vendor/rails/actionpack/lib/action_controller/vendor/rack-1.0/rack/showstatus.rb

   1 require 'erb'
   2 require 'rack/request'
   3 require 'rack/utils'
   4
   5 module Rack
   6   # Rack::ShowStatus catches all empty responses the app it wraps and
   7   # replaces them with a site explaining the error.
   8   #
   9   # Additional details can be put into <tt>rack.showstatus.detail</tt>
  10   # and will be shown as HTML.  If such details exist, the error page
  11   # is always rendered, even if the reply was not empty.
  12
  13   class ShowStatus
  14     def initialize(app)
  15       @app = app
  16       @template = ERB.new(TEMPLATE)
  17     end
  18
  19     def call(env)
  20       status, headers, body = @app.call(env)
  21       headers = Utils::HeaderHash.new(headers)
  22       empty = headers['Content-Length'].to_i <= 0
  23
  24       # client or server error, or explicit message
  25       if (status.to_i >= 400 && empty) || env["rack.showstatus.detail"]
  26         req = Rack::Request.new(env)
  27         message = Rack::Utils::HTTP_STATUS_CODES[status.to_i] || status.to_s
  28         detail = env["rack.showstatus.detail"] || message
  29         body = @template.result(binding)
  30         size = Rack::Utils.bytesize(body)
  31         [status, headers.merge("Content-Type" => "text/html", "Content-Length" => size.to_s), [body]]
  32       else
  33         [status, headers, body]
  34       end
  35     end
  36
  37     def h(obj)                  # :nodoc:
  38       case obj
  39       when String
  40         Utils.escape_html(obj)
  41       else
  42         Utils.escape_html(obj.inspect)
  43       end
  44     end
  45
  46     # :stopdoc:
  47
  48 # adapted from Django <djangoproject.com>
  49 # Copyright (c) 2005, the Lawrence Journal-World
  50 # Used under the modified BSD license:
  51 # http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5
  52 TEMPLATE = <<'HTML'
  53 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  54 <html lang="en">
  55 <head>
  56   <meta http-equiv="content-type" content="text/html; charset=utf-8" />
  57   <title><%=h message %> at <%=h req.script_name + req.path_info %></title>
  58   <meta name="robots" content="NONE,NOARCHIVE" />
  59   <style type="text/css">
  60     html * { padding:0; margin:0; }
  61     body * { padding:10px 20px; }
  62     body * * { padding:0; }
  63     body { font:small sans-serif; background:#eee; }
  64     body>div { border-bottom:1px solid #ddd; }
  65     h1 { font-weight:normal; margin-bottom:.4em; }
  66     h1 span { font-size:60%; color:#666; font-weight:normal; }
  67     table { border:none; border-collapse: collapse; width:100%; }
  68     td, th { vertical-align:top; padding:2px 3px; }
  69     th { width:12em; text-align:right; color:#666; padding-right:.5em; }
  70     #info { background:#f6f6f6; }
  71     #info ol { margin: 0.5em 4em; }
  72     #info ol li { font-family: monospace; }
  73     #summary { background: #ffc; }
  74     #explanation { background:#eee; border-bottom: 0px none; }
  75   </style>
  76 </head>
  77 <body>
  78   <div id="summary">
  79     <h1><%=h message %> <span>(<%= status.to_i %>)</span></h1>
  80     <table class="meta">
  81       <tr>
  82         <th>Request Method:</th>
  83         <td><%=h req.request_method %></td>
  84       </tr>
  85       <tr>
  86         <th>Request URL:</th>
  87       <td><%=h req.url %></td>
  88       </tr>
  89     </table>
  90   </div>
  91   <div id="info">
  92     <p><%= detail %></p>
  93   </div>
  94
  95   <div id="explanation">
  96     <p>
  97     You're seeing this error because you use <code>Rack::ShowStatus</code>.
  98     </p>
  99   </div>
 100 </body>
 101 </html>
 102 HTML
 103
 104     # :startdoc:
 105   end
 106 end