lib/pleroma/notification.ex

@@ -384,7 +384,7 @@ def create_notifications(%Activity{data: %{"to" => _, "type" => "Create"}} = act
   end
 
   def create_notifications(%Activity{data: %{"type" => type}} = activity, options)
-      when type in ["Follow", "Like", "Announce", "Move", "EmojiReact", "Flag"] do
+      when type in ["Follow", "Like", "Announce", "Move", "EmojiReact", "Flag", "Update"] do
     do_create_notifications(activity, options)
   end
 
@@ -438,6 +438,9 @@ defp type_from_activity(%{data: %{"type" => type}} = activity) do
         activity
         |> type_from_activity_object()
 
+      "Update" ->
+        "update"
+
       t ->
         raise "No notification type for activity type #{t}"
     end
@@ -503,7 +506,7 @@ def create_poll_notifications(%Activity{} = activity) do
   def get_notified_from_activity(activity, local_only \\ true)
 
   def get_notified_from_activity(%Activity{data: %{"type" => type}} = activity, local_only)
-      when type in ["Create", "Like", "Announce", "Follow", "Move", "EmojiReact", "Flag"] do
+      when type in ["Create", "Like", "Announce", "Follow", "Move", "EmojiReact", "Flag", "Update"] do
     potential_receiver_ap_ids = get_potential_receiver_ap_ids(activity)
 
     potential_receivers =
@@ -543,6 +546,21 @@ def get_potential_receiver_ap_ids(%{data: %{"type" => "Flag", "actor" => actor}}
     (User.all_superusers() |> Enum.map(fn user -> user.ap_id end)) -- [actor]
   end
 
+  # Update activity: notify all who repeated this
+  def get_potential_receiver_ap_ids(%{data: %{"type" => "Update", "actor" => actor}} = activity) do
+    with %Object{data: %{"id" => object_id}} <- Object.normalize(activity, fetch: false) do
+      repeaters =
+        Activity.Queries.by_type("Announce")
+        |> Activity.Queries.by_object_id(object_id)
+        |> Activity.with_joined_user_actor()
+        |> where([a, u], u.local)
+        |> select([a, u], u.ap_id)
+        |> Repo.all()
+
+      repeaters -- [actor]
+    end
+  end
+
   def get_potential_receiver_ap_ids(activity) do
     []
     |> Utils.maybe_notify_to_recipients(activity)

priv/repo/migrations/20220605185734_add_update_to_notifications_enum.exs

@@ -0,0 +1,51 @@
+defmodule Pleroma.Repo.Migrations.AddUpdateToNotificationsEnum do
+  use Ecto.Migration
+
+  @disable_ddl_transaction true
+
+  def up do
+    """
+    alter type notification_type add value 'update'
+    """
+    |> execute()
+  end
+
+  # 20210717000000_add_poll_to_notifications_enum.exs
+  def down do
+    alter table(:notifications) do
+      modify(:type, :string)
+    end
+
+    """
+    delete from notifications where type = 'update'
+    """
+    |> execute()
+
+    """
+    drop type if exists notification_type
+    """
+    |> execute()
+
+    """
+    create type notification_type as enum (
+      'follow',
+      'follow_request',
+      'mention',
+      'move',
+      'pleroma:emoji_reaction',
+      'pleroma:chat_mention',
+      'reblog',
+      'favourite',
+      'pleroma:report',
+      'poll'
+    )
+    """
+    |> execute()
+
+    """
+    alter table notifications
+    alter column type type notification_type using (type::notification_type)
+    """
+    |> execute()
+  end
+end

test/pleroma/notification_test.exs

@@ -127,6 +127,28 @@ test "does not create a notification for subscribed users if status is a reply"
       subscriber_notifications = Notification.for_user(subscriber)
       assert Enum.empty?(subscriber_notifications)
     end
+
+    test "it sends edited notifications to those who repeated a status" do
+      user = insert(:user)
+      repeated_user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, activity_one} =
+        CommonAPI.post(user, %{
+          status: "hey @#{other_user.nickname}!"
+        })
+
+      {:ok, _activity_two} = CommonAPI.repeat(activity_one.id, repeated_user)
+
+      {:ok, _edit_activity} =
+        CommonAPI.update(user, activity_one, %{
+          status: "hey @#{other_user.nickname}! mew mew"
+        })
+
+      assert [%{type: "reblog"}] = Notification.for_user(user)
+      assert [%{type: "update"}] = Notification.for_user(repeated_user)
+      assert [%{type: "mention"}] = Notification.for_user(other_user)
+    end
   end
 
   test "create_poll_notifications/1" do
@@ -839,6 +861,30 @@ test "it returns following domain-blocking recipient in enabled recipients list"
       assert [other_user] == enabled_receivers
       assert [] == disabled_receivers
     end
+
+    test "it sends edited notifications to those who repeated a status" do
+      user = insert(:user)
+      repeated_user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, activity_one} =
+        CommonAPI.post(user, %{
+          status: "hey @#{other_user.nickname}!"
+        })
+
+      {:ok, _activity_two} = CommonAPI.repeat(activity_one.id, repeated_user)
+
+      {:ok, edit_activity} =
+        CommonAPI.update(user, activity_one, %{
+          status: "hey @#{other_user.nickname}! mew mew"
+        })
+
+      {enabled_receivers, _disabled_receivers} =
+        Notification.get_notified_from_activity(edit_activity)
+
+      assert repeated_user in enabled_receivers
+      assert other_user not in enabled_receivers
+    end
   end
 
   describe "notification lifecycle" do