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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
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