Separated laravel app to its own folder (#540)

api/app/Http/Middleware/CustomDomainRestriction.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Http\Requests\Workspace\CustomDomainRequest;
+use App\Models\Forms\Form;
+use App\Models\Workspace;
+use Closure;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Http\Request;
+
+class CustomDomainRestriction
+{
+    public const CUSTOM_DOMAIN_HEADER = 'x-custom-domain';
+
+    /**
+     * Handle an incoming request.
+     */
+    public function handle(Request $request, Closure $next)
+    {
+        if (! $request->hasHeader(self::CUSTOM_DOMAIN_HEADER) || ! config('custom-domains.enabled')) {
+            return $next($request);
+        }
+
+        $customDomain = $request->header(self::CUSTOM_DOMAIN_HEADER);
+        if (! preg_match(CustomDomainRequest::CUSTOM_DOMAINS_REGEX, $customDomain)) {
+            return response()->json([
+                'success' => false,
+                'message' => 'Invalid domain',
+                'error' => 'invalid_domain',
+            ], 420);
+        }
+
+        // Check if domain is different from current domain
+        $notionFormsDomain = parse_url(config('app.url'))['host'];
+        if ($customDomain == $notionFormsDomain) {
+            return $next($request);
+        }
+
+        // Check if domain is known
+        if (! $workspaces = Workspace::whereJsonContains('custom_domains', $customDomain)->get()) {
+            return response()->json([
+                'success' => false,
+                'message' => 'Unknown domain',
+                'error' => 'invalid_domain',
+            ], 420);
+        }
+
+        $workspacesIds = $workspaces->pluck('id')->toArray();
+        Workspace::addGlobalScope('domain-restricted', function (Builder $builder) use ($workspacesIds) {
+            $builder->whereIn('id', $workspacesIds);
+        });
+        Form::addGlobalScope('domain-restricted', function (Builder $builder) use ($workspacesIds) {
+            $builder->whereIn('workspace_id', $workspacesIds);
+        });
+
+        return $next($request);
+    }
+}