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 2.00;
  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
  20 sub import { #{{{
  21         hook(type => "checkconfig", id => 'comments',  call => \&checkconfig);
  22         hook(type => "getsetup", id => 'comments',  call => \&getsetup);
  23         hook(type => "preprocess", id => '_comment', call => \&preprocess);
  24         hook(type => "sessioncgi", id => 'comment', call => \&sessioncgi);
  25         hook(type => "htmlize", id => "_comment", call => \&htmlize);
  26         hook(type => "pagetemplate", id => "comments", call => \&pagetemplate);
  27         hook(type => "cgi", id => "comments", call => \&linkcgi);
  28         IkiWiki::loadplugin("inline");
  29 } # }}}
  30
  31 sub getsetup () { #{{{
  32         return
  33                 plugin => {
  34                         safe => 1,
  35                         rebuild => 1,
  36                 },
  37                 # Pages where comments are shown, but new comments are not
  38                 # allowed, will show "Comments are closed".
  39                 comments_shown_pagespec => {
  40                         type => 'pagespec',
  41                         example => 'blog/*',
  42                         default => '',
  43                         description => 'PageSpec for pages where comments will be shown inline',
  44                         link => 'ikiwiki/PageSpec',
  45                         safe => 1,
  46                         rebuild => 1,
  47                 },
  48                 comments_open_pagespec => {
  49                         type => 'pagespec',
  50                         example => 'blog/* and created_after(close_old_comments)',
  51                         default => '',
  52                         description => 'PageSpec for pages where new comments can be posted',
  53                         link => 'ikiwiki/PageSpec',
  54                         safe => 1,
  55                         rebuild => 1,
  56                 },
  57                 comments_pagename => {
  58                         type => 'string',
  59                         example => 'comment_',
  60                         default => 'comment_',
  61                         description => 'Base name for comments, e.g. "comment_" for pages like "sandbox/comment_12"',
  62                         safe => 0, # manual page moving required
  63                         rebuild => undef,
  64                 },
  65                 comments_allowdirectives => {
  66                         type => 'boolean',
  67                         default => 0,
  68                         example => 0,
  69                         description => 'Interpret directives in comments?',
  70                         safe => 1,
  71                         rebuild => 0,
  72                 },
  73                 comments_allowauthor => {
  74                         type => 'boolean',
  75                         default => 0,
  76                         example => 0,
  77                         description => 'Allow anonymous commenters to set an author name?',
  78                         safe => 1,
  79                         rebuild => 0,
  80                 },
  81                 comments_commit => {
  82                         type => 'boolean',
  83                         example => 1,
  84                         default => 1,
  85                         description => 'commit comments to the VCS',
  86                         # old uncommitted comments are likely to cause
  87                         # confusion if this is changed
  88                         safe => 0,
  89                         rebuild => 0,
  90                 },
  91 } #}}}
  92
  93 sub htmlize { # {{{
  94         my %params = @_;
  95         return $params{content};
  96 } # }}}
  97
  98 # FIXME: copied verbatim from meta
  99 sub safeurl ($) { #{{{
 100         my $url=shift;
 101         if (exists $IkiWiki::Plugin::htmlscrubber::{safe_url_regexp} &&
 102             defined $IkiWiki::Plugin::htmlscrubber::safe_url_regexp) {
 103                 return $url=~/$IkiWiki::Plugin::htmlscrubber::safe_url_regexp/;
 104         }
 105         else {
 106                 return 1;
 107         }
 108 } #}}}
 109
 110 sub preprocess { # {{{
 111         my %params = @_;
 112         my $page = $params{page};
 113
 114         my $format = $params{format};
 115         if (defined $format && !exists $IkiWiki::hooks{htmlize}{$format}) {
 116                 error(sprintf(gettext("unsupported page format %s"), $format));
 117         }
 118
 119         my $content = $params{content};
 120         if (!defined $content) {
 121                 error(gettext("comment must have content"));
 122         }
 123         $content =~ s/\\"/"/g;
 124
 125         $content = IkiWiki::filter($page, $params{destpage}, $content);
 126
 127         if ($config{comments_allowdirectives}) {
 128                 $content = IkiWiki::preprocess($page, $params{destpage},
 129                         $content);
 130         }
 131
 132         # no need to bother with htmlize if it's just HTML
 133         $content = IkiWiki::htmlize($page, $params{destpage}, $format,
 134                 $content) if defined $format;
 135
 136         IkiWiki::run_hooks(sanitize => sub {
 137                 $content = shift->(
 138                         page => $page,
 139                         destpage => $params{destpage},
 140                         content => $content,
 141                 );
 142         });
 143
 144         # set metadata, possibly overriding [[!meta]] directives from the
 145         # comment itself
 146
 147         my $commentuser;
 148         my $commentip;
 149         my $commentauthor;
 150         my $commentauthorurl;
 151
 152         if (defined $params{username}) {
 153                 $commentuser = $params{username};
 154                 ($commentauthorurl, $commentauthor) =
 155                         linkuser($params{username});
 156         }
 157         else {
 158                 if (defined $params{ip}) {
 159                         $commentip = $params{ip};
 160                 }
 161                 $commentauthor = gettext("Anonymous");
 162         }
 163
 164         $pagestate{$page}{comments}{commentuser} = $commentuser;
 165         $pagestate{$page}{comments}{commentip} = $commentip;
 166         $pagestate{$page}{comments}{commentauthor} = $commentauthor;
 167         $pagestate{$page}{comments}{commentauthorurl} = $commentauthorurl;
 168         if (!defined $pagestate{$page}{meta}{author}) {
 169                 $pagestate{$page}{meta}{author} = $commentauthor;
 170         }
 171         if (!defined $pagestate{$page}{meta}{authorurl}) {
 172                 $pagestate{$page}{meta}{authorurl} = $commentauthorurl;
 173         }
 174
 175         if ($config{comments_allowauthor}) {
 176                 if (defined $params{claimedauthor}) {
 177                         $pagestate{$page}{meta}{author} = $params{claimedauthor};
 178                 }
 179
 180                 if (defined $params{url} and safeurl($params{url})) {
 181                         $pagestate{$page}{meta}{authorurl} = $params{url};
 182                 }
 183         }
 184         else {
 185                 $pagestate{$page}{meta}{author} = $commentauthor;
 186                 $pagestate{$page}{meta}{authorurl} = $commentauthorurl;
 187         }
 188
 189         if (defined $params{subject}) {
 190                 $pagestate{$page}{meta}{title} = $params{subject};
 191         }
 192
 193         my $baseurl = urlto($params{destpage}, undef, 1);
 194         my $anchor = "";
 195         my $comments_pagename = $config{comments_pagename};
 196         if ($params{page} =~ m/\/(\Q${comments_pagename}\E\d+)$/) {
 197                 $anchor = $1;
 198         }
 199         $pagestate{$page}{meta}{permalink} = "${baseurl}#${anchor}";
 200
 201         eval q{use Date::Parse};
 202         if (! $@) {
 203                 my $time = str2time($params{date});
 204                 $IkiWiki::pagectime{$page} = $time if defined $time;
 205         }
 206
 207         # FIXME: hard-coded HTML (although it's just to set an ID)
 208         return "<div id=\"$anchor\">$content</div>" if $anchor;
 209         return $content;
 210 } # }}}
 211
 212 sub checkconfig () { #{{{
 213         $config{comments_commit} = 1 unless defined $config{comments_commit};
 214         $config{comments_pagename} = 'comment_'
 215                 unless defined $config{comments_pagename};
 216 } #}}}
 217
 218 # This is exactly the same as recentchanges_link :-(
 219 sub linkcgi ($) { #{{{
 220         my $cgi=shift;
 221         if (defined $cgi->param('do') && $cgi->param('do') eq "commenter") {
 222
 223                 my $page=decode_utf8($cgi->param("page"));
 224                 if (!defined $page) {
 225                         error("missing page parameter");
 226                 }
 227
 228                 IkiWiki::loadindex();
 229
 230                 my $link=bestlink("", $page);
 231                 if (! length $link) {
 232                         print "Content-type: text/html\n\n";
 233                         print IkiWiki::misctemplate(gettext(gettext("missing page")),
 234                                 "<p>".
 235                                 sprintf(gettext("The page %s does not exist."),
 236                                         htmllink("", "", $page)).
 237                                 "</p>");
 238                 }
 239                 else {
 240                         IkiWiki::redirect($cgi, urlto($link, undef, 1));
 241                 }
 242
 243                 exit;
 244         }
 245 }
 246
 247 # FIXME: basically the same logic as recentchanges
 248 # returns (author URL, pretty-printed version)
 249 sub linkuser ($) { # {{{
 250         my $user = shift;
 251         my $oiduser = eval { IkiWiki::openiduser($user) };
 252
 253         if (defined $oiduser) {
 254                 return ($user, $oiduser);
 255         }
 256         # FIXME: it'd be good to avoid having such a link for anonymous
 257         # posts
 258         else {
 259                 return (IkiWiki::cgiurl(
 260                                 do => 'commenter',
 261                                 page => (length $config{userdir}
 262                                         ? "$config{userdir}/$user"
 263                                         : "$user")
 264                         ), $user);
 265         }
 266 } # }}}
 267
 268 # Mostly cargo-culted from IkiWiki::plugin::editpage
 269 sub sessioncgi ($$) { #{{{
 270         my $cgi=shift;
 271         my $session=shift;
 272
 273         my $do = $cgi->param('do');
 274         return unless $do eq 'comment';
 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 => scalar IkiWiki::template_params('comments_form.tmpl'),
 293                 # wtf does this do in editpage?
 294                 wikiname => $config{wikiname},
 295         );
 296
 297         IkiWiki::decode_form_utf8($form);
 298         IkiWiki::run_hooks(formbuilder_setup => sub {
 299                         shift->(title => "comment", form => $form, cgi => $cgi,
 300                                 session => $session, buttons => \@buttons);
 301                 });
 302         IkiWiki::decode_form_utf8($form);
 303
 304         my $type = $form->param('type');
 305         if (defined $type && length $type && $IkiWiki::hooks{htmlize}{$type}) {
 306                 $type = IkiWiki::possibly_foolish_untaint($type);
 307         }
 308         else {
 309                 $type = $config{default_pageext};
 310         }
 311         my @page_types;
 312         if (exists $IkiWiki::hooks{htmlize}) {
 313                 @page_types = grep { !/^_/ } keys %{$IkiWiki::hooks{htmlize}};
 314         }
 315
 316         my $allow_author = $config{comments_allowauthor};
 317
 318         $form->field(name => 'do', type => 'hidden');
 319         $form->field(name => 'sid', type => 'hidden', value => $session->id,
 320                 force => 1);
 321         $form->field(name => 'page', type => 'hidden');
 322         $form->field(name => 'subject', type => 'text', size => 72);
 323         $form->field(name => 'editcontent', type => 'textarea', rows => 10);
 324         $form->field(name => "type", value => $type, force => 1,
 325                 type => 'select', options => \@page_types);
 326
 327         $form->tmpl_param(username => $session->param('name'));
 328
 329         if ($allow_author and !defined $session->param('name')) {
 330                 $form->tmpl_param(allowauthor => 1);
 331                 $form->field(name => 'author', type => 'text', size => '40');
 332                 $form->field(name => 'url', type => 'text', size => '40');
 333         }
 334         else {
 335                 $form->tmpl_param(allowauthor => 0);
 336                 $form->field(name => 'author', type => 'hidden', value => '',
 337                         force => 1);
 338                 $form->field(name => 'url', type => 'hidden', value => '',
 339                         force => 1);
 340         }
 341
 342         # The untaint is OK (as in editpage) because we're about to pass
 343         # it to file_pruned anyway
 344         my $page = $form->field('page');
 345         $page = IkiWiki::possibly_foolish_untaint($page);
 346         if (!defined $page || !length $page ||
 347                 IkiWiki::file_pruned($page, $config{srcdir})) {
 348                 error(gettext("bad page name"));
 349         }
 350
 351         my $allow_directives = $config{comments_allowdirectives};
 352         my $commit_comments = $config{comments_commit};
 353         my $comments_pagename = $config{comments_pagename};
 354
 355         # FIXME: is this right? Or should we be using the candidate subpage
 356         # (whatever that might mean) as the base URL?
 357         my $baseurl = urlto($page, undef, 1);
 358
 359         $form->title(sprintf(gettext("commenting on %s"),
 360                         IkiWiki::pagetitle($page)));
 361
 362         $form->tmpl_param('helponformattinglink',
 363                 htmllink($page, $page, 'ikiwiki/formatting',
 364                         noimageinline => 1,
 365                         linktext => 'FormattingHelp'),
 366                         allowdirectives => $allow_directives);
 367
 368         if ($form->submitted eq CANCEL) {
 369                 # bounce back to the page they wanted to comment on, and exit.
 370                 # CANCEL need not be considered in future
 371                 IkiWiki::redirect($cgi, urlto($page, undef, 1));
 372                 exit;
 373         }
 374
 375         if (not exists $pagesources{$page}) {
 376                 error(sprintf(gettext(
 377                         "page '%s' doesn't exist, so you can't comment"),
 378                         $page));
 379         }
 380
 381         if (not pagespec_match($page, $config{comments_open_pagespec},
 382                 location => $page)) {
 383                 error(sprintf(gettext(
 384                         "comments on page '%s' are closed"),
 385                         $page));
 386         }
 387
 388         # Set a flag to indicate that we're posting a comment,
 389         # so that postcomment() can tell it should match.
 390         $postcomment=1;
 391         IkiWiki::check_canedit($page, $cgi, $session);
 392         $postcomment=0;
 393
 394         my $editcontent = $form->field('editcontent') || '';
 395         $editcontent =~ s/\r\n/\n/g;
 396         $editcontent =~ s/\r/\n/g;
 397
 398         # FIXME: check that the wiki is locked right now, because
 399         # if it's not, there are mad race conditions!
 400
 401         # FIXME: rather a simplistic way to make the comments...
 402         my $i = 0;
 403         my $file;
 404         my $location;
 405         do {
 406                 $i++;
 407                 $location = "$page/${comments_pagename}${i}";
 408         } while (-e "$config{srcdir}/$location._comment");
 409
 410         my $anchor = "${comments_pagename}${i}";
 411
 412         $editcontent =~ s/"/\\"/g;
 413         my $content = "[[!_comment format=$type\n";
 414
 415         # FIXME: handling of double quotes probably wrong?
 416         if (defined $session->param('name')) {
 417                 my $username = $session->param('name');
 418                 $username =~ s/"/&quot;/g;
 419                 $content .= " username=\"$username\"\n";
 420         }
 421         elsif (defined $ENV{REMOTE_ADDR}) {
 422                 my $ip = $ENV{REMOTE_ADDR};
 423                 if ($ip =~ m/^([.0-9]+)$/) {
 424                         $content .= " ip=\"$1\"\n";
 425                 }
 426         }
 427
 428         if ($allow_author) {
 429                 my $author = $form->field('author');
 430                 if (length $author) {
 431                         $author =~ s/"/&quot;/g;
 432                         $content .= " claimedauthor=\"$author\"\n";
 433                 }
 434                 my $url = $form->field('url');
 435                 if (length $url) {
 436                         $url =~ s/"/&quot;/g;
 437                         $content .= " url=\"$url\"\n";
 438                 }
 439         }
 440
 441         my $subject = $form->field('subject');
 442         if (length $subject) {
 443                 $subject =~ s/"/&quot;/g;
 444                 $content .= " subject=\"$subject\"\n";
 445         }
 446
 447         $content .= " date=\"" . decode_utf8(strftime('%Y-%m-%dT%H:%M:%SZ', gmtime)) . "\"\n";
 448
 449         $content .= " content=\"\"\"\n$editcontent\n\"\"\"]]\n";
 450
 451         # This is essentially a simplified version of editpage:
 452         # - the user does not control the page that's created, only the parent
 453         # - it's always a create operation, never an edit
 454         # - this means that conflicts should never happen
 455         # - this means that if they do, rocks fall and everyone dies
 456
 457         if ($form->submitted eq PREVIEW) {
 458                 my $preview = IkiWiki::htmlize($location, $page, '_comment',
 459                                 IkiWiki::linkify($page, $page,
 460                                         IkiWiki::preprocess($page, $page,
 461                                                 IkiWiki::filter($location,
 462                                                         $page, $content),
 463                                                 0, 1)));
 464                 IkiWiki::run_hooks(format => sub {
 465                                 $preview = shift->(page => $page,
 466                                         content => $preview);
 467                         });
 468
 469                 my $template = template("comments_display.tmpl");
 470                 $template->param(content => $preview);
 471                 $template->param(title => $form->field('subject'));
 472                 $template->param(ctime => displaytime(time));
 473
 474                 $form->tmpl_param(page_preview => $template->output);
 475         }
 476         else {
 477                 $form->tmpl_param(page_preview => "");
 478         }
 479
 480         if ($form->submitted eq POST_COMMENT && $form->validate) {
 481                 my $file = "$location._comment";
 482
 483                 IkiWiki::checksessionexpiry($session, $cgi->param('sid'));
 484
 485                 # FIXME: could probably do some sort of graceful retry
 486                 # on error? Would require significant unwinding though
 487                 writefile($file, $config{srcdir}, $content);
 488
 489                 my $conflict;
 490
 491                 if ($config{rcs} and $commit_comments) {
 492                         my $message = gettext("Added a comment");
 493                         if (defined $form->field('subject') &&
 494                                 length $form->field('subject')) {
 495                                 $message = sprintf(
 496                                         gettext("Added a comment: %s"),
 497                                         $form->field('subject'));
 498                         }
 499
 500                         IkiWiki::rcs_add($file);
 501                         IkiWiki::disable_commit_hook();
 502                         $conflict = IkiWiki::rcs_commit_staged($message,
 503                                 $session->param('name'), $ENV{REMOTE_ADDR});
 504                         IkiWiki::enable_commit_hook();
 505                         IkiWiki::rcs_update();
 506                 }
 507
 508                 # Now we need a refresh
 509                 require IkiWiki::Render;
 510                 IkiWiki::refresh();
 511                 IkiWiki::saveindex();
 512
 513                 # this should never happen, unless a committer deliberately
 514                 # breaks it or something
 515                 error($conflict) if defined $conflict;
 516
 517                 # Bounce back to where we were, but defeat broken caches
 518                 my $anticache = "?updated=$page/${comments_pagename}${i}";
 519                 IkiWiki::redirect($cgi, urlto($page, undef, 1).$anticache);
 520         }
 521         else {
 522                 IkiWiki::showform ($form, \@buttons, $session, $cgi,
 523                         forcebaseurl => $baseurl);
 524         }
 525
 526         exit;
 527 } #}}}
 528
 529 sub pagetemplate (@) { #{{{
 530         my %params = @_;
 531
 532         my $page = $params{page};
 533         my $template = $params{template};
 534
 535         if ($template->query(name => 'comments')) {
 536                 my $comments = undef;
 537
 538                 my $comments_pagename = $config{comments_pagename};
 539
 540                 my $open = 0;
 541                 my $shown = pagespec_match($page,
 542                         $config{comments_shown_pagespec},
 543                         location => $page);
 544
 545                 if (pagespec_match($page, "*/${comments_pagename}*",
 546                                 location => $page)) {
 547                         $shown = 0;
 548                         $open = 0;
 549                 }
 550
 551                 if (length $config{cgiurl}) {
 552                         $open = pagespec_match($page,
 553                                 $config{comments_open_pagespec},
 554                                 location => $page);
 555                 }
 556
 557                 if ($shown) {
 558                         $comments = IkiWiki::preprocess_inline(
 559                                 pages => "internal($page/${comments_pagename}*)",
 560                                 template => 'comments_display',
 561                                 show => 0,
 562                                 reverse => 'yes',
 563                                 page => $page,
 564                                 destpage => $params{destpage},
 565                                 feedfile => 'comments',
 566                                 emptyfeeds => 'no',
 567                         );
 568                 }
 569
 570                 if (defined $comments && length $comments) {
 571                         $template->param(comments => $comments);
 572                 }
 573
 574                 if ($open) {
 575                         my $commenturl = IkiWiki::cgiurl(do => 'comment',
 576                                 page => $page);
 577                         $template->param(commenturl => $commenturl);
 578                 }
 579         }
 580
 581         if ($template->query(name => 'commentuser')) {
 582                 $template->param(commentuser =>
 583                         $pagestate{$page}{comments}{commentuser});
 584         }
 585
 586         if ($template->query(name => 'commentip')) {
 587                 $template->param(commentip =>
 588                         $pagestate{$page}{comments}{commentip});
 589         }
 590
 591         if ($template->query(name => 'commentauthor')) {
 592                 $template->param(commentauthor =>
 593                         $pagestate{$page}{comments}{commentauthor});
 594         }
 595
 596         if ($template->query(name => 'commentauthorurl')) {
 597                 $template->param(commentauthorurl =>
 598                         $pagestate{$page}{comments}{commentauthorurl});
 599         }
 600 } # }}}
 601
 602 package IkiWiki::PageSpec;
 603
 604 sub match_postcomment ($$;@) {
 605         my $page = shift;
 606         my $glob = shift;
 607
 608         if (! $postcomment) {
 609                 return IkiWiki::FailReason->new("not posting a comment");
 610         }
 611         return match_glob($page, $glob);
 612 }
 613
 614 1