require 'active_support/core_ext/module/attribute_accessors' require 'rack/utils' 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::UnknownHttpMethod' => :method_not_allowed, 'ActionController::NotImplemented' => :not_implemented, 'ActionController::UnknownFormat' => :not_acceptable, 'ActionController::InvalidAuthenticityToken' => :unprocessable_entity, 'ActionController::InvalidCrossOriginRequest' => :unprocessable_entity, 'ActionDispatch::ParamsParser::ParseError' => :bad_request, 'ActionController::BadRequest' => :bad_request, 'ActionController::ParameterMissing' => :bad_request, 'Rack::QueryParser::ParameterTypeError' => :bad_request, 'Rack::QueryParser::InvalidParameterError' => :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 :backtrace_cleaner, :exception, :line_number, :file def initialize(backtrace_cleaner, exception) @backtrace_cleaner = backtrace_cleaner @exception = original_exception(exception) expand_backtrace if exception.is_a?(SyntaxError) || exception.cause.is_a?(SyntaxError) 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 traces application_trace_with_ids = [] framework_trace_with_ids = [] full_trace_with_ids = [] full_trace.each_with_index do |trace, idx| trace_with_id = { id: idx, trace: trace } if application_trace.include?(trace) application_trace_with_ids << trace_with_id else framework_trace_with_ids << trace_with_id end full_trace_with_ids << trace_with_id end { "Application Trace" => application_trace_with_ids, "Framework Trace" => framework_trace_with_ids, "Full Trace" => full_trace_with_ids } end def self.status_code_for_exception(class_name) Rack::Utils.status_code(@@rescue_responses[class_name]) end def source_extracts backtrace.map do |trace| file, line_number = extract_file_and_line_number(trace) { code: source_fragment(file, line_number), line_number: line_number } end end private def backtrace Array(@exception.backtrace) end def original_exception(exception) if @@rescue_responses.has_key?(exception.cause.class.name) exception.cause else exception end end def clean_backtrace(*args) if backtrace_cleaner backtrace_cleaner.clean(backtrace, *args) else backtrace end end def source_fragment(path, line) return unless Rails.respond_to?(:root) && Rails.root full_path = Rails.root.join(path) if File.exist?(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 def extract_file_and_line_number(trace) # Split by the first colon followed by some digits, which works for both # Windows and Unix path styles. file, line = trace.match(/^(.+?):(\d+).*$/, &:captures) || trace [file, line.to_i] end def expand_backtrace @exception.backtrace.unshift( @exception.to_s.split("\n") ).flatten! end end end