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require 'erb'
require 'rack/request'
require 'rack/utils'
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 = @app.call(env)
headers = Utils::HeaderHash.new(headers)
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 on
# Ruby 1.9.3. 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 on
# Ruby 1.9.3. Yes, it is dumb, but I don't like Ruby yelling at me.
detail = detail = env["rack.showstatus.detail"] || message
body = @template.result(binding)
size = Rack::Utils.bytesize(body)
[status, headers.merge(CONTENT_TYPE => "text/html", CONTENT_LENGTH => size.to_s), [body]]
else
[status, headers, body]
end
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 <djangoproject.com>
# Copyright (c) 2005, the Lawrence Journal-World
# 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