Store translations in database

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

lib/pleroma/status_translation.ex

@@ -0,0 +1,65 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.StatusTranslation do
+  use Ecto.Schema
+
+  import Ecto.Changeset
+  import Ecto.Query
+
+  alias Pleroma.Language.Translation
+  alias Pleroma.Object
+  alias Pleroma.Repo
+  alias Pleroma.StatusTranslation
+
+  schema "status_translations" do
+    field(:language, :string)
+    field(:provider, :string)
+    field(:detected_source_language, :string)
+    field(:content, {:map, :string})
+
+    belongs_to(:object, Object)
+
+    timestamps()
+  end
+
+  def changeset(%StatusTranslation{} = status_translation, params \\ %{}) do
+    status_translation
+    |> cast(params, [:object_id, :language, :provider, :detected_source_language, :content])
+    |> validate_required([:object_id, :language, :content])
+    |> unique_constraint([:object_id, :language])
+  end
+
+  def get(%Object{} = object, language, fetch_unavailable \\ true) do
+    translation = Repo.get_by(StatusTranslation, object_id: object.id, language: language)
+
+    if translation or not fetch_unavailable do
+      translation
+    else
+      with {:ok,
+            %{
+              content: content,
+              detected_source_language: detected_source_language,
+              provider: provider
+            }} <-
+             Translation.translate(
+               object.data["content"],
+               object.data["language"],
+               language
+             ) do
+        %StatusTranslation{}
+        |> changeset(%{
+          object_id: object.id,
+          language: language,
+          provider: provider,
+          detected_source_language: detected_source_language,
+          content: %{
+            "content" => content
+          }
+        })
+        |> Repo.insert!()
+      end
+    end
+  end
+end

lib/pleroma/web/mastodon_api/controllers/status_controller.ex

@@ -592,13 +592,9 @@ def translate(
               Pleroma.Config.get([Pleroma.Language.Translation, :allow_remote])},
          {:language, language} when is_binary(language) <-
            {:language, Map.get(params, :target_language) || user.language},
-         {:ok, result} <-
-           Translation.translate(
-             object.data["content"],
-             object.data["language"],
-             language
-           ) do
-      render(conn, "translation.json", result)
+         %Pleroma.StatusTranslation{} = result <-
+           Pleroma.StatusTranslation.get(object, language) do
+      render(conn, "translation.json", result: result)
     else
       {:authentication, false} ->
         render_error(conn, :unauthorized, "Authorization is required to translate statuses")

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -471,7 +471,8 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
         content_type: opts[:with_source] && (object.data["content_type"] || "text/plain"),
         quotes_count: object.data["quotesCount"] || 0,
         event: build_event(object.data, opts[:for]),
-        bookmark_folder: bookmark_folder
+        bookmark_folder: bookmark_folder,
+        translation: get_translation(object, opts[:language])
       }
     }
   end
@@ -480,6 +481,18 @@ def render("show.json", _) do
     nil
   end
 
+  defp get_translation(object, language) when is_binary(language) do
+    translation = Pleroma.StatusTranslation.get(object, language)
+
+    if translation do
+      render("translation.json", %{result: translation})
+    else
+      nil
+    end
+  end
+
+  defp get_translation(_, _), do: nil
+
   def render("card.json", %{embed: %Embed{} = embed}) do
     with {:ok, %Card{} = card} <- Card.parse(embed) do
       Card.to_map(card)
@@ -691,9 +704,11 @@ def render("context.json", %{activity: activity, activities: activities, user: u
   end
 
   def render("translation.json", %{
-        content: content,
-        detected_source_language: detected_source_language,
-        provider: provider
+        result: %{
+          content: %{"content" => content},
+          detected_source_language: detected_source_language,
+          provider: provider
+        }
       }) do
     %{content: content, detected_source_language: detected_source_language, provider: provider}
   end

priv/repo/migrations/20231005232600_create_status_translations.exs

@@ -0,0 +1,21 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Repo.Migrations.CreateStatusTranslations do
+  use Ecto.Migration
+
+  def change do
+    create_if_not_exists table(:status_translations) do
+      add(:object_id, references(:objects, on_delete: :delete_all), null: false)
+      add(:language, :text, null: false)
+      add(:provider, :text)
+      add(:detected_source_language, :text)
+      add(:content, {:map, :string})
+
+      timestamps()
+    end
+
+    create_if_not_exists(unique_index(:status_translations, [:object_id, :language]))
+  end
+end