ActivityPubController: Add Mastodon activity compat route.

lib/pleroma/web/activity_pub/activity_pub_controller.ex

@@ -102,8 +102,8 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubController do
     conn
   end
 
-  def activity(conn, %{"uuid" => uuid}) do
-    with ap_id <- o_status_url(conn, :activity, uuid),
+  def activity(conn, _params) do
+    with ap_id <- Endpoint.url() <> conn.request_path,
          %Activity{} = activity <- Activity.normalize(ap_id),
          {_, true} <- {:public?, Visibility.is_public?(activity)} do
       conn

lib/pleroma/web/common_api/utils.ex

@@ -468,6 +468,8 @@ defmodule Pleroma.Web.CommonAPI.Utils do
         |> Enum.map(& &1.ap_id)
 
       recipients ++ subscriber_ids
+    else
+      _e -> recipients
     end
   end
 
@@ -479,6 +481,8 @@ defmodule Pleroma.Web.CommonAPI.Utils do
       |> User.get_followers()
       |> Enum.map(& &1.ap_id)
       |> Enum.concat(recipients)
+    else
+      _e -> recipients
     end
   end
 

lib/pleroma/web/ostatus/ostatus_controller.ex

@@ -54,7 +54,7 @@ defmodule Pleroma.Web.OStatus.OStatusController do
     end
   end
 
-  def activity(%{assigns: %{format: format}} = conn, %{"uuid" => _uuid})
+  def activity(%{assigns: %{format: format}} = conn, _params)
       when format in ["json", "activity+json"] do
     ActivityPubController.call(conn, :activity)
   end

lib/pleroma/web/router.ex

@@ -556,8 +556,9 @@ defmodule Pleroma.Web.Router do
     get("/notice/:id", OStatus.OStatusController, :notice)
     get("/notice/:id/embed_player", OStatus.OStatusController, :notice_player)
 
-    # Mastodon compat routes
+    # Mastodon compatibility routes
     get("/users/:nickname/statuses/:id", OStatus.OStatusController, :object)
+    get("/users/:nickname/statuses/:id/activity", OStatus.OStatusController, :activity)
 
     get("/users/:nickname/feed", Feed.UserController, :feed, as: :user_feed)
     get("/users/:nickname", Feed.UserController, :feed_redirect, as: :user_feed)