Improve wg-ui host setup: IP availability checks and current-user install script

- setup-main-host-button: live availability status, grab-next-subnet helper, error/success feedback
- setup-wireguard-host: harden generated shell scripts with set -e
- check-private-ip-address-availability: add user access check, drop manual body validation
- setup-main-host: pass host object with wg_ip_address
- install-wg-ui.sh: run service as the invoking user (root or sudo) instead of a dedicated wgui user, and skip systemd/OpenRC daemon setup when NODE_ENV=development

src/pages/api/admin/check-private-ip-address-availability.ts

@@ -1,3 +1,4 @@
+import checkUserAccess from "@/src/functions/backend/auth/check-user-access";
 import userAuth from "@/src/functions/backend/auth/user-auth";
 import checkPrivateIPAvailability from "@/src/functions/backend/setup/check-private-ip-availability";
 import type { ApiReqParams } from "@/src/types";
@@ -11,7 +12,7 @@ export const handler: BunextAPIRouteHandler<APIResponseObject> = async (
     params,
 ) => {
     const req = params.req;
-    const body = params.body as ApiReqParams | undefined;
+    const body = params.body as ApiReqParams;
 
     if (req.method !== "POST") {
         return {
@@ -30,17 +31,13 @@ export const handler: BunextAPIRouteHandler<APIResponseObject> = async (
     }
 
     try {
-        const ip_address = body?.ip_address;
-
-        if (!ip_address) {
-            throw new Error(`No IP address passed!`);
-        }
-
-        return await checkPrivateIPAvailability({ ip_address });
+        return await checkPrivateIPAvailability({
+            ip_address: body?.ip_address || "",
+        });
     } catch (error: any) {
         return {
             success: false,
             msg: error.message,
         };
     }
-};
+};

src/pages/api/admin/setup-main-host.ts

@@ -41,7 +41,9 @@ export const handler: BunextAPIRouteHandler<APIResponseObject> = async (
         }
 
         return await setupWireguardHost({
-            wg_subnet_ip: body.ip_address,
+            host: {
+                wg_ip_address: body.ip_address,
+            },
         });
     } catch (error: any) {
         return {