73 lines
75 KiB
JSON
73 lines
75 KiB
JSON
{
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"language": "Solidity",
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"sources": {
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"@openzeppelin/contracts/token/ERC721/ERC721.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/ERC721.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC721.sol\";\nimport \"./IERC721Receiver.sol\";\nimport \"./extensions/IERC721Metadata.sol\";\nimport \"../../utils/Address.sol\";\nimport \"../../utils/Context.sol\";\nimport \"../../utils/Strings.sol\";\nimport \"../../utils/introspection/ERC165.sol\";\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata extension, but not including the Enumerable extension, which is available separately as\n * {ERC721Enumerable}.\n */\ncontract ERC721 is Context, ERC165, IERC721, IERC721Metadata {\n using Address for address;\n using Strings for uint256;\n\n // Token name\n string private _name;\n\n // Token symbol\n string private _symbol;\n\n // Mapping from token ID to owner address\n mapping(uint256 => address) private _owners;\n\n // Mapping owner address to token count\n mapping(address => uint256) private _balances;\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 Initializes the contract by setting a `name` and a `symbol` to the token collection.\n */\n constructor(string memory name_, string memory symbol_) {\n _name = name_;\n _symbol = symbol_;\n }\n\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\n return\n interfaceId == type(IERC721).interfaceId ||\n interfaceId == type(IERC721Metadata).interfaceId ||\n super.supportsInterface(interfaceId);\n }\n\n /**\n * @dev See {IERC721-balanceOf}.\n */\n function balanceOf(address owner) public view virtual override returns (uint256) {\n require(owner != address(0), \"ERC721: address zero is not a valid owner\");\n return _balances[owner];\n }\n\n /**\n * @dev See {IERC721-ownerOf}.\n */\n function ownerOf(uint256 tokenId) public view virtual override returns (address) {\n address owner = _ownerOf(tokenId);\n require(owner != address(0), \"ERC721: invalid token ID\");\n return owner;\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) public view virtual override returns (string memory) {\n _requireMinted(tokenId);\n\n string memory baseURI = _baseURI();\n return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : \"\";\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 overridden 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 virtual override {\n address owner = ERC721.ownerOf(tokenId);\n require(to != owner, \"ERC721: approval to current owner\");\n\n require(\n _msgSender() == owner || isApprovedForAll(owner, _msgSender()),\n \"ERC721: approve caller is not token owner or approved for all\"\n );\n\n _approve(to, tokenId);\n }\n\n /**\n * @dev See {IERC721-getApproved}.\n */\n function getApproved(uint256 tokenId) public view virtual override returns (address) {\n _requireMinted(tokenId);\n\n return _tokenApprovals[tokenId];\n }\n\n /**\n * @dev See {IERC721-setApprovalForAll}.\n */\n function setApprovalForAll(address operator, bool approved) public virtual override {\n _setApprovalForAll(_msgSender(), operator, approved);\n }\n\n /**\n * @dev See {IERC721-isApprovedForAll}.\n */\n function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {\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 virtual override {\n //solhint-disable-next-line max-line-length\n require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: caller is not token owner or approved\");\n\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 virtual 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 virtual override {\n require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: caller is not token owner or approved\");\n _safeTransfer(from, to, tokenId, data);\n }\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 * `data` is additional data, it has no specified format and it is sent in call to `to`.\n *\n * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\n * implement alternative mechanisms to perform token transfer, such as signature-based.\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 `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 _safeTransfer(\n address from,\n address to,\n uint256 tokenId,\n bytes memory data\n ) internal virtual {\n _transfer(from, to, tokenId);\n require(_checkOnERC721Received(from, to, tokenId, data), \"ERC721: transfer to non ERC721Receiver implementer\");\n }\n\n /**\n * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist\n */\n function _ownerOf(uint256 tokenId) internal view virtual returns (address) {\n return _owners[tokenId];\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 * and stop existing when they are burned (`_burn`).\n */\n function _exists(uint256 tokenId) internal view virtual returns (bool) {\n return _ownerOf(tokenId) != address(0);\n }\n\n /**\n * @dev Returns whether `spender` is allowed to manage `tokenId`.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {\n address owner = ERC721.ownerOf(tokenId);\n return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);\n }\n\n /**\n * @dev Safely mints `tokenId` and transfers it to `to`.\n *\n * Requirements:\n *\n * - `tokenId` must not exist.\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 _safeMint(address to, uint256 tokenId) internal virtual {\n _safeMint(to, tokenId, \"\");\n }\n\n /**\n * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n */\n function _safeMint(\n address to,\n uint256 tokenId,\n bytes memory data\n ) internal virtual {\n _mint(to, tokenId);\n require(\n _checkOnERC721Received(address(0), to, tokenId, data),\n \"ERC721: transfer to non ERC721Receiver implementer\"\n );\n }\n\n /**\n * @dev Mints `tokenId` and transfers it to `to`.\n *\n * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n *\n * Requirements:\n *\n * - `tokenId` must not exist.\n * - `to` cannot be the zero address.\n *\n * Emits a {Transfer} event.\n */\n function _mint(address to, uint256 tokenId) internal virtual {\n require(to != address(0), \"ERC721: mint to the zero address\");\n require(!_exists(tokenId), \"ERC721: token already minted\");\n\n _beforeTokenTransfer(address(0), to, tokenId, 1);\n\n // Check that tokenId was not minted by `_beforeTokenTransfer` hook\n require(!_exists(tokenId), \"ERC721: token already minted\");\n\n unchecked {\n // Will not overflow unless all 2**256 token ids are minted to the same owner.\n // Given that tokens are minted one by one, it is impossible in practice that\n // this ever happens. Might change if we allow batch minting.\n // The ERC fails to describe this case.\n _balances[to] += 1;\n }\n\n _owners[tokenId] = to;\n\n emit Transfer(address(0), to, tokenId);\n\n _afterTokenTransfer(address(0), to, tokenId, 1);\n }\n\n /**\n * @dev Destroys `tokenId`.\n * The approval is cleared when the token is burned.\n * This is an internal function that does not check if the sender is authorized to operate on the token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n *\n * Emits a {Transfer} event.\n */\n function _burn(uint256 tokenId) internal virtual {\n address owner = ERC721.ownerOf(tokenId);\n\n _beforeTokenTransfer(owner, address(0), tokenId, 1);\n\n // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook\n owner = ERC721.ownerOf(tokenId);\n\n // Clear approvals\n delete _tokenApprovals[tokenId];\n\n unchecked {\n // Cannot overflow, as that would require more tokens to be burned/transferred\n // out than the owner initially received through minting and transferring in.\n _balances[owner] -= 1;\n }\n delete _owners[tokenId];\n\n emit Transfer(owner, address(0), tokenId);\n\n _afterTokenTransfer(owner, address(0), tokenId, 1);\n }\n\n /**\n * @dev Transfers `tokenId` from `from` to `to`.\n * As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\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 ) internal virtual {\n require(ERC721.ownerOf(tokenId) == from, \"ERC721: transfer from incorrect owner\");\n require(to != address(0), \"ERC721: transfer to the zero address\");\n\n _beforeTokenTransfer(from, to, tokenId, 1);\n\n // Check that tokenId was not transferred by `_beforeTokenTransfer` hook\n require(ERC721.ownerOf(tokenId) == from, \"ERC721: transfer from incorrect owner\");\n\n // Clear approvals from the previous owner\n delete _tokenApprovals[tokenId];\n\n unchecked {\n // `_balances[from]` cannot overflow for the same reason as described in `_burn`:\n // `from`'s balance is the number of token held, which is at least one before the current\n // transfer.\n // `_balances[to]` could overflow in the conditions described in `_mint`. That would require\n // all 2**256 token ids to be minted, which in practice is impossible.\n _balances[from] -= 1;\n _balances[to] += 1;\n }\n _owners[tokenId] = to;\n\n emit Transfer(from, to, tokenId);\n\n _afterTokenTransfer(from, to, tokenId, 1);\n }\n\n /**\n * @dev Approve `to` to operate on `tokenId`\n *\n * Emits an {Approval} event.\n */\n function _approve(address to, uint256 tokenId) internal virtual {\n _tokenApprovals[tokenId] = to;\n emit Approval(ERC721.ownerOf(tokenId), to, tokenId);\n }\n\n /**\n * @dev Approve `operator` to operate on all of `owner` tokens\n *\n * Emits an {ApprovalForAll} event.\n */\n function _setApprovalForAll(\n address owner,\n address operator,\n bool approved\n ) internal virtual {\n require(owner != operator, \"ERC721: approve to caller\");\n _operatorApprovals[owner][operator] = approved;\n emit ApprovalForAll(owner, operator, approved);\n }\n\n /**\n * @dev Reverts if the `tokenId` has not been minted yet.\n */\n function _requireMinted(uint256 tokenId) internal view virtual {\n require(_exists(tokenId), \"ERC721: invalid token ID\");\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 IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {\n return retval == IERC721Receiver.onERC721Received.selector;\n } catch (bytes memory reason) {\n if (reason.length == 0) {\n revert(\"ERC721: transfer to non ERC721Receiver implementer\");\n } else {\n /// @solidity memory-safe-assembly\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 any token transfer. This includes minting and burning. If {ERC721Consecutive} is\n * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.\n *\n * Calling conditions:\n *\n * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.\n * - When `from` is zero, the tokens will be minted for `to`.\n * - When `to` is zero, ``from``'s tokens will be burned.\n * - `from` and `to` are never both zero.\n * - `batchSize` is non-zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _beforeTokenTransfer(\n address from,\n address to,\n uint256, /* firstTokenId */\n uint256 batchSize\n ) internal virtual {\n if (batchSize > 1) {\n if (from != address(0)) {\n _balances[from] -= batchSize;\n }\n if (to != address(0)) {\n _balances[to] += batchSize;\n }\n }\n }\n\n /**\n * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is\n * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.\n *\n * Calling conditions:\n *\n * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.\n * - When `from` is zero, the tokens were minted for `to`.\n * - When `to` is zero, ``from``'s tokens were burned.\n * - `from` and `to` are never both zero.\n * - `batchSize` is non-zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _afterTokenTransfer(\n address from,\n address to,\n uint256 firstTokenId,\n uint256 batchSize\n ) internal virtual {}\n}\n"
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"@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)\n\npragma solidity ^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 * @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"
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"@openzeppelin/contracts/token/ERC721/IERC721.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../../utils/introspection/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`.\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(\n address from,\n address to,\n uint256 tokenId,\n bytes calldata data\n ) external;\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 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(\n address from,\n address to,\n uint256 tokenId\n ) external;\n\n /**\n * @dev Transfers `tokenId` token from `from` to `to`.\n *\n * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721\n * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must\n * understand this adds an external call which potentially creates a reentrancy vulnerability.\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(\n address from,\n address to,\n uint256 tokenId\n ) 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 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 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 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"
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"@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)\n\npragma solidity ^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 `IERC721Receiver.onERC721Received.selector`.\n */\n function onERC721Received(\n address operator,\n address from,\n uint256 tokenId,\n bytes calldata data\n ) external returns (bytes4);\n}\n"
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"@openzeppelin/contracts/utils/Address.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\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 * [IMPORTANT]\n * ====\n * You shouldn't rely on `isContract` to protect against flash loan attacks!\n *\n * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n * constructor.\n * ====\n */\n function isContract(address account) internal view returns (bool) {\n // This method relies on extcodesize/address.code.length, which returns 0\n // for contracts in construction, since the code is only stored at the end\n // of the constructor execution.\n\n return account.code.length > 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 (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 functionCallWithValue(target, data, 0, \"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(\n address target,\n bytes memory data,\n string memory errorMessage\n ) 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(\n address target,\n bytes memory data,\n uint256 value\n ) 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(\n address target,\n bytes memory data,\n uint256 value,\n string memory errorMessage\n ) internal returns (bytes memory) {\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\n (bool success, bytes memory returndata) = target.call{value: value}(data);\n return verifyCallResultFromTarget(target, 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(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal view returns (bytes memory) {\n (bool success, bytes memory returndata) = target.staticcall(data);\n return verifyCallResultFromTarget(target, 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(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal returns (bytes memory) {\n (bool success, bytes memory returndata) = target.delegatecall(data);\n return verifyCallResultFromTarget(target, success, returndata, errorMessage);\n }\n\n /**\n * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling\n * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.\n *\n * _Available since v4.8._\n */\n function verifyCallResultFromTarget(\n address target,\n bool success,\n bytes memory returndata,\n string memory errorMessage\n ) internal view returns (bytes memory) {\n if (success) {\n if (returndata.length == 0) {\n // only check isContract if the call was successful and the return data is empty\n // otherwise we already know that it was a contract\n require(isContract(target), \"Address: call to non-contract\");\n }\n return returndata;\n } else {\n _revert(returndata, errorMessage);\n }\n }\n\n /**\n * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the\n * revert reason or using the provided one.\n *\n * _Available since v4.3._\n */\n function verifyCallResult(\n bool success,\n bytes memory returndata,\n string memory errorMessage\n ) internal pure returns (bytes memory) {\n if (success) {\n return returndata;\n } else {\n _revert(returndata, errorMessage);\n }\n }\n\n function _revert(bytes memory returndata, string memory errorMessage) private pure {\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 /// @solidity memory-safe-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"
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},
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"@openzeppelin/contracts/utils/Base64.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (utils/Base64.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides a set of functions to operate with Base64 strings.\n *\n * _Available since v4.5._\n */\nlibrary Base64 {\n /**\n * @dev Base64 Encoding/Decoding Table\n */\n string internal constant _TABLE = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\";\n\n /**\n * @dev Converts a `bytes` to its Bytes64 `string` representation.\n */\n function encode(bytes memory data) internal pure returns (string memory) {\n /**\n * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence\n * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol\n */\n if (data.length == 0) return \"\";\n\n // Loads the table into memory\n string memory table = _TABLE;\n\n // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter\n // and split into 4 numbers of 6 bits.\n // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up\n // - `data.length + 2` -> Round up\n // - `/ 3` -> Number of 3-bytes chunks\n // - `4 *` -> 4 characters for each chunk\n string memory result = new string(4 * ((data.length + 2) / 3));\n\n /// @solidity memory-safe-assembly\n assembly {\n // Prepare the lookup table (skip the first \"length\" byte)\n let tablePtr := add(table, 1)\n\n // Prepare result pointer, jump over length\n let resultPtr := add(result, 32)\n\n // Run over the input, 3 bytes at a time\n for {\n let dataPtr := data\n let endPtr := add(data, mload(data))\n } lt(dataPtr, endPtr) {\n\n } {\n // Advance 3 bytes\n dataPtr := add(dataPtr, 3)\n let input := mload(dataPtr)\n\n // To write each character, shift the 3 bytes (18 bits) chunk\n // 4 times in blocks of 6 bits for each character (18, 12, 6, 0)\n // and apply logical AND with 0x3F which is the number of\n // the previous character in the ASCII table prior to the Base64 Table\n // The result is then added to the table to get the character to write,\n // and finally write it in the result pointer but with a left shift\n // of 256 (1 byte) - 8 (1 ASCII char) = 248 bits\n\n mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))\n resultPtr := add(resultPtr, 1) // Advance\n\n mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))\n resultPtr := add(resultPtr, 1) // Advance\n\n mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))\n resultPtr := add(resultPtr, 1) // Advance\n\n mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))\n resultPtr := add(resultPtr, 1) // Advance\n }\n\n // When data `bytes` is not exactly 3 bytes long\n // it is padded with `=` characters at the end\n switch mod(mload(data), 3)\n case 1 {\n mstore8(sub(resultPtr, 1), 0x3d)\n mstore8(sub(resultPtr, 2), 0x3d)\n }\n case 2 {\n mstore8(sub(resultPtr, 1), 0x3d)\n }\n }\n\n return result;\n }\n}\n"
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},
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"@openzeppelin/contracts/utils/Context.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^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 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) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes calldata) {\n return msg.data;\n }\n}\n"
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},
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"@openzeppelin/contracts/utils/Counters.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @title Counters\n * @author Matt Condon (@shrugs)\n * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number\n * of elements in a mapping, issuing ERC721 ids, or counting request ids.\n *\n * Include with `using Counters for Counters.Counter;`\n */\nlibrary Counters {\n struct Counter {\n // This variable should never be directly accessed by users of the library: interactions must be restricted to\n // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add\n // this feature: see https://github.com/ethereum/solidity/issues/4637\n uint256 _value; // default: 0\n }\n\n function current(Counter storage counter) internal view returns (uint256) {\n return counter._value;\n }\n\n function increment(Counter storage counter) internal {\n unchecked {\n counter._value += 1;\n }\n }\n\n function decrement(Counter storage counter) internal {\n uint256 value = counter._value;\n require(value > 0, \"Counter: decrement overflow\");\n unchecked {\n counter._value = value - 1;\n }\n }\n\n function reset(Counter storage counter) internal {\n counter._value = 0;\n }\n}\n"
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},
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"@openzeppelin/contracts/utils/introspection/ERC165.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC165.sol\";\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\n * }\n * ```\n *\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\n */\nabstract contract ERC165 is IERC165 {\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n return interfaceId == type(IERC165).interfaceId;\n }\n}\n"
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},
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"@openzeppelin/contracts/utils/introspection/IERC165.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)\n\npragma solidity ^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"
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},
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"@openzeppelin/contracts/utils/math/Math.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n enum Rounding {\n Down, // Toward negative infinity\n Up, // Toward infinity\n Zero // Toward zero\n }\n\n /**\n * @dev Returns the largest of two numbers.\n */\n function max(uint256 a, uint256 b) internal pure returns (uint256) {\n return a > b ? a : b;\n }\n\n /**\n * @dev Returns the smallest of two numbers.\n */\n function min(uint256 a, uint256 b) internal pure returns (uint256) {\n return a < b ? a : b;\n }\n\n /**\n * @dev Returns the average of two numbers. The result is rounded towards\n * zero.\n */\n function average(uint256 a, uint256 b) internal pure returns (uint256) {\n // (a + b) / 2 can overflow.\n return (a & b) + (a ^ b) / 2;\n }\n\n /**\n * @dev Returns the ceiling of the division of two numbers.\n *\n * This differs from standard division with `/` in that it rounds up instead\n * of rounding down.\n */\n function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {\n // (a + b - 1) / b can overflow on addition, so we distribute.\n return a == 0 ? 0 : (a - 1) / b + 1;\n }\n\n /**\n * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0\n * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)\n * with further edits by Uniswap Labs also under MIT license.\n */\n function mulDiv(\n uint256 x,\n uint256 y,\n uint256 denominator\n ) internal pure returns (uint256 result) {\n unchecked {\n // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use\n // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256\n // variables such that product = prod1 * 2^256 + prod0.\n uint256 prod0; // Least significant 256 bits of the product\n uint256 prod1; // Most significant 256 bits of the product\n assembly {\n let mm := mulmod(x, y, not(0))\n prod0 := mul(x, y)\n prod1 := sub(sub(mm, prod0), lt(mm, prod0))\n }\n\n // Handle non-overflow cases, 256 by 256 division.\n if (prod1 == 0) {\n return prod0 / denominator;\n }\n\n // Make sure the result is less than 2^256. Also prevents denominator == 0.\n require(denominator > prod1);\n\n ///////////////////////////////////////////////\n // 512 by 256 division.\n ///////////////////////////////////////////////\n\n // Make division exact by subtracting the remainder from [prod1 prod0].\n uint256 remainder;\n assembly {\n // Compute remainder using mulmod.\n remainder := mulmod(x, y, denominator)\n\n // Subtract 256 bit number from 512 bit number.\n prod1 := sub(prod1, gt(remainder, prod0))\n prod0 := sub(prod0, remainder)\n }\n\n // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.\n // See https://cs.stackexchange.com/q/138556/92363.\n\n // Does not overflow because the denominator cannot be zero at this stage in the function.\n uint256 twos = denominator & (~denominator + 1);\n assembly {\n // Divide denominator by twos.\n denominator := div(denominator, twos)\n\n // Divide [prod1 prod0] by twos.\n prod0 := div(prod0, twos)\n\n // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.\n twos := add(div(sub(0, twos), twos), 1)\n }\n\n // Shift in bits from prod1 into prod0.\n prod0 |= prod1 * twos;\n\n // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such\n // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for\n // four bits. That is, denominator * inv = 1 mod 2^4.\n uint256 inverse = (3 * denominator) ^ 2;\n\n // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works\n // in modular arithmetic, doubling the correct bits in each step.\n inverse *= 2 - denominator * inverse; // inverse mod 2^8\n inverse *= 2 - denominator * inverse; // inverse mod 2^16\n inverse *= 2 - denominator * inverse; // inverse mod 2^32\n inverse *= 2 - denominator * inverse; // inverse mod 2^64\n inverse *= 2 - denominator * inverse; // inverse mod 2^128\n inverse *= 2 - denominator * inverse; // inverse mod 2^256\n\n // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.\n // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is\n // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1\n // is no longer required.\n result = prod0 * inverse;\n return result;\n }\n }\n\n /**\n * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.\n */\n function mulDiv(\n uint256 x,\n uint256 y,\n uint256 denominator,\n Rounding rounding\n ) internal pure returns (uint256) {\n uint256 result = mulDiv(x, y, denominator);\n if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {\n result += 1;\n }\n return result;\n }\n\n /**\n * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.\n *\n * Inspired by Henry S. Warren, Jr.'s \"Hacker's Delight\" (Chapter 11).\n */\n function sqrt(uint256 a) internal pure returns (uint256) {\n if (a == 0) {\n return 0;\n }\n\n // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.\n //\n // We know that the \"msb\" (most significant bit) of our target number `a` is a power of 2 such that we have\n // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.\n //\n // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`\n // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`\n // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`\n //\n // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.\n uint256 result = 1 << (log2(a) >> 1);\n\n // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,\n // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at\n // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision\n // into the expected uint128 result.\n unchecked {\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n result = (result + a / result) >> 1;\n return min(result, a / result);\n }\n }\n\n /**\n * @notice Calculates sqrt(a), following the selected rounding direction.\n */\n function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = sqrt(a);\n return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);\n }\n }\n\n /**\n * @dev Return the log in base 2, rounded down, of a positive value.\n * Returns 0 if given 0.\n */\n function log2(uint256 value) internal pure returns (uint256) {\n uint256 result = 0;\n unchecked {\n if (value >> 128 > 0) {\n value >>= 128;\n result += 128;\n }\n if (value >> 64 > 0) {\n value >>= 64;\n result += 64;\n }\n if (value >> 32 > 0) {\n value >>= 32;\n result += 32;\n }\n if (value >> 16 > 0) {\n value >>= 16;\n result += 16;\n }\n if (value >> 8 > 0) {\n value >>= 8;\n result += 8;\n }\n if (value >> 4 > 0) {\n value >>= 4;\n result += 4;\n }\n if (value >> 2 > 0) {\n value >>= 2;\n result += 2;\n }\n if (value >> 1 > 0) {\n result += 1;\n }\n }\n return result;\n }\n\n /**\n * @dev Return the log in base 2, following the selected rounding direction, of a positive value.\n * Returns 0 if given 0.\n */\n function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = log2(value);\n return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);\n }\n }\n\n /**\n * @dev Return the log in base 10, rounded down, of a positive value.\n * Returns 0 if given 0.\n */\n function log10(uint256 value) internal pure returns (uint256) {\n uint256 result = 0;\n unchecked {\n if (value >= 10**64) {\n value /= 10**64;\n result += 64;\n }\n if (value >= 10**32) {\n value /= 10**32;\n result += 32;\n }\n if (value >= 10**16) {\n value /= 10**16;\n result += 16;\n }\n if (value >= 10**8) {\n value /= 10**8;\n result += 8;\n }\n if (value >= 10**4) {\n value /= 10**4;\n result += 4;\n }\n if (value >= 10**2) {\n value /= 10**2;\n result += 2;\n }\n if (value >= 10**1) {\n result += 1;\n }\n }\n return result;\n }\n\n /**\n * @dev Return the log in base 10, following the selected rounding direction, of a positive value.\n * Returns 0 if given 0.\n */\n function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = log10(value);\n return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);\n }\n }\n\n /**\n * @dev Return the log in base 256, rounded down, of a positive value.\n * Returns 0 if given 0.\n *\n * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.\n */\n function log256(uint256 value) internal pure returns (uint256) {\n uint256 result = 0;\n unchecked {\n if (value >> 128 > 0) {\n value >>= 128;\n result += 16;\n }\n if (value >> 64 > 0) {\n value >>= 64;\n result += 8;\n }\n if (value >> 32 > 0) {\n value >>= 32;\n result += 4;\n }\n if (value >> 16 > 0) {\n value >>= 16;\n result += 2;\n }\n if (value >> 8 > 0) {\n result += 1;\n }\n }\n return result;\n }\n\n /**\n * @dev Return the log in base 10, following the selected rounding direction, of a positive value.\n * Returns 0 if given 0.\n */\n function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {\n unchecked {\n uint256 result = log256(value);\n return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);\n }\n }\n}\n"
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"@openzeppelin/contracts/utils/Strings.sol": {
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"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./math/Math.sol\";\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n bytes16 private constant _SYMBOLS = \"0123456789abcdef\";\n uint8 private constant _ADDRESS_LENGTH = 20;\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` decimal representation.\n */\n function toString(uint256 value) internal pure returns (string memory) {\n unchecked {\n uint256 length = Math.log10(value) + 1;\n string memory buffer = new string(length);\n uint256 ptr;\n /// @solidity memory-safe-assembly\n assembly {\n ptr := add(buffer, add(32, length))\n }\n while (true) {\n ptr--;\n /// @solidity memory-safe-assembly\n assembly {\n mstore8(ptr, byte(mod(value, 10), _SYMBOLS))\n }\n value /= 10;\n if (value == 0) break;\n }\n return buffer;\n }\n }\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\n */\n function toHexString(uint256 value) internal pure returns (string memory) {\n unchecked {\n return toHexString(value, Math.log256(value) + 1);\n }\n }\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n */\n function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\n bytes memory buffer = new bytes(2 * length + 2);\n buffer[0] = \"0\";\n buffer[1] = \"x\";\n for (uint256 i = 2 * length + 1; i > 1; --i) {\n buffer[i] = _SYMBOLS[value & 0xf];\n value >>= 4;\n }\n require(value == 0, \"Strings: hex length insufficient\");\n return string(buffer);\n }\n\n /**\n * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.\n */\n function toHexString(address addr) internal pure returns (string memory) {\n return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);\n }\n}\n"
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},
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"contracts/FleekAccessControl.sol": {
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"content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.7;\n\nimport \"@openzeppelin/contracts/utils/Counters.sol\";\n\ncontract FleekAccessControl {\n using Counters for Counters.Counter;\n\n enum Roles {\n Owner,\n Controller\n }\n\n event TokenRoleGranted(uint256 indexed tokenId, Roles indexed role, address indexed toAddress, address byAddress);\n event TokenRoleRevoked(uint256 indexed tokenId, Roles indexed role, address indexed toAddress, address byAddress);\n event CollectionRoleGranted(Roles indexed role, address indexed toAddress, address byAddress);\n event CollectionRoleRevoked(Roles indexed role, address indexed toAddress, address byAddress);\n\n struct Role {\n mapping(address => uint256) indexes;\n address[] members;\n }\n\n Counters.Counter private _collectionRolesVersion;\n // _collectionRoles[version][role]\n mapping(uint256 => mapping(Roles => Role)) private _collectionRoles;\n\n mapping(uint256 => Counters.Counter) private _tokenRolesVersion;\n // _tokenRoles[tokenId][version][role]\n mapping(uint256 => mapping(uint256 => mapping(Roles => Role))) private _tokenRoles;\n\n /**\n * @dev Initializes the contract by granting the `Owner` role to the deployer.\n */\n constructor() {\n _grantCollectionRole(Roles.Owner, msg.sender);\n }\n\n /**\n * @dev Checks if the `msg.sender` has a certain role.\n */\n modifier requireCollectionRole(Roles role) {\n require(\n hasCollectionRole(role, msg.sender) || hasCollectionRole(Roles.Owner, msg.sender),\n \"FleekAccessControl: must have collection role\"\n );\n _;\n }\n\n /**\n * @dev Checks if the `msg.sender` has the `Token` role for a certain `tokenId`.\n */\n modifier requireTokenRole(uint256 tokenId, Roles role) {\n require(\n hasTokenRole(tokenId, role, msg.sender) || hasTokenRole(tokenId, Roles.Owner, msg.sender),\n \"FleekAccessControl: must have token role\"\n );\n _;\n }\n\n /**\n * @dev Grants the collection role to an address.\n *\n * Requirements:\n *\n * - the caller should have the collection role.\n *\n */\n function grantCollectionRole(Roles role, address account) public requireCollectionRole(Roles.Owner) {\n _grantCollectionRole(role, account);\n }\n\n /**\n * @dev Grants the token role to an address.\n *\n * Requirements:\n *\n * - the caller should have the token role.\n *\n */\n function grantTokenRole(\n uint256 tokenId,\n Roles role,\n address account\n ) public requireTokenRole(tokenId, Roles.Owner) {\n _grantTokenRole(tokenId, role, account);\n }\n\n /**\n * @dev Revokes the collection role of an address.\n *\n * Requirements:\n *\n * - the caller should have the collection role.\n *\n */\n function revokeCollectionRole(Roles role, address account) public requireCollectionRole(Roles.Owner) {\n _revokeCollectionRole(role, account);\n }\n\n /**\n * @dev Revokes the token role of an address.\n *\n * Requirements:\n *\n * - the caller should have the token role.\n *\n */\n function revokeTokenRole(\n uint256 tokenId,\n Roles role,\n address account\n ) public requireTokenRole(tokenId, Roles.Owner) {\n _revokeTokenRole(tokenId, role, account);\n }\n\n /**\n * @dev Returns `True` if a certain address has the collection role.\n */\n function hasCollectionRole(Roles role, address account) public view returns (bool) {\n uint256 currentVersion = _collectionRolesVersion.current();\n\n return _collectionRoles[currentVersion][role].indexes[account] != 0;\n }\n\n /**\n * @dev Returns `True` if a certain address has the token role.\n */\n function hasTokenRole(uint256 tokenId, Roles role, address account) public view returns (bool) {\n uint256 currentVersion = _tokenRolesVersion[tokenId].current();\n return _tokenRoles[tokenId][currentVersion][role].indexes[account] != 0;\n }\n\n /**\n * @dev Returns an array of addresses that all have the collection role.\n */\n function getCollectionRoleMembers(Roles role) public view returns (address[] memory) {\n uint256 currentVersion = _collectionRolesVersion.current();\n return _collectionRoles[currentVersion][role].members;\n }\n\n /**\n * @dev Returns an array of addresses that all have the same token role for a certain tokenId.\n */\n function getTokenRoleMembers(uint256 tokenId, Roles role) public view returns (address[] memory) {\n uint256 currentVersion = _tokenRolesVersion[tokenId].current();\n return _tokenRoles[tokenId][currentVersion][role].members;\n }\n\n /**\n * @dev Grants the collection role to an address.\n */\n function _grantCollectionRole(Roles role, address account) internal {\n uint256 currentVersion = _collectionRolesVersion.current();\n _grantRole(_collectionRoles[currentVersion][role], account);\n emit CollectionRoleGranted(role, account, msg.sender);\n }\n\n /**\n * @dev Revokes the collection role of an address.\n */\n function _revokeCollectionRole(Roles role, address account) internal {\n uint256 currentVersion = _collectionRolesVersion.current();\n _revokeRole(_collectionRoles[currentVersion][role], account);\n emit CollectionRoleRevoked(role, account, msg.sender);\n }\n\n /**\n * @dev Grants the token role to an address.\n */\n function _grantTokenRole(uint256 tokenId, Roles role, address account) internal {\n uint256 currentVersion = _tokenRolesVersion[tokenId].current();\n _grantRole(_tokenRoles[tokenId][currentVersion][role], account);\n emit TokenRoleGranted(tokenId, role, account, msg.sender);\n }\n\n /**\n * @dev Revokes the token role of an address.\n */\n function _revokeTokenRole(uint256 tokenId, Roles role, address account) internal {\n uint256 currentVersion = _tokenRolesVersion[tokenId].current();\n _revokeRole(_tokenRoles[tokenId][currentVersion][role], account);\n emit TokenRoleRevoked(tokenId, role, account, msg.sender);\n }\n\n /**\n * @dev Grants a certain role to a certain address.\n */\n function _grantRole(Role storage role, address account) internal {\n if (role.indexes[account] == 0) {\n role.members.push(account);\n role.indexes[account] = role.members.length;\n }\n }\n\n /**\n * @dev Revokes a certain role from a certain address.\n */\n function _revokeRole(Role storage role, address account) internal {\n if (role.indexes[account] != 0) {\n uint256 index = role.indexes[account] - 1;\n uint256 lastIndex = role.members.length - 1;\n address lastAccount = role.members[lastIndex];\n\n role.members[index] = lastAccount;\n role.indexes[lastAccount] = index + 1;\n\n role.members.pop();\n delete role.indexes[account];\n }\n }\n\n /**\n * @dev Clears all token roles for a certain tokenId.\n * Should only be used for burning tokens.\n */\n function _clearAllTokenRoles(uint256 tokenId) internal {\n _tokenRolesVersion[tokenId].increment();\n }\n\n /**\n * @dev Clears all token roles for a certain tokenId and grants the owner role to a new address.\n * Should only be used for transferring tokens.\n */\n function _clearAllTokenRoles(uint256 tokenId, address newOwner) internal {\n _clearAllTokenRoles(tokenId);\n _grantTokenRole(tokenId, Roles.Owner, newOwner);\n }\n}\n"
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},
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"contracts/FleekERC721.sol": {
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"content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.7;\n\nimport \"@openzeppelin/contracts/token/ERC721/ERC721.sol\";\nimport \"@openzeppelin/contracts/utils/Counters.sol\";\nimport \"@openzeppelin/contracts/utils/Base64.sol\";\nimport \"./FleekAccessControl.sol\";\n\ncontract FleekERC721 is ERC721, FleekAccessControl {\n using Strings for uint256;\n using Counters for Counters.Counter;\n\n event NewBuild(uint256 indexed token, string indexed commitHash, address indexed triggeredBy);\n event NewTokenName(uint256 indexed token, string indexed name, address indexed triggeredBy);\n event NewTokenDescription(uint256 indexed token, string indexed description, address indexed triggeredBy);\n event NewTokenImage(uint256 indexed token, string indexed image, address indexed triggeredBy);\n event NewTokenExternalURL(uint256 indexed token, string indexed externalURL, address indexed triggeredBy);\n event NewTokenENS(uint256 indexed token, string indexed ENS, address indexed triggeredBy);\n\n /**\n * The properties are stored as string to keep consistency with\n * other token contracts, we might consider changing for bytes32\n * in the future due to gas optimization.\n */\n struct App {\n string name; // Name of the site\n string description; // Description about the site\n string image; // Preview Image IPFS Link\n string externalURL; // Site URL\n string ENS; // ENS ID\n uint256 currentBuild; // The current build number (Increments by one with each change, starts at zero)\n mapping(uint256 => Build) builds; // Mapping to build details for each build number\n }\n\n /**\n * The metadata that is stored for each build.\n */\n struct Build {\n string commitHash;\n string gitRepository;\n }\n\n Counters.Counter private _tokenIds;\n mapping(uint256 => App) private _apps;\n\n /**\n * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.\n */\n constructor(string memory _name, string memory _symbol) ERC721(_name, _symbol) {}\n\n /**\n * @dev Checks if msg.sender has the role of tokenOwner for a certain tokenId.\n */\n modifier requireTokenOwner(uint256 tokenId) {\n require(msg.sender == ownerOf(tokenId), \"FleekERC721: must be token owner\");\n _;\n }\n\n /**\n * @dev Mints a token and returns a tokenId.\n *\n * If the `tokenId` has not been minted before, and the `to` address is not zero, emits a {Transfer} event.\n *\n * Requirements:\n *\n * - the caller must have ``collectionOwner``'s admin role.\n *\n */\n function mint(\n address to,\n string memory name,\n string memory description,\n string memory image,\n string memory externalURL,\n string memory ENS,\n string memory commitHash,\n string memory gitRepository\n ) public payable requireCollectionRole(Roles.Owner) returns (uint256) {\n uint256 tokenId = _tokenIds.current();\n _mint(to, tokenId);\n _tokenIds.increment();\n\n App storage app = _apps[tokenId];\n app.name = name;\n app.description = description;\n app.image = image;\n app.externalURL = externalURL;\n app.ENS = ENS;\n\n // The mint interaction is considered to be the first build of the site. Updates from now on all increment the currentBuild by one and update the mapping.\n app.currentBuild = 0;\n app.builds[0] = Build(commitHash, gitRepository);\n\n return tokenId;\n }\n\n /**\n * @dev Returns the token metadata associated with the `tokenId`.\n *\n * Returns a based64 encoded string value of the URI.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n *\n */\n function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {\n _requireMinted(tokenId);\n address owner = ownerOf(tokenId);\n App storage app = _apps[tokenId];\n\n // prettier-ignore\n bytes memory dataURI = abi.encodePacked(\n '{',\n '\"name\":\"', app.name, '\",',\n '\"description\":\"', app.description, '\",',\n '\"owner\":\"', Strings.toHexString(uint160(owner), 20), '\",',\n '\"external_url\":\"', app.externalURL, '\",',\n '\"image\":\"', app.image, '\",',\n '\"attributes\": [',\n '{\"trait_type\": \"ENS\", \"value\":\"', app.ENS,'\"},',\n '{\"trait_type\": \"Commit Hash\", \"value\":\"', app.builds[app.currentBuild].commitHash,'\"},',\n '{\"trait_type\": \"Repository\", \"value\":\"', app.builds[app.currentBuild].gitRepository,'\"},',\n '{\"trait_type\": \"Version\", \"value\":\"', Strings.toString(app.currentBuild),'\"}',\n ']',\n '}'\n );\n\n return string(abi.encodePacked(_baseURI(), Base64.encode((dataURI))));\n }\n\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721) returns (bool) {\n return super.supportsInterface(interfaceId);\n }\n\n /**\n * @dev Override of _beforeTokenTransfer of ERC721.\n * Here it needs to update the token controller roles for mint, burn and transfer.\n */\n function _beforeTokenTransfer(\n address from,\n address to,\n uint256 tokenId,\n uint256 batchSize\n ) internal virtual override {\n if (from != address(0) && to != address(0)) {\n // Transfer\n _clearAllTokenRoles(tokenId, to);\n } else if (from == address(0)) {\n // Mint\n _grantTokenRole(tokenId, Roles.Owner, to);\n } else if (to == address(0)) {\n // Burn\n _clearAllTokenRoles(tokenId);\n }\n super._beforeTokenTransfer(from, to, tokenId, batchSize);\n }\n\n /**\n * @dev A baseURI internal function implementation to be called in the `tokenURI` function.\n */\n function _baseURI() internal view virtual override returns (string memory) {\n return \"data:application/json;base64,\";\n }\n\n /**\n * @dev Updates the `externalURL` metadata field of a minted `tokenId`.\n *\n * May emit a {NewTokenExternalURL} event.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n * - the sender must have the `tokenController` role.\n *\n */\n function setTokenExternalURL(\n uint256 tokenId,\n string memory _tokenExternalURL\n ) public virtual requireTokenRole(tokenId, Roles.Controller) {\n _requireMinted(tokenId);\n _apps[tokenId].externalURL = _tokenExternalURL;\n emit NewTokenExternalURL(tokenId, _tokenExternalURL, msg.sender);\n }\n\n /**\n * @dev Updates the `ENS` metadata field of a minted `tokenId`.\n *\n * May emit a {NewTokenENS} event.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n * - the sender must have the `tokenController` role.\n *\n */\n function setTokenENS(\n uint256 tokenId,\n string memory _tokenENS\n ) public virtual requireTokenRole(tokenId, Roles.Controller) {\n _requireMinted(tokenId);\n _apps[tokenId].ENS = _tokenENS;\n emit NewTokenENS(tokenId, _tokenENS, msg.sender);\n }\n\n /**\n * @dev Updates the `name` metadata field of a minted `tokenId`.\n *\n * May emit a {NewTokenName} event.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n * - the sender must have the `tokenController` role.\n *\n */\n function setTokenName(\n uint256 tokenId,\n string memory _tokenName\n ) public virtual requireTokenRole(tokenId, Roles.Controller) {\n _requireMinted(tokenId);\n _apps[tokenId].name = _tokenName;\n emit NewTokenName(tokenId, _tokenName, msg.sender);\n }\n\n /**\n * @dev Updates the `description` metadata field of a minted `tokenId`.\n *\n * May emit a {NewTokenDescription} event.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n * - the sender must have the `tokenController` role.\n *\n */\n function setTokenDescription(\n uint256 tokenId,\n string memory _tokenDescription\n ) public virtual requireTokenRole(tokenId, Roles.Controller) {\n _requireMinted(tokenId);\n _apps[tokenId].description = _tokenDescription;\n emit NewTokenDescription(tokenId, _tokenDescription, msg.sender);\n }\n\n /**\n * @dev Updates the `image` metadata field of a minted `tokenId`.\n *\n * May emit a {NewTokenImage} event.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n * - the sender must have the `tokenController` role.\n *\n */\n function setTokenImage(\n uint256 tokenId,\n string memory _tokenImage\n ) public virtual requireTokenRole(tokenId, Roles.Controller) {\n _requireMinted(tokenId);\n _apps[tokenId].image = _tokenImage;\n emit NewTokenImage(tokenId, _tokenImage, msg.sender);\n }\n\n /**\n * @dev Adds a new build to a minted `tokenId`'s builds mapping.\n *\n * May emit a {NewBuild} event.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n * - the sender must have the `tokenController` role.\n *\n */\n function setTokenBuild(\n uint256 tokenId,\n string memory _commitHash,\n string memory _gitRepository\n ) public virtual requireTokenRole(tokenId, Roles.Controller) {\n _requireMinted(tokenId);\n _apps[tokenId].builds[++_apps[tokenId].currentBuild] = Build(_commitHash, _gitRepository);\n emit NewBuild(tokenId, _commitHash, msg.sender);\n }\n\n /**\n * @dev Burns a previously minted `tokenId`.\n *\n * May emit a {Transfer} event.\n *\n * Requirements:\n *\n * - the tokenId must be minted and valid.\n * - the sender must have the `tokenOwner` role.\n *\n */\n function burn(uint256 tokenId) public virtual requireTokenRole(tokenId, Roles.Owner) {\n super._burn(tokenId);\n\n if (bytes(_apps[tokenId].externalURL).length != 0) {\n delete _apps[tokenId];\n }\n }\n}\n"
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}
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},
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"settings": {
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"optimizer": {
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|
"enabled": false,
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"runs": 200
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},
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"outputSelection": {
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"*": {
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"*": [
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"abi",
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"evm.bytecode",
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"evm.deployedBytecode",
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"evm.methodIdentifiers",
|
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"metadata",
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"devdoc",
|
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"userdoc",
|
|
"storageLayout",
|
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"evm.gasEstimates"
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],
|
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"": ["ast"]
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}
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},
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"metadata": {
|
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"useLiteralContent": true
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}
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}
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}
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