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61 lines
2.0 KiB
61 lines
2.0 KiB
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC1155/extensions/ERC1155URIStorage.sol)
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pragma solidity ^0.8.20;
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import {Strings} from "../../../utils/Strings.sol";
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import {ERC1155} from "../ERC1155.sol";
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/**
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* @dev ERC-1155 token with storage based token URI management.
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* Inspired by the {ERC721URIStorage} extension
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*/
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abstract contract ERC1155URIStorage is ERC1155 {
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using Strings for uint256;
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// Optional base URI
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string private _baseURI = "";
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// Optional mapping for token URIs
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mapping(uint256 tokenId => string) private _tokenURIs;
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/**
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* @dev See {IERC1155MetadataURI-uri}.
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*
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* This implementation returns the concatenation of the `_baseURI`
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* and the token-specific uri if the latter is set
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*
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* This enables the following behaviors:
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*
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* - if `_tokenURIs[tokenId]` is set, then the result is the concatenation
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* of `_baseURI` and `_tokenURIs[tokenId]` (keep in mind that `_baseURI`
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* is empty per default);
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*
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* - if `_tokenURIs[tokenId]` is NOT set then we fallback to `super.uri()`
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* which in most cases will contain `ERC1155._uri`;
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*
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* - if `_tokenURIs[tokenId]` is NOT set, and if the parents do not have a
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* uri value set, then the result is empty.
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*/
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function uri(uint256 tokenId) public view virtual override returns (string memory) {
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string memory tokenURI = _tokenURIs[tokenId];
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// If token URI is set, concatenate base URI and tokenURI (via string.concat).
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return bytes(tokenURI).length > 0 ? string.concat(_baseURI, tokenURI) : super.uri(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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function _setURI(uint256 tokenId, string memory tokenURI) internal virtual {
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_tokenURIs[tokenId] = tokenURI;
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emit URI(uri(tokenId), tokenId);
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}
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/**
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* @dev Sets `baseURI` as the `_baseURI` for all tokens
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*/
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function _setBaseURI(string memory baseURI) internal virtual {
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_baseURI = baseURI;
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}
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}
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