require 'action_dispatch/http/request' require 'action_dispatch/middleware/exception_wrapper' require 'active_support/deprecation' module ActionDispatch # This middleware rescues any exception returned by the application # and calls an exceptions app that will wrap it in a format for the end user. # # The exceptions app should be passed as parameter on initialization # of ShowExceptions. Everytime there is an exception, ShowExceptions will # store the exception in env["action_dispatch.exception"], rewrite the # PATH_INFO to the exception status code and call the rack app. # # If the application returns a "X-Cascade" pass response, this middleware # will send an empty response as result with the correct status code. # If any exception happens inside the exceptions app, this middleware # catches the exceptions and returns a FAILSAFE_RESPONSE. class ShowExceptions FAILSAFE_RESPONSE = [500, {'Content-Type' => 'text/html'}, ["

500 Internal Server Error

" << "If you are the administrator of this website, then please read this web " << "application's log file and/or the web server's log file to find out what " << "went wrong."]] class << self def rescue_responses ActiveSupport::Deprecation.warn "ActionDispatch::ShowExceptions.rescue_responses is deprecated. " \ "Please configure your exceptions using a railtie or in your application config instead." ExceptionWrapper.rescue_responses end def rescue_templates ActiveSupport::Deprecation.warn "ActionDispatch::ShowExceptions.rescue_templates is deprecated. " \ "Please configure your exceptions using a railtie or in your application config instead." ExceptionWrapper.rescue_templates end end def initialize(app, exceptions_app = nil) if [true, false].include?(exceptions_app) ActiveSupport::Deprecation.warn "Passing consider_all_requests_local option to ActionDispatch::ShowExceptions middleware no longer works" exceptions_app = nil end if exceptions_app.nil? raise ArgumentError, "You need to pass an exceptions_app when initializing ActionDispatch::ShowExceptions. " \ "In case you want to render pages from a public path, you can use ActionDispatch::PublicExceptions.new('path/to/public')" end @app = app @exceptions_app = exceptions_app end def call(env) begin response = @app.call(env) rescue Exception => exception raise exception if env['action_dispatch.show_exceptions'] == false end response || render_exception(env, exception) end private # Define this method because some plugins were monkey patching it. # Remove this after 3.2 is out with the other deprecations in this class. def status_code(*) end def render_exception(env, exception) wrapper = ExceptionWrapper.new(env, exception) status = wrapper.status_code env["action_dispatch.exception"] = wrapper.exception env["PATH_INFO"] = "/#{status}" response = @exceptions_app.call(env) response[1]['X-Cascade'] == 'pass' ? pass_response(status) : response rescue Exception => failsafe_error $stderr.puts "Error during failsafe response: #{failsafe_error}\n #{failsafe_error.backtrace * "\n "}" FAILSAFE_RESPONSE end def pass_response(status) [status, {"Content-Type" => "text/html; charset=#{Response.default_charset}", "Content-Length" => "0"}, []] end end end