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 => "needsbuild", id => "meta", call => \&needsbuild);
  13         hook(type => "preprocess", id => "meta", call => \&preprocess, scan => 1);
  14         hook(type => "pagetemplate", id => "meta", call => \&pagetemplate);
  15 } # }}}
  16
  17 sub needsbuild (@) { #{{{
  18         my $needsbuild=shift;
  19         foreach my $page (keys %pagestate) {
  20                 if (exists $pagestate{$page}{meta}) {
  21                         if (exists $pagesources{$page} &&
  22                             grep { $_ eq $pagesources{$page} } @$needsbuild) {
  23                                 # remove state, it will be re-added
  24                                 # if the preprocessor directive is still
  25                                 # there during the rebuild
  26                                 delete $pagestate{$page}{meta};
  27                         }
  28                 }
  29         }
  30 }
  31
  32 sub scrub ($) { #{{{
  33         if (IkiWiki::Plugin::htmlscrubber->can("sanitize")) {
  34                 return IkiWiki::Plugin::htmlscrubber::sanitize(content => shift);
  35         }
  36         else {
  37                 return shift;
  38         }
  39 } #}}}
  40
  41 sub safeurl ($) { #{{{
  42         my $url=shift;
  43         if (exists $IkiWiki::Plugin::htmlscrubber::{safe_url_regexp} &&
  44             defined $IkiWiki::Plugin::htmlscrubber::safe_url_regexp) {
  45                 return $url=~/$IkiWiki::Plugin::htmlscrubber::safe_url_regexp/;
  46         }
  47         else {
  48                 return 1;
  49         }
  50 } #}}}
  51
  52 sub htmlize ($$$) { #{{{
  53         my $page = shift;
  54         my $destpage = shift;
  55
  56         return IkiWiki::htmlize($page, $destpage, pagetype($pagesources{$page}),
  57                 IkiWiki::linkify($page, $destpage,
  58                 IkiWiki::preprocess($page, $destpage, shift)));
  59 }
  60
  61 sub preprocess (@) { #{{{
  62         return "" unless @_;
  63         my %params=@_;
  64         my $key=shift;
  65         my $value=$params{$key};
  66         delete $params{$key};
  67         my $page=$params{page};
  68         delete $params{page};
  69         my $destpage=$params{destpage};
  70         delete $params{destpage};
  71         delete $params{preview};
  72
  73         eval q{use HTML::Entities};
  74         # Always decode, even if encoding later, since it might not be
  75         # fully encoded.
  76         $value=decode_entities($value);
  77
  78         # Metadata collection that needs to happen during the scan pass.
  79         if ($key eq 'title') {
  80                 $pagestate{$page}{meta}{title}=HTML::Entities::encode_numeric($value);
  81                 # fallthrough
  82         }
  83         elsif ($key eq 'description') {
  84                 $pagestate{$page}{meta}{description}=HTML::Entities::encode_numeric($value);
  85                 # fallthrough
  86         }
  87         elsif ($key eq 'guid') {
  88                 my $abs = $value;
  89
  90                 if ($abs =~ m/^[[:xdigit:]]{8}-[[:xdigit:]]{4}-[[:xdigit]]{4}-[[:xdigit:]]{4}-[[:xdigit:]]{12}$/) {
  91                         $abs = lc "urn:uuid:$abs";
  92                 }
  93
  94                 $pagestate{$page}{meta}{guid}=HTML::Entities::encode_numeric($abs);
  95                 # fallthrough
  96         }
  97         elsif ($key eq 'license') {
  98                 push @{$metaheaders{$page}}, '<link rel="license" href="#page_license" />';
  99                 $pagestate{$page}{meta}{license}=$value;
 100                 return "";
 101         }
 102         elsif ($key eq 'copyright') {
 103                 push @{$metaheaders{$page}}, '<link rel="copyright" href="#page_copyright" />';
 104                 $pagestate{$page}{meta}{copyright}=$value;
 105                 return "";
 106         }
 107         elsif ($key eq 'link' && ! %params) {
 108                 # hidden WikiLink
 109                 push @{$links{$page}}, $value;
 110                 return "";
 111         }
 112         elsif ($key eq 'author') {
 113                 $pagestate{$page}{meta}{author}=$value;
 114                 # fallthorough
 115         }
 116         elsif ($key eq 'authorurl') {
 117                 $pagestate{$page}{meta}{authorurl}=$value if safeurl($value);
 118                 # fallthrough
 119         }
 120
 121         if (! defined wantarray) {
 122                 # avoid collecting duplicate data during scan pass
 123                 return;
 124         }
 125
 126         # Metadata collection that happens only during preprocessing pass.
 127         if ($key eq 'date') {
 128                 eval q{use Date::Parse};
 129                 if (! $@) {
 130                         my $time = str2time($value);
 131                         $IkiWiki::pagectime{$page}=$time if defined $time;
 132                 }
 133         }
 134         elsif ($key eq 'permalink') {
 135                 if (safeurl($value)) {
 136                         $pagestate{$page}{meta}{permalink}=$value;
 137                         push @{$metaheaders{$page}}, scrub('<link rel="bookmark" href="'.encode_entities($value).'" />');
 138                 }
 139         }
 140         elsif ($key eq 'stylesheet') {
 141                 my $rel=exists $params{rel} ? $params{rel} : "alternate stylesheet";
 142                 my $title=exists $params{title} ? $params{title} : $value;
 143                 # adding .css to the value prevents using any old web
 144                 # editable page as a stylesheet
 145                 my $stylesheet=bestlink($page, $value.".css");
 146                 if (! length $stylesheet) {
 147                         return "[[meta ".gettext("stylesheet not found")."]]";
 148                 }
 149                 push @{$metaheaders{$page}}, '<link href="'.urlto($stylesheet, $page).
 150                         '" rel="'.encode_entities($rel).
 151                         '" title="'.encode_entities($title).
 152                         "\" type=\"text/css\" />";
 153         }
 154         elsif ($key eq 'openid') {
 155                 if (exists $params{server} && safeurl($params{server})) {
 156                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
 157                                 '" rel="openid.server" />';
 158                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
 159                                 '" rel="openid2.provider" />';
 160                 }
 161                 if (safeurl($value)) {
 162                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
 163                                 '" rel="openid.delegate" />';
 164                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
 165                                 '" rel="openid2.local_id" />';
 166                 }
 167                 if (exists $params{"xrds-location"} && safeurl($params{"xrds-location"})) {
 168                         push @{$metaheaders{$page}}, '<meta http-equiv="X-XRDS-Location"'.
 169                                 'content="'.encode_entities($params{"xrds-location"}).'" />';
 170                 }
 171         }
 172         elsif ($key eq 'redir') {
 173                 return "" if $page ne $destpage;
 174                 my $safe=0;
 175                 if ($value !~ /^\w+:\/\//) {
 176                         my ($redir_page, $redir_anchor) = split /\#/, $value;
 177
 178                         add_depends($page, $redir_page);
 179                         my $link=bestlink($page, $redir_page);
 180                         if (! length $link) {
 181                                 return "[[meta ".gettext("redir page not found")."]]";
 182                         }
 183
 184                         $value=urlto($link, $page);
 185                         $value.='#'.$redir_anchor if defined $redir_anchor;
 186                         $safe=1;
 187
 188                         # redir cycle detection
 189                         $pagestate{$page}{meta}{redir}=$link;
 190                         my $at=$page;
 191                         my %seen;
 192                         while (exists $pagestate{$at}{meta}{redir}) {
 193                                 if ($seen{$at}) {
 194                                         return "[[meta ".gettext("redir cycle is not allowed")."]]";
 195                                 }
 196                                 $seen{$at}=1;
 197                                 $at=$pagestate{$at}{meta}{redir};
 198                         }
 199                 }
 200                 else {
 201                         $value=encode_entities($value);
 202                 }
 203                 my $delay=int(exists $params{delay} ? $params{delay} : 0);
 204                 my $redir="<meta http-equiv=\"refresh\" content=\"$delay; URL=$value\" />";
 205                 if (! $safe) {
 206                         $redir=scrub($redir);
 207                 }
 208                 push @{$metaheaders{$page}}, $redir;
 209         }
 210         elsif ($key eq 'link') {
 211                 if (%params) {
 212                         push @{$metaheaders{$page}}, scrub("<link href=\"".encode_entities($value)."\" ".
 213                                 join(" ", map {
 214                                         encode_entities($_)."=\"".encode_entities(decode_entities($params{$_}))."\""
 215                                 } keys %params).
 216                                 " />\n");
 217                 }
 218         }
 219         elsif ($key eq 'robots') {
 220                 push @{$metaheaders{$page}}, '<meta name="robots"'.
 221                         ' content="'.encode_entities($value).'" />';
 222         }
 223         else {
 224                 push @{$metaheaders{$page}}, scrub('<meta name="'.encode_entities($key).
 225                         '" content="'.encode_entities($value).'" />');
 226         }
 227
 228         return "";
 229 } # }}}
 230
 231 sub pagetemplate (@) { #{{{
 232         my %params=@_;
 233         my $page=$params{page};
 234         my $destpage=$params{destpage};
 235         my $template=$params{template};
 236
 237         if (exists $metaheaders{$page} && $template->query(name => "meta")) {
 238                 # avoid duplicate meta lines
 239                 my %seen;
 240                 $template->param(meta => join("\n", grep { (! $seen{$_}) && ($seen{$_}=1) } @{$metaheaders{$page}}));
 241         }
 242         if (exists $pagestate{$page}{meta}{title} && $template->query(name => "title")) {
 243                 $template->param(title => $pagestate{$page}{meta}{title});
 244                 $template->param(title_overridden => 1);
 245         }
 246
 247         foreach my $field (qw{author authorurl permalink}) {
 248                 $template->param($field => $pagestate{$page}{meta}{$field})
 249                         if exists $pagestate{$page}{meta}{$field} && $template->query(name => $field);
 250         }
 251
 252         foreach my $field (qw{license copyright}) {
 253                 if (exists $pagestate{$page}{meta}{$field} && $template->query(name => $field) &&
 254                     ($page eq $destpage || ! exists $pagestate{$destpage}{meta}{$field} ||
 255                      $pagestate{$page}{meta}{$field} ne $pagestate{$destpage}{meta}{$field})) {
 256                         $template->param($field => htmlize($page, $destpage, $pagestate{$page}{meta}{$field}));
 257                 }
 258         }
 259 } # }}}
 260
 261 sub match { #{{{
 262         my $field=shift;
 263         my $page=shift;
 264
 265         # turn glob into a safe regexp
 266         my $re=IkiWiki::glob2re(shift);
 267
 268         my $val;
 269         if (exists $pagestate{$page}{meta}{$field}) {
 270                 $val=$pagestate{$page}{meta}{$field};
 271         }
 272         elsif ($field eq 'title') {
 273                 $val=pagetitle($page);
 274         }
 275
 276         if (defined $val) {
 277                 if ($val=~/^$re$/i) {
 278                         return IkiWiki::SuccessReason->new("$re matches $field of $page");
 279                 }
 280                 else {
 281                         return IkiWiki::FailReason->new("$re does not match $field of $page");
 282                 }
 283         }
 284         else {
 285                 return IkiWiki::FailReason->new("$page does not have a $field");
 286         }
 287 } #}}}
 288
 289 package IkiWiki::PageSpec;
 290
 291 sub match_title ($$;@) { #{{{
 292         IkiWiki::Plugin::meta::match("title", @_);
 293 } #}}}
 294
 295 sub match_author ($$;@) { #{{{
 296         IkiWiki::Plugin::meta::match("author", @_);
 297 } #}}}
 298
 299 sub match_authorurl ($$;@) { #{{{
 300         IkiWiki::Plugin::meta::match("authorurl", @_);
 301 } #}}}
 302
 303 sub match_license ($$;@) { #{{{
 304         IkiWiki::Plugin::meta::match("license", @_);
 305 } #}}}
 306
 307 sub match_copyright ($$;@) { #{{{
 308         IkiWiki::Plugin::meta::match("copyright", @_);
 309 } #}}}
 310
 311 1