1 files changed, 134 insertions, 5 deletions

diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex
index 699d5162f..91cfa2194 100644
--- a/lib/pleroma/web/activity_pub/utils.ex
+++ b/lib/pleroma/web/activity_pub/utils.ex
@@ -12,6 +12,7 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   alias Pleroma.User
   alias Pleroma.Web
   alias Pleroma.Web.ActivityPub.Visibility
+  alias Pleroma.Web.AdminAPI.AccountView
   alias Pleroma.Web.Endpoint
   alias Pleroma.Web.Router.Helpers
 
@@ -21,6 +22,7 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   require Pleroma.Constants
 
   @supported_object_types ["Article", "Note", "Video", "Page", "Question", "Answer", "Audio"]
+  @strip_status_report_states ~w(closed resolved)
   @supported_report_states ~w(open closed resolved)
   @valid_visibilities ~w(public unlisted private direct)
 
@@ -253,6 +255,16 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> Repo.one()
   end
 
+  @doc """
+  Returns like activities targeting an object
+  """
+  def get_object_likes(%{data: %{"id" => id}}) do
+    id
+    |> Activity.Queries.by_object_id()
+    |> Activity.Queries.by_type("Like")
+    |> Repo.all()
+  end
+
   @spec make_like_data(User.t(), map(), String.t()) :: map()
   def make_like_data(
         %User{ap_id: ap_id} = actor,
@@ -284,13 +296,30 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> maybe_put("id", activity_id)
   end
 
+  def make_emoji_reaction_data(user, object, emoji, activity_id) do
+    make_like_data(user, object, activity_id)
+    |> Map.put("type", "EmojiReaction")
+    |> Map.put("content", emoji)
+  end
+
   @spec update_element_in_object(String.t(), list(any), Object.t()) ::
           {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
   def update_element_in_object(property, element, object) do
+    length =
+      if is_map(element) do
+        element
+        |> Map.values()
+        |> List.flatten()
+        |> length()
+      else
+        element
+        |> length()
+      end
+
     data =
       Map.merge(
         object.data,
-        %{"#{property}_count" => length(element), "#{property}s" => element}
+        %{"#{property}_count" => length, "#{property}s" => element}
       )
 
     object
@@ -298,6 +327,38 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> Object.update_and_set_cache()
   end
 
+  @spec add_emoji_reaction_to_object(Activity.t(), Object.t()) ::
+          {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
+
+  def add_emoji_reaction_to_object(
+        %Activity{data: %{"content" => emoji, "actor" => actor}},
+        object
+      ) do
+    reactions = object.data["reactions"] || %{}
+    emoji_actors = reactions[emoji] || []
+    new_emoji_actors = [actor | emoji_actors] |> Enum.uniq()
+    new_reactions = Map.put(reactions, emoji, new_emoji_actors)
+    update_element_in_object("reaction", new_reactions, object)
+  end
+
+  def remove_emoji_reaction_from_object(
+        %Activity{data: %{"content" => emoji, "actor" => actor}},
+        object
+      ) do
+    reactions = object.data["reactions"] || %{}
+    emoji_actors = reactions[emoji] || []
+    new_emoji_actors = List.delete(emoji_actors, actor)
+
+    new_reactions =
+      if new_emoji_actors == [] do
+        Map.delete(reactions, emoji)
+      else
+        Map.put(reactions, emoji, new_emoji_actors)
+      end
+
+    update_element_in_object("reaction", new_reactions, object)
+  end
+
   @spec add_like_to_object(Activity.t(), Object.t()) ::
           {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
   def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
@@ -395,6 +456,19 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> Repo.one()
   end
 
+  def get_latest_reaction(internal_activity_id, %{ap_id: ap_id}, emoji) do
+    %{data: %{"object" => object_ap_id}} = Activity.get_by_id(internal_activity_id)
+
+    "EmojiReaction"
+    |> Activity.Queries.by_type()
+    |> where(actor: ^ap_id)
+    |> where([activity], fragment("?->>'content' = ?", activity.data, ^emoji))
+    |> Activity.Queries.by_object_id(object_ap_id)
+    |> order_by([activity], fragment("? desc nulls last", activity.id))
+    |> limit(1)
+    |> Repo.one()
+  end
+
   #### Announce-related helpers
 
   @doc """
@@ -487,6 +561,25 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> maybe_put("id", activity_id)
   end
 
+  def make_undo_data(
+        %User{ap_id: actor, follower_address: follower_address},
+        %Activity{
+          data: %{"id" => undone_activity_id, "context" => context},
+          actor: undone_activity_actor
+        },
+        activity_id \\ nil
+      ) do
+    %{
+      "type" => "Undo",
+      "actor" => actor,
+      "object" => undone_activity_id,
+      "to" => [follower_address, undone_activity_actor],
+      "cc" => [Pleroma.Constants.as_public()],
+      "context" => context
+    }
+    |> maybe_put("id", activity_id)
+  end
+
   @spec add_announce_to_object(Activity.t(), Object.t()) ::
           {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
   def add_announce_to_object(
@@ -614,10 +707,24 @@ defmodule Pleroma.Web.ActivityPub.Utils do
 
   defp build_flag_object(%{account: account, statuses: statuses} = _) do
     [account.ap_id] ++
-      Enum.map(statuses || [], fn
-        %Activity{} = act -> act.data["id"]
-        act when is_map(act) -> act["id"]
-        act when is_binary(act) -> act
+      Enum.map(statuses || [], fn act ->
+        id =
+          case act do
+            %Activity{} = act -> act.data["id"]
+            act when is_map(act) -> act["id"]
+            act when is_binary(act) -> act
+          end
+
+        activity = Activity.get_by_ap_id_with_object(id)
+        actor = User.get_by_ap_id(activity.object.data["actor"])
+
+        %{
+          "type" => "Note",
+          "id" => activity.data["id"],
+          "content" => activity.object.data["content"],
+          "published" => activity.object.data["published"],
+          "actor" => AccountView.render("show.json", %{user: actor})
+        }
       end)
   end
 
@@ -664,6 +771,20 @@ defmodule Pleroma.Web.ActivityPub.Utils do
 
   #### Report-related helpers
 
+  def update_report_state(%Activity{} = activity, state)
+      when state in @strip_status_report_states do
+    {:ok, stripped_activity} = strip_report_status_data(activity)
+
+    new_data =
+      activity.data
+      |> Map.put("state", state)
+      |> Map.put("object", stripped_activity.data["object"])
+
+    activity
+    |> Changeset.change(data: new_data)
+    |> Repo.update()
+  end
+
   def update_report_state(%Activity{} = activity, state) when state in @supported_report_states do
     new_data = Map.put(activity.data, "state", state)
 
@@ -674,6 +795,14 @@ defmodule Pleroma.Web.ActivityPub.Utils do
 
   def update_report_state(_, _), do: {:error, "Unsupported state"}
 
+  def strip_report_status_data(activity) do
+    [actor | reported_activities] = activity.data["object"]
+    stripped_activities = Enum.map(reported_activities, & &1["id"])
+    new_data = put_in(activity.data, ["object"], [actor | stripped_activities])
+
+    {:ok, %{activity | data: new_data}}
+  end
+
   def update_activity_visibility(activity, visibility) when visibility in @valid_visibilities do
     [to, cc, recipients] =
       activity