fix rails 5 deprecations

lib/turbolinks.rb

@@ -11,8 +11,13 @@ class Engine < ::Rails::Engine
       ActiveSupport.on_load(:action_controller) do
         ActionController::Base.class_eval do
           include XHRHeaders, Cookies, XDomainBlocker, Redirection
-          before_filter :set_xhr_redirected_to, :set_request_method_cookie
-          after_filter :abort_xdomain_redirect
+          if respond_to?(:before_action)
+            before_action :set_xhr_redirected_to, :set_request_method_cookie
+            after_action :abort_xdomain_redirect
+          else
+            before_filter :set_xhr_redirected_to, :set_request_method_cookie
+            after_filter :abort_xdomain_redirect
+          end
         end
 
         ActionDispatch::Request.class_eval do
@@ -25,7 +30,11 @@ def referer
 
       ActiveSupport.on_load(:action_view) do
         (ActionView::RoutingUrlFor rescue ActionView::Helpers::UrlHelper).module_eval do
-          include XHRUrlFor
+          if defined?(prepend) && Rails.version >= '4'
+            prepend XHRUrlFor
+          else
+            include LegacyXHRUrlFor
+          end
         end
       end unless RUBY_VERSION =~ /^1\.8/
     end

lib/turbolinks/redirection.rb

@@ -3,13 +3,13 @@ module Turbolinks
   # will respond with a JavaScript call to Turbolinks.visit(url).
   module Redirection
     extend ActiveSupport::Concern
-    
+
     def redirect_via_turbolinks_to(url = {}, response_status = {})
       redirect_to(url, response_status)
 
       self.status           = 200
       self.response_body    = "Turbolinks.visit('#{location}');"
-      response.content_type = Mime::JS
+      response.content_type = Mime[:js]
     end
   end
-end
+end

lib/turbolinks/xhr_url_for.rb

@@ -1,15 +1,22 @@
 module Turbolinks
-  # Corrects the behavior of url_for (and link_to, which uses url_for) with the :back 
-  # option by using the X-XHR-Referer request header instead of the standard Referer 
+  # Corrects the behavior of url_for (and link_to, which uses url_for) with the :back
+  # option by using the X-XHR-Referer request header instead of the standard Referer
   # request header.
-  module XHRUrlFor
+  module LegacyXHRUrlFor
     def self.included(base)
       base.alias_method_chain :url_for, :xhr_referer
     end
- 
+
     def url_for_with_xhr_referer(options = {})
       options = (controller.request.headers["X-XHR-Referer"] || options) if options == :back
       url_for_without_xhr_referer options
     end
   end
+
+  module XHRUrlFor
+    def url_for(options = {})
+      options = (controller.request.headers["X-XHR-Referer"] || options) if options == :back
+      super options
+    end
+  end
 end