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="" if ! defined $editcontent;
 438         $editcontent =~ s/\r\n/\n/g;
 439         $editcontent =~ s/\r/\n/g;
 440         $editcontent =~ s/"/\\"/g;
 441         $content .= " content=\"\"\"\n$editcontent\n\"\"\"]]\n";
 442
 443         my $location=unique_comment_location($page, $content, $config{srcdir});
 444
 445         # This is essentially a simplified version of editpage:
 446         # - the user does not control the page that's created, only the parent
 447         # - it's always a create operation, never an edit
 448         # - this means that conflicts should never happen
 449         # - this means that if they do, rocks fall and everyone dies
 450
 451         if ($form->submitted eq PREVIEW) {
 452                 my $preview=previewcomment($content, $location, $page, time);
 453                 IkiWiki::run_hooks(format => sub {
 454                         $preview = shift->(page => $page,
 455                                 content => $preview);
 456                 });
 457                 $form->tmpl_param(page_preview => $preview);
 458         }
 459         else {
 460                 $form->tmpl_param(page_preview => "");
 461         }
 462
 463         if ($form->submitted eq POST_COMMENT && $form->validate) {
 464                 IkiWiki::checksessionexpiry($cgi, $session);
 465
 466                 $postcomment=1;
 467                 my $ok=IkiWiki::check_content(content => $form->field('editcontent'),
 468                         subject => $form->field('subject'),
 469                         $config{comments_allowauthor} ? (
 470                                 author => $form->field('author'),
 471                                 url => $form->field('url'),
 472                         ) : (),
 473                         page => $location,
 474                         cgi => $cgi,
 475                         session => $session,
 476                         nonfatal => 1,
 477                 );
 478                 $postcomment=0;
 479
 480                 if (! $ok) {
 481                         $location=unique_comment_location($page, $content, $config{srcdir}, "._comment_pending");
 482                         writefile("$location._comment_pending", $config{srcdir}, $content);
 483
 484                         # Refresh so anything that deals with pending
 485                         # comments can be updated.
 486                         require IkiWiki::Render;
 487                         IkiWiki::refresh();
 488                         IkiWiki::saveindex();
 489
 490                         IkiWiki::printheader($session);
 491                         print IkiWiki::misctemplate(gettext(gettext("comment stored for moderation")),
 492                                 "<p>".
 493                                 gettext("Your comment will be posted after moderator review").
 494                                 "</p>");
 495                         exit;
 496                 }
 497
 498                 # FIXME: could probably do some sort of graceful retry
 499                 # on error? Would require significant unwinding though
 500                 my $file = "$location._comment";
 501                 writefile($file, $config{srcdir}, $content);
 502
 503                 my $conflict;
 504
 505                 if ($config{rcs} and $config{comments_commit}) {
 506                         my $message = gettext("Added a comment");
 507                         if (defined $form->field('subject') &&
 508                                 length $form->field('subject')) {
 509                                 $message = sprintf(
 510                                         gettext("Added a comment: %s"),
 511                                         $form->field('subject'));
 512                         }
 513
 514                         IkiWiki::rcs_add($file);
 515                         IkiWiki::disable_commit_hook();
 516                         $conflict = IkiWiki::rcs_commit_staged($message,
 517                                 $session->param('name'), $ENV{REMOTE_ADDR});
 518                         IkiWiki::enable_commit_hook();
 519                         IkiWiki::rcs_update();
 520                 }
 521
 522                 # Now we need a refresh
 523                 require IkiWiki::Render;
 524                 IkiWiki::refresh();
 525                 IkiWiki::saveindex();
 526
 527                 # this should never happen, unless a committer deliberately
 528                 # breaks it or something
 529                 error($conflict) if defined $conflict;
 530
 531                 # Jump to the new comment on the page.
 532                 # The trailing question mark tries to avoid broken
 533                 # caches and get the most recent version of the page.
 534                 IkiWiki::redirect($cgi, urlto($page, undef, 1).
 535                         "?updated#".page_to_id($location));
 536
 537         }
 538         else {
 539                 IkiWiki::showform ($form, \@buttons, $session, $cgi,
 540                         forcebaseurl => $baseurl, page => $page);
 541         }
 542
 543         exit;
 544 }
 545
 546 sub commentmoderation ($$) {
 547         my $cgi=shift;
 548         my $session=shift;
 549
 550         IkiWiki::needsignin($cgi, $session);
 551         if (! IkiWiki::is_admin($session->param("name"))) {
 552                 error(gettext("you are not logged in as an admin"));
 553         }
 554
 555         IkiWiki::decode_cgi_utf8($cgi);
 556
 557         if (defined $cgi->param('sid')) {
 558                 IkiWiki::checksessionexpiry($cgi, $session);
 559
 560                 my $rejectalldefer=$cgi->param('rejectalldefer');
 561
 562                 my %vars=$cgi->Vars;
 563                 my $added=0;
 564                 foreach my $id (keys %vars) {
 565                         if ($id =~ /(.*)\._comment(?:_pending)?$/) {
 566                                 my $action=$cgi->param($id);
 567                                 next if $action eq 'Defer' && ! $rejectalldefer;
 568
 569                                 # Make sure that the id is of a legal
 570                                 # pending comment.
 571                                 my ($f) = $id =~ /$config{wiki_file_regexp}/;
 572                                 if (! defined $f || ! length $f ||
 573                                     IkiWiki::file_pruned($f)) {
 574                                         error("illegal file");
 575                                 }
 576
 577                                 my $page=IkiWiki::dirname($f);
 578                                 my $file="$config{srcdir}/$f";
 579                                 if (! -e $file) {
 580                                         # old location
 581                                         $file="$config{wikistatedir}/comments_pending/".$f;
 582                                 }
 583
 584                                 if ($action eq 'Accept') {
 585                                         my $content=eval { readfile($file) };
 586                                         next if $@; # file vanished since form was displayed
 587                                         my $dest=unique_comment_location($page, $content, $config{srcdir})."._comment";
 588                                         writefile($dest, $config{srcdir}, $content);
 589                                         if ($config{rcs} and $config{comments_commit}) {
 590                                                 IkiWiki::rcs_add($dest);
 591                                         }
 592                                         $added++;
 593                                 }
 594
 595                                 require IkiWiki::Render;
 596                                 IkiWiki::prune($file);
 597                         }
 598                 }
 599
 600                 if ($added) {
 601                         my $conflict;
 602                         if ($config{rcs} and $config{comments_commit}) {
 603                                 my $message = gettext("Comment moderation");
 604                                 IkiWiki::disable_commit_hook();
 605                                 $conflict=IkiWiki::rcs_commit_staged($message,
 606                                         $session->param('name'), $ENV{REMOTE_ADDR});
 607                                 IkiWiki::enable_commit_hook();
 608                                 IkiWiki::rcs_update();
 609                         }
 610
 611                         # Now we need a refresh
 612                         require IkiWiki::Render;
 613                         IkiWiki::refresh();
 614                         IkiWiki::saveindex();
 615
 616                         error($conflict) if defined $conflict;
 617                 }
 618         }
 619
 620         my @comments=map {
 621                 my ($id, $dir, $ctime)=@{$_};
 622                 my $content=readfile("$dir/$id");
 623                 my $preview=previewcomment($content, $id,
 624                         $id, $ctime);
 625                 {
 626                         id => $id,
 627                         view => $preview,
 628                 }
 629         } sort { $b->[2] <=> $a->[2] } comments_pending();
 630
 631         my $template=template("commentmoderation.tmpl");
 632         $template->param(
 633                 sid => $session->id,
 634                 comments => \@comments,
 635         );
 636         IkiWiki::printheader($session);
 637         my $out=$template->output;
 638         IkiWiki::run_hooks(format => sub {
 639                 $out = shift->(page => "", content => $out);
 640         });
 641         print IkiWiki::misctemplate(gettext("comment moderation"), $out);
 642         exit;
 643 }
 644
 645 sub formbuilder_setup (@) {
 646         my %params=@_;
 647
 648         my $form=$params{form};
 649         if ($form->title eq "preferences" &&
 650             IkiWiki::is_admin($params{session}->param("name"))) {
 651                 push @{$params{buttons}}, "Comment Moderation";
 652                 if ($form->submitted && $form->submitted eq "Comment Moderation") {
 653                         commentmoderation($params{cgi}, $params{session});
 654                 }
 655         }
 656 }
 657
 658 sub comments_pending () {
 659         my @ret;
 660
 661         eval q{use File::Find};
 662         error($@) if $@;
 663         eval q{use Cwd};
 664         error($@) if $@;
 665         my $origdir=getcwd();
 666
 667         my $find_comments=sub {
 668                 my $dir=shift;
 669                 my $extension=shift;
 670                 return unless -d $dir;
 671
 672                 chdir($dir) || die "chdir $dir: $!";
 673
 674                 find({
 675                         no_chdir => 1,
 676                         wanted => sub {
 677                                 my $file=decode_utf8($_);
 678                                 $file=~s/^\.\///;
 679                                 return if ! length $file || IkiWiki::file_pruned($file)
 680                                         || -l $_ || -d _ || $file !~ /\Q$extension\E$/;
 681                                 my ($f) = $file =~ /$config{wiki_file_regexp}/; # untaint
 682                                 if (defined $f) {
 683                                         my $ctime=(stat($_))[10];
 684                                         push @ret, [$f, $dir, $ctime];
 685                                 }
 686                         }
 687                 }, ".");
 688
 689                 chdir($origdir) || die "chdir $origdir: $!";
 690         };
 691
 692         $find_comments->($config{srcdir}, "._comment_pending");
 693         # old location
 694         $find_comments->("$config{wikistatedir}/comments_pending/",
 695                 "._comment");
 696
 697         return @ret;
 698 }
 699
 700 sub previewcomment ($$$) {
 701         my $content=shift;
 702         my $location=shift;
 703         my $page=shift;
 704         my $time=shift;
 705
 706         my $preview = IkiWiki::htmlize($location, $page, '_comment',
 707                         IkiWiki::linkify($location, $page,
 708                         IkiWiki::preprocess($location, $page,
 709                         IkiWiki::filter($location, $page, $content), 0, 1)));
 710
 711         my $template = template("comment.tmpl");
 712         $template->param(content => $preview);
 713         $template->param(ctime => displaytime($time, undef, 1));
 714         $template->param(html5 => $config{html5});
 715
 716         IkiWiki::run_hooks(pagetemplate => sub {
 717                 shift->(page => $location,
 718                         destpage => $page,
 719                         template => $template);
 720         });
 721
 722         $template->param(have_actions => 0);
 723
 724         return $template->output;
 725 }
 726
 727 sub commentsshown ($) {
 728         my $page=shift;
 729
 730         return ! pagespec_match($page, "comment(*)",
 731                                 location => $page) &&
 732                pagespec_match($page, $config{comments_pagespec},
 733                               location => $page);
 734 }
 735
 736 sub commentsopen ($) {
 737         my $page = shift;
 738
 739         return length $config{cgiurl} > 0 &&
 740                (! length $config{comments_closed_pagespec} ||
 741                 ! pagespec_match($page, $config{comments_closed_pagespec},
 742                                  location => $page));
 743 }
 744
 745 sub pagetemplate (@) {
 746         my %params = @_;
 747
 748         my $page = $params{page};
 749         my $template = $params{template};
 750         my $shown = ($template->query(name => 'commentslink') ||
 751                      $template->query(name => 'commentsurl') ||
 752                      $template->query(name => 'atomcommentsurl') ||
 753                      $template->query(name => 'comments')) &&
 754                     commentsshown($page);
 755
 756         if ($template->query(name => 'comments')) {
 757                 my $comments = undef;
 758                 if ($shown) {
 759                         $comments = IkiWiki::preprocess_inline(
 760                                 pages => "comment($page)",
 761                                 template => 'comment',
 762                                 show => 0,
 763                                 reverse => 'yes',
 764                                 page => $page,
 765                                 destpage => $params{destpage},
 766                                 feedfile => 'comments',
 767                                 emptyfeeds => 'no',
 768                         );
 769                 }
 770
 771                 if (defined $comments && length $comments) {
 772                         $template->param(comments => $comments);
 773                 }
 774
 775                 if ($shown && commentsopen($page)) {
 776                         $template->param(addcommenturl => addcommenturl($page));
 777                 }
 778         }
 779
 780         if ($shown) {
 781                 if ($template->query(name => 'commentsurl')) {
 782                         $template->param(commentsurl =>
 783                                 urlto($page, undef, 1).'#comments');
 784                 }
 785
 786                 if ($template->query(name => 'atomcommentsurl') && $config{usedirs}) {
 787                         # This will 404 until there are some comments, but I
 788                         # think that's probably OK...
 789                         $template->param(atomcommentsurl =>
 790                                 urlto($page, undef, 1).'comments.atom');
 791                 }
 792
 793                 if ($template->query(name => 'commentslink')) {
 794                         my $num=num_comments($page, $config{srcdir});
 795                         my $link;
 796                         if ($num > 0) {
 797                                 $link = htmllink($page, $params{destpage}, $page,
 798                                         linktext => sprintf(ngettext("%i comment", "%i comments", $num), $num),
 799                                         anchor => "comments",
 800                                         noimageinline => 1
 801                                 );
 802                         }
 803                         elsif (commentsopen($page)) {
 804                                 $link = "<a href=\"".addcommenturl($page)."\">".
 805                                         #translators: Here "Comment" is a verb;
 806                                         #translators: the user clicks on it to
 807                                         #translators: post a comment.
 808                                         gettext("Comment").
 809                                         "</a>";
 810                         }
 811                         $template->param(commentslink => $link)
 812                                 if defined $link;
 813                 }
 814         }
 815
 816         # everything below this point is only relevant to the comments
 817         # themselves
 818         if (!exists $commentstate{$page}) {
 819                 return;
 820         }
 821
 822         if ($template->query(name => 'commentid')) {
 823                 $template->param(commentid => page_to_id($page));
 824         }
 825
 826         if ($template->query(name => 'commentuser')) {
 827                 $template->param(commentuser =>
 828                         $commentstate{$page}{commentuser});
 829         }
 830
 831         if ($template->query(name => 'commentopenid')) {
 832                 $template->param(commentopenid =>
 833                         $commentstate{$page}{commentopenid});
 834         }
 835
 836         if ($template->query(name => 'commentip')) {
 837                 $template->param(commentip =>
 838                         $commentstate{$page}{commentip});
 839         }
 840
 841         if ($template->query(name => 'commentauthor')) {
 842                 $template->param(commentauthor =>
 843                         $commentstate{$page}{commentauthor});
 844         }
 845
 846         if ($template->query(name => 'commentauthorurl')) {
 847                 $template->param(commentauthorurl =>
 848                         $commentstate{$page}{commentauthorurl});
 849         }
 850
 851         if ($template->query(name => 'removeurl') &&
 852             IkiWiki::Plugin::remove->can("check_canremove") &&
 853             length $config{cgiurl}) {
 854                 $template->param(removeurl => IkiWiki::cgiurl(do => 'remove',
 855                         page => $page));
 856                 $template->param(have_actions => 1);
 857         }
 858 }
 859
 860 sub addcommenturl ($) {
 861         my $page=shift;
 862
 863         return IkiWiki::cgiurl(do => 'comment', page => $page);
 864 }
 865
 866 sub num_comments ($$) {
 867         my $page=shift;
 868         my $dir=shift;
 869
 870         my @comments=glob("$dir/$page/$config{comments_pagename}*._comment");
 871         return int @comments;
 872 }
 873
 874 sub unique_comment_location ($$$$) {
 875         my $page=shift;
 876         eval q{use Digest::MD5 'md5_hex'};
 877         error($@) if $@;
 878         my $content_md5=md5_hex(Encode::encode_utf8(shift));
 879         my $dir=shift;
 880         my $ext=shift || "._comment";
 881
 882         my $location;
 883         my $i = num_comments($page, $dir);
 884         do {
 885                 $i++;
 886                 $location = "$page/$config{comments_pagename}${i}_${content_md5}";
 887         } while (-e "$dir/$location$ext");
 888
 889         return $location;
 890 }
 891
 892 sub page_to_id ($) {
 893         # Converts a comment page name into a unique, legal html id
 894         # attribute value, that can be used as an anchor to link to the
 895         # comment.
 896         my $page=shift;
 897
 898         eval q{use Digest::MD5 'md5_hex'};
 899         error($@) if $@;
 900
 901         return "comment-".md5_hex(Encode::encode_utf8(($page)));
 902 }
 903
 904 package IkiWiki::PageSpec;
 905
 906 sub match_postcomment ($$;@) {
 907         my $page = shift;
 908         my $glob = shift;
 909
 910         if (! $postcomment) {
 911                 return IkiWiki::FailReason->new("not posting a comment");
 912         }
 913         return match_glob($page, $glob, @_);
 914 }
 915
 916 sub match_comment ($$;@) {
 917         my $page = shift;
 918         my $glob = shift;
 919
 920         # To see if it's a comment, check the source file type.
 921         # Deal with comments that were just deleted.
 922         my $source=exists $IkiWiki::pagesources{$page} ?
 923                 $IkiWiki::pagesources{$page} :
 924                 $IkiWiki::delpagesources{$page};
 925         my $type=defined $source ? IkiWiki::pagetype($source) : undef;
 926         if (! defined $type || $type ne "_comment") {
 927                 return IkiWiki::FailReason->new("$page is not a comment");
 928         }
 929
 930         return match_glob($page, "$glob/*", internal => 1, @_);
 931 }
 932
 933 sub match_comment_pending ($$;@) {
 934         my $page = shift;
 935         my $glob = shift;
 936
 937         my $source=exists $IkiWiki::pagesources{$page} ?
 938                 $IkiWiki::pagesources{$page} :
 939                 $IkiWiki::delpagesources{$page};
 940         my $type=defined $source ? IkiWiki::pagetype($source) : undef;
 941         if (! defined $type || $type ne "_comment_pending") {
 942                 return IkiWiki::FailReason->new("$page is not a pending comment");
 943         }
 944
 945         return match_glob($page, "$glob/*", internal => 1, @_);
 946 }
 947
 948 1