Adding Custom domains (#247)

* WIP

* wip

* Finished doing most of the work

app/Http/Controllers/CaddyController.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Workspace;
+use Illuminate\Http\Request;
+
+class CaddyController extends Controller
+{
+    public function ask(Request $request)
+    {
+        $request->validate([
+            'domain' => 'required|string',
+        ]);
+        // make sure domain is valid
+        $domain = $request->input('domain');
+        if (!preg_match('/^[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}$/', $domain)) {
+            return $this->error([
+                'success' => false,
+                'message' => 'Invalid domain',
+            ]);
+        }
+
+        if (Workspace::whereJsonContains('custom_domains',$domain)->exists()) {
+            return $this->success([
+                'success' => true,
+                'message' => 'OK',
+            ]);
+        }
+
+        return $this->error([
+            'success' => false,
+            'message' => 'Unauthorized domain',
+        ]);
+    }
+}