR                         */
	/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/

	constructor(address deployer) {
		// For non-proxies, we will store the deployer so that only the deployer can
		// link the base contract.
		_getDN404NFTStorage().deployer = deployer;
		_initializeOwner(deployer);
	}

	/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
	/*                     ERC721 OPERATIONS                      */
	/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/

	/// @dev Returns the token collection name from the base DN404 contract.
	function name() public view virtual returns (string memory result) {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			result := mload(0x40)
			mstore(0x00, 0x06fdde03) // `name()`.
			if iszero(staticcall(gas(), base, 0x1c, 0x04, 0x00, 0x00)) {
				returndatacopy(result, 0x00, returndatasize())
				revert(result, returndatasize())
			}
			returndatacopy(0x00, 0x00, 0x20)
			returndatacopy(result, mload(0x00), 0x20)
			returndatacopy(add(result, 0x20), add(mload(0x00), 0x20), mload(result))
			mstore(0x40, add(add(result, 0x20), mload(result)))
		}
	}

	/// @dev Returns the token collection symbol from the base DN404 contract.
	function symbol() public view virtual returns (string memory result) {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			result := mload(0x40)
			mstore(0x00, 0x95d89b41) // `symbol()`.
			if iszero(staticcall(gas(), base, 0x1c, 0x04, 0x00, 0x00)) {
				returndatacopy(result, 0x00, returndatasize())
				revert(result, returndatasize())
			}
			returndatacopy(0x00, 0x00, 0x20)
			returndatacopy(result, mload(0x00), 0x20)
			returndatacopy(add(result, 0x20), add(mload(0x00), 0x20), mload(result))
			mstore(0x40, add(add(result, 0x20), mload(result)))
		}
	}

	/// @dev Returns the Uniform Resource Identifier (URI) for token `id` from
	/// the base DN404 contract.
	function tokenURI(uint256 id) public view virtual returns (string memory result) {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			result := mload(0x40)
			mstore(0x20, id)
			mstore(0x00, 0xc87b56dd) // `tokenURI()`.
			if iszero(staticcall(gas(), base, 0x1c, 0x24, 0x00, 0x00)) {
				returndatacopy(result, 0x00, returndatasize())
				revert(result, returndatasize())
			}
			returndatacopy(0x00, 0x00, 0x20)
			returndatacopy(result, mload(0x00), 0x20)
			returndatacopy(add(result, 0x20), add(mload(0x00), 0x20), mload(result))
			mstore(0x40, add(add(result, 0x20), mload(result)))
		}
	}

	/// @dev Returns the total NFT supply from the base DN404 contract.
	function totalSupply() public view virtual returns (uint256 result) {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			mstore(0x00, 0xe2c79281) // `totalNFTSupply()`.
			if iszero(
				and(gt(returndatasize(), 0x1f), staticcall(gas(), base, 0x1c, 0x04, 0x00, 0x20))
			) {
				returndatacopy(mload(0x40), 0x00, returndatasize())
				revert(mload(0x40), returndatasize())
			}
			result := mload(0x00)
		}
	}

	/// @dev Returns the number of NFT tokens owned by `owner` from the base DN404 contract.
	///
	/// Requirements:
	/// - `owner` must not be the zero address.
	function balanceOf(address owner) public view virtual returns (uint256 result) {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			mstore(0x20, shr(96, shl(96, owner)))
			mstore(0x00, 0xf5b100ea) // `balanceOfNFT(address)`.
			if iszero(
				and(gt(returndatasize(), 0x1f), staticcall(gas(), base, 0x1c, 0x24, 0x00, 0x20))
			) {
				returndatacopy(mload(0x40), 0x00, returndatasize())
				revert(mload(0x40), returndatasize())
			}
			result := mload(0x00)
		}
	}

	/// @dev Returns the owner of token `id` from the base DN404 contract.
	///
	/// Requirements:
	/// - Token `id` must exist.
	function ownerOf(uint256 id) public view virtual returns (address result) {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			mstore(0x00, 0x6352211e) // `ownerOf(uint256)`.
			mstore(0x20, id)
			if iszero(
				and(gt(returndatasize(), 0x1f), staticcall(gas(), base, 0x1c, 0x24, 0x00, 0x20))
			) {
				returndatacopy(mload(0x40), 0x00, returndatasize())
				revert(mload(0x40), returndatasize())
			}
			result := shr(96, mload(0x0c))
		}
	}

	/// @dev Sets `spender` as the approved account to manage token `id` in
	/// the base DN404 contract.
	///
	/// Requirements:
	/// - Token `id` must exist.
	/// - The caller must be the owner of the token,
	///   or an approved operator for the token owner.
	///
	/// Emits an {Approval} event.
	function approve(address spender, uint256 id) public virtual {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			spender := shr(96, shl(96, spender))
			let m := mload(0x40)
			mstore(0x00, 0xd10b6e0c) // `approveNFT(address,uint256,address)`.
			mstore(0x20, spender)
			mstore(0x40, id)
			mstore(0x60, caller())
			if iszero(
				and(
					gt(returndatasize(), 0x1f),
					call(gas(), base, callvalue(), 0x1c, 0x64, 0x00, 0x20)
				)
			) {
				returndatacopy(m, 0x00, returndatasize())
				revert(m, returndatasize())
			}
			mstore(0x40, m) // Restore the free memory pointer.
			mstore(0x60, 0) // Restore the zero pointer.
			// Emit the {Approval} event.
			log4(codesize(), 0x00, _APPROVAL_EVENT_SIGNATURE, shr(96, mload(0x0c)), spender, id)
		}
	}

	/// @dev Returns the account approved to manage token `id` from
	/// the base DN404 contract.
	///
	/// Requirements:
	/// - Token `id` must exist.
	function getApproved(uint256 id) public view virtual returns (address result) {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			mstore(0x00, 0x081812fc) // `getApproved(uint256)`.
			mstore(0x20, id)
			if iszero(
				and(gt(returndatasize(), 0x1f), staticcall(gas(), base, 0x1c, 0x24, 0x00, 0x20))
			) {
				returndatacopy(mload(0x40), 0x00, returndatasize())
				revert(mload(0x40), returndatasize())
			}
			result := shr(96, mload(0x0c))
		}
	}

	/// @dev Sets whether `operator` is approved to manage the tokens of the caller in
	/// the base DN404 contract.
	///
	/// Emits an {ApprovalForAll} event.
	function setApprovalForAll(address operator, bool approved) public virtual {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			operator := shr(96, shl(96, operator))
			let m := mload(0x40)
			mstore(0x00, 0x813500fc) // `setApprovalForAll(address,bool,address)`.
			mstore(0x20, operator)
			mstore(0x40, iszero(iszero(approved)))
			mstore(0x60, caller())
			if iszero(
				and(eq(mload(0x00), 1), call(gas(), base, callvalue(), 0x1c, 0x64, 0x00, 0x20))
			) {
				returndatacopy(m, 0x00, returndatasize())
				revert(m, returndatasize())
			}
			// Emit the {ApprovalForAll} event.
			log3(0x40, 0x20, _APPROVAL_FOR_ALL_EVENT_SIGNATURE, caller(), operator)
			mstore(0x40, m) // Restore the free memory pointer.
			mstore(0x60, 0) // Restore the zero pointer.
		}
	}

	/// @dev Returns whether `operator` is approved to manage the tokens of `owner` from
	/// the base DN404 contract.
	function isApprovedForAll(address owner, address operator)
		public
		view
		virtual
		returns (bool result)
	{
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			let m := mload(0x40)
			mstore(0x40, operator)
			mstore(0x2c, shl(96, owner))
			mstore(0x0c, 0xe985e9c5000000000000000000000000) // `isApprovedForAll(address,address)`.
			if iszero(
				and(gt(returndatasize(), 0x1f), staticcall(gas(), base, 0x1c, 0x44, 0x00, 0x20))
			) {
				returndatacopy(m, 0x00, returndatasize())
				revert(m, returndatasize())
			}
			mstore(0x40, m) // Restore the free memory pointer.
			result := iszero(iszero(mload(0x00)))
		}
	}

	/// @dev Transfers token `id` from `from` to `to`.
	///
	/// Requirements:
	///
	/// - Token `id` must exist.
	/// - `from` must be the owner of the token.
	/// - `to` cannot be the zero address.
	/// - The caller must be the owner of the token, or be approved to manage the token.
	///
	/// Emits a {Transfer} event.
	function transferFrom(address from, address to, uint256 id) public virtual {
		address base = baseERC20();
		/// @solidity memory-safe-assembly
		assembly {
			from := shr(96, shl(96, from))
			to := shr(96, shl(96, to))
			let m := mload(0x40)
			mstore(m, 0xe5eb36c8) // `transferFromNFT(address,address,uint256,address)`.
			mstore(add(m, 0x20), from)
			mstore(add(m, 0x40), to)
			mstore(add(m, 0x60), id)
			mstore(add(m, 0x80), caller())
			if iszero(
				and(eq(mload(m), 1), call(gas(), base, callvalue(), add(m, 0x1c), 0x84, m, 0x20))
			) {
				returndatacopy(m, 0x00, returndatasize())
				revert(m, returndatasize())
			}
			// Emit the {Transfer} event.
			log4(codesize(), 0x00, _TRANSFER_EVENT_SIGNATURE, from, to, id)
		}
	}

	/// @dev Equivalent to `safeTransferFrom(from, to, id, "")`.
	function safeTransferFrom(address from, address to, uint256 id) public payable virtual {
		transferFrom(from, to, id);

		if (_hasCode(to)) _checkOnERC721Received(from, to, id, "");
	}

	/// @dev Transfers token `id` from `from` to `to`.
	///
	/// Requirements:
	///
	/// - Token `id` must exist.
	/// - `from` must be the owner of the token.
	/// - `to` cannot be the zero address.
	/// - The caller must be the owner of the token, or be approved to manage the token.
	/// - If `to` refers to a smart contract, it must implement
	///   {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
	///
	/// Emits a {Transfer} event.
	function safeTransferFrom(address from, address to, uint256 id, bytes calldata data)
		public
		virtual
	{
		transferFrom(from, to, id);

		if (_hasCode(to)) _checkOnERC721Received(from, to, id, data);
	}

	/// @dev Returns true if this contract implements the interface defined by `interfaceId`.
	/// See: https://eips.ethereum.org/EIPS/eip-165
	/// This function call must use less than 30000 gas.
	function supportsInterface(bytes4 interfaceId) public view virtual returns (bool result) {
		/// @solidity memory-safe-assembly
		assembly {
			let s := shr(224, interfaceId)
			// ERC165: 0x01ffc9a7, ERC721: 0x80ac58cd, ERC721Metadata: 0x5b5e139f.
			result := or(or(eq(s, 0x01ffc9a7), eq(s, 0x80ac58cd)), eq(s, 0x5b5e139f))
		}
	}

	/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
	/*                     MIRROR OPERATIONS                      */
	/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/

	/// @dev Returns the address of the base DN404 contract.
	function baseERC20() public view virtual returns (address base) {
		base = _getDN404NFTStorage().baseERC20;
		if (base == address(0)) revert NotLinked();
	}

	/// @dev Fallback modifier to execute calls from the base DN404 contract.
	modifier dn404NFTFallback() virtual {
		DN404NFTStorage storage $ = _getDN404NFTStorage();

		uint256 fnSelector = _calldataload(0x00) >> 224;

		// `logTransfer(uint256[])`.
		if (fnSelector == 0x263c69d6) {
			if (msg.sender != $.baseERC20) revert SenderNotBase();
			/// @solidity memory-safe-assembly
			assembly {
				// When returndatacopy copies 1 or more out-of-bounds bytes, it reverts.
				returndatacopy(0x00, returndatasize(), lt(calldatasize(), 0x20))
				let o := add(0x24, calldataload(0x04)) // Packed logs offset.
				returndatacopy(0x00, returndatasize(), lt(calldatasize(), o))
				let end := add(o, shl(5, calldataload(sub(o, 0x20))))
				returndatacopy(0x00, returndatasize(), lt(calldatasize(), end))

				for {} iszero(eq(o, end)) { o := add(0x20, o) } {
					let d := calldataload(o) // Entry in the packed logs.
					let a := shr(96, d) // The address.
					let b := and(1, d) // Whether it is a burn.
					log4(
						codesize(),
						0x00,
						_TRANSFER_EVENT_SIGNATURE,
						mul(a, b),
						mul(a, iszero(b)),
						shr(168, shl(160, d))
					)
				}
				mstore(0x00, 0x01)
				return(0x00, 0x20)
			}
		}
		// `linkMirrorContract(address)`.
		if (fnSelector == 0x0f4599e5) {
			if ($.deployer != address(0)) {
				if (address(uint160(_calldataload(0x04))) != $.deployer) {
					revert SenderNotDeployer();
				}
			}
			if ($.baseERC20 != address(0)) revert AlreadyLinked();
			$.baseERC20 = msg.sender;
			/// @solidity memory-safe-assembly
			assembly {
				mstore(0x00, 0x01)
				return(0x00, 0x20)
			}
		}
		_;
	}

	/// @dev Fallback function for calls from base DN404 contract.
	fallback() external payable virtual dn404NFTFallback {}

	receive() external payable virtual {}

	/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
	/*                      PRIVATE HELPERS                       */
	/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/

	/// @dev Returns the calldata value at `offset`.
	function _calldataload(uint256 offset) private pure returns (uint256 value) {
		/// @solidity memory-safe-assembly
		assembly {
			value := calldataload(offset)
		}
	}

	/// @dev Returns if `a` has bytecode of non-zero length.
	function _hasCode(address a) private view returns (bool result) {
		/// @solidity memory-safe-assembly
		assembly {
			result := extcodesize(a) // Can handle dirty upper bits.
		}
	}

	/// @dev Perform a call to invoke {IERC721Receiver-onERC721Received} on `to`.
	/// Reverts if the target does not support the function correctly.
	function _checkOnERC721Received(address from, address to, uint256 id, bytes memory data)
		private
	{
		/// @solidity memory-safe-assembly
		assembly {
			// Prepare the calldata.
			let m := mload(0x40)
			let onERC721ReceivedSelector := 0x150b7a02
			mstore(m, onERC721ReceivedSelector)
			mstore(add(m, 0x20), caller()) // The `operator`, which is always `msg.sender`.
			mstore(add(m, 0x40), shr(96, shl(96, from)))
			mstore(add(m, 0x60), id)
			mstore(add(m, 0x80), 0x80)
			let n := mload(data)
			mstore(add(m, 0xa0), n)
			if n { pop(staticcall(gas(), 4, add(data, 0x20), n, add(m, 0xc0), n)) }
			// Revert if the call reverts.
			if iszero(call(gas(), to, 0, add(m, 0x1c), add(n, 0xa4), m, 0x20)) {
				if returndatasize() {
					// Bubble up the revert if the call reverts.
					returndatacopy(m, 0x00, returndatasize())
					revert(m, returndatasize())
				}
			}
			// Load the returndata and compare it.
			if iszero(eq(mload(m), shl(224, onERC721ReceivedSelector))) {
				mstore(0x00, 0xd1a57ed6) // `TransferToNonERC721ReceiverImplementer()`.
				revert(0x1c, 0x04)
			}
		}
	}
}

{
  "compilationTarget": {
    "DN404Mirror.sol": "DN404Mirror"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}