# frozen_string_literal: true require 'rack/show_exceptions' module Sinatra # Sinatra::ShowExceptions catches all exceptions raised from the app it # wraps. It shows a useful backtrace with the sourcefile and clickable # context, the whole Rack environment and the request data. # # Be careful when you use this on public-facing sites as it could reveal # information helpful to attackers. class ShowExceptions < Rack::ShowExceptions @@eats_errors = Object.new def @@eats_errors.flush(*) end def @@eats_errors.puts(*) end def initialize(app) @app = app end def call(env) @app.call(env) rescue Exception => e errors, env["rack.errors"] = env["rack.errors"], @@eats_errors if prefers_plain_text?(env) content_type = "text/plain" body = dump_exception(e) else content_type = "text/html" body = pretty(env, e) end env["rack.errors"] = errors [ 500, { "Content-Type" => content_type, "Content-Length" => body.bytesize.to_s }, [body] ] end # Pulled from Rack::ShowExceptions in order to override TEMPLATE. # If Rack provides another way to override, this could be removed # in the future. def pretty(env, exception) req = Rack::Request.new(env) # This double assignment is to prevent an "unused variable" warning on # Ruby 1.9.3. Yes, it is dumb, but I don't like Ruby yelling at me. path = path = (req.script_name + req.path_info).squeeze("/") # This double assignment is to prevent an "unused variable" warning on # Ruby 1.9.3. Yes, it is dumb, but I don't like Ruby yelling at me. frames = frames = exception.backtrace.map { |line| frame = OpenStruct.new if line =~ /(.*?):(\d+)(:in `(.*)')?/ frame.filename = $1 frame.lineno = $2.to_i frame.function = $4 begin lineno = frame.lineno-1 lines = ::File.readlines(frame.filename) frame.pre_context_lineno = [lineno-CONTEXT, 0].max frame.pre_context = lines[frame.pre_context_lineno...lineno] frame.context_line = lines[lineno].chomp frame.post_context_lineno = [lineno+CONTEXT, lines.size].min frame.post_context = lines[lineno+1..frame.post_context_lineno] rescue end frame else nil end }.compact TEMPLATE.result(binding) end private def bad_request?(e) Sinatra::BadRequest === e end def prefers_plain_text?(env) !(Request.new(env).preferred_type("text/plain","text/html") == "text/html") && [/curl/].index { |item| item =~ env["HTTP_USER_AGENT"] } end def frame_class(frame) if frame.filename =~ %r{lib/sinatra.*\.rb} "framework" elsif (defined?(Gem) && frame.filename.include?(Gem.dir)) || frame.filename =~ %r{/bin/(\w+)\z} "system" else "app" end end TEMPLATE = ERB.new <<-HTML # :nodoc: <%=h exception.class %> at <%=h path %>

BACKTRACE

(expand)

<% unless bad_request?(exception) %>

GET

<% if req.GET and not req.GET.empty? %> <% req.GET.sort_by { |k, v| k.to_s }.each { |key, val| %> <% } %>
Variable Value
<%=h key %>
<%=h val.inspect %>
<% else %>

No GET data.

<% end %>

POST

<% if req.POST and not req.POST.empty? %> <% req.POST.sort_by { |k, v| k.to_s }.each { |key, val| %> <% } %>
Variable Value
<%=h key %>
<%=h val.inspect %>
<% else %>

No POST data.

<% end %>
<% end %>
<% unless req.cookies.empty? %> <% req.cookies.each { |key, val| %> <% } %>
Variable Value
<%=h key %>
<%=h val.inspect %>
<% else %>

No cookie data.

<% end %>

Rack ENV

<% env.sort_by { |k, v| k.to_s }.each { |key, val| %> <% } %>
Variable Value
<%=h key %>
<%=h val %>

You're seeing this error because you have enabled the show_exceptions setting.

HTML end end