royalty reporting and default royalty, untested, may add specific royalties later

contracts/CurioERC1155Wrapper.sol

@@ -10,13 +10,16 @@ import "@openzeppelin/contracts/utils/Strings.sol";
 import "@openzeppelin/contracts/utils/Base64.sol"; 
 import "@openzeppelin/contracts/access/Ownable.sol";
 import "@openzeppelin/contracts/security/Pausable.sol";
+import "@openzeppelin/contracts/token/common/ERC2981.sol";
 
-contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, Ownable, Pausable {
+contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, ERC2981, Ownable, Pausable {
     using Address for address;
 
     mapping (uint256 => address) public contracts;
     mapping (uint256 => string) public urls;
 
+    uint96 internal defaultRoyalty = 100;
+
     /**
         @notice Initialize an nft id's data
     */
@@ -41,6 +44,13 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, O
         create(7, 0x5e7318f75b177a0F27A31CB20bB26bd0C049620c, "https://twitter.com/sonyasupposedly");
         create(8, 0x5539907D45a608828756765429f2B4e6311c295c, "https://shpposter.club/users/shpuld");
         create(9, 0x0a0e64067B1F7aDfbF876Dde4322633Ff7Df9702, "https://bbs.kawa-kun.com/users/tk");
+
+        _setDefaultRoyalty(msg.sender, defaultRoyalty);
+    }
+
+    function transferOwnership(address newOwner) public override onlyOwner {
+        _setDefaultRoyalty(newOwner, defaultRoyalty);
+        super.transferOwnership(newOwner);
     }
 
     /**
@@ -81,9 +91,11 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, O
         @param _interfaceId  The interface identifier, as specified in ERC-165
         @return `true` if the contract implements `_interfaceId`
     */
-    function supportsInterface(bytes4 _interfaceId) public pure override(ERC1155, ERC1155Metadata) returns (bool) {
+    function supportsInterface(bytes4 _interfaceId) public view override(ERC1155, ERC1155Metadata, ERC2981) returns (bool) {
         return ERC1155.supportsInterface(_interfaceId)
-            || ERC1155Metadata.supportsInterface(_interfaceId);
+            || ERC1155Metadata.supportsInterface(_interfaceId)
+            || ERC2981.supportsInterface(_interfaceId)
+        ;
     }
 
     /**

contracts/ERC1155.sol

@@ -36,7 +36,7 @@ contract ERC1155 is IERC1155, IERC165, CommonConstants
 
     function supportsInterface(bytes4 _interfaceId)
     public
-    pure
+    view
     virtual
     returns (bool) {
          if (_interfaceId == INTERFACE_SIGNATURE_ERC165 ||

contracts/ERC1155Metadata.sol

@@ -10,7 +10,7 @@ contract ERC1155Metadata {
     @param _interfaceId  The interface identifier, as specified in ERC-165
     @return `true` if the contract implements `_interfaceID`
   */
-  function supportsInterface(bytes4 _interfaceId) public virtual pure returns (bool) {
+  function supportsInterface(bytes4 _interfaceId) public virtual view returns (bool) {
     if (_interfaceId == type(ERC1155Metadata_URI).interfaceId) {
       return true;
     }

contracts/IERC2981.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity ^0.8.17;
+
+import "@openzeppelin/contracts/interfaces/IERC165.sol";
+
+interface IERC2981 is IERC165 {
+    /// ERC165 bytes to add to interface array - set in parent contract
+    /// implementing this standard
+    ///
+    /// bytes4(keccak256("royaltyInfo(uint256,uint256)")) == 0x2a55205a
+    /// bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
+    /// _registerInterface(_INTERFACE_ID_ERC2981);
+
+    /// @notice Called with the sale price to determine how much royalty
+    //          is owed and to whom.
+    /// @param _tokenId - the NFT asset queried for royalty information
+    /// @param _salePrice - the sale price of the NFT asset specified by _tokenId
+    /// @return receiver - address of who should be sent the royalty payment
+    /// @return royaltyAmount - the royalty payment amount for _salePrice
+    function royaltyInfo(
+        uint256 _tokenId,
+        uint256 _salePrice
+    ) external view returns (
+        address receiver,
+        uint256 royaltyAmount
+    );
+}