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{
"language": "Solidity",
"sources": {
"project.sol": {
"content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.6.6;\n\nimport \"ERC721A.sol\";\nimport \"Ownable.sol\";\nimport \"ReentrancyGuard.sol\";\nimport \"MerkleProof.sol\";\n\ncontract CanvasLand is Ownable, ERC721A, ReentrancyGuard {\n uint256 public maxSupply = 600;\n uint256 public maxMintPerTx = 10;\n uint256 public price = 0.01 * 10**18; //10000000000000000 = 0.01\n bytes32 public whitelistMerkleRoot =\n 0xfacea6609bad54cedb9b0e15b41eb669da44e6bbce0e3282eab035549d706471;\n bool public publicPaused = true;\n bool public revealed = false;\n string public baseURI;\n string public hiddenMetadataUri =\n \"ipfs://QmX8QScW6vj8nPsPNwf6PbynFqkWAovu9Ry7S1fHKPGie7\";\n\n constructor() public ERC721A(\"Canvas Land\", \"CANLAND\", 600, 600) {}\n\n function whitelistMint(uint256 amount, bytes32[] calldata _merkleProof)\n public\n payable\n {\n bytes32 leaf = keccak256(abi.encodePacked(msg.sender));\n uint256 ts = totalSupply();\n require(ts + amount <= maxSupply, \"Purchase would exceed max tokens\");\n\n require(\n MerkleProof.verify(_merkleProof, whitelistMerkleRoot, leaf),\n \"Invalid proof!\"\n );\n\n {\n _safeMint(msg.sender, amount);\n }\n }\n\n function mint(uint256 amount) external payable {\n uint256 ts = totalSupply();\n require(publicPaused == false, \"Mint not open for public\");\n require(ts + amount <= maxSupply, \"Purchase would exceed max tokens\");\n require(\n amount <= maxMintPerTx,\n \"Amount should not exceed max mint number\"\n );\n\n require(msg.value >= price * amount, \"Please send the exact amount.\");\n\n _safeMint(msg.sender, amount);\n }\n\n function setPublicPaused(bool paused) external onlyOwner {\n publicPaused = paused;\n }\n\n function setWhitelistMerkleRoot(bytes32 _merkleRoot) external onlyOwner {\n whitelistMerkleRoot = _merkleRoot;\n }\n\n function setPrice(uint256 _price) external onlyOwner {\n price = _price;\n }\n\n function setSupply(uint256 _maxSupply) external onlyOwner {\n maxSupply = _maxSupply;\n }\n\n function setMaxPerTx(uint256 _maxMintPerTx) external onlyOwner {\n maxMintPerTx = _maxMintPerTx;\n }\n\n function setRevealed(bool _state) public onlyOwner {\n revealed = _state;\n }\n\n function setBaseURI(string calldata newBaseURI) external onlyOwner {\n baseURI = newBaseURI;\n }\n\n function _baseURI() internal view override returns (string memory) {\n return baseURI;\n }\n\n function setHiddenMetadataUri(string memory _hiddenMetadataUri)\n public\n onlyOwner\n {\n hiddenMetadataUri = _hiddenMetadataUri;\n }\n\n function tokenURI(uint256 _tokenId)\n public\n view\n virtual\n override\n returns (string memory)\n {\n require(\n _exists(_tokenId),\n \"ERC721Metadata: URI query for nonexistent token\"\n );\n\n if (revealed == false) {\n return hiddenMetadataUri;\n }\n\n string memory currentBaseURI = _baseURI();\n return\n bytes(currentBaseURI).length > 0\n ? string(abi.encodePacked(currentBaseURI, _tokenId.toString()))\n : \"\";\n }\n\n function withdraw() external onlyOwner nonReentrant {\n (bool success, ) = msg.sender.call{value: address(this).balance}(\"\");\n require(success, \"Transfer failed.\");\n }\n}\n"
},
"ERC721A.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\nimport \"IERC721.sol\";\nimport \"IERC721Receiver.sol\";\nimport \"IERC721Metadata.sol\";\nimport \"IERC721Enumerable.sol\";\nimport \"Address.sol\";\nimport \"Context.sol\";\nimport \"Strings.sol\";\nimport \"ERC165.sol\";\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata and Enumerable extension. Built to optimize for lower gas during batch mints.\n *\n * Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).\n *\n * Assumes the number of issuable tokens (collection size) is capped and fits in a uint128.\n *\n * Does not support burning tokens to address(0).\n */\ncontract ERC721A is\n Context,\n ERC165,\n IERC721,\n IERC721Metadata,\n IERC721Enumerable\n{\n using Address for address;\n using Strings for uint256;\n\n struct TokenOwnership {\n address addr;\n uint64 startTimestamp;\n }\n\n struct AddressData {\n uint128 balance;\n uint128 numberMinted;\n }\n\n uint256 private currentIndex = 0;\n\n uint256 internal immutable collectionSize;\n uint256 internal immutable maxBatchSize;\n\n // Token name\n string private _name;\n\n // Token symbol\n string private _symbol;\n\n // Mapping from token ID to ownership details\n // An empty struct value does not necessarily mean the token is unowned. See ownershipOf implementation for details.\n mapping(uint256 => TokenOwnership) private _ownerships;\n\n // Mapping owner address to address data\n mapping(address => AddressData) private _addressData;\n\n // Mapping from token ID to approved address\n mapping(uint256 => address) private _tokenApprovals;\n\n // Mapping from owner to operator approvals\n mapping(address => mapping(address => bool)) private _operatorApprovals;\n\n /**\n * @dev\n * `maxBatchSize` refers to how much a minter can mint at a time.\n * `collectionSize_` refers to how many tokens are in the collection.\n */\n constructor(\n string memory name_,\n string memory symbol_,\n uint256 maxBatchSize_,\n uint256 collectionSize_\n ) public {\n require(\n collectionSize_ > 0,\n \"ERC721A: collection must have a nonzero supply\"\n );\n require(maxBatchSize_ > 0, \"ERC721A: max batch size must be nonzero\");\n _name = name_;\n _symbol = symbol_;\n maxBatchSize = maxBatchSize_;\n collectionSize = collectionSize_;\n }\n\n /**\n * @dev See {IERC721Enumerable-totalSupply}.\n */\n function totalSupply() public view override returns (uint256) {\n return currentIndex;\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenByIndex}.\n */\n function tokenByIndex(uint256 index)\n public\n view\n override\n returns (uint256)\n {\n require(index < totalSupply(), \"ERC721A: global index out of bounds\");\n return index;\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n * This read function is O(collectionSize). If calling from a separate contract, be sure to test gas first.\n * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.\n */\n function tokenOfOwnerByIndex(address owner, uint256 index)\n public\n view\n override\n returns (uint256)\n {\n require(index < balanceOf(owner), \"ERC721A: owner index out of bounds\");\n uint256 numMintedSoFar = totalSupply();\n uint256 tokenIdsIdx = 0;\n address currOwnershipAddr = address(0);\n for (uint256 i = 0; i < numMintedSoFar; i++) {\n TokenOwnership memory ownership = _ownerships[i];\n if (ownership.addr != address(0)) {\n currOwnershipAddr = ownership.addr;\n }\n if (currOwnershipAddr == owner) {\n if (tokenIdsIdx == index) {\n return i;\n }\n tokenIdsIdx++;\n }\n }\n revert(\"ERC721A: unable to get token of owner by index\");\n }\n\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId)\n public\n view\n virtual\n override(ERC165, IERC165)\n returns (bool)\n {\n return\n interfaceId == type(IERC721).interfaceId ||\n interfaceId == type(IERC721Metadata).interfaceId ||\n interfaceId == type(IERC721Enumerable).interfaceId ||\n super.supportsInterface(interfaceId);\n }\n\n /**\n * @dev See {IERC721-balanceOf}.\n */\n function balanceOf(address owner) public view override returns (uint256) {\n require(\n owner != address(0),\n \"ERC721A: balance query for the zero address\"\n );\n return uint256(_addressData[owner].balance);\n }\n\n function _numberMinted(address owner) internal view returns (uint256) {\n require(\n owner != address(0),\n \"ERC721A: number minted query for the zero address\"\n );\n return uint256(_addressData[owner].numberMinted);\n }\n\n function ownershipOf(uint256 tokenId)\n internal\n view\n returns (TokenOwnership memory)\n {\n require(_exists(tokenId), \"ERC721A: owner query for nonexistent token\");\n\n uint256 lowestTokenToCheck;\n if (tokenId >= maxBatchSize) {\n lowestTokenToCheck = tokenId - maxBatchSize + 1;\n }\n\n for (uint256 curr = tokenId; curr >= lowestTokenToCheck; curr--) {\n TokenOwnership memory ownership = _ownerships[curr];\n if (ownership.addr != address(0)) {\n return ownership;\n }\n }\n\n revert(\"ERC721A: unable to determine the owner of token\");\n }\n\n /**\n * @dev See {IERC721-ownerOf}.\n */\n function ownerOf(uint256 tokenId) public view override returns (address) {\n return ownershipOf(tokenId).addr;\n }\n\n /**\n * @dev See {IERC721Metadata-name}.\n */\n function name() public view virtual override returns (string memory) {\n return _name;\n }\n\n /**\n * @dev See {IERC721Metadata-symbol}.\n */\n function symbol() public view virtual override returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev See {IERC721Metadata-tokenURI}.\n */\n function tokenURI(uint256 tokenId)\n public\n view\n virtual\n override\n returns (string memory)\n {\n require(\n _exists(tokenId),\n \"ERC721Metadata: URI query for nonexistent token\"\n );\n\n string memory baseURI = _baseURI();\n return\n bytes(baseURI).length > 0\n ? string(abi.encodePacked(baseURI, tokenId.toString()))\n : \"\";\n }\n\n /**\n * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each\n * token will be the concatenation of the `baseURI` and the `tokenId`. Empty\n * by default, can be overriden in child contracts.\n */\n function _baseURI() internal view virtual returns (string memory) {\n return \"\";\n }\n\n /**\n * @dev See {IERC721-approve}.\n */\n function approve(address to, uint256 tokenId) public override {\n address owner = ERC721A.ownerOf(tokenId);\n require(to != owner, \"ERC721A: approval to current owner\");\n\n require(\n _msgSender() == owner || isApprovedForAll(owner, _msgSender()),\n \"ERC721A: approve caller is not owner nor approved for all\"\n );\n\n _approve(to, tokenId, owner);\n }\n\n /**\n * @dev See {IERC721-getApproved}.\n */\n function getApproved(uint256 tokenId)\n public\n view\n override\n returns (address)\n {\n require(\n _exists(tokenId),\n \"ERC721A: approved query for nonexistent token\"\n );\n\n return _tokenApprovals[tokenId];\n }\n\n /**\n * @dev See {IERC721-setApprovalForAll}.\n */\n function setApprovalForAll(address operator, bool approved)\n public\n override\n {\n require(operator != _msgSender(), \"ERC721A: approve to caller\");\n\n _operatorApprovals[_msgSender()][operator] = approved;\n emit ApprovalForAll(_msgSender(), operator, approved);\n }\n\n /**\n * @dev See {IERC721-isApprovedForAll}.\n */\n function isApprovedForAll(address owner, address operator)\n public\n view\n virtual\n override\n returns (bool)\n {\n return _operatorApprovals[owner][operator];\n }\n\n /**\n * @dev See {IERC721-transferFrom}.\n */\n function transferFrom(\n address from,\n address to,\n uint256 tokenId\n ) public override {\n _transfer(from, to, tokenId);\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId\n ) public override {\n safeTransferFrom(from, to, tokenId, \"\");\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId,\n bytes memory _data\n ) public override {\n _transfer(from, to, tokenId);\n require(\n _checkOnERC721Received(from, to, tokenId, _data),\n \"ERC721A: transfer to non ERC721Receiver implementer\"\n );\n }\n\n /**\n * @dev Returns whether `tokenId` exists.\n *\n * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\n *\n * Tokens start existing when they are minted (`_mint`),\n */\n function _exists(uint256 tokenId) internal view returns (bool) {\n return tokenId < currentIndex;\n }\n\n function _safeMint(address to, uint256 quantity) internal {\n _safeMint(to, quantity, \"\");\n }\n\n /**\n * @dev Mints `quantity` tokens and transfers them to `to`.\n *\n * Requirements:\n *\n * - there must be `quantity` tokens remaining unminted in the total collection.\n * - `to` cannot be the zero address.\n * - `quantity` cannot be larger than the max batch size.\n *\n * Emits a {Transfer} event.\n */\n function _safeMint(\n address to,\n uint256 quantity,\n bytes memory _data\n ) internal {\n uint256 startTokenId = currentIndex;\n require(to != address(0), \"ERC721A: mint to the zero address\");\n // We know if the first token in the batch doesn't exist, the other ones don't as well, because of serial ordering.\n require(!_exists(startTokenId), \"ERC721A: token already minted\");\n require(quantity <= maxBatchSize, \"ERC721A: quantity to mint too high\");\n\n _beforeTokenTransfers(address(0), to, startTokenId, quantity);\n\n AddressData memory addressData = _addressData[to];\n _addressData[to] = AddressData(\n addressData.balance + uint128(quantity),\n addressData.numberMinted + uint128(quantity)\n );\n _ownerships[startTokenId] = TokenOwnership(to, uint64(block.timestamp));\n\n uint256 updatedIndex = startTokenId;\n\n for (uint256 i = 0; i < quantity; i++) {\n emit Transfer(address(0), to, updatedIndex);\n require(\n _checkOnERC721Received(address(0), to, updatedIndex, _data),\n \"ERC721A: transfer to non ERC721Receiver implementer\"\n );\n updatedIndex++;\n }\n\n currentIndex = updatedIndex;\n _afterTokenTransfers(address(0), to, startTokenId, quantity);\n }\n\n /**\n * @dev Transfers `tokenId` from `from` to `to`.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n *\n * Emits a {Transfer} event.\n */\n function _transfer(\n address from,\n address to,\n uint256 tokenId\n ) private {\n TokenOwnership memory prevOwnership = ownershipOf(tokenId);\n\n bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||\n getApproved(tokenId) == _msgSender() ||\n isApprovedForAll(prevOwnership.addr, _msgSender()));\n\n require(\n isApprovedOrOwner,\n \"ERC721A: transfer caller is not owner nor approved\"\n );\n\n require(\n prevOwnership.addr == from,\n \"ERC721A: transfer from incorrect owner\"\n );\n require(to != address(0), \"ERC721A: transfer to the zero address\");\n\n _beforeTokenTransfers(from, to, tokenId, 1);\n\n // Clear approvals from the previous owner\n _approve(address(0), tokenId, prevOwnership.addr);\n\n _addressData[from].balance -= 1;\n _addressData[to].balance += 1;\n _ownerships[tokenId] = TokenOwnership(to, uint64(block.timestamp));\n\n // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.\n // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.\n uint256 nextTokenId = tokenId + 1;\n if (_ownerships[nextTokenId].addr == address(0)) {\n if (_exists(nextTokenId)) {\n _ownerships[nextTokenId] = TokenOwnership(\n prevOwnership.addr,\n prevOwnership.startTimestamp\n );\n }\n }\n\n emit Transfer(from, to, tokenId);\n _afterTokenTransfers(from, to, tokenId, 1);\n }\n\n /**\n * @dev Approve `to` to operate on `tokenId`\n *\n * Emits a {Approval} event.\n */\n function _approve(\n address to,\n uint256 tokenId,\n address owner\n ) private {\n _tokenApprovals[tokenId] = to;\n emit Approval(owner, to, tokenId);\n }\n\n uint256 public nextOwnerToExplicitlySet = 0;\n\n /**\n * @dev Explicitly set `owners` to eliminate loops in future calls of ownerOf().\n */\n function _setOwnersExplicit(uint256 quantity) internal {\n uint256 oldNextOwnerToSet = nextOwnerToExplicitlySet;\n require(quantity > 0, \"quantity must be nonzero\");\n uint256 endIndex = oldNextOwnerToSet + quantity - 1;\n if (endIndex > collectionSize - 1) {\n endIndex = collectionSize - 1;\n }\n // We know if the last one in the group exists, all in the group exist, due to serial ordering.\n require(_exists(endIndex), \"not enough minted yet for this cleanup\");\n for (uint256 i = oldNextOwnerToSet; i <= endIndex; i++) {\n if (_ownerships[i].addr == address(0)) {\n TokenOwnership memory ownership = ownershipOf(i);\n _ownerships[i] = TokenOwnership(\n ownership.addr,\n ownership.startTimestamp\n );\n }\n }\n nextOwnerToExplicitlySet = endIndex + 1;\n }\n\n /**\n * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.\n * The call is not executed if the target address is not a contract.\n *\n * @param from address representing the previous owner of the given token ID\n * @param to target address that will receive the tokens\n * @param tokenId uint256 ID of the token to be transferred\n * @param _data bytes optional data to send along with the call\n * @return bool whether the call correctly returned the expected magic value\n */\n function _checkOnERC721Received(\n address from,\n address to,\n uint256 tokenId,\n bytes memory _data\n ) private returns (bool) {\n if (to.isContract()) {\n try\n IERC721Receiver(to).onERC721Received(\n _msgSender(),\n from,\n tokenId,\n _data\n )\n returns (bytes4 retval) {\n return retval == IERC721Receiver(to).onERC721Received.selector;\n } catch (bytes memory reason) {\n if (reason.length == 0) {\n revert(\n \"ERC721A: transfer to non ERC721Receiver implementer\"\n );\n } else {\n assembly {\n revert(add(32, reason), mload(reason))\n }\n }\n }\n } else {\n return true;\n }\n }\n\n /**\n * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.\n *\n * startTokenId - the first token id to be transferred\n * quantity - the amount to be transferred\n *\n * Calling conditions:\n *\n * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\n * transferred to `to`.\n * - When `from` is zero, `tokenId` will be minted for `to`.\n */\n function _beforeTokenTransfers(\n address from,\n address to,\n uint256 startTokenId,\n uint256 quantity\n ) internal virtual {}\n\n /**\n * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes\n * minting.\n *\n * startTokenId - the first token id to be transferred\n * quantity - the amount to be transferred\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero.\n * - `from` and `to` are never both zero.\n */\n function _afterTokenTransfers(\n address from,\n address to,\n uint256 startTokenId,\n uint256 quantity\n ) internal virtual {}\n}\n"
},
"IERC721.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.2 <0.8.0;\n\nimport \"IERC165.sol\";\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n /**\n * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n */\n event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n /**\n * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n */\n event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n /**\n * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n */\n event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\n\n /**\n * @dev Returns the number of tokens in ``owner``'s account.\n */\n function balanceOf(address owner) external view returns (uint256 balance);\n\n /**\n * @dev Returns the owner of the `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function ownerOf(uint256 tokenId) external view returns (address owner);\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId) external;\n\n /**\n * @dev Transfers `tokenId` token from `from` to `to`.\n *\n * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(address from, address to, uint256 tokenId) external;\n\n /**\n * @dev Gives permission to `to` to transfer `tokenId` token to another account.\n * The approval is cleared when the token is transferred.\n *\n * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\n *\n * Requirements:\n *\n * - The caller must own the token or be an approved operator.\n * - `tokenId` must exist.\n *\n * Emits an {Approval} event.\n */\n function approve(address to, uint256 tokenId) external;\n\n /**\n * @dev Returns the account approved for `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function getApproved(uint256 tokenId) external view returns (address operator);\n\n /**\n * @dev Approve or remove `operator` as an operator for the caller.\n * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\n *\n * Requirements:\n *\n * - The `operator` cannot be the caller.\n *\n * Emits an {ApprovalForAll} event.\n */\n function setApprovalForAll(address operator, bool _approved) external;\n\n /**\n * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n *\n * See {setApprovalForAll}\n */\n function isApprovedForAll(address owner, address operator) external view returns (bool);\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;\n}\n"
},
"IERC165.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n /**\n * @dev Returns true if this contract implements the interface defined by\n * `interfaceId`. See the corresponding\n * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n * to learn more about how these ids are created.\n *\n * This function call must use less than 30 000 gas.\n */\n function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n"
},
"IERC721Receiver.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n /**\n * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n * by `operator` from `from`, this function is called.\n *\n * It must return its Solidity selector to confirm the token transfer.\n * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.\n *\n * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.\n */\n function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);\n}\n"
},
"IERC721Metadata.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.2 <0.8.0;\n\nimport \"IERC721.sol\";\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional metadata extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Metadata is IERC721 {\n\n /**\n * @dev Returns the token collection name.\n */\n function name() external view returns (string memory);\n\n /**\n * @dev Returns the token collection symbol.\n */\n function symbol() external view returns (string memory);\n\n /**\n * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.\n */\n function tokenURI(uint256 tokenId) external view returns (string memory);\n}\n"
},
"IERC721Enumerable.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.2 <0.8.0;\n\nimport \"IERC721.sol\";\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Enumerable is IERC721 {\n\n /**\n * @dev Returns the total amount of tokens stored by the contract.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns a token ID owned by `owner` at a given `index` of its token list.\n * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.\n */\n function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);\n\n /**\n * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.\n * Use along with {totalSupply} to enumerate all tokens.\n */\n function tokenByIndex(uint256 index) external view returns (uint256);\n}\n"
},
"Address.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.2 <0.8.0;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n /**\n * @dev Returns true if `account` is a contract.\n *\n * [IMPORTANT]\n * ====\n * It is unsafe to assume that an address for which this function returns\n * false is an externally-owned account (EOA) and not a contract.\n *\n * Among others, `isContract` will return false for the following\n * types of addresses:\n *\n * - an externally-owned account\n * - a contract in construction\n * - an address where a contract will be created\n * - an address where a contract lived, but was destroyed\n * ====\n */\n function isContract(address account) internal view returns (bool) {\n // This method relies on extcodesize, which returns 0 for contracts in\n // construction, since the code is only stored at the end of the\n // constructor execution.\n\n uint256 size;\n // solhint-disable-next-line no-inline-assembly\n assembly { size := extcodesize(account) }\n return size > 0;\n }\n\n /**\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n * `recipient`, forwarding all available gas and reverting on errors.\n *\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\n * imposed by `transfer`, making them unable to receive funds via\n * `transfer`. {sendValue} removes this limitation.\n *\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n *\n * IMPORTANT: because control is transferred to `recipient`, care must be\n * taken to not create reentrancy vulnerabilities. Consider using\n * {ReentrancyGuard} or the\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n */\n function sendValue(address payable recipient, uint256 amount) internal {\n require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\n (bool success, ) = recipient.call{ value: amount }(\"\");\n require(success, \"Address: unable to send value, recipient may have reverted\");\n }\n\n /**\n * @dev Performs a Solidity function call using a low level `call`. A\n * plain`call` is an unsafe replacement for a function call: use this\n * function instead.\n *\n * If `target` reverts with a revert reason, it is bubbled up by this\n * function (like regular Solidity function calls).\n *\n * Returns the raw returned data. To convert to the expected return value,\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n *\n * Requirements:\n *\n * - `target` must be a contract.\n * - calling `target` with `data` must not revert.\n *\n * _Available since v3.1._\n */\n function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionCall(target, data, \"Address: low-level call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n * `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n return functionCallWithValue(target, data, 0, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but also transferring `value` wei to `target`.\n *\n * Requirements:\n *\n * - the calling contract must have an ETH balance of at least `value`.\n * - the called Solidity function must be `payable`.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n * with `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\n require(isContract(target), \"Address: call to non-contract\");\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = target.call{ value: value }(data);\n return _verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n return functionStaticCall(target, data, \"Address: low-level static call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {\n require(isContract(target), \"Address: static call to non-contract\");\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = target.staticcall(data);\n return _verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n require(isContract(target), \"Address: delegate call to non-contract\");\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = target.delegatecall(data);\n return _verifyCallResult(success, returndata, errorMessage);\n }\n\n function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {\n if (success) {\n return returndata;\n } else {\n // Look for revert reason and bubble it up if present\n if (returndata.length > 0) {\n // The easiest way to bubble the revert reason is using memory via assembly\n\n // solhint-disable-next-line no-inline-assembly\n assembly {\n let returndata_size := mload(returndata)\n revert(add(32, returndata), returndata_size)\n }\n } else {\n revert(errorMessage);\n }\n }\n }\n}\n"
},
"Context.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/*\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with GSN meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n function _msgSender() internal view virtual returns (address payable) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes memory) {\n this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n return msg.data;\n }\n}\n"
},
"Strings.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n /**\n * @dev Converts a `uint256` to its ASCII `string` representation.\n */\n function toString(uint256 value) internal pure returns (string memory) {\n // Inspired by OraclizeAPI's implementation - MIT licence\n // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\n\n if (value == 0) {\n return \"0\";\n }\n uint256 temp = value;\n uint256 digits;\n while (temp != 0) {\n digits++;\n temp /= 10;\n }\n bytes memory buffer = new bytes(digits);\n uint256 index = digits - 1;\n temp = value;\n while (temp != 0) {\n buffer[index--] = bytes1(uint8(48 + temp % 10));\n temp /= 10;\n }\n return string(buffer);\n }\n}\n"
},
"ERC165.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\nimport \"IERC165.sol\";\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts may inherit from this and call {_registerInterface} to declare\n * their support of an interface.\n */\nabstract contract ERC165 is IERC165 {\n /*\n * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7\n */\n bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;\n\n /**\n * @dev Mapping of interface ids to whether or not it's supported.\n */\n mapping(bytes4 => bool) private _supportedInterfaces;\n\n constructor () internal {\n // Derived contracts need only register support for their own interfaces,\n // we register support for ERC165 itself here\n _registerInterface(_INTERFACE_ID_ERC165);\n }\n\n /**\n * @dev See {IERC165-supportsInterface}.\n *\n * Time complexity O(1), guaranteed to always use less than 30 000 gas.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n return _supportedInterfaces[interfaceId];\n }\n\n /**\n * @dev Registers the contract as an implementer of the interface defined by\n * `interfaceId`. Support of the actual ERC165 interface is automatic and\n * registering its interface id is not required.\n *\n * See {IERC165-supportsInterface}.\n *\n * Requirements:\n *\n * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).\n */\n function _registerInterface(bytes4 interfaceId) internal virtual {\n require(interfaceId != 0xffffffff, \"ERC165: invalid interface id\");\n _supportedInterfaces[interfaceId] = true;\n }\n}\n"
},
"Ownable.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\nimport \"Context.sol\";\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n address private _owner;\n\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Initializes the contract setting the deployer as the initial owner.\n */\n constructor () internal {\n address msgSender = _msgSender();\n _owner = msgSender;\n emit OwnershipTransferred(address(0), msgSender);\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view virtual returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n _;\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions anymore. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby removing any functionality that is only available to the owner.\n */\n function renounceOwnership() public virtual onlyOwner {\n emit OwnershipTransferred(_owner, address(0));\n _owner = address(0);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual onlyOwner {\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n emit OwnershipTransferred(_owner, newOwner);\n _owner = newOwner;\n }\n}\n"
},
"ReentrancyGuard.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n // Booleans are more expensive than uint256 or any type that takes up a full\n // word because each write operation emits an extra SLOAD to first read the\n // slot's contents, replace the bits taken up by the boolean, and then write\n // back. This is the compiler's defense against contract upgrades and\n // pointer aliasing, and it cannot be disabled.\n\n // The values being non-zero value makes deployment a bit more expensive,\n // but in exchange the refund on every call to nonReentrant will be lower in\n // amount. Since refunds are capped to a percentage of the total\n // transaction's gas, it is best to keep them low in cases like this one, to\n // increase the likelihood of the full refund coming into effect.\n uint256 private constant _NOT_ENTERED = 1;\n uint256 private constant _ENTERED = 2;\n\n uint256 private _status;\n\n constructor () internal {\n _status = _NOT_ENTERED;\n }\n\n /**\n * @dev Prevents a contract from calling itself, directly or indirectly.\n * Calling a `nonReentrant` function from another `nonReentrant`\n * function is not supported. It is possible to prevent this from happening\n * by making the `nonReentrant` function external, and make it call a\n * `private` function that does the actual work.\n */\n modifier nonReentrant() {\n // On the first call to nonReentrant, _notEntered will be true\n require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n // Any calls to nonReentrant after this point will fail\n _status = _ENTERED;\n\n _;\n\n // By storing the original value once again, a refund is triggered (see\n // https://eips.ethereum.org/EIPS/eip-2200)\n _status = _NOT_ENTERED;\n }\n}\n"
},
"MerkleProof.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/**\n * @dev These functions deal with verification of Merkle trees (hash trees),\n */\nlibrary MerkleProof {\n /**\n * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree\n * defined by `root`. For this, a `proof` must be provided, containing\n * sibling hashes on the branch from the leaf to the root of the tree. Each\n * pair of leaves and each pair of pre-images are assumed to be sorted.\n */\n function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {\n bytes32 computedHash = leaf;\n\n for (uint256 i = 0; i < proof.length; i++) {\n bytes32 proofElement = proof[i];\n\n if (computedHash <= proofElement) {\n // Hash(current computed hash + current element of the proof)\n computedHash = keccak256(abi.encodePacked(computedHash, proofElement));\n } else {\n // Hash(current element of the proof + current computed hash)\n computedHash = keccak256(abi.encodePacked(proofElement, computedHash));\n }\n }\n\n // Check if the computed hash (root) is equal to the provided root\n return computedHash == root;\n }\n}\n"
}
},
"settings": {
"evmVersion": "istanbul",
"optimizer": {
"enabled": true,
"runs": 200
},
"libraries": {
"project.sol": {}
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
}
}
} |