feat: Initial commit for Saqel Platform architecture, backend, Docker, and documentation

backend/app/Http/Middleware/ApiTokenAuth.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Models\User;
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Str;
+use Symfony\Component\HttpFoundation\Response;
+
+class ApiTokenAuth
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        $token = $request->bearerToken();
+
+        if ($token === null || Str::length($token) < 32) {
+            return response()->json(['message' => 'Unauthenticated.'], 401);
+        }
+
+        /** @var User|null $user */
+        $user = User::query()->where('api_token', $token)->first();
+
+        if ($user === null) {
+            return response()->json(['message' => 'Unauthenticated.'], 401);
+        }
+
+        $request->setUserResolver(fn () => $user);
+
+        return $next($request);
+    }
+}