lib/sinatra/showexceptions.rb
require 'rack/showexceptions' module Sinatra # Sinatra::ShowExceptions catches all exceptions raised from the app it # wraps. It shows a useful backtrace with the sourcefile and clickable # context, the whole Rack environment and the request data. # # Be careful when you use this on public-facing sites as it could reveal # information helpful to attackers. class ShowExceptions < Rack::ShowExceptions @@eats_errors = Object.new def @@eats_errors.flush(*) end def @@eats_errors.puts(*) end def initialize(app) @app = app @template = ERB.new(TEMPLATE) end def call(env) @app.call(env) rescue Exception => e errors, env["rack.errors"] = env["rack.errors"], @@eats_errors if respond_to?(:prefers_plain_text?) and prefers_plain_text?(env) content_type = "text/plain" body = [dump_exception(e)] else content_type = "text/html" body = pretty(env, e) end env["rack.errors"] = errors [500, {"Content-Type" => content_type, "Content-Length" => Rack::Utils.bytesize(body.join).to_s}, body] end private def frame_class(frame) if frame.filename =~ /lib\/sinatra.*\.rb/ "framework" elsif (defined?(Gem) && frame.filename.include?(Gem.dir)) || frame.filename =~ /\/bin\/(\w+)$/ "system" else "app" end end TEMPLATE = <<-HTML # :nodoc: <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title><%=h exception.class %> at <%=h path %></title> <script type="text/javascript"> //<!-- function toggle(id) { var pre = document.getElementById("pre-" + id); var post = document.getElementById("post-" + id); var context = document.getElementById("context-" + id); if (pre.style.display == 'block') { pre.style.display = 'none'; post.style.display = 'none'; context.style.background = "none"; } else { pre.style.display = 'block'; post.style.display = 'block'; context.style.background = "#fffed9"; } } function toggleBacktrace(){ var bt = document.getElementById("backtrace"); var toggler = document.getElementById("expando"); if (bt.className == 'condensed') { bt.className = 'expanded'; toggler.innerHTML = "(condense)"; } else { bt.className = 'condensed'; toggler.innerHTML = "(expand)"; } } //--> </script> <style type="text/css" media="screen"> * {margin: 0; padding: 0; border: 0; outline: 0;} div.clear {clear: both;} body {background: #EEEEEE; margin: 0; padding: 0; font-family: 'Lucida Grande', 'Lucida Sans Unicode', 'Garuda';} code {font-family: 'Lucida Console', monospace; font-size: 12px;} li {height: 18px;} ul {list-style: none; margin: 0; padding: 0;} ol:hover {cursor: pointer;} ol li {white-space: pre;} #explanation {font-size: 12px; color: #666666; margin: 20px 0 0 100px;} /* WRAP */ #wrap {width: 1000px; background: #FFFFFF; margin: 0 auto; padding: 30px 50px 20px 50px; border-left: 1px solid #DDDDDD; border-right: 1px solid #DDDDDD;} /* HEADER */ #header {margin: 0 auto 25px auto;} #header img {float: left;} #header #summary {float: left; margin: 12px 0 0 20px; width:660px; font-family: 'Lucida Grande', 'Lucida Sans Unicode';} h1 {margin: 0; font-size: 36px; color: #981919;} h2 {margin: 0; font-size: 22px; color: #333333;} #header ul {margin: 0; font-size: 12px; color: #666666;} #header ul li strong{color: #444444;} #header ul li {display: inline; padding: 0 10px;} #header ul li.first {padding-left: 0;} #header ul li.last {border: 0; padding-right: 0;} /* BODY */ #backtrace, #get, #post, #cookies, #rack {width: 980px; margin: 0 auto 10px auto;} p#nav {float: right; font-size: 14px;} /* BACKTRACE */ a#expando {float: left; padding-left: 5px; color: #666666; font-size: 14px; text-decoration: none; cursor: pointer;} a#expando:hover {text-decoration: underline;} h3 {float: left; width: 100px; margin-bottom: 10px; color: #981919; font-size: 14px; font-weight: bold;} #nav a {color: #666666; text-decoration: none; padding: 0 5px;} #backtrace li.frame-info {background: #f7f7f7; padding-left: 10px; font-size: 12px; color: #333333;} #backtrace ul {list-style-position: outside; border: 1px solid #E9E9E9; border-bottom: 0;} #backtrace ol {width: 920px; margin-left: 50px; font: 10px 'Lucida Console', monospace; color: #666666;} #backtrace ol li {border: 0; border-left: 1px solid #E9E9E9; padding: 2px 0;} #backtrace ol code {font-size: 10px; color: #555555; padding-left: 5px;} #backtrace-ul li {border-bottom: 1px solid #E9E9E9; height: auto; padding: 3px 0;} #backtrace-ul .code {padding: 6px 0 4px 0;} #backtrace.condensed .system, #backtrace.condensed .framework {display:none;} /* REQUEST DATA */ p.no-data {padding-top: 2px; font-size: 12px; color: #666666;} table.req {width: 980px; text-align: left; font-size: 12px; color: #666666; padding: 0; border-spacing: 0; border: 1px solid #EEEEEE; border-bottom: 0; border-left: 0; clear:both} table.req tr th {padding: 2px 10px; font-weight: bold; background: #F7F7F7; border-bottom: 1px solid #EEEEEE; border-left: 1px solid #EEEEEE;} table.req tr td {padding: 2px 20px 2px 10px; border-bottom: 1px solid #EEEEEE; border-left: 1px solid #EEEEEE;} /* HIDE PRE/POST CODE AT START */ .pre-context, .post-context {display: none;} table td.code {width:750px} table td.code div {width:750px;overflow:hidden} </style> </head> <body> <div id="wrap"> <div id="header"> <img src="<%= env['SCRIPT_NAME'] %>/__sinatra__/500.png" alt="application error" height="161" width="313" /> <div id="summary"> <h1><strong><%=h exception.class %></strong> at <strong><%=h path %> </strong></h1> <h2><%=h exception.message %></h2> <ul> <li class="first"><strong>file:</strong> <code> <%=h frames.first.filename.split("/").last %></code></li> <li><strong>location:</strong> <code><%=h frames.first.function %> </code></li> <li class="last"><strong>line: </strong> <%=h frames.first.lineno %></li> </ul> </div> <div class="clear"></div> </div> <div id="backtrace" class='condensed'> <h3>BACKTRACE</h3> <p><a href="#" id="expando" onclick="toggleBacktrace(); return false">(expand)</a></p> <p id="nav"><strong>JUMP TO:</strong> <a href="#get-info">GET</a> <a href="#post-info">POST</a> <a href="#cookie-info">COOKIES</a> <a href="#env-info">ENV</a> </p> <div class="clear"></div> <ul id="backtrace-ul"> <% id = 1 %> <% frames.each do |frame| %> <% if frame.context_line && frame.context_line != "#" %> <li class="frame-info <%= frame_class(frame) %>"> <code><%=h frame.filename %></code> in <code><strong><%=h frame.function %></strong></code> </li> <li class="code <%= frame_class(frame) %>"> <% if frame.pre_context %> <ol start="<%=h frame.pre_context_lineno + 1 %>" class="pre-context" id="pre-<%= id %>" onclick="toggle(<%= id %>);"> <% frame.pre_context.each do |line| %> <li class="pre-context-line"><code><%=h line %></code></li> <% end %> </ol> <% end %> <ol start="<%= frame.lineno %>" class="context" id="<%= id %>" onclick="toggle(<%= id %>);"> <li class="context-line" id="context-<%= id %>"><code><%= h frame.context_line %></code></li> </ol> <% if frame.post_context %> <ol start="<%=h frame.lineno + 1 %>" class="post-context" id="post-<%= id %>" onclick="toggle(<%= id %>);"> <% frame.post_context.each do |line| %> <li class="post-context-line"><code><%=h line %></code></li> <% end %> </ol> <% end %> <div class="clear"></div> </li> <% end %> <% id += 1 %> <% end %> </ul> </div> <!-- /BACKTRACE --> <div id="get"> <h3 id="get-info">GET</h3> <% if req.GET and not req.GET.empty? %> <table class="req"> <tr> <th>Variable</th> <th>Value</th> </tr> <% req.GET.sort_by { |k, v| k.to_s }.each { |key, val| %> <tr> <td><%=h key %></td> <td class="code"><div><%=h val.inspect %></div></td> </tr> <% } %> </table> <% else %> <p class="no-data">No GET data.</p> <% end %> <div class="clear"></div> </div> <!-- /GET --> <div id="post"> <h3 id="post-info">POST</h3> <% if req.POST and not req.POST.empty? %> <table class="req"> <tr> <th>Variable</th> <th>Value</th> </tr> <% req.POST.sort_by { |k, v| k.to_s }.each { |key, val| %> <tr> <td><%=h key %></td> <td class="code"><div><%=h val.inspect %></div></td> </tr> <% } %> </table> <% else %> <p class="no-data">No POST data.</p> <% end %> <div class="clear"></div> </div> <!-- /POST --> <div id="cookies"> <h3 id="cookie-info">COOKIES</h3> <% unless req.cookies.empty? %> <table class="req"> <tr> <th>Variable</th> <th>Value</th> </tr> <% req.cookies.each { |key, val| %> <tr> <td><%=h key %></td> <td class="code"><div><%=h val.inspect %></div></td> </tr> <% } %> </table> <% else %> <p class="no-data">No cookie data.</p> <% end %> <div class="clear"></div> </div> <!-- /COOKIES --> <div id="rack"> <h3 id="env-info">Rack ENV</h3> <table class="req"> <tr> <th>Variable</th> <th>Value</th> </tr> <% env.sort_by { |k, v| k.to_s }.each { |key, val| %> <tr> <td><%=h key %></td> <td class="code"><div><%=h val %></div></td> </tr> <% } %> </table> <div class="clear"></div> </div> <!-- /RACK ENV --> <p id="explanation">You're seeing this error because you have enabled the <code>show_exceptions</code> setting.</p> </div> <!-- /WRAP --> </body> </html> HTML end end