require "action_dispatch/http/request" require "action_dispatch/middleware/exception_wrapper" require "action_dispatch/routing/inspector" require "action_view" require "action_view/base" require "pp" module ActionDispatch # This middleware is responsible for logging exceptions and # showing a debugging page in case the request is local. class DebugExceptions RESCUES_TEMPLATE_PATH = File.expand_path("../templates", __FILE__) class DebugView < ActionView::Base def debug_params(params) clean_params = params.clone clean_params.delete("action") clean_params.delete("controller") if clean_params.empty? "None" else PP.pp(clean_params, "", 200) end end def debug_headers(headers) if headers.present? headers.inspect.gsub(",", ",\n") else "None" end end def debug_hash(object) object.to_hash.sort_by { |k, _| k.to_s }.map { |k, v| "#{k}: #{v.inspect rescue $!.message}" }.join("\n") end def render(*) if logger = ActionView::Base.logger logger.silence { super } else super end end end def initialize(app, routes_app = nil, response_format = :default) @app = app @routes_app = routes_app @response_format = response_format end def call(env) request = ActionDispatch::Request.new env _, headers, body = response = @app.call(env) if headers["X-Cascade"] == "pass" body.close if body.respond_to?(:close) raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}" end response rescue Exception => exception raise exception unless request.show_exceptions? render_exception(request, exception) end private def render_exception(request, exception) backtrace_cleaner = request.get_header("action_dispatch.backtrace_cleaner") wrapper = ExceptionWrapper.new(backtrace_cleaner, exception) log_error(request, wrapper) if request.get_header("action_dispatch.show_detailed_exceptions") content_type = request.formats.first if api_request?(content_type) render_for_api_request(content_type, wrapper) else render_for_browser_request(request, wrapper) end else raise exception end end def render_for_browser_request(request, wrapper) template = create_template(request, wrapper) file = "rescues/#{wrapper.rescue_template}" if request.xhr? body = template.render(template: file, layout: false, formats: [:text]) format = "text/plain" else body = template.render(template: file, layout: "rescues/layout") format = "text/html" end render(wrapper.status_code, body, format) end def render_for_api_request(content_type, wrapper) body = { status: wrapper.status_code, error: Rack::Utils::HTTP_STATUS_CODES.fetch( wrapper.status_code, Rack::Utils::HTTP_STATUS_CODES[500] ), exception: wrapper.exception.inspect, traces: wrapper.traces } to_format = "to_#{content_type.to_sym}" if content_type && body.respond_to?(to_format) formatted_body = body.public_send(to_format) format = content_type else formatted_body = body.to_json format = Mime[:json] end render(wrapper.status_code, formatted_body, format) end def create_template(request, wrapper) traces = wrapper.traces trace_to_show = "Application Trace" if traces[trace_to_show].empty? && wrapper.rescue_template != "routing_error" trace_to_show = "Full Trace" end if source_to_show = traces[trace_to_show].first source_to_show_id = source_to_show[:id] end DebugView.new([RESCUES_TEMPLATE_PATH], request: request, exception: wrapper.exception, traces: traces, show_source_idx: source_to_show_id, trace_to_show: trace_to_show, routes_inspector: routes_inspector(wrapper.exception), source_extracts: wrapper.source_extracts, line_number: wrapper.line_number, file: wrapper.file ) end def render(status, body, format) [status, {"Content-Type" => "#{format}; charset=#{Response.default_charset}", "Content-Length" => body.bytesize.to_s}, [body]] end def log_error(request, wrapper) logger = logger(request) return unless logger exception = wrapper.exception trace = wrapper.application_trace trace = wrapper.framework_trace if trace.empty? ActiveSupport::Deprecation.silence do logger.fatal " " logger.fatal "#{exception.class} (#{exception.message}):" log_array logger, exception.annoted_source_code if exception.respond_to?(:annoted_source_code) logger.fatal " " log_array logger, trace end end def log_array(logger, array) array.map { |line| logger.fatal line } end def logger(request) request.logger || ActionView::Base.logger || stderr_logger end def stderr_logger @stderr_logger ||= ActiveSupport::Logger.new($stderr) end def routes_inspector(exception) if @routes_app.respond_to?(:routes) && (exception.is_a?(ActionController::RoutingError) || exception.is_a?(ActionView::Template::Error)) ActionDispatch::Routing::RoutesInspector.new(@routes_app.routes.routes) end end def api_request?(content_type) @response_format == :api && !content_type.html? end end end