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@ -0,0 +1,468 @@ |
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--- token/ERC721/ERC721.sol.orig 1969-12-31 18:00:00
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+++ token/ERC721/ERC721.sol.orig 2023-08-13 09:56:16
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@@ -0,0 +1,465 @@
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+// SPDX-License-Identifier: MIT
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+// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)
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+
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+pragma solidity ^0.8.20;
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+
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+import {IERC721} from "./IERC721.sol";
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+import {IERC721Receiver} from "./IERC721Receiver.sol";
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+import {IERC721Metadata} from "./extensions/IERC721Metadata.sol";
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+import {Context} from "../../utils/Context.sol";
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+import {Strings} from "../../utils/Strings.sol";
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+import {IERC165, ERC165} from "../../utils/introspection/ERC165.sol";
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+import {IERC721Errors} from "../../interfaces/draft-IERC6093.sol";
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+
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+/**
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+ * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
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+ * the Metadata extension, but not including the Enumerable extension, which is available separately as
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+ * {ERC721Enumerable}.
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+ */
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+abstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {
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+ using Strings for uint256;
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+
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+ // Token name
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+ string private _name;
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+
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+ // Token symbol
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+ string private _symbol;
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+
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+ mapping(uint256 tokenId => address) private _owners;
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+
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+ mapping(address owner => uint256) private _balances;
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+
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+ mapping(uint256 tokenId => address) private _tokenApprovals;
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+
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+ mapping(address owner => mapping(address operator => bool)) private _operatorApprovals;
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+
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+ /**
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+ * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
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+ */
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+ constructor(string memory name_, string memory symbol_) {
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+ _name = name_;
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+ _symbol = symbol_;
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+ }
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+
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+ /**
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+ * @dev See {IERC165-supportsInterface}.
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+ */
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+ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
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+ return
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+ interfaceId == type(IERC721).interfaceId ||
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+ interfaceId == type(IERC721Metadata).interfaceId ||
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+ super.supportsInterface(interfaceId);
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+ }
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+
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+ /**
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+ * @dev See {IERC721-balanceOf}.
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+ */
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+ function balanceOf(address owner) public view virtual returns (uint256) {
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+ if (owner == address(0)) {
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+ revert ERC721InvalidOwner(address(0));
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+ }
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+ return _balances[owner];
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+ }
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+
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+ /**
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+ * @dev See {IERC721-ownerOf}.
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+ */
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+ function ownerOf(uint256 tokenId) public view virtual returns (address) {
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+ address owner = _ownerOf(tokenId);
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+ if (owner == address(0)) {
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+ revert ERC721NonexistentToken(tokenId);
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+ }
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+ return owner;
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+ }
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+
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+ /**
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+ * @dev See {IERC721Metadata-name}.
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+ */
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+ function name() public view virtual returns (string memory) {
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+ return _name;
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+ }
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+
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+ /**
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+ * @dev See {IERC721Metadata-symbol}.
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+ */
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+ function symbol() public view virtual returns (string memory) {
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+ return _symbol;
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+ }
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+
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+ /**
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+ * @dev See {IERC721Metadata-tokenURI}.
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+ */
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+ function tokenURI(uint256 tokenId) public view virtual returns (string memory) {
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+ _requireMinted(tokenId);
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+
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+ string memory baseURI = _baseURI();
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+ return bytes(baseURI).length > 0 ? string.concat(baseURI, tokenId.toString()) : "";
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+ }
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+
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+ /**
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+ * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
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+ * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
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+ * by default, can be overridden in child contracts.
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+ */
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+ function _baseURI() internal view virtual returns (string memory) {
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+ return "";
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+ }
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+
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+ /**
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+ * @dev See {IERC721-approve}.
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+ */
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+ function approve(address to, uint256 tokenId) public virtual {
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+ _approve(to, tokenId, _msgSender());
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+ }
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+
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+ /**
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+ * @dev See {IERC721-getApproved}.
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+ */
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+ function getApproved(uint256 tokenId) public view virtual returns (address) {
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+ _requireMinted(tokenId);
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+
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+ return _getApproved(tokenId);
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+ }
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+
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+ /**
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+ * @dev See {IERC721-setApprovalForAll}.
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+ */
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+ function setApprovalForAll(address operator, bool approved) public virtual {
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+ _setApprovalForAll(_msgSender(), operator, approved);
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+ }
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+
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+ /**
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+ * @dev See {IERC721-isApprovedForAll}.
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+ */
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+ function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {
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+ return _operatorApprovals[owner][operator];
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+ }
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+
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+ /**
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+ * @dev See {IERC721-transferFrom}.
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+ */
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+ function transferFrom(address from, address to, uint256 tokenId) public virtual {
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+ if (to == address(0)) {
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+ revert ERC721InvalidReceiver(address(0));
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+ }
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+ // Setting an "auth" arguments enables the `_isAuthorized` check which verifies that the token exists
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+ // (from != 0). Therefore, it is not needed to verify that the return value is not 0 here.
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+ address previousOwner = _update(to, tokenId, _msgSender());
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+ if (previousOwner != from) {
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+ revert ERC721IncorrectOwner(from, tokenId, previousOwner);
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+ }
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+ }
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+
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+ /**
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+ * @dev See {IERC721-safeTransferFrom}.
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+ */
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+ function safeTransferFrom(address from, address to, uint256 tokenId) public {
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+ safeTransferFrom(from, to, tokenId, "");
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+ }
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+
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+ /**
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+ * @dev See {IERC721-safeTransferFrom}.
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+ */
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+ function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual {
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+ transferFrom(from, to, tokenId);
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+ _checkOnERC721Received(from, to, tokenId, data);
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+ }
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+
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+ /**
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+ * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
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+ *
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+ * IMPORTANT: Any overrides to this function that add ownership of tokens not tracked by the
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+ * core ERC721 logic MUST be matched with the use of {_increaseBalance} to keep balances
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+ * consistent with ownership. The invariant to preserve is that for any address `a` the value returned by
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+ * `balanceOf(a)` must be equal to the number of tokens such that `_ownerOf(tokenId)` is `a`.
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+ */
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+ function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
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+ return _owners[tokenId];
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+ }
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+
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+ /**
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+ * @dev Returns the approved address for `tokenId`. Returns 0 if `tokenId` is not minted.
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+ */
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+ function _getApproved(uint256 tokenId) internal view virtual returns (address) {
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+ return _tokenApprovals[tokenId];
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+ }
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+
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+ /**
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+ * @dev Returns whether `spender` is allowed to manage `owner`'s tokens, or `tokenId` in
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+ * particular (ignoring whether it is owned by `owner`).
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+ *
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+ * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not
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+ * verify this assumption.
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+ */
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+ function _isAuthorized(address owner, address spender, uint256 tokenId) internal view virtual returns (bool) {
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+ return
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+ spender != address(0) &&
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+ (owner == spender || isApprovedForAll(owner, spender) || _getApproved(tokenId) == spender);
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+ }
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+
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+ /**
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+ * @dev Checks if `spender` can operate on `tokenId`, assuming the provided `owner` is the actual owner.
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+ * Reverts if `spender` has not approval for all assets of the provided `owner` nor the actual owner approved the `spender` for the specific `tokenId`.
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+ *
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+ * WARNING: This function relies on {_isAuthorized}, so it doesn't check whether `owner` is the
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+ * actual owner of `tokenId`.
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+ */
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+ function _checkAuthorized(address owner, address spender, uint256 tokenId) internal view virtual {
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+ if (!_isAuthorized(owner, spender, tokenId)) {
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+ if (owner == address(0)) {
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+ revert ERC721NonexistentToken(tokenId);
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+ } else {
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+ revert ERC721InsufficientApproval(spender, tokenId);
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+ }
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+ }
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+ }
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+
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+ /**
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+ * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
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+ *
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+ * NOTE: the value is limited to type(uint128).max. This protect against _balance overflow. It is unrealistic that
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+ * a uint256 would ever overflow from increments when these increments are bounded to uint128 values.
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+ *
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+ * WARNING: Increasing an account's balance using this function tends to be paired with an override of the
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+ * {_ownerOf} function to resolve the ownership of the corresponding tokens so that balances and ownership
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+ * remain consistent with one another.
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+ */
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+ function _increaseBalance(address account, uint128 value) internal virtual {
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+ unchecked {
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+ _balances[account] += value;
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+ }
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+ }
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+
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+ /**
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+ * @dev Transfers `tokenId` from its current owner to `to`, or alternatively mints (or burns) if the current owner
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+ * (or `to`) is the zero address. Returns the owner of the `tokenId` before the update.
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+ *
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+ * The `auth` argument is optional. If the value passed is non 0, then this function will check that
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+ * `auth` is either the owner of the token, or approved to operate on the token (by the owner).
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+ *
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+ * Emits a {Transfer} event.
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+ *
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+ * NOTE: If overriding this function in a way that tracks balances, see also {_increaseBalance}.
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+ */
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+ function _update(address to, uint256 tokenId, address auth) internal virtual returns (address) {
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+ address from = _ownerOf(tokenId);
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+
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+ // Perform (optional) operator check
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+ if (auth != address(0)) {
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+ _checkAuthorized(from, auth, tokenId);
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+ }
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+
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+ // Execute the update
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+ if (from != address(0)) {
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+ delete _tokenApprovals[tokenId];
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+ unchecked {
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+ _balances[from] -= 1;
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+ }
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+ }
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+
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+ if (to != address(0)) {
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+ unchecked {
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+ _balances[to] += 1;
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+ }
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+ }
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+
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+ _owners[tokenId] = to;
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+
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+ emit Transfer(from, to, tokenId);
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+
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+ return from;
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+ }
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+
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+ /**
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+ * @dev Mints `tokenId` and transfers it to `to`.
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+ *
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+ * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
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+ *
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+ * Requirements:
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+ *
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+ * - `tokenId` must not exist.
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+ * - `to` cannot be the zero address.
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+ *
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+ * Emits a {Transfer} event.
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+ */
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+ function _mint(address to, uint256 tokenId) internal {
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+ if (to == address(0)) {
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+ revert ERC721InvalidReceiver(address(0));
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+ }
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+ address previousOwner = _update(to, tokenId, address(0));
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+ if (previousOwner != address(0)) {
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+ revert ERC721InvalidSender(address(0));
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+ }
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+ }
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+
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+ /**
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+ * @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance.
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+ *
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+ * Requirements:
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+ *
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+ * - `tokenId` must not exist.
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+ * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
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+ *
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+ * Emits a {Transfer} event.
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+ */
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+ function _safeMint(address to, uint256 tokenId) internal {
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+ _safeMint(to, tokenId, "");
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+ }
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+
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+ /**
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+ * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
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+ * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
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+ */
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+ function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
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+ _mint(to, tokenId);
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+ _checkOnERC721Received(address(0), to, tokenId, data);
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+ }
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+
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+ /**
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+ * @dev Destroys `tokenId`.
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+ * The approval is cleared when the token is burned.
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+ * This is an internal function that does not check if the sender is authorized to operate on the token.
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+ *
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+ * Requirements:
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+ *
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+ * - `tokenId` must exist.
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+ *
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+ * Emits a {Transfer} event.
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+ */
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+ function _burn(uint256 tokenId) internal {
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+ address previousOwner = _update(address(0), tokenId, address(0));
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+ if (previousOwner == address(0)) {
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+ revert ERC721NonexistentToken(tokenId);
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+ }
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+ }
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+
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+ /**
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+ * @dev Transfers `tokenId` from `from` to `to`.
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+ * As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
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+ *
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+ * Requirements:
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+ *
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+ * - `to` cannot be the zero address.
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+ * - `tokenId` token must be owned by `from`.
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+ *
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+ * Emits a {Transfer} event.
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+ */
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+ function _transfer(address from, address to, uint256 tokenId) internal {
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+ if (to == address(0)) {
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+ revert ERC721InvalidReceiver(address(0));
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+ }
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+ address previousOwner = _update(to, tokenId, address(0));
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+ if (previousOwner == address(0)) {
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+ revert ERC721NonexistentToken(tokenId);
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+ } else if (previousOwner != from) {
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+ revert ERC721IncorrectOwner(from, tokenId, previousOwner);
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+ }
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+ }
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+
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+ /**
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+ * @dev Safely transfers `tokenId` token from `from` to `to`, checking that contract recipients
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+ * are aware of the ERC721 standard to prevent tokens from being forever locked.
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+ *
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+ * `data` is additional data, it has no specified format and it is sent in call to `to`.
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+ *
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+ * This internal function is like {safeTransferFrom} in the sense that it invokes
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+ * {IERC721Receiver-onERC721Received} on the receiver, and can be used to e.g.
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+ * implement alternative mechanisms to perform token transfer, such as signature-based.
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+ *
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+ * Requirements:
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+ *
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+ * - `tokenId` token must exist and be owned by `from`.
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+ * - `to` cannot be the zero address.
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+ * - `from` cannot be the zero address.
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+ * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
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+ *
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+ * Emits a {Transfer} event.
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+ */
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+ function _safeTransfer(address from, address to, uint256 tokenId) internal {
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+ _safeTransfer(from, to, tokenId, "");
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|
+ }
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+
|
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+ /**
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|
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+ * @dev Same as {xref-ERC721-_safeTransfer-address-address-uint256-}[`_safeTransfer`], with an additional `data` parameter which is
|
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|
|
+ * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
|
|
|
|
|
+ */
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|
+ function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
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|
+ _transfer(from, to, tokenId);
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|
+ _checkOnERC721Received(from, to, tokenId, data);
|
|
|
|
|
+ }
|
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+
|
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+ /**
|
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|
+ * @dev Approve `to` to operate on `tokenId`
|
|
|
|
|
+ *
|
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|
|
+ * The `auth` argument is optional. If the value passed is non 0, then this function will check that `auth` is
|
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|
+ * either the owner of the token, or approved to operate on all tokens held by this owner.
|
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+ *
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|
+ * Emits an {Approval} event.
|
|
|
|
|
+ */
|
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|
|
+ function _approve(address to, uint256 tokenId, address auth) internal virtual returns (address) {
|
|
|
|
|
+ address owner = ownerOf(tokenId);
|
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|
|
+
|
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|
|
+ // We do not use _isAuthorized because single-token approvals should not be able to call approve
|
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|
|
+ if (auth != address(0) && owner != auth && !isApprovedForAll(owner, auth)) {
|
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|
|
|
+ revert ERC721InvalidApprover(auth);
|
|
|
|
|
+ }
|
|
|
|
|
+
|
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|
|
|
+ _tokenApprovals[tokenId] = to;
|
|
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|
|
+ emit Approval(owner, to, tokenId);
|
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|
|
|
+
|
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|
|
|
+ return owner;
|
|
|
|
|
+ }
|
|
|
|
|
+
|
|
|
|
|
+ /**
|
|
|
|
|
+ * @dev Approve `operator` to operate on all of `owner` tokens
|
|
|
|
|
+ *
|
|
|
|
|
+ * Requirements:
|
|
|
|
|
+ * - operator can't be the address zero.
|
|
|
|
|
+ *
|
|
|
|
|
+ * Emits an {ApprovalForAll} event.
|
|
|
|
|
+ */
|
|
|
|
|
+ function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
|
|
|
|
|
+ if (operator == address(0)) {
|
|
|
|
|
+ revert ERC721InvalidOperator(operator);
|
|
|
|
|
+ }
|
|
|
|
|
+ _operatorApprovals[owner][operator] = approved;
|
|
|
|
|
+ emit ApprovalForAll(owner, operator, approved);
|
|
|
|
|
+ }
|
|
|
|
|
+
|
|
|
|
|
+ /**
|
|
|
|
|
+ * @dev Reverts if the `tokenId` has not been minted yet.
|
|
|
|
|
+ */
|
|
|
|
|
+ function _requireMinted(uint256 tokenId) internal view virtual {
|
|
|
|
|
+ if (_ownerOf(tokenId) == address(0)) {
|
|
|
|
|
+ revert ERC721NonexistentToken(tokenId);
|
|
|
|
|
+ }
|
|
|
|
|
+ }
|
|
|
|
|
+
|
|
|
|
|
+ /**
|
|
|
|
|
+ * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target address. This will revert if the
|
|
|
|
|
+ * recipient doesn't accept the token transfer. The call is not executed if the target address is not a contract.
|
|
|
|
|
+ *
|
|
|
|
|
+ * @param from address representing the previous owner of the given token ID
|
|
|
|
|
+ * @param to target address that will receive the tokens
|
|
|
|
|
+ * @param tokenId uint256 ID of the token to be transferred
|
|
|
|
|
+ * @param data bytes optional data to send along with the call
|
|
|
|
|
+ */
|
|
|
|
|
+ function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory data) private {
|
|
|
|
|
+ if (to.code.length > 0) {
|
|
|
|
|
+ try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
|
|
|
|
|
+ if (retval != IERC721Receiver.onERC721Received.selector) {
|
|
|
|
|
+ revert ERC721InvalidReceiver(to);
|
|
|
|
|
+ }
|
|
|
|
|
+ } catch (bytes memory reason) {
|
|
|
|
|
+ if (reason.length == 0) {
|
|
|
|
|
+ revert ERC721InvalidReceiver(to);
|
|
|
|
|
+ } else {
|
|
|
|
|
+ /// @solidity memory-safe-assembly
|
|
|
|
|
+ assembly {
|
|
|
|
|
+ revert(add(32, reason), mload(reason))
|
|
|
|
|
+ }
|
|
|
|
|
+ }
|
|
|
|
|
+ }
|
|
|
|
|
+ }
|
|
|
|
|
+ }
|
|
|
|
|
+}
|
ernestognw
2 years ago