feat(federation): expose public activities as announcements in relay outbx & rfrsh profile aftr fllw

Also change ActorView to send proper HTTP error codes

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/federation/activity_pub/relay.ex

@@ -49,10 +49,17 @@ defmodule Mobilizon.Federation.ActivityPub.Relay do
     %Actor{} = local_actor = get_actor()
 
     with {:ok, target_instance} <- fetch_actor(address),
-         {:ok, %Actor{} = target_actor} <-
+         {:ok, %Actor{id: target_actor_id} = target_actor} <-
            ActivityPubActor.get_or_fetch_actor_by_url(target_instance),
          {:ok, activity, follow} <- Follows.follow(local_actor, target_actor) do
       Logger.info("Relay: followed instance #{target_instance}; id=#{activity.data["id"]}")
+
+      Background.enqueue("refresh_profile", %{
+        "actor_id" => target_actor_id
+      })
+
+      Logger.info("Relay: schedule refreshing instance #{target_instance} after follow")
+
       {:ok, activity, follow}
     else
       {:error, :person_no_follow} ->

lib/web/controllers/activity_pub_controller.ex

@@ -175,25 +175,25 @@ defmodule Mobilizon.Web.ActivityPubController do
   end
 
   def errors(conn, {:error, :not_found}) do
-    conn
-    |> put_status(404)
-    |> json("Not found")
+    send_resp(conn, 404, "Not found")
+  end
+
+  def errors(conn, {:error, :bad_request}) do
+    send_resp(conn, 400, "Bad request")
   end
 
   def errors(conn, e) do
     Logger.debug(inspect(e))
 
-    conn
-    |> put_status(500)
-    |> json("Unknown Error")
+    send_resp(conn, 500, "Unknown Error")
   end
 
   @spec actor_collection(Conn.t(), String.t(), map()) :: Conn.t()
 
   defp actor_collection(conn, collection, %{"name" => name, "page" => page}) do
-    with {page, ""} <- Integer.parse(page),
+    with {:page, {page, ""}} <- {:page, Integer.parse(page)},
          page <- max(page, 1),
-         %Actor{} = actor <- Actors.get_local_actor_by_name_with_preload(name) do
+         {:actor, %Actor{} = actor} <- {:actor, Actors.get_local_actor_by_name_with_preload(name)} do
       conn
       |> put_resp_content_type("application/activity+json")
       |> json(
@@ -203,19 +203,29 @@ defmodule Mobilizon.Web.ActivityPubController do
           actor_applicant: Map.get(conn.assigns, :actor)
         })
       )
+    else
+      {:page, _} ->
+        {:error, :bad_request}
+
+      {:actor, _} ->
+        {:error, :not_found}
     end
   end
 
   defp actor_collection(conn, collection, %{"name" => name}) do
-    with %Actor{} = actor <- Actors.get_local_actor_by_name_with_preload(name) do
-      conn
-      |> put_resp_content_type("application/activity+json")
-      |> json(
-        ActorView.render("#{collection}.json", %{
-          actor: actor,
-          actor_applicant: Map.get(conn.assigns, :actor)
-        })
-      )
+    case Actors.get_local_actor_by_name_with_preload(name) do
+      %Actor{} = actor ->
+        conn
+        |> put_resp_content_type("application/activity+json")
+        |> json(
+          ActorView.render("#{collection}.json", %{
+            actor: actor,
+            actor_applicant: Map.get(conn.assigns, :actor)
+          })
+        )
+
+      _ ->
+        {:error, :not_found}
     end
   end
 

lib/web/views/activity_pub/actor_view.ex

@@ -6,7 +6,7 @@ defmodule Mobilizon.Web.ActivityPub.ActorView do
   alias Mobilizon.Discussions.Discussion
   alias Mobilizon.Events.Event
   alias Mobilizon.Federation.ActivityPub
-  alias Mobilizon.Federation.ActivityPub.{Activity, Utils}
+  alias Mobilizon.Federation.ActivityPub.{Activity, Relay, Utils}
   alias Mobilizon.Federation.ActivityStream.Convertible
   alias Mobilizon.Posts.Post
   alias Mobilizon.Resources.Resource
@@ -124,7 +124,21 @@ defmodule Mobilizon.Web.ActivityPub.ActorView do
   end
 
   defp fetch_collection(:outbox, actor, page) do
-    ActivityPub.fetch_public_activities_for_actor(actor, page)
+    # In the specific case of the relay outbox collection we need to expose public activities as "Announce"
+    if Relay.get_actor().id == actor.id do
+      %{total: total, elements: elements} =
+        ActivityPub.fetch_public_activities_for_actor(actor, page)
+
+      %{
+        total: total,
+        elements:
+          Enum.map(elements, fn object ->
+            Utils.make_announce_data(actor, item(object), nil, true)
+          end)
+      }
+    else
+      ActivityPub.fetch_public_activities_for_actor(actor, page)
+    end
   end
 
   defp fetch_collection(_, _, _), do: @private_visibility_empty_collection
@@ -202,6 +216,7 @@ defmodule Mobilizon.Web.ActivityPub.ActorView do
   def item(%Post{} = post), do: Convertible.model_to_as(post)
   def item(%Event{} = event), do: Convertible.model_to_as(event)
   def item(%TodoList{} = todo_list), do: Convertible.model_to_as(todo_list)
+  def item(item), do: item
 
   @spec actor_applicant_group_member?(Actor.t(), Actor.t()) :: boolean()
   defp actor_applicant_group_member?(%Actor{id: group_id}, %Actor{id: actor_applicant_id}),