class ActionDispatch::ParamsParser

def call(env)
  if params = parse_formatted_parameters(env)
    env["action_dispatch.request.request_parameters"] = params
  end
  @app.call(env)
end

def initialize(app, parsers = {})
  @app, @parsers = app, DEFAULT_PARSERS.merge(parsers)
end

def logger(env)
  env['action_dispatch.logger'] || ActiveSupport::Logger.new($stderr)
end

def parse_formatted_parameters(env)
  request = Request.new(env)
  return false if request.content_length.zero?
  strategy = @parsers[request.content_mime_type]
  return false unless strategy
  case strategy
  when Proc
    strategy.call(request.raw_post)
  when :json
    data = ActiveSupport::JSON.decode(request.raw_post)
    data = {:_json => data} unless data.is_a?(Hash)
    Request::Utils.deep_munge(data).with_indifferent_access
  else
    false
  end
rescue Exception => e # JSON or Ruby code block errors
  logger(env).debug "Error occurred while parsing request parameters.\nContents:\n\n#{request.raw_post}"
  raise ParseError.new(e.message, e)
end