试图编写策略以启用Laravel中的帖子评论

Question

In laravel I have a Follower table that I use to check if a User is folowing another User and also if he can comment on Posts.

The table is like this:

Schema::create('followers', function (Blueprint $table) {

            $table->unsignedInteger('publisher_id')->unsigned();
            $table->unsignedInteger('follower_id')->unsigned();
            $table->boolean('enable_follow')->default('1');
            $table->unique(['publisher_id', 'follower_id']);
            $table->timestamps();


            $table->foreign('publisher_id')
                ->references('id')
                ->on('users')
                ->onDelete('cascade');

            $table->foreign('follower_id')
                ->references('id')
                ->on('users')
                ->onDelete('cascade');


        });

and these are the checks that I make to decide if a User can comment a Post:

public function canComment(User $user, Post $post)
{

    $following = Follower::where('follower_id', $user->id)->where('publisher_id', $post->user_id)->select('enable_follow')->get();

    if (!$following->isEmpty()) {

        $enabled = $following[0]['enable_follow'];

        if ($enabled != '0') {

            return true;

        } else {

            return false;

        }
    } else if ($following->isEmpty()) {

        return true;

    }

}

And this is the controller part for storing, as You can see I'm trying to authorize like this: $this->authorize('canComment', $post[0]);

public function store(Request $request)
    {


        //on_post, from_user, body
        // define rules
        $rules = array(

            'post_id' => 'required',
            'body' => 'required'
        );

        $validator = Validator::make(Input::all(), $rules);

        $post_id = $request->input('post_id');

        $post = Post::findOrFail($post_id);   

        if ($validator->fails()) {
            return Response()->json($validator);
        } else {

            $this->authorize('canComment', $post);

            //prepares object to be stored in DB
            $comment = new Comment();

            $comment['user_id'] = $request->user()->id;
            $comment['post_id'] = $post_id;
            $comment['body'] = $request->input('body');
            $comment->save();
            if ($comment) {

                $comment['user_name'] = $request->user()->username;
                $comment['comment_id'] = $comment->id;
                $comment['token'] = $request->input('_token');
            }

            return Response()->json($comment);


        }
    }

The problem here is I get a 403 (Forbidden) error in a situation where I have $following empty and where following is enabled. The Policy is not working as expected.

Source code for authorize method in Gate facade:

public function authorize($ability, $arguments = [])
    {
        $result = $this->raw($ability, $arguments);

        if ($result instanceof Response) {
            return $result;
        }

        return $result ? $this->allow() : $this->deny();
    }

Maybe I am not correct returing true or false in the policy as this code expect the result to be an instance of Response but so what do you return to grant or deny access??

Answer 1

问题在于将策略放入commentPolicy中，因此它希望收到一个Comment而不是Post，将其移动到postPolicy即可解决。