require "active_support/core_ext/module/attribute_accessors" require "rack/utils" module ActionDispatch class ExceptionWrapper cattr_accessor :rescue_responses, default: Hash.new(:internal_server_error).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::Http::Parameters::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, default: Hash.new("diagnostics").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