common api: move context functions from twitterapi

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -5,7 +5,6 @@
 defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
   alias Pleroma.Activity
   alias Pleroma.Mailer
-  alias Pleroma.Object
   alias Pleroma.Repo
   alias Pleroma.User
   alias Pleroma.UserEmail
@@ -282,35 +281,6 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
     _activities = Repo.all(q)
   end
 
-  # DEPRECATED mostly, context objects are now created at insertion time.
-  def context_to_conversation_id(context) do
-    with %Object{id: id} <- Object.get_cached_by_ap_id(context) do
-      id
-    else
-      _e ->
-        changeset = Object.context_mapping(context)
-
-        case Repo.insert(changeset) do
-          {:ok, %{id: id}} ->
-            id
-
-          # This should be solved by an upsert, but it seems ecto
-          # has problems accessing the constraint inside the jsonb.
-          {:error, _} ->
-            Object.get_cached_by_ap_id(context).id
-        end
-    end
-  end
-
-  def conversation_id_to_context(id) do
-    with %Object{data: %{"id" => context}} <- Repo.get(Object, id) do
-      context
-    else
-      _e ->
-        {:error, "No such conversation"}
-    end
-  end
-
   def get_external_profile(for_user, uri) do
     with %User{} = user <- User.get_or_fetch(uri) do
       {:ok, UserView.render("show.json", %{user: user, for: for_user})}