Implement /api/v1/instance/translation_languages

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

lib/pleroma/language/translation.ex

@@ -63,6 +63,32 @@ defmodule Pleroma.Language.Translation do
     end
   end
 
+  def languages_matrix do
+    provider = get_provider()
+
+    cache_key = "languages_matrix/#{provider.name()}"
+
+    case @cachex.get(:translations_cache, cache_key) do
+      {:ok, nil} ->
+        result =
+          if !configured?() do
+            {:error, :not_found}
+          else
+            provider.languages_matrix()
+          end
+
+        store_result(result, cache_key)
+
+        result
+
+      {:ok, result} ->
+        {:ok, result}
+
+      {:error, error} ->
+        {:error, error}
+    end
+  end
+
   defp get_provider, do: Pleroma.Config.get([__MODULE__, :provider])
 
   defp get_cache_key(text, source_language, target_language) do

lib/pleroma/language/translation/deepl.ex

@@ -97,6 +97,17 @@ defmodule Pleroma.Language.Translation.Deepl do
     end
   end
 
+  @impl Provider
+  def languages_matrix do
+    with {:ok, source_languages} <- supported_languages(:source),
+         {:ok, target_languages} <- supported_languages(:target) do
+      {:ok,
+       Map.new(source_languages, fn language -> {language, target_languages -- [language]} end)}
+    else
+      {:error, error} -> {:error, error}
+    end
+  end
+
   @impl Provider
   def name, do: @name
 

lib/pleroma/language/translation/libretranslate.ex

@@ -67,6 +67,17 @@ defmodule Pleroma.Language.Translation.Libretranslate do
     end
   end
 
+  @impl Provider
+  def languages_matrix do
+    with {:ok, source_languages} <- supported_languages(:source),
+         {:ok, target_languages} <- supported_languages(:target) do
+      {:ok,
+       Map.new(source_languages, fn language -> {language, target_languages -- [language]} end)}
+    else
+      {:error, error} -> {:error, error}
+    end
+  end
+
   @impl Provider
   def name, do: @name
 

lib/pleroma/language/translation/provider.ex

@@ -21,5 +21,7 @@ defmodule Pleroma.Language.Translation.Provider do
   @callback supported_languages(type :: :string | :target) ::
               {:ok, [String.t()]} | {:error, atom()}
 
+  @callback languages_matrix() :: {:ok, Map.t()} | {:error, atom()}
+
   @callback name() :: String.t()
 end