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mastodon/app/controllers/concerns/localized.rb

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# frozen_string_literal: true
module Localized
extend ActiveSupport::Concern
included do
around_action :set_locale
end
def set_locale(&block)
I18n.with_locale(requested_locale || I18n.default_locale, &block)
end
private
def requested_locale
requested_locale_name = available_locale_or_nil(params[:locale])
requested_locale_name ||= available_locale_or_nil(current_user.locale) if respond_to?(:user_signed_in?) && user_signed_in?
requested_locale_name ||= http_accept_language if ENV['DEFAULT_LOCALE'].blank?
requested_locale_name
end
def http_accept_language
HttpAcceptLanguage::Parser.new(request.headers.fetch('Accept-Language')).language_region_compatible_from(I18n.available_locales) if request.headers.key?('Accept-Language')
end
def available_locale_or_nil(locale_name)
locale_name.to_sym if locale_name.present? && I18n.available_locales.include?(locale_name.to_sym)
end
end