Royalty manager

contracts/art-token/ArtToken.sol

@@ -12,6 +12,7 @@ import {Roles} from "../utils/Roles.sol";
 import {IAuctionHouse} from "../auction-house/IAuctionHouse.sol";
 import {ArtTokenConfigManager} from "./art-token-config-manager/ArtTokenConfigManager.sol";
 import {TokenMintingPermit} from "./libraries/TokenMintingPermit.sol";
+import {ArtTokenRoyaltyManager} from "./ArtTokenRoyaltyManager.sol";
 import {ArtTokenBase} from "./ArtTokenBase.sol";
 import {IArtToken} from "./IArtToken.sol";
 
@@ -22,7 +23,15 @@ import {IArtToken} from "./IArtToken.sol";
  *         logic, integrates EIP-712 permits and enforces optional transfer
  *         restrictions for regulated collections.
  */
-contract ArtToken is IArtToken, ArtTokenBase, EIP712Domain, RoleSystem, Authorization, ArtTokenConfigManager {
+contract ArtToken is
+    IArtToken,
+    ArtTokenBase,
+    EIP712Domain,
+    RoleSystem,
+    Authorization,
+    ArtTokenConfigManager,
+    ArtTokenRoyaltyManager
+{
     // TODO: need to implement method for validation mint conditions (tokenId, URI, config, etc)
     using SafeERC20 for IERC20;
     using TokenMintingPermit for TokenMintingPermit.Type;

contracts/art-token/ArtTokenBase.sol

@@ -8,7 +8,9 @@ import {
 import {
     ERC721EnumerableUpgradeable
 } from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721EnumerableUpgradeable.sol";
+import {IERC165} from "@openzeppelin/contracts/interfaces/IERC165.sol";
 import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
+import {IERC2981} from "@openzeppelin/contracts/interfaces/IERC2981.sol";
 
 /**
  * @title ArtTokenBase
@@ -17,7 +19,7 @@ import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
  *         protocol's ArtToken contracts. Relies on OpenZeppelin upgradeable libraries and
  *         bundles the Enumerable and URIStorage extensions in a single inheritance tree.
  */
-abstract contract ArtTokenBase is ERC721EnumerableUpgradeable, ERC721URIStorageUpgradeable {
+abstract contract ArtTokenBase is ERC721EnumerableUpgradeable, ERC721URIStorageUpgradeable, IERC2981 {
     /**
      * @notice Initializes the token with a `name` and a `symbol`.
      *
@@ -58,12 +60,13 @@ abstract contract ArtTokenBase is ERC721EnumerableUpgradeable, ERC721URIStorageU
     }
 
     /**
-     * @dev An override required by Solidity.
+     * @notice Returns true if the contract implements the interface defined by
+     *         `interfaceId`. See the corresponding EIP-165 standard for more details.
      */
     function supportsInterface(
         bytes4 interfaceId
-    ) public view override(ERC721EnumerableUpgradeable, ERC721URIStorageUpgradeable) returns (bool) {
-        return super.supportsInterface(interfaceId);
+    ) public view override(ERC721EnumerableUpgradeable, ERC721URIStorageUpgradeable, IERC165) returns (bool) {
+        return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
     }
 
     /**

contracts/art-token/ArtTokenRoyaltyManager.sol

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+pragma solidity ^0.8.20;
+
+import {IERC2981} from "@openzeppelin/contracts/interfaces/IERC2981.sol";
+import {ArtTokenConfigManager} from "./art-token-config-manager/ArtTokenConfigManager.sol";
+
+/**
+ * @title ArtTokenRoyaltyManager
+ *
+ * @notice Abstract contract that provides a basic implementation of the EIP-2981 royalty standard.
+ *
+ * @dev This implementation calculates a fixed 5% royalty on the sale price and designates the
+ *      original token creator as the royalty recipient.
+ */
+abstract contract ArtTokenRoyaltyManager is IERC2981, ArtTokenConfigManager {
+    /**
+     * @notice The royalty percentage in basis points (500 = 5%).
+     */
+    uint256 public constant ROYALTY_PERCENT_IN_BP = 500; // 5%
+
+    /**
+     * @notice One hundred percent represented in basis points (10000 = 100%).
+     */
+    uint256 public constant ONE_HUNDRED_PERCENT_IN_BP = 10000; // 100% in basis points
+
+    /**
+     * @notice Calculates the royalty payment for a token sale, returning the recipient's address and the royalty amount.
+     *
+     * @param tokenId The ID of the token for which royalty information is being requested.
+     * @param salePrice The price at which the token was sold.
+     *
+     * @return receiver The address that should receive the royalty payment.
+     * @return royaltyAmount The amount of the royalty payment.
+     */
+    function royaltyInfo(
+        uint256 tokenId,
+        uint256 salePrice
+    ) external view returns (address receiver, uint256 royaltyAmount) {
+        receiver = _tokenCreator(tokenId);
+        royaltyAmount = (salePrice * ROYALTY_PERCENT_IN_BP) / ONE_HUNDRED_PERCENT_IN_BP;
+    }
+}

contracts/art-token/art-token-config-manager/ArtTokenConfigManager.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: GPL-3.0-or-later
 pragma solidity ^0.8.20;
 
 import {RoleSystem} from "../../utils/role-system/RoleSystem.sol";

contracts/utils/currency-manager/CurrencyManager.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: GPL-3.0-or-later
 pragma solidity ^0.8.20;
 
 import {RoleSystem} from "../role-system/RoleSystem.sol";

contracts/utils/currency-manager/CurrencyManagerStorage.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: GPL-3.0-or-later
 pragma solidity ^0.8.20;
 
 /**

contracts/utils/currency-manager/ICurrencyManager.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: GPL-3.0-or-later
 pragma solidity ^0.8.20;
 
 /**