--- /dev/null
+<?php
+/* Metadata.php -- provides DublinCore and CreativeCommons metadata
+ * Copyright 2004, Evan Prodromou <evan@wikitravel.org>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+define(RDF_TYPE_PREFS, "application/rdf+xml,text/xml;q=0.7,application/xml;q=0.5,text/rdf;q=0.1");
+
+function wfDublinCoreRdf($article) {
+
+ $url = dcReallyFullUrl($article->mTitle);
+
+ if (rdfSetup()) {
+ dcPrologue($url);
+ dcBasics($article);
+ dcEpilogue();
+ }
+}
+
+function wfCreativeCommonsRdf($article) {
+
+ if (rdfSetup()) {
+ global $wgRightsUrl;
+
+ $url = dcReallyFullUrl($article->mTitle);
+
+ ccPrologue();
+ ccSubPrologue('Work', $url);
+ dcBasics($article);
+ if (isset($wgRightsUrl)) {
+ print " <cc:license rdf:resource=\"$wgRightsUrl\" />\n";
+ }
+
+ ccSubEpilogue('Work');
+
+ if (isset($wgRightsUrl)) {
+ $terms = ccGetTerms($wgRightsUrl);
+ if ($terms) {
+ ccSubPrologue('License', $wgRightsUrl);
+ ccLicense($terms);
+ ccSubEpilogue('License');
+ }
+ }
+ }
+
+ ccEpilogue();
+}
+
+/* private */ function rdfSetup() {
+ global $wgOut, $wgRdfMimeType, $_SERVER;
+
+ $rdftype = wfNegotiateType(wfAcceptToPrefs($_SERVER['HTTP_ACCEPT']), wfAcceptToPrefs(RDF_TYPE_PREFS));
+
+ if (!$rdftype) {
+ wfHttpError(406, "Not Acceptable", wfMsg("notacceptable"));
+ return false;
+ } else {
+ $wgOut->disable();
+ header( "Content-type: {$rdftype}" );
+ $wgOut->sendCacheControl();
+ return true;
+ }
+}
+
+/* private */ function dcPrologue($url) {
+ global $wgOutputEncoding;
+
+ print "<?xml version=\"1.0\" encoding=\"{$wgOutputEncoding}\" ?>
+
+<!DOCTYPE rdf:RDF PUBLIC \"-//DUBLIN CORE//DCMES DTD 2002/07/31//EN\" \"http://dublincore.org/documents/2002/07/31/dcmes-xml/dcmes-xml-dtd.dtd\">
+
+<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
+ xmlns:dc=\"http://purl.org/dc/elements/1.1/\">
+ <rdf:Description rdf:about=\"$url\">
+";
+}
+
+/* private */ function dcEpilogue() {
+ print "
+ </rdf:Description>
+</rdf:RDF>
+";
+}
+
+/* private */ function dcBasics($article) {
+ global $wgLanguageCode, $wgSitename;
+
+ dcElement('title', $article->mTitle->getText());
+ dcPageOrString('publisher', wfMsg('aboutpage'), $wgSitename);
+ dcElement('language', $wgLanguageCode);
+ dcElement('type', 'Text');
+ dcElement('format', 'text/html');
+ dcElement('identifier', dcReallyFullUrl($article->mTitle));
+ dcElement('date', dcDate($article->getTimestamp()));
+ dcPerson('creator', $article->getUser());
+
+ $contributors = dcContributors($article->mTitle);
+
+ foreach ($contributors as $cid) {
+ dcPerson('contributor', $cid);
+ }
+
+ dcRights($article);
+}
+
+/* private */ function ccPrologue() {
+ global $wgOutputEncoding;
+
+ echo "<?xml version='1.0' encoding='{$wgOutputEncoding}' ?>
+
+<rdf:RDF xmlns:cc=\"http://web.resource.org/cc/\"
+ xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
+ xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">
+";
+}
+
+/* private */ function ccSubPrologue($type, $url) {
+ echo " <cc:{$type} rdf:about=\"{$url}\">\n";
+}
+
+/* private */ function ccSubEpilogue($type) {
+ echo " </cc:{$type}>\n";
+}
+
+/* private */ function ccLicense($terms) {
+
+ foreach ($terms as $term) {
+ switch ($term) {
+ case 're':
+ ccTerm('permits', "Reproduction"); break;
+ case 'di':
+ ccTerm('permits', "Distribution"); break;
+ case 'de':
+ ccTerm('permits', "DerivativeWorks"); break;
+ case 'nc':
+ ccTerm('prohibits', "CommercialUse"); break;
+ case 'no':
+ ccTerm('requires', "Notice"); break;
+ case 'by':
+ ccTerm('requires', "Attribution"); break;
+ case 'sa':
+ ccTerm('requires', "ShareAlike"); break;
+ case 'sc':
+ ccTerm('requires', "SourceCode"); break;
+ }
+ }
+}
+
+/* private */ function ccTerm($term, $name) {
+ print " <cc:{$term} rdf:resource=\"http://web.resource.org/cc/{$name}\" />\n";
+}
+
+/* private */ function ccEpilogue() {
+ echo "</rdf:RDF>\n";
+}
+
+/* private */ function dcElement($name, $value) {
+ print " <dc:{$name}>{$value}</dc:{$name}>\n";
+}
+
+/* private */ function dcDate($timestamp) {
+ return substr($timestamp, 0, 4) . "-"
+ . substr($timestamp, 4, 2) . "-"
+ . substr($timestamp, 6, 2);
+}
+
+/* private */ function dcReallyFullUrl($title) {
+ $title->getFullURL();
+}
+
+/* private */ function dcPageOrString($name, $page, $str) {
+ $nt = Title::newFromText($page);
+
+ if (!$nt || $nt->getArticleID() == 0) {
+ dcElement($name, $str);
+ } else {
+ dcPage($name, $nt);
+ }
+}
+
+/* private */ function dcPage($name, $title) {
+ dcUrl($name, dcReallyFullUrl($title));
+}
+
+/* private */ function dcUrl($name, $url) {
+ print " <dc:{$name} rdf:resource=\"{$url}\" />\n";
+}
+
+/* private */ function dcPerson($name, $id) {
+ global $wgLang;
+
+ if ($id == 0) {
+ dcElement($name, wfMsg("anonymous"));
+ } else {
+ $user_name = User::whoIs($id);
+ dcPageOrString($name, $wgLang->getNsText(NS_USER) . ":" . $user_name, $user_name);
+ }
+}
+
+/* private */ function dcContributors($title) {
+
+ $contribs = array();
+
+ $res = wfQuery("SELECT DISTINCT old_user" .
+ " FROM old " .
+ " WHERE old_namespace = " . $title->getNamespace() .
+ " AND old_title = '" . $title->getDBkey() . "'", DB_READ);
+
+ while ( $line = wfFetchObject( $res ) ) {
+ $contribs[] = $line->old_user;
+ }
+
+ return $contribs;
+}
+
+/* Takes an arg, for future enhancement with different rights for
+ different pages. */
+
+/* private */ function dcRights($article) {
+
+ global $wgRightsPage, $wgRightsUrl, $wgRightsText;
+
+ if (isset($wgRightsPage) &&
+ ($nt = Title::newFromText($wgRightsPage))
+ && ($nt->getArticleID() != 0)) {
+ dcPage('rights', $nt);
+ } else if (isset($wgRightsUrl)) {
+ dcUrl('rights', $wgRightsUrl);
+ } else if (isset($wgRightsText)) {
+ dcElement('rights', $wgRightsText);
+ }
+}
+
+/* private */ function ccGetTerms($url) {
+ global $wgLicenseTerms;
+
+ if (isset($wgLicenseTerms)) {
+ return $wgLicenseTerms;
+ } else {
+ $known = getKnownLicenses();
+ return $known[$url];
+ }
+}
+
+/* private */ function getKnownLicenses() {
+
+ $ccLicenses = array('by', 'by-nd', 'by-nd-nc', 'by-nc',
+ 'by-nc-sa', 'by-sa', 'nd', 'nd-nc',
+ 'nc', 'nc-sa', 'sa');
+
+ $knownLicenses = array();
+
+ foreach ($ccLicenses as $license) {
+ $lurl = "http://creativecommons.org/licenses/{$license}/1.0/";
+ $knownLicenses[$lurl] = explode('-', $license);
+ $knownLicenses[$lurl][] = 're';
+ $knownLicenses[$lurl][] = 'di';
+ $knownLicenses[$lurl][] = 'no';
+ if (!in_array('nd', $knownLicenses[$lurl])) {
+ $knownLicenses[$lurl][] = 'de';
+ }
+ }
+
+ /* Handle the GPL and LGPL, too. */
+
+ $knownLicenses["http://creativecommons.org/licenses/GPL/2.0/"] =
+ array('de', 're', 'di', 'no', 'sa', 'sc');
+ $knownLicenses["http://creativecommons.org/licenses/LGPL/2.1/"] =
+ array('de', 're', 'di', 'no', 'sa', 'sc');
+ $knownLicenses["http://www.gnu.org/copyleft/fdl.html"] =
+ array('de', 're', 'di', 'no', 'sa', 'sc');
+
+ return $knownLicenses;
+}
+
+?>