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( Page $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                         throw new HttpError( 406, wfMessage( 'notacceptable' ) );
  45                 }
  46
  47                 $wgOut->disable();
  48                 $wgRequest->response()->header( "Content-type: {$rdftype}; charset=utf-8" );
  49                 $wgOut->sendCacheControl();
  50                 return true;
  51         }
  52
  53         protected function reallyFullUrl() {
  54                 return $this->mArticle->getTitle()->getFullURL();
  55         }
  56
  57         protected function basics() {
  58                 global $wgLanguageCode, $wgSitename;
  59
  60                 $this->element( 'title', $this->mArticle->getTitle()->getText() );
  61                 $this->pageOrString( 'publisher', wfMsg( 'aboutpage' ), $wgSitename );
  62                 $this->element( 'language', $wgLanguageCode );
  63                 $this->element( 'type', 'Text' );
  64                 $this->element( 'format', 'text/html' );
  65                 $this->element( 'identifier', $this->reallyFullUrl() );
  66                 $this->element( 'date', $this->date( $this->mArticle->getTimestamp() ) );
  67
  68                 $lastEditor = User::newFromId( $this->mArticle->getUser() );
  69                 $this->person( 'creator', $lastEditor );
  70
  71                 foreach( $this->mArticle->getContributors() as $user ){
  72                         $this->person( 'contributor', $user );
  73                 }
  74
  75                 $this->rights();
  76         }
  77
  78         protected function element( $name, $value ) {
  79                 $value = htmlspecialchars( $value );
  80                 print "\t\t<dc:{$name}>{$value}</dc:{$name}>\n";
  81         }
  82
  83         protected function date($timestamp) {
  84                 return substr($timestamp, 0, 4) . '-'
  85                   . substr($timestamp, 4, 2) . '-'
  86                   . substr($timestamp, 6, 2);
  87         }
  88
  89         protected function pageOrString( $name, $page, $str ) {
  90                 if( $page instanceof Title ) {
  91                         $nt = $page;
  92                 } else {
  93                         $nt = Title::newFromText( $page );
  94                 }
  95
  96                 if( !$nt || $nt->getArticleID() == 0 ){
  97                         $this->element( $name, $str );
  98                 } else {
  99                         $this->page( $name, $nt );
 100                 }
 101         }
 102
 103         /**
 104          * @param $name string
 105          * @param $title Title
 106          */
 107         protected function page( $name, $title ) {
 108                 $this->url( $name, $title->getFullUrl() );
 109         }
 110
 111         protected function url($name, $url) {
 112                 $url = htmlspecialchars( $url );
 113                 print "\t\t<dc:{$name} rdf:resource=\"{$url}\" />\n";
 114         }
 115
 116         protected function person( $name, User $user ) {
 117                 if( $user->isAnon() ){
 118                         $this->element( $name, wfMsgExt( 'anonymous', array( 'parsemag' ), 1 ) );
 119                 } else {
 120                         $real = $user->getRealName();
 121                         if( $real ) {
 122                                 $this->element( $name, $real );
 123                         } else {
 124                                 $userName = $user->getName();
 125                                 $this->pageOrString( $name, $user->getUserPage(), wfMsgExt( 'siteuser', 'parsemag', $userName, $userName ) );
 126                         }
 127                 }
 128         }
 129
 130         /**
 131          * Takes an arg, for future enhancement with different rights for
 132          * different pages.
 133          */
 134         protected function rights() {
 135                 global $wgRightsPage, $wgRightsUrl, $wgRightsText;
 136
 137                 if( $wgRightsPage && ( $nt = Title::newFromText( $wgRightsPage ) )
 138                         && ($nt->getArticleID() != 0)) {
 139                         $this->page('rights', $nt);
 140                 } elseif( $wgRightsUrl ){
 141                         $this->url('rights', $wgRightsUrl);
 142                 } elseif( $wgRightsText ){
 143                         $this->element( 'rights', $wgRightsText );
 144                 }
 145         }
 146
 147         protected function getTerms( $url ){
 148                 global $wgLicenseTerms;
 149
 150                 if( $wgLicenseTerms ){
 151                         return $wgLicenseTerms;
 152                 } else {
 153                         $known = $this->getKnownLicenses();
 154                         if( isset( $known[$url] ) ) {
 155                                 return $known[$url];
 156                         } else {
 157                                 return array();
 158                         }
 159                 }
 160         }
 161
 162         protected function getKnownLicenses() {
 163                 $ccLicenses = array('by', 'by-nd', 'by-nd-nc', 'by-nc',
 164                                                         'by-nc-sa', 'by-sa');
 165                 $ccVersions = array('1.0', '2.0');
 166                 $knownLicenses = array();
 167
 168                 foreach ($ccVersions as $version) {
 169                         foreach ($ccLicenses as $license) {
 170                                 if( $version == '2.0' && substr( $license, 0, 2) != 'by' ) {
 171                                         # 2.0 dropped the non-attribs licenses
 172                                         continue;
 173                                 }
 174                                 $lurl = "http://creativecommons.org/licenses/{$license}/{$version}/";
 175                                 $knownLicenses[$lurl] = explode('-', $license);
 176                                 $knownLicenses[$lurl][] = 're';
 177                                 $knownLicenses[$lurl][] = 'di';
 178                                 $knownLicenses[$lurl][] = 'no';
 179                                 if (!in_array('nd', $knownLicenses[$lurl])) {
 180                                         $knownLicenses[$lurl][] = 'de';
 181                                 }
 182                         }
 183                 }
 184
 185                 /* Handle the GPL and LGPL, too. */
 186
 187                 $knownLicenses['http://creativecommons.org/licenses/GPL/2.0/'] =
 188                   array('de', 're', 'di', 'no', 'sa', 'sc');
 189                 $knownLicenses['http://creativecommons.org/licenses/LGPL/2.1/'] =
 190                   array('de', 're', 'di', 'no', 'sa', 'sc');
 191                 $knownLicenses['http://www.gnu.org/copyleft/fdl.html'] =
 192                   array('de', 're', 'di', 'no', 'sa', 'sc');
 193
 194                 return $knownLicenses;
 195         }
 196 }
 197