This file is indexed.

/usr/share/perl5/Catalyst/Plugin/StackTrace.pm is in libcatalyst-plugin-stacktrace-perl 0.12-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
package Catalyst::Plugin::StackTrace;
use 5.008001;
use Moose;
with 'MooseX::Emulate::Class::Accessor::Fast';
use Devel::StackTrace;
use HTML::Entities;
use Scalar::Util qw/blessed/;
use MRO::Compat;
use namespace::autoclean;

our $VERSION = '0.12';

__PACKAGE__->mk_accessors('_stacktrace');

sub execute {
    my $c = shift;


    my $conf = $c->config->{stacktrace};

    return $c->next::method(@_) 
      unless defined $conf->{enable} && $conf->{enable}
          || !defined $conf->{enable} && $c->debug;

    local $SIG{__DIE__} = sub {
        my $error = shift;

        # ignore if the error is a Tree::Simple object
        # because FindByUID uses an internal die several times per request
        return if ( blessed($error) && $error->isa('Tree::Simple') );

        my $ignore_package = [ 'Catalyst::Plugin::StackTrace' ];
        my $ignore_class   = [];

        if ( $c->config->{stacktrace}->{verbose} < 2 ) {
            $ignore_package = [
                qw/
                   Catalyst
                   Catalyst::Action
                   Catalyst::Base
                   Catalyst::Dispatcher
                   Catalyst::Plugin::StackTrace
                   Catalyst::Plugin::Static::Simple
                   NEXT
                   Class::C3
                   main
                  /
            ];
            $ignore_class = [
                qw/
                   Catalyst::Engine
                  /
            ];
        }

        # Devel::StackTrace dies sometimes, and dying in $SIG{__DIE__} does bad
        # things
        my $trace;
        {
            local $@;
            eval {
                $trace = Devel::StackTrace->new(
                    ignore_package   => $ignore_package,
                    ignore_class     => $ignore_class,
                );
            };
        }
        die $error unless defined $trace;

        my @frames = $c->config->{stacktrace}->{reverse} ?
        reverse $trace->frames : $trace->frames;

        my $keep_frames = [];
        for my $frame ( @frames ) {
            # only display frames from the user's app unless verbose
            if ( !$c->config->{stacktrace}->{verbose} ) {
                my $app = "$c";
                $app =~ s/=.*//;
                next unless $frame->package =~ /^$app/;
            }

            push @{$keep_frames}, {
                pkg  => $frame->package,
                file => $frame->filename,
                line => $frame->line,
            };
        }
        $c->_stacktrace( $keep_frames );

        die $error;
    };

    return $c->next::method(@_);
}

sub finalize_error {
    my $c = shift;

    $c->next::method(@_);

    if ( $c->debug ) {
        return unless ref $c->_stacktrace eq 'ARRAY';

        # insert the stack trace into the error screen above the "infos" div
        my $html = qq{
            <style type="text/css">
                div.trace {
                    background-color: #eee;
                    border: 1px solid #575;
                }
                div#stacktrace table {
                    width: 100%;
                }
                div#stacktrace th, td {
                    padding-right: 1.5em;
                    text-align: left;
                }
                div#stacktrace .line {
                    color: #000;
                    font-weight: strong;
                }
            </style>
            <div class="trace error">
            <h2><a href="#" onclick="toggleDump('stacktrace'); return false">Stack Trace</a></h2>
                <div id="stacktrace">
                    <table>
                       <tr>
                           <th>Package</th>
                           <th>Line   </th>
                           <th>File   </th>
                       </tr>
        };
        for my $frame ( @{$c->_stacktrace} ) {

            # clean up the common filename of
            # .../MyApp/script/../lib/...
            if ( $frame->{file} =~ /../ ) {
                $frame->{file} =~ s{script/../}{};
            }

            my $pkg  = encode_entities $frame->{pkg};
            my $line = encode_entities $frame->{line};
            my $file = encode_entities $frame->{file};
            my $code_preview = _print_context(
                $frame->{file},
                $frame->{line},
                $c->config->{stacktrace}->{context}
            );

            $html .= qq{
                       <tr>
                           <td>$pkg</td>
                           <td>$line</td>
                           <td>$file</td>
                       </tr>
                       <tr>
                           <td colspan="3"><pre><p><code class="error">$code_preview</code></p></pre></td>
                       </tr>
            };
        }
        $html .= qq{
                    </table>
                </div>
            </div>
        };

        $c->res->{body} =~ s{<div class="infos">}{$html<div class="infos">};
    }
}

sub setup {
    my $c = shift;

    $c->next::method(@_);

    $c->config->{stacktrace}->{context} ||= 3;
    $c->config->{stacktrace}->{verbose} ||= 0;
}

sub _print_context {
    my ( $file, $linenum, $context ) = @_;

    my $code;
    if ( -f $file ) {
        my $start = $linenum - $context;
        my $end   = $linenum + $context;
        $start = $start < 1 ? 1 : $start;
        if ( my $fh = IO::File->new( $file, 'r' ) ) {
            my $cur_line = 0;
            while ( my $line = <$fh> ) {
                ++$cur_line;
                last if $cur_line > $end;
                next if $cur_line < $start;
                my @tag = $cur_line == $linenum ? ('<strong class="line">', '</strong>') : (q{}, q{});
                $code .= sprintf(
                    '%s%5d: %s%s',
                        $tag[0],
                        $cur_line,
                        $line ? encode_entities $line : q{},
                        $tag[1],
                );
            }
        }
    }
    return $code;
}

1;
__END__

=pod

=head1 NAME

Catalyst::Plugin::StackTrace - Display a stack trace on the debug screen

=head1 SYNOPSIS

    use Catalyst qw/-Debug StackTrace/;

=head1 DESCRIPTION

This plugin will enhance the standard Catalyst debug screen by including
a stack trace of your appliation up to the point where the error occurred.
Each stack frame is displayed along with the package name, line number, file
name, and code context surrounding the line number.

This plugin is only active in -Debug mode by default, but can be enabled by
setting the C<enable> config option.

=head1 CONFIGURATION

Configuration is optional and is specified in MyApp->config->{stacktrace}.

=head2 enable

Allows you forcibly enable or disalbe this plugin, ignoring the current 
debug setting. If this option is defined, its value will be used.

=head2 context

The number of context lines of code to display on either side of the stack
frame line.  Defaults to 3.

=head2 reverse

By default, the stack frames are shown in from "top" to "bottom"
(newest to oldest). Enabling this option reverses the stack frames so they will
be displayed "bottom" to "top", or from the callers perspective.

=head2 verbose

This option sets the amount of stack frames you want to see in the stack
trace.  It defaults to 0, meaning only frames from your application's
namespace are shown.  You can use levels 1 and 2 for deeper debugging.

If set to 1, the stack trace will include frames from packages outside of
your application's namespace, but not from most of the Catalyst internals.
Packages ignored at this level include:

    Catalyst
    Catalyst::Action
    Catalyst::Base
    Catalyst::Dispatcher
    Catalyst::Engine::*
    Catalyst::Plugin::StackTrace
    Catalyst::Plugin::Static::Simple
    NEXT
    main

If set to 2, the stack trace will include frames from everything except this
module.

=head1 INTERNAL METHODS

The following methods are extended by this plugin.

=over 4

=item execute

In execute, we create a local die handler to generate the stack trace.

=item finalize_error

In finalize_error, we inject the stack trace HTML into the debug screen below
the error message.

=item setup

=back

=head1 SEE ALSO

L<Catalyst>

=head1 AUTHORS

Andy Grundman, <andy@hybridized.org>

Matt S. Trout, <mst@shadowcatsystems.co.uk>

=head1 THANKS

The authors of L<CGI::Application::Plugin::DebugScreen>, from which a lot of
code was used.

=head1 COPYRIGHT

Copyright (c) 2005 - 2009
the Catalyst::Plugin::StackTrace L</AUTHORS>
as listed above.

=head1 LICENSE

This program is free software, you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut