Metadata.php

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<?php
abstract class RdfMetaData {
        const RDF_TYPE_PREFS = 'application/rdf+xml,text/xml;q=0.7,application/xml;q=0.5,text/rdf;q=0.1';

        public function __construct( Page $article ) {
                $this->mArticle = $article;
        }

        public abstract function show();

        protected function setup() {
                global $wgOut, $wgRequest;

                $httpaccept = isset( $_SERVER['HTTP_ACCEPT'] ) ? $_SERVER['HTTP_ACCEPT'] : null;
                $rdftype = wfNegotiateType( wfAcceptToPrefs( $httpaccept ), wfAcceptToPrefs( self::RDF_TYPE_PREFS ) );

                if( !$rdftype ){
                        throw new HttpError( 406, wfMessage( 'notacceptable' ) );
                }

                $wgOut->disable();
                $wgRequest->response()->header( "Content-type: {$rdftype}; charset=utf-8" );
                $wgOut->sendCacheControl();
                return true;
        }

        protected function reallyFullUrl() {
                return $this->mArticle->getTitle()->getFullURL();
        }

        protected function basics() {
                global $wgLanguageCode, $wgSitename;

                $this->element( 'title', $this->mArticle->getTitle()->getText() );
                $this->pageOrString( 'publisher', wfMsg( 'aboutpage' ), $wgSitename );
                $this->element( 'language', $wgLanguageCode );
                $this->element( 'type', 'Text' );
                $this->element( 'format', 'text/html' );
                $this->element( 'identifier', $this->reallyFullUrl() );
                $this->element( 'date', $this->date( $this->mArticle->getTimestamp() ) );

                $lastEditor = User::newFromId( $this->mArticle->getUser() );
                $this->person( 'creator', $lastEditor );

                foreach( $this->mArticle->getContributors() as $user ){
                        $this->person( 'contributor', $user );
                }

                $this->rights();
        }

        protected function element( $name, $value ) {
                $value = htmlspecialchars( $value );
                print "\t\t<dc:{$name}>{$value}</dc:{$name}>\n";
        }

        protected function date($timestamp) {
                return substr($timestamp, 0, 4) . '-'
                  . substr($timestamp, 4, 2) . '-'
                  . substr($timestamp, 6, 2);
        }

        protected function pageOrString( $name, $page, $str ) {
                if( $page instanceof Title ) {
                        $nt = $page;
                } else {
                        $nt = Title::newFromText( $page );
                }

                if( !$nt || $nt->getArticleID() == 0 ){
                        $this->element( $name, $str );
                } else {
                        $this->page( $name, $nt );
                }
        }

        protected function page( $name, $title ) {
                $this->url( $name, $title->getFullUrl() );
        }

        protected function url($name, $url) {
                $url = htmlspecialchars( $url );
                print "\t\t<dc:{$name} rdf:resource=\"{$url}\" />\n";
        }

        protected function person( $name, User $user ) {
                if( $user->isAnon() ){
                        $this->element( $name, wfMsgExt( 'anonymous', array( 'parsemag' ), 1 ) );
                } else {
                        $real = $user->getRealName();
                        if( $real ) {
                                $this->element( $name, $real );
                        } else {
                                $userName = $user->getName();
                                $this->pageOrString( $name, $user->getUserPage(), wfMsgExt( 'siteuser', 'parsemag', $userName, $userName ) );
                        }
                }
        }

        protected function rights() {
                global $wgRightsPage, $wgRightsUrl, $wgRightsText;

                if( $wgRightsPage && ( $nt = Title::newFromText( $wgRightsPage ) )
                        && ($nt->getArticleID() != 0)) {
                        $this->page('rights', $nt);
                } elseif( $wgRightsUrl ){
                        $this->url('rights', $wgRightsUrl);
                } elseif( $wgRightsText ){
                        $this->element( 'rights', $wgRightsText );
                }
        }

        protected function getTerms( $url ){
                global $wgLicenseTerms;

                if( $wgLicenseTerms ){
                        return $wgLicenseTerms;
                } else {
                        $known = $this->getKnownLicenses();
                        if( isset( $known[$url] ) ) {
                                return $known[$url];
                        } else {
                                return array();
                        }
                }
        }

        protected function getKnownLicenses() {
                $ccLicenses = array('by', 'by-nd', 'by-nd-nc', 'by-nc',
                                                        'by-nc-sa', 'by-sa');
                $ccVersions = array('1.0', '2.0');
                $knownLicenses = array();

                foreach ($ccVersions as $version) {
                        foreach ($ccLicenses as $license) {
                                if( $version == '2.0' && substr( $license, 0, 2) != 'by' ) {
                                        # 2.0 dropped the non-attribs licenses
                                        continue;
                                }
                                $lurl = "http://creativecommons.org/licenses/{$license}/{$version}/";
                                $knownLicenses[$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;
        }
}