summaryrefslogtreecommitdiffstats
path: root/Bugzilla/Template.pm
blob: dea207f2118e28f5e0056dbdab95ae30737e3b70 (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
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.


package Bugzilla::Template;

use 5.14.0;
use strict;
use warnings;

use Bugzilla::Constants;
use Bugzilla::WebService::Constants;
use Bugzilla::Hook;
use Bugzilla::Install::Requirements;
use Bugzilla::Install::Util qw(install_string template_include_path 
                               include_languages i_am_persistent);
use Bugzilla::Classification;
use Bugzilla::Keyword;
use Bugzilla::Util;
use Bugzilla::Error;
use Bugzilla::Search;
use Bugzilla::Token;

use Cwd qw(abs_path);
use MIME::Base64;
use Date::Format ();
use Digest::MD5 qw(md5_hex);
use File::Basename qw(basename dirname);
use File::Find;
use File::Path qw(rmtree mkpath);
use File::Slurp;
use File::Spec;
use IO::Dir;
use List::MoreUtils qw(firstidx);
use Scalar::Util qw(blessed);

use parent qw(Template);

use constant FORMAT_TRIPLE => '%19s|%-28s|%-28s';
use constant FORMAT_3_SIZE => [19,28,28];
use constant FORMAT_DOUBLE => '%19s %-55s';
use constant FORMAT_2_SIZE => [19,55];

# Pseudo-constant.
sub SAFE_URL_REGEXP {
    my $safe_protocols = join('|', SAFE_PROTOCOLS);
    return qr/($safe_protocols):[^:\s<>\"][^\s<>\"]+[\w\/]/i;
}

# Convert the constants in the Bugzilla::Constants and Bugzilla::WebService::Constants
# modules into a hash we can pass to the template object for reflection into its "constants" 
# namespace (which is like its "variables" namespace, but for constants). To do so, we
# traverse the arrays of exported and exportable symbols and ignoring the rest
# (which, if Constants.pm exports only constants, as it should, will be nothing else).
sub _load_constants {
    my %constants;
    foreach my $constant (@Bugzilla::Constants::EXPORT,
                          @Bugzilla::Constants::EXPORT_OK)
    {
        if (ref Bugzilla::Constants->$constant) {
            $constants{$constant} = Bugzilla::Constants->$constant;
        }
        else {
            my @list = (Bugzilla::Constants->$constant);
            $constants{$constant} = (scalar(@list) == 1) ? $list[0] : \@list;
        }
    }

    foreach my $constant (@Bugzilla::WebService::Constants::EXPORT, 
                          @Bugzilla::WebService::Constants::EXPORT_OK)
    {
        if (ref Bugzilla::WebService::Constants->$constant) {
            $constants{$constant} = Bugzilla::WebService::Constants->$constant;
        }
        else {
            my @list = (Bugzilla::WebService::Constants->$constant);
            $constants{$constant} = (scalar(@list) == 1) ? $list[0] : \@list;
        }
    }
    return \%constants;
}

# Returns the path to the templates based on the Accept-Language
# settings of the user and of the available languages
# If no Accept-Language is present it uses the defined default
# Templates may also be found in the extensions/ tree
sub _include_path {
    my $lang = shift || '';
    my $cache = Bugzilla->request_cache;
    $cache->{"template_include_path_$lang"} ||= 
        template_include_path({ language => $lang });
    return $cache->{"template_include_path_$lang"};
}

sub get_format {
    my $self = shift;
    my ($template, $format, $ctype) = @_;

    $ctype //= 'html';
    $format //= '';

    # ctype and format can have letters and a hyphen only.
    if ($ctype =~ /[^a-zA-Z\-]/ || $format =~ /[^a-zA-Z\-]/) {
        ThrowUserError('format_not_found', {'format' => $format,
                                            'ctype'  => $ctype,
                                            'invalid' => 1});
    }
    trick_taint($ctype);
    trick_taint($format);

    $template .= ($format ? "-$format" : "");
    $template .= ".$ctype.tmpl";

    # Now check that the template actually exists. We only want to check
    # if the template exists; any other errors (eg parse errors) will
    # end up being detected later.
    eval {
        $self->context->template($template);
    };
    # This parsing may seem fragile, but it's OK:
    # http://lists.template-toolkit.org/pipermail/templates/2003-March/004370.html
    # Even if it is wrong, any sort of error is going to cause a failure
    # eventually, so the only issue would be an incorrect error message
    if ($@ && $@->info =~ /: not found$/) {
        ThrowUserError('format_not_found', {'format' => $format,
                                            'ctype'  => $ctype});
    }

    # Else, just return the info
    return
    {
        'template'    => $template,
        'format'      => $format,
        'extension'   => $ctype,
        'ctype'       => Bugzilla::Constants::contenttypes->{$ctype}
    };
}

# This routine quoteUrls contains inspirations from the HTML::FromText CPAN
# module by Gareth Rees <garethr@cre.canon.co.uk>.  It has been heavily hacked,
# all that is really recognizable from the original is bits of the regular
# expressions.
# This has been rewritten to be faster, mainly by substituting 'as we go'.
# If you want to modify this routine, read the comments carefully

sub quoteUrls {
    my ($text, $bug, $comment, $user, $for_markdown) = @_;
    return $text unless $text;
    $user ||= Bugzilla->user;
    $for_markdown ||= 0;

    # We use /g for speed, but uris can have other things inside them
    # (http://foo/bug#3 for example). Filtering that out filters valid
    # bug refs out, so we have to do replacements.
    # mailto can't contain space or #, so we don't have to bother for that
    # Do this by replacing matches with \x{FDD2}$count\x{FDD3}
    # \x{FDDx} is used because it's unlikely to occur in the text
    # and are reserved unicode characters.

    # If the comment is already wrapped, we should ignore newlines when
    # looking for matching regexps. Else we should take them into account.
    my $s = ($comment && $comment->already_wrapped) ? qr/\s/ : qr/\h/;

    # However, note that adding the title (for buglinks) can affect things
    # In particular, attachment matches go before bug titles, so that titles
    # with 'attachment 1' don't double match.
    # Dupe checks go afterwards, because that uses ^ and \Z, which won't occur
    # if it was substituted as a bug title (since that always involve leading
    # and trailing text)

    # Because of entities, it's easier (and quicker) to do this before escaping

    my @things;
    my $count = 0;
    my $tmp;

    my @hook_regexes;
    Bugzilla::Hook::process('bug_format_comment',
        { text => \$text, bug => $bug, regexes => \@hook_regexes,
          comment => $comment, user => $user });

    foreach my $re (@hook_regexes) {
        my ($match, $replace) = @$re{qw(match replace)};
        if (ref($replace) eq 'CODE') {
            $text =~ s/$match/($things[$count++] = $replace->({matches => [
                                                               $1, $2, $3, $4,
                                                               $5, $6, $7, $8, 
                                                               $9, $10]}))
                               && ("\x{FDD2}" . ($count-1) . "\x{FDD3}")/egx;
        }
        else {
            $text =~ s/$match/($things[$count++] = $replace) 
                              && ("\x{FDD2}" . ($count-1) . "\x{FDD3}")/egx;
        }
    }

    # Provide tooltips for full bug links (Bug 74355)
    my $urlbase_re = '(' . join('|',
        map { qr/$_/ } grep($_, Bugzilla->params->{'urlbase'}, 
                            Bugzilla->params->{'sslbase'})) . ')';
    $text =~ s~\b(${urlbase_re}\Qshow_bug.cgi?id=\E([0-9]+)(\#c([0-9]+))?)\b
              ~($things[$count++] = get_bug_link($3, $1, { comment_num => $5, user => $user })) &&
               ("\x{FDD2}" . ($count-1) . "\x{FDD3}")
              ~egox;

    # non-mailto protocols
    my $safe_protocols = SAFE_URL_REGEXP();
    $text =~ s~\b($safe_protocols)
              ~($tmp = html_quote($1)) &&
               ($things[$count++] = "<a href=\"$tmp\">$tmp</a>") &&
               ("\x{FDD2}" . ($count-1) . "\x{FDD3}")
              ~egox;

    # We have to quote now, otherwise the html itself is escaped
    # THIS MEANS THAT A LITERAL ", <, >, ' MUST BE ESCAPED FOR A MATCH

    $text = html_quote($text);

    unless ($for_markdown) {
        # Color quoted text
        $text =~ s~^(&gt;.+)$~<span class="quote">$1</span >~mg;
        $text =~ s~</span >\n<span class="quote">~\n~g;
    }
    # mailto:
    # Use |<nothing> so that $1 is defined regardless
    # &#64; is the encoded '@' character.
    $text =~ s~\b(mailto:|)?([\w\.\-\+\=]+&\#64;[\w\-]+(?:\.[\w\-]+)+)\b
              ~<a href=\"mailto:$2\">$1$2</a>~igx;

    # attachment links
    $text =~ s~\b(attachment$s*\#?$s*(\d+)(?:$s+\[details\])?)
              ~($things[$count++] = get_attachment_link($2, $1, $user)) &&
               ("\x{FDD2}" . ($count-1) . "\x{FDD3}")
              ~egmxi;

    # Current bug ID this comment belongs to
    my $current_bugurl = $bug ? ("show_bug.cgi?id=" . $bug->id) : "";

    # This handles bug a, comment b type stuff. Because we're using /g
    # we have to do this in one pattern, and so this is semi-messy.
    # Also, we can't use $bug_re?$comment_re? because that will match the
    # empty string
    my $bug_word = template_var('terms')->{bug};
    my $bug_re = qr/\Q$bug_word\E$s*\#?$s*(\d+)/ai;
    my $comment_word = template_var('terms')->{comment};
    my $comment_re = qr/(?:\Q$comment_word\E|comment)$s*\#?$s*(\d+)/ai;
    $text =~ s~\b($bug_re(?:$s*,?$s*$comment_re)?|$comment_re)
              ~ # We have several choices. $1 here is the link, and $2-4 are set
                # depending on which part matched
               (defined($2) ? get_bug_link($2, $1, { comment_num => $3, user => $user }) :
                              "<a href=\"$current_bugurl#c$4\">$1</a>")
              ~egx;

    # Handle a list of bug ids: bugs 1, #2, 3, 4
    # Currently, the only delimiter supported is comma.
    # Concluding "and" and "or" are not supported.
    my $bugs_word = template_var('terms')->{bugs};

    my $bugs_re = qr/\Q$bugs_word\E$s*\#?$s*
                     \d+(?:$s*,$s*\#?$s*\d+)+/ix;

    $text =~ s{($bugs_re)}{
        my $match = $1;
        $match =~ s/((?:#$s*)?(\d+))/get_bug_link($2, $1);/eg;
        $match;
    }eg;

    my $comments_word = template_var('terms')->{comments};

    my $comments_re = qr/(?:comments|\Q$comments_word\E)$s*\#?$s*
                         \d+(?:$s*,$s*\#?$s*\d+)+/ix;

    $text =~ s{($comments_re)}{
        my $match = $1;
        $match =~ s|((?:#$s*)?(\d+))|<a href="$current_bugurl#c$2">$1</a>|g;
        $match;
    }eg;

    # Old duplicate markers. These don't use $bug_word because they are old
    # and were never customizable.
    $text =~ s~(?<=^\*\*\*\ This\ bug\ has\ been\ marked\ as\ a\ duplicate\ of\ )
               (\d+)
               (?=\ \*\*\*\Z)
              ~get_bug_link($1, $1, { user => $user })
              ~egmx;

    # Now remove the encoding hacks in reverse order
    for (my $i = $#things; $i >= 0; $i--) {
        $text =~ s/\x{FDD2}($i)\x{FDD3}/$things[$i]/eg;
    }

    return $text;
}

# Creates a link to an attachment, including its title.
sub get_attachment_link {
    my ($attachid, $link_text, $user) = @_;
    $user ||= Bugzilla->user;

    my $attachment = new Bugzilla::Attachment({ id => $attachid, cache => 1 });

    if ($attachment) {
        my $title = "";
        my $className = "";
        if ($user->can_see_bug($attachment->bug_id)
            && (!$attachment->isprivate || $user->is_insider))
        {
            $title = $attachment->description;
        }
        if ($attachment->isobsolete) {
            $className = "bz_obsolete";
        }
        # Prevent code injection in the title.
        $title = html_quote(clean_text($title));

        $link_text =~ s/ \[details\]$//;
        my $linkval = "attachment.cgi?id=$attachid";

        # If the attachment is a patch, try to link to the diff rather
        # than the text, by default.
        my $patchlink = "";
        if ($attachment->ispatch and Bugzilla->feature('patch_viewer')) {
            $patchlink = '&amp;action=diff';
        }

        # Whitespace matters here because these links are in <pre> tags.
        return qq|<span class="$className">|
               . qq|<a href="${linkval}${patchlink}" name="attach_${attachid}" title="$title">$link_text</a>|
               . qq| <a href="${linkval}&amp;action=edit" title="$title">[details]</a>|
               . qq|</span>|;
    }
    else {
        return qq{$link_text};
    }
}

# Creates a link to a bug, including its title.
# It takes either two or three parameters:
#  - The bug number
#  - The link text, to place between the <a>..</a>
#  - An optional comment number, for linking to a particular
#    comment in the bug

sub get_bug_link {
    my ($bug, $link_text, $options) = @_;
    $options ||= {};
    $options->{user} ||= Bugzilla->user;

    if (defined $bug && $bug ne '') {
        if (!blessed($bug)) {
            require Bugzilla::Bug;
            $bug = new Bugzilla::Bug({ id => $bug, cache => 1 });
        }
        return $link_text if $bug->{error};
    }

    my $template = Bugzilla->template_inner;
    my $linkified;
    $template->process('bug/link.html.tmpl', 
        { bug => $bug, link_text => $link_text, %$options }, \$linkified);
    $linkified =~ s/\n//g;        # strip newlines to prevent markdown conflicts
    $linkified =~ s/\|/&#124;/g;  # escape '|', it confuses markdown tables
    return $linkified;
}

# We use this instead of format because format doesn't deal well with
# multi-byte languages.
sub multiline_sprintf {
    my ($format, $args, $sizes) = @_;
    my @parts;
    my @my_sizes = @$sizes; # Copy this so we don't modify the input array.
    foreach my $string (@$args) {
        my $size = shift @my_sizes;
        my @pieces = split("\n", wrap_hard($string, $size));
        push(@parts, \@pieces);
    }

    my $formatted;
    while (1) {
        # Get the first item of each part.
        my @line = map { shift @$_ } @parts;
        # If they're all undef, we're done.
        last if !grep { defined $_ } @line;
        # Make any single undef item into ''
        @line = map { defined $_ ? $_ : '' } @line;
        # And append a formatted line
        $formatted .= sprintf($format, @line);
        # Remove trailing spaces, or they become lots of =20's in
        # quoted-printable emails.
        $formatted =~ s/\s+$//;
        $formatted .= "\n";
    }
    return $formatted;
}

#####################
# Header Generation #
#####################

# Returns the last modification time of a file, as an integer number of
# seconds since the epoch.
sub _mtime { return (stat($_[0]))[9] }

sub mtime_filter {
    my ($file_url, $mtime) = @_;
    # This environment var is set in the .htaccess if we have mod_headers
    # and mod_expires installed, to make sure that JS and CSS with "?"
    # after them will still be cached by clients.
    return $file_url if !$ENV{BZ_CACHE_CONTROL};
    if (!$mtime) {
        my $cgi_path = bz_locations()->{'cgi_path'};
        my $file_path = "$cgi_path/$file_url";
        $mtime = _mtime($file_path);
    }
    return "$file_url?$mtime";
}

# Set up the skin CSS cascade:
#
#  1. standard/global.css
#  2. YUI CSS
#  3. Standard Bugzilla stylesheet set
#  4. Third-party "skin" stylesheet set, per user prefs
#  5. Inline css passed to global/header.html.tmpl
#  6. Custom Bugzilla stylesheet set

sub css_files {
    my ($style_urls, $yui, $yui_css) = @_;

    # global.css goes on every page.
    my @requested_css = ('skins/standard/global.css', @$style_urls);

    my @yui_required_css;
    foreach my $yui_name (@$yui) {
        next if !$yui_css->{$yui_name};
        push(@yui_required_css, "js/yui/assets/skins/sam/$yui_name.css");
    }
    unshift(@requested_css, @yui_required_css);
    
    my @css_sets = map { _css_link_set($_) } @requested_css;
    
    my %by_type = (standard => [], skin => [], custom => []);
    foreach my $set (@css_sets) {
        foreach my $key (keys %$set) {
            push(@{ $by_type{$key} }, $set->{$key});
        }
    }

    # build unified
    $by_type{unified_standard_skin} = _concatenate_css($by_type{standard},
                                                       $by_type{skin});
    $by_type{unified_custom} = _concatenate_css($by_type{custom});

    return \%by_type;
}

sub _css_link_set {
    my ($file_name) = @_;

    my %set = (standard => mtime_filter($file_name));

    # We use (?:^|/) to allow Extensions to use the skins system if they want.
    if ($file_name !~ m{(?:^|/)skins/standard/}) {
        return \%set;
    }

    my $skin = Bugzilla->user->settings->{skin}->{value};
    my $cgi_path = bz_locations()->{'cgi_path'};
    my $skin_file_name = $file_name;
    $skin_file_name =~ s{(?:^|/)skins/standard/}{skins/contrib/$skin/};
    if (my $mtime = _mtime("$cgi_path/$skin_file_name")) {
        $set{skin} = mtime_filter($skin_file_name, $mtime);
    }

    my $custom_file_name = $file_name;
    $custom_file_name =~ s{(?:^|/)skins/standard/}{skins/custom/};
    if (my $custom_mtime = _mtime("$cgi_path/$custom_file_name")) {
        $set{custom} = mtime_filter($custom_file_name, $custom_mtime);
    }

    return \%set;
}

sub _concatenate_css {
    my @sources = map { @$_ } @_;
    return unless @sources;

    my %files =
        map {
            (my $file = $_) =~ s/(^[^\?]+)\?.+/$1/;
            $_ => $file;
        } @sources;

    my $cgi_path   = bz_locations()->{cgi_path};
    my $skins_path = bz_locations()->{assetsdir};

    # build minified files
    my @minified;
    foreach my $source (@sources) {
        next unless -e "$cgi_path/$files{$source}";
        my $file = $skins_path . '/' . md5_hex($source) . '.css';
        if (!-e $file) {
            my $content = read_file("$cgi_path/$files{$source}");

            # minify
            $content =~ s{/\*.*?\*/}{}sg;   # comments
            $content =~ s{(^\s+|\s+$)}{}mg; # leading/trailing whitespace
            $content =~ s{\n}{}g;           # single line

            # rewrite urls
            $content =~ s{url\(([^\)]+)\)}{_css_url_rewrite($source, $1)}eig;

            write_file($file, "/* $files{$source} */\n" . $content . "\n");
        }
        push @minified, $file;
    }

    # concat files
    my $file = $skins_path . '/' . md5_hex(join(' ', @sources)) . '.css';
    if (!-e $file) {
        my $content = '';
        foreach my $source (@minified) {
            $content .= read_file($source);
        }
        write_file($file, $content);
    }

    $file =~ s/^\Q$cgi_path\E\///o;
    return mtime_filter($file);
}

sub _css_url_rewrite {
    my ($source, $url) = @_;
    # rewrite relative urls as the unified stylesheet lives in a different
    # directory from the source
    $url =~ s/(^['"]|['"]$)//g;
    if (substr($url, 0, 1) eq '/' || substr($url, 0, 5) eq 'data:') {
        return 'url(' . $url . ')';
    }
    return 'url(../../' . ($ENV{'PROJECT'} ? '../' : '') . dirname($source) . '/' . $url . ')';
}

sub _concatenate_js {
    return @_ unless CONCATENATE_ASSETS;
    my ($sources) = @_;
    return [] unless $sources;
    $sources = ref($sources) ? $sources : [ $sources ];

    my %files =
        map {
            (my $file = $_) =~ s/(^[^\?]+)\?.+/$1/;
            $_ => $file;
        } @$sources;

    my $cgi_path   = bz_locations()->{cgi_path};
    my $skins_path = bz_locations()->{assetsdir};

    # build minified files
    my @minified;
    foreach my $source (@$sources) {
        next unless -e "$cgi_path/$files{$source}";
        my $file = $skins_path . '/' . md5_hex($source) . '.js';
        if (!-e $file) {
            my $content = read_file("$cgi_path/$files{$source}");

            # minimal minification
            $content =~ s#/\*.*?\*/##sg;    # block comments
            $content =~ s#(^ +| +$)##gm;    # leading/trailing spaces
            $content =~ s#^//.+$##gm;       # single line comments
            $content =~ s#\n{2,}#\n#g;      # blank lines
            $content =~ s#(^\s+|\s+$)##g;   # whitespace at the start/end of file

            write_file($file, ";/* $files{$source} */\n" . $content . "\n");
        }
        push @minified, $file;
    }

    # concat files
    my $file = $skins_path . '/' . md5_hex(join(' ', @$sources)) . '.js';
    if (!-e $file) {
        my $content = '';
        foreach my $source (@minified) {
            $content .= read_file($source);
        }
        write_file($file, $content);
    }

    $file =~ s/^\Q$cgi_path\E\///o;
    return [ $file ];
}

# YUI dependency resolution
sub yui_resolve_deps {
    my ($yui, $yui_deps) = @_;
    
    my @yui_resolved;
    foreach my $yui_name (@$yui) {
        my $deps = $yui_deps->{$yui_name} || [];
        foreach my $dep (reverse @$deps) {
            push(@yui_resolved, $dep) if !grep { $_ eq $dep } @yui_resolved;
        }
        push(@yui_resolved, $yui_name) if !grep { $_ eq $yui_name } @yui_resolved;
    }
    return \@yui_resolved;
}

###############################################################################
# Templatization Code

# The Template Toolkit throws an error if a loop iterates >1000 times.
# We want to raise that limit.
# NOTE: If you change this number, you MUST RE-RUN checksetup.pl!!!
# If you do not re-run checksetup.pl, the change you make will not apply
$Template::Directive::WHILE_MAX = 1000000;

# Use the Toolkit Template's Stash module to add utility pseudo-methods
# to template variables.
use Template::Stash;

# Allow keys to start with an underscore or a dot.
$Template::Stash::PRIVATE = undef;

# Add "contains***" methods to list variables that search for one or more 
# items in a list and return boolean values representing whether or not 
# one/all/any item(s) were found.
$Template::Stash::LIST_OPS->{ contains } =
  sub {
      my ($list, $item) = @_;
      if (ref $item && $item->isa('Bugzilla::Object')) {
          return grep($_->id == $item->id, @$list);
      } else {
          return grep($_ eq $item, @$list);
      }
  };

$Template::Stash::LIST_OPS->{ containsany } =
  sub {
      my ($list, $items) = @_;
      foreach my $item (@$items) { 
          if (ref $item && $item->isa('Bugzilla::Object')) {
              return 1 if grep($_->id == $item->id, @$list);
          } else {
              return 1 if grep($_ eq $item, @$list);
          }
      }
      return 0;
  };

# Clone the array reference to leave the original one unaltered.
$Template::Stash::LIST_OPS->{ clone } =
  sub {
      my $list = shift;
      return [@$list];
  };

# Allow us to sort the list of fields correctly
$Template::Stash::LIST_OPS->{ sort_by_field_name } =
    sub {
        sub field_name {
            if ($_[0] eq 'noop') {
                # Sort --- first
                return '';
            }
            # Otherwise sort by field_desc or description
            return $_[1]{$_[0]} || $_[0];
        }
        my ($list, $field_desc) = @_;
        return [ sort { lc field_name($a, $field_desc) cmp lc field_name($b, $field_desc) } @$list ];
    };

# Allow us to still get the scalar if we use the list operation ".0" on it,
# as we often do for defaults in query.cgi and other places.
$Template::Stash::SCALAR_OPS->{ 0 } = 
  sub {
      return $_[0];
  };

# Add a "truncate" method to the Template Toolkit's "scalar" object
# that truncates a string to a certain length.
$Template::Stash::SCALAR_OPS->{ truncate } = 
  sub {
      my ($string, $length, $ellipsis) = @_;
      return $string if !$length || length($string) <= $length;

      $ellipsis ||= '';
      my $strlen = $length - length($ellipsis);
      my $newstr = substr($string, 0, $strlen) . $ellipsis;
      return $newstr;
  };

# Create the template object that processes templates and specify
# configuration parameters that apply to all templates.

###############################################################################

sub process {
    my $self = shift;
    # All of this current_langs stuff allows template_inner to correctly
    # determine what-language Template object it should instantiate.
    my $current_langs = Bugzilla->request_cache->{template_current_lang} ||= [];
    unshift(@$current_langs, $self->context->{bz_language});
    my $retval = $self->SUPER::process(@_);
    shift @$current_langs;
    return $retval;
}

# Construct the Template object

# Note that all of the failure cases here can't use templateable errors,
# since we won't have a template to use...

sub create {
    my $class = shift;
    my %opts = @_;

    # IMPORTANT - If you make any FILTER changes here, make sure to
    # make them in t/004.template.t also, if required.

    my $config = {
        # Colon-separated list of directories containing templates.
        INCLUDE_PATH => $opts{'include_path'} 
                        || _include_path($opts{'language'}),

        # Remove white-space before template directives (PRE_CHOMP) and at the
        # beginning and end of templates and template blocks (TRIM) for better
        # looking, more compact content.  Use the plus sign at the beginning
        # of directives to maintain white space (i.e. [%+ DIRECTIVE %]).
        PRE_CHOMP => 1,
        TRIM => 1,

        # Bugzilla::Template::Plugin::Hook uses the absolute (in mod_perl)
        # or relative (in mod_cgi) paths of hook files to explicitly compile
        # a specific file. Also, these paths may be absolute at any time
        # if a packager has modified bz_locations() to contain absolute
        # paths.
        ABSOLUTE => 1,
        RELATIVE => i_am_persistent() ? 0 : 1,

        COMPILE_DIR => bz_locations()->{'template_cache'},

        # Don't check for a template update until 1 hour has passed since the
        # last check.
        STAT_TTL    => 60 * 60,

        # Initialize templates (f.e. by loading plugins like Hook).
        PRE_PROCESS => ["global/variables.none.tmpl"],

        ENCODING => 'UTF-8',

        # Functions for processing text within templates in various ways.
        # IMPORTANT!  When adding a filter here that does not override a
        # built-in filter, please also add a stub filter to t/004template.t.
        FILTERS => {

            # Returns the text with backslashes, single/double quotes,
            # and newlines/carriage returns escaped for use in JS strings.
            js => sub {
                my ($var) = @_;
                $var =~ s/([\\\'\"\/])/\\$1/g;
                $var =~ s/\n/\\n/g;
                $var =~ s/\r/\\r/g;
                $var =~ s/\x{2028}/\\u2028/g; # unicode line separator
                $var =~ s/\x{2029}/\\u2029/g; # unicode paragraph separator
                $var =~ s/\@/\\x40/g; # anti-spam for email addresses
                $var =~ s/</\\x3c/g;
                $var =~ s/>/\\x3e/g;
                return $var;
            },
            
            # Converts data to base64
            base64 => sub {
                my ($data) = @_;
                return encode_base64($data);
            },

            # Strips out control characters excepting whitespace
            strip_control_chars => sub {
                my ($data) = @_;
                $data =~ s/(?![\t\r\n])[[:cntrl:]]//g;
                return $data;
            },

            # HTML collapses newlines in element attributes to a single space,
            # so form elements which may have whitespace (ie comments) need
            # to be encoded using &#013;
            # See bugs 4928, 22983 and 32000 for more details
            html_linebreak => sub {
                my ($var) = @_;
                $var = html_quote($var);
                $var =~ s/\r\n/\&#013;/g;
                $var =~ s/\n\r/\&#013;/g;
                $var =~ s/\r/\&#013;/g;
                $var =~ s/\n/\&#013;/g;
                return $var;
            },

            xml => \&Bugzilla::Util::xml_quote ,

            # This filter is similar to url_quote but used a \ instead of a %
            # as prefix. In addition it replaces a ' ' by a '_'.
            css_class_quote => \&Bugzilla::Util::css_class_quote ,

            # Removes control characters and trims extra whitespace.
            clean_text => \&Bugzilla::Util::clean_text ,

            quoteUrls => [ sub {
                               my ($context, $bug, $comment, $user) = @_;
                               return sub {
                                   my $text = shift;
                                   return quoteUrls($text, $bug, $comment, $user);
                               };
                           },
                           1
                         ],

            markdown => [ sub {
                              my ($context, $bug, $comment, $user) = @_;
                              return sub {
                                  my $text = shift;
                                  return unless $text;

                                  if (Bugzilla->feature('markdown')
                                      && ((ref($comment) eq 'HASH' && $comment->{is_markdown})
                                         || (ref($comment) eq 'Bugzilla::Comment' && $comment->is_markdown)))
                                  {
                                      return Bugzilla->markdown->markdown($text);
                                  }
                                  return quoteUrls($text, $bug, $comment, $user);
                              };
                          },
                          1
                        ],

            bug_link => [ sub {
                              my ($context, $bug, $options) = @_;
                              return sub {
                                  my $text = shift;
                                  return get_bug_link($bug, $text, $options);
                              };
                          },
                          1
                        ],

            bug_list_link => sub {
                my ($buglist, $options) = @_;
                return join(", ", map(get_bug_link($_, $_, $options), split(/ *, */, $buglist)));
            },

            # In CSV, quotes are doubled, and any value containing a quote or a
            # comma is enclosed in quotes.
            # If a field starts with either "=", "+", "-" or "@", it is preceded
            # by a space to prevent stupid formula execution from Excel & co.
            csv => sub
            {
                my ($var) = @_;
                $var = ' ' . $var if $var =~ /^[+=@-]/;
                # backslash is not special to CSV, but it can be used to confuse some browsers...
                # so we do not allow it to happen. We only do this for logged-in users.
                $var =~ s/\\/\x{FF3C}/g if Bugzilla->user->id;
                $var =~ s/\"/\"\"/g;
                if ($var !~ /^-?(\d+\.)?\d*$/) {
                    $var = "\"$var\"";
                }
                return $var;
            } ,

            # Format a filesize in bytes to a human readable value
            unitconvert => sub
            {
                my ($data) = @_;
                my $retval = "";
                my %units = (
                    'KB' => 1024,
                    'MB' => 1024 * 1024,
                    'GB' => 1024 * 1024 * 1024,
                );

                if ($data < 1024) {
                    return "$data bytes";
                } 
                else {
                    my $u;
                    foreach $u ('GB', 'MB', 'KB') {
                        if ($data >= $units{$u}) {
                            return sprintf("%.2f %s", $data/$units{$u}, $u);
                        }
                    }
                }
            },

            # Format a time for display (more info in Bugzilla::Util)
            time => [ sub {
                          my ($context, $format, $timezone) = @_;
                          return sub {
                              my $time = shift;
                              return format_time($time, $format, $timezone);
                          };
                      },
                      1
                    ],

            html => \&Bugzilla::Util::html_quote,

            html_light => \&Bugzilla::Util::html_light_quote,

            email => \&Bugzilla::Util::email_filter,
            
            mtime => \&mtime_filter,

            # iCalendar contentline filter
            ics => [ sub {
                         my ($context, @args) = @_;
                         return sub {
                             my ($var) = shift;
                             my ($par) = shift @args;
                             my ($output) = "";

                             $var =~ s/[\r\n]/ /g;
                             $var =~ s/([;\\\",])/\\$1/g;

                             if ($par) {
                                 $output = sprintf("%s:%s", $par, $var);
                             } else {
                                 $output = $var;
                             }
                             
                             $output =~ s/(.{75,75})/$1\n /g;

                             return $output;
                         };
                     },
                     1
                     ],

            # Note that using this filter is even more dangerous than
            # using "none," and you should only use it when you're SURE
            # the output won't be displayed directly to a web browser.
            txt => sub {
                my ($var) = @_;
                # Trivial HTML tag remover
                $var =~ s/<[^>]*>//g;
                # And this basically reverses the html filter.
                $var =~ s/\&#64;/@/g;
                $var =~ s/\&lt;/</g;
                $var =~ s/\&gt;/>/g;
                $var =~ s/\&quot;/\"/g;
                $var =~ s/\&amp;/\&/g;
                # Now remove extra whitespace...
                my $collapse_filter = $Template::Filters::FILTERS->{collapse};
                $var = $collapse_filter->($var);
                # And if we're not in the WebService, wrap the message.
                # (Wrapping the message in the WebService is unnecessary
                # and causes awkward things like \n's appearing in error
                # messages in JSON-RPC.)
                unless (i_am_webservice()) {
                    $var = wrap_comment($var, 72);
                }
                $var =~ s/\&nbsp;/ /g;

                return $var;
            },

            # Wrap a displayed comment to the appropriate length
            wrap_comment => [
                sub {
                    my ($context, $cols) = @_;
                    return sub { wrap_comment($_[0], $cols) }
                }, 1],

            # Wrap cited text
            wrap_cite => [
                sub {
                    my ($context, $cols) = @_;
                    return sub { wrap_cite($_[0], $cols) }
                }, 1],

            # We force filtering of every variable in key security-critical
            # places; we have a none filter for people to use when they 
            # really, really don't want a variable to be changed.
            none => sub { return $_[0]; } ,
        },

        PLUGIN_BASE => 'Bugzilla::Template::Plugin',

        CONSTANTS => _load_constants(),

        # Default variables for all templates
        VARIABLES => {
            # Function for retrieving global parameters.
            'Param' => sub { return Bugzilla->params->{$_[0]}; },

            # Function to create date strings
            'time2str' => \&Date::Format::time2str,

            # Fixed size column formatting for bugmail.
            'format_columns' => sub {
                my $cols = shift;
                my $format = ($cols == 3) ? FORMAT_TRIPLE : FORMAT_DOUBLE;
                my $col_size = ($cols == 3) ? FORMAT_3_SIZE : FORMAT_2_SIZE;
                return multiline_sprintf($format, \@_, $col_size);
            },

            # Generic linear search function
            'lsearch' => sub {
                my ($array, $item) = @_;
                return firstidx { $_ eq $item } @$array;
            },

            # Currently logged in user, if any
            # If an sudo session is in progress, this is the user we're faking
            'user' => sub { return Bugzilla->user; },

            # TT directives are evaluated in list context, conflicting
            # with CGI checks about using $cgi->param() in list context.
            'cgi_param' => sub { return scalar Bugzilla->cgi->param($_[0]) },

            # Currenly active language
            'current_language' => sub { return Bugzilla->current_language; },

            # If an sudo session is in progress, this is the user who
            # started the session.
            'sudoer' => sub { return Bugzilla->sudoer; },

            # Allow templates to access the "correct" URLBase value
            'urlbase' => sub { return Bugzilla::Util::correct_urlbase(); },

            # Allow templates to access docs url with users' preferred language
            # We fall back to English if documentation in the preferred
            # language is not available
            'docs_urlbase' => sub {
                my $docs_urlbase;
                my $lang = Bugzilla->current_language;
                # Translations currently available on readthedocs.org
                my @rtd_translations = ('en', 'fr');

                if ($lang ne 'en' && -f "docs/$lang/html/index.html") {
                    $docs_urlbase = "docs/$lang/html/";
                }
                elsif (-f "docs/en/html/index.html") {
                    $docs_urlbase = "docs/en/html/";
                }
                else {
                    if (!grep { $_ eq $lang } @rtd_translations) {
                        $lang = "en";
                    }

                    my $version = BUGZILLA_VERSION;
                    $version =~ /^(\d+)\.(\d+)/;
                    if ($2 % 2 == 1) {
                        # second number is odd; development version
                        $version = 'latest';
                    }
                    else {
                        $version = "$1.$2";
                    }

                    $docs_urlbase = "https://bugzilla.readthedocs.org/$lang/$version/";
                }

                return $docs_urlbase;
            },

            # Check whether the URL is safe.
            'is_safe_url' => sub {
                my $url = shift;
                return 0 unless $url;

                my $safe_url_regexp = SAFE_URL_REGEXP();
                return 1 if $url =~ /^$safe_url_regexp$/;
                # Pointing to a local file with no colon in its name is fine.
                return 1 if $url =~ /^[^\s<>\":]+[\w\/]$/i;
                # If we come here, then we cannot guarantee it's safe.
                return 0;
            },

            # Allow templates to generate a token themselves.
            'issue_hash_token' => \&Bugzilla::Token::issue_hash_token,

            'get_login_request_token' => sub {
                my $cookie = Bugzilla->cgi->cookie('Bugzilla_login_request_cookie');
                return $cookie ? issue_hash_token(['login_request', $cookie]) : '';
            },

            'get_api_token' => sub {
                return '' unless Bugzilla->user->id;
                my $cache = Bugzilla->request_cache;
                return $cache->{api_token} //= issue_api_token();
            },

            # A way for all templates to get at Field data, cached.
            'bug_fields' => sub {
                my $cache = Bugzilla->request_cache;
                $cache->{template_bug_fields} ||=
                    Bugzilla->fields({ by_name => 1 });
                return $cache->{template_bug_fields};
            },

            # A general purpose cache to store rendered templates for reuse.
            # Make sure to not mix language-specific data.
            'template_cache' => sub {
                my $cache = Bugzilla->request_cache->{template_cache} ||= {};
                $cache->{users} ||= {};
                return $cache;
            },

            'css_files' => \&css_files,
            yui_resolve_deps => \&yui_resolve_deps,
            concatenate_js => \&_concatenate_js,

            # All classifications (sorted by sortkey, name)
            'all_classifications' => sub {
                return [map { $_->name } Bugzilla::Classification->get_all()];
            },

            # Whether or not keywords are enabled, in this Bugzilla.
            'use_keywords' => sub { return Bugzilla::Keyword->any_exist; },

            # All the keywords
            'all_keywords' => sub {
                return [map { $_->name } Bugzilla::Keyword->get_all()];
            },

            # All the active keywords
            'active_keywords' => sub {
                return [map { $_->name } grep { $_->is_active } Bugzilla::Keyword->get_all()];
            },

            'feature_enabled' => sub { return Bugzilla->feature(@_); },

            # field_descs can be somewhat slow to generate, so we generate
            # it only once per-language no matter how many times
            # $template->process() is called.
            'field_descs' => sub { return template_var('field_descs') },

            # Calling bug/field-help.none.tmpl once per label is very
            # expensive, so we generate it once per-language.
            'help_html' => sub { return template_var('help_html') },

            # This way we don't have to load field-descs.none.tmpl in
            # many templates.
            'display_value' => \&Bugzilla::Util::display_value,

            'install_string' => \&Bugzilla::Install::Util::install_string,

            'report_columns' => \&Bugzilla::Search::REPORT_COLUMNS,

            # These don't work as normal constants.
            DB_MODULE        => \&Bugzilla::Constants::DB_MODULE,
            REQUIRED_MODULES => 
                \&Bugzilla::Install::Requirements::REQUIRED_MODULES,
            OPTIONAL_MODULES => sub {
                my @optional = @{OPTIONAL_MODULES()};
                foreach my $item (@optional) {
                    my @features;
                    foreach my $feat_id (@{ $item->{feature} }) {
                        push(@features, install_string("feature_$feat_id"));
                    }
                    $item->{feature} = \@features;
                }
                return \@optional;
            },
            'default_authorizer' => sub { return Bugzilla::Auth->new() },

            'login_not_email' => sub {
                my $params = Bugzilla->params;
                my $cache = Bugzilla->request_cache;

                return $cache->{login_not_email} //=
                  (!$params->{use_email_as_login}
                     || ($params->{user_verify_class} =~ /LDAP/ && $params->{LDAPmailattribute})
                     || ($params->{user_verify_class} =~ /RADIUS/ && $params->{RADIUS_email_suffix}))
                  ? 1 : 0;
            },
        },
    };
    # Use a per-process provider to cache compiled templates in memory across
    # requests.
    my $provider_key = join(':', @{ $config->{INCLUDE_PATH} });
    my $shared_providers = Bugzilla->process_cache->{shared_providers} ||= {};
    $shared_providers->{$provider_key} ||= Template::Provider->new($config);
    $config->{LOAD_TEMPLATES} = [ $shared_providers->{$provider_key} ];

    local $Template::Config::CONTEXT = 'Bugzilla::Template::Context';

    Bugzilla::Hook::process('template_before_create', { config => $config });
    my $template = $class->new($config) 
        || die("Template creation failed: " . $class->error());

    # Pass on our current language to any template hooks or inner templates
    # called by this Template object.
    $template->context->{bz_language} = $opts{language} || '';

    return $template;
}

# Used as part of the two subroutines below.
our %_templates_to_precompile;
sub precompile_templates {
    my ($output) = @_;

    # Remove the compiled templates.
    my $cache_dir = bz_locations()->{'template_cache'};
    my $datadir = bz_locations()->{'datadir'};
    if (-e $cache_dir) {
        print install_string('template_removing_dir') . "\n" if $output;

        # This frequently fails if the webserver made the files, because
        # then the webserver owns the directories.
        rmtree($cache_dir);

        # Check that the directory was really removed, and if not, move it
        # into data/deleteme/.
        if (-e $cache_dir) {
            my $deleteme = "$datadir/deleteme";
            
            print STDERR "\n\n",
                install_string('template_removal_failed', 
                               { deleteme => $deleteme, 
                                 template_cache => $cache_dir }), "\n\n";
            mkpath($deleteme);
            my $random = generate_random_password();
            rename($cache_dir, "$deleteme/$random")
              or die "move failed: $!";
        }
    }

    print install_string('template_precompile') if $output;

    # Pre-compile all available languages.
    my $paths = template_include_path({ language => Bugzilla->languages });

    foreach my $dir (@$paths) {
        my $template = Bugzilla::Template->create(include_path => [$dir]);

        %_templates_to_precompile = ();
        # Traverse the template hierarchy.
        find({ wanted => \&_precompile_push, no_chdir => 1 }, $dir);
        # The sort isn't totally necessary, but it makes debugging easier
        # by making the templates always be compiled in the same order.
        foreach my $file (sort keys %_templates_to_precompile) {
            $file =~ s{^\Q$dir\E/}{};
            # Compile the template but throw away the result. This has the side-
            # effect of writing the compiled version to disk.
            $template->context->template($file);
        }

        # Clear out the cached Provider object
        Bugzilla->process_cache->{shared_providers} = undef;
    }

    # Under mod_perl, we look for templates using the absolute path of the
    # template directory, which causes Template Toolkit to look for their 
    # *compiled* versions using the full absolute path under the data/template
    # directory. (Like data/template/var/www/html/bugzilla/.) To avoid
    # re-compiling templates under mod_perl, we symlink to the
    # already-compiled templates. This doesn't work on Windows.
    if (!ON_WINDOWS) {
        # We do these separately in case they're in different locations.
        _do_template_symlink(bz_locations()->{'templatedir'});
        _do_template_symlink(bz_locations()->{'extensionsdir'});
    }

    # If anything created a Template object before now, clear it out.
    delete Bugzilla->request_cache->{template};

    print install_string('done') . "\n" if $output;
}

# Helper for precompile_templates
sub _precompile_push {
    my $name = $File::Find::name;
    return if (-d $name);
    return if ($name =~ /\/CVS\//);
    return if ($name !~ /\.tmpl$/);
    $_templates_to_precompile{$name} = 1;
}

# Helper for precompile_templates
sub _do_template_symlink {
    my $dir_to_symlink = shift;

    my $abs_path = abs_path($dir_to_symlink);

    # If $dir_to_symlink is already an absolute path (as might happen
    # with packagers who set $libpath to an absolute path), then we don't
    # need to do this symlink.
    return if ($abs_path eq $dir_to_symlink);

    my $abs_root  = dirname($abs_path);
    my $dir_name  = basename($abs_path);
    my $cache_dir   = bz_locations()->{'template_cache'};
    my $container = "$cache_dir$abs_root";
    mkpath($container);
    my $target = "$cache_dir/$dir_name";
    # Check if the directory exists, because if there are no extensions,
    # there won't be an "data/template/extensions" directory to link to.
    if (-d $target) {
        # We use abs2rel so that the symlink will look like 
        # "../../../../template" which works, while just 
        # "data/template/template/" doesn't work.
        my $relative_target = File::Spec->abs2rel($target, $container);

        my $link_name = "$container/$dir_name";
        symlink($relative_target, $link_name)
          or warn "Could not make $link_name a symlink to $relative_target: $!";
    }
}

1;

__END__

=head1 NAME

Bugzilla::Template - Wrapper around the Template Toolkit C<Template> object

=head1 SYNOPSIS

  my $template = Bugzilla::Template->create;
  my $format = $template->get_format("foo/bar",
                                     scalar($cgi->param('format')),
                                     scalar($cgi->param('ctype')));

=head1 DESCRIPTION

This is basically a wrapper so that the correct arguments get passed into
the C<Template> constructor.

It should not be used directly by scripts or modules - instead, use
C<Bugzilla-E<gt>instance-E<gt>template> to get an already created module.

=head1 SUBROUTINES

=over

=item C<precompile_templates($output)>

Description: Compiles all of Bugzilla's templates in every language.
             Used mostly by F<checksetup.pl>.

Params:      C<$output> - C<true> if you want the function to print
               out information about what it's doing.

Returns:     nothing

=back

=head1 METHODS

=over

=item C<get_format($file, $format, $ctype)>

 Description: Construct a format object from URL parameters.

 Params:      $file   - Name of the template to display.
              $format - When the template exists under several formats
                        (e.g. table or graph), specify the one to choose.
              $ctype  - Content type, see Bugzilla::Constants::contenttypes.

 Returns:     A format object.

=back

=head1 SEE ALSO

L<Bugzilla>, L<Template>

=head1 B<Methods in need of POD>

=over

=item multiline_sprintf

=item create

=item css_files

=item mtime_filter

=item yui_resolve_deps

=item process

=item get_bug_link

=item quoteUrls

=item get_attachment_link

=item SAFE_URL_REGEXP

=back