Fix Undo Announce sometimes inlining the originally Announced status (#17516)

* Change tests to have more specific expectations on sent ActivityPub payloads

* Check that payload doesn't actually contain the contents of the boosted toot

* Fix Undo Announce sometimes inlining the originally Announced status

app/presenters/activitypub/activity_presenter.rb

@@ -4,7 +4,7 @@ class ActivityPub::ActivityPresenter < ActiveModelSerializers::Model
   attributes :id, :type, :actor, :published, :to, :cc, :virtual_object
 
   class << self
-    def from_status(status)
+    def from_status(status, allow_inlining: true)
       new.tap do |presenter|
         presenter.id        = ActivityPub::TagManager.instance.activity_uri_for(status)
         presenter.type      = status.reblog? ? 'Announce' : 'Create'
@@ -15,7 +15,7 @@ class ActivityPub::ActivityPresenter < ActiveModelSerializers::Model
 
         presenter.virtual_object = begin
           if status.reblog?
-            if status.account == status.proper.account && status.proper.private_visibility? && status.local?
+            if allow_inlining && status.account == status.proper.account && status.proper.private_visibility? && status.local?
               status.proper
             else
               ActivityPub::TagManager.instance.uri_for(status.proper)

app/serializers/activitypub/undo_announce_serializer.rb

@@ -22,6 +22,6 @@ class ActivityPub::UndoAnnounceSerializer < ActivityPub::Serializer
   end
 
   def virtual_object
-    ActivityPub::ActivityPresenter.from_status(object)
+    ActivityPub::ActivityPresenter.from_status(object, allow_inlining: false)
   end
 end

spec/services/remove_status_service_spec.rb

@@ -15,8 +15,11 @@ RSpec.describe RemoveStatusService, type: :service do
 
     jeff.follow!(alice)
     hank.follow!(alice)
+  end
 
-    @status = PostStatusService.new.call(alice, text: 'Hello @bob@example.com')
+  context 'when removed status is not a reblog' do
+    before do
+      @status = PostStatusService.new.call(alice, text: 'Hello @bob@example.com ThisIsASecret')
       FavouriteService.new.call(jeff, @status)
       Fabricate(:status, account: bill, reblog: @status, uri: 'hoge')
     end
@@ -31,14 +34,32 @@ RSpec.describe RemoveStatusService, type: :service do
       expect(HomeFeed.new(jeff).get(10)).to_not include(@status.id)
     end
 
-  it 'sends delete activity to followers' do
+    it 'sends Delete activity to followers' do
       subject.call(@status)
-    expect(a_request(:post, 'http://example.com/inbox')).to have_been_made.twice
+      expect(a_request(:post, 'http://example.com/inbox').with(
+        body: hash_including({
+          'type' => 'Delete',
+          'object' => {
+            'type' => 'Tombstone',
+            'id' => ActivityPub::TagManager.instance.uri_for(@status),
+            'atomUri' => OStatus::TagManager.instance.uri_for(@status),
+          },
+        })
+      )).to have_been_made.once
     end
 
-  it 'sends delete activity to rebloggers' do
+    it 'sends Delete activity to rebloggers' do
       subject.call(@status)
-    expect(a_request(:post, 'http://example2.com/inbox')).to have_been_made
+      expect(a_request(:post, 'http://example2.com/inbox').with(
+        body: hash_including({
+          'type' => 'Delete',
+          'object' => {
+            'type' => 'Tombstone',
+            'id' => ActivityPub::TagManager.instance.uri_for(@status),
+            'atomUri' => OStatus::TagManager.instance.uri_for(@status),
+          },
+        })
+      )).to have_been_made.once
     end
 
     it 'remove status from notifications' do
@@ -46,4 +67,45 @@ RSpec.describe RemoveStatusService, type: :service do
         Notification.where(activity_type: 'Favourite', from_account: jeff, account: alice).count
       }.from(1).to(0)
     end
+  end
+
+  context 'when removed status is a private self-reblog' do
+    before do
+      @original_status = Fabricate(:status, account: alice, text: 'Hello ThisIsASecret', visibility: :private)
+      @status = ReblogService.new.call(alice, @original_status)
+    end
+
+    it 'sends Undo activity to followers' do
+      subject.call(@status)
+      expect(a_request(:post, 'http://example.com/inbox').with(
+        body: hash_including({
+          'type' => 'Undo',
+          'object' => hash_including({
+            'type' => 'Announce',
+            'object' => ActivityPub::TagManager.instance.uri_for(@original_status),
+          }),
+        })
+      )).to have_been_made.once
+    end
+  end
+
+  context 'when removed status is public self-reblog' do
+    before do
+      @original_status = Fabricate(:status, account: alice, text: 'Hello ThisIsASecret', visibility: :public)
+      @status = ReblogService.new.call(alice, @original_status)
+    end
+
+    it 'sends Undo activity to followers' do
+      subject.call(@status)
+      expect(a_request(:post, 'http://example.com/inbox').with(
+        body: hash_including({
+          'type' => 'Undo',
+          'object' => hash_including({
+            'type' => 'Announce',
+            'object' => ActivityPub::TagManager.instance.uri_for(@original_status),
+          }),
+        })
+      )).to have_been_made.once
+    end
+  end
 end