ikiwiki/IkiWiki/Plugin/meta.pm

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Perl
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#!/usr/bin/perl
# Ikiwiki metadata plugin.
package IkiWiki::Plugin::meta;
use warnings;
use strict;
use IkiWiki 3.00;
my %metaheaders;
sub import {
hook(type => "getsetup", id => "meta", call => \&getsetup);
hook(type => "needsbuild", id => "meta", call => \&needsbuild);
hook(type => "preprocess", id => "meta", call => \&preprocess, scan => 1);
hook(type => "pagetemplate", id => "meta", call => \&pagetemplate);
}
sub getsetup () {
return
plugin => {
safe => 1,
rebuild => undef,
section => "core",
},
}
sub needsbuild (@) {
my $needsbuild=shift;
foreach my $page (keys %pagestate) {
if (exists $pagestate{$page}{meta}) {
if (exists $pagesources{$page} &&
grep { $_ eq $pagesources{$page} } @$needsbuild) {
# remove state, it will be re-added
# if the preprocessor directive is still
# there during the rebuild
delete $pagestate{$page}{meta};
}
}
}
return $needsbuild;
}
sub scrub ($$$) {
if (IkiWiki::Plugin::htmlscrubber->can("sanitize")) {
return IkiWiki::Plugin::htmlscrubber::sanitize(
content => shift, page => shift, destpage => shift);
}
else {
return shift;
}
}
sub safeurl ($) {
my $url=shift;
if (exists $IkiWiki::Plugin::htmlscrubber::{safe_url_regexp} &&
defined $IkiWiki::Plugin::htmlscrubber::safe_url_regexp) {
return $url=~/$IkiWiki::Plugin::htmlscrubber::safe_url_regexp/;
}
else {
return 1;
}
}
sub htmlize ($$$) {
my $page = shift;
my $destpage = shift;
return IkiWiki::htmlize($page, $destpage, pagetype($pagesources{$page}),
IkiWiki::linkify($page, $destpage,
IkiWiki::preprocess($page, $destpage, shift)));
}
sub preprocess (@) {
return "" unless @_;
my %params=@_;
my $key=shift;
my $value=$params{$key};
delete $params{$key};
my $page=$params{page};
delete $params{page};
my $destpage=$params{destpage};
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delete $params{destpage};
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delete $params{preview};
eval q{use HTML::Entities};
# Always decode, even if encoding later, since it might not be
# fully encoded.
$value=decode_entities($value);
# Metadata collection that needs to happen during the scan pass.
if ($key eq 'title') {
$pagestate{$page}{meta}{title}=$value;
if (exists $params{sortas}) {
$pagestate{$page}{meta}{titlesort}=$params{sortas};
}
else {
delete $pagestate{$page}{meta}{titlesort};
}
return "";
}
elsif ($key eq 'description') {
$pagestate{$page}{meta}{description}=$value;
# fallthrough
}
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elsif ($key eq 'guid') {
$pagestate{$page}{meta}{guid}=$value;
# fallthrough
}
elsif ($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
add_link($page, $value);
return "";
}
elsif ($key eq 'author') {
$pagestate{$page}{meta}{author}=$value;
if (exists $params{sortas}) {
$pagestate{$page}{meta}{authorsort}=$params{sortas};
}
else {
delete $pagestate{$page}{meta}{authorsort};
}
# fallthorough
}
elsif ($key eq 'authorurl') {
$pagestate{$page}{meta}{authorurl}=$value if safeurl($value);
# fallthrough
}
elsif ($key eq 'permalink') {
$pagestate{$page}{meta}{permalink}=$value if safeurl($value);
# fallthrough
}
elsif ($key eq 'date') {
eval q{use Date::Parse};
if (! $@) {
my $time = str2time($value);
$IkiWiki::pagectime{$page}=$time if defined $time;
}
}
elsif ($key eq 'updated') {
eval q{use Date::Parse};
if (! $@) {
my $time = str2time($value);
$pagestate{$page}{meta}{updated}=$time if defined $time;
}
}
if (! defined wantarray) {
# avoid collecting duplicate data during scan pass
return;
}
# Metadata handling that happens only during preprocessing pass.
if ($key eq 'permalink') {
if (safeurl($value)) {
push @{$metaheaders{$page}}, scrub('<link rel="bookmark" href="'.encode_entities($value).'" />', $page, $destpage);
}
}
elsif ($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 $stylesheet) {
error gettext("stylesheet not found")
}
push @{$metaheaders{$page}}, scrub('<link href="'.urlto($stylesheet, $page).
'" rel="'.encode_entities($rel).
'" title="'.encode_entities($title).
"\" type=\"text/css\" />", $page, $destpage);
}
elsif ($key eq 'script') {
my $defer=exists $params{defer} ? ' defer="defer"' : '';
my $async=exists $params{async} ? ' async="async"' : '';
my $js=bestlink($page, $value.".js");
if (! length $js) {
error gettext("script not found");
}
push @{$metaheaders{$page}}, scrub('<script src="'.urlto($js, $page).
'"' . $defer . $async . ' type="text/javascript"></script>',
$page, $destpage);
}
elsif ($key eq 'openid') {
my $delegate=0; # both by default
if (exists $params{delegate}) {
$delegate = 1 if lc $params{delegate} eq 'openid';
$delegate = 2 if lc $params{delegate} eq 'openid2';
}
if (exists $params{server} && safeurl($params{server})) {
push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
'" rel="openid.server" />' if $delegate ne 2;
push @{$metaheaders{$page}}, '<link href="'.encode_entities($params{server}).
'" rel="openid2.provider" />' if $delegate ne 1;
}
if (safeurl($value)) {
push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
'" rel="openid.delegate" />' if $delegate ne 2;
push @{$metaheaders{$page}}, '<link href="'.encode_entities($value).
'" rel="openid2.local_id" />' if $delegate ne 1;
}
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if (exists $params{"xrds-location"} && safeurl($params{"xrds-location"})) {
# force url absolute
eval q{use URI};
error($@) if $@;
my $url=URI->new_abs($params{"xrds-location"}, $config{url});
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push @{$metaheaders{$page}}, '<meta http-equiv="X-XRDS-Location" '.
'content="'.encode_entities($url).'" />';
}
}
elsif ($key eq 'foaf') {
if (safeurl($value)) {
push @{$metaheaders{$page}}, '<link rel="meta" '.
'type="application/rdf+xml" title="FOAF" '.
'href="'.encode_entities($value).'" />';
}
}
elsif ($key eq 'redir') {
return "" if $page ne $destpage;
my $safe=0;
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if ($value !~ /^\w+:\/\//) {
my ($redir_page, $redir_anchor) = split /\#/, $value;
my $link=bestlink($page, $redir_page);
if (! length $link) {
error gettext("redir page not found")
}
add_depends($page, $link, deptype("presence"));
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$value=urlto($link, $page);
$value.='#'.$redir_anchor if defined $redir_anchor;
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$safe=1;
# redir cycle detection
$pagestate{$page}{meta}{redir}=$link;
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my $at=$page;
my %seen;
while (exists $pagestate{$at}{meta}{redir}) {
if ($seen{$at}) {
error gettext("redir cycle is not allowed")
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}
$seen{$at}=1;
$at=$pagestate{$at}{meta}{redir};
}
}
else {
$value=encode_entities($value);
}
my $delay=int(exists $params{delay} ? $params{delay} : 0);
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my $redir="<meta http-equiv=\"refresh\" content=\"$delay; URL=$value\" />";
if (! $safe) {
$redir=scrub($redir, $page, $destpage);
}
push @{$metaheaders{$page}}, $redir;
}
elsif ($key eq 'link') {
if (%params) {
push @{$metaheaders{$page}}, scrub("<link href=\"".encode_entities($value)."\" ".
join(" ", map {
encode_entities($_)."=\"".encode_entities(decode_entities($params{$_}))."\""
} keys %params).
" />\n", $page, $destpage);
}
}
elsif ($key eq 'robots') {
push @{$metaheaders{$page}}, '<meta name="robots"'.
' content="'.encode_entities($value).'" />';
}
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elsif ($key eq 'description' || $key eq 'author') {
push @{$metaheaders{$page}}, '<meta name="'.$key.
'" content="'.encode_entities($value).'" />';
}
elsif ($key eq 'name') {
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push @{$metaheaders{$page}}, scrub('<meta name="'.
encode_entities($value).
join(' ', map { "$_=\"$params{$_}\"" } keys %params).
' />', $page, $destpage);
}
elsif ($key eq 'keywords') {
# Make sure the keyword string is safe: only allow alphanumeric
# characters, space and comma and strip the rest.
$value =~ s/[^[:alnum:], ]+//g;
push @{$metaheaders{$page}}, '<meta name="keywords"'.
' content="'.encode_entities($value).'" />';
}
else {
push @{$metaheaders{$page}}, scrub('<meta name="'.
encode_entities($key).'" content="'.
encode_entities($value).'" />', $page, $destpage);
}
return "";
}
sub pagetemplate (@) {
my %params=@_;
my $page=$params{page};
my $destpage=$params{destpage};
my $template=$params{template};
if (exists $metaheaders{$page} && $template->query(name => "meta")) {
# avoid duplicate meta lines
my %seen;
$template->param(meta => join("\n", grep { (! $seen{$_}) && ($seen{$_}=1) } @{$metaheaders{$page}}));
}
if (exists $pagestate{$page}{meta}{title} && $template->query(name => "title")) {
eval q{use HTML::Entities};
$template->param(title => HTML::Entities::encode_numeric($pagestate{$page}{meta}{title}));
$template->param(title_overridden => 1);
}
foreach my $field (qw{authorurl}) {
eval q{use HTML::Entities};
$template->param($field => HTML::Entities::encode_entities($pagestate{$page}{meta}{$field}))
if exists $pagestate{$page}{meta}{$field} && $template->query(name => $field);
}
foreach my $field (qw{permalink}) {
if (exists $pagestate{$page}{meta}{$field} && $template->query(name => $field)) {
eval q{use HTML::Entities};
$template->param($field => HTML::Entities::encode_entities(IkiWiki::urlabs($pagestate{$page}{meta}{$field}, $config{url})));
}
}
foreach my $field (qw{description author}) {
eval q{use HTML::Entities};
$template->param($field => HTML::Entities::encode_numeric($pagestate{$page}{meta}{$field}))
if exists $pagestate{$page}{meta}{$field} && $template->query(name => $field);
}
foreach my $field (qw{license copyright}) {
if (exists $pagestate{$page}{meta}{$field} && $template->query(name => $field) &&
($page eq $destpage || ! exists $pagestate{$destpage}{meta}{$field} ||
$pagestate{$page}{meta}{$field} ne $pagestate{$destpage}{meta}{$field})) {
$template->param($field => htmlize($page, $destpage, $pagestate{$page}{meta}{$field}));
}
}
}
sub get_sort_key {
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my $page = shift;
my $meta = shift;
# e.g. titlesort (also makes sense for author)
my $key = $pagestate{$page}{meta}{$meta . "sort"};
return $key if defined $key;
# e.g. title
$key = $pagestate{$page}{meta}{$meta};
return $key if defined $key;
# fall back to closer-to-core things
if ($meta eq 'title') {
return pagetitle(IkiWiki::basename($page));
}
elsif ($meta eq 'date') {
return $IkiWiki::pagectime{$page};
}
elsif ($meta eq 'updated') {
return $IkiWiki::pagemtime{$page};
}
else {
return '';
}
}
sub match {
my $field=shift;
my $page=shift;
# turn glob into a safe regexp
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my $re=IkiWiki::glob2re(shift);
my $val;
if (exists $pagestate{$page}{meta}{$field}) {
$val=$pagestate{$page}{meta}{$field};
}
elsif ($field eq 'title') {
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$val = pagetitle($page);
}
if (defined $val) {
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if ($val=~$re) {
return IkiWiki::SuccessReason->new("$re matches $field of $page", $page => $IkiWiki::DEPEND_CONTENT, "" => 1);
}
else {
return IkiWiki::FailReason->new("$re does not match $field of $page", $page => $IkiWiki::DEPEND_CONTENT, "" => 1);
}
}
else {
return IkiWiki::FailReason->new("$page does not have a $field", $page => $IkiWiki::DEPEND_CONTENT);
}
}
package IkiWiki::PageSpec;
sub match_title ($$;@) {
IkiWiki::Plugin::meta::match("title", @_);
}
sub match_author ($$;@) {
IkiWiki::Plugin::meta::match("author", @_);
}
sub match_authorurl ($$;@) {
IkiWiki::Plugin::meta::match("authorurl", @_);
}
sub match_license ($$;@) {
IkiWiki::Plugin::meta::match("license", @_);
}
sub match_copyright ($$;@) {
IkiWiki::Plugin::meta::match("copyright", @_);
}
sub match_guid ($$;@) {
IkiWiki::Plugin::meta::match("guid", @_);
}
package IkiWiki::SortSpec;
sub cmp_meta {
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my $meta = shift;
error(gettext("sort=meta requires a parameter")) unless defined $meta;
if ($meta eq 'updated' || $meta eq 'date') {
return IkiWiki::Plugin::meta::get_sort_key($a, $meta)
<=>
IkiWiki::Plugin::meta::get_sort_key($b, $meta);
}
return IkiWiki::Plugin::meta::get_sort_key($a, $meta)
cmp
IkiWiki::Plugin::meta::get_sort_key($b, $meta);
}
# A prototype of how sort=title could behave in 4.0 or something
sub cmp_meta_title {
$_[0] = 'title';
return cmp_meta(@_);
}
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