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app/Http/Requests/Folders/StoreRequest.php

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+<?php
+
+namespace App\Http\Requests\Folders;
+
+use App\Models\Folder;
+use App\Models\Group;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class StoreRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        $parentFolder = Folder::find($this->parent_id);
+
+        return $this->user()->can('createIn', $parentFolder);
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        $groupId = $this->group_id;
+
+        return [
+            'title'     => [
+                'required',
+                'max:255',
+            ],
+            // Parent folder ID must exist and in the same group as requested
+            'parent_id' => [
+                'required',
+                Rule::exists(Folder::class, 'id')->where(function ($query) use ($groupId) {
+                    $query->where('group_id', '=', $groupId);
+                }),
+            ],
+            'group_id'  => [
+                'required',
+                Rule::exists(Group::class, 'id'),
+            ],
+        ];
+    }
+}