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<?php
/**
* Base code to format 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @author Evan Prodromou <evan@wikitravel.org>
* @file
*/
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';
/**
* Constructor
* @param $article Article object
*/
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', 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 );
}
}
/**
* @param $name string
* @param $title Title
*/
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, wfMessage( 'anonymous' )->numParams( 1 )->text() );
} else {
$real = $user->getRealName();
if( $real ) {
$this->element( $name, $real );
} else {
$userName = $user->getName();
$this->pageOrString(
$name,
$user->getUserPage(),
wfMessage( 'siteuser', $userName, $userName )->text()
);
}
}
}
/**
* Takes an arg, for future enhancement with different rights for
* different pages.
*/
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;
}
}
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