require 'action_controller/metal/exceptions' require 'active_support/core_ext/class/attribute_accessors' module ActionDispatch class ExceptionWrapper cattr_accessor :rescue_responses @@rescue_responses = Hash.new(:internal_server_error) @@rescue_responses.merge!( 'ActionController::RoutingError' => :not_found, 'AbstractController::ActionNotFound' => :not_found, 'ActionController::MethodNotAllowed' => :method_not_allowed, 'ActionController::NotImplemented' => :not_implemented, 'ActionController::UnknownFormat' => :not_acceptable, 'ActionController::InvalidAuthenticityToken' => :unprocessable_entity, 'ActionController::BadRequest' => :bad_request ) cattr_accessor :rescue_templates @@rescue_templates = Hash.new('diagnostics') @@rescue_templates.merge!( 'ActionView::MissingTemplate' => 'missing_template', 'ActionController::RoutingError' => 'routing_error', 'AbstractController::ActionNotFound' => 'unknown_action', 'ActionView::Template::Error' => 'template_error' ) attr_reader :env, :exception, :line_number, :file def initialize(env, exception) @env = env @exception = original_exception(exception) end def rescue_template @@rescue_templates[@exception.class.name] end def status_code self.class.status_code_for_exception(@exception.class.name) end def application_trace clean_backtrace(:silent) end def framework_trace clean_backtrace(:noise) end def full_trace clean_backtrace(:all) end def self.status_code_for_exception(class_name) Rack::Utils.status_code(@@rescue_responses[class_name]) end def source_extract if application_trace && trace = application_trace.first file, line, _ = trace.split(":") @file = file @line_number = line.to_i source_fragment(@file, @line_number) end end private def original_exception(exception) if registered_original_exception?(exception) exception.original_exception else exception end end def registered_original_exception?(exception) exception.respond_to?(:original_exception) && @@rescue_responses.has_key?(exception.original_exception.class.name) end def clean_backtrace(*args) if backtrace_cleaner backtrace_cleaner.clean(@exception.backtrace, *args) else @exception.backtrace end end def backtrace_cleaner @backtrace_cleaner ||= @env['action_dispatch.backtrace_cleaner'] end def source_fragment(path, line) return unless Rails.respond_to?(:root) && Rails.root full_path = Rails.root.join(path) if File.exists?(full_path) File.open(full_path, "r") do |file| start = [line - 3, 0].max lines = file.each_line.drop(start).take(6) Hash[*(start+1..(lines.count+start)).zip(lines).flatten] end end end end end