Merge branch 'translate-posts' into 'develop'

Support translation providers (DeepL, LibreTranslate)

See merge request pleroma/pleroma!4102

test/support/http_request_mock.ex

@@ -1706,6 +1706,24 @@ defmodule HttpRequestMock do
      }}
   end
 
+  def post("https://api-free.deepl.com/v2/translate" <> _, _, _, _) do
+    {:ok,
+     %Tesla.Env{
+       status: 200,
+       body: File.read!("test/fixtures/tesla_mock/deepl-translation.json"),
+       headers: [{"content-type", "application/json"}]
+     }}
+  end
+
+  def post("https://api-free.deepl.com/v2/languages" <> _, _, _, _) do
+    {:ok,
+     %Tesla.Env{
+       status: 200,
+       body: File.read!("test/fixtures/tesla_mock/deepl-languages-list.json"),
+       headers: [{"content-type", "application/json"}]
+     }}
+  end
+
   def post(url, query, body, headers) do
     {:error,
      "Mock response not implemented for POST #{inspect(url)}, #{query}, #{inspect(body)}, #{inspect(headers)}"}

test/support/translation_mock.ex

@@ -0,0 +1,43 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule TranslationMock do
+  alias Pleroma.Language.Translation.Provider
+
+  use Provider
+
+  @behaviour Provider
+
+  @name "TranslationMock"
+
+  @impl Provider
+  def configured?, do: true
+
+  @impl Provider
+  def translate(content, source_language, _target_language) do
+    {:ok,
+     %{
+       content: content |> String.reverse(),
+       detected_source_language: source_language,
+       provider: @name
+     }}
+  end
+
+  @impl Provider
+  def supported_languages(_) do
+    {:ok, ["en", "pl"]}
+  end
+
+  @impl Provider
+  def languages_matrix do
+    {:ok,
+     %{
+       "en" => ["pl"],
+       "pl" => ["en"]
+     }}
+  end
+
+  @impl Provider
+  def name, do: @name
+end