Add IERC7160 extension

contracts/interfaces/IERC7160.sol

@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.20;
+
+/**
+ * @title EIP-7160 optional EIP-721 multi-metadata extension
+ * @author 0xG
+ * @author mpeyfuss
+ * @dev See https://eips.ethereum.org/EIPS/eip-7160 and https://eips.ethereum.org/EIPS/eip-721
+ */
+interface IERC7160 {
+
+  /**
+   * @dev This event emits when a token uri is pinned and
+   * is useful for indexing purposes.
+   */
+  event TokenUriPinned(uint256 indexed tokenId, uint256 indexed index);
+
+  /**
+   * @dev This event emits when a token uri is unpinned and
+   * is useful for indexing purposes.
+   */
+  event TokenUriUnpinned(uint256 indexed tokenId);
+
+  /**
+   * @notice Get all token uris associated with a particular token
+   * @dev If a token uri is pinned, the index returned SHOULD be the index in the string array
+   * @dev This call MUST revert if the token does not exist
+   *
+   * @param tokenId The identifier for the nft
+   * @return index An unisgned integer that specifies which uri is pinned for a token (or the default uri if unpinned)
+   * @return uris A string array of all uris associated with a token
+   * @return pinned A boolean showing if the token has pinned metadata or not
+   */
+  function tokenURIs(uint256 tokenId) external view returns (uint256 index, string[] memory uris, bool pinned);
+
+  /**
+   * @notice Pin a specific token uri for a particular token
+   * @dev This call MUST revert if the token does not exist
+   * @dev This call MUST emit a `TokenUriPinned` event
+   * @dev This call MAY emit a `MetadataUpdate` event from ERC-4096
+   *
+   * @param tokenId The identifier of the nft
+   * @param index The index in the string array returned from the `tokenURIs` function that should be pinned for the token
+   */
+  function pinTokenURI(uint256 tokenId, uint256 index) external;
+
+  /**
+   * @notice Unpin metadata for a particular token
+   * @dev This call MUST revert if the token does not exist
+   * @dev This call MUST emit a `TokenUriUnpinned` event
+   * @dev This call MAY emit a `MetadataUpdate` event from ERC-4096
+   * @dev It is up to the developer to define what this function does and is intentionally left open-ended
+   *
+   * @param tokenId The identifier of the nft
+   */
+  function unpinTokenURI(uint256 tokenId) external;
+
+  /**
+   * @notice Check on-chain if a token id has a pinned uri or not
+   * @dev This call MUST revert if the token does not exist
+   * @dev Useful for on-chain mechanics that don't require the tokenURIs themselves
+   *
+   * @param tokenId The identifier of the nft
+   * @return pinned A bool specifying if a token has metadata pinned or not
+   */
+  function hasPinnedTokenURI(uint256 tokenId) external view returns (bool pinned);
+}

contracts/interfaces/README.adoc

@@ -40,6 +40,7 @@ are useful to interact with third party contracts that implement them.
 - {IERC5313}
 - {IERC5805}
 - {IERC6372}
+- {IERC7160}
 
 == Detailed ABI
 
@@ -80,3 +81,5 @@ are useful to interact with third party contracts that implement them.
 {{IERC5805}}
 
 {{IERC6372}}
+
+{{IERC7160}}