1 files changed, 71 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/http/parameters.rb b/actionpack/lib/action_dispatch/http/parameters.rb
new file mode 100644
index 0000000000..c9df787351
--- /dev/null
+++ b/actionpack/lib/action_dispatch/http/parameters.rb
@@ -0,0 +1,71 @@
+module ActionDispatch
+  module Http
+    module Parameters
+      PARAMETERS_KEY = 'action_dispatch.request.path_parameters'
+
+      DEFAULT_PARSERS = {
+        Mime[:json] => lambda { |raw_post|
+          data = ActiveSupport::JSON.decode(raw_post)
+          data.is_a?(Hash) ? data : {:_json => data}
+        }
+      }
+
+      def self.included(klass)
+        class << klass
+          attr_accessor :parameter_parsers
+        end
+
+        klass.parameter_parsers = DEFAULT_PARSERS
+      end
+      # Returns both GET and POST \parameters in a single hash.
+      def parameters
+        params = get_header("action_dispatch.request.parameters")
+        return params if params
+
+        params = begin
+                   request_parameters.merge(query_parameters)
+                 rescue EOFError
+                   query_parameters.dup
+                 end
+        params.merge!(path_parameters)
+        set_header("action_dispatch.request.parameters", params)
+        params
+      end
+      alias :params :parameters
+
+      def path_parameters=(parameters) #:nodoc:
+        delete_header('action_dispatch.request.parameters')
+        set_header PARAMETERS_KEY, parameters
+      end
+
+      # Returns a hash with the \parameters used to form the \path of the request.
+      # Returned hash keys are strings:
+      #
+      #   {'action' => 'my_action', 'controller' => 'my_controller'}
+      def path_parameters
+        get_header(PARAMETERS_KEY) || {}
+      end
+
+      private
+
+      def parse_formatted_parameters(parsers)
+        return yield if content_length.zero?
+
+        strategy = parsers.fetch(content_mime_type) { return yield }
+
+        begin
+          strategy.call(raw_post)
+        rescue # JSON or Ruby code block errors
+          my_logger = logger || ActiveSupport::Logger.new($stderr)
+          my_logger.debug "Error occurred while parsing request parameters.\nContents:\n\n#{raw_post}"
+
+          raise ParamsParser::ParseError
+        end
+      end
+
+      def params_parsers
+        ActionDispatch::Request.parameter_parsers
+      end
+    end
+  end
+end