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require 'action_controller/metal/exceptions'
require 'active_support/core_ext/module/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::UnknownHttpMethod' => :method_not_allowed,
'ActionController::NotImplemented' => :not_implemented,
'ActionController::UnknownFormat' => :not_acceptable,
'ActionController::InvalidAuthenticityToken' => :unprocessable_entity,
'ActionDispatch::ParamsParser::ParseError' => :bad_request,
'ActionController::BadRequest' => :bad_request,
'ActionController::ParameterMissing' => :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)
expand_backtrace if exception.is_a?(SyntaxError) || exception.try(:original_exception).try(: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 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.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 expand_backtrace
@exception.backtrace.unshift(
@exception.to_s.split("\n")
).flatten!
end
end
end
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