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require 'action_controller/metal/exceptions'
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::Utils::ParameterTypeError' => :bad_request,
'Rack::Utils::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
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