remove plugin base

src/contracts/plugins/MetadataPlugin.sol

@@ -1,26 +1,36 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {Plugin} from "src/contracts/base/Plugin.sol";
-
 import {IMetadataPlugin} from "src/interfaces/plugins/IMetadataPlugin.sol";
+import {IRegistry} from "src/interfaces/base/IRegistry.sol";
 
 import {Strings} from "@openzeppelin/contracts/utils/Strings.sol";
 
-contract MetadataPlugin is Plugin, IMetadataPlugin {
+contract MetadataPlugin is IMetadataPlugin {
     using Strings for string;
 
+    /**
+     * @inheritdoc IMetadataPlugin
+     */
+    address public immutable REGISTRY;
+
     /**
      * @inheritdoc IMetadataPlugin
      */
     mapping(address entity => string value) public metadataURL;
 
-    constructor(address registry) Plugin(registry) {}
+    constructor(address registry) {
+        REGISTRY = registry;
+    }
 
     /**
      * @inheritdoc IMetadataPlugin
      */
-    function setMetadataURL(string calldata metadataURL_) external onlyEntity {
+    function setMetadataURL(string calldata metadataURL_) external {
+        if (!IRegistry(REGISTRY).isEntity(msg.sender)) {
+            revert NotEntity();
+        }
+
         if (metadataURL[msg.sender].equal(metadataURL_)) {
             revert AlreadySet();
         }

src/contracts/plugins/MiddlewarePlugin.sol

@@ -1,22 +1,32 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {Plugin} from "src/contracts/base/Plugin.sol";
-
 import {IMiddlewarePlugin} from "src/interfaces/plugins/IMiddlewarePlugin.sol";
+import {IRegistry} from "src/interfaces/base/IRegistry.sol";
+
+contract MiddlewarePlugin is IMiddlewarePlugin {
+    /**
+     * @inheritdoc IMiddlewarePlugin
+     */
+    address public immutable REGISTRY;
 
-contract MiddlewarePlugin is Plugin, IMiddlewarePlugin {
     /**
      * @inheritdoc IMiddlewarePlugin
      */
     mapping(address entity => address value) public middleware;
 
-    constructor(address registry) Plugin(registry) {}
+    constructor(address registry) {
+        REGISTRY = registry;
+    }
 
     /**
      * @inheritdoc IMiddlewarePlugin
      */
-    function setMiddleware(address middleware_) external onlyEntity {
+    function setMiddleware(address middleware_) external {
+        if (!IRegistry(REGISTRY).isEntity(msg.sender)) {
+            revert NotEntity();
+        }
+
         if (middleware[msg.sender] == middleware_) {
             revert AlreadySet();
         }

src/contracts/plugins/NetworkOptInPlugin.sol

@@ -1,14 +1,17 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {Plugin} from "src/contracts/base/Plugin.sol";
-
 import {INetworkOptInPlugin} from "src/interfaces/plugins/INetworkOptInPlugin.sol";
 import {IRegistry} from "src/interfaces/base/IRegistry.sol";
 
 import {Time} from "@openzeppelin/contracts/utils/types/Time.sol";
 
-contract NetworkOptInPlugin is Plugin, INetworkOptInPlugin {
+contract NetworkOptInPlugin is INetworkOptInPlugin {
+    /**
+     * @inheritdoc INetworkOptInPlugin
+     */
+    address public immutable NETWORK_REGISTRY;
+
     /**
      * @inheritdoc INetworkOptInPlugin
      */
@@ -25,7 +28,8 @@ contract NetworkOptInPlugin is Plugin, INetworkOptInPlugin {
     mapping(address network => mapping(address resolver => mapping(address where => uint48 timestamp))) public
         lastOptOut;
 
-    constructor(address networkRegistry, address whereRegistry) Plugin(networkRegistry) {
+    constructor(address networkRegistry, address whereRegistry) {
+        NETWORK_REGISTRY = networkRegistry;
         WHERE_REGISTRY = whereRegistry;
     }
 
@@ -44,7 +48,11 @@ contract NetworkOptInPlugin is Plugin, INetworkOptInPlugin {
     /**
      * @inheritdoc INetworkOptInPlugin
      */
-    function optIn(address resolver, address where) external onlyEntity {
+    function optIn(address resolver, address where) external {
+        if (!IRegistry(NETWORK_REGISTRY).isEntity(msg.sender)) {
+            revert NotNetwork();
+        }
+
         if (!IRegistry(WHERE_REGISTRY).isEntity(where)) {
             revert NotWhereEntity();
         }

src/contracts/plugins/OperatorOptInPlugin.sol

@@ -1,14 +1,17 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {Plugin} from "src/contracts/base/Plugin.sol";
-
 import {IOperatorOptInPlugin} from "src/interfaces/plugins/IOperatorOptInPlugin.sol";
 import {IRegistry} from "src/interfaces/base/IRegistry.sol";
 
 import {Time} from "@openzeppelin/contracts/utils/types/Time.sol";
 
-contract OperatorOptInPlugin is Plugin, IOperatorOptInPlugin {
+contract OperatorOptInPlugin is IOperatorOptInPlugin {
+    /**
+     * @inheritdoc IOperatorOptInPlugin
+     */
+    address public immutable OPERATOR_REGISTRY;
+
     /**
      * @inheritdoc IOperatorOptInPlugin
      */
@@ -24,7 +27,8 @@ contract OperatorOptInPlugin is Plugin, IOperatorOptInPlugin {
      */
     mapping(address operator => mapping(address where => uint48 timestamp)) public lastOptOut;
 
-    constructor(address operatorRegistry, address whereRegistry) Plugin(operatorRegistry) {
+    constructor(address operatorRegistry, address whereRegistry) {
+        OPERATOR_REGISTRY = operatorRegistry;
         WHERE_REGISTRY = whereRegistry;
     }
 
@@ -38,7 +42,11 @@ contract OperatorOptInPlugin is Plugin, IOperatorOptInPlugin {
     /**
      * @inheritdoc IOperatorOptInPlugin
      */
-    function optIn(address where) external onlyEntity {
+    function optIn(address where) external {
+        if (!IRegistry(OPERATOR_REGISTRY).isEntity(msg.sender)) {
+            revert NotOperator();
+        }
+
         if (!IRegistry(WHERE_REGISTRY).isEntity(where)) {
             revert NotWhereEntity();
         }

src/interfaces/plugins/IMetadataPlugin.sol

@@ -1,10 +1,9 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {IPlugin} from "src/interfaces/base/IPlugin.sol";
-
-interface IMetadataPlugin is IPlugin {
+interface IMetadataPlugin {
     error AlreadySet();
+    error NotEntity();
 
     /**
      * @notice Emitted when a metadata URL is set for an entity.
@@ -13,6 +12,12 @@ interface IMetadataPlugin is IPlugin {
      */
     event SetMetadataURL(address indexed entity, string metadataURL);
 
+    /**
+     * @notice Get the registry address.
+     * @return address of the registry
+     */
+    function REGISTRY() external view returns (address);
+
     /**
      * @notice Get a URL with an entity's metadata.
      * The metadata should contain a name, description, external_url, and image.

src/interfaces/plugins/IMiddlewarePlugin.sol

@@ -1,10 +1,9 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {IPlugin} from "src/interfaces/base/IPlugin.sol";
-
-interface IMiddlewarePlugin is IPlugin {
+interface IMiddlewarePlugin {
     error AlreadySet();
+    error NotEntity();
 
     /**
      * @notice Emitted when a middleware is set for an entity.
@@ -13,6 +12,12 @@ interface IMiddlewarePlugin is IPlugin {
      */
     event SetMiddleware(address indexed entity, address middleware);
 
+    /**
+     * @notice Get the registry address.
+     * @return address of the registry
+     */
+    function REGISTRY() external view returns (address);
+
     /**
      * @notice Get an entity's middleware.
      * @param entity address of the entity

src/interfaces/plugins/INetworkOptInPlugin.sol

@@ -1,12 +1,11 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {IPlugin} from "src/interfaces/base/IPlugin.sol";
-
-interface INetworkOptInPlugin is IPlugin {
+interface INetworkOptInPlugin {
     error AlreadyOptedIn();
     error NotOptedIn();
     error NotWhereEntity();
+    error NotNetwork();
 
     /**
      * @notice Emitted when a network opts-in to a "where" entity.
@@ -24,6 +23,12 @@ interface INetworkOptInPlugin is IPlugin {
      */
     event OptOut(address indexed network, address indexed resolver, address indexed where);
 
+    /**
+     * @notice Get the network registry's address.
+     * @return address of the network registry
+     */
+    function NETWORK_REGISTRY() external view returns (address);
+
     /**
      * @notice Get the address of the registry where to opt-in.
      * @return address of the "where" registry

src/interfaces/plugins/IOperatorOptInPlugin.sol

@@ -1,12 +1,11 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import {IPlugin} from "src/interfaces/base/IPlugin.sol";
-
-interface IOperatorOptInPlugin is IPlugin {
+interface IOperatorOptInPlugin {
     error AlreadyOptedIn();
     error NotOptedIn();
     error NotWhereEntity();
+    error NotOperator();
 
     /**
      * @notice Emitted when an operator opts-in to a "where" entity.
@@ -22,6 +21,12 @@ interface IOperatorOptInPlugin is IPlugin {
      */
     event OptOut(address indexed operator, address indexed where);
 
+    /**
+     * @notice Get the operator registry's address.
+     * @return address of the operator registry
+     */
+    function OPERATOR_REGISTRY() external view returns (address);
+
     /**
      * @notice Get the address of the registry where to opt-in.
      * @return address of the "where" registry