feat: basic admin interface

server/utils/instance.ts

@@ -0,0 +1,27 @@
+import { INSTANCE_SETTINGS_ID, REGISTRATION_MODES, type RegistrationMode } from '../../drizzle/schema';
+import { db } from '../lib/db';
+
+/**
+ * DISABLE_SIGNUP in the environment wins over whatever admins pick in the UI,
+ * so a deployment that was locked down this way stays locked down.
+ */
+export const isRegistrationLocked = (): boolean => {
+    const value = process.env.DISABLE_SIGNUP?.toLowerCase();
+
+    return value === 'true' || value === '1';
+};
+
+export const getRegistrationMode = async (): Promise<RegistrationMode> => {
+    if (isRegistrationLocked()) return 'closed';
+
+    const row = await db.query.instanceSettings.findFirst({
+        where: {
+            id: INSTANCE_SETTINGS_ID,
+        },
+    });
+
+    const mode = row?.registration;
+
+    // instances that never touched the setting keep taking sign ups like before
+    return mode !== undefined && REGISTRATION_MODES.includes(mode) ? mode : 'open';
+};