2009-02-04 21:26:08 +01:00
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require 'erb'
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require 'rack/request'
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require 'rack/utils'
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module Rack
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# Rack::ShowStatus catches all empty responses the app it wraps and
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# replaces them with a site explaining the error.
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#
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# Additional details can be put into <tt>rack.showstatus.detail</tt>
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# and will be shown as HTML. If such details exist, the error page
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# is always rendered, even if the reply was not empty.
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class ShowStatus
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def initialize(app)
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@app = app
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@template = ERB.new(TEMPLATE)
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end
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def call(env)
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status, headers, body = @app.call(env)
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headers = Utils::HeaderHash.new(headers)
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empty = headers['Content-Length'].to_i <= 0
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# client or server error, or explicit message
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if (status.to_i >= 400 && empty) || env["rack.showstatus.detail"]
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req = Rack::Request.new(env)
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message = Rack::Utils::HTTP_STATUS_CODES[status.to_i] || status.to_s
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detail = env["rack.showstatus.detail"] || message
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body = @template.result(binding)
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2009-03-16 15:55:30 +01:00
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size = Rack::Utils.bytesize(body)
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2009-02-04 21:26:08 +01:00
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[status, headers.merge("Content-Type" => "text/html", "Content-Length" => size.to_s), [body]]
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else
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[status, headers, body]
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end
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end
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def h(obj) # :nodoc:
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case obj
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when String
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Utils.escape_html(obj)
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else
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Utils.escape_html(obj.inspect)
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end
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end
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# :stopdoc:
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# adapted from Django <djangoproject.com>
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# Copyright (c) 2005, the Lawrence Journal-World
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# Used under the modified BSD license:
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# http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5
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TEMPLATE = <<'HTML'
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<title><%=h message %> at <%=h req.script_name + req.path_info %></title>
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<meta name="robots" content="NONE,NOARCHIVE" />
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<style type="text/css">
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html * { padding:0; margin:0; }
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body * { padding:10px 20px; }
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body * * { padding:0; }
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body { font:small sans-serif; background:#eee; }
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body>div { border-bottom:1px solid #ddd; }
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h1 { font-weight:normal; margin-bottom:.4em; }
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h1 span { font-size:60%; color:#666; font-weight:normal; }
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table { border:none; border-collapse: collapse; width:100%; }
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td, th { vertical-align:top; padding:2px 3px; }
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th { width:12em; text-align:right; color:#666; padding-right:.5em; }
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#info { background:#f6f6f6; }
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#info ol { margin: 0.5em 4em; }
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#info ol li { font-family: monospace; }
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#summary { background: #ffc; }
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#explanation { background:#eee; border-bottom: 0px none; }
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</style>
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</head>
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<body>
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<div id="summary">
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<h1><%=h message %> <span>(<%= status.to_i %>)</span></h1>
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<table class="meta">
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<tr>
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<th>Request Method:</th>
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<td><%=h req.request_method %></td>
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</tr>
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<tr>
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<th>Request URL:</th>
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<td><%=h req.url %></td>
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</tr>
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</table>
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</div>
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<div id="info">
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<p><%= detail %></p>
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</div>
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<div id="explanation">
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<p>
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You're seeing this error because you use <code>Rack::ShowStatus</code>.
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</p>
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</div>
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</body>
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</html>
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HTML
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# :startdoc:
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end
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end
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