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1 #!/usr/bin/perl
2 # Ikiwiki metadata plugin.
3 package IkiWiki::Plugin::meta;
5 use warnings;
6 use strict;
7 use IkiWiki 3.00;
9 my %metaheaders;
11 sub import {
12         hook(type => "getsetup", id => "meta", call => \&getsetup);
13         hook(type => "needsbuild", id => "meta", call => \&needsbuild);
14         hook(type => "preprocess", id => "meta", call => \&preprocess, scan => 1);
15         hook(type => "pagetemplate", id => "meta", call => \&pagetemplate);
16 }
18 sub getsetup () {
19         return
20                 plugin => {
21                         safe => 1,
22                         rebuild => undef,
23                         section => "core",
24                 },
25 }
27 sub needsbuild (@) {
28         my $needsbuild=shift;
29         foreach my $page (keys %pagestate) {
30                 if (exists $pagestate{$page}{meta}) {
31                         if (exists $pagesources{$page} &&
32                             grep { $_ eq $pagesources{$page} } @$needsbuild) {
33                                 # remove state, it will be re-added
34                                 # if the preprocessor directive is still
35                                 # there during the rebuild
36                                 delete $pagestate{$page}{meta};
37                         }
38                 }
39         }
40         return $needsbuild;
41 }
43 sub scrub ($$$) {
44         if (IkiWiki::Plugin::htmlscrubber->can("sanitize")) {
45                 return IkiWiki::Plugin::htmlscrubber::sanitize(
46                         content => shift, page => shift, destpage => shift);
47         }
48         else {
49                 return shift;
50         }
51 }
53 sub safeurl ($) {
54         my $url=shift;
55         if (exists $IkiWiki::Plugin::htmlscrubber::{safe_url_regexp} &&
56             defined $IkiWiki::Plugin::htmlscrubber::safe_url_regexp) {
57                 return $url=~/$IkiWiki::Plugin::htmlscrubber::safe_url_regexp/;
58         }
59         else {
60                 return 1;
61         }
62 }
64 sub htmlize ($$$) {
65         my $page = shift;
66         my $destpage = shift;
68         return IkiWiki::htmlize($page, $destpage, pagetype($pagesources{$page}),
69                 IkiWiki::linkify($page, $destpage,
70                 IkiWiki::preprocess($page, $destpage, shift)));
71 }
73 sub preprocess (@) {
74         return "" unless @_;
75         my %params=@_;
76         my $key=shift;
77         my $value=$params{$key};
78         delete $params{$key};
79         my $page=$params{page};
80         delete $params{page};
81         my $destpage=$params{destpage};
82         delete $params{destpage};
83         delete $params{preview};
85         eval q{use HTML::Entities};
86         # Always decode, even if encoding later, since it might not be
87         # fully encoded.
88         $value=decode_entities($value);
90         # Metadata collection that needs to happen during the scan pass.
91         if ($key eq 'title') {
92                 $pagestate{$page}{meta}{title}=$value;
93                 if (exists $params{sortas}) {
94                         $pagestate{$page}{meta}{titlesort}=$params{sortas};
95                 }
96                 else {
97                         delete $pagestate{$page}{meta}{titlesort};
98                 }
99                 return "";
100         }
101         elsif ($key eq 'description') {
102                 $pagestate{$page}{meta}{description}=$value;
103                 # fallthrough
104         }
105         elsif ($key eq 'guid') {
106                 $pagestate{$page}{meta}{guid}=$value;
107                 # fallthrough
108         }
109         elsif ($key eq 'license') {
110                 push @{$metaheaders{$page}}, '<link rel="license" href="#page_license" />';
111                 $pagestate{$page}{meta}{license}=$value;
112                 return "";
113         }
114         elsif ($key eq 'copyright') {
115                 push @{$metaheaders{$page}}, '<link rel="copyright" href="#page_copyright" />';
116                 $pagestate{$page}{meta}{copyright}=$value;
117                 return "";
118         }
119         elsif ($key eq 'link' && ! %params) {
120                 # hidden WikiLink
121                 add_link($page, $value);
122                 return "";
123         }
124         elsif ($key eq 'author') {
125                 $pagestate{$page}{meta}{author}=$value;
126                 if (exists $params{sortas}) {
127                         $pagestate{$page}{meta}{authorsort}=$params{sortas};
128                 }
129                 else {
130                         delete $pagestate{$page}{meta}{authorsort};
131                 }
132                 # fallthorough
133         }
134         elsif ($key eq 'authorurl') {
135                 $pagestate{$page}{meta}{authorurl}=$value if safeurl($value);
136                 # fallthrough
137         }
138         elsif ($key eq 'permalink') {
139                 $pagestate{$page}{meta}{permalink}=$value if safeurl($value);
140                 # fallthrough
141         }
142         elsif ($key eq 'date') {
143                 eval q{use Date::Parse};
144                 if (! $@) {
145                         my $time = str2time($value);
146                         $IkiWiki::pagectime{$page}=$time if defined $time;
147                 }
148         }
149         elsif ($key eq 'updated') {
150                 eval q{use Date::Parse};
151                 if (! $@) {
152                         my $time = str2time($value);
153                         $pagestate{$page}{meta}{updated}=$time if defined $time;
154                 }
155         }
157         if (! defined wantarray) {
158                 # avoid collecting duplicate data during scan pass
159                 return;
160         }
162         # Metadata handling that happens only during preprocessing pass.
163         if ($key eq 'permalink') {
164                 if (safeurl($value)) {
165                         push @{$metaheaders{$page}}, scrub('<link rel="bookmark" href="'.encode_entities($value).'" />', $page, $destpage);
166                 }
167         }
168         elsif ($key eq 'stylesheet') {
169                 my $rel=exists $params{rel} ? $params{rel} : "alternate stylesheet";
170                 my $title=exists $params{title} ? $params{title} : $value;
171                 # adding .css to the value prevents using any old web
172                 # editable page as a stylesheet
173                 my $stylesheet=bestlink($page, $value.".css");
174                 if (! length $stylesheet) {
175                         error gettext("stylesheet not found")
176                 }
177                 push @{$metaheaders{$page}}, scrub('<link href="'.urlto($stylesheet, $page).
178                         '" rel="'.encode_entities($rel).
179                         '" title="'.encode_entities($title).
180                         "\" type=\"text/css\" />", $page, $destpage);
181         }
182         elsif ($key eq 'script') {
183                 my $defer=exists $params{defer} ? ' defer="defer"' : '';
184                 my $async=exists $params{async} ? ' async="async"' : '';
185                 my $js=bestlink($page, $value.".js");
186                 if (! length $js) {
187                         error gettext("script not found");
188                 }
189                 push @{$metaheaders{$page}}, scrub('<script src="'.urlto($js, $page).
190                         '"' . $defer . $async . ' type="text/javascript"></script>',
191                         $page, $destpage);
192         }
193         elsif ($key eq 'openid') {
194                 my $delegate=0; # both by default
195                 if (exists $params{delegate}) {
196                         $delegate = 1 if lc $params{delegate} eq 'openid';
197                         $delegate = 2 if lc $params{delegate} eq 'openid2';
198                 }
199                 if (exists $params{server} && safeurl($params{server})) {
200                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
201                                 '" rel="openid.server" />' if $delegate ne 2;
202                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
203                                 '" rel="openid2.provider" />' if $delegate ne 1;
204                 }
205                 if (safeurl($value)) {
206                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
207                                 '" rel="openid.delegate" />' if $delegate ne 2;
208                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
209                                 '" rel="openid2.local_id" />' if $delegate ne 1;
210                 }
211                 if (exists $params{"xrds-location"} && safeurl($params{"xrds-location"})) {
212                         # force url absolute
213                         eval q{use URI};
214                         error($@) if $@;
215                         my $url=URI->new_abs($params{"xrds-location"}, $config{url});
216                         push @{$metaheaders{$page}}, '<meta http-equiv="X-XRDS-Location" '.
217                                 'content="'.encode_entities($url).'" />';
218                 }
219         }
220         elsif ($key eq 'foaf') {
221                 if (safeurl($value)) {
222                         push @{$metaheaders{$page}}, '<link rel="meta" '.
223                                 'type="application/rdf+xml" title="FOAF" '.
224                                 'href="'.encode_entities($value).'" />';
225                 }
226         }
227         elsif ($key eq 'redir') {
228                 return "" if $page ne $destpage;
229                 my $safe=0;
230                 if ($value !~ /^\w+:\/\//) {
231                         my ($redir_page, $redir_anchor) = split /\#/, $value;
233                         my $link=bestlink($page, $redir_page);
234                         if (! length $link) {
235                                 error gettext("redir page not found")
236                         }
237                         add_depends($page, $link, deptype("presence"));
239                         $value=urlto($link, $page);
240                         $value.='#'.$redir_anchor if defined $redir_anchor;
241                         $safe=1;
243                         # redir cycle detection
244                         $pagestate{$page}{meta}{redir}=$link;
245                         my $at=$page;
246                         my %seen;
247                         while (exists $pagestate{$at}{meta}{redir}) {
248                                 if ($seen{$at}) {
249                                         error gettext("redir cycle is not allowed")
250                                 }
251                                 $seen{$at}=1;
252                                 $at=$pagestate{$at}{meta}{redir};
253                         }
254                 }
255                 else {
256                         $value=encode_entities($value);
257                 }
258                 my $delay=int(exists $params{delay} ? $params{delay} : 0);
259                 my $redir="<meta http-equiv=\"refresh\" content=\"$delay; URL=$value\" />";
260                 if (! $safe) {
261                         $redir=scrub($redir, $page, $destpage);
262                 }
263                 push @{$metaheaders{$page}}, $redir;
264         }
265         elsif ($key eq 'link') {
266                 if (%params) {
267                         push @{$metaheaders{$page}}, scrub("<link href=\"".encode_entities($value)."\" ".
268                                 join(" ", map {
269                                         encode_entities($_)."=\"".encode_entities(decode_entities($params{$_}))."\""
270                                 } keys %params).
271                                 " />\n", $page, $destpage);
272                 }
273         }
274         elsif ($key eq 'robots') {
275                 push @{$metaheaders{$page}}, '<meta name="robots"'.
276                         ' content="'.encode_entities($value).'" />';
277         }
278         elsif ($key eq 'description' || $key eq 'author') {
279                 push @{$metaheaders{$page}}, '<meta name="'.$key.
280                         '" content="'.encode_entities($value).'" />';
281         }
282         elsif ($key eq 'name') {
283                 push @{$metaheaders{$page}}, scrub('<meta name="'.
284                         encode_entities($value).
285                         join(' ', map { "$_=\"$params{$_}\"" } keys %params).
286                         ' />', $page, $destpage);
287         }
288         elsif ($key eq 'keywords') {
289                 # Make sure the keyword string is safe: only allow alphanumeric
290                 # characters, space and comma and strip the rest.
291                 $value =~ s/[^[:alnum:], ]+//g;
292                 push @{$metaheaders{$page}}, '<meta name="keywords"'.
293                         ' content="'.encode_entities($value).'" />';
294         }
295         else {
296                 push @{$metaheaders{$page}}, scrub('<meta name="'.
297                         encode_entities($key).'" content="'.
298                         encode_entities($value).'" />', $page, $destpage);
299         }
301         return "";
304 sub pagetemplate (@) {
305         my %params=@_;
306         my $page=$params{page};
307         my $destpage=$params{destpage};
308         my $template=$params{template};
310         if (exists $metaheaders{$page} && $template->query(name => "meta")) {
311                 # avoid duplicate meta lines
312                 my %seen;
313                 $template->param(meta => join("\n", grep { (! $seen{$_}) && ($seen{$_}=1) } @{$metaheaders{$page}}));
314         }
315         if (exists $pagestate{$page}{meta}{title} && $template->query(name => "title")) {
316                 eval q{use HTML::Entities};
317                 $template->param(title => HTML::Entities::encode_numeric($pagestate{$page}{meta}{title}));
318                 $template->param(title_overridden => 1);
319         }
321         foreach my $field (qw{authorurl}) {
322                 eval q{use HTML::Entities};
323                 $template->param($field => HTML::Entities::encode_entities($pagestate{$page}{meta}{$field}))
324                         if exists $pagestate{$page}{meta}{$field} && $template->query(name => $field);
325         }
327         foreach my $field (qw{permalink}) {
328                 if (exists $pagestate{$page}{meta}{$field} && $template->query(name => $field)) {
329                         eval q{use HTML::Entities};
330                         $template->param($field => HTML::Entities::encode_entities(IkiWiki::urlabs($pagestate{$page}{meta}{$field}, $config{url})));
331                 }
332         }
334         foreach my $field (qw{description author}) {
335                 eval q{use HTML::Entities};
336                 $template->param($field => HTML::Entities::encode_numeric($pagestate{$page}{meta}{$field}))
337                         if exists $pagestate{$page}{meta}{$field} && $template->query(name => $field);
338         }
340         foreach my $field (qw{license copyright}) {
341                 if (exists $pagestate{$page}{meta}{$field} && $template->query(name => $field) &&
342                     ($page eq $destpage || ! exists $pagestate{$destpage}{meta}{$field} ||
343                      $pagestate{$page}{meta}{$field} ne $pagestate{$destpage}{meta}{$field})) {
344                         $template->param($field => htmlize($page, $destpage, $pagestate{$page}{meta}{$field}));
345                 }
346         }
349 sub get_sort_key {
350         my $page = shift;
351         my $meta = shift;
353         # e.g. titlesort (also makes sense for author)
354         my $key = $pagestate{$page}{meta}{$meta . "sort"};
355         return $key if defined $key;
357         # e.g. title
358         $key = $pagestate{$page}{meta}{$meta};
359         return $key if defined $key;
361         # fall back to closer-to-core things
362         if ($meta eq 'title') {
363                 return pagetitle(IkiWiki::basename($page));
364         }
365         elsif ($meta eq 'date') {
366                 return $IkiWiki::pagectime{$page};
367         }
368         elsif ($meta eq 'updated') {
369                 return $IkiWiki::pagemtime{$page};
370         }
371         else {
372                 return '';
373         }
376 sub match {
377         my $field=shift;
378         my $page=shift;
379         
380         # turn glob into a safe regexp
381         my $re=IkiWiki::glob2re(shift);
383         my $val;
384         if (exists $pagestate{$page}{meta}{$field}) {
385                 $val=$pagestate{$page}{meta}{$field};
386         }
387         elsif ($field eq 'title') {
388                 $val = pagetitle($page);
389         }
391         if (defined $val) {
392                 if ($val=~$re) {
393                         return IkiWiki::SuccessReason->new("$re matches $field of $page", $page => $IkiWiki::DEPEND_CONTENT, "" => 1);
394                 }
395                 else {
396                         return IkiWiki::FailReason->new("$re does not match $field of $page", $page => $IkiWiki::DEPEND_CONTENT, "" => 1);
397                 }
398         }
399         else {
400                 return IkiWiki::FailReason->new("$page does not have a $field", $page => $IkiWiki::DEPEND_CONTENT);
401         }
404 package IkiWiki::PageSpec;
406 sub match_title ($$;@) {
407         IkiWiki::Plugin::meta::match("title", @_);
410 sub match_author ($$;@) {
411         IkiWiki::Plugin::meta::match("author", @_);
414 sub match_authorurl ($$;@) {
415         IkiWiki::Plugin::meta::match("authorurl", @_);
418 sub match_license ($$;@) {
419         IkiWiki::Plugin::meta::match("license", @_);
422 sub match_copyright ($$;@) {
423         IkiWiki::Plugin::meta::match("copyright", @_);
426 sub match_guid ($$;@) {
427         IkiWiki::Plugin::meta::match("guid", @_);
430 package IkiWiki::SortSpec;
432 sub cmp_meta {
433         my $meta = shift;
434         error(gettext("sort=meta requires a parameter")) unless defined $meta;
436         if ($meta eq 'updated' || $meta eq 'date') {
437                 return IkiWiki::Plugin::meta::get_sort_key($a, $meta)
438                         <=>
439                         IkiWiki::Plugin::meta::get_sort_key($b, $meta);
440         }
442         return IkiWiki::Plugin::meta::get_sort_key($a, $meta)
443                 cmp
444                 IkiWiki::Plugin::meta::get_sort_key($b, $meta);
447 # A prototype of how sort=title could behave in 4.0 or something
448 sub cmp_meta_title {
449         $_[0] = 'title';
450         return cmp_meta(@_);