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# frozen_string_literal: true require 'erb' require_relative 'constants' require_relative 'utils' require_relative 'request' require_relative 'body_proxy' module Rack # Rack::ShowStatus catches all empty responses and replaces them # with a site explaining the error. # # Additional details can be put into <tt>rack.showstatus.detail</tt> # and will be shown as HTML. If such details exist, the error page # is always rendered, even if the reply was not empty. class ShowStatus def initialize(app) @app = app @template = ERB.new(TEMPLATE) end def call(env) status, headers, body = response = @app.call(env) empty = headers[CONTENT_LENGTH].to_i <= 0 # client or server error, or explicit message if (status.to_i >= 400 && empty) \|\| env[RACK_SHOWSTATUS_DETAIL] # This double assignment is to prevent an "unused variable" warning. # Yes, it is dumb, but I don't like Ruby yelling at me. req = req = Rack::Request.new(env) message = Rack::Utils::HTTP_STATUS_CODES[status.to_i] \|\| status.to_s # This double assignment is to prevent an "unused variable" warning. # Yes, it is dumb, but I don't like Ruby yelling at me. detail = detail = env[RACK_SHOWSTATUS_DETAIL] \|\| message html = @template.result(binding) size = html.bytesize response[2] = Rack::BodyProxy.new([html]) do body.close if body.respond_to?(:close) end headers[CONTENT_TYPE] = "text/html" headers[CONTENT_LENGTH] = size.to_s end response end def h(obj) # :nodoc: case obj when String Utils.escape_html(obj) else Utils.escape_html(obj.inspect) end end # :stopdoc: # adapted from Django <www.djangoproject.com> # Copyright (c) Django Software Foundation and individual contributors. # Used under the modified BSD license: # http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5 TEMPLATE = <<'HTML' <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html lang="en"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title><%=h message %> at <%=h req.script_name + req.path_info %></title> <meta name="robots" content="NONE,NOARCHIVE" /> <style type="text/css"> html * { padding:0; margin:0; } body * { padding:10px 20px; } body * * { padding:0; } body { font:small sans-serif; background:#eee; } body>div { border-bottom:1px solid #ddd; } h1 { font-weight:normal; margin-bottom:.4em; } h1 span { font-size:60%; color:#666; font-weight:normal; } table { border:none; border-collapse: collapse; width:100%; } td, th { vertical-align:top; padding:2px 3px; } th { width:12em; text-align:right; color:#666; padding-right:.5em; } #info { background:#f6f6f6; } #info ol { margin: 0.5em 4em; } #info ol li { font-family: monospace; } #summary { background: #ffc; } #explanation { background:#eee; border-bottom: 0px none; } </style> </head> <body> <div id="summary"> <h1><%=h message %> <span>(<%= status.to_i %>)</span></h1> <table class="meta"> <tr> <th>Request Method:</th> <td><%=h req.request_method %></td> </tr> <tr> <th>Request URL:</th> <td><%=h req.url %></td> </tr> </table> </div> <div id="info"> <p><%=h detail %></p> </div> <div id="explanation"> <p> You're seeing this error because you use <code>Rack::ShowStatus</code>. </p> </div> </body> </html> HTML # :startdoc: end end