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;
    }

    abstract public 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', wfMessage( 'aboutpage' )->text(), $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 ) {
        global $wgHiddenPrefs;

        if ( $user->isAnon() ) {
            $this->element( $name, wfMessage( 'anonymous' )->numParams( 1 )->text() );
        } else {
            $real = $user->getRealName();
            if ( $real && !in_array( 'realname', $wgHiddenPrefs ) ) {
                $this->element( $name, $real );
            } else {
                $userName = $user->getName();
                $this->pageOrString(
                    $name,
                    $user->getUserPage(),
                    wfMessage( 'siteuser', $userName, $userName )->text()
                );
            }
        }
    }

    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;
    }
}