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 3.00;
   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                         section => "core",
  24                 },
  25 }
  26
  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 }
  41
  42 sub scrub ($$) {
  43         if (IkiWiki::Plugin::htmlscrubber->can("sanitize")) {
  44                 return IkiWiki::Plugin::htmlscrubber::sanitize(
  45                         content => shift, destpage => shift);
  46         }
  47         else {
  48                 return shift;
  49         }
  50 }
  51
  52 sub safeurl ($) {
  53         my $url=shift;
  54         if (exists $IkiWiki::Plugin::htmlscrubber::{safe_url_regexp} &&
  55             defined $IkiWiki::Plugin::htmlscrubber::safe_url_regexp) {
  56                 return $url=~/$IkiWiki::Plugin::htmlscrubber::safe_url_regexp/;
  57         }
  58         else {
  59                 return 1;
  60         }
  61 }
  62
  63 sub htmlize ($$$) {
  64         my $page = shift;
  65         my $destpage = shift;
  66
  67         return IkiWiki::htmlize($page, $destpage, pagetype($pagesources{$page}),
  68                 IkiWiki::linkify($page, $destpage,
  69                 IkiWiki::preprocess($page, $destpage, shift)));
  70 }
  71
  72 sub preprocess (@) {
  73         return "" unless @_;
  74         my %params=@_;
  75         my $key=shift;
  76         my $value=$params{$key};
  77         delete $params{$key};
  78         my $page=$params{page};
  79         delete $params{page};
  80         my $destpage=$params{destpage};
  81         delete $params{destpage};
  82         delete $params{preview};
  83
  84         eval q{use HTML::Entities};
  85         # Always decode, even if encoding later, since it might not be
  86         # fully encoded.
  87         $value=decode_entities($value);
  88
  89         # Metadata collection that needs to happen during the scan pass.
  90         if ($key eq 'title') {
  91                 $pagestate{$page}{meta}{title}=HTML::Entities::encode_numeric($value);
  92                 return "";
  93         }
  94         elsif ($key eq 'description') {
  95                 $pagestate{$page}{meta}{description}=HTML::Entities::encode_numeric($value);
  96                 # fallthrough
  97         }
  98         elsif ($key eq 'guid') {
  99                 $pagestate{$page}{meta}{guid}=HTML::Entities::encode_numeric($value);
 100                 # fallthrough
 101         }
 102         elsif ($key eq 'license') {
 103                 push @{$metaheaders{$page}}, '<link rel="license" href="#page_license" />';
 104                 $pagestate{$page}{meta}{license}=$value;
 105                 return "";
 106         }
 107         elsif ($key eq 'copyright') {
 108                 push @{$metaheaders{$page}}, '<link rel="copyright" href="#page_copyright" />';
 109                 $pagestate{$page}{meta}{copyright}=$value;
 110                 return "";
 111         }
 112         elsif ($key eq 'link' && ! %params) {
 113                 # hidden WikiLink
 114                 add_link($page, $value);
 115                 return "";
 116         }
 117         elsif ($key eq 'author') {
 118                 $pagestate{$page}{meta}{author}=$value;
 119                 # fallthorough
 120         }
 121         elsif ($key eq 'authorurl') {
 122                 $pagestate{$page}{meta}{authorurl}=$value if safeurl($value);
 123                 # fallthrough
 124         }
 125         elsif ($key eq 'permalink') {
 126                 $pagestate{$page}{meta}{permalink}=$value if safeurl($value);
 127                 # fallthrough
 128         }
 129         elsif ($key eq 'date') {
 130                 eval q{use Date::Parse};
 131                 if (! $@) {
 132                         my $time = str2time($value);
 133                         $IkiWiki::pagectime{$page}=$time if defined $time;
 134                 }
 135         }
 136         elsif ($key eq 'updated') {
 137                 eval q{use Date::Parse};
 138                 if (! $@) {
 139                         my $time = str2time($value);
 140                         $pagestate{$page}{meta}{updated}=$time if defined $time;
 141                 }
 142         }
 143
 144         if (! defined wantarray) {
 145                 # avoid collecting duplicate data during scan pass
 146                 return;
 147         }
 148
 149         # Metadata handling that happens only during preprocessing pass.
 150         if ($key eq 'permalink') {
 151                 if (safeurl($value)) {
 152                         push @{$metaheaders{$page}}, scrub('<link rel="bookmark" href="'.encode_entities($value).'" />', $destpage);
 153                 }
 154         }
 155         elsif ($key eq 'stylesheet') {
 156                 my $rel=exists $params{rel} ? $params{rel} : "alternate stylesheet";
 157                 my $title=exists $params{title} ? $params{title} : $value;
 158                 # adding .css to the value prevents using any old web
 159                 # editable page as a stylesheet
 160                 my $stylesheet=bestlink($page, $value.".css");
 161                 if (! length $stylesheet) {
 162                         error gettext("stylesheet not found")
 163                 }
 164                 push @{$metaheaders{$page}}, '<link href="'.urlto($stylesheet, $page).
 165                         '" rel="'.encode_entities($rel).
 166                         '" title="'.encode_entities($title).
 167                         "\" type=\"text/css\" />";
 168         }
 169         elsif ($key eq 'openid') {
 170                 my $delegate=0; # both by default
 171                 if (exists $params{delegate}) {
 172                         $delegate = 1 if lc $params{delegate} eq 'openid';
 173                         $delegate = 2 if lc $params{delegate} eq 'openid2';
 174                 }
 175                 if (exists $params{server} && safeurl($params{server})) {
 176                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
 177                                 '" rel="openid.server" />' if $delegate ne 2;
 178                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
 179                                 '" rel="openid2.provider" />' if $delegate ne 1;
 180                 }
 181                 if (safeurl($value)) {
 182                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
 183                                 '" rel="openid.delegate" />' if $delegate ne 2;
 184                         push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
 185                                 '" rel="openid2.local_id" />' if $delegate ne 1;
 186                 }
 187                 if (exists $params{"xrds-location"} && safeurl($params{"xrds-location"})) {
 188                         push @{$metaheaders{$page}}, '<meta http-equiv="X-XRDS-Location"'.
 189                                 'content="'.encode_entities($params{"xrds-location"}).'" />';
 190                 }
 191         }
 192         elsif ($key eq 'redir') {
 193                 return "" if $page ne $destpage;
 194                 my $safe=0;
 195                 if ($value !~ /^\w+:\/\//) {
 196                         my ($redir_page, $redir_anchor) = split /\#/, $value;
 197
 198                         my $link=bestlink($page, $redir_page);
 199                         if (! length $link) {
 200                                 error gettext("redir page not found")
 201                         }
 202                         add_depends($page, $link, deptype("presence"));
 203
 204                         $value=urlto($link, $page);
 205                         $value.='#'.$redir_anchor if defined $redir_anchor;
 206                         $safe=1;
 207
 208                         # redir cycle detection
 209                         $pagestate{$page}{meta}{redir}=$link;
 210                         my $at=$page;
 211                         my %seen;
 212                         while (exists $pagestate{$at}{meta}{redir}) {
 213                                 if ($seen{$at}) {
 214                                         error gettext("redir cycle is not allowed")
 215                                 }
 216                                 $seen{$at}=1;
 217                                 $at=$pagestate{$at}{meta}{redir};
 218                         }
 219                 }
 220                 else {
 221                         $value=encode_entities($value);
 222                 }
 223                 my $delay=int(exists $params{delay} ? $params{delay} : 0);
 224                 my $redir="<meta http-equiv=\"refresh\" content=\"$delay; URL=$value\" />";
 225                 if (! $safe) {
 226                         $redir=scrub($redir, $destpage);
 227                 }
 228                 push @{$metaheaders{$page}}, $redir;
 229         }
 230         elsif ($key eq 'link') {
 231                 if (%params) {
 232                         push @{$metaheaders{$page}}, scrub("<link href=\"".encode_entities($value)."\" ".
 233                                 join(" ", map {
 234                                         encode_entities($_)."=\"".encode_entities(decode_entities($params{$_}))."\""
 235                                 } keys %params).
 236                                 " />\n", $destpage);
 237                 }
 238         }
 239         elsif ($key eq 'robots') {
 240                 push @{$metaheaders{$page}}, '<meta name="robots"'.
 241                         ' content="'.encode_entities($value).'" />';
 242         }
 243         elsif ($key eq 'description') {
 244                 push @{$metaheaders{$page}}, '<meta name="'.encode_entities($key).
 245                         '" content="'.encode_entities($value).'" />';
 246         }
 247         else {
 248                 push @{$metaheaders{$page}}, scrub('<meta name="'.encode_entities($key).
 249                         '" content="'.encode_entities($value).'" />', $destpage);
 250         }
 251
 252         return "";
 253 }
 254
 255 sub pagetemplate (@) {
 256         my %params=@_;
 257         my $page=$params{page};
 258         my $destpage=$params{destpage};
 259         my $template=$params{template};
 260
 261         if (exists $metaheaders{$page} && $template->query(name => "meta")) {
 262                 # avoid duplicate meta lines
 263                 my %seen;
 264                 $template->param(meta => join("\n", grep { (! $seen{$_}) && ($seen{$_}=1) } @{$metaheaders{$page}}));
 265         }
 266         if (exists $pagestate{$page}{meta}{title} && $template->query(name => "title")) {
 267                 $template->param(title => $pagestate{$page}{meta}{title});
 268                 $template->param(title_overridden => 1);
 269         }
 270
 271         foreach my $field (qw{author authorurl description permalink}) {
 272                 $template->param($field => $pagestate{$page}{meta}{$field})
 273                         if exists $pagestate{$page}{meta}{$field} && $template->query(name => $field);
 274         }
 275
 276         foreach my $field (qw{license copyright}) {
 277                 if (exists $pagestate{$page}{meta}{$field} && $template->query(name => $field) &&
 278                     ($page eq $destpage || ! exists $pagestate{$destpage}{meta}{$field} ||
 279                      $pagestate{$page}{meta}{$field} ne $pagestate{$destpage}{meta}{$field})) {
 280                         $template->param($field => htmlize($page, $destpage, $pagestate{$page}{meta}{$field}));
 281                 }
 282         }
 283 }
 284
 285 sub match {
 286         my $field=shift;
 287         my $page=shift;
 288
 289         # turn glob into a safe regexp
 290         my $re=IkiWiki::glob2re(shift);
 291
 292         my $val;
 293         if (exists $pagestate{$page}{meta}{$field}) {
 294                 $val=$pagestate{$page}{meta}{$field};
 295         }
 296         elsif ($field eq 'title') {
 297                 $val = pagetitle($page);
 298         }
 299
 300         if (defined $val) {
 301                 if ($val=~/^$re$/i) {
 302                         return IkiWiki::SuccessReason->new("$re matches $field of $page", $page => $IkiWiki::DEPEND_CONTENT, "" => 1);
 303                 }
 304                 else {
 305                         return IkiWiki::FailReason->new("$re does not match $field of $page", "" => 1);
 306                 }
 307         }
 308         else {
 309                 return IkiWiki::FailReason->new("$page does not have a $field", "" => 1);
 310         }
 311 }
 312
 313 package IkiWiki::PageSpec;
 314
 315 sub match_title ($$;@) {
 316         IkiWiki::Plugin::meta::match("title", @_);
 317 }
 318
 319 sub match_author ($$;@) {
 320         IkiWiki::Plugin::meta::match("author", @_);
 321 }
 322
 323 sub match_authorurl ($$;@) {
 324         IkiWiki::Plugin::meta::match("authorurl", @_);
 325 }
 326
 327 sub match_license ($$;@) {
 328         IkiWiki::Plugin::meta::match("license", @_);
 329 }
 330
 331 sub match_copyright ($$;@) {
 332         IkiWiki::Plugin::meta::match("copyright", @_);
 333 }
 334
 335 1