IkiWiki/Plugin/meta.pm

   1 #!/usr/bin/perl
   2 # Ikiwiki metadata plugin.
   3 package IkiWiki::Plugin::meta;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki 2.00;
   8
   9 my %metaheaders;
  10
  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 } # }}}
  17
  18 sub getsetup () { #{{{
  19         return
  20                 plugin => {
  21                         safe => 1,
  22                         rebuild => undef,
  23                 },
  24 } #}}}
  25
  26 sub needsbuild (@) { #{{{
  27         my $needsbuild=shift;
  28         foreach my $page (keys %pagestate) {
  29                 if (exists $pagestate{$page}{meta}) {
  30                         if (exists $pagesources{$page} &&
  31                             grep { $_ eq $pagesources{$page} } @$needsbuild) {
  32                                 # remove state, it will be re-added
  33                                 # if the preprocessor directive is still
  34                                 # there during the rebuild
  35                                 delete $pagestate{$page}{meta};
  36                         }
  37                 }
  38         }
  39 }
  40
  41 sub scrub ($) { #{{{
  42         if (IkiWiki::Plugin::htmlscrubber->can("sanitize")) {
  43                 return IkiWiki::Plugin::htmlscrubber::sanitize(content => shift);
  44         }
  45         else {
  46                 return shift;
  47         }
  48 } #}}}
  49
  50 sub safeurl ($) { #{{{
  51         my $url=shift;
  52         if (exists $IkiWiki::Plugin::htmlscrubber::{safe_url_regexp} &&
  53             defined $IkiWiki::Plugin::htmlscrubber::safe_url_regexp) {
  54                 return $url=~/$IkiWiki::Plugin::htmlscrubber::safe_url_regexp/;
  55         }
  56         else {
  57                 return 1;
  58         }
  59 } #}}}
  60
  61 sub htmlize ($$$) { #{{{
  62         my $page = shift;
  63         my $destpage = shift;
  64
  65         return IkiWiki::htmlize($page, $destpage, pagetype($pagesources{$page}),
  66                 IkiWiki::linkify($page, $destpage,
  67                 IkiWiki::preprocess($page, $destpage, shift)));
  68 }
  69
  70 sub preprocess (@) { #{{{
  71         return "" unless @_;
  72         my %params=@_;
  73         my $key=shift;
  74         my $value=$params{$key};
  75         delete $params{$key};
  76         my $page=$params{page};
  77         delete $params{page};
  78         my $destpage=$params{destpage};
  79         delete $params{destpage};
  80         delete $params{preview};
  81
  82         eval q{use HTML::Entities};
  83         # Always decode, even if encoding later, since it might not be
  84         # fully encoded.
  85         $value=decode_entities($value);
  86
  87         # Metadata collection that needs to happen during the scan pass.
  88         if ($key eq 'title') {
  89                 $pagestate{$page}{meta}{title}=HTML::Entities::encode_numeric($value);
  90                 # fallthrough
  91         }
  92         elsif ($key eq 'description') {
  93                 $pagestate{$page}{meta}{description}=HTML::Entities::encode_numeric($value);
  94                 # fallthrough
  95         }
  96         elsif ($key eq 'guid') {
  97                 $pagestate{$page}{meta}{guid}=HTML::Entities::encode_numeric($value);
  98                 # fallthrough
  99         }
 100         elsif ($key eq 'license') {
 101                 push @{$metaheaders{$page}}, '<link rel="license" href="#page_license" />';
 102                 $pagestate{$page}{meta}{license}=$value;
 103                 return "";
 104         }
 105         elsif ($key eq 'copyright') {
 106                 push @{$metaheaders{$page}}, '<link rel="copyright" href="#page_copyright" />';
 107                 $pagestate{$page}{meta}{copyright}=$value;
 108                 return "";
 109         }
 110         elsif ($key eq 'link' && ! %params) {
 111                 # hidden WikiLink
 112                 push @{$links{$page}}, $value;
 113                 return "";
 114         }
 115         elsif ($key eq 'author') {
 116                 $pagestate{$page}{meta}{author}=$value;
 117                 # fallthorough
 118         }
 119         elsif ($key eq 'authorurl') {
 120                 $pagestate{$page}{meta}{authorurl}=$value if safeurl($value);
 121                 # fallthrough
 122         }
 123
 124         if (! defined wantarray) {
 125                 # avoid collecting duplicate data during scan pass
 126                 return;
 127         }
 128
 129         # Metadata collection that happens only during preprocessing pass.
 130         if ($key eq 'date') {
 131                 eval q{use Date::Parse};
 132                 if (! $@) {
 133                         my $time = str2time($value);
 134                         $IkiWiki::pagectime{$page}=$time if defined $time;
 135                 }
 136         }
 137         elsif ($key eq 'permalink') {
 138                 if (safeurl($value)) {
 139                         $pagestate{$page}{meta}{permalink}=$value;
 140                         push @{$metaheaders{$page}}, scrub('<link rel="bookmark" href="'.encode_entities($value).'" />');
 141                 }
 142         }
 143         elsif ($key eq 'stylesheet') {
 144                 my $rel=exists $params{rel} ? $params{rel} : "alternate stylesheet";
 145                 my $title=exists $params{title} ? $params{title} : $value;
 146                 # adding .css to the value prevents using any old web
 147                 # editable page as a stylesheet
 148                 my $stylesheet=bestlink($page, $value.".css");
 149                 if (! length $stylesheet) {
 150                         error gettext("stylesheet not found")
 151                 }
 152                 push @{$metaheaders{$page}}, '<link href="'.urlto($stylesheet, $page).
 153                         '" rel="'.encode_entities($rel).
 154                         '" title="'.encode_entities($title).
 155                         "\" type=\"text/css\" />";
 156         }
 157         elsif ($key eq 'openid') {
 158                 if (exists $params{server} && safeurl($params{server})) {
 159                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
 160                                 '" rel="openid.server" />';
 161                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
 162                                 '" rel="openid2.provider" />';
 163                 }
 164                 if (safeurl($value)) {
 165                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
 166                                 '" rel="openid.delegate" />';
 167                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
 168                                 '" rel="openid2.local_id" />';
 169                 }
 170                 if (exists $params{"xrds-location"} && safeurl($params{"xrds-location"})) {
 171                         push @{$metaheaders{$page}}, '<meta http-equiv="X-XRDS-Location"'.
 172                                 'content="'.encode_entities($params{"xrds-location"}).'" />';
 173                 }
 174         }
 175         elsif ($key eq 'redir') {
 176                 return "" if $page ne $destpage;
 177                 my $safe=0;
 178                 if ($value !~ /^\w+:\/\//) {
 179                         my ($redir_page, $redir_anchor) = split /\#/, $value;
 180
 181                         add_depends($page, $redir_page);
 182                         my $link=bestlink($page, $redir_page);
 183                         if (! length $link) {
 184                                 error gettext("redir page not found")
 185                         }
 186
 187                         $value=urlto($link, $page);
 188                         $value.='#'.$redir_anchor if defined $redir_anchor;
 189                         $safe=1;
 190
 191                         # redir cycle detection
 192                         $pagestate{$page}{meta}{redir}=$link;
 193                         my $at=$page;
 194                         my %seen;
 195                         while (exists $pagestate{$at}{meta}{redir}) {
 196                                 if ($seen{$at}) {
 197                                         error gettext("redir cycle is not allowed")
 198                                 }
 199                                 $seen{$at}=1;
 200                                 $at=$pagestate{$at}{meta}{redir};
 201                         }
 202                 }
 203                 else {
 204                         $value=encode_entities($value);
 205                 }
 206                 my $delay=int(exists $params{delay} ? $params{delay} : 0);
 207                 my $redir="<meta http-equiv=\"refresh\" content=\"$delay; URL=$value\" />";
 208                 if (! $safe) {
 209                         $redir=scrub($redir);
 210                 }
 211                 push @{$metaheaders{$page}}, $redir;
 212         }
 213         elsif ($key eq 'link') {
 214                 if (%params) {
 215                         push @{$metaheaders{$page}}, scrub("<link href=\"".encode_entities($value)."\" ".
 216                                 join(" ", map {
 217                                         encode_entities($_)."=\"".encode_entities(decode_entities($params{$_}))."\""
 218                                 } keys %params).
 219                                 " />\n");
 220                 }
 221         }
 222         elsif ($key eq 'robots') {
 223                 push @{$metaheaders{$page}}, '<meta name="robots"'.
 224                         ' content="'.encode_entities($value).'" />';
 225         }
 226         else {
 227                 push @{$metaheaders{$page}}, scrub('<meta name="'.encode_entities($key).
 228                         '" content="'.encode_entities($value).'" />');
 229         }
 230
 231         return "";
 232 } # }}}
 233
 234 sub pagetemplate (@) { #{{{
 235         my %params=@_;
 236         my $page=$params{page};
 237         my $destpage=$params{destpage};
 238         my $template=$params{template};
 239
 240         if (exists $metaheaders{$page} && $template->query(name => "meta")) {
 241                 # avoid duplicate meta lines
 242                 my %seen;
 243                 $template->param(meta => join("\n", grep { (! $seen{$_}) && ($seen{$_}=1) } @{$metaheaders{$page}}));
 244         }
 245         if (exists $pagestate{$page}{meta}{title} && $template->query(name => "title")) {
 246                 $template->param(title => $pagestate{$page}{meta}{title});
 247                 $template->param(title_overridden => 1);
 248         }
 249
 250         foreach my $field (qw{author authorurl permalink}) {
 251                 $template->param($field => $pagestate{$page}{meta}{$field})
 252                         if exists $pagestate{$page}{meta}{$field} && $template->query(name => $field);
 253         }
 254
 255         foreach my $field (qw{license copyright}) {
 256                 if (exists $pagestate{$page}{meta}{$field} && $template->query(name => $field) &&
 257                     ($page eq $destpage || ! exists $pagestate{$destpage}{meta}{$field} ||
 258                      $pagestate{$page}{meta}{$field} ne $pagestate{$destpage}{meta}{$field})) {
 259                         $template->param($field => htmlize($page, $destpage, $pagestate{$page}{meta}{$field}));
 260                 }
 261         }
 262 } # }}}
 263
 264 sub match { #{{{
 265         my $field=shift;
 266         my $page=shift;
 267
 268         # turn glob into a safe regexp
 269         my $re=IkiWiki::glob2re(shift);
 270
 271         my $val;
 272         if (exists $pagestate{$page}{meta}{$field}) {
 273                 $val=$pagestate{$page}{meta}{$field};
 274         }
 275         elsif ($field eq 'title') {
 276                 $val = IkiWiki::pagetitle($page);
 277         }
 278
 279         if (defined $val) {
 280                 if ($val=~/^$re$/i) {
 281                         return IkiWiki::SuccessReason->new("$re matches $field of $page");
 282                 }
 283                 else {
 284                         return IkiWiki::FailReason->new("$re does not match $field of $page");
 285                 }
 286         }
 287         else {
 288                 return IkiWiki::FailReason->new("$page does not have a $field");
 289         }
 290 } #}}}
 291
 292 package IkiWiki::PageSpec;
 293
 294 sub match_title ($$;@) { #{{{
 295         IkiWiki::Plugin::meta::match("title", @_);
 296 } #}}}
 297
 298 sub match_author ($$;@) { #{{{
 299         IkiWiki::Plugin::meta::match("author", @_);
 300 } #}}}
 301
 302 sub match_authorurl ($$;@) { #{{{
 303         IkiWiki::Plugin::meta::match("authorurl", @_);
 304 } #}}}
 305
 306 sub match_license ($$;@) { #{{{
 307         IkiWiki::Plugin::meta::match("license", @_);
 308 } #}}}
 309
 310 sub match_copyright ($$;@) { #{{{
 311         IkiWiki::Plugin::meta::match("copyright", @_);
 312 } #}}}
 313
 314 1