Do not allow adding votes to expired polls (#10214)

* Do not allow adding votes to expired polls

* Only validate expires_at on create

spec/lib/activitypub/activity/create_spec.rb

@@ -482,6 +482,28 @@ RSpec.describe ActivityPub::Activity::Create do
           expect(poll.reload.cached_tallies).to eq [1, 0]
         end
       end
+
+      context 'when a vote to an expired local poll' do
+        let(:poll) do
+          poll = Fabricate.build(:poll, options: %w(Yellow Blue), expires_at: 1.day.ago)
+          poll.save(validate: false)
+          poll
+        end
+        let!(:local_status) { Fabricate(:status, owned_poll: poll) }
+
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            name: 'Yellow',
+            inReplyTo: ActivityPub::TagManager.instance.uri_for(local_status)
+          }
+        end
+
+        it 'does not add a vote to the poll' do
+          expect(poll.votes.first).to be_nil
+        end
+      end
     end
 
     context 'when sender is followed by local users' do