summaryrefslogtreecommitdiffstats
path: root/Bugzilla/Flag.pm
blob: 8e03284d051009b4a895dd2588e3cbcb1e334ad4 (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
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
# -*- 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): Myk Melez <myk@mozilla.org>
#                 Jouni Heikniemi <jouni@heikniemi.net>
#                 Frédéric Buclin <LpSolit@gmail.com>

=head1 NAME

Bugzilla::Flag - A module to deal with Bugzilla flag values.

=head1 SYNOPSIS

Flag.pm provides an interface to flags as stored in Bugzilla.
See below for more information.

=head1 NOTES

=over

=item *

Prior to calling routines in this module, it's assumed that you have
already done a C<require CGI.pl>.  This will eventually change in a
future version when CGI.pl is removed.

=item *

Import relevant functions from that script and its companion globals.pl.

=item *

Use of private functions / variables outside this module may lead to
unexpected results after an upgrade.  Please avoid usi8ng private
functions in other files/modules.  Private functions are functions
whose names start with _ or a re specifically noted as being private.

=back

=cut

######################################################################
# Module Initialization
######################################################################

# Make it harder for us to do dangerous things in Perl.
use strict;

# This module implements bug and attachment flags.
package Bugzilla::Flag;

use Bugzilla::FlagType;
use Bugzilla::User;
use Bugzilla::Config;
use Bugzilla::Util;
use Bugzilla::Error;
use Bugzilla::Attachment;
use Bugzilla::BugMail;
use Bugzilla::Constants;

use constant TABLES_ALREADY_LOCKED => 1;

# Note that this line doesn't actually import these variables for some reason,
# so I have to use them as $::template and $::vars in the package code.
use vars qw($template $vars); 

######################################################################
# Global Variables
######################################################################

# basic sets of columns and tables for getting flags from the database

=begin private

=head1 PRIVATE VARIABLES/CONSTANTS

=over

=item C<@base_columns>

basic sets of columns and tables for getting flag types from th
database.  B<Used by get, match, sqlify_criteria and perlify_record>

=back

=cut

my @base_columns = 
  ("is_active", "id", "type_id", "bug_id", "attach_id", "requestee_id", 
   "setter_id", "status");

=pod

=item C<@base_tables>

Which database(s) is the data coming from?

Note: when adding tables to @base_tables, make sure to include the separator 
(i.e. a comma or words like "LEFT OUTER JOIN") before the table name, 
since tables take multiple separators based on the join type, and therefore 
it is not possible to join them later using a single known separator.
B<Used by get, match, sqlify_criteria and perlify_record>

=back

=end private

=cut

my @base_tables = ("flags");

######################################################################
# Searching/Retrieving Flags
######################################################################

=head1 PUBLIC FUNCTIONS

=over C<get($id)>

Retrieves and returns a flag from the database.

=cut

# !!! Implement a cache for this function!
sub get {
    my ($id) = @_;

    my $select_clause = "SELECT " . join(", ", @base_columns);
    my $from_clause = "FROM " . join(" ", @base_tables);
    
    # Execute the query, retrieve the result, and write it into a record.
    &::PushGlobalSQLState();
    &::SendSQL("$select_clause $from_clause WHERE flags.id = $id");
    my $flag = perlify_record(&::FetchSQLData());
    &::PopGlobalSQLState();

    return $flag;
}

=pod

=over

=item C<match($criteria)>

Queries the database for flags matching the given criteria
(specified as a hash of field names and their matching values)
and returns an array of matching records.

=back

=cut

sub match {
    my ($criteria) = @_;

    my $select_clause = "SELECT " . join(", ", @base_columns);
    my $from_clause = "FROM " . join(" ", @base_tables);
    
    my @criteria = sqlify_criteria($criteria);
    
    my $where_clause = "WHERE " . join(" AND ", @criteria);
    
    # Execute the query, retrieve the results, and write them into records.
    &::PushGlobalSQLState();
    &::SendSQL("$select_clause $from_clause $where_clause");
    my @flags;
    while (&::MoreSQLData()) {
        my $flag = perlify_record(&::FetchSQLData());
        push(@flags, $flag);
    }
    &::PopGlobalSQLState();

    return \@flags;
}

=pod

=over

=item C<count($criteria)>

Queries the database for flags matching the given criteria 
(specified as a hash of field names and their matching values)
and returns an array of matching records.

=back

=cut

sub count {
    my ($criteria) = @_;

    my @criteria = sqlify_criteria($criteria);
    
    my $where_clause = "WHERE " . join(" AND ", @criteria);
    
    # Execute the query, retrieve the result, and write it into a record.
    &::PushGlobalSQLState();
    &::SendSQL("SELECT COUNT(id) FROM flags $where_clause");
    my $count = &::FetchOneColumn();
    &::PopGlobalSQLState();

    return $count;
}

######################################################################
# Creating and Modifying
######################################################################

=pod

=over

=item C<validate($cgi, $bug_id)>

Validates fields containing flag modifications.

=back

=cut

sub validate {
    my $user = Bugzilla->user;
    my ($cgi, $bug_id) = @_;
  
    # Get a list of flags to validate.  Uses the "map" function
    # to extract flag IDs from form field names by matching fields
    # whose name looks like "flag-nnn", where "nnn" is the ID,
    # and returning just the ID portion of matching field names.
    my @ids = map(/^flag-(\d+)$/ ? $1 : (), $cgi->param());
  
    foreach my $id (@ids)
    {
        my $status = $cgi->param("flag-$id");
        
        # Make sure the flag exists.
        my $flag = get($id);
        $flag || ThrowCodeError("flag_nonexistent", { id => $id });

        # Note that the deletedness of the flag (is_active or not) is not 
        # checked here; we do want to allow changes to deleted flags in
        # certain cases. Flag::modify() will revive the modified flags.
        # See bug 223878 for details.

        # Make sure the user chose a valid status.
        grep($status eq $_, qw(X + - ?))
          || ThrowCodeError("flag_status_invalid", 
                            { id => $id, status => $status });
                
        # Make sure the user didn't request the flag unless it's requestable.
        # If the flag was requested before it became unrequestable, leave it as is.
        if ($status eq '?' && $flag->{status} ne '?' && 
            !$flag->{type}->{is_requestable}) {
            ThrowCodeError("flag_status_invalid", 
                           { id => $id, status => $status });
        }
        
        # Make sure the requestee is authorized to access the bug.
        # (and attachment, if this installation is using the "insider group"
        # feature and the attachment is marked private).
        if ($status eq '?'
            && $flag->{type}->{is_requesteeble}
            && trim($cgi->param("requestee-$id")))
        {
            my $requestee_email = trim($cgi->param("requestee-$id"));
            my $old_requestee = 
              $flag->{'requestee'} ? $flag->{'requestee'}->login : '';

            if ($old_requestee ne $requestee_email) {
                # We know the requestee exists because we ran
                # Bugzilla::User::match_field before getting here.
                my $requestee = Bugzilla::User->new_from_login($requestee_email);

                # Throw an error if the user can't see the bug.
                if (!$requestee->can_see_bug($bug_id))
                {
                    ThrowUserError("flag_requestee_unauthorized",
                                   { flag_type => $flag->{'type'},
                                     requestee => $requestee,
                                     bug_id => $bug_id,
                                     attach_id =>
                                       $flag->{target}->{attachment}->{id} });
                }

                # Throw an error if the target is a private attachment and
                # the requestee isn't in the group of insiders who can see it.
                if ($flag->{target}->{attachment}->{exists}
                    && $cgi->param('isprivate')
                    && Param("insidergroup")
                    && !$requestee->in_group(Param("insidergroup")))
                {
                    ThrowUserError("flag_requestee_unauthorized_attachment",
                                   { flag_type => $flag->{'type'},
                                     requestee => $requestee,
                                     bug_id    => $bug_id,
                                     attach_id =>
                                      $flag->{target}->{attachment}->{id} });
                }
            }
        }

        # Make sure the user is authorized to modify flags, see bug 180879
        # - The flag is unchanged
        next if ($status eq $flag->{status});

        # - User in the $request_gid group can clear pending requests and set flags
        #   and can rerequest set flags.
        next if (($status eq 'X' || $status eq '?')
                 && (!$flag->{type}->{request_gid}
                     || $user->in_group(&::GroupIdToName($flag->{type}->{request_gid}))));

        # - User in the $grant_gid group can set/clear flags,
        #   including "+" and "-"
        next if (!$flag->{type}->{grant_gid}
                 || $user->in_group(&::GroupIdToName($flag->{type}->{grant_gid})));

        # - Any other flag modification is denied
        ThrowUserError("flag_update_denied",
                        { name       => $flag->{type}->{name},
                          status     => $status,
                          old_status => $flag->{status} });
    }
}

sub snapshot {
    my ($bug_id, $attach_id) = @_;

    my $flags = match({ 'bug_id'    => $bug_id,
                        'attach_id' => $attach_id,
                        'is_active' => 1 });
    my @summaries;
    foreach my $flag (@$flags) {
        my $summary = $flag->{'type'}->{'name'} . $flag->{'status'};
        $summary .= "(" . $flag->{'requestee'}->login . ")" if $flag->{'requestee'};
        push(@summaries, $summary);
    }
    return @summaries;
}


=pod

=over

=item C<process($target, $timestamp, $cgi)>

Processes changes to flags.

The target is the bug or attachment this flag is about, the timestamp
is the date/time the bug was last touched (so that changes to the flag
can be stamped with the same date/time), the cgi is the CGI object
used to obtain the flag fields that the user submitted.

=back

=cut

sub process {
    my ($target, $timestamp, $cgi) = @_;

    my $dbh = Bugzilla->dbh;
    my $bug_id = $target->{'bug'}->{'id'};
    my $attach_id = $target->{'attachment'}->{'id'};

    # Use the date/time we were given if possible (allowing calling code
    # to synchronize the comment's timestamp with those of other records).
    $timestamp = ($timestamp ? &::SqlQuote($timestamp) : "NOW()");
    
    # Take a snapshot of flags before any changes.
    my @old_summaries = snapshot($bug_id, $attach_id);
    
    # Cancel pending requests if we are obsoleting an attachment.
    if ($attach_id && $cgi->param('isobsolete')) {
        CancelRequests($bug_id, $attach_id);
    }

    # Create new flags and update existing flags.
    my $new_flags = FormToNewFlags($target, $cgi);
    foreach my $flag (@$new_flags) { create($flag, $timestamp) }
    modify($cgi, $timestamp);
    
    # In case the bug's product/component has changed, clear flags that are
    # no longer valid.
    my $flag_ids = $dbh->selectcol_arrayref(
        "SELECT flags.id 
        FROM (flags INNER JOIN bugs ON flags.bug_id = bugs.bug_id)
          LEFT OUTER JOIN flaginclusions i
            ON (flags.type_id = i.type_id 
            AND (bugs.product_id = i.product_id OR i.product_id IS NULL)
            AND (bugs.component_id = i.component_id OR i.component_id IS NULL))
        WHERE bugs.bug_id = ?
        AND flags.is_active = 1
        AND i.type_id IS NULL",
        undef, $bug_id);

    foreach my $flag_id (@$flag_ids) { clear($flag_id) }

    $flag_ids = $dbh->selectcol_arrayref(
        "SELECT flags.id 
        FROM flags, bugs, flagexclusions e
        WHERE bugs.bug_id = ?
        AND flags.bug_id = bugs.bug_id
        AND flags.type_id = e.type_id
        AND flags.is_active = 1 
        AND (bugs.product_id = e.product_id OR e.product_id IS NULL)
        AND (bugs.component_id = e.component_id OR e.component_id IS NULL)",
        undef, $bug_id);

    foreach my $flag_id (@$flag_ids) { clear($flag_id) }

    # Take a snapshot of flags after changes.
    my @new_summaries = snapshot($bug_id, $attach_id);

    update_activity($bug_id, $attach_id, $timestamp, \@old_summaries, \@new_summaries);
}

sub update_activity {
    my ($bug_id, $attach_id, $timestamp, $old_summaries, $new_summaries) = @_;
    my $dbh = Bugzilla->dbh;

    $attach_id ||= 'NULL';
    $old_summaries = join(", ", @$old_summaries);
    $new_summaries = join(", ", @$new_summaries);
    my ($removed, $added) = diff_strings($old_summaries, $new_summaries);
    if ($removed ne $added) {
        my $sql_removed = &::SqlQuote($removed);
        my $sql_added = &::SqlQuote($added);
        my $field_id = &::GetFieldID('flagtypes.name');
        $dbh->do("INSERT INTO bugs_activity
                  (bug_id, attach_id, who, bug_when, fieldid, removed, added)
                  VALUES ($bug_id, $attach_id, $::userid, $timestamp,
                  $field_id, $sql_removed, $sql_added)");
    }
}

=pod

=over

=item C<create($flag, $timestamp)>

Creates a flag record in the database.

=back

=cut

sub create {
    my ($flag, $timestamp) = @_;

    # Determine the ID for the flag record by retrieving the last ID used
    # and incrementing it.
    &::SendSQL("SELECT MAX(id) FROM flags");
    $flag->{'id'} = (&::FetchOneColumn() || 0) + 1;
    
    # Insert a record for the flag into the flags table.
    my $attach_id = $flag->{'target'}->{'attachment'}->{'id'} || "NULL";
    my $requestee_id = $flag->{'requestee'} ? $flag->{'requestee'}->id : "NULL";
    &::SendSQL("INSERT INTO flags (id, type_id, 
                                      bug_id, attach_id, 
                                      requestee_id, setter_id, status, 
                                      creation_date, modification_date)
                VALUES ($flag->{'id'}, 
                        $flag->{'type'}->{'id'}, 
                        $flag->{'target'}->{'bug'}->{'id'}, 
                        $attach_id,
                        $requestee_id,
                        " . $flag->{'setter'}->id . ",
                        '$flag->{'status'}', 
                        $timestamp,
                        $timestamp)");
    
    # Send an email notifying the relevant parties about the flag creation.
    if (($flag->{'requestee'} 
         && $flag->{'requestee'}->wants_mail([EVT_FLAG_REQUESTED]))
         || $flag->{'type'}->{'cc_list'})
    {
        notify($flag, "request/email.txt.tmpl");
    }
}

=pod

=over

=item C<migrate($old_attach_id, $new_attach_id, $timestamp)>

Moves a flag from one attachment to another.  Useful for migrating
a flag from an obsolete attachment to the attachment that obsoleted it.

=back

=cut

sub migrate {
    my ($old_attach_id, $new_attach_id, $timestamp) = @_;

    # Use the date/time we were given if possible (allowing calling code
    # to synchronize the comment's timestamp with those of other records).
    $timestamp = ($timestamp ? &::SqlQuote($timestamp) : "NOW()");

    # Update the record in the flags table to point to the new attachment.
    &::SendSQL("UPDATE flags " . 
               "SET    attach_id = $new_attach_id , " . 
               "       modification_date = $timestamp " . 
               "WHERE  attach_id = $old_attach_id");
}

=pod

=over

=item C<modify($cgi, $timestamp)>

Modifies flags in the database when a user changes them.
Note that modified flags are always set active (is_active = 1) -
this will revive deleted flags that get changed through 
attachment.cgi midairs. See bug 223878 for details.

=back

=cut

sub modify {
    my ($cgi, $timestamp) = @_;

    # Use the date/time we were given if possible (allowing calling code
    # to synchronize the comment's timestamp with those of other records).
    $timestamp = ($timestamp ? &::SqlQuote($timestamp) : "NOW()");
    
    # Extract a list of flags from the form data.
    my @ids = map(/^flag-(\d+)$/ ? $1 : (), $cgi->param());
    
    # Loop over flags and update their record in the database if necessary.
    # Two kinds of changes can happen to a flag: it can be set to a different
    # state, and someone else can be asked to set it.  We take care of both
    # those changes.
    my @flags;
    foreach my $id (@ids) {
        my $flag = get($id);

        my $status = $cgi->param("flag-$id");
        my $requestee_email = trim($cgi->param("requestee-$id") || '');

        
        # Ignore flags the user didn't change. There are two components here:
        # either the status changes (trivial) or the requestee changes.
        # Change of either field will cause full update of the flag.

        my $status_changed = ($status ne $flag->{'status'});
        
        # Requestee is considered changed, if all of the following apply:
        # 1. Flag status is '?' (requested)
        # 2. Flag can have a requestee
        # 3. The requestee specified on the form is different from the 
        #    requestee specified in the db.
        
        my $old_requestee = 
          $flag->{'requestee'} ? $flag->{'requestee'}->login : '';

        my $requestee_changed = 
          ($status eq "?" && 
           $flag->{'type'}->{'is_requesteeble'} &&
           $old_requestee ne $requestee_email);
           
        next unless ($status_changed || $requestee_changed);

        
        # Since the status is validated, we know it's safe, but it's still
        # tainted, so we have to detaint it before using it in a query.
        &::trick_taint($status);
        
        if ($status eq '+' || $status eq '-') {
            &::SendSQL("UPDATE flags 
                        SET    setter_id = $::userid , 
                               requestee_id = NULL , 
                               status = '$status' , 
                               modification_date = $timestamp ,
                               is_active = 1
                        WHERE  id = $flag->{'id'}");
            
            # Send an email notifying the relevant parties about the fulfillment.
            if ($flag->{'setter'}->wants_mail([EVT_REQUESTED_FLAG]) 
                || $flag->{'type'}->{'cc_list'})
            {
                $flag->{'status'} = $status;
                notify($flag, "request/email.txt.tmpl");
            }
        }
        elsif ($status eq '?') {
            # Get the requestee, if any.
            my $requestee_id = "NULL";
            if ($requestee_email) {
                $requestee_id = login_to_id($requestee_email);
                $flag->{'requestee'} = new Bugzilla::User($requestee_id);
            }

            # Update the database with the changes.
            &::SendSQL("UPDATE flags 
                        SET    setter_id = $::userid , 
                               requestee_id = $requestee_id , 
                               status = '$status' , 
                               modification_date = $timestamp ,
                               is_active = 1
                        WHERE  id = $flag->{'id'}");
            
            # Send an email notifying the relevant parties about the request.
            if ($flag->{'requestee'} 
                && ($flag->{'requestee'}->wants_mail([EVT_FLAG_REQUESTED]) 
                    || $flag->{'type'}->{'cc_list'}))
            {
                notify($flag, "request/email.txt.tmpl");
            }
        }
        # The user unset the flag; set is_active = 0
        elsif ($status eq 'X') {
            clear($flag->{'id'});
        }
        
        push(@flags, $flag);
    }
    
    return \@flags;
}

=pod

=over

=item C<clear($id)>

Deactivate a flag.

=back

=cut

sub clear {
    my ($id) = @_;
    
    my $flag = get($id);
    
    &::PushGlobalSQLState();
    &::SendSQL("UPDATE flags SET is_active = 0 WHERE id = $id");
    &::PopGlobalSQLState();

    $flag->{'exists'} = 0;    
    # Set the flag's status to "cleared" so the email template
    # knows why email is being sent about the request.
    $flag->{'status'} = "X";
    
    notify($flag, "request/email.txt.tmpl") if $flag->{'requestee'};
}


######################################################################
# Utility Functions
######################################################################

=pod

=over

=item C<FormToNewFlags($target, $cgi)

Someone pleasedocument this function.

=back

=cut

sub FormToNewFlags {
    my ($target, $cgi) = @_;
    
    # Get information about the setter to add to each flag.
    # Uses a conditional to suppress Perl's "used only once" warnings.
    my $setter = new Bugzilla::User($::userid);

    # Extract a list of flag type IDs from field names.
    my @type_ids = map(/^flag_type-(\d+)$/ ? $1 : (), $cgi->param());
    @type_ids = grep($cgi->param("flag_type-$_") ne 'X', @type_ids);
    
    # Process the form data and create an array of flag objects.
    my @flags;
    foreach my $type_id (@type_ids) {
        my $status = $cgi->param("flag_type-$type_id");
        &::trick_taint($status);
    
        # Create the flag record and populate it with data from the form.
        my $flag = { 
            type   => Bugzilla::FlagType::get($type_id) , 
            target => $target , 
            setter => $setter , 
            status => $status 
        };

        if ($status eq "?") {
            my $requestee = $cgi->param("requestee_type-$type_id");
            if ($requestee) {
                my $requestee_id = login_to_id($requestee);
                $flag->{'requestee'} = new Bugzilla::User($requestee_id);
            }
        }
        
        # Add the flag to the array of flags.
        push(@flags, $flag);
    }

    # Return the list of flags.
    return \@flags;
}

=pod

=over

=item C<GetBug($id)>

Returns a hash of information about a target bug.

=back

=cut

# Ideally, we'd use Bug.pm, but it's way too heavyweight, and it can't be
# made lighter without totally rewriting it, so we'll use this function
# until that one gets rewritten.
sub GetBug {
    my ($id) = @_;

    my $dbh = Bugzilla->dbh;

    # Save the currently running query (if any) so we do not overwrite it.
    &::PushGlobalSQLState();

    &::SendSQL("SELECT    1, short_desc, product_id, component_id,
                          COUNT(bug_group_map.group_id)
                FROM      bugs LEFT JOIN bug_group_map
                            ON (bugs.bug_id = bug_group_map.bug_id)
                WHERE     bugs.bug_id = $id " .
                $dbh->sql_group_by('bugs.bug_id',
                                   'short_desc, product_id, component_id'));

    my $bug = { 'id' => $id };
    
    ($bug->{'exists'}, $bug->{'summary'}, $bug->{'product_id'}, 
     $bug->{'component_id'}, $bug->{'restricted'}) = &::FetchSQLData();

    # Restore the previously running query (if any).
    &::PopGlobalSQLState();

    return $bug;
}

=pod

=over

=item C<GetTarget($bug_id, $attach_id)>

Someone please document this function.

=back

=cut

sub GetTarget {
    my ($bug_id, $attach_id) = @_;
    
    # Create an object representing the target bug/attachment.
    my $target = { 'exists' => 0 };

    if ($attach_id) {
        $target->{'attachment'} = new Bugzilla::Attachment($attach_id);
        if ($bug_id) {
            # Make sure the bug and attachment IDs correspond to each other
            # (i.e. this is the bug to which this attachment is attached).
            $bug_id == $target->{'attachment'}->{'bug_id'}
              || return { 'exists' => 0 };
        }
        $target->{'bug'} = GetBug($target->{'attachment'}->{'bug_id'});
        $target->{'exists'} = $target->{'attachment'}->{'exists'};
        $target->{'type'} = "attachment";
    }
    elsif ($bug_id) {
        $target->{'bug'} = GetBug($bug_id);
        $target->{'exists'} = $target->{'bug'}->{'exists'};
        $target->{'type'} = "bug";
    }

    return $target;
}

=pod

=over

=item C<notify($flag, $template_file)>

Sends an email notification about a flag being created or fulfilled.

=back

=cut

sub notify {
    my ($flag, $template_file) = @_;

    # If the target bug is restricted to one or more groups, then we need
    # to make sure we don't send email about it to unauthorized users
    # on the request type's CC: list, so we have to trawl the list for users
    # not in those groups or email addresses that don't have an account.
    if ($flag->{'target'}->{'bug'}->{'restricted'}
        || $flag->{'target'}->{'attachment'}->{'isprivate'})
    {
        my @new_cc_list;
        foreach my $cc (split(/[, ]+/, $flag->{'type'}->{'cc_list'})) {
            my $ccuser = Bugzilla::User->new_from_login($cc,
                                                        TABLES_ALREADY_LOCKED)
              || next;

            next if $flag->{'target'}->{'bug'}->{'restricted'}
              && !$ccuser->can_see_bug($flag->{'target'}->{'bug'}->{'id'});
            next if $flag->{'target'}->{'attachment'}->{'isprivate'}
              && Param("insidergroup")
              && !$ccuser->in_group(Param("insidergroup"));
            push(@new_cc_list, $cc);
        }
        $flag->{'type'}->{'cc_list'} = join(", ", @new_cc_list);
    }

    $flag->{'requestee'}->{'email'} .= Param('emailsuffix');
    $flag->{'setter'}->{'email'} .= Param('emailsuffix');
    $::vars->{'flag'} = $flag;
    
    my $message;
    my $rv = 
      $::template->process($template_file, $::vars, \$message);
    if (!$rv) {
        Bugzilla->cgi->header();
        ThrowTemplateError($::template->error());
    }

    Bugzilla::BugMail::MessageToMTA($message);
}

# Cancel all request flags from the attachment being obsoleted.
sub CancelRequests {
    my ($bug_id, $attach_id, $timestamp) = @_;
    my $dbh = Bugzilla->dbh;

    my $request_ids =
        $dbh->selectcol_arrayref("SELECT flags.id
                                  FROM flags
                                  LEFT JOIN attachments ON flags.attach_id = attachments.attach_id
                                  WHERE flags.attach_id = ?
                                  AND flags.status = '?'
                                  AND flags.is_active = 1
                                  AND attachments.isobsolete = 0",
                                  undef, $attach_id);

    return if (!scalar(@$request_ids));

    # Take a snapshot of flags before any changes.
    my @old_summaries = snapshot($bug_id, $attach_id) if ($timestamp);
    foreach my $flag (@$request_ids) { clear($flag) }

    # If $timestamp is undefined, do not update the activity table
    return unless ($timestamp);

    # Take a snapshot of flags after any changes.
    my @new_summaries = snapshot($bug_id, $attach_id);
    update_activity($bug_id, $attach_id, $timestamp, \@old_summaries, \@new_summaries);
}

######################################################################
# Private Functions
######################################################################

=begin private

=head1 PRIVATE FUNCTIONS

=over

=item C<sqlify_criteria($criteria)>

Converts a hash of criteria into a list of SQL criteria.

=back

=cut

sub sqlify_criteria {
    # a reference to a hash containing the criteria (field => value)
    my ($criteria) = @_;

    # the generated list of SQL criteria; "1=1" is a clever way of making sure
    # there's something in the list so calling code doesn't have to check list
    # size before building a WHERE clause out of it
    my @criteria = ("1=1");
    
    # If the caller specified only bug or attachment flags,
    # limit the query to those kinds of flags.
    if (defined($criteria->{'target_type'})) {
        if    ($criteria->{'target_type'} eq 'bug')        { push(@criteria, "attach_id IS NULL") }
        elsif ($criteria->{'target_type'} eq 'attachment') { push(@criteria, "attach_id IS NOT NULL") }
    }
    
    # Go through each criterion from the calling code and add it to the query.
    foreach my $field (keys %$criteria) {
        my $value = $criteria->{$field};
        next unless defined($value);
        if    ($field eq 'type_id')      { push(@criteria, "type_id      = $value") }
        elsif ($field eq 'bug_id')       { push(@criteria, "bug_id       = $value") }
        elsif ($field eq 'attach_id')    { push(@criteria, "attach_id    = $value") }
        elsif ($field eq 'requestee_id') { push(@criteria, "requestee_id = $value") }
        elsif ($field eq 'setter_id')    { push(@criteria, "setter_id    = $value") }
        elsif ($field eq 'status')       { push(@criteria, "status       = '$value'") }
        elsif ($field eq 'is_active')    { push(@criteria, "is_active    = $value") }
    }
    
    return @criteria;
}

=pod

=over

=item C<perlify_record($exists, $id, $type_id, $bug_id, $attach_id, $requestee_id, $setter_id, $status)>

Converts a row from the database into a Perl record.

=back

=cut

sub perlify_record {
    my ($exists, $id, $type_id, $bug_id, $attach_id, 
        $requestee_id, $setter_id, $status) = @_;
    
    return undef unless defined($exists);
    
    my $flag =
      {
        exists    => $exists , 
        id        => $id ,
        type      => Bugzilla::FlagType::get($type_id) ,
        target    => GetTarget($bug_id, $attach_id) , 
        requestee => $requestee_id ? new Bugzilla::User($requestee_id) : undef,
        setter    => new Bugzilla::User($setter_id) ,
        status    => $status , 
      };
    
    return $flag;
}

=end private

=head1 SEE ALSO

=over

=item B<Bugzilla::FlagType>

=back

=head1 CONTRIBUTORS

=over

=item Myk Melez <myk@mozilla.org>

=item Jouni Heikniemi <jouni@heikniemi.net>

=item Kevin Benton <kevin.benton@amd.com>

=back

=cut

1;