81 lines
2.4 KiB
Solidity
81 lines
2.4 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721URIStorage.sol)
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pragma solidity ^0.8.0;
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import "../ERC721Upgradeable.sol";
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import "../../../proxy/utils/Initializable.sol";
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/**
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* @dev ERC721 token with storage based token URI management.
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*/
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abstract contract ERC721URIStorageUpgradeable is Initializable, ERC721Upgradeable {
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function __ERC721URIStorage_init() internal onlyInitializing {
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}
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function __ERC721URIStorage_init_unchained() internal onlyInitializing {
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}
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using StringsUpgradeable for uint256;
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// Optional mapping for token URIs
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mapping(uint256 => string) private _tokenURIs;
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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 override returns (string memory) {
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require(_exists(tokenId), "ERC721URIStorage: URI query for nonexistent token");
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string memory _tokenURI = _tokenURIs[tokenId];
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string memory base = _baseURI();
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// If there is no base URI, return the token URI.
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if (bytes(base).length == 0) {
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return _tokenURI;
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}
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// If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
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if (bytes(_tokenURI).length > 0) {
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return string(abi.encodePacked(base, _tokenURI));
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}
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return super.tokenURI(tokenId);
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}
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/**
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* @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
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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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function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
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require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
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_tokenURIs[tokenId] = _tokenURI;
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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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*
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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 virtual override {
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super._burn(tokenId);
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if (bytes(_tokenURIs[tokenId]).length != 0) {
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delete _tokenURIs[tokenId];
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}
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}
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/**
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* This empty reserved space is put in place to allow future versions to add new
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* variables without shifting down storage in the inheritance chain.
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* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
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*/
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uint256[49] private __gap;
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}
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