350 lines
11 KiB
Ruby
350 lines
11 KiB
Ruby
require 'ostruct'
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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::ShowExceptions catches all exceptions raised from the app it
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# wraps. It shows a useful backtrace with the sourcefile and
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# clickable context, the whole Rack environment and the request
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# data.
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#
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# Be careful when you use this on public-facing sites as it could
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# reveal information helpful to attackers.
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class ShowExceptions
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CONTEXT = 7
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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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@app.call(env)
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rescue StandardError, LoadError, SyntaxError => e
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backtrace = pretty(env, e)
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[500,
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{"Content-Type" => "text/html",
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"Content-Length" => backtrace.join.size.to_s},
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backtrace]
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end
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def pretty(env, exception)
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req = Rack::Request.new(env)
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path = (req.script_name + req.path_info).squeeze("/")
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frames = exception.backtrace.map { |line|
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frame = OpenStruct.new
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if line =~ /(.*?):(\d+)(:in `(.*)')?/
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frame.filename = $1
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frame.lineno = $2.to_i
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frame.function = $4
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begin
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lineno = frame.lineno-1
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lines = ::File.readlines(frame.filename)
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frame.pre_context_lineno = [lineno-CONTEXT, 0].max
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frame.pre_context = lines[frame.pre_context_lineno...lineno]
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frame.context_line = lines[lineno].chomp
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frame.post_context_lineno = [lineno+CONTEXT, lines.size].min
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frame.post_context = lines[lineno+1..frame.post_context_lineno]
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rescue
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end
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frame
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else
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nil
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end
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}.compact
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env["rack.errors"].puts "#{exception.class}: #{exception.message}"
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env["rack.errors"].puts exception.backtrace.map { |l| "\t" + l }
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env["rack.errors"].flush
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[@template.result(binding)]
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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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<meta name="robots" content="NONE,NOARCHIVE" />
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<title><%=h exception.class %> at <%=h path %></title>
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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; }
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body>div { border-bottom:1px solid #ddd; }
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h1 { font-weight:normal; }
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h2 { margin-bottom:.8em; }
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h2 span { font-size:80%; color:#666; font-weight:normal; }
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h3 { margin:1em 0 .5em 0; }
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h4 { margin:0 0 .5em 0; font-weight: normal; }
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table {
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border:1px solid #ccc; border-collapse: collapse; background:white; }
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tbody td, tbody th { vertical-align:top; padding:2px 3px; }
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thead th {
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padding:1px 6px 1px 3px; background:#fefefe; text-align:left;
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font-weight:normal; font-size:11px; border:1px solid #ddd; }
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tbody th { text-align:right; color:#666; padding-right:.5em; }
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table.vars { margin:5px 0 2px 40px; }
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table.vars td, table.req td { font-family:monospace; }
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table td.code { width:100%;}
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table td.code div { overflow:hidden; }
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table.source th { color:#666; }
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table.source td {
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font-family:monospace; white-space:pre; border-bottom:1px solid #eee; }
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ul.traceback { list-style-type:none; }
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ul.traceback li.frame { margin-bottom:1em; }
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div.context { margin: 10px 0; }
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div.context ol {
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padding-left:30px; margin:0 10px; list-style-position: inside; }
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div.context ol li {
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font-family:monospace; white-space:pre; color:#666; cursor:pointer; }
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div.context ol.context-line li { color:black; background-color:#ccc; }
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div.context ol.context-line li span { float: right; }
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div.commands { margin-left: 40px; }
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div.commands a { color:black; text-decoration:none; }
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#summary { background: #ffc; }
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#summary h2 { font-weight: normal; color: #666; }
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#summary ul#quicklinks { list-style-type: none; margin-bottom: 2em; }
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#summary ul#quicklinks li { float: left; padding: 0 1em; }
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#summary ul#quicklinks>li+li { border-left: 1px #666 solid; }
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#explanation { background:#eee; }
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#template, #template-not-exist { background:#f6f6f6; }
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#template-not-exist ul { margin: 0 0 0 20px; }
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#traceback { background:#eee; }
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#requestinfo { background:#f6f6f6; padding-left:120px; }
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#summary table { border:none; background:transparent; }
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#requestinfo h2, #requestinfo h3 { position:relative; margin-left:-100px; }
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#requestinfo h3 { margin-bottom:-1em; }
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.error { background: #ffc; }
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.specific { color:#cc3300; font-weight:bold; }
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</style>
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<script type="text/javascript">
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//<!--
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function getElementsByClassName(oElm, strTagName, strClassName){
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// Written by Jonathan Snook, http://www.snook.ca/jon;
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// Add-ons by Robert Nyman, http://www.robertnyman.com
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var arrElements = (strTagName == "*" && document.all)? document.all :
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oElm.getElementsByTagName(strTagName);
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var arrReturnElements = new Array();
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strClassName = strClassName.replace(/\-/g, "\\-");
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var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$$)");
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var oElement;
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for(var i=0; i<arrElements.length; i++){
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oElement = arrElements[i];
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if(oRegExp.test(oElement.className)){
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arrReturnElements.push(oElement);
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}
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}
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return (arrReturnElements)
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}
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function hideAll(elems) {
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for (var e = 0; e < elems.length; e++) {
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elems[e].style.display = 'none';
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}
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}
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window.onload = function() {
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hideAll(getElementsByClassName(document, 'table', 'vars'));
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hideAll(getElementsByClassName(document, 'ol', 'pre-context'));
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hideAll(getElementsByClassName(document, 'ol', 'post-context'));
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}
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function toggle() {
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for (var i = 0; i < arguments.length; i++) {
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var e = document.getElementById(arguments[i]);
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if (e) {
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e.style.display = e.style.display == 'none' ? 'block' : 'none';
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}
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}
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return false;
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}
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function varToggle(link, id) {
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toggle('v' + id);
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var s = link.getElementsByTagName('span')[0];
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var uarr = String.fromCharCode(0x25b6);
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var darr = String.fromCharCode(0x25bc);
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s.innerHTML = s.innerHTML == uarr ? darr : uarr;
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return false;
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}
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//-->
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</script>
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</head>
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<body>
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<div id="summary">
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<h1><%=h exception.class %> at <%=h path %></h1>
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<h2><%=h exception.message %></h2>
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<table><tr>
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<th>Ruby</th>
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<td><code><%=h frames.first.filename %></code>: in <code><%=h frames.first.function %></code>, line <%=h frames.first.lineno %></td>
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</tr><tr>
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<th>Web</th>
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<td><code><%=h req.request_method %> <%=h(req.host + path)%></code></td>
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</tr></table>
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<h3>Jump to:</h3>
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<ul id="quicklinks">
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<li><a href="#get-info">GET</a></li>
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<li><a href="#post-info">POST</a></li>
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<li><a href="#cookie-info">Cookies</a></li>
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<li><a href="#env-info">ENV</a></li>
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</ul>
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</div>
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<div id="traceback">
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<h2>Traceback <span>(innermost first)</span></h2>
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<ul class="traceback">
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<% frames.each { |frame| %>
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<li class="frame">
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<code><%=h frame.filename %></code>: in <code><%=h frame.function %></code>
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<% if frame.context_line %>
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<div class="context" id="c<%=h frame.object_id %>">
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<% if frame.pre_context %>
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<ol start="<%=h frame.pre_context_lineno+1 %>" class="pre-context" id="pre<%=h frame.object_id %>">
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<% frame.pre_context.each { |line| %>
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<li onclick="toggle('pre<%=h frame.object_id %>', 'post<%=h frame.object_id %>')"><%=h line %></li>
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<% } %>
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</ol>
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<% end %>
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<ol start="<%=h frame.lineno %>" class="context-line">
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<li onclick="toggle('pre<%=h frame.object_id %>', 'post<%=h frame.object_id %>')"><%=h frame.context_line %><span>...</span></li></ol>
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<% if frame.post_context %>
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<ol start='<%=h frame.lineno+1 %>' class="post-context" id="post<%=h frame.object_id %>">
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<% frame.post_context.each { |line| %>
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<li onclick="toggle('pre<%=h frame.object_id %>', 'post<%=h frame.object_id %>')"><%=h line %></li>
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<% } %>
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</ol>
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<% end %>
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</div>
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<% end %>
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</li>
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<% } %>
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</ul>
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</div>
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<div id="requestinfo">
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<h2>Request information</h2>
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<h3 id="get-info">GET</h3>
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<% unless req.GET.empty? %>
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<table class="req">
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<thead>
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<tr>
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<th>Variable</th>
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<th>Value</th>
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</tr>
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</thead>
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<tbody>
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<% req.GET.sort_by { |k, v| k.to_s }.each { |key, val| %>
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<tr>
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<td><%=h key %></td>
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<td class="code"><div><%=h val.inspect %></div></td>
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</tr>
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<% } %>
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</tbody>
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</table>
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<% else %>
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<p>No GET data.</p>
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<% end %>
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<h3 id="post-info">POST</h3>
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<% unless req.POST.empty? %>
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<table class="req">
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<thead>
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<tr>
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<th>Variable</th>
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<th>Value</th>
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</tr>
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</thead>
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<tbody>
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<% req.POST.sort_by { |k, v| k.to_s }.each { |key, val| %>
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<tr>
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<td><%=h key %></td>
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<td class="code"><div><%=h val.inspect %></div></td>
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</tr>
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<% } %>
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</tbody>
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</table>
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<% else %>
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<p>No POST data.</p>
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<% end %>
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<h3 id="cookie-info">COOKIES</h3>
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<% unless req.cookies.empty? %>
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<table class="req">
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<thead>
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<tr>
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<th>Variable</th>
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<th>Value</th>
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</tr>
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</thead>
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<tbody>
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<% req.cookies.each { |key, val| %>
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<tr>
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<td><%=h key %></td>
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<td class="code"><div><%=h val.inspect %></div></td>
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</tr>
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<% } %>
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</tbody>
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</table>
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<% else %>
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<p>No cookie data.</p>
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<% end %>
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<h3 id="env-info">Rack ENV</h3>
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<table class="req">
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<thead>
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<tr>
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<th>Variable</th>
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<th>Value</th>
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</tr>
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</thead>
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<tbody>
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<% env.sort_by { |k, v| k.to_s }.each { |key, val| %>
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<tr>
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<td><%=h key %></td>
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<td class="code"><div><%=h val %></div></td>
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</tr>
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<% } %>
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</tbody>
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</table>
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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::ShowExceptions</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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