1 files changed, 56 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/url_for.rb b/actionpack/lib/action_controller/metal/url_for.rb
new file mode 100644
index 0000000000..dbf7241a14
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/url_for.rb
@@ -0,0 +1,56 @@
+module ActionController
+  # Includes +url_for+ into the host class. The class has to provide a +RouteSet+ by implementing
+  # the <tt>_routes</tt> method. Otherwise, an exception will be raised.
+  #
+  # In addition to <tt>AbstractController::UrlFor</tt>, this module accesses the HTTP layer to define
+  # url options like the +host+. In order to do so, this module requires the host class
+  # to implement +env+ which needs to be Rack-compatible and +request+
+  # which is either an instance of +ActionDispatch::Request+ or an object
+  # that responds to the +host+, +optional_port+, +protocol+ and
+  # +symbolized_path_parameter+ methods.
+  #
+  #   class RootUrl
+  #     include ActionController::UrlFor
+  #     include Rails.application.routes.url_helpers
+  #
+  #     delegate :env, :request, to: :controller
+  #
+  #     def initialize(controller)
+  #       @controller = controller
+  #       @url        = root_path # named route from the application.
+  #     end
+  #   end
+  module UrlFor
+    extend ActiveSupport::Concern
+
+    include AbstractController::UrlFor
+
+    def url_options
+      @_url_options ||= {
+        :host => request.host,
+        :port => request.optional_port,
+        :protocol => request.protocol,
+        :_recall => request.path_parameters
+      }.merge!(super).freeze
+
+      if (same_origin = _routes.equal?(request.routes)) ||
+         (script_name = request.engine_script_name(_routes)) ||
+         (original_script_name = request.original_script_name)
+
+        options = @_url_options.dup
+        if original_script_name
+          options[:original_script_name] = original_script_name
+        else
+          if same_origin
+            options[:script_name] = request.script_name.empty? ? "".freeze : request.script_name.dup
+          else
+            options[:script_name] = script_name
+          end
+        end
+        options.freeze
+      else
+        @_url_options
+      end
+    end
+  end
+end