+ # Metadata collection that needs to happen during the scan pass.
+ if ($key eq 'title') {
+ $pagestate{$page}{meta}{title}=HTML::Entities::encode_numeric($value);
+ }
+ elsif ($key eq 'license') {
+ push @{$metaheaders{$page}}, '<link rel="license" href="#page_license" />';
+ $pagestate{$page}{meta}{license}=$value;
+ return "";
+ }
+ elsif ($key eq 'copyright') {
+ push @{$metaheaders{$page}}, '<link rel="copyright" href="#page_copyright" />';
+ $pagestate{$page}{meta}{copyright}=$value;
+ return "";
+ }
+ elsif ($key eq 'link' && ! %params) {
+ # hidden WikiLink
+ push @{$links{$page}}, $value;
+ return "";
+ }
+ elsif ($key eq 'author') {
+ $pagestate{$page}{meta}{author}=$value;
+ # fallthorough
+ }
+ elsif ($key eq 'authorurl') {
+ $pagestate{$page}{meta}{authorurl}=$value if safeurl($value);
+ # fallthrough
+ }
+
+ if (! defined wantarray) {
+ # avoid collecting duplicate data during scan pass
+ return;
+ }
+
+ # Metadata collection that happens only during preprocessing pass.
+ if ($key eq 'date') {
+ eval q{use Date::Parse};
+ if (! $@) {
+ my $time = str2time($value);
+ $IkiWiki::pagectime{$page}=$time if defined $time;
+ }
+ }
+ elsif ($key eq 'permalink') {
+ if (safeurl($value)) {
+ $pagestate{$page}{meta}{permalink}=$value;
+ push @{$metaheaders{$page}}, scrub('<link rel="bookmark" href="'.encode_entities($value).'" />');
+ }
+ }
+ elsif ($key eq 'stylesheet') {
+ my $rel=exists $params{rel} ? $params{rel} : "alternate stylesheet";
+ my $title=exists $params{title} ? $params{title} : $value;
+ # adding .css to the value prevents using any old web
+ # editable page as a stylesheet
+ my $stylesheet=bestlink($page, $value.".css");
+ if (! length $stylesheet) {
+ return "[[meta ".gettext("stylesheet not found")."]]";
+ }
+ push @{$metaheaders{$page}}, '<link href="'.urlto($stylesheet, $page).
+ '" rel="'.encode_entities($rel).
+ '" title="'.encode_entities($title).
+ "\" type=\"text/css\" />";
+ }
+ elsif ($key eq 'openid') {
+ if (exists $params{server} && safeurl($params{server})) {
+ push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
+ '" rel="openid.server" />';
+ push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
+ '" rel="openid2.provider" />';
+ }
+ if (safeurl($value)) {
+ push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
+ '" rel="openid.delegate" />';
+ push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
+ '" rel="openid2.local_id" />';
+ }
+ if (exists $params{"xrds-location"} && safeurl($params{"xrds-location"})) {
+ push @{$metaheaders{$page}}, '<meta http-equiv="X-XRDS-Location"'.
+ 'content="'.encode_entities($params{"xrds-location"}).'" />';
+ }
+ }
+ elsif ($key eq 'redir') {
+ return "" if $page ne $destpage;
+ my $safe=0;
+ if ($value !~ /^\w+:\/\//) {
+ my ($redir_page, $redir_anchor) = split /\#/, $value;
+
+ add_depends($page, $redir_page);
+ my $link=bestlink($page, $redir_page);
+ if (! length $link) {
+ return "[[meta ".gettext("redir page not found")."]]";
+ }
+
+ $value=urlto($link, $page);
+ $value.='#'.$redir_anchor if defined $redir_anchor;
+ $safe=1;
+
+ # redir cycle detection
+ $pagestate{$page}{meta}{redir}=$link;
+ my $at=$page;
+ my %seen;
+ while (exists $pagestate{$at}{meta}{redir}) {
+ if ($seen{$at}) {
+ return "[[meta ".gettext("redir cycle is not allowed")."]]";
+ }
+ $seen{$at}=1;
+ $at=$pagestate{$at}{meta}{redir};
+ }