Undoing: Move undoing announcements to the pipeline everywhere.

lib/pleroma/user.ex

@@ -1554,7 +1554,7 @@ defp delete_activity(%{data: %{"type" => "Create"}} = activity) do
     |> ActivityPub.delete()
   end
 
-  defp delete_activity(%{data: %{"type" => "Like"}} = activity) do
+  defp delete_activity(%{data: %{"type" => type}} = activity) when type in ["Like", "Announce"] do
     actor =
       activity.actor
       |> get_cached_by_ap_id()
@@ -1564,14 +1564,6 @@ defp delete_activity(%{data: %{"type" => "Like"}} = activity) do
     Pipeline.common_pipeline(undo, local: true)
   end
 
-  defp delete_activity(%{data: %{"type" => "Announce"}} = activity) do
-    object = Object.normalize(activity)
-
-    activity.actor
-    |> get_cached_by_ap_id()
-    |> ActivityPub.unannounce(object)
-  end
-
   defp delete_activity(_activity), do: "Doing nothing"
 
   def html_filter_policy(%User{no_rich_text: true}) do

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -402,34 +402,6 @@ defp do_announce(user, object, activity_id, local, public) do
     end
   end
 
-  @spec unannounce(User.t(), Object.t(), String.t() | nil, boolean()) ::
-          {:ok, Activity.t(), Object.t()} | {:ok, Object.t()} | {:error, any()}
-  def unannounce(
-        %User{} = actor,
-        %Object{} = object,
-        activity_id \\ nil,
-        local \\ true
-      ) do
-    with {:ok, result} <-
-           Repo.transaction(fn -> do_unannounce(actor, object, activity_id, local) end) do
-      result
-    end
-  end
-
-  defp do_unannounce(actor, object, activity_id, local) do
-    with %Activity{} = announce_activity <- get_existing_announce(actor.ap_id, object),
-         unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id),
-         {:ok, unannounce_activity} <- insert(unannounce_data, local),
-         :ok <- maybe_federate(unannounce_activity),
-         {:ok, _activity} <- Repo.delete(announce_activity),
-         {:ok, object} <- remove_announce_from_object(announce_activity, object) do
-      {:ok, unannounce_activity, object}
-    else
-      nil -> {:ok, object}
-      {:error, error} -> Repo.rollback(error)
-    end
-  end
-
   @spec follow(User.t(), User.t(), String.t() | nil, boolean()) ::
           {:ok, Activity.t()} | {:error, any()}
   def follow(follower, followed, activity_id \\ nil, local \\ true) do

lib/pleroma/web/activity_pub/side_effects.ex

@@ -53,5 +53,13 @@ def handle_undoing(%{data: %{"type" => "EmojiReact"}} = object) do
     end
   end
 
+  def handle_undoing(%{data: %{"type" => "Announce"}} = object) do
+    with %Object{} = liked_object <- Object.get_by_ap_id(object.data["object"]),
+         {:ok, _} <- Utils.remove_announce_from_object(object, liked_object),
+         {:ok, _} <- Repo.delete(object) do
+      :ok
+    end
+  end
+
   def handle_undoing(object), do: {:error, ["don't know how to handle", object]}
 end

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -768,25 +768,6 @@ def handle_incoming(
     end
   end
 
-  def handle_incoming(
-        %{
-          "type" => "Undo",
-          "object" => %{"type" => "Announce", "object" => object_id},
-          "actor" => _actor,
-          "id" => id
-        } = data,
-        _options
-      ) do
-    with actor <- Containment.get_actor(data),
-         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
-         {:ok, object} <- get_obj_helper(object_id),
-         {:ok, activity, _} <- ActivityPub.unannounce(actor, object, id, false) do
-      {:ok, activity}
-    else
-      _e -> :error
-    end
-  end
-
   def handle_incoming(
         %{
           "type" => "Undo",
@@ -847,7 +828,7 @@ def handle_incoming(
         } = data,
         _options
       )
-      when type in ["Like", "EmojiReact"] do
+      when type in ["Like", "EmojiReact", "Announce"] do
     with {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
       {:ok, activity}
     end

lib/pleroma/web/common_api/common_api.ex

@@ -107,9 +107,12 @@ def repeat(id, user, params \\ %{}) do
 
   def unrepeat(id, user) do
     with {_, %Activity{data: %{"type" => "Create"}} = activity} <-
-           {:find_activity, Activity.get_by_id(id)} do
-      object = Object.normalize(activity)
-      ActivityPub.unannounce(user, object)
+           {:find_activity, Activity.get_by_id(id)},
+         %Object{} = note <- Object.normalize(activity, false),
+         %Activity{} = announce <- Utils.get_existing_announce(user.ap_id, note),
+         {:ok, undo, _} <- Builder.undo(user, announce),
+         {:ok, activity, _} <- Pipeline.common_pipeline(undo, local: true) do
+      {:ok, activity}
     else
       {:find_activity, _} -> {:error, :not_found}
       _ -> {:error, dgettext("errors", "Could not unrepeat")}

lib/pleroma/web/mastodon_api/controllers/status_controller.ex

@@ -206,9 +206,9 @@ def reblog(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id} = params) do
   end
 
   @doc "POST /api/v1/statuses/:id/unreblog"
-  def unreblog(%{assigns: %{user: user}} = conn, %{"id" => ap_id_or_id}) do
-    with {:ok, _unannounce, %{data: %{"id" => id}}} <- CommonAPI.unrepeat(ap_id_or_id, user),
-         %Activity{} = activity <- Activity.get_create_by_object_ap_id_with_object(id) do
+  def unreblog(%{assigns: %{user: user}} = conn, %{"id" => activity_id}) do
+    with {:ok, _unannounce} <- CommonAPI.unrepeat(activity_id, user),
+         %Activity{} = activity <- Activity.get_by_id(activity_id) do
       try_render(conn, "show.json", %{activity: activity, for: user, as: :activity})
     end
   end

test/notification_test.exs

@@ -758,7 +758,7 @@ test "repeating an activity results in 1 notification, then 0 if the activity is
 
       assert length(Notification.for_user(user)) == 1
 
-      {:ok, _, _} = CommonAPI.unrepeat(activity.id, other_user)
+      {:ok, _} = CommonAPI.unrepeat(activity.id, other_user)
 
       assert Enum.empty?(Notification.for_user(user))
     end

test/web/activity_pub/activity_pub_test.exs

@@ -1008,52 +1008,6 @@ test "does not add an announce activity to the db if the announcer is not the au
     end
   end
 
-  describe "unannouncing an object" do
-    test "unannouncing a previously announced object" do
-      note_activity = insert(:note_activity)
-      object = Object.normalize(note_activity)
-      user = insert(:user)
-
-      # Unannouncing an object that is not announced does nothing
-      {:ok, object} = ActivityPub.unannounce(user, object)
-      refute object.data["announcement_count"]
-
-      {:ok, announce_activity, object} = ActivityPub.announce(user, object)
-      assert object.data["announcement_count"] == 1
-
-      {:ok, unannounce_activity, object} = ActivityPub.unannounce(user, object)
-      assert object.data["announcement_count"] == 0
-
-      assert unannounce_activity.data["to"] == [
-               User.ap_followers(user),
-               object.data["actor"]
-             ]
-
-      assert unannounce_activity.data["type"] == "Undo"
-      assert unannounce_activity.data["object"] == announce_activity.data
-      assert unannounce_activity.data["actor"] == user.ap_id
-      assert unannounce_activity.data["context"] == announce_activity.data["context"]
-
-      assert Activity.get_by_id(announce_activity.id) == nil
-    end
-
-    test "reverts unannouncing on error" do
-      note_activity = insert(:note_activity)
-      object = Object.normalize(note_activity)
-      user = insert(:user)
-
-      {:ok, _announce_activity, object} = ActivityPub.announce(user, object)
-      assert object.data["announcement_count"] == 1
-
-      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
-        assert {:error, :reverted} = ActivityPub.unannounce(user, object)
-      end
-
-      object = Object.get_by_ap_id(object.data["id"])
-      assert object.data["announcement_count"] == 1
-    end
-  end
-
   describe "uploading files" do
     test "copies the file to the configured folder" do
       file = %Plug.Upload{

test/web/activity_pub/side_effects_test.exs

@@ -22,8 +22,8 @@ defmodule Pleroma.Web.ActivityPub.SideEffectsTest do
       user = insert(:user)
       {:ok, post} = CommonAPI.post(poster, %{"status" => "hey"})
       {:ok, like} = CommonAPI.favorite(user, post.id)
-
       {:ok, reaction, _} = CommonAPI.react_with_emoji(post.id, user, "👍")
+      {:ok, announce, _} = CommonAPI.repeat(post.id, user)
 
       {:ok, undo_data, _meta} = Builder.undo(user, like)
       {:ok, like_undo, _meta} = ActivityPub.persist(undo_data, local: true)
@@ -31,15 +31,37 @@ defmodule Pleroma.Web.ActivityPub.SideEffectsTest do
       {:ok, undo_data, _meta} = Builder.undo(user, reaction)
       {:ok, reaction_undo, _meta} = ActivityPub.persist(undo_data, local: true)
 
+      {:ok, undo_data, _meta} = Builder.undo(user, announce)
+      {:ok, announce_undo, _meta} = ActivityPub.persist(undo_data, local: true)
+
       %{
         like_undo: like_undo,
         post: post,
         like: like,
         reaction_undo: reaction_undo,
-        reaction: reaction
+        reaction: reaction,
+        announce_undo: announce_undo,
+        announce: announce
       }
     end
 
+    test "an announce undo removes the announce from the object", %{
+      announce_undo: announce_undo,
+      post: post
+    } do
+      {:ok, _announce_undo, _} = SideEffects.handle(announce_undo)
+
+      object = Object.get_by_ap_id(post.data["object"])
+
+      assert object.data["announcement_count"] == 0
+      assert object.data["announcements"] == []
+    end
+
+    test "deletes the original announce", %{announce_undo: announce_undo, announce: announce} do
+      {:ok, _announce_undo, _} = SideEffects.handle(announce_undo)
+      refute Activity.get_by_id(announce.id)
+    end
+
     test "a reaction undo removes the reaction from the object", %{
       reaction_undo: reaction_undo,
       post: post

test/web/activity_pub/transmogrifier/undo_handling_test.exs

@@ -125,11 +125,8 @@ test "it works for incoming unannounces with an existing notice" do
     {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
 
     assert data["type"] == "Undo"
-    assert object_data = data["object"]
-    assert object_data["type"] == "Announce"
-    assert object_data["object"] == activity.data["object"]
 
-    assert object_data["id"] ==
+    assert data["object"] ==
              "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
   end