summaryrefslogtreecommitdiffstats
path: root/Bugzilla/Attachment.pm
blob: 6a798d046e62fd7b8222dda8503426f608214a79 (plain)
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
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): Terry Weissman <terry@mozilla.org>
#                 Myk Melez <myk@mozilla.org>
#                 Marc Schumann <wurblzap@gmail.com>
#                 Frédéric Buclin <LpSolit@gmail.com>

use strict;

package Bugzilla::Attachment;

=head1 NAME

Bugzilla::Attachment - a file related to a bug that a user has uploaded
                       to the Bugzilla server

=head1 SYNOPSIS

  use Bugzilla::Attachment;

  # Get the attachment with the given ID.
  my $attachment = Bugzilla::Attachment->get($attach_id);

  # Get the attachments with the given IDs.
  my $attachments = Bugzilla::Attachment->get_list($attach_ids);

=head1 DESCRIPTION

This module defines attachment objects, which represent files related to bugs
that users upload to the Bugzilla server.

=cut

use Bugzilla::Constants;
use Bugzilla::Error;
use Bugzilla::Flag;
use Bugzilla::User;
use Bugzilla::Util;
use Bugzilla::Field;

sub get {
    my $invocant = shift;
    my $id = shift;

    my $attachments = _retrieve([$id]);
    my $self = $attachments->[0];
    bless($self, ref($invocant) || $invocant) if $self;

    return $self;
}

sub get_list {
    my $invocant = shift;
    my $ids = shift;

    my $attachments = _retrieve($ids);
    foreach my $attachment (@$attachments) {
        bless($attachment, ref($invocant) || $invocant);
    }

    return $attachments;
}

sub _retrieve {
    my ($ids) = @_;

    return [] if scalar(@$ids) == 0;

    my @columns = (
        'attachments.attach_id AS id',
        'attachments.bug_id AS bug_id',
        'attachments.description AS description',
        'attachments.mimetype AS contenttype',
        'attachments.submitter_id AS _attacher_id',
        Bugzilla->dbh->sql_date_format('attachments.creation_ts',
                                       '%Y.%m.%d %H:%i') . " AS attached",
        'attachments.filename AS filename',
        'attachments.ispatch AS ispatch',
        'attachments.isurl AS isurl',
        'attachments.isobsolete AS isobsolete',
        'attachments.isprivate AS isprivate'
    );
    my $columns = join(", ", @columns);

    my $records = Bugzilla->dbh->selectall_arrayref("SELECT $columns
                                                     FROM attachments
                                                     WHERE attach_id IN (" .
                                                     join(",", @$ids) . ")
                                                     ORDER BY attach_id",
                                                    { Slice => {} });
    return $records;
}

=pod

=head2 Instance Properties

=over

=item C<id>

the unique identifier for the attachment

=back

=cut

sub id {
    my $self = shift;
    return $self->{id};
}

=over

=item C<bug_id>

the ID of the bug to which the attachment is attached

=back

=cut

# XXX Once Bug.pm slims down sufficiently this should become a reference
# to a bug object.
sub bug_id {
    my $self = shift;
    return $self->{bug_id};
}

=over

=item C<description>

user-provided text describing the attachment

=back

=cut

sub description {
    my $self = shift;
    return $self->{description};
}

=over

=item C<contenttype>

the attachment's MIME media type

=back

=cut

sub contenttype {
    my $self = shift;
    return $self->{contenttype};
}

=over

=item C<attacher>

the user who attached the attachment

=back

=cut

sub attacher {
    my $self = shift;
    return $self->{attacher} if exists $self->{attacher};
    $self->{attacher} = new Bugzilla::User($self->{_attacher_id});
    return $self->{attacher};
}

=over

=item C<attached>

the date and time on which the attacher attached the attachment

=back

=cut

sub attached {
    my $self = shift;
    return $self->{attached};
}

=over

=item C<filename>

the name of the file the attacher attached

=back

=cut

sub filename {
    my $self = shift;
    return $self->{filename};
}

=over

=item C<ispatch>

whether or not the attachment is a patch

=back

=cut

sub ispatch {
    my $self = shift;
    return $self->{ispatch};
}

=over

=item C<isurl>

whether or not the attachment is a URL

=back

=cut

sub isurl {
    my $self = shift;
    return $self->{isurl};
}

=over

=item C<isobsolete>

whether or not the attachment is obsolete

=back

=cut

sub isobsolete {
    my $self = shift;
    return $self->{isobsolete};
}

=over

=item C<isprivate>

whether or not the attachment is private

=back

=cut

sub isprivate {
    my $self = shift;
    return $self->{isprivate};
}

=over

=item C<data>

the content of the attachment

=back

=cut

sub data {
    my $self = shift;
    return $self->{data} if exists $self->{data};

    # First try to get the attachment data from the database.
    ($self->{data}) = Bugzilla->dbh->selectrow_array("SELECT thedata
                                                      FROM attach_data
                                                      WHERE id = ?",
                                                     undef,
                                                     $self->{id});

    # If there's no attachment data in the database, the attachment is stored
    # in a local file, so retrieve it from there.
    if (length($self->{data}) == 0) {
        if (open(AH, $self->_get_local_filename())) {
            local $/;
            binmode AH;
            $self->{data} = <AH>;
            close(AH);
        }
    }

    return $self->{data};
}

=over

=item C<datasize>

the length (in characters) of the attachment content

=back

=cut

# datasize is a property of the data itself, and it's unclear whether we should
# expose it at all, since you can easily derive it from the data itself: in TT,
# attachment.data.size; in Perl, length($attachment->{data}).  But perhaps
# it makes sense for performance reasons, since accessing the data forces it
# to get retrieved from the database/filesystem and loaded into memory,
# while datasize avoids loading the attachment into memory, calling SQL's
# LENGTH() function or stat()ing the file instead.  I've left it in for now.

sub datasize {
    my $self = shift;
    return $self->{datasize} if exists $self->{datasize};

    # If we have already retrieved the data, return its size.
    return length($self->{data}) if exists $self->{data};

    $self->{datasize} =
        Bugzilla->dbh->selectrow_array("SELECT LENGTH(thedata)
                                        FROM attach_data
                                        WHERE id = ?",
                                       undef, $self->{id}) || 0;

    # If there's no attachment data in the database, either the attachment
    # is stored in a local file, and so retrieve its size from the file,
    # or the attachment has been deleted.
    unless ($self->{datasize}) {
        if (open(AH, $self->_get_local_filename())) {
            binmode AH;
            $self->{datasize} = (stat(AH))[7];
            close(AH);
        }
    }

    return $self->{datasize};
}

=over

=item C<flags>

flags that have been set on the attachment

=back

=cut

sub flags {
    my $self = shift;
    return $self->{flags} if exists $self->{flags};

    $self->{flags} = Bugzilla::Flag::match({ 'attach_id' => $self->id });
    return $self->{flags};
}

# Instance methods; no POD documentation here yet because the only ones so far
# are private.

sub _get_local_filename {
    my $self = shift;
    my $hash = ($self->id % 100) + 100;
    $hash =~ s/.*(\d\d)$/group.$1/;
    return bz_locations()->{'attachdir'} . "/$hash/attachment." . $self->id;
}

sub _validate_filename {
    my ($throw_error) = @_;
    my $cgi = Bugzilla->cgi;
    defined $cgi->upload('data')
        || ($throw_error ? ThrowUserError("file_not_specified") : return 0);

    my $filename = $cgi->upload('data');

    # Remove path info (if any) from the file name.  The browser should do this
    # for us, but some are buggy.  This may not work on Mac file names and could
    # mess up file names with slashes in them, but them's the breaks.  We only
    # use this as a hint to users downloading attachments anyway, so it's not
    # a big deal if it munges incorrectly occasionally.
    $filename =~ s/^.*[\/\\]//;

    # Truncate the filename to 100 characters, counting from the end of the
    # string to make sure we keep the filename extension.
    $filename = substr($filename, -100, 100);

    return $filename;
}

sub _validate_data {
    my ($throw_error, $hr_vars) = @_;
    my $cgi = Bugzilla->cgi;
    my $maxsize = $cgi->param('ispatch') ? Bugzilla->params->{'maxpatchsize'} 
                  : Bugzilla->params->{'maxattachmentsize'};
    $maxsize *= 1024; # Convert from K
    my $fh;
    # Skip uploading into a local variable if the user wants to upload huge
    # attachments into local files.
    if (!$cgi->param('bigfile')) {
        $fh = $cgi->upload('data');
    }
    my $data;

    # We could get away with reading only as much as required, except that then
    # we wouldn't have a size to print to the error handler below.
    if (!$cgi->param('bigfile')) {
        # enable 'slurp' mode
        local $/;
        $data = <$fh>;
    }

    $data
        || ($cgi->param('bigfile'))
        || ($throw_error ? ThrowUserError("zero_length_file") : return 0);

    # Windows screenshots are usually uncompressed BMP files which
    # makes for a quick way to eat up disk space. Let's compress them.
    # We do this before we check the size since the uncompressed version
    # could easily be greater than maxattachmentsize.
    if (Bugzilla->params->{'convert_uncompressed_images'}
        && $cgi->param('contenttype') eq 'image/bmp') {
        require Image::Magick;
        my $img = Image::Magick->new(magick=>'bmp');
        $img->BlobToImage($data);
        $img->set(magick=>'png');
        my $imgdata = $img->ImageToBlob();
        $data = $imgdata;
        $cgi->param('contenttype', 'image/png');
        $$hr_vars->{'convertedbmp'} = 1;
    }

    # Make sure the attachment does not exceed the maximum permitted size
    my $len = $data ? length($data) : 0;
    if ($maxsize && $len > $maxsize) {
        my $vars = { filesize => sprintf("%.0f", $len/1024) };
        if ($cgi->param('ispatch')) {
            $throw_error ? ThrowUserError("patch_too_large", $vars) : return 0;
        }
        else {
            $throw_error ? ThrowUserError("file_too_large", $vars) : return 0;
        }
    }

    return $data || '';
}

=pod

=head2 Class Methods

=over

=item C<get_attachments_by_bug($bug_id)>

Description: retrieves and returns the attachments the currently logged in
             user can view for the given bug.

Params:     C<$bug_id> - integer - the ID of the bug for which
            to retrieve and return attachments.

Returns:    a reference to an array of attachment objects.

=cut

sub get_attachments_by_bug {
    my ($class, $bug_id) = @_;
    my $user = Bugzilla->user;
    my $dbh = Bugzilla->dbh;

    # By default, private attachments are not accessible, unless the user
    # is in the insider group or submitted the attachment.
    my $and_restriction = '';
    my @values = ($bug_id);

    unless ($user->is_insider) {
        $and_restriction = 'AND (isprivate = 0 OR submitter_id = ?)';
        push(@values, $user->id);
    }

    my $attach_ids = $dbh->selectcol_arrayref("SELECT attach_id FROM attachments
                                               WHERE bug_id = ? $and_restriction",
                                               undef, @values);
    my $attachments = Bugzilla::Attachment->get_list($attach_ids);
    return $attachments;
}

=pod

=item C<validate_is_patch()>

Description: validates the "patch" flag passed in by CGI.

Returns:    1 on success.

=cut

sub validate_is_patch {
    my ($class, $throw_error) = @_;
    my $cgi = Bugzilla->cgi;

    # Set the ispatch flag to zero if it is undefined, since the UI uses
    # an HTML checkbox to represent this flag, and unchecked HTML checkboxes
    # do not get sent in HTML requests.
    $cgi->param('ispatch', $cgi->param('ispatch') ? 1 : 0);

    # Set the content type to text/plain if the attachment is a patch.
    $cgi->param('contenttype', 'text/plain') if $cgi->param('ispatch');

    return 1;
}

=pod

=item C<validate_description()>

Description: validates the description passed in by CGI.

Returns:    1 on success.

=cut

sub validate_description {
    my ($class, $throw_error) = @_;
    my $cgi = Bugzilla->cgi;

    $cgi->param('description')
        || ($throw_error ? ThrowUserError("missing_attachment_description") : return 0);

    return 1;
}

=pod

=item C<validate_content_type()>

Description: validates the content type passed in by CGI.

Returns:    1 on success.

=cut

sub validate_content_type {
    my ($class, $throw_error) = @_;
    my $cgi = Bugzilla->cgi;

    if (!defined $cgi->param('contenttypemethod')) {
        $throw_error ? ThrowUserError("missing_content_type_method") : return 0;
    }
    elsif ($cgi->param('contenttypemethod') eq 'autodetect') {
        my $contenttype =
            $cgi->uploadInfo($cgi->param('data'))->{'Content-Type'};
        # The user asked us to auto-detect the content type, so use the type
        # specified in the HTTP request headers.
        if ( !$contenttype ) {
            $throw_error ? ThrowUserError("missing_content_type") : return 0;
        }
        $cgi->param('contenttype', $contenttype);
    }
    elsif ($cgi->param('contenttypemethod') eq 'list') {
        # The user selected a content type from the list, so use their
        # selection.
        $cgi->param('contenttype', $cgi->param('contenttypeselection'));
    }
    elsif ($cgi->param('contenttypemethod') eq 'manual') {
        # The user entered a content type manually, so use their entry.
        $cgi->param('contenttype', $cgi->param('contenttypeentry'));
    }
    else {
        $throw_error ?
            ThrowCodeError("illegal_content_type_method",
                           { contenttypemethod => $cgi->param('contenttypemethod') }) :
            return 0;
    }

    if ( $cgi->param('contenttype') !~
           /^(application|audio|image|message|model|multipart|text|video)\/.+$/ ) {
        $throw_error ?
            ThrowUserError("invalid_content_type",
                           { contenttype => $cgi->param('contenttype') }) :
            return 0;
    }

    return 1;
}

=pod

=item C<validate_can_edit($attachment, $product_id)>

Description: validates if the user is allowed to view and edit the attachment.
             Only the submitter or someone with editbugs privs can edit it.
             Only the submitter and users in the insider group can view
             private attachments.

Params:      $attachment - the attachment object being edited.
             $product_id - the product ID the attachment belongs to.

Returns:     1 on success. Else an error is thrown.

=cut

sub validate_can_edit {
    my ($attachment, $product_id) = @_;
    my $dbh = Bugzilla->dbh;
    my $user = Bugzilla->user;

    # Bug 97729 - the submitter can edit their attachments.
    return if ($attachment->attacher->id == $user->id);

    # Only users in the insider group can view private attachments.
    if ($attachment->isprivate && !$user->is_insider) {
        ThrowUserError('illegal_attachment_edit', {attach_id => $attachment->id});
    }

    # Users with editbugs privs can edit all attachments.
    return if $user->in_group('editbugs', $product_id);

    # If we come here, then this attachment cannot be seen by the user.
    ThrowUserError('illegal_attachment_edit', { attach_id => $attachment->id });
}

=item C<validate_obsolete($bug)>

Description: validates if attachments the user wants to mark as obsolete
             really belong to the given bug and are not already obsolete.
             Moreover, a user cannot mark an attachment as obsolete if
             he cannot view it (due to restrictions on it).

Params:      $bug - The bug object obsolete attachments should belong to.

Returns:     1 on success. Else an error is thrown.

=cut

sub validate_obsolete {
    my ($class, $bug) = @_;
    my $cgi = Bugzilla->cgi;

    # Make sure the attachment id is valid and the user has permissions to view
    # the bug to which it is attached. Make sure also that the user can view
    # the attachment itself.
    my @obsolete_attachments;
    foreach my $attachid ($cgi->param('obsolete')) {
        my $vars = {};
        $vars->{'attach_id'} = $attachid;

        detaint_natural($attachid)
          || ThrowCodeError('invalid_attach_id_to_obsolete', $vars);

        my $attachment = Bugzilla::Attachment->get($attachid);

        # Make sure the attachment exists in the database.
        ThrowUserError('invalid_attach_id', $vars) unless $attachment;

        # Check that the user can view and edit this attachment.
        $attachment->validate_can_edit($bug->product_id);

        $vars->{'description'} = $attachment->description;

        if ($attachment->bug_id != $bug->bug_id) {
            $vars->{'my_bug_id'} = $bug->bug_id;
            $vars->{'attach_bug_id'} = $attachment->bug_id;
            ThrowCodeError('mismatched_bug_ids_on_obsolete', $vars);
        }

        if ($attachment->isobsolete) {
          ThrowCodeError('attachment_already_obsolete', $vars);
        }

        push(@obsolete_attachments, $attachment);
    }
    return @obsolete_attachments;
}


=pod

=item C<insert_attachment_for_bug($throw_error, $bug, $user, $timestamp, $hr_vars)>

Description: inserts an attachment from CGI input for the given bug.

Params:     C<$bug> - Bugzilla::Bug object - the bug for which to insert
            the attachment.
            C<$user> - Bugzilla::User object - the user we're inserting an
            attachment for.
            C<$timestamp> - scalar - timestamp of the insert as returned
            by SELECT NOW().
            C<$hr_vars> - hash reference - reference to a hash of template
            variables.

Returns:    the ID of the new attachment.

=back

=cut

sub insert_attachment_for_bug {
    my ($class, $throw_error, $bug, $user, $timestamp, $hr_vars) = @_;

    my $cgi = Bugzilla->cgi;
    my $dbh = Bugzilla->dbh;
    my $attachurl = $cgi->param('attachurl') || '';
    my $data;
    my $filename;
    my $contenttype;
    my $isurl;
    $class->validate_is_patch($throw_error) || return 0;
    $class->validate_description($throw_error) || return 0;

    if (Bugzilla->params->{'allow_attach_url'}
        && ($attachurl =~ /^(http|https|ftp):\/\/\S+/)
        && !defined $cgi->upload('data'))
    {
        $filename = '';
        $data = $attachurl;
        $isurl = 1;
        $contenttype = 'text/plain';
        $cgi->param('ispatch', 0);
        $cgi->delete('bigfile');
    }
    else {
        $filename = _validate_filename($throw_error) || return 0;
        # need to validate content type before data as
        # we now check the content type for image/bmp in _validate_data()
        unless ($cgi->param('ispatch')) {
            $class->validate_content_type($throw_error) || return 0;
        }
        $data = _validate_data($throw_error, $hr_vars);
        # If the attachment is stored locally, $data eq ''.
        # If an error is thrown, $data eq '0'.
        ($data ne '0') || return 0;
        $contenttype = $cgi->param('contenttype');

        # These are inserted using placeholders so no need to panic
        trick_taint($filename);
        trick_taint($contenttype);
        $isurl = 0;
    }

    # Check attachments the user tries to mark as obsolete.
    my @obsolete_attachments;
    if ($cgi->param('obsolete')) {
        @obsolete_attachments = $class->validate_obsolete($bug);
    }

    # The order of these function calls is important, as Flag::validate
    # assumes User::match_field has ensured that the
    # values in the requestee fields are legitimate user email addresses.
    my $match_status = Bugzilla::User::match_field($cgi, {
        '^requestee(_type)?-(\d+)$' => { 'type' => 'multi' },
    }, MATCH_SKIP_CONFIRM);

    $$hr_vars->{'match_field'} = 'requestee';
    if ($match_status == USER_MATCH_FAILED) {
        $$hr_vars->{'message'} = 'user_match_failed';
    }
    elsif ($match_status == USER_MATCH_MULTIPLE) {
        $$hr_vars->{'message'} = 'user_match_multiple';
    }

    # Escape characters in strings that will be used in SQL statements.
    my $description = $cgi->param('description');
    trick_taint($description);
    my $isprivate = $cgi->param('isprivate') ? 1 : 0;

    # Insert the attachment into the database.
    my $sth = $dbh->do(
        "INSERT INTO attachments
            (bug_id, creation_ts, filename, description,
             mimetype, ispatch, isurl, isprivate, submitter_id)
         VALUES (?,?,?,?,?,?,?,?,?)", undef, ($bug->bug_id, $timestamp, $filename,
              $description, $contenttype, $cgi->param('ispatch'),
              $isurl, $isprivate, $user->id));
    # Retrieve the ID of the newly created attachment record.
    my $attachid = $dbh->bz_last_key('attachments', 'attach_id');

    # We only use $data here in this INSERT with a placeholder,
    # so it's safe.
    $sth = $dbh->prepare("INSERT INTO attach_data
                         (id, thedata) VALUES ($attachid, ?)");
    trick_taint($data);
    $sth->bind_param(1, $data, $dbh->BLOB_TYPE);
    $sth->execute();

    # If the file is to be stored locally, stream the file from the webserver
    # to the local file without reading it into a local variable.
    if ($cgi->param('bigfile')) {
        my $attachdir = bz_locations()->{'attachdir'};
        my $fh = $cgi->upload('data');
        my $hash = ($attachid % 100) + 100;
        $hash =~ s/.*(\d\d)$/group.$1/;
        mkdir "$attachdir/$hash", 0770;
        chmod 0770, "$attachdir/$hash";
        open(AH, ">$attachdir/$hash/attachment.$attachid");
        binmode AH;
        my $sizecount = 0;
        my $limit = (Bugzilla->params->{"maxlocalattachment"} * 1048576);
        while (<$fh>) {
            print AH $_;
            $sizecount += length($_);
            if ($sizecount > $limit) {
                close AH;
                close $fh;
                unlink "$attachdir/$hash/attachment.$attachid";
                $throw_error ? ThrowUserError("local_file_too_large") : return 0;
            }
        }
        close AH;
        close $fh;
    }

    # Make existing attachments obsolete.
    my $fieldid = get_field_id('attachments.isobsolete');

    foreach my $obsolete_attachment (@obsolete_attachments) {
        # If the obsolete attachment has request flags, cancel them.
        # This call must be done before updating the 'attachments' table.
        Bugzilla::Flag::CancelRequests($bug, $obsolete_attachment, $timestamp);

        $dbh->do('UPDATE attachments SET isobsolete = 1 WHERE attach_id = ?',
                 undef, $obsolete_attachment->id);

        $dbh->do('INSERT INTO bugs_activity (bug_id, attach_id, who, bug_when,
                                             fieldid, removed, added)
                       VALUES (?,?,?,?,?,?,?)',
                  undef, ($bug->bug_id, $obsolete_attachment->id, $user->id,
                          $timestamp, $fieldid, 0, 1));
    }

    my $attachment = Bugzilla::Attachment->get($attachid);

    # 1. Add flags, if any. To avoid dying if something goes wrong
    # while processing flags, we will eval() flag validation.
    # This requires errors to die().
    # XXX: this can go away as soon as flag validation is able to
    #      fail without dying.
    #
    # 2. Flag::validate() should not detect any reference to existing flags
    # when creating a new attachment. Setting the third param to -1 will
    # force this function to check this point.
    my $error_mode_cache = Bugzilla->error_mode;
    Bugzilla->error_mode(ERROR_MODE_DIE);
    eval {
        Bugzilla::Flag::validate($cgi, $bug->bug_id, -1);
        Bugzilla::Flag::process($bug, $attachment, $timestamp, $cgi);
    };
    Bugzilla->error_mode($error_mode_cache);
    if ($@) {
        $$hr_vars->{'message'} = 'flag_creation_failed';
        $$hr_vars->{'flag_creation_error'} = $@;
    }

    # Return the ID of the new attachment.
    return $attachid;
}

1;