Make sure object refetching follows update rules

changelog.d/3883.fix

@@ -0,0 +1 @@
+Fix abnormal behaviour when refetching a poll

lib/pleroma/object/fetcher.ex

@@ -8,77 +8,30 @@ defmodule Pleroma.Object.Fetcher do
   alias Pleroma.Maps
   alias Pleroma.Object
   alias Pleroma.Object.Containment
-  alias Pleroma.Repo
   alias Pleroma.Signature
   alias Pleroma.Web.ActivityPub.InternalFetchActor
+  alias Pleroma.Web.ActivityPub.MRF
   alias Pleroma.Web.ActivityPub.ObjectValidator
+  alias Pleroma.Web.ActivityPub.Pipeline
   alias Pleroma.Web.ActivityPub.Transmogrifier
   alias Pleroma.Web.Federator
 
   require Logger
   require Pleroma.Constants
 
-  defp touch_changeset(changeset) do
-    updated_at =
-      NaiveDateTime.utc_now()
-      |> NaiveDateTime.truncate(:second)
-
-    Ecto.Changeset.put_change(changeset, :updated_at, updated_at)
-  end
-
-  defp maybe_reinject_internal_fields(%{data: %{} = old_data}, new_data) do
-    has_history? = fn
-      %{"formerRepresentations" => %{"orderedItems" => list}} when is_list(list) -> true
-      _ -> false
-    end
-
-    internal_fields = Map.take(old_data, Pleroma.Constants.object_internal_fields())
-
-    remote_history_exists? = has_history?.(new_data)
-
-    # If the remote history exists, we treat that as the only source of truth.
-    new_data =
-      if has_history?.(old_data) and not remote_history_exists? do
-        Map.put(new_data, "formerRepresentations", old_data["formerRepresentations"])
-      else
-        new_data
-      end
-
-    # If the remote does not have history information, we need to manage it ourselves
-    new_data =
-      if not remote_history_exists? do
-        changed? =
-          Pleroma.Constants.status_updatable_fields()
-          |> Enum.any?(fn field -> Map.get(old_data, field) != Map.get(new_data, field) end)
-
-        %{updated_object: updated_object} =
-          new_data
-          |> Object.Updater.maybe_update_history(old_data,
-            updated: changed?,
-            use_history_in_new_object?: false
-          )
-
-        updated_object
-      else
-        new_data
-      end
-
-    Map.merge(new_data, internal_fields)
-  end
-
-  defp maybe_reinject_internal_fields(_, new_data), do: new_data
-
   @spec reinject_object(struct(), map()) :: {:ok, Object.t()} | {:error, any()}
-  defp reinject_object(%Object{data: %{"type" => "Question"}} = object, new_data) do
+  defp reinject_object(%Object{data: %{}} = object, new_data) do
     Logger.debug("Reinjecting object #{new_data["id"]}")
 
-    with data <- maybe_reinject_internal_fields(object, new_data),
+    with {:ok, new_data, _} <- ObjectValidator.validate(new_data, %{}),
-         {:ok, data, _} <- ObjectValidator.validate(data, %{}),
+         {:ok, new_data} <- MRF.filter(new_data),
-         changeset <- Object.change(object, %{data: data}),
+         {:ok, new_object, _} <-
-         changeset <- touch_changeset(changeset),
+           Object.Updater.do_update_and_invalidate_cache(
-         {:ok, object} <- Repo.insert_or_update(changeset),
+             object,
-         {:ok, object} <- Object.set_cache(object) do
+             new_data,
-      {:ok, object}
+             _touch_changeset? = true
+           ) do
+      {:ok, new_object}
     else
       e ->
         Logger.error("Error while processing object: #{inspect(e)}")
@@ -86,20 +39,11 @@ defp reinject_object(%Object{data: %{"type" => "Question"}} = object, new_data)
     end
   end
 
-  defp reinject_object(%Object{} = object, new_data) do
+  defp reinject_object(_, new_data) do
-    Logger.debug("Reinjecting object #{new_data["id"]}")
+    with {:ok, object, _} <- Pipeline.common_pipeline(new_data, local: false) do
-
-    with new_data <- Transmogrifier.fix_object(new_data),
-         data <- maybe_reinject_internal_fields(object, new_data),
-         changeset <- Object.change(object, %{data: data}),
-         changeset <- touch_changeset(changeset),
-         {:ok, object} <- Repo.insert_or_update(changeset),
-         {:ok, object} <- Object.set_cache(object) do
       {:ok, object}
     else
-      e ->
+      e -> e
-        Logger.error("Error while processing object: #{inspect(e)}")
-        {:error, e}
     end
   end
 

lib/pleroma/object/updater.ex

@@ -5,6 +5,9 @@
 defmodule Pleroma.Object.Updater do
   require Pleroma.Constants
 
+  alias Pleroma.Object
+  alias Pleroma.Repo
+
   def update_content_fields(orig_object_data, updated_object) do
     Pleroma.Constants.status_updatable_fields()
     |> Enum.reduce(
@@ -237,4 +240,50 @@ def do_with_history(object, fun) do
       {:history_items, e} -> e
     end
   end
+
+  defp maybe_touch_changeset(changeset, true) do
+    updated_at =
+      NaiveDateTime.utc_now()
+      |> NaiveDateTime.truncate(:second)
+
+    Ecto.Changeset.put_change(changeset, :updated_at, updated_at)
+  end
+
+  defp maybe_touch_changeset(changeset, _), do: changeset
+
+  def do_update_and_invalidate_cache(orig_object, updated_object, touch_changeset? \\ false) do
+    orig_object_ap_id = updated_object["id"]
+    orig_object = Object.get_by_ap_id(orig_object_ap_id)
+    orig_object_data = orig_object.data
+
+    %{
+      updated_data: updated_object_data,
+      updated: updated,
+      used_history_in_new_object?: used_history_in_new_object?
+    } = make_new_object_data_from_update_object(orig_object_data, updated_object)
+
+    changeset =
+      orig_object
+      |> Repo.preload(:hashtags)
+      |> Object.change(%{data: updated_object_data})
+      |> maybe_touch_changeset(touch_changeset?)
+
+    with {:ok, new_object} <- Repo.update(changeset),
+         {:ok, _} <- Object.invalid_object_cache(new_object),
+         {:ok, _} <- Object.set_cache(new_object),
+         # The metadata/utils.ex uses the object id for the cache.
+         {:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(new_object.id) do
+      if used_history_in_new_object? do
+        with create_activity when not is_nil(create_activity) <-
+               Pleroma.Activity.get_create_by_object_ap_id(orig_object_ap_id),
+             {:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(create_activity.id) do
+          nil
+        else
+          _ -> nil
+        end
+      end
+
+      {:ok, new_object, updated}
+    end
+  end
 end

lib/pleroma/web/activity_pub/side_effects.ex

@@ -428,31 +428,8 @@ defp handle_update_object(
       end
 
     if orig_object_data["type"] in Pleroma.Constants.updatable_object_types() do
-      %{
+      {:ok, _, updated} =
-        updated_data: updated_object_data,
+        Object.Updater.do_update_and_invalidate_cache(orig_object, updated_object)
-        updated: updated,
-        used_history_in_new_object?: used_history_in_new_object?
-      } = Object.Updater.make_new_object_data_from_update_object(orig_object_data, updated_object)
-
-      changeset =
-        orig_object
-        |> Repo.preload(:hashtags)
-        |> Object.change(%{data: updated_object_data})
-
-      with {:ok, new_object} <- Repo.update(changeset),
-           {:ok, _} <- Object.invalid_object_cache(new_object),
-           {:ok, _} <- Object.set_cache(new_object),
-           # The metadata/utils.ex uses the object id for the cache.
-           {:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(new_object.id) do
-        if used_history_in_new_object? do
-          with create_activity when not is_nil(create_activity) <-
-                 Pleroma.Activity.get_create_by_object_ap_id(orig_object_ap_id),
-               {:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(create_activity.id) do
-            nil
-          else
-            _ -> nil
-          end
-        end
 
       if updated do
         object
@@ -460,7 +437,6 @@ defp handle_update_object(
         |> ActivityPub.notify_and_stream()
       end
     end
-    end
 
     {:ok, object, meta}
   end

test/pleroma/object/fetcher_test.exs

@@ -9,8 +9,12 @@ defmodule Pleroma.Object.FetcherTest do
   alias Pleroma.Instances
   alias Pleroma.Object
   alias Pleroma.Object.Fetcher
+  alias Pleroma.Web.ActivityPub.ObjectValidator
+
+  require Pleroma.Constants
 
   import Mock
+  import Pleroma.Factory
   import Tesla.Mock
 
   setup do
@@ -284,6 +288,8 @@ test "it can refetch pruned objects" do
 
   describe "refetching" do
     setup do
+      insert(:user, ap_id: "https://mastodon.social/users/emelie")
+
       object1 = %{
         "id" => "https://mastodon.social/1",
         "actor" => "https://mastodon.social/users/emelie",
@@ -293,10 +299,14 @@ test "it can refetch pruned objects" do
         "bcc" => [],
         "bto" => [],
         "cc" => [],
-        "to" => [],
+        "to" => [Pleroma.Constants.as_public()],
-        "summary" => ""
+        "summary" => "",
+        "published" => "2023-05-08 23:43:20Z",
+        "updated" => "2023-05-09 23:43:20Z"
       }
 
+      {:ok, local_object1, _} = ObjectValidator.validate(object1, [])
+
       object2 = %{
         "id" => "https://mastodon.social/2",
         "actor" => "https://mastodon.social/users/emelie",
@@ -306,8 +316,10 @@ test "it can refetch pruned objects" do
         "bcc" => [],
         "bto" => [],
         "cc" => [],
-        "to" => [],
+        "to" => [Pleroma.Constants.as_public()],
         "summary" => "",
+        "published" => "2023-05-08 23:43:20Z",
+        "updated" => "2023-05-09 23:43:25Z",
         "formerRepresentations" => %{
           "type" => "OrderedCollection",
           "orderedItems" => [
@@ -319,14 +331,18 @@ test "it can refetch pruned objects" do
               "bcc" => [],
               "bto" => [],
               "cc" => [],
-              "to" => [],
+              "to" => [Pleroma.Constants.as_public()],
-              "summary" => ""
+              "summary" => "",
+              "published" => "2023-05-08 23:43:20Z",
+              "updated" => "2023-05-09 23:43:21Z"
             }
           ],
           "totalItems" => 1
         }
       }
 
+      {:ok, local_object2, _} = ObjectValidator.validate(object2, [])
+
       mock(fn
         %{
           method: :get,
@@ -335,7 +351,7 @@ test "it can refetch pruned objects" do
           %Tesla.Env{
             status: 200,
             headers: [{"content-type", "application/activity+json"}],
-            body: Jason.encode!(object1)
+            body: Jason.encode!(object1 |> Map.put("updated", "2023-05-09 23:44:20Z"))
           }
 
         %{
@@ -345,7 +361,7 @@ test "it can refetch pruned objects" do
           %Tesla.Env{
             status: 200,
             headers: [{"content-type", "application/activity+json"}],
-            body: Jason.encode!(object2)
+            body: Jason.encode!(object2 |> Map.put("updated", "2023-05-09 23:44:20Z"))
           }
 
         %{
@@ -370,7 +386,7 @@ test "it can refetch pruned objects" do
           apply(HttpRequestMock, :request, [env])
       end)
 
-      %{object1: object1, object2: object2}
+      %{object1: local_object1, object2: local_object2}
     end
 
     test "it keeps formerRepresentations if remote does not have this attr", %{object1: object1} do
@@ -388,8 +404,9 @@ test "it keeps formerRepresentations if remote does not have this attr", %{objec
                 "bcc" => [],
                 "bto" => [],
                 "cc" => [],
-                "to" => [],
+                "to" => [Pleroma.Constants.as_public()],
-                "summary" => ""
+                "summary" => "",
+                "published" => "2023-05-08 23:43:20Z"
               }
             ],
             "totalItems" => 1
@@ -467,6 +484,53 @@ test "it adds to formerRepresentations if the remote does not have one and the o
                }
              } = refetched.data
     end
+
+    test "it keeps the history intact if only updated time has changed",
+         %{object1: object1} do
+      full_object1 =
+        object1
+        |> Map.merge(%{
+          "updated" => "2023-05-08 23:43:47Z",
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{"type" => "Note", "content" => "mew mew 1"}
+            ],
+            "totalItems" => 1
+          }
+        })
+
+      {:ok, o} = Object.create(full_object1)
+
+      assert {:ok, refetched} = Fetcher.refetch_object(o)
+
+      assert %{
+               "content" => "test 1",
+               "formerRepresentations" => %{
+                 "orderedItems" => [
+                   %{"content" => "mew mew 1"}
+                 ],
+                 "totalItems" => 1
+               }
+             } = refetched.data
+    end
+
+    test "it goes through ObjectValidator and MRF", %{object2: object2} do
+      with_mock Pleroma.Web.ActivityPub.MRF, [:passthrough],
+        filter: fn
+          %{"type" => "Note"} = object ->
+            {:ok, Map.put(object, "content", "MRFd content")}
+
+          arg ->
+            passthrough([arg])
+        end do
+        {:ok, o} = Object.create(object2)
+
+        assert {:ok, refetched} = Fetcher.refetch_object(o)
+
+        assert %{"content" => "MRFd content"} = refetched.data
+      end
+    end
   end
 
   describe "fetch with history" do