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opt/alt/ruby25/lib64/ruby/gems/2.5.0/gems/rack-3.0.8/lib/rack/_[ Not.Writable ]

File://opt/alt/ruby25/lib64/ruby/gems/2.5.0/gems/rack-3.0.8/lib/rack/show_exceptions.rb

# frozen_string_literal: true

require 'ostruct'
require 'erb'

require_relative 'constants'
require_relative 'utils'
require_relative 'request'

module Rack
  # Rack::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
    CONTEXT = 7

    def initialize(app)
      @app = app
    end

    def call(env)
      @app.call(env)
    rescue StandardError, LoadError, SyntaxError => e
      exception_string = dump_exception(e)

      env[RACK_ERRORS].puts(exception_string)
      env[RACK_ERRORS].flush

      if accepts_html?(env)
        content_type = "text/html"
        body = pretty(env, e)
      else
        content_type = "text/plain"
        body = exception_string
      end

      [
        500,
        {
          CONTENT_TYPE => content_type,
          CONTENT_LENGTH => body.bytesize.to_s,
        },
        [body],
      ]
    end

    def prefers_plaintext?(env)
      !accepts_html?(env)
    end

    def accepts_html?(env)
      Rack::Utils.best_q_match(env["HTTP_ACCEPT"], %w[text/html])
    end
    private :accepts_html?

    def dump_exception(exception)
      if exception.respond_to?(:detailed_message)
        message = exception.detailed_message(highlight: false)
      else
        message = exception.message
      end
      string = "#{exception.class}: #{message}\n".dup
      string << exception.backtrace.map { |l| "\t#{l}" }.join("\n")
      string
    end

    def pretty(env, exception)
      req = Rack::Request.new(env)

      # This double assignment is to prevent an "unused variable" warning.
      # Yes, it is dumb, but I don't like Ruby yelling at me.
      path = path = (req.script_name + req.path_info).squeeze("/")

      # This double assignment is to prevent an "unused variable" warning.
      # Yes, it is dumb, but I don't like Ruby yelling at me.
      frames = frames = exception.backtrace.map { |line|
        frame = OpenStruct.new
        if line =~ /(.*?):(\d+)(:in `(.*)')?/
          frame.filename = $1
          frame.lineno = $2.to_i
          frame.function = $4

          begin
            lineno = frame.lineno - 1
            lines = ::File.readlines(frame.filename)
            frame.pre_context_lineno = [lineno - CONTEXT, 0].max
            frame.pre_context = lines[frame.pre_context_lineno...lineno]
            frame.context_line = lines[lineno].chomp
            frame.post_context_lineno = [lineno + CONTEXT, lines.size].min
            frame.post_context = lines[lineno + 1..frame.post_context_lineno]
          rescue
          end

          frame
        else
          nil
        end
      }.compact

      template.result(binding)
    end

    def template
      TEMPLATE
    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 <www.djangoproject.com>
    # Copyright (c) Django Software Foundation and individual contributors.
    # Used under the modified BSD license:
    # http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5
    TEMPLATE = ERB.new(<<-'HTML'.gsub(/^      /, ''))
      <!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" />
        <meta name="robots" content="NONE,NOARCHIVE" />
        <title><%=h exception.class %> at <%=h path %></title>
        <style type="text/css">
          html * { padding:0; margin:0; }
          body * { padding:10px 20px; }
          body * * { padding:0; }
          body { font:small sans-serif; }
          body>div { border-bottom:1px solid #ddd; }
          h1 { font-weight:normal; }
          h2 { margin-bottom:.8em; }
          h2 span { font-size:80%; color:#666; font-weight:normal; }
          h3 { margin:1em 0 .5em 0; }
          h4 { margin:0 0 .5em 0; font-weight: normal; }
          table {
              border:1px solid #ccc; border-collapse: collapse; background:white; }
          tbody td, tbody th { vertical-align:top; padding:2px 3px; }
          thead th {
              padding:1px 6px 1px 3px; background:#fefefe; text-align:left;
              font-weight:normal; font-size:11px; border:1px solid #ddd; }
          tbody th { text-align:right; color:#666; padding-right:.5em; }
          table.vars { margin:5px 0 2px 40px; }
          table.vars td, table.req td { font-family:monospace; }
          table td.code { width:100%;}
          table td.code div { overflow:hidden; }
          table.source th { color:#666; }
          table.source td {
              font-family:monospace; white-space:pre; border-bottom:1px solid #eee; }
          ul.traceback { list-style-type:none; }
          ul.traceback li.frame { margin-bottom:1em; }
          div.context { margin: 10px 0; }
          div.context ol {
              padding-left:30px; margin:0 10px; list-style-position: inside; }
          div.context ol li {
              font-family:monospace; white-space:pre; color:#666; cursor:pointer; }
          div.context ol.context-line li { color:black; background-color:#ccc; }
          div.context ol.context-line li span { float: right; }
          div.commands { margin-left: 40px; }
          div.commands a { color:black; text-decoration:none; }
          #summary { background: #ffc; }
          #summary h2 { font-family: monospace; font-weight: normal; color: #666; white-space: pre-wrap; }
          #summary ul#quicklinks { list-style-type: none; margin-bottom: 2em; }
          #summary ul#quicklinks li { float: left; padding: 0 1em; }
          #summary ul#quicklinks>li+li { border-left: 1px #666 solid; }
          #explanation { background:#eee; }
          #template, #template-not-exist { background:#f6f6f6; }
          #template-not-exist ul { margin: 0 0 0 20px; }
          #traceback { background:#eee; }
          #requestinfo { background:#f6f6f6; padding-left:120px; }
          #summary table { border:none; background:transparent; }
          #requestinfo h2, #requestinfo h3 { position:relative; margin-left:-100px; }
          #requestinfo h3 { margin-bottom:-1em; }
          .error { background: #ffc; }
          .specific { color:#cc3300; font-weight:bold; }
        </style>
        <script type="text/javascript">
        //<!--
          function getElementsByClassName(oElm, strTagName, strClassName){
              // Written by Jonathan Snook, http://www.snook.ca/jon;
              // Add-ons by Robert Nyman, http://www.robertnyman.com
              var arrElements = (strTagName == "*" && document.all)? document.all :
              oElm.getElementsByTagName(strTagName);
              var arrReturnElements = new Array();
              strClassName = strClassName.replace(/\-/g, "\\-");
              var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$$)");
              var oElement;
              for(var i=0; i<arrElements.length; i++){
                  oElement = arrElements[i];
                  if(oRegExp.test(oElement.className)){
                      arrReturnElements.push(oElement);
                  }
              }
              return (arrReturnElements)
          }
          function hideAll(elems) {
            for (var e = 0; e < elems.length; e++) {
              elems[e].style.display = 'none';
            }
          }
          window.onload = function() {
            hideAll(getElementsByClassName(document, 'table', 'vars'));
            hideAll(getElementsByClassName(document, 'ol', 'pre-context'));
            hideAll(getElementsByClassName(document, 'ol', 'post-context'));
          }
          function toggle() {
            for (var i = 0; i < arguments.length; i++) {
              var e = document.getElementById(arguments[i]);
              if (e) {
                e.style.display = e.style.display == 'none' ? 'block' : 'none';
              }
            }
            return false;
          }
          function varToggle(link, id) {
            toggle('v' + id);
            var s = link.getElementsByTagName('span')[0];
            var uarr = String.fromCharCode(0x25b6);
            var darr = String.fromCharCode(0x25bc);
            s.innerHTML = s.innerHTML == uarr ? darr : uarr;
            return false;
          }
          //-->
        </script>
      </head>
      <body>

      <div id="summary">
        <h1><%=h exception.class %> at <%=h path %></h1>
      <% if exception.respond_to?(:detailed_message) %>
        <h2><%=h exception.detailed_message(highlight: false) %></h2>
      <% else %>
        <h2><%=h exception.message %></h2>
      <% end %>
        <table><tr>
          <th>Ruby</th>
          <td>
      <% if first = frames.first %>
            <code><%=h first.filename %></code>: in <code><%=h first.function %></code>, line <%=h frames.first.lineno %>
      <% else %>
            unknown location
      <% end %>
          </td>
        </tr><tr>
          <th>Web</th>
          <td><code><%=h req.request_method %> <%=h(req.host + path)%></code></td>
        </tr></table>

        <h3>Jump to:</h3>
        <ul id="quicklinks">
          <li><a href="#get-info">GET</a></li>
          <li><a href="#post-info">POST</a></li>
          <li><a href="#cookie-info">Cookies</a></li>
          <li><a href="#env-info">ENV</a></li>
        </ul>
      </div>

      <div id="traceback">
        <h2>Traceback <span>(innermost first)</span></h2>
        <ul class="traceback">
      <% frames.each { |frame| %>
            <li class="frame">
              <code><%=h frame.filename %></code>: in <code><%=h frame.function %></code>

                <% if frame.context_line %>
                <div class="context" id="c<%=h frame.object_id %>">
                    <% if frame.pre_context %>
                    <ol start="<%=h frame.pre_context_lineno+1 %>" class="pre-context" id="pre<%=h frame.object_id %>">
                      <% frame.pre_context.each { |line| %>
                      <li onclick="toggle('pre<%=h frame.object_id %>', 'post<%=h frame.object_id %>')"><%=h line %></li>
                      <% } %>
                    </ol>
                    <% end %>

                  <ol start="<%=h frame.lineno %>" class="context-line">
                    <li onclick="toggle('pre<%=h frame.object_id %>', 'post<%=h frame.object_id %>')"><%=h frame.context_line %><span>...</span></li></ol>

                    <% if frame.post_context %>
                    <ol start='<%=h frame.lineno+1 %>' class="post-context" id="post<%=h frame.object_id %>">
                      <% frame.post_context.each { |line| %>
                      <li onclick="toggle('pre<%=h frame.object_id %>', 'post<%=h frame.object_id %>')"><%=h line %></li>
                      <% } %>
                    </ol>
                    <% end %>
                </div>
                <% end %>
            </li>
      <% } %>
        </ul>
      </div>

      <div id="requestinfo">
        <h2>Request information</h2>

        <h3 id="get-info">GET</h3>
        <% if req.GET and not req.GET.empty? %>
          <table class="req">
            <thead>
              <tr>
                <th>Variable</th>
                <th>Value</th>
              </tr>
            </thead>
            <tbody>
                <% 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>
                <% } %>
            </tbody>
          </table>
        <% else %>
          <p>No GET data.</p>
        <% end %>

        <h3 id="post-info">POST</h3>
        <% if ((req.POST and not req.POST.empty?) rescue (no_post_data = "Invalid POST data"; nil)) %>
          <table class="req">
            <thead>
              <tr>
                <th>Variable</th>
                <th>Value</th>
              </tr>
            </thead>
            <tbody>
                <% 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>
                <% } %>
            </tbody>
          </table>
        <% else %>
          <p><%= no_post_data || "No POST data" %>.</p>
        <% end %>


        <h3 id="cookie-info">COOKIES</h3>
        <% unless req.cookies.empty? %>
          <table class="req">
            <thead>
              <tr>
                <th>Variable</th>
                <th>Value</th>
              </tr>
            </thead>
            <tbody>
              <% req.cookies.each { |key, val| %>
                <tr>
                  <td><%=h key %></td>
                  <td class="code"><div><%=h val.inspect %></div></td>
                </tr>
              <% } %>
            </tbody>
          </table>
        <% else %>
          <p>No cookie data.</p>
        <% end %>

        <h3 id="env-info">Rack ENV</h3>
          <table class="req">
            <thead>
              <tr>
                <th>Variable</th>
                <th>Value</th>
              </tr>
            </thead>
            <tbody>
                <% env.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>
                <% } %>
            </tbody>
          </table>

      </div>

      <div id="explanation">
        <p>
          You're seeing this error because you use <code>Rack::ShowExceptions</code>.
        </p>
      </div>

      </body>
      </html>
    HTML

    # :startdoc:
  end
end

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