Fix not being able to unfavorite toots one has lost access to (#15192)

Fixes #15191

app/controllers/api/v1/statuses/favourites_controller.rb

@@ -5,7 +5,7 @@ class Api::V1::Statuses::FavouritesController < Api::BaseController
 
   before_action -> { doorkeeper_authorize! :write, :'write:favourites' }
   before_action :require_user!
-  before_action :set_status
+  before_action :set_status, only: [:create]
 
   def create
     FavouriteService.new.call(current_account, @status)
@@ -13,8 +13,19 @@ class Api::V1::Statuses::FavouritesController < Api::BaseController
   end
 
   def destroy
-    UnfavouriteWorker.perform_async(current_account.id, @status.id)
+    fav = current_account.favourites.find_by(status_id: params[:status_id])
+
+    if fav
+      @status = fav.status
+      UnfavouriteWorker.perform_async(current_account.id, @status.id)
+    else
+      @status = Status.find(params[:status_id])
+      authorize @status, :show?
+    end
+
     render json: @status, serializer: REST::StatusSerializer, relationships: StatusRelationshipsPresenter.new([@status], current_account.id, favourites_map: { @status.id => false })
+  rescue Mastodon::NotPermittedError
+    not_found
   end
 
   private

spec/controllers/api/v1/statuses/favourites_controller_spec.rb

@@ -82,6 +82,31 @@ describe Api::V1::Statuses::FavouritesController do
         end
       end
 
+      context 'with public status when blocked by its author' do
+        let(:status) { Fabricate(:status) }
+
+        before do
+          FavouriteService.new.call(user.account, status)
+          status.account.block!(user.account)
+          post :destroy, params: { status_id: status.id }
+        end
+
+        it 'returns http success' do
+          expect(response).to have_http_status(200)
+        end
+
+        it 'updates the favourite attribute' do
+          expect(user.account.favourited?(status)).to be false
+        end
+
+        it 'returns json with updated attributes' do
+          hash_body = body_as_json
+
+          expect(hash_body[:id]).to eq status.id.to_s
+          expect(hash_body[:favourited]).to be false
+        end
+      end
+
       context 'with private status that was not favourited' do
         let(:status) { Fabricate(:status, visibility: :private) }