summaryrefslogtreecommitdiffstats
path: root/Bugzilla/User.pm
blob: 8396d183f28a95b2c9e54fd565b1ee94ce62306e (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
# -*- 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>
#                 Erik Stambaugh <erik@dasbistro.com>
#                 Bradley Baetz <bbaetz@acm.org>
#                 Joel Peshkin <bugreport@peshkin.net> 

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

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

# This module implements utilities for dealing with Bugzilla users.
package Bugzilla::User;

use Bugzilla::Config;
use Bugzilla::Error;
use Bugzilla::Util;
use Bugzilla::Constants;

################################################################################
# Functions
################################################################################

sub new {
    my $invocant = shift;
    if (scalar @_ == 0) {
        return $invocant->_create;
    }
    return $invocant->_create("userid=?", @_);
}

# This routine is sort of evil. Nothing except the login stuff should
# be dealing with addresses as an input, and they can get the id as a
# side effect of the other sql they have to do anyway.
# Bugzilla::BugMail still does this, probably as a left over from the
# pre-id days. Provide this as a helper, but don't document it, and hope
# that it can go away.
# The request flag stuff also does this, but it really should be passing
# in the id its already had to validate (or the User.pm object, of course)
sub new_from_login {
    my $invocant = shift;
    return $invocant->_create("login_name=?", @_);
}

# Internal helper for the above |new| methods
# $cond is a string (including a placeholder ?) for the search
# requirement for the profiles table
sub _create {
    my $invocant = shift;
    my $class = ref($invocant) || $invocant;

    my $cond = shift;
    my $val = shift;

    # Allow invocation with no parameters to create a blank object
    my $self = {
        'id'             => 0,
        'name'           => '',
        'login'          => '',
        'showmybugslink' => 0,
    };
    bless ($self, $class);
    return $self unless $cond;

    # We're checking for validity here, so any value is OK
    trick_taint($val);

    my $tables_locked_for_derive_groups = shift;

    my $dbh = Bugzilla->dbh;

    my ($id,
        $login,
        $name,
        $mybugslink) = $dbh->selectrow_array(qq{SELECT userid,
                                                       login_name,
                                                       realname,
                                                       mybugslink
                                                  FROM profiles
                                                 WHERE $cond},
                                             undef,
                                             $val);

    return undef unless defined $id;

    $self->{'id'}             = $id;
    $self->{'name'}           = $name;
    $self->{'login'}          = $login;
    $self->{'showmybugslink'} = $mybugslink;

    # Now update any old group information if needed
    my $result = $dbh->selectrow_array(q{SELECT 1
                                           FROM profiles, groups
                                          WHERE userid=?
                                            AND profiles.refreshed_when <=
                                                  groups.last_changed},
                                       undef,
                                       $id);

    if ($result) {
        my $is_main_db;
        unless ($is_main_db = Bugzilla->dbwritesallowed()) {
            Bugzilla->switch_to_main_db();
        }
        $self->derive_groups($tables_locked_for_derive_groups);
        unless ($is_main_db) {
            Bugzilla->switch_to_shadow_db();
        }
    }

    return $self;
}

# Accessors for user attributes
sub id { $_[0]->{id}; }
sub login { $_[0]->{login}; }
sub email { $_[0]->{login}; }
sub name { $_[0]->{name}; }
sub showmybugslink { $_[0]->{showmybugslink}; }

# Generate a string to identify the user by name + email if the user
# has a name or by email only if she doesn't.
sub identity {
    my $self = shift;

    return "" unless $self->id;

    if (!defined $self->{identity}) {
        $self->{identity} = 
          $self->{name} ? "$self->{name} <$self->{login}>" : $self->{login};
    }

    return $self->{identity};
}

sub nick {
    my $self = shift;

    return "" unless $self->id;

    if (!defined $self->{nick}) {
        $self->{nick} = (split(/@/, $self->{login}, 2))[0];
    }

    return $self->{nick};
}

sub queries {
    my $self = shift;

    return $self->{queries} if defined $self->{queries};
    return [] unless $self->id;

    my $dbh = Bugzilla->dbh;
    my $sth = $dbh->prepare(q{  SELECT name, query, linkinfooter
                                  FROM namedqueries
                                 WHERE userid=?
                              ORDER BY UPPER(name)});
    $sth->execute($self->{id});

    my @queries;
    while (my $row = $sth->fetch) {
        push (@queries, {
                          name         => $row->[0],
                          query        => $row->[1],
                          linkinfooter => $row->[2],
                        });
    }
    $self->{queries} = \@queries;

    return $self->{queries};
}

sub flush_queries_cache {
    my $self = shift;

    delete $self->{queries};
}

sub groups {
    my $self = shift;

    return $self->{groups} if defined $self->{groups};
    return {} unless $self->id;

    my $dbh = Bugzilla->dbh;
    my $groups = $dbh->selectcol_arrayref(q{SELECT DISTINCT groups.name, group_id
                                              FROM groups, user_group_map
                                             WHERE groups.id=user_group_map.group_id
                                               AND user_id=?
                                               AND isbless=0},
                                          { Columns=>[1,2] },
                                          $self->{id});

    # The above gives us an arrayref [name, id, name, id, ...]
    # Convert that into a hashref
    my %groups = @$groups;
    $self->{groups} = \%groups;

    return $self->{groups};
}

sub in_group {
    my ($self, $group) = @_;

    # If we already have the info, just return it.
    return defined($self->{groups}->{$group}) if defined $self->{groups};
    return 0 unless $self->id;

    # Otherwise, go check for it

    my $dbh = Bugzilla->dbh;

    my ($res) = $dbh->selectrow_array(q{SELECT 1
                                  FROM groups, user_group_map
                                 WHERE groups.id=user_group_map.group_id
                                   AND user_group_map.user_id=?
                                   AND isbless=0
                                   AND groups.name=?},
                              undef,
                              $self->id,
                              $group);

    return defined($res);
}

# visible_groups_inherited returns a reference to a list of all the groups
# whose members are visible to this user.
sub visible_groups_inherited {
    my $self = shift;
    return $self->{visible_groups_inherited} if defined $self->{visible_groups_inherited};
    return [] unless $self->id;
    my @visgroups = @{$self->visible_groups_direct};
    @visgroups = flatten_group_membership(@visgroups);
    $self->{visible_groups_inherited} = \@visgroups;
    return $self->{visible_groups_inherited};
}

# visible_groups_direct returns a reference to a list of all the groups that
# are visible to this user.
sub visible_groups_direct {
    my $self = shift;
    my @visgroups = ();
    return $self->{visible_groups_direct} if defined $self->{visible_groups_direct};
    return [] unless $self->id;

    my $dbh = Bugzilla->dbh;
    my $glist = join(',',(-1,values(%{$self->groups})));
    my $sth = $dbh->prepare("SELECT DISTINCT grantor_id
                                FROM group_group_map
                               WHERE member_id IN($glist)
                                 AND grant_type=" . GROUP_VISIBLE);
    $sth->execute();

    while (my ($row) = $sth->fetchrow_array) {
        push @visgroups,$row;
    }
    $self->{visible_groups_direct} = \@visgroups;

    return $self->{visible_groups_direct};
}

sub derive_groups {
    my ($self, $already_locked) = @_;

    my $id = $self->id;
    return unless $id;

    my $dbh = Bugzilla->dbh;

    my $sth;

    $dbh->do(q{LOCK TABLES profiles WRITE,
                           user_group_map WRITE,
                           group_group_map READ,
                           groups READ}) unless $already_locked;

    # avoid races, we are only up to date as of the BEGINNING of this process
    my $time = $dbh->selectrow_array("SELECT NOW()");

    # first remove any old derived stuff for this user
    $dbh->do(q{DELETE FROM user_group_map
                      WHERE user_id = ?
                        AND grant_type != ?},
             undef,
             $id,
             GRANT_DIRECT);

    my %groupidsadded = ();
    # add derived records for any matching regexps

    $sth = $dbh->prepare("SELECT id, userregexp FROM groups WHERE userregexp != ''");
    $sth->execute;

    my $group_insert;
    while (my $row = $sth->fetch) {
        if ($self->{login} =~ m/$row->[1]/i) {
            $group_insert ||= $dbh->prepare(q{INSERT INTO user_group_map
                                              (user_id, group_id, isbless, grant_type)
                                              VALUES (?, ?, 0, ?)});
            $groupidsadded{$row->[0]} = 1;
            $group_insert->execute($id, $row->[0], GRANT_REGEXP);
        }
    }

    # Get a list of the groups of which the user is a member.
    my %groupidschecked = ();

    my @groupidstocheck = @{$dbh->selectcol_arrayref(q{SELECT group_id
                                                         FROM user_group_map
                                                        WHERE user_id=?},
                                                     undef,
                                                     $id)};

    # Each group needs to be checked for inherited memberships once.
    my $group_sth;
    while (@groupidstocheck) {
        my $group = shift @groupidstocheck;
        if (!defined($groupidschecked{"$group"})) {
            $groupidschecked{"$group"} = 1;
            $group_sth ||= $dbh->prepare(q{SELECT grantor_id
                                             FROM group_group_map
                                            WHERE member_id=?
                                              AND grant_type=' . 
                                                  GROUP_MEMBERSHIP . '});
            $group_sth->execute($group);
            while (my ($groupid) = $group_sth->fetchrow_array) {
                if (!defined($groupidschecked{"$groupid"})) {
                    push(@groupidstocheck,$groupid);
                }
                if (!$groupidsadded{$groupid}) {
                    $groupidsadded{$groupid} = 1;
                    $group_insert ||= $dbh->prepare(q{INSERT INTO user_group_map
                                                      (user_id, group_id, isbless, grant_type)
                                                      VALUES (?, ?, 0, ?)});
                    $group_insert->execute($id, $groupid, GRANT_DERIVED);
                }
            }
        }
    }

    $dbh->do(q{UPDATE profiles
                  SET refreshed_when = ?
                WHERE userid=?},
             undef,
             $time,
             $id);
    $dbh->do("UNLOCK TABLES") unless $already_locked;
}

sub can_bless {
    my $self = shift;

    return $self->{can_bless} if defined $self->{can_bless};
    return 0 unless $self->id;

    my $dbh = Bugzilla->dbh;
    # First check if the user can explicitly bless a group
    my $res = $dbh->selectrow_arrayref(q{SELECT 1
                                           FROM user_group_map
                                          WHERE user_id=?
                                            AND isbless=1},
                                       undef,
                                       $self->{id});
    if (!$res) {
        # Now check if user is a member of a group that can bless a group
        $res = $dbh->selectrow_arrayref(q{SELECT 1
                                            FROM user_group_map, group_group_map
                                           WHERE user_group_map.user_id=?
                                             AND user_group_map.group_id=member_id
                                             AND group_group_map.grant_type=} .
                                                 GROUP_BLESS,
                                        undef,
                                        $self->{id});
    }

    $self->{can_bless} = $res ? 1 : 0;

    return $self->{can_bless};
}

sub flatten_group_membership {
    my (@groups) = @_;

    my $dbh = Bugzilla->dbh;
    my $sth;
    my @groupidstocheck = @groups;
    my %groupidschecked = ();
    $sth = $dbh->prepare("SELECT member_id FROM group_group_map
                             WHERE grantor_id = ? 
                               AND grant_type = " . GROUP_MEMBERSHIP);
    while (my $node = shift @groupidstocheck) {
        $sth->execute($node);
        my $member;
        while (($member) = $sth->fetchrow_array) {
            if (!$groupidschecked{$member}) {
                $groupidschecked{$member} = 1;
                push @groupidstocheck, $member;
                push @groups, $member unless grep $_ == $member, @groups;
            }
        }
    }
    return @groups;
}

sub match {
    # Generates a list of users whose login name (email address) or real name
    # matches a substring or wildcard.
    # This is also called if matches are disabled (for error checking), but
    # in this case only the exact match code will end up running.

    # $str contains the string to match, while $limit contains the
    # maximum number of records to retrieve.
    my ($str, $limit, $exclude_disabled) = @_;
    
    my @users = ();

    return \@users if $str =~ /^\s*$/;

    # The search order is wildcards, then exact match, then substring search.
    # Wildcard matching is skipped if there is no '*', and exact matches will
    # not (?) have a '*' in them.  If any search comes up with something, the
    # ones following it will not execute.

    # first try wildcards

    my $wildstr = $str;
    my $user = Bugzilla->user;

    if ($wildstr =~ s/\*/\%/g && # don't do wildcards if no '*' in the string
        Param('usermatchmode') ne 'off') { # or if we only want exact matches

        # Build the query.
        my $sqlstr = &::SqlQuote($wildstr);
        my $query  = "SELECT DISTINCT userid, realname, login_name " .
                     "FROM profiles ";
        if (&::Param('usevisibilitygroups')) {
            $query .= ", user_group_map ";
        }
        $query    .= "WHERE (login_name LIKE $sqlstr " .
                     "OR realname LIKE $sqlstr) ";
        if (&::Param('usevisibilitygroups')) {
            $query .= "AND user_group_map.user_id = userid " .
                      "AND isbless = 0 " .
                      "AND group_id IN(" .
                      join(', ', (-1, @{$user->visible_groups_inherited})) . ") " .
                      "AND grant_type <> " . GRANT_DERIVED;
        }
        $query    .= " AND disabledtext = '' " if $exclude_disabled;
        $query    .= "ORDER BY length(login_name) ";
        $query    .= "LIMIT $limit " if $limit;

        # Execute the query, retrieve the results, and make them into
        # User objects.

        &::PushGlobalSQLState();
        &::SendSQL($query);
        push(@users, new Bugzilla::User(&::FetchSQLData())) while &::MoreSQLData();
        &::PopGlobalSQLState();

    }
    else {    # try an exact match

        my $sqlstr = &::SqlQuote($str);
        my $query  = "SELECT userid, realname, login_name " .
                     "FROM profiles " .
                     "WHERE login_name = $sqlstr ";
        # Exact matches don't care if a user is disabled.

        &::PushGlobalSQLState();
        &::SendSQL($query);
        push(@users, new Bugzilla::User(&::FetchSQLData())) if &::MoreSQLData();
        &::PopGlobalSQLState();
    }

    # then try substring search

    if ((scalar(@users) == 0)
        && (&::Param('usermatchmode') eq 'search')
        && (length($str) >= 3))
    {

        my $sqlstr = &::SqlQuote(uc($str));

        my $query  = "SELECT DISTINCT userid, realname, login_name " .
                     "FROM  profiles ";
        if (&::Param('usevisibilitygroups')) {
            $query .= ", user_group_map ";
        }
        $query     .= "WHERE  (INSTR(UPPER(login_name), $sqlstr) " .
                      "OR INSTR(UPPER(realname), $sqlstr)) ";
        if (&::Param('usevisibilitygroups')) {
            $query .= "AND user_group_map.user_id = userid " .
                      "AND isbless = 0 " .
                      "AND group_id IN(" .
                      join(', ', (-1, @{$user->visible_groups_inherited})) . ") " .
                      "AND grant_type <> " . GRANT_DERIVED;
        }
        $query    .= " AND disabledtext = '' " if $exclude_disabled;
        $query    .= "ORDER BY length(login_name) ";
        $query    .= "LIMIT $limit " if $limit;
        &::PushGlobalSQLState();
        &::SendSQL($query);
        push(@users, new Bugzilla::User(&::FetchSQLData())) while &::MoreSQLData();
        &::PopGlobalSQLState();
    }

    # order @users by alpha

    @users = sort { uc($a->login) cmp uc($b->login) } @users;

    return \@users;
}

# match_field() is a CGI wrapper for the match() function.
#
# Here's what it does:
#
# 1. Accepts a list of fields along with whether they may take multiple values
# 2. Takes the values of those fields from $::FORM and passes them to match()
# 3. Checks the results of the match and displays confirmation or failure
#    messages as appropriate.
#
# The confirmation screen functions the same way as verify-new-product and
# confirm-duplicate, by rolling all of the state information into a
# form which is passed back, but in this case the searched fields are
# replaced with the search results.
#
# The act of displaying the confirmation or failure messages means it must
# throw a template and terminate.  When confirmation is sent, all of the
# searchable fields have been replaced by exact fields and the calling script
# is executed as normal.
#
# match_field must be called early in a script, before anything external is
# done with the form data.
#
# In order to do a simple match without dealing with templates, confirmation,
# or globals, simply calling Bugzilla::User::match instead will be
# sufficient.

# How to call it:
#
# Bugzilla::User::match_field ({
#   'field_name'    => { 'type' => fieldtype },
#   'field_name2'   => { 'type' => fieldtype },
#   [...]
# });
#
# fieldtype can be either 'single' or 'multi'.
#

sub match_field {

    my $fields         = shift;   # arguments as a hash
    my $matches      = {};      # the values sent to the template
    my $matchsuccess = 1;       # did the match fail?
    my $need_confirm = 0;       # whether to display confirmation screen

    # prepare default form values

    my $vars = $::vars;
    $vars->{'form'}  = \%::FORM;
    $vars->{'mform'} = \%::MFORM;

    # What does a "--do_not_change--" field look like (if any)?
    my $dontchange = $vars->{'form'}->{'dontchange'};

    # Fields can be regular expressions matching multiple form fields
    # (f.e. "requestee-(\d+)"), so expand each non-literal field
    # into the list of form fields it matches.
    my $expanded_fields = {};
    foreach my $field_pattern (keys %{$fields}) {
        # Check if the field has any non-word characters.  Only those fields
        # can be regular expressions, so don't expand the field if it doesn't
        # have any of those characters.
        if ($field_pattern =~ /^\w+$/) {
            $expanded_fields->{$field_pattern} = $fields->{$field_pattern};
        }
        else {
            my @field_names = grep(/$field_pattern/, keys %{$vars->{'form'}});
            foreach my $field_name (@field_names) {
                $expanded_fields->{$field_name} = 
                  { type => $fields->{$field_pattern}->{'type'} };
                
                # The field is a requestee field; in order for its name 
                # to show up correctly on the confirmation page, we need 
                # to find out the name of its flag type.
                if ($field_name =~ /^requestee-(\d+)$/) {
                    my $flag = Bugzilla::Flag::get($1);
                    $expanded_fields->{$field_name}->{'flag_type'} = 
                      $flag->{'type'};
                }
                elsif ($field_name =~ /^requestee_type-(\d+)$/) {
                    $expanded_fields->{$field_name}->{'flag_type'} = 
                      Bugzilla::FlagType::get($1);
                }
            }
        }
    }
    $fields = $expanded_fields;

    for my $field (keys %{$fields}) {

        # Tolerate fields that do not exist.
        #
        # This is so that fields like qa_contact can be specified in the code
        # and it won't break if $::MFORM does not define them.
        #
        # It has the side-effect that if a bad field name is passed it will be
        # quietly ignored rather than raising a code error.

        next if !defined($vars->{'mform'}->{$field});

        # Skip it if this is a --do_not_change-- field
        next if $dontchange && $dontchange eq $vars->{'form'}->{$field};

        # We need to move the query to $raw_field, where it will be split up,
        # modified by the search, and put back into $::FORM and $::MFORM
        # incrementally.

        my $raw_field = join(" ", @{$vars->{'mform'}->{$field}});
        $vars->{'form'}->{$field}  = '';
        $vars->{'mform'}->{$field} = [];

        my @queries = ();

        # Now we either split $raw_field by spaces/commas and put the list
        # into @queries, or in the case of fields which only accept single
        # entries, we simply use the verbatim text.

        $raw_field =~ s/^\s+|\s+$//sg;  # trim leading/trailing space

        # single field
        if ($fields->{$field}->{'type'} eq 'single') {
            @queries = ($raw_field) unless $raw_field =~ /^\s*$/;

        # multi-field
        }
        elsif ($fields->{$field}->{'type'} eq 'multi') {
            @queries =  split(/[\s,]+/, $raw_field);

        }
        else {
            # bad argument
            ThrowCodeError('bad_arg',
                           { argument => $fields->{$field}->{'type'},
                             function =>  'Bugzilla::User::match_field',
                           });
        }

        my $limit = 0;
        if (&::Param('maxusermatches')) {
            $limit = &::Param('maxusermatches') + 1;
        }

        for my $query (@queries) {

            my $users = match(
                $query,   # match string
                $limit,   # match limit
                1         # exclude_disabled
            );

            # skip confirmation for exact matches
            if ((scalar(@{$users}) == 1)
                && (@{$users}[0]->{'login'} eq $query))
            {
                # delimit with spaces if necessary
                if ($vars->{'form'}->{$field}) {
                    $vars->{'form'}->{$field} .= " ";
                }
                $vars->{'form'}->{$field} .= @{$users}[0]->{'login'};
                push @{$vars->{'mform'}->{$field}}, @{$users}[0]->{'login'};
                next;
            }

            $matches->{$field}->{$query}->{'users'}  = $users;
            $matches->{$field}->{$query}->{'status'} = 'success';

            # here is where it checks for multiple matches

            if (scalar(@{$users}) == 1) { # exactly one match
                # delimit with spaces if necessary
                if ($vars->{'form'}->{$field}) {
                    $vars->{'form'}->{$field} .= " ";
                }
                $vars->{'form'}->{$field} .= @{$users}[0]->{'login'};
                push @{$vars->{'mform'}->{$field}}, @{$users}[0]->{'login'};
                $need_confirm = 1 if &::Param('confirmuniqueusermatch');

            }
            elsif ((scalar(@{$users}) > 1)
                    && (&::Param('maxusermatches') != 1)) {
                $need_confirm = 1;

                if ((&::Param('maxusermatches'))
                   && (scalar(@{$users}) > &::Param('maxusermatches')))
                {
                    $matches->{$field}->{$query}->{'status'} = 'trunc';
                    pop @{$users};  # take the last one out
                }

            }
            else {
                # everything else fails
                $matchsuccess = 0; # fail
                $matches->{$field}->{$query}->{'status'} = 'fail';
                $need_confirm = 1;  # confirmation screen shows failures
            }
        }
    }

    return 1 unless $need_confirm; # skip confirmation if not needed.

    $vars->{'script'}        = $ENV{'SCRIPT_NAME'}; # for self-referencing URLs
    $vars->{'fields'}        = $fields; # fields being matched
    $vars->{'matches'}       = $matches; # matches that were made
    $vars->{'matchsuccess'}  = $matchsuccess; # continue or fail

    print Bugzilla->cgi->header();

    $::template->process("global/confirm-user-match.html.tmpl", $vars)
      || ThrowTemplateError($::template->error());

    exit;

}

sub email_prefs {
    # Get or set (not implemented) the user's email notification preferences.
    
    my $self = shift;
    return {} unless $self->id;
    
    # If the calling code is setting the email preferences, update the object
    # but don't do anything else.  This needs to write email preferences back
    # to the database.
    if (@_) { $self->{email_prefs} = shift; return; }
    
    # If we already got them from the database, return the existing values.
    return $self->{email_prefs} if $self->{email_prefs};
    
    # Retrieve the values from the database.
    &::SendSQL("SELECT emailflags FROM profiles WHERE userid = $self->{id}");
    my ($flags) = &::FetchSQLData();

    my @roles = qw(Owner Reporter QAcontact CClist Voter);
    my @reasons = qw(Removeme Comments Attachments Status Resolved Keywords 
                     CC Other Unconfirmed);

    # If the prefs are empty, this user hasn't visited the email pane
    # of userprefs.cgi since before the change to use the "emailflags" 
    # column, so initialize that field with the default prefs.
    if (!$flags) {
        # Create a default prefs string that causes the user to get all email.
        $flags = "ExcludeSelf~on~FlagRequestee~on~FlagRequester~on~";
        foreach my $role (@roles) {
            foreach my $reason (@reasons) {
                $flags .= "email$role$reason~on~";
            }
        }
        chop $flags;
    }

    # Convert the prefs from the flags string from the database into
    # a Perl record.  The 255 param is here because split will trim 
    # any trailing null fields without a third param, which causes Perl 
    # to eject lots of warnings. Any suitably large number would do.
    my $prefs = { split(/~/, $flags, 255) };
    
    # Determine the value of the "excludeself" global email preference.
    # Note that the value of "excludeself" is assumed to be off if the
    # preference does not exist in the user's list, unlike other 
    # preferences whose value is assumed to be on if they do not exist.
    $prefs->{ExcludeSelf} = 
      exists($prefs->{ExcludeSelf}) && $prefs->{ExcludeSelf} eq "on";
    
    # Determine the value of the global request preferences.
    foreach my $pref (qw(FlagRequestee FlagRequester)) {
        $prefs->{$pref} = !exists($prefs->{$pref}) || $prefs->{$pref} eq "on";
    }
    
    # Determine the value of the rest of the preferences by looping over
    # all roles and reasons and converting their values to Perl booleans.
    foreach my $role (@roles) {
        foreach my $reason (@reasons) {
            my $key = "email$role$reason";
            $prefs->{$key} = !exists($prefs->{$key}) || $prefs->{$key} eq "on";
        }
    }

    $self->{email_prefs} = $prefs;
    
    return $self->{email_prefs};
}

1;

__END__

=head1 NAME

Bugzilla::User - Object for a Bugzilla user

=head1 SYNOPSIS

  use Bugzilla::User;

  my $user = new Bugzilla::User($id);

=head1 DESCRIPTION

This package handles Bugzilla users. Data obtained from here is read-only;
there is currently no way to modify a user from this package.

Note that the currently logged in user (if any) is available via
L<Bugzilla-E<gt>user|Bugzilla/"user">.

=head1 METHODS

=over 4

=item C<new($userid)>

Creates a new C{Bugzilla::User> object for the given user id.  If no user
id was given, a blank object is created with no user attributes.

If an id was given but there was no matching user found, undef is returned.

=begin undocumented

=item C<new_from_login($login)>

Creates a new C<Bugzilla::User> object given the provided login. Returns
C<undef> if no matching user is found.

This routine should not be required in general; most scripts should be using
userids instead.

This routine and C<new> both take an extra optional argument, which is
passed as the argument to C<derive_groups> to avoid locking. See that
routine's documentation for details.

=end undocumented

=item C<id>

Returns the userid for this user.

=item C<login>

Returns the login name for this user.

=item C<email>

Returns the user's email address. Currently this is the same value as the
login.

=item C<name>

Returns the 'real' name for this user, if any.

=item C<showmybugslink>

Returns C<1> if the user has set his preference to show the 'My Bugs' link in
the page footer, and C<0> otherwise.

=item C<identity>

Retruns a string for the identity of the user. This will be of the form
C<name E<lt>emailE<gt>> if the user has specified a name, and C<email>
otherwise.

=item C<nick>

Returns a user "nickname" -- i.e. a shorter, not-necessarily-unique name by
which to identify the user. Currently the part of the user's email address
before the at sign (@), but that could change, especially if we implement
usernames not dependent on email address.

=item C<queries>

Returns an array of the user's named queries, sorted in a case-insensitive
order by name. Each entry is a hash with three keys:

=over

=item *

name - The name of the query

=item *

query - The text for the query

=item *

linkinfooter - Whether or not the query should be displayed in the footer.

=back

=item C<flush_queries_cache>

Some code modifies the set of stored queries. Because C<Bugzilla::User> does
not handle these modifications, but does cache the result of calling C<queries>
internally, such code must call this method to flush the cached result.

=item C<groups>

Returns a hashref of group names for groups the user is a member of. The keys
are the names of the groups, whilst the values are the respective group ids.
(This is so that a set of all groupids for groups the user is in can be
obtained by C<values(%{$user->groups})>.)

=item C<in_group>

Determines whether or not a user is in the given group. This method is mainly
intended for cases where we are not looking at the currently logged in user,
and only need to make a quick check for the group, where calling C<groups>
and getting all of the groups would be overkill.

=item C<derive_groups>

Bugzilla allows for group inheritance. When data about the user (or any of the
groups) changes, the database must be updated. Handling updated groups is taken
care of by the constructor. However, when updating the email address, the
user may be placed into different groups, based on a new email regexp. This
method should be called in such a case to force reresolution of these groups.

=item C<visible_groups_inherited>

Returns a list of all groups whose members should be visible to this user.
Since this list is flattened already, there is no need for all users to
be have derived groups up-to-date to select the users meeting this criteria.

=item C<visible_groups_direct>

Returns a list of groups that the user is aware of.

=begin undocumented

This routine takes an optional argument. If true, then this routine will not
lock the tables, but will rely on the caller to have done so itsself.

This is required because mysql will only execute a query if all of the tables
are locked, or if none of them are, not a mixture. If the caller has already
done some locking, then this routine would fail. Thus the caller needs to lock
all the tables required by this method, and then C<derive_groups> won't do
any locking.

This is a really ugly solution, and when Bugzilla supports transactions
instead of using the explicit table locking we were forced to do when thats
all MySQL supported, this will go away.

=end undocumented

=item C<can_bless>

Returns C<1> if the user can bless at least one group. Otherwise returns C<0>.

=back

=head1 SEE ALSO

L<Bugzilla|Bugzilla>