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app/Http/Requests/Folders/SetPermissionsRequest.php

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+<?php
+
+namespace App\Http\Requests\Folders;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class SetPermissionsRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        return $this->user()->can('setPermission', $this->folder);
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'ability' => [
+                'nullable',
+                Rule::in([
+                    'can_create_folder',
+                    'can_update_folder',
+                    'can_delete_folder',
+                    'can_create_document',
+                    'can_delete_document',
+                ]),
+            ],
+            'granted' => [
+                'nullable',
+                'boolean',
+            ],
+            'user_id' => [
+                'nullable',
+                Rule::exists('users', 'id'),
+            ],
+        ];
+    }
+}

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'),
+            ],
+        ];
+    }
+}

app/Http/Requests/Folders/UpdateRequest.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace App\Http\Requests\Folders;
+
+use App\Models\Folder;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        if (empty($this->parent_id)) {
+            return 'root' === $this->folder->type;
+        }
+
+        $parent = Folder::find($this->parent_id);
+
+        return $this->user()->can('createIn', $parent) && $this->user()->can('update', $this->folder);
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        $groupId = $this->group_id;
+
+        return [
+            'title'       => [
+                'required',
+                'max:255',
+            ],
+            'parent_id'   => [
+                'nullable',
+                Rule::exists('App\Models\Folder', 'id')->where(function ($query) use ($groupId) {
+                    $query->where('group_id', '=', $groupId);
+                }),
+            ],
+            'group_id'    => [
+                'required',
+                Rule::exists('App\Models\Group', 'id'),
+            ],
+            'is_expanded' => [
+                'sometimes',
+                'boolean',
+            ],
+        ];
+    }
+
+    /**
+     * Configure the validator instance.
+     *
+     * @param \Illuminate\Validation\Validator $validator
+     */
+    public function withValidator($validator)
+    {
+        $validator->after(function ($validator) {
+            if ($this->isMoving()) {
+                if ('folder' !== $this->folder->type) {
+                    // Trying to move a "special" folder like root
+                    $validator->errors()->add('parent_id', __('You cannot move this folder'));
+                } elseif ($this->targetParentIsDescendant()) {
+                    $validator->errors()->add('parent_id', __('You cannot move this folder to a descendant'));
+                }
+            }
+        });
+    }
+
+    /**
+     * Return a boolean value indicating if we're moving a folder.
+     *
+     * @return bool
+     */
+    private function isMoving()
+    {
+        return $this->parent_id !== $this->folder->parent_id;
+    }
+
+    /**
+     * Return a boolean value indicating if we're trying to move a folder into
+     * one of its descendants.
+     *
+     * @return bool
+     */
+    private function targetParentIsDescendant()
+    {
+        $parent = Folder::find($this->parent_id);
+
+        while ($parent) {
+            if ($parent->id === $this->folder->id) {
+                return true;
+            }
+
+            $parent = $parent->parent;
+        }
+
+        return false;
+    }
+}