Add config option to fully disable installing plugins (#6535)

* [FR] Add config option to fully disable installing plugins
Fixes #6531

* also restrict uninstalling

* Added test

* diff cleanup

* extend api to show if install was disabled

* PUI disable install buttons

* CUI disable install button if not available

* add config option

* Rephrase

src/frontend/src/defaults/defaults.tsx

@@ -8,6 +8,7 @@ export const emptyServerAPI = {
   worker_running: null,
   worker_pending_tasks: null,
   plugins_enabled: null,
+  plugins_install_disabled: null,
   active_plugins: [],
   email_configured: null,
   debug_mode: null,

src/frontend/src/states/states.tsx

@@ -34,6 +34,7 @@ export interface ServerAPIProps {
   worker_running: null | boolean;
   worker_pending_tasks: null | number;
   plugins_enabled: null | boolean;
+  plugins_install_disabled: null | boolean;
   active_plugins: PluginProps[];
   email_configured: null | boolean;
   debug_mode: null | boolean;

src/frontend/src/tables/RowActions.tsx

@@ -14,6 +14,7 @@ export type RowAction = {
   icon: ReactNode;
   onClick?: () => void;
   hidden?: boolean;
+  disabled?: boolean;
 };
 
 // Component for duplicating a row in a table
@@ -129,6 +130,7 @@ export function RowActions({
 
             setOpened(false);
           }}
+          disabled={action.disabled || false}
         >
           {action.title}
         </Menu.Item>

src/frontend/src/tables/plugin/PluginListTable.tsx

@@ -271,8 +271,11 @@ export default function PluginListTable() {
   const navigate = useNavigate();
   const user = useUserState();
 
-  const pluginsEnabled = useServerApiState(
-    (state) => state.server.plugins_enabled
+  const [pluginsEnabled, plugins_install_disabled] = useServerApiState(
+    (state) => [
+      state.server.plugins_enabled,
+      state.server.plugins_install_disabled
+    ]
   );
 
   const pluginTableColumns: TableColumn[] = useMemo(
@@ -457,7 +460,8 @@ export default function PluginListTable() {
           onClick: () => {
             setSelectedPlugin(record.pk);
             uninstallPluginModal.open();
-          }
+          },
+          disabled: plugins_install_disabled || false
         });
       }
 
@@ -592,6 +596,7 @@ export default function PluginListTable() {
             setPluginPackage('');
             installPluginModal.open();
           }}
+          disabled={plugins_install_disabled || false}
         />
       );
     }