includes/Metadata.php

   1 <?php
   2 /**
   3  *
   4  * Copyright 2004, Evan Prodromou <evan@wikitravel.org>.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * @author Evan Prodromou <evan@wikitravel.org>
  21  * @file
  22  */
  23
  24 abstract class RdfMetaData {
  25         const RDF_TYPE_PREFS = 'application/rdf+xml,text/xml;q=0.7,application/xml;q=0.5,text/rdf;q=0.1';
  26
  27         /**
  28          * Constructor
  29          * @param $article Article object
  30          */
  31         public function __construct( Article $article ) {
  32                 $this->mArticle = $article;
  33         }
  34
  35         public abstract function show();
  36
  37         protected function setup() {
  38                 global $wgOut, $wgRequest;
  39
  40                 $httpaccept = isset( $_SERVER['HTTP_ACCEPT'] ) ? $_SERVER['HTTP_ACCEPT'] : null;
  41                 $rdftype = wfNegotiateType( wfAcceptToPrefs( $httpaccept ), wfAcceptToPrefs( self::RDF_TYPE_PREFS ) );
  42
  43                 if( !$rdftype ){
  44                         wfHttpError( 406, 'Not Acceptable', wfMsg( 'notacceptable' ) );
  45                         return false;
  46                 } else {
  47                         $wgOut->disable();
  48                         $wgRequest->response()->header( "Content-type: {$rdftype}; charset=utf-8" );
  49                         $wgOut->sendCacheControl();
  50                         return true;
  51                 }
  52         }
  53
  54         protected function reallyFullUrl() {
  55                 return $this->mArticle->getTitle()->getFullURL();
  56         }
  57
  58         protected function basics() {
  59                 global $wgLanguageCode, $wgSitename;
  60
  61                 $this->element( 'title', $this->mArticle->mTitle->getText() );
  62                 $this->pageOrString( 'publisher', wfMsg( 'aboutpage' ), $wgSitename );
  63                 $this->element( 'language', $wgLanguageCode );
  64                 $this->element( 'type', 'Text' );
  65                 $this->element( 'format', 'text/html' );
  66                 $this->element( 'identifier', $this->reallyFullUrl() );
  67                 $this->element( 'date', $this->date( $this->mArticle->getTimestamp() ) );
  68
  69                 $lastEditor = User::newFromId( $this->mArticle->getUser() );
  70                 $this->person( 'creator', $lastEditor );
  71
  72                 foreach( $this->mArticle->getContributors() as $user ){
  73                         $this->person( 'contributor', $user );
  74                 }
  75
  76                 $this->rights();
  77         }
  78
  79         protected function element( $name, $value ) {
  80                 $value = htmlspecialchars( $value );
  81                 print "\t\t<dc:{$name}>{$value}</dc:{$name}>\n";
  82         }
  83
  84         protected function date($timestamp) {
  85                 return substr($timestamp, 0, 4) . '-'
  86                   . substr($timestamp, 4, 2) . '-'
  87                   . substr($timestamp, 6, 2);
  88         }
  89
  90         protected function pageOrString( $name, $page, $str ) {
  91                 if( $page instanceof Title ) {
  92                         $nt = $page;
  93                 } else {
  94                         $nt = Title::newFromText( $page );
  95                 }
  96
  97                 if( !$nt || $nt->getArticleID() == 0 ){
  98                         $this->element( $name, $str );
  99                 } else {
 100                         $this->page( $name, $nt );
 101                 }
 102         }
 103
 104         protected function page( $name, $title ) {
 105                 $this->url( $name, $title->getFullUrl() );
 106         }
 107
 108         protected function url($name, $url) {
 109                 $url = htmlspecialchars( $url );
 110                 print "\t\t<dc:{$name} rdf:resource=\"{$url}\" />\n";
 111         }
 112
 113         protected function person( $name, User $user ) {
 114                 if( $user->isAnon() ){
 115                         $this->element( $name, wfMsgExt( 'anonymous', array( 'parsemag' ), 1 ) );
 116                 } else {
 117                         $real = $user->getRealName();
 118                         if( $real ) {
 119                                 $this->element( $name, $real );
 120                         } else {
 121                                 $userName = $user->getName();
 122                                 $this->pageOrString( $name, $user->getUserPage(), wfMsgExt( 'siteuser', 'parsemag', $userName, $userName ) );
 123                         }
 124                 }
 125         }
 126
 127         /**
 128          * Takes an arg, for future enhancement with different rights for
 129          * different pages.
 130          */
 131         protected function rights() {
 132                 global $wgRightsPage, $wgRightsUrl, $wgRightsText;
 133
 134                 if( $wgRightsPage && ( $nt = Title::newFromText( $wgRightsPage ) )
 135                         && ($nt->getArticleID() != 0)) {
 136                         $this->page('rights', $nt);
 137                 } else if( $wgRightsUrl ){
 138                         $this->url('rights', $wgRightsUrl);
 139                 } else if( $wgRightsText ){
 140                         $this->element( 'rights', $wgRightsText );
 141                 }
 142         }
 143
 144         protected function getTerms( $url ){
 145                 global $wgLicenseTerms;
 146
 147                 if( $wgLicenseTerms ){
 148                         return $wgLicenseTerms;
 149                 } else {
 150                         $known = $this->getKnownLicenses();
 151                         if( isset( $known[$url] ) ) {
 152                                 return $known[$url];
 153                         } else {
 154                                 return array();
 155                         }
 156                 }
 157         }
 158
 159         protected function getKnownLicenses() {
 160                 $ccLicenses = array('by', 'by-nd', 'by-nd-nc', 'by-nc',
 161                                                         'by-nc-sa', 'by-sa');
 162                 $ccVersions = array('1.0', '2.0');
 163                 $knownLicenses = array();
 164
 165                 foreach ($ccVersions as $version) {
 166                         foreach ($ccLicenses as $license) {
 167                                 if( $version == '2.0' && substr( $license, 0, 2) != 'by' ) {
 168                                         # 2.0 dropped the non-attribs licenses
 169                                         continue;
 170                                 }
 171                                 $lurl = "http://creativecommons.org/licenses/{$license}/{$version}/";
 172                                 $knownLicenses[$lurl] = explode('-', $license);
 173                                 $knownLicenses[$lurl][] = 're';
 174                                 $knownLicenses[$lurl][] = 'di';
 175                                 $knownLicenses[$lurl][] = 'no';
 176                                 if (!in_array('nd', $knownLicenses[$lurl])) {
 177                                         $knownLicenses[$lurl][] = 'de';
 178                                 }
 179                         }
 180                 }
 181
 182                 /* Handle the GPL and LGPL, too. */
 183
 184                 $knownLicenses['http://creativecommons.org/licenses/GPL/2.0/'] =
 185                   array('de', 're', 'di', 'no', 'sa', 'sc');
 186                 $knownLicenses['http://creativecommons.org/licenses/LGPL/2.1/'] =
 187                   array('de', 're', 'di', 'no', 'sa', 'sc');
 188                 $knownLicenses['http://www.gnu.org/copyleft/fdl.html'] =
 189                   array('de', 're', 'di', 'no', 'sa', 'sc');
 190
 191                 return $knownLicenses;
 192         }
 193 }
 194