build the backend structure and the fe for the Game

app/Http/Requests/JoinRoomRequest.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Models\Player;
+use App\Models\Room;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class JoinRoomRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    protected function prepareForValidation(): void
+    {
+        $this->merge([
+            'join_code' => strtoupper(trim((string) $this->input('join_code'))),
+            'player_name' => trim((string) $this->input('player_name')),
+        ]);
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        $roomId = Room::query()
+            ->where('join_code', $this->input('join_code'))
+            ->value('id');
+
+        return [
+            'join_code' => ['bail', 'string', 'required', 'size:6', Rule::exists(Room::class, 'join_code')],
+            'player_name' => ['required', 'string', 'max:50', Rule::unique(Player::class, 'name')->where('room_id', $roomId)],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'join_code.exists' => 'Dieser Raumcode existiert nicht.',
+            'join_code.size' => 'Der Raumcode muss aus sechs Zeichen bestehen.',
+            'player_name.unique' => 'Dieser Name wird in dem Raum bereits verwendet.',
+        ];
+    }
+}