Revert "avoid showing comment post stuff on dynamic pages"
[ikiwiki.git] / IkiWiki / Plugin / comments.pm
1 #!/usr/bin/perl
2 # Copyright © 2006-2008 Joey Hess <joey@ikiwiki.info>
3 # Copyright © 2008 Simon McVittie <http://smcv.pseudorandom.co.uk/>
4 # Licensed under the GNU GPL, version 2, or any later version published by the
5 # Free Software Foundation
6 package IkiWiki::Plugin::comments;
7
8 use warnings;
9 use strict;
10 use IkiWiki 3.00;
11 use Encode;
12 use POSIX qw(strftime);
13
14 use constant PREVIEW => "Preview";
15 use constant POST_COMMENT => "Post comment";
16 use constant CANCEL => "Cancel";
17
18 my $postcomment;
19 my %commentstate;
20
21 sub import {
22         hook(type => "checkconfig", id => 'comments',  call => \&checkconfig);
23         hook(type => "getsetup", id => 'comments',  call => \&getsetup);
24         hook(type => "preprocess", id => 'comment', call => \&preprocess);
25         # here for backwards compatability with old comments
26         hook(type => "preprocess", id => '_comment', call => \&preprocess);
27         hook(type => "sessioncgi", id => 'comment', call => \&sessioncgi);
28         hook(type => "htmlize", id => "_comment", call => \&htmlize);
29         hook(type => "htmlize", id => "_comment_pending",
30                 call => \&htmlize_pending);
31         hook(type => "pagetemplate", id => "comments", call => \&pagetemplate);
32         hook(type => "formbuilder_setup", id => "comments",
33                 call => \&formbuilder_setup);
34         # Load goto to fix up user page links for logged-in commenters
35         IkiWiki::loadplugin("goto");
36         IkiWiki::loadplugin("inline");
37 }
38
39 sub getsetup () {
40         return
41                 plugin => {
42                         safe => 1,
43                         rebuild => 1,
44                         section => "web",
45                 },
46                 comments_pagespec => {
47                         type => 'pagespec',
48                         example => 'blog/* and !*/Discussion',
49                         description => 'PageSpec of pages where comments are allowed',
50                         link => 'ikiwiki/PageSpec',
51                         safe => 1,
52                         rebuild => 1,
53                 },
54                 comments_closed_pagespec => {
55                         type => 'pagespec',
56                         example => 'blog/controversial or blog/flamewar',
57                         description => 'PageSpec of pages where posting new comments is not allowed',
58                         link => 'ikiwiki/PageSpec',
59                         safe => 1,
60                         rebuild => 1,
61                 },
62                 comments_pagename => {
63                         type => 'string',
64                         default => 'comment_',
65                         description => 'Base name for comments, e.g. "comment_" for pages like "sandbox/comment_12"',
66                         safe => 0, # manual page moving required
67                         rebuild => undef,
68                 },
69                 comments_allowdirectives => {
70                         type => 'boolean',
71                         example => 0,
72                         description => 'Interpret directives in comments?',
73                         safe => 1,
74                         rebuild => 0,
75                 },
76                 comments_allowauthor => {
77                         type => 'boolean',
78                         example => 0,
79                         description => 'Allow anonymous commenters to set an author name?',
80                         safe => 1,
81                         rebuild => 0,
82                 },
83                 comments_commit => {
84                         type => 'boolean',
85                         example => 1,
86                         description => 'commit comments to the VCS',
87                         # old uncommitted comments are likely to cause
88                         # confusion if this is changed
89                         safe => 0,
90                         rebuild => 0,
91                 },
92 }
93
94 sub checkconfig () {
95         $config{comments_commit} = 1
96                 unless defined $config{comments_commit};
97         $config{comments_pagespec} = ''
98                 unless defined $config{comments_pagespec};
99         $config{comments_closed_pagespec} = ''
100                 unless defined $config{comments_closed_pagespec};
101         $config{comments_pagename} = 'comment_'
102                 unless defined $config{comments_pagename};
103 }
104
105 sub htmlize {
106         my %params = @_;
107         return $params{content};
108 }
109
110 sub htmlize_pending {
111         my %params = @_;
112         return sprintf(gettext("this comment needs %s"),
113                 '<a href="'.
114                 IkiWiki::cgiurl(do => "commentmoderation").'">'.
115                 gettext("moderation").'</a>');
116 }
117
118 # FIXME: copied verbatim from meta
119 sub safeurl ($) {
120         my $url=shift;
121         if (exists $IkiWiki::Plugin::htmlscrubber::{safe_url_regexp} &&
122             defined $IkiWiki::Plugin::htmlscrubber::safe_url_regexp) {
123                 return $url=~/$IkiWiki::Plugin::htmlscrubber::safe_url_regexp/;
124         }
125         else {
126                 return 1;
127         }
128 }
129
130 sub preprocess {
131         my %params = @_;
132         my $page = $params{page};
133
134         my $format = $params{format};
135         if (defined $format && ! exists $IkiWiki::hooks{htmlize}{$format}) {
136                 error(sprintf(gettext("unsupported page format %s"), $format));
137         }
138
139         my $content = $params{content};
140         if (! defined $content) {
141                 error(gettext("comment must have content"));
142         }
143         $content =~ s/\\"/"/g;
144
145         $content = IkiWiki::filter($page, $params{destpage}, $content);
146
147         if ($config{comments_allowdirectives}) {
148                 $content = IkiWiki::preprocess($page, $params{destpage},
149                         $content);
150         }
151
152         # no need to bother with htmlize if it's just HTML
153         $content = IkiWiki::htmlize($page, $params{destpage}, $format, $content)
154                 if defined $format;
155
156         IkiWiki::run_hooks(sanitize => sub {
157                 $content = shift->(
158                         page => $page,
159                         destpage => $params{destpage},
160                         content => $content,
161                 );
162         });
163
164         # set metadata, possibly overriding [[!meta]] directives from the
165         # comment itself
166
167         my $commentuser;
168         my $commentip;
169         my $commentauthor;
170         my $commentauthorurl;
171         my $commentopenid;
172         if (defined $params{username}) {
173                 $commentuser = $params{username};
174
175                 my $oiduser = eval { IkiWiki::openiduser($commentuser) };
176
177                 if (defined $oiduser) {
178                         # looks like an OpenID
179                         $commentauthorurl = $commentuser;
180                         $commentauthor = $oiduser;
181                         $commentopenid = $commentuser;
182                 }
183                 else {
184                         $commentauthorurl = IkiWiki::cgiurl(
185                                 do => 'goto',
186                                 page => IkiWiki::userpage($commentuser)
187                         );
188
189                         $commentauthor = $commentuser;
190                 }
191         }
192         else {
193                 if (defined $params{ip}) {
194                         $commentip = $params{ip};
195                 }
196                 $commentauthor = gettext("Anonymous");
197         }
198
199         $commentstate{$page}{commentuser} = $commentuser;
200         $commentstate{$page}{commentopenid} = $commentopenid;
201         $commentstate{$page}{commentip} = $commentip;
202         $commentstate{$page}{commentauthor} = $commentauthor;
203         $commentstate{$page}{commentauthorurl} = $commentauthorurl;
204         if (! defined $pagestate{$page}{meta}{author}) {
205                 $pagestate{$page}{meta}{author} = $commentauthor;
206         }
207         if (! defined $pagestate{$page}{meta}{authorurl}) {
208                 $pagestate{$page}{meta}{authorurl} = $commentauthorurl;
209         }
210
211         if ($config{comments_allowauthor}) {
212                 if (defined $params{claimedauthor}) {
213                         $pagestate{$page}{meta}{author} = $params{claimedauthor};
214                 }
215
216                 if (defined $params{url}) {
217                         my $url=$params{url};
218
219                         eval q{use URI::Heuristic}; 
220                         if (! $@) {
221                                 $url=URI::Heuristic::uf_uristr($url);
222                         }
223
224                         if (safeurl($url)) {
225                                 $pagestate{$page}{meta}{authorurl} = $url;
226                         }
227                 }
228         }
229         else {
230                 $pagestate{$page}{meta}{author} = $commentauthor;
231                 $pagestate{$page}{meta}{authorurl} = $commentauthorurl;
232         }
233
234         if (defined $params{subject}) {
235                 # decode title the same way meta does
236                 eval q{use HTML::Entities};
237                 $pagestate{$page}{meta}{title} = decode_entities($params{subject});
238         }
239
240         if ($params{page} =~ m/\/\Q$config{comments_pagename}\E\d+_/) {
241                 $pagestate{$page}{meta}{permalink} = urlto(IkiWiki::dirname($params{page}), undef, 1).
242                         "#".page_to_id($params{page});
243         }
244
245         eval q{use Date::Parse};
246         if (! $@) {
247                 my $time = str2time($params{date});
248                 $IkiWiki::pagectime{$page} = $time if defined $time;
249         }
250
251         return $content;
252 }
253
254 sub sessioncgi ($$) {
255         my $cgi=shift;
256         my $session=shift;
257
258         my $do = $cgi->param('do');
259         if ($do eq 'comment') {
260                 editcomment($cgi, $session);
261         }
262         elsif ($do eq 'commentmoderation') {
263                 commentmoderation($cgi, $session);
264         }
265         elsif ($do eq 'commentsignin') {
266                 IkiWiki::cgi_signin($cgi, $session);
267                 exit;
268         }
269 }
270
271 # Mostly cargo-culted from IkiWiki::plugin::editpage
272 sub editcomment ($$) {
273         my $cgi=shift;
274         my $session=shift;
275
276         IkiWiki::decode_cgi_utf8($cgi);
277
278         eval q{use CGI::FormBuilder};
279         error($@) if $@;
280
281         my @buttons = (POST_COMMENT, PREVIEW, CANCEL);
282         my $form = CGI::FormBuilder->new(
283                 fields => [qw{do sid page subject editcontent type author url}],
284                 charset => 'utf-8',
285                 method => 'POST',
286                 required => [qw{editcontent}],
287                 javascript => 0,
288                 params => $cgi,
289                 action => $config{cgiurl},
290                 header => 0,
291                 table => 0,
292                 template => { template('editcomment.tmpl') },
293         );
294
295         IkiWiki::decode_form_utf8($form);
296         IkiWiki::run_hooks(formbuilder_setup => sub {
297                         shift->(title => "comment", form => $form, cgi => $cgi,
298                                 session => $session, buttons => \@buttons);
299                 });
300         IkiWiki::decode_form_utf8($form);
301
302         my $type = $form->param('type');
303         if (defined $type && length $type && $IkiWiki::hooks{htmlize}{$type}) {
304                 $type = IkiWiki::possibly_foolish_untaint($type);
305         }
306         else {
307                 $type = $config{default_pageext};
308         }
309
310
311         my @page_types;
312         if (exists $IkiWiki::hooks{htmlize}) {
313                 foreach my $key (grep { !/^_/ } keys %{$IkiWiki::hooks{htmlize}}) {
314                         push @page_types, [$key, $IkiWiki::hooks{htmlize}{$key}{longname} || $key];
315                 }
316         }
317         @page_types=sort @page_types;
318
319         $form->field(name => 'do', type => 'hidden');
320         $form->field(name => 'sid', type => 'hidden', value => $session->id,
321                 force => 1);
322         $form->field(name => 'page', type => 'hidden');
323         $form->field(name => 'subject', type => 'text', size => 72);
324         $form->field(name => 'editcontent', type => 'textarea', rows => 10);
325         $form->field(name => "type", value => $type, force => 1,
326                 type => 'select', options => \@page_types);
327
328         $form->tmpl_param(username => $session->param('name'));
329
330         if ($config{comments_allowauthor} and
331             ! defined $session->param('name')) {
332                 $form->tmpl_param(allowauthor => 1);
333                 $form->field(name => 'author', type => 'text', size => '40');
334                 $form->field(name => 'url', type => 'text', size => '40');
335         }
336         else {
337                 $form->tmpl_param(allowauthor => 0);
338                 $form->field(name => 'author', type => 'hidden', value => '',
339                         force => 1);
340                 $form->field(name => 'url', type => 'hidden', value => '',
341                         force => 1);
342         }
343
344         if (! defined $session->param('name')) {
345                 # Make signinurl work and return here.
346                 $form->tmpl_param(signinurl => IkiWiki::cgiurl(do => 'commentsignin'));
347                 $session->param(postsignin => $ENV{QUERY_STRING});
348                 IkiWiki::cgi_savesession($session);
349         }
350
351         # The untaint is OK (as in editpage) because we're about to pass
352         # it to file_pruned anyway
353         my $page = $form->field('page');
354         $page = IkiWiki::possibly_foolish_untaint($page);
355         if (! defined $page || ! length $page ||
356                 IkiWiki::file_pruned($page)) {
357                 error(gettext("bad page name"));
358         }
359
360         my $baseurl = urlto($page, undef, 1);
361
362         $form->title(sprintf(gettext("commenting on %s"),
363                         IkiWiki::pagetitle($page)));
364
365         $form->tmpl_param('helponformattinglink',
366                 htmllink($page, $page, 'ikiwiki/formatting',
367                         noimageinline => 1,
368                         linktext => 'FormattingHelp'),
369                         allowdirectives => $config{allow_directives});
370
371         if ($form->submitted eq CANCEL) {
372                 # bounce back to the page they wanted to comment on, and exit.
373                 # CANCEL need not be considered in future
374                 IkiWiki::redirect($cgi, urlto($page, undef, 1));
375                 exit;
376         }
377
378         if (not exists $pagesources{$page}) {
379                 error(sprintf(gettext(
380                         "page '%s' doesn't exist, so you can't comment"),
381                         $page));
382         }
383
384         if (pagespec_match($page, $config{comments_closed_pagespec},
385                 location => $page)) {
386                 error(sprintf(gettext(
387                         "comments on page '%s' are closed"),
388                         $page));
389         }
390
391         # Set a flag to indicate that we're posting a comment,
392         # so that postcomment() can tell it should match.
393         $postcomment=1;
394         IkiWiki::check_canedit($page, $cgi, $session);
395         $postcomment=0;
396
397         my $content = "[[!comment format=$type\n";
398
399         # FIXME: handling of double quotes probably wrong?
400         if (defined $session->param('name')) {
401                 my $username = $session->param('name');
402                 $username =~ s/"/&quot;/g;
403                 $content .= " username=\"$username\"\n";
404         }
405         elsif (defined $ENV{REMOTE_ADDR}) {
406                 my $ip = $ENV{REMOTE_ADDR};
407                 if ($ip =~ m/^([.0-9]+)$/) {
408                         $content .= " ip=\"$1\"\n";
409                 }
410         }
411
412         if ($config{comments_allowauthor}) {
413                 my $author = $form->field('author');
414                 if (defined $author && length $author) {
415                         $author =~ s/"/&quot;/g;
416                         $content .= " claimedauthor=\"$author\"\n";
417                 }
418                 my $url = $form->field('url');
419                 if (defined $url && length $url) {
420                         $url =~ s/"/&quot;/g;
421                         $content .= " url=\"$url\"\n";
422                 }
423         }
424
425         my $subject = $form->field('subject');
426         if (defined $subject && length $subject) {
427                 $subject =~ s/"/&quot;/g;
428         }
429         else {
430                 $subject = "comment ".(num_comments($page, $config{srcdir}) + 1);
431         }
432         $content .= " subject=\"$subject\"\n";
433
434         $content .= " date=\"" . decode_utf8(strftime('%Y-%m-%dT%H:%M:%SZ', gmtime)) . "\"\n";
435
436         my $editcontent = $form->field('editcontent') || '';
437         $editcontent =~ s/\r\n/\n/g;
438         $editcontent =~ s/\r/\n/g;
439         $editcontent =~ s/"/\\"/g;
440         $content .= " content=\"\"\"\n$editcontent\n\"\"\"]]\n";
441
442         my $location=unique_comment_location($page, $content, $config{srcdir});
443
444         # This is essentially a simplified version of editpage:
445         # - the user does not control the page that's created, only the parent
446         # - it's always a create operation, never an edit
447         # - this means that conflicts should never happen
448         # - this means that if they do, rocks fall and everyone dies
449
450         if ($form->submitted eq PREVIEW) {
451                 my $preview=previewcomment($content, $location, $page, time);
452                 IkiWiki::run_hooks(format => sub {
453                         $preview = shift->(page => $page,
454                                 content => $preview);
455                 });
456                 $form->tmpl_param(page_preview => $preview);
457         }
458         else {
459                 $form->tmpl_param(page_preview => "");
460         }
461
462         if ($form->submitted eq POST_COMMENT && $form->validate) {
463                 IkiWiki::checksessionexpiry($cgi, $session);
464                 
465                 $postcomment=1;
466                 my $ok=IkiWiki::check_content(content => $form->field('editcontent'),
467                         subject => $form->field('subject'),
468                         $config{comments_allowauthor} ? (
469                                 author => $form->field('author'),
470                                 url => $form->field('url'),
471                         ) : (),
472                         page => $location,
473                         cgi => $cgi,
474                         session => $session,
475                         nonfatal => 1,
476                 );
477                 $postcomment=0;
478
479                 if (! $ok) {
480                         $location=unique_comment_location($page, $content, $config{srcdir}, "._comment_pending");
481                         writefile("$location._comment_pending", $config{srcdir}, $content);
482
483                         # Refresh so anything that deals with pending
484                         # comments can be updated.
485                         require IkiWiki::Render;
486                         IkiWiki::refresh();
487                         IkiWiki::saveindex();
488
489                         IkiWiki::printheader($session);
490                         print IkiWiki::misctemplate(gettext(gettext("comment stored for moderation")),
491                                 "<p>".
492                                 gettext("Your comment will be posted after moderator review").
493                                 "</p>");
494                         exit;
495                 }
496
497                 # FIXME: could probably do some sort of graceful retry
498                 # on error? Would require significant unwinding though
499                 my $file = "$location._comment";
500                 writefile($file, $config{srcdir}, $content);
501
502                 my $conflict;
503
504                 if ($config{rcs} and $config{comments_commit}) {
505                         my $message = gettext("Added a comment");
506                         if (defined $form->field('subject') &&
507                                 length $form->field('subject')) {
508                                 $message = sprintf(
509                                         gettext("Added a comment: %s"),
510                                         $form->field('subject'));
511                         }
512
513                         IkiWiki::rcs_add($file);
514                         IkiWiki::disable_commit_hook();
515                         $conflict = IkiWiki::rcs_commit_staged($message,
516                                 $session->param('name'), $ENV{REMOTE_ADDR});
517                         IkiWiki::enable_commit_hook();
518                         IkiWiki::rcs_update();
519                 }
520
521                 # Now we need a refresh
522                 require IkiWiki::Render;
523                 IkiWiki::refresh();
524                 IkiWiki::saveindex();
525
526                 # this should never happen, unless a committer deliberately
527                 # breaks it or something
528                 error($conflict) if defined $conflict;
529
530                 # Jump to the new comment on the page.
531                 # The trailing question mark tries to avoid broken
532                 # caches and get the most recent version of the page.
533                 IkiWiki::redirect($cgi, urlto($page, undef, 1).
534                         "?updated#".page_to_id($location));
535
536         }
537         else {
538                 IkiWiki::showform ($form, \@buttons, $session, $cgi,
539                         forcebaseurl => $baseurl);
540         }
541
542         exit;
543 }
544
545 sub commentmoderation ($$) {
546         my $cgi=shift;
547         my $session=shift;
548
549         IkiWiki::needsignin($cgi, $session);
550         if (! IkiWiki::is_admin($session->param("name"))) {
551                 error(gettext("you are not logged in as an admin"));
552         }
553
554         IkiWiki::decode_cgi_utf8($cgi);
555         
556         if (defined $cgi->param('sid')) {
557                 IkiWiki::checksessionexpiry($cgi, $session);
558
559                 my $rejectalldefer=$cgi->param('rejectalldefer');
560
561                 my %vars=$cgi->Vars;
562                 my $added=0;
563                 foreach my $id (keys %vars) {
564                         if ($id =~ /(.*)\._comment(?:_pending)?$/) {
565                                 my $action=$cgi->param($id);
566                                 next if $action eq 'Defer' && ! $rejectalldefer;
567
568                                 # Make sure that the id is of a legal
569                                 # pending comment.
570                                 my ($f) = $id =~ /$config{wiki_file_regexp}/;
571                                 if (! defined $f || ! length $f ||
572                                     IkiWiki::file_pruned($f)) {
573                                         error("illegal file");
574                                 }
575
576                                 my $page=IkiWiki::dirname($f);
577                                 my $file="$config{srcdir}/$f";
578                                 if (! -e $file) {
579                                         # old location
580                                         $file="$config{wikistatedir}/comments_pending/".$f;
581                                 }
582
583                                 if ($action eq 'Accept') {
584                                         my $content=eval { readfile($file) };
585                                         next if $@; # file vanished since form was displayed
586                                         my $dest=unique_comment_location($page, $content, $config{srcdir})."._comment";
587                                         writefile($dest, $config{srcdir}, $content);
588                                         if ($config{rcs} and $config{comments_commit}) {
589                                                 IkiWiki::rcs_add($dest);
590                                         }
591                                         $added++;
592                                 }
593
594                                 require IkiWiki::Render;
595                                 IkiWiki::prune($file);
596                         }
597                 }
598
599                 if ($added) {
600                         my $conflict;
601                         if ($config{rcs} and $config{comments_commit}) {
602                                 my $message = gettext("Comment moderation");
603                                 IkiWiki::disable_commit_hook();
604                                 $conflict=IkiWiki::rcs_commit_staged($message,
605                                         $session->param('name'), $ENV{REMOTE_ADDR});
606                                 IkiWiki::enable_commit_hook();
607                                 IkiWiki::rcs_update();
608                         }
609                 
610                         # Now we need a refresh
611                         require IkiWiki::Render;
612                         IkiWiki::refresh();
613                         IkiWiki::saveindex();
614                 
615                         error($conflict) if defined $conflict;
616                 }
617         }
618
619         my @comments=map {
620                 my ($id, $dir, $ctime)=@{$_};
621                 my $content=readfile("$dir/$id");
622                 my $preview=previewcomment($content, $id,
623                         $id, $ctime);
624                 {
625                         id => $id,
626                         view => $preview,
627                 }
628         } sort { $b->[2] <=> $a->[2] } comments_pending();
629
630         my $template=template("commentmoderation.tmpl");
631         $template->param(
632                 sid => $session->id,
633                 comments => \@comments,
634         );
635         IkiWiki::printheader($session);
636         my $out=$template->output;
637         IkiWiki::run_hooks(format => sub {
638                 $out = shift->(page => "", content => $out);
639         });
640         print IkiWiki::misctemplate(gettext("comment moderation"), $out);
641         exit;
642 }
643
644 sub formbuilder_setup (@) {
645         my %params=@_;
646
647         my $form=$params{form};
648         if ($form->title eq "preferences" &&
649             IkiWiki::is_admin($params{session}->param("name"))) {
650                 push @{$params{buttons}}, "Comment Moderation";
651                 if ($form->submitted && $form->submitted eq "Comment Moderation") {
652                         commentmoderation($params{cgi}, $params{session});
653                 }
654         }
655 }
656
657 sub comments_pending () {
658         my @ret;
659
660         eval q{use File::Find};
661         error($@) if $@;
662
663         my $find_comments=sub {
664                 my $dir=shift;
665                 my $extension=shift;
666                 return unless -d $dir;
667                 find({
668                         no_chdir => 1,
669                         wanted => sub {
670                                 my $file=decode_utf8($_);
671                                 $file=~s/^\Q$dir\E\/?//;
672                                 return if ! length $file || IkiWiki::file_pruned($file)
673                                         || -l $_ || -d _ || $file !~ /\Q$extension\E$/;
674                                 my ($f) = $file =~ /$config{wiki_file_regexp}/; # untaint
675                                 if (defined $f) {
676                                         my $ctime=(stat($_))[10];
677                                         push @ret, [$f, $dir, $ctime];
678                                 }
679                         }
680                 }, $dir);
681         };
682         
683         $find_comments->($config{srcdir}, "._comment_pending");
684         # old location
685         $find_comments->("$config{wikistatedir}/comments_pending/",
686                 "._comment");
687
688         return @ret;
689 }
690
691 sub previewcomment ($$$) {
692         my $content=shift;
693         my $location=shift;
694         my $page=shift;
695         my $time=shift;
696
697         my $preview = IkiWiki::htmlize($location, $page, '_comment',
698                         IkiWiki::linkify($location, $page,
699                         IkiWiki::preprocess($location, $page,
700                         IkiWiki::filter($location, $page, $content), 0, 1)));
701
702         my $template = template("comment.tmpl");
703         $template->param(content => $preview);
704         $template->param(ctime => displaytime($time, undef, 1));
705         $template->param(html5 => $config{html5});
706
707         IkiWiki::run_hooks(pagetemplate => sub {
708                 shift->(page => $location,
709                         destpage => $page,
710                         template => $template);
711         });
712
713         $template->param(have_actions => 0);
714
715         return $template->output;
716 }
717
718 sub commentsshown ($) {
719         my $page=shift;
720
721         return ! pagespec_match($page, "comment(*)",
722                                 location => $page) &&
723                pagespec_match($page, $config{comments_pagespec},
724                               location => $page);
725 }
726
727 sub commentsopen ($) {
728         my $page = shift;
729
730         return length $config{cgiurl} > 0 &&
731                (! length $config{comments_closed_pagespec} ||
732                 ! pagespec_match($page, $config{comments_closed_pagespec},
733                                  location => $page));
734 }
735
736 sub pagetemplate (@) {
737         my %params = @_;
738
739         my $page = $params{page};
740         my $template = $params{template};
741         my $shown = ($template->query(name => 'commentslink') ||
742                      $template->query(name => 'commentsurl') ||
743                      $template->query(name => 'atomcommentsurl') ||
744                      $template->query(name => 'comments')) &&
745                     commentsshown($page);
746
747         if ($template->query(name => 'comments')) {
748                 my $comments = undef;
749                 if ($shown) {
750                         $comments = IkiWiki::preprocess_inline(
751                                 pages => "comment($page)",
752                                 template => 'comment',
753                                 show => 0,
754                                 reverse => 'yes',
755                                 page => $page,
756                                 destpage => $params{destpage},
757                                 feedfile => 'comments',
758                                 emptyfeeds => 'no',
759                         );
760                 }
761
762                 if (defined $comments && length $comments) {
763                         $template->param(comments => $comments);
764                 }
765
766                 if ($shown && commentsopen($page)) {
767                         $template->param(addcommenturl => addcommenturl($page));
768                 }
769         }
770
771         if ($shown) {
772                 if ($template->query(name => 'commentsurl')) {
773                         $template->param(commentsurl =>
774                                 urlto($page, undef, 1).'#comments');
775                 }
776
777                 if ($template->query(name => 'atomcommentsurl') && $config{usedirs}) {
778                         # This will 404 until there are some comments, but I
779                         # think that's probably OK...
780                         $template->param(atomcommentsurl =>
781                                 urlto($page, undef, 1).'comments.atom');
782                 }
783
784                 if ($template->query(name => 'commentslink')) {
785                         my $num=num_comments($page, $config{srcdir});
786                         my $link;
787                         if ($num > 0) {
788                                 $link = htmllink($page, $params{destpage}, $page,
789                                         linktext => sprintf(ngettext("%i comment", "%i comments", $num), $num),
790                                         anchor => "comments",
791                                         noimageinline => 1
792                                 );
793                         }
794                         elsif (commentsopen($page)) {
795                                 $link = "<a href=\"".addcommenturl($page)."\">".
796                                         #translators: Here "Comment" is a verb;
797                                         #translators: the user clicks on it to
798                                         #translators: post a comment.
799                                         gettext("Comment").
800                                         "</a>";
801                         }
802                         $template->param(commentslink => $link)
803                                 if defined $link;
804                 }
805         }
806
807         # everything below this point is only relevant to the comments
808         # themselves
809         if (!exists $commentstate{$page}) {
810                 return;
811         }
812         
813         if ($template->query(name => 'commentid')) {
814                 $template->param(commentid => page_to_id($page));
815         }
816
817         if ($template->query(name => 'commentuser')) {
818                 $template->param(commentuser =>
819                         $commentstate{$page}{commentuser});
820         }
821
822         if ($template->query(name => 'commentopenid')) {
823                 $template->param(commentopenid =>
824                         $commentstate{$page}{commentopenid});
825         }
826
827         if ($template->query(name => 'commentip')) {
828                 $template->param(commentip =>
829                         $commentstate{$page}{commentip});
830         }
831
832         if ($template->query(name => 'commentauthor')) {
833                 $template->param(commentauthor =>
834                         $commentstate{$page}{commentauthor});
835         }
836
837         if ($template->query(name => 'commentauthorurl')) {
838                 $template->param(commentauthorurl =>
839                         $commentstate{$page}{commentauthorurl});
840         }
841
842         if ($template->query(name => 'removeurl') &&
843             IkiWiki::Plugin::remove->can("check_canremove") &&
844             length $config{cgiurl}) {
845                 $template->param(removeurl => IkiWiki::cgiurl(do => 'remove',
846                         page => $page));
847                 $template->param(have_actions => 1);
848         }
849 }
850
851 sub addcommenturl ($) {
852         my $page=shift;
853
854         return IkiWiki::cgiurl(do => 'comment', page => $page);
855 }
856
857 sub num_comments ($$) {
858         my $page=shift;
859         my $dir=shift;
860
861         my @comments=glob("$dir/$page/$config{comments_pagename}*._comment");
862         return @comments;
863 }
864
865 sub unique_comment_location ($$$$) {
866         my $page=shift;
867         eval q{use Digest::MD5 'md5_hex'};
868         error($@) if $@;
869         my $content_md5=md5_hex(Encode::encode_utf8(shift));
870         my $dir=shift;
871         my $ext=shift || "._comment";
872
873         my $location;
874         my $i = num_comments($page, $dir);
875         do {
876                 $i++;
877                 $location = "$page/$config{comments_pagename}${i}_${content_md5}";
878         } while (-e "$dir/$location$ext");
879
880         return $location;
881 }
882
883 sub page_to_id ($) {
884         # Converts a comment page name into a unique, legal html id
885         # attribute value, that can be used as an anchor to link to the
886         # comment.
887         my $page=shift;
888
889         eval q{use Digest::MD5 'md5_hex'};
890         error($@) if $@;
891
892         return "comment-".md5_hex(Encode::encode_utf8(($page)));
893 }
894         
895 package IkiWiki::PageSpec;
896
897 sub match_postcomment ($$;@) {
898         my $page = shift;
899         my $glob = shift;
900
901         if (! $postcomment) {
902                 return IkiWiki::FailReason->new("not posting a comment");
903         }
904         return match_glob($page, $glob, @_);
905 }
906
907 sub match_comment ($$;@) {
908         my $page = shift;
909         my $glob = shift;
910
911         if (! IkiWiki::isinternal($page)) {
912                 return IkiWiki::FailReason->new("$page is not a comment");
913         }
914         my $type=IkiWiki::pagetype($IkiWiki::pagesources{$page});
915         if (defined $type && $type ne "_comment") {
916                 return IkiWiki::FailReason->new("$page is not a comment");
917         }
918
919         return match_glob($page, "$glob/*", internal => 1, @_);
920 }
921
922 sub match_comment_pending ($$;@) {
923         my $page = shift;
924         my $glob = shift;
925         
926         if (! IkiWiki::isinternal($page)) {
927                 return IkiWiki::FailReason->new("$page is not a pending comment");
928         }
929         my $type=IkiWiki::pagetype($IkiWiki::pagesources{$page});
930         if (defined $type && $type ne "_comment_pending") {
931                 return IkiWiki::FailReason->new("$page is not a pending comment");
932         }
933
934         return match_glob($page, "$glob/*", internal => 1, @_);
935 }
936
937 1