Feature Tip: Add private address tag to any address under My Name Tag !
ERC-721
NFT
Overview
Max Total Supply
2,034 XDON
Holders
249
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
XDON
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.4; import "./@layerzerolabs/solidity-examples/contracts/token/onft/ONFT721.sol"; import {MerkleProof} from "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol"; // OZ: MerkleProof import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/Strings.sol"; contract XDON is ONFT721 { using Strings for uint256; uint public nextMintId; uint public maxMintId; uint public whitelistStartPeriod; uint public whitelistEndPeriod; bytes32 public immutable merkleRoot; mapping(address => uint) public userMints; uint public mintPrice; uint public publicMintLimit = 2; uint public whitelistedInitialLimit = 2; uint public whitelistedMintLimit; address public treasure; bool public mintHalted = false; string baseURI_; error InvalidMintStartId(); error InvalidMaxMint(); error MintPeriodNotStarted(); error MintPeriodEnded(); error InvalidMintDates(); error MaxMintReached(); error AlreadyClaimed(); error InvalidProof(); error SetMintPriceInvalid(); error SetTreasureInvalid(); error InvalidPaymentTransfer(); error MaxAllowedForPublic(); error PublicMintNotStarted(); error MaxAllowedForWhitelisted(); error InvalidMintPayment(); error MintingByContractNotAllowed(); error InvalidMintPrice(); error InvalidTreasureAddress(); error MintHalted(); event NewPrice(uint price); event NewLimits(uint _public, uint _whitelisted, uint _wlInitial); event MintPeriod(uint _public, uint _whitelisted); constructor( uint _minGasToTransfer, address _layerZeroEndpoint, uint _startMintId, uint _maxMintId, uint _whitelistStartPeriod, uint _whitelistEndPeriod, bytes32 _merkleRoot, uint _mintPrice, address _treasure ) ONFT721("Xexadons", "XDON", _minGasToTransfer, _layerZeroEndpoint) { if( _startMintId == 0) revert InvalidMintStartId(); if (_maxMintId == 0) revert InvalidMaxMint(); if (_whitelistStartPeriod == 0 || _whitelistEndPeriod == 0 || _whitelistStartPeriod >= _whitelistEndPeriod) revert InvalidMintDates(); if( _mintPrice == 0 ) revert InvalidMintPrice(); if( _treasure == address(0) ) revert InvalidTreasureAddress(); mintPrice = _mintPrice; whitelistStartPeriod = _whitelistStartPeriod; whitelistEndPeriod = _whitelistEndPeriod; nextMintId = _startMintId; maxMintId = _maxMintId; merkleRoot = _merkleRoot; treasure = _treasure; emit NewPrice(mintPrice); whitelistedMintLimit = publicMintLimit + whitelistedInitialLimit; emit NewLimits(publicMintLimit, whitelistedMintLimit, whitelistedInitialLimit); emit MintPeriod(whitelistStartPeriod, whitelistEndPeriod); } function contractURI() public view returns (string memory) { return "https://xexadons.com/contract.json"; } function haltMint() external onlyOwner{ mintHalted = true; } function setMintLimits(uint _public, uint _whitelistedInitialLimit) external onlyOwner { publicMintLimit = _public; whitelistedInitialLimit = _whitelistedInitialLimit; whitelistedMintLimit = publicMintLimit + whitelistedInitialLimit; emit NewLimits(publicMintLimit, whitelistedMintLimit, _whitelistedInitialLimit); } function setMintPeriods(uint _start, uint _end) external onlyOwner { whitelistStartPeriod = _start; whitelistEndPeriod = _end; emit MintPeriod(whitelistStartPeriod, whitelistEndPeriod); } function setMintPrice(uint _price) external onlyOwner { if (_price == 0) revert SetMintPriceInvalid(); mintPrice = _price; emit NewPrice(mintPrice); } function setTreasure(address _treasure) external onlyOwner { if( _treasure == address(0) ) revert SetTreasureInvalid(); treasure = _treasure; } function tokenURI(uint tokenId) public view override returns (string memory) { return bytes(baseURI_).length > 0 ? string(abi.encodePacked(baseURI_, tokenId.toString(), ".json")) : "https://xexadons.com/xdon.json"; } function setBaseURI(string memory _baseURI_) public onlyOwner { baseURI_ = _baseURI_; } modifier standardChecks(){ // do not allow minting by a contract if( msg.sender != tx.origin ){ revert MintingByContractNotAllowed(); } // stop minting at any time, not possible to mint again if (mintHalted){ revert MintHalted(); } // prevent minting before mint period start if (block.timestamp < whitelistStartPeriod){ revert MintPeriodNotStarted(); } _; } function checkProof(bytes32[] memory proof) public view returns(bool){ bytes32 leaf = keccak256(bytes.concat(keccak256(abi.encode(msg.sender, block.chainid)))); return MerkleProof.verify(proof, merkleRoot, leaf); } function claim(bytes32[] memory proof) external payable standardChecks { // check if we are inside whitelist mint period if (block.timestamp > whitelistEndPeriod) { revert MintPeriodEnded(); } // user must be in the whitelist for this chain. if (!checkProof(proof)){ revert InvalidProof(); } // each whitelisted user can mint only 1 nft if( userMints[msg.sender] >= whitelistedInitialLimit ){ revert MaxAllowedForWhitelisted(); } uint newId = nextMintId; // check if we reached the max mint for this chain if (nextMintId > maxMintId){ revert MaxMintReached(); } nextMintId++; userMints[msg.sender]++; _safeMint(msg.sender, newId); // check if user is correctly paying for this mint if( msg.value < mintPrice ){ revert InvalidMintPayment(); } (bool paymentValid, ) = payable(treasure).call{value: address(this).balance}(""); // revert if sending funds to treasure return error if( ! paymentValid ){ revert InvalidPaymentTransfer(); } } function mint( bytes32[] memory proof ) external payable standardChecks { // above whitelist mint period, user can mint up to 2 nft if( block.timestamp < whitelistEndPeriod ){ revert PublicMintNotStarted(); } if ( checkProof(proof) ){ // if user is whitelisted he can mint: // - 1 from whitelist // - 1 from public mint if( userMints[msg.sender] >= whitelistedMintLimit ){ revert MaxAllowedForWhitelisted(); } }else{ // if not invalid proof, user can mint only 1 if( userMints[msg.sender] >= publicMintLimit ){ revert MaxAllowedForPublic(); } } uint newId = nextMintId; nextMintId++; // check if we reached the max mint for this chain if (nextMintId > maxMintId){ revert MaxMintReached(); } userMints[msg.sender]++; _safeMint(msg.sender, newId); // check if user is correctly paying for this mint if( msg.value < mintPrice ){ revert InvalidMintPayment(); } (bool paymentValid, ) = payable(treasure).call{value: address(this).balance}(""); // revert if sending funds to treasure return error if( ! paymentValid ){ revert InvalidPaymentTransfer(); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/ERC721.sol) pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: address zero is not a valid owner"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _ownerOf(tokenId); require(owner != address(0), "ERC721: invalid token ID"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { _requireMinted(tokenId); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overridden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not token owner or approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { _requireMinted(tokenId); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { _setApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved"); _safeTransfer(from, to, tokenId, data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist */ function _ownerOf(uint256 tokenId) internal view virtual returns (address) { return _owners[tokenId]; } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _ownerOf(tokenId) != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { address owner = ERC721.ownerOf(tokenId); return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address to, uint256 tokenId, bytes memory data ) internal virtual { _mint(to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer" ); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId, 1); // Check that tokenId was not minted by `_beforeTokenTransfer` hook require(!_exists(tokenId), "ERC721: token already minted"); unchecked { // Will not overflow unless all 2**256 token ids are minted to the same owner. // Given that tokens are minted one by one, it is impossible in practice that // this ever happens. Might change if we allow batch minting. // The ERC fails to describe this case. _balances[to] += 1; } _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); _afterTokenTransfer(address(0), to, tokenId, 1); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * This is an internal function that does not check if the sender is authorized to operate on the token. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId, 1); // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook owner = ERC721.ownerOf(tokenId); // Clear approvals delete _tokenApprovals[tokenId]; unchecked { // Cannot overflow, as that would require more tokens to be burned/transferred // out than the owner initially received through minting and transferring in. _balances[owner] -= 1; } delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); _afterTokenTransfer(owner, address(0), tokenId, 1); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer( address from, address to, uint256 tokenId ) internal virtual { require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner"); require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId, 1); // Check that tokenId was not transferred by `_beforeTokenTransfer` hook require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner"); // Clear approvals from the previous owner delete _tokenApprovals[tokenId]; unchecked { // `_balances[from]` cannot overflow for the same reason as described in `_burn`: // `from`'s balance is the number of token held, which is at least one before the current // transfer. // `_balances[to]` could overflow in the conditions described in `_mint`. That would require // all 2**256 token ids to be minted, which in practice is impossible. _balances[from] -= 1; _balances[to] += 1; } _owners[tokenId] = to; emit Transfer(from, to, tokenId); _afterTokenTransfer(from, to, tokenId, 1); } /** * @dev Approve `to` to operate on `tokenId` * * Emits an {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Approve `operator` to operate on all of `owner` tokens * * Emits an {ApprovalForAll} event. */ function _setApprovalForAll( address owner, address operator, bool approved ) internal virtual { require(owner != operator, "ERC721: approve to caller"); _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @dev Reverts if the `tokenId` has not been minted yet. */ function _requireMinted(uint256 tokenId) internal view virtual { require(_exists(tokenId), "ERC721: invalid token ID"); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes memory data ) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) { return retval == IERC721Receiver.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { /// @solidity memory-safe-assembly assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`. * - When `from` is zero, the tokens will be minted for `to`. * - When `to` is zero, ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256, /* firstTokenId */ uint256 batchSize ) internal virtual { if (batchSize > 1) { if (from != address(0)) { _balances[from] -= batchSize; } if (to != address(0)) { _balances[to] += batchSize; } } } /** * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`. * - When `from` is zero, the tokens were minted for `to`. * - When `to` is zero, ``from``'s tokens were burned. * - `from` and `to` are never both zero. * - `batchSize` is non-zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 firstTokenId, uint256 batchSize ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Enumerable.sol) pragma solidity ^0.8.0; import "../ERC721.sol"; import "./IERC721Enumerable.sol"; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @dev See {ERC721-_beforeTokenTransfer}. */ function _beforeTokenTransfer( address from, address to, uint256 firstTokenId, uint256 batchSize ) internal virtual override { super._beforeTokenTransfer(from, to, firstTokenId, batchSize); if (batchSize > 1) { // Will only trigger during construction. Batch transferring (minting) is not available afterwards. revert("ERC721Enumerable: consecutive transfers not supported"); } uint256 tokenId = firstTokenId; if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol) pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol) pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - 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 tokenId, bytes calldata data ) external; /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}. * - 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 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must * understand this adds an external call which potentially creates a reentrancy vulnerability. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol) pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// 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 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 v4.8.0) (utils/cryptography/MerkleProof.sol) pragma solidity ^0.8.0; /** * @dev These functions deal with verification of Merkle Tree proofs. * * The tree and the proofs can be generated using our * https://github.com/OpenZeppelin/merkle-tree[JavaScript library]. * You will find a quickstart guide in the readme. * * WARNING: You should avoid using leaf values that are 64 bytes long prior to * hashing, or use a hash function other than keccak256 for hashing leaves. * This is because the concatenation of a sorted pair of internal nodes in * the merkle tree could be reinterpreted as a leaf value. * OpenZeppelin's JavaScript library generates merkle trees that are safe * against this attack out of the box. */ library MerkleProof { /** * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree * defined by `root`. For this, a `proof` must be provided, containing * sibling hashes on the branch from the leaf to the root of the tree. Each * pair of leaves and each pair of pre-images are assumed to be sorted. */ function verify( bytes32[] memory proof, bytes32 root, bytes32 leaf ) internal pure returns (bool) { return processProof(proof, leaf) == root; } /** * @dev Calldata version of {verify} * * _Available since v4.7._ */ function verifyCalldata( bytes32[] calldata proof, bytes32 root, bytes32 leaf ) internal pure returns (bool) { return processProofCalldata(proof, leaf) == root; } /** * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt * hash matches the root of the tree. When processing the proof, the pairs * of leafs & pre-images are assumed to be sorted. * * _Available since v4.4._ */ function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { computedHash = _hashPair(computedHash, proof[i]); } return computedHash; } /** * @dev Calldata version of {processProof} * * _Available since v4.7._ */ function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { computedHash = _hashPair(computedHash, proof[i]); } return computedHash; } /** * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}. * * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details. * * _Available since v4.7._ */ function multiProofVerify( bytes32[] memory proof, bool[] memory proofFlags, bytes32 root, bytes32[] memory leaves ) internal pure returns (bool) { return processMultiProof(proof, proofFlags, leaves) == root; } /** * @dev Calldata version of {multiProofVerify} * * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details. * * _Available since v4.7._ */ function multiProofVerifyCalldata( bytes32[] calldata proof, bool[] calldata proofFlags, bytes32 root, bytes32[] memory leaves ) internal pure returns (bool) { return processMultiProofCalldata(proof, proofFlags, leaves) == root; } /** * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false * respectively. * * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer). * * _Available since v4.7._ */ function processMultiProof( bytes32[] memory proof, bool[] memory proofFlags, bytes32[] memory leaves ) internal pure returns (bytes32 merkleRoot) { // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of // the merkle tree. uint256 leavesLen = leaves.length; uint256 totalHashes = proofFlags.length; // Check proof validity. require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof"); // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop". bytes32[] memory hashes = new bytes32[](totalHashes); uint256 leafPos = 0; uint256 hashPos = 0; uint256 proofPos = 0; // At each step, we compute the next hash using two values: // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we // get the next hash. // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the // `proof` array. for (uint256 i = 0; i < totalHashes; i++) { bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++]; bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++]; hashes[i] = _hashPair(a, b); } if (totalHashes > 0) { return hashes[totalHashes - 1]; } else if (leavesLen > 0) { return leaves[0]; } else { return proof[0]; } } /** * @dev Calldata version of {processMultiProof}. * * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details. * * _Available since v4.7._ */ function processMultiProofCalldata( bytes32[] calldata proof, bool[] calldata proofFlags, bytes32[] memory leaves ) internal pure returns (bytes32 merkleRoot) { // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of // the merkle tree. uint256 leavesLen = leaves.length; uint256 totalHashes = proofFlags.length; // Check proof validity. require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof"); // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop". bytes32[] memory hashes = new bytes32[](totalHashes); uint256 leafPos = 0; uint256 hashPos = 0; uint256 proofPos = 0; // At each step, we compute the next hash using two values: // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we // get the next hash. // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the // `proof` array. for (uint256 i = 0; i < totalHashes; i++) { bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++]; bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++]; hashes[i] = _hashPair(a, b); } if (totalHashes > 0) { return hashes[totalHashes - 1]; } else if (leavesLen > 0) { return leaves[0]; } else { return proof[0]; } } function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) { return a < b ? _efficientHash(a, b) : _efficientHash(b, a); } function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) { /// @solidity memory-safe-assembly assembly { mstore(0x00, a) mstore(0x20, b) value := keccak256(0x00, 0x40) } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// 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 // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "./math/Math.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), _SYMBOLS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; import "./ILayerZeroUserApplicationConfig.sol"; interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig { // @notice send a LayerZero message to the specified address at a LayerZero endpoint. // @param _dstChainId - the destination chain identifier // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains // @param _payload - a custom bytes payload to send to the destination contract // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable; // @notice used by the messaging library to publish verified payload // @param _srcChainId - the source chain identifier // @param _srcAddress - the source contract (as bytes) at the source chain // @param _dstAddress - the address on destination chain // @param _nonce - the unbound message ordering nonce // @param _gasLimit - the gas limit for external contract execution // @param _payload - verified payload to send to the destination contract function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external; // @notice get the inboundNonce of a lzApp from a source chain which could be EVM or non-EVM chain // @param _srcChainId - the source chain identifier // @param _srcAddress - the source chain contract address function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64); // @notice get the outboundNonce from this source chain which, consequently, is always an EVM // @param _srcAddress - the source chain contract address function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64); // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery // @param _dstChainId - the destination chain identifier // @param _userApplication - the user app address on this EVM chain // @param _payload - the custom message to send over LayerZero // @param _payInZRO - if false, user app pays the protocol fee in native token // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee); // @notice get this Endpoint's immutable source identifier function getChainId() external view returns (uint16); // @notice the interface to retry failed message on this Endpoint destination // @param _srcChainId - the source chain identifier // @param _srcAddress - the source chain contract address // @param _payload - the payload to be retried function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external; // @notice query if any STORED payload (message blocking) at the endpoint. // @param _srcChainId - the source chain identifier // @param _srcAddress - the source chain contract address function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool); // @notice query if the _libraryAddress is valid for sending msgs. // @param _userApplication - the user app address on this EVM chain function getSendLibraryAddress(address _userApplication) external view returns (address); // @notice query if the _libraryAddress is valid for receiving msgs. // @param _userApplication - the user app address on this EVM chain function getReceiveLibraryAddress(address _userApplication) external view returns (address); // @notice query if the non-reentrancy guard for send() is on // @return true if the guard is on. false otherwise function isSendingPayload() external view returns (bool); // @notice query if the non-reentrancy guard for receive() is on // @return true if the guard is on. false otherwise function isReceivingPayload() external view returns (bool); // @notice get the configuration of the LayerZero messaging library of the specified version // @param _version - messaging library version // @param _chainId - the chainId for the pending config change // @param _userApplication - the contract address of the user application // @param _configType - type of configuration. every messaging library has its own convention. function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory); // @notice get the send() LayerZero messaging library version // @param _userApplication - the contract address of the user application function getSendVersion(address _userApplication) external view returns (uint16); // @notice get the lzReceive() LayerZero messaging library version // @param _userApplication - the contract address of the user application function getReceiveVersion(address _userApplication) external view returns (uint16); }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; interface ILayerZeroReceiver { // @notice LayerZero endpoint will invoke this function to deliver the message on the destination // @param _srcChainId - the source endpoint identifier // @param _srcAddress - the source sending contract address from the source chain // @param _nonce - the ordered message nonce // @param _payload - the signed payload is the UA bytes has encoded to be sent function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external; }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; interface ILayerZeroUserApplicationConfig { // @notice set the configuration of the LayerZero messaging library of the specified version // @param _version - messaging library version // @param _chainId - the chainId for the pending config change // @param _configType - type of configuration. every messaging library has its own convention. // @param _config - configuration in the bytes. can encode arbitrary content. function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external; // @notice set the send() LayerZero messaging library version to _version // @param _version - new messaging library version function setSendVersion(uint16 _version) external; // @notice set the lzReceive() LayerZero messaging library version to _version // @param _version - new messaging library version function setReceiveVersion(uint16 _version) external; // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload // @param _srcChainId - the chainId of the source chain // @param _srcAddress - the contract address of the source contract at the source chain function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/access/Ownable.sol"; import "../interfaces/ILayerZeroReceiver.sol"; import "../interfaces/ILayerZeroUserApplicationConfig.sol"; import "../interfaces/ILayerZeroEndpoint.sol"; import "../util/BytesLib.sol"; /* * a generic LzReceiver implementation */ abstract contract LzApp is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig { using BytesLib for bytes; ILayerZeroEndpoint public lzEndpoint; mapping(uint16 => bytes) public trustedRemoteLookup; mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup; address public precrime; event SetPrecrime(address precrime); event SetTrustedRemote(uint16 _remoteChainId, bytes _path); event SetTrustedRemoteAddress(uint16 _remoteChainId, bytes _remoteAddress); event SetMinDstGas(uint16 _dstChainId, uint16 _type, uint _minDstGas); constructor(address _endpoint) { lzEndpoint = ILayerZeroEndpoint(_endpoint); } function setEndpoint(address _endpoint) external onlyOwner { require( address(lzEndpoint) == address(0)); lzEndpoint = ILayerZeroEndpoint(_endpoint); } function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public virtual override { // lzReceive must be called by the endpoint for security require(_msgSender() == address(lzEndpoint), "LzApp: invalid endpoint caller"); bytes memory trustedRemote = trustedRemoteLookup[_srcChainId]; // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote. require(_srcAddress.length == trustedRemote.length && trustedRemote.length > 0 && keccak256(_srcAddress) == keccak256(trustedRemote), "LzApp: invalid source sending contract"); _blockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload); } // abstract function - the default behaviour of LayerZero is blocking. See: NonblockingLzApp if you dont need to enforce ordered messaging function _blockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual; function _lzSend(uint16 _dstChainId, bytes memory _payload, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams, uint _nativeFee) internal virtual { bytes memory trustedRemote = trustedRemoteLookup[_dstChainId]; require(trustedRemote.length != 0, "LzApp: destination chain is not a trusted source"); lzEndpoint.send{value: _nativeFee}(_dstChainId, trustedRemote, _payload, _refundAddress, _zroPaymentAddress, _adapterParams); } function _checkGasLimit(uint16 _dstChainId, uint16 _type, bytes memory _adapterParams, uint _extraGas) internal view virtual { uint providedGasLimit = _getGasLimit(_adapterParams); uint minGasLimit = minDstGasLookup[_dstChainId][_type] + _extraGas; require(minGasLimit > 0, "LzApp: minGasLimit not set"); require(providedGasLimit >= minGasLimit, "LzApp: gas limit is too low"); } function _getGasLimit(bytes memory _adapterParams) internal pure virtual returns (uint gasLimit) { require(_adapterParams.length >= 34, "LzApp: invalid adapterParams"); assembly { gasLimit := mload(add(_adapterParams, 34)) } } //---------------------------UserApplication config---------------------------------------- function getConfig(uint16 _version, uint16 _chainId, address, uint _configType) external view returns (bytes memory) { return lzEndpoint.getConfig(_version, _chainId, address(this), _configType); } // generic config for LayerZero user Application function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external override onlyOwner { lzEndpoint.setConfig(_version, _chainId, _configType, _config); } function setSendVersion(uint16 _version) external override onlyOwner { lzEndpoint.setSendVersion(_version); } function setReceiveVersion(uint16 _version) external override onlyOwner { lzEndpoint.setReceiveVersion(_version); } function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner { lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress); } // _path = abi.encodePacked(remoteAddress, localAddress) // this function set the trusted path for the cross-chain communication function setTrustedRemote(uint16 _srcChainId, bytes calldata _path) external onlyOwner { trustedRemoteLookup[_srcChainId] = _path; emit SetTrustedRemote(_srcChainId, _path); } function setTrustedRemoteAddress(uint16 _remoteChainId, bytes calldata _remoteAddress) external onlyOwner { trustedRemoteLookup[_remoteChainId] = abi.encodePacked(_remoteAddress, address(this)); emit SetTrustedRemoteAddress(_remoteChainId, _remoteAddress); } function getTrustedRemoteAddress(uint16 _remoteChainId) external view returns (bytes memory) { bytes memory path = trustedRemoteLookup[_remoteChainId]; require(path.length != 0, "LzApp: no trusted path record"); return path.slice(0, path.length - 20); // the last 20 bytes should be address(this) } function setPrecrime(address _precrime) external onlyOwner { precrime = _precrime; emit SetPrecrime(_precrime); } function setMinDstGas(uint16 _dstChainId, uint16 _packetType, uint _minGas) external onlyOwner { require(_minGas > 0, "LzApp: invalid minGas"); minDstGasLookup[_dstChainId][_packetType] = _minGas; emit SetMinDstGas(_dstChainId, _packetType, _minGas); } //--------------------------- VIEW FUNCTION ---------------------------------------- function isTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool) { bytes memory trustedSource = trustedRemoteLookup[_srcChainId]; return keccak256(trustedSource) == keccak256(_srcAddress); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./LzApp.sol"; import "../util/ExcessivelySafeCall.sol"; /* * the default LayerZero messaging behaviour is blocking, i.e. any failed message will block the channel * this abstract class try-catch all fail messages and store locally for future retry. hence, non-blocking * NOTE: if the srcAddress is not configured properly, it will still block the message pathway from (srcChainId, srcAddress) */ abstract contract NonblockingLzApp is LzApp { using ExcessivelySafeCall for address; constructor(address _endpoint) LzApp(_endpoint) {} mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32))) public failedMessages; event MessageFailed(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes _payload, bytes _reason); event RetryMessageSuccess(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _payloadHash); // overriding the virtual function in LzReceiver function _blockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual override { (bool success, bytes memory reason) = address(this).excessivelySafeCall(gasleft(), 150, abi.encodeWithSelector(this.nonblockingLzReceive.selector, _srcChainId, _srcAddress, _nonce, _payload)); // try-catch all errors/exceptions if (!success) { _storeFailedMessage(_srcChainId, _srcAddress, _nonce, _payload, reason); } } function _storeFailedMessage(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload, bytes memory _reason) internal virtual { failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload); emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload, _reason); } function nonblockingLzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public virtual { // only internal transaction require(_msgSender() == address(this)); _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload); } //@notice override this function function _nonblockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual; function retryMessage(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public payable virtual { // assert there is message to retry bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce]; require(payloadHash != bytes32(0)); require(keccak256(_payload) == payloadHash); // clear the stored message failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0); // execute the message. revert if it fails again _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload); emit RetryMessageSuccess(_srcChainId, _srcAddress, _nonce, payloadHash); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; import "./IONFT721Core.sol"; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; /** * @dev Interface of the ONFT standard */ interface IONFT721 is IONFT721Core, IERC721 { }
// SPDX-License-Identifier: MIT pragma solidity >=0.5.0; import "@openzeppelin/contracts/utils/introspection/IERC165.sol"; /** * @dev Interface of the ONFT Core standard */ interface IONFT721Core is IERC165 { /** * @dev Emitted when `_tokenIds[]` are moved from the `_sender` to (`_dstChainId`, `_toAddress`) * `_nonce` is the outbound nonce from */ event SendToChain(uint16 indexed _dstChainId, address indexed _from, bytes indexed _toAddress, uint[] _tokenIds); event ReceiveFromChain(uint16 indexed _srcChainId, bytes indexed _srcAddress, address indexed _toAddress, uint[] _tokenIds); /** * @dev Emitted when `_payload` was received from lz, but not enough gas to deliver all tokenIds */ event CreditStored(bytes32 _hashedPayload, bytes _payload); /** * @dev Emitted when `_hashedPayload` has been completely delivered */ event CreditCleared(bytes32 _hashedPayload); /** * @dev send token `_tokenId` to (`_dstChainId`, `_toAddress`) from `_from` * `_toAddress` can be any size depending on the `dstChainId`. * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token) * `_adapterParams` is a flexible bytes array to indicate messaging adapter services */ function sendFrom(address _from, uint16 _dstChainId, bytes calldata _toAddress, uint _tokenId, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable; /** * @dev send tokens `_tokenIds[]` to (`_dstChainId`, `_toAddress`) from `_from` * `_toAddress` can be any size depending on the `dstChainId`. * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token) * `_adapterParams` is a flexible bytes array to indicate messaging adapter services */ function sendBatchFrom(address _from, uint16 _dstChainId, bytes calldata _toAddress, uint[] calldata _tokenIds, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable; /** * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`) * _dstChainId - L0 defined chain id to send tokens too * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain * _tokenId - token Id to transfer * _useZro - indicates to use zro to pay L0 fees * _adapterParams - flexible bytes array to indicate messaging adapter services in L0 */ function estimateSendFee(uint16 _dstChainId, bytes calldata _toAddress, uint _tokenId, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee); /** * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`) * _dstChainId - L0 defined chain id to send tokens too * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain * _tokenIds[] - token Ids to transfer * _useZro - indicates to use zro to pay L0 fees * _adapterParams - flexible bytes array to indicate messaging adapter services in L0 */ function estimateSendBatchFee(uint16 _dstChainId, bytes calldata _toAddress, uint[] calldata _tokenIds, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IONFT721.sol"; import "./ONFT721Core.sol"; import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; // NOTE: this ONFT contract has no public minting logic. // must implement your own minting logic in child classes contract ONFT721 is ONFT721Core, ERC721, IONFT721, ERC721Enumerable { constructor(string memory _name, string memory _symbol, uint256 _minGasToTransfer, address _lzEndpoint) ERC721(_name, _symbol) ONFT721Core(_minGasToTransfer, _lzEndpoint) {} function supportsInterface(bytes4 interfaceId) public view virtual override(ONFT721Core, ERC721Enumerable, ERC721, IERC165) returns (bool) { return interfaceId == type(IONFT721).interfaceId || super.supportsInterface(interfaceId); } function _debitFrom(address _from, uint16, bytes memory, uint _tokenId) internal virtual override { require(_isApprovedOrOwner(_msgSender(), _tokenId), "ONFT721: send caller is not owner nor approved"); require(ERC721.ownerOf(_tokenId) == _from, "ONFT721: send from incorrect owner"); _transfer(_from, address(this), _tokenId); } function _creditTo(uint16, address _toAddress, uint _tokenId) internal virtual override { require(!_exists(_tokenId) || (_exists(_tokenId) && ERC721.ownerOf(_tokenId) == address(this))); if (!_exists(_tokenId)) { _safeMint(_toAddress, _tokenId); } else { _transfer(address(this), _toAddress, _tokenId); } } function _beforeTokenTransfer( address from, address to, uint256 firstTokenId, uint256 batchSize ) internal override(ERC721Enumerable, ERC721) { super._beforeTokenTransfer(from, to, firstTokenId, batchSize); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IONFT721Core.sol"; import "../../lzApp/NonblockingLzApp.sol"; import "@openzeppelin/contracts/utils/introspection/ERC165.sol"; abstract contract ONFT721Core is NonblockingLzApp, ERC165, IONFT721Core { uint16 public constant FUNCTION_TYPE_SEND = 1; struct StoredCredit { uint16 srcChainId; address toAddress; uint256 index; // which index of the tokenIds remain bool creditsRemain; } uint256 public minGasToTransferAndStore; // min amount of gas required to transfer, and also store the payload mapping(uint16 => uint256) public dstChainIdToBatchLimit; mapping(uint16 => uint256) public dstChainIdToTransferGas; // per transfer amount of gas required to mint/transfer on the dst mapping(bytes32 => StoredCredit) public storedCredits; constructor(uint256 _minGasToTransferAndStore, address _lzEndpoint) NonblockingLzApp(_lzEndpoint) { require(_minGasToTransferAndStore > 0, "ONFT721: minGasToTransferAndStore must be > 0"); minGasToTransferAndStore = _minGasToTransferAndStore; } function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IONFT721Core).interfaceId || super.supportsInterface(interfaceId); } function estimateSendFee(uint16 _dstChainId, bytes memory _toAddress, uint _tokenId, bool _useZro, bytes memory _adapterParams) public view virtual override returns (uint nativeFee, uint zroFee) { return estimateSendBatchFee(_dstChainId, _toAddress, _toSingletonArray(_tokenId), _useZro, _adapterParams); } function estimateSendBatchFee(uint16 _dstChainId, bytes memory _toAddress, uint[] memory _tokenIds, bool _useZro, bytes memory _adapterParams) public view virtual override returns (uint nativeFee, uint zroFee) { bytes memory payload = abi.encode(_toAddress, _tokenIds); return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams); } function sendFrom(address _from, uint16 _dstChainId, bytes memory _toAddress, uint _tokenId, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams) public payable virtual override { _send(_from, _dstChainId, _toAddress, _toSingletonArray(_tokenId), _refundAddress, _zroPaymentAddress, _adapterParams); } function sendBatchFrom(address _from, uint16 _dstChainId, bytes memory _toAddress, uint[] memory _tokenIds, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams) public payable virtual override { _send(_from, _dstChainId, _toAddress, _tokenIds, _refundAddress, _zroPaymentAddress, _adapterParams); } function _send(address _from, uint16 _dstChainId, bytes memory _toAddress, uint[] memory _tokenIds, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams) internal virtual { // allow 1 by default require(_tokenIds.length > 0, "LzApp: tokenIds[] is empty"); require(_tokenIds.length == 1 || _tokenIds.length <= dstChainIdToBatchLimit[_dstChainId], "ONFT721: batch size exceeds dst batch limit"); for (uint i = 0; i < _tokenIds.length; i++) { _debitFrom(_from, _dstChainId, _toAddress, _tokenIds[i]); } bytes memory payload = abi.encode(_toAddress, _tokenIds); _checkGasLimit(_dstChainId, FUNCTION_TYPE_SEND, _adapterParams, dstChainIdToTransferGas[_dstChainId] * _tokenIds.length); _lzSend(_dstChainId, payload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value); emit SendToChain(_dstChainId, _from, _toAddress, _tokenIds); } function _nonblockingLzReceive( uint16 _srcChainId, bytes memory _srcAddress, uint64, /*_nonce*/ bytes memory _payload ) internal virtual override { // decode and load the toAddress (bytes memory toAddressBytes, uint[] memory tokenIds) = abi.decode(_payload, (bytes, uint[])); address toAddress; assembly { toAddress := mload(add(toAddressBytes, 20)) } uint nextIndex = _creditTill(_srcChainId, toAddress, 0, tokenIds); if (nextIndex < tokenIds.length) { // not enough gas to complete transfers, store to be cleared in another tx bytes32 hashedPayload = keccak256(_payload); storedCredits[hashedPayload] = StoredCredit(_srcChainId, toAddress, nextIndex, true); emit CreditStored(hashedPayload, _payload); } emit ReceiveFromChain(_srcChainId, _srcAddress, toAddress, tokenIds); } // Public function for anyone to clear and deliver the remaining batch sent tokenIds function clearCredits(bytes memory _payload) external { bytes32 hashedPayload = keccak256(_payload); require(storedCredits[hashedPayload].creditsRemain, "ONFT721: no credits stored"); (, uint[] memory tokenIds) = abi.decode(_payload, (bytes, uint[])); uint nextIndex = _creditTill(storedCredits[hashedPayload].srcChainId, storedCredits[hashedPayload].toAddress, storedCredits[hashedPayload].index, tokenIds); require(nextIndex > storedCredits[hashedPayload].index, "ONFT721: not enough gas to process credit transfer"); if (nextIndex == tokenIds.length) { // cleared the credits, delete the element delete storedCredits[hashedPayload]; emit CreditCleared(hashedPayload); } else { // store the next index to mint storedCredits[hashedPayload] = StoredCredit(storedCredits[hashedPayload].srcChainId, storedCredits[hashedPayload].toAddress, nextIndex, true); } } // When a srcChain has the ability to transfer more chainIds in a single tx than the dst can do. // Needs the ability to iterate and stop if the minGasToTransferAndStore is not met function _creditTill(uint16 _srcChainId, address _toAddress, uint _startIndex, uint[] memory _tokenIds) internal returns (uint256){ uint i = _startIndex; while (i < _tokenIds.length) { // if not enough gas to process, store this index for next loop if (gasleft() < minGasToTransferAndStore) break; _creditTo(_srcChainId, _toAddress, _tokenIds[i]); i++; } // indicates the next index to send of tokenIds, // if i == tokenIds.length, we are finished return i; } function setMinGasToTransferAndStore(uint256 _minGasToTransferAndStore) external onlyOwner { require(_minGasToTransferAndStore > 0, "ONFT721: minGasToTransferAndStore must be > 0"); minGasToTransferAndStore = _minGasToTransferAndStore; } // ensures enough gas in adapter params to handle batch transfer gas amounts on the dst function setDstChainIdToTransferGas(uint16 _dstChainId, uint256 _dstChainIdToTransferGas) external onlyOwner { require(_dstChainIdToTransferGas > 0, "ONFT721: dstChainIdToTransferGas must be > 0"); dstChainIdToTransferGas[_dstChainId] = _dstChainIdToTransferGas; } // limit on src the amount of tokens to batch send function setDstChainIdToBatchLimit(uint16 _dstChainId, uint256 _dstChainIdToBatchLimit) external onlyOwner { require(_dstChainIdToBatchLimit > 0, "ONFT721: dstChainIdToBatchLimit must be > 0"); dstChainIdToBatchLimit[_dstChainId] = _dstChainIdToBatchLimit; } function _debitFrom(address _from, uint16 _dstChainId, bytes memory _toAddress, uint _tokenId) internal virtual; function _creditTo(uint16 _srcChainId, address _toAddress, uint _tokenId) internal virtual; function _toSingletonArray(uint element) internal pure returns (uint[] memory) { uint[] memory array = new uint[](1); array[0] = element; return array; } }
// SPDX-License-Identifier: Unlicense /* * @title Solidity Bytes Arrays Utils * @author Gonçalo Sá <[email protected]> * * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity. * The library lets you concatenate, slice and type cast bytes arrays both in memory and storage. */ pragma solidity >=0.8.0 <0.9.0; library BytesLib { function concat( bytes memory _preBytes, bytes memory _postBytes ) internal pure returns (bytes memory) { bytes memory tempBytes; assembly { // Get a location of some free memory and store it in tempBytes as // Solidity does for memory variables. tempBytes := mload(0x40) // Store the length of the first bytes array at the beginning of // the memory for tempBytes. let length := mload(_preBytes) mstore(tempBytes, length) // Maintain a memory counter for the current write location in the // temp bytes array by adding the 32 bytes for the array length to // the starting location. let mc := add(tempBytes, 0x20) // Stop copying when the memory counter reaches the length of the // first bytes array. let end := add(mc, length) for { // Initialize a copy counter to the start of the _preBytes data, // 32 bytes into its memory. let cc := add(_preBytes, 0x20) } lt(mc, end) { // Increase both counters by 32 bytes each iteration. mc := add(mc, 0x20) cc := add(cc, 0x20) } { // Write the _preBytes data into the tempBytes memory 32 bytes // at a time. mstore(mc, mload(cc)) } // Add the length of _postBytes to the current length of tempBytes // and store it as the new length in the first 32 bytes of the // tempBytes memory. length := mload(_postBytes) mstore(tempBytes, add(length, mload(tempBytes))) // Move the memory counter back from a multiple of 0x20 to the // actual end of the _preBytes data. mc := end // Stop copying when the memory counter reaches the new combined // length of the arrays. end := add(mc, length) for { let cc := add(_postBytes, 0x20) } lt(mc, end) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { mstore(mc, mload(cc)) } // Update the free-memory pointer by padding our last write location // to 32 bytes: add 31 bytes to the end of tempBytes to move to the // next 32 byte block, then round down to the nearest multiple of // 32. If the sum of the length of the two arrays is zero then add // one before rounding down to leave a blank 32 bytes (the length block with 0). mstore(0x40, and( add(add(end, iszero(add(length, mload(_preBytes)))), 31), not(31) // Round down to the nearest 32 bytes. )) } return tempBytes; } function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal { assembly { // Read the first 32 bytes of _preBytes storage, which is the length // of the array. (We don't need to use the offset into the slot // because arrays use the entire slot.) let fslot := sload(_preBytes.slot) // Arrays of 31 bytes or less have an even value in their slot, // while longer arrays have an odd value. The actual length is // the slot divided by two for odd values, and the lowest order // byte divided by two for even values. // If the slot is even, bitwise and the slot with 255 and divide by // two to get the length. If the slot is odd, bitwise and the slot // with -1 and divide by two. let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) let mlength := mload(_postBytes) let newlength := add(slength, mlength) // slength can contain both the length and contents of the array // if length < 32 bytes so let's prepare for that // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage switch add(lt(slength, 32), lt(newlength, 32)) case 2 { // Since the new array still fits in the slot, we just need to // update the contents of the slot. // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length sstore( _preBytes.slot, // all the modifications to the slot are inside this // next block add( // we can just add to the slot contents because the // bytes we want to change are the LSBs fslot, add( mul( div( // load the bytes from memory mload(add(_postBytes, 0x20)), // zero all bytes to the right exp(0x100, sub(32, mlength)) ), // and now shift left the number of bytes to // leave space for the length in the slot exp(0x100, sub(32, newlength)) ), // increase length by the double of the memory // bytes length mul(mlength, 2) ) ) ) } case 1 { // The stored value fits in the slot, but the combined value // will exceed it. // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) let sc := add(keccak256(0x0, 0x20), div(slength, 32)) // save new length sstore(_preBytes.slot, add(mul(newlength, 2), 1)) // The contents of the _postBytes array start 32 bytes into // the structure. Our first read should obtain the `submod` // bytes that can fit into the unused space in the last word // of the stored array. To get this, we read 32 bytes starting // from `submod`, so the data we read overlaps with the array // contents by `submod` bytes. Masking the lowest-order // `submod` bytes allows us to add that value directly to the // stored value. let submod := sub(32, slength) let mc := add(_postBytes, submod) let end := add(_postBytes, mlength) let mask := sub(exp(0x100, submod), 1) sstore( sc, add( and( fslot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00 ), and(mload(mc), mask) ) ) for { mc := add(mc, 0x20) sc := add(sc, 1) } lt(mc, end) { sc := add(sc, 1) mc := add(mc, 0x20) } { sstore(sc, mload(mc)) } mask := exp(0x100, sub(mc, end)) sstore(sc, mul(div(mload(mc), mask), mask)) } default { // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) // Start copying to the last used word of the stored array. let sc := add(keccak256(0x0, 0x20), div(slength, 32)) // save new length sstore(_preBytes.slot, add(mul(newlength, 2), 1)) // Copy over the first `submod` bytes of the new data as in // case 1 above. let slengthmod := mod(slength, 32) let mlengthmod := mod(mlength, 32) let submod := sub(32, slengthmod) let mc := add(_postBytes, submod) let end := add(_postBytes, mlength) let mask := sub(exp(0x100, submod), 1) sstore(sc, add(sload(sc), and(mload(mc), mask))) for { sc := add(sc, 1) mc := add(mc, 0x20) } lt(mc, end) { sc := add(sc, 1) mc := add(mc, 0x20) } { sstore(sc, mload(mc)) } mask := exp(0x100, sub(mc, end)) sstore(sc, mul(div(mload(mc), mask), mask)) } } } function slice( bytes memory _bytes, uint256 _start, uint256 _length ) internal pure returns (bytes memory) { require(_length + 31 >= _length, "slice_overflow"); require(_bytes.length >= _start + _length, "slice_outOfBounds"); bytes memory tempBytes; assembly { switch iszero(_length) case 0 { // Get a location of some free memory and store it in tempBytes as // Solidity does for memory variables. tempBytes := mload(0x40) // The first word of the slice result is potentially a partial // word read from the original array. To read it, we calculate // the length of that partial word and start copying that many // bytes into the array. The first word we copy will start with // data we don't care about, but the last `lengthmod` bytes will // land at the beginning of the contents of the new array. When // we're done copying, we overwrite the full first word with // the actual length of the slice. let lengthmod := and(_length, 31) // The multiplication in the next line is necessary // because when slicing multiples of 32 bytes (lengthmod == 0) // the following copy loop was copying the origin's length // and then ending prematurely not copying everything it should. let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod))) let end := add(mc, _length) for { // The multiplication in the next line has the same exact purpose // as the one above. let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start) } lt(mc, end) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { mstore(mc, mload(cc)) } mstore(tempBytes, _length) //update free-memory pointer //allocating the array padded to 32 bytes like the compiler does now mstore(0x40, and(add(mc, 31), not(31))) } //if we want a zero-length slice let's just return a zero-length array default { tempBytes := mload(0x40) //zero out the 32 bytes slice we are about to return //we need to do it because Solidity does not garbage collect mstore(tempBytes, 0) mstore(0x40, add(tempBytes, 0x20)) } } return tempBytes; } function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) { require(_bytes.length >= _start + 20, "toAddress_outOfBounds"); address tempAddress; assembly { tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000) } return tempAddress; } function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8) { require(_bytes.length >= _start + 1 , "toUint8_outOfBounds"); uint8 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x1), _start)) } return tempUint; } function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) { require(_bytes.length >= _start + 2, "toUint16_outOfBounds"); uint16 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x2), _start)) } return tempUint; } function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) { require(_bytes.length >= _start + 4, "toUint32_outOfBounds"); uint32 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x4), _start)) } return tempUint; } function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) { require(_bytes.length >= _start + 8, "toUint64_outOfBounds"); uint64 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x8), _start)) } return tempUint; } function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) { require(_bytes.length >= _start + 12, "toUint96_outOfBounds"); uint96 tempUint; assembly { tempUint := mload(add(add(_bytes, 0xc), _start)) } return tempUint; } function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) { require(_bytes.length >= _start + 16, "toUint128_outOfBounds"); uint128 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x10), _start)) } return tempUint; } function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) { require(_bytes.length >= _start + 32, "toUint256_outOfBounds"); uint256 tempUint; assembly { tempUint := mload(add(add(_bytes, 0x20), _start)) } return tempUint; } function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) { require(_bytes.length >= _start + 32, "toBytes32_outOfBounds"); bytes32 tempBytes32; assembly { tempBytes32 := mload(add(add(_bytes, 0x20), _start)) } return tempBytes32; } function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) { bool success = true; assembly { let length := mload(_preBytes) // if lengths don't match the arrays are not equal switch eq(length, mload(_postBytes)) case 1 { // cb is a circuit breaker in the for loop since there's // no said feature for inline assembly loops // cb = 1 - don't breaker // cb = 0 - break let cb := 1 let mc := add(_preBytes, 0x20) let end := add(mc, length) for { let cc := add(_postBytes, 0x20) // the next line is the loop condition: // while(uint256(mc < end) + cb == 2) } eq(add(lt(mc, end), cb), 2) { mc := add(mc, 0x20) cc := add(cc, 0x20) } { // if any of these checks fails then arrays are not equal if iszero(eq(mload(mc), mload(cc))) { // unsuccess: success := 0 cb := 0 } } } default { // unsuccess: success := 0 } } return success; } function equalStorage( bytes storage _preBytes, bytes memory _postBytes ) internal view returns (bool) { bool success = true; assembly { // we know _preBytes_offset is 0 let fslot := sload(_preBytes.slot) // Decode the length of the stored array like in concatStorage(). let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) let mlength := mload(_postBytes) // if lengths don't match the arrays are not equal switch eq(slength, mlength) case 1 { // slength can contain both the length and contents of the array // if length < 32 bytes so let's prepare for that // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage if iszero(iszero(slength)) { switch lt(slength, 32) case 1 { // blank the last byte which is the length fslot := mul(div(fslot, 0x100), 0x100) if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) { // unsuccess: success := 0 } } default { // cb is a circuit breaker in the for loop since there's // no said feature for inline assembly loops // cb = 1 - don't breaker // cb = 0 - break let cb := 1 // get the keccak hash to get the contents of the array mstore(0x0, _preBytes.slot) let sc := keccak256(0x0, 0x20) let mc := add(_postBytes, 0x20) let end := add(mc, mlength) // the next line is the loop condition: // while(uint256(mc < end) + cb == 2) for {} eq(add(lt(mc, end), cb), 2) { sc := add(sc, 1) mc := add(mc, 0x20) } { if iszero(eq(sload(sc), mload(mc))) { // unsuccess: success := 0 cb := 0 } } } } } default { // unsuccess: success := 0 } } return success; } }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity >=0.7.6; library ExcessivelySafeCall { uint256 constant LOW_28_MASK = 0x00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff; /// @notice Use when you _really_ really _really_ don't trust the called /// contract. This prevents the called contract from causing reversion of /// the caller in as many ways as we can. /// @dev The main difference between this and a solidity low-level call is /// that we limit the number of bytes that the callee can cause to be /// copied to caller memory. This prevents stupid things like malicious /// contracts returning 10,000,000 bytes causing a local OOG when copying /// to memory. /// @param _target The address to call /// @param _gas The amount of gas to forward to the remote contract /// @param _maxCopy The maximum number of bytes of returndata to copy /// to memory. /// @param _calldata The data to send to the remote contract /// @return success and returndata, as `.call()`. Returndata is capped to /// `_maxCopy` bytes. function excessivelySafeCall( address _target, uint256 _gas, uint16 _maxCopy, bytes memory _calldata ) internal returns (bool, bytes memory) { // set up for assembly call uint256 _toCopy; bool _success; bytes memory _returnData = new bytes(_maxCopy); // dispatch message to recipient // by assembly calling "handle" function // we call via assembly to avoid memcopying a very large returndata // returned by a malicious contract assembly { _success := call( _gas, // gas _target, // recipient 0, // ether value add(_calldata, 0x20), // inloc mload(_calldata), // inlen 0, // outloc 0 // outlen ) // limit our copy to 256 bytes _toCopy := returndatasize() if gt(_toCopy, _maxCopy) { _toCopy := _maxCopy } // Store the length of the copied bytes mstore(_returnData, _toCopy) // copy the bytes from returndata[0:_toCopy] returndatacopy(add(_returnData, 0x20), 0, _toCopy) } return (_success, _returnData); } /// @notice Use when you _really_ really _really_ don't trust the called /// contract. This prevents the called contract from causing reversion of /// the caller in as many ways as we can. /// @dev The main difference between this and a solidity low-level call is /// that we limit the number of bytes that the callee can cause to be /// copied to caller memory. This prevents stupid things like malicious /// contracts returning 10,000,000 bytes causing a local OOG when copying /// to memory. /// @param _target The address to call /// @param _gas The amount of gas to forward to the remote contract /// @param _maxCopy The maximum number of bytes of returndata to copy /// to memory. /// @param _calldata The data to send to the remote contract /// @return success and returndata, as `.call()`. Returndata is capped to /// `_maxCopy` bytes. function excessivelySafeStaticCall( address _target, uint256 _gas, uint16 _maxCopy, bytes memory _calldata ) internal view returns (bool, bytes memory) { // set up for assembly call uint256 _toCopy; bool _success; bytes memory _returnData = new bytes(_maxCopy); // dispatch message to recipient // by assembly calling "handle" function // we call via assembly to avoid memcopying a very large returndata // returned by a malicious contract assembly { _success := staticcall( _gas, // gas _target, // recipient add(_calldata, 0x20), // inloc mload(_calldata), // inlen 0, // outloc 0 // outlen ) // limit our copy to 256 bytes _toCopy := returndatasize() if gt(_toCopy, _maxCopy) { _toCopy := _maxCopy } // Store the length of the copied bytes mstore(_returnData, _toCopy) // copy the bytes from returndata[0:_toCopy] returndatacopy(add(_returnData, 0x20), 0, _toCopy) } return (_success, _returnData); } /** * @notice Swaps function selectors in encoded contract calls * @dev Allows reuse of encoded calldata for functions with identical * argument types but different names. It simply swaps out the first 4 bytes * for the new selector. This function modifies memory in place, and should * only be used with caution. * @param _newSelector The new 4-byte selector * @param _buf The encoded contract args */ function swapSelector(bytes4 _newSelector, bytes memory _buf) internal pure { require(_buf.length >= 4); uint256 _mask = LOW_28_MASK; assembly { // load the first word of let _word := mload(add(_buf, 0x20)) // mask out the top 4 bytes // /x _word := and(_word, _mask) _word := or(_newSelector, _word) mstore(add(_buf, 0x20), _word) } } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : _minGasToTransfer (uint256): 150000
Arg [1] : _layerZeroEndpoint (address): 0x66A71Dcef29A0fFBDBE3c6a460a3B5BC225Cd675
Arg [2] : _startMintId (uint256): 1
Arg [3] : _maxMintId (uint256): 2450
Arg [4] : _whitelistStartPeriod (uint256): 1681488000
Arg [5] : _whitelistEndPeriod (uint256): 1681502400
Arg [6] : _merkleRoot (bytes32): 0xfd65f6d371265aa96eae58b1f890b5fbce83b66b58858a3d6de65fca6be7e14e
Arg [7] : _mintPrice (uint256): 50000000000000000
Arg [8] : _treasure (address): 0xb32D174C217a73594e3895AEEdF4096bA016B3eE
-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000249f0
Arg [1] : 00000000000000000000000066a71dcef29a0ffbdbe3c6a460a3b5bc225cd675
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000992
Arg [4] : 0000000000000000000000000000000000000000000000000000000064397880
Arg [5] : 000000000000000000000000000000000000000000000000000000006439b0c0
Arg [6] : fd65f6d371265aa96eae58b1f890b5fbce83b66b58858a3d6de65fca6be7e14e
Arg [7] : 00000000000000000000000000000000000000000000000000b1a2bc2ec50000
Arg [8] : 000000000000000000000000b32d174c217a73594e3895aeedf4096ba016b3ee
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