Played around with a new app structure

app/Activity/Controllers/CommentController.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace BookStack\Activity\Controllers;
+
+use BookStack\Activity\CommentRepo;
+use BookStack\Entities\Models\Page;
+use BookStack\Http\Controllers\Controller;
+use Illuminate\Http\Request;
+use Illuminate\Validation\ValidationException;
+
+class CommentController extends Controller
+{
+    protected $commentRepo;
+
+    public function __construct(CommentRepo $commentRepo)
+    {
+        $this->commentRepo = $commentRepo;
+    }
+
+    /**
+     * Save a new comment for a Page.
+     *
+     * @throws ValidationException
+     */
+    public function savePageComment(Request $request, int $pageId)
+    {
+        $this->validate($request, [
+            'text'      => ['required', 'string'],
+            'parent_id' => ['nullable', 'integer'],
+        ]);
+
+        $page = Page::visible()->find($pageId);
+        if ($page === null) {
+            return response('Not found', 404);
+        }
+
+        // Prevent adding comments to draft pages
+        if ($page->draft) {
+            return $this->jsonError(trans('errors.cannot_add_comment_to_draft'), 400);
+        }
+
+        // Create a new comment.
+        $this->checkPermission('comment-create-all');
+        $comment = $this->commentRepo->create($page, $request->get('text'), $request->get('parent_id'));
+
+        return view('comments.comment', ['comment' => $comment]);
+    }
+
+    /**
+     * Update an existing comment.
+     *
+     * @throws ValidationException
+     */
+    public function update(Request $request, int $commentId)
+    {
+        $this->validate($request, [
+            'text' => ['required', 'string'],
+        ]);
+
+        $comment = $this->commentRepo->getById($commentId);
+        $this->checkOwnablePermission('page-view', $comment->entity);
+        $this->checkOwnablePermission('comment-update', $comment);
+
+        $comment = $this->commentRepo->update($comment, $request->get('text'));
+
+        return view('comments.comment', ['comment' => $comment]);
+    }
+
+    /**
+     * Delete a comment from the system.
+     */
+    public function destroy(int $id)
+    {
+        $comment = $this->commentRepo->getById($id);
+        $this->checkOwnablePermission('comment-delete', $comment);
+
+        $this->commentRepo->delete($comment);
+
+        return response()->json(['message' => trans('entities.comment_deleted')]);
+    }
+}