Add user content translations with configurable backends (#19218)

app/controllers/api/v1/statuses/translations_controller.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class Api::V1::Statuses::TranslationsController < Api::BaseController
+  include Authorization
+
+  before_action -> { doorkeeper_authorize! :read, :'read:statuses' }
+  before_action :set_status
+  before_action :set_translation
+
+  rescue_from TranslationService::NotConfiguredError, with: :not_found
+  rescue_from TranslationService::UnexpectedResponseError, TranslationService::QuotaExceededError, TranslationService::TooManyRequestsError, with: :service_unavailable
+
+  def create
+    render json: @translation, serializer: REST::TranslationSerializer
+  end
+
+  private
+
+  def set_status
+    @status = Status.find(params[:status_id])
+    authorize @status, :show?
+  rescue Mastodon::NotPermittedError
+    not_found
+  end
+
+  def set_translation
+    @translation = TranslateStatusService.new.call(@status, content_locale)
+  end
+end