includes/Metadata.php

   1 <?php
   2 /**
   3  * Base code to format metadata.
   4  *
   5  * Copyright 2004, Evan Prodromou <evan@wikitravel.org>.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @author Evan Prodromou <evan@wikitravel.org>
  23  * @file
  24  */
  25
  26 abstract class RdfMetaData {
  27         const RDF_TYPE_PREFS = 'application/rdf+xml,text/xml;q=0.7,application/xml;q=0.5,text/rdf;q=0.1';
  28
  29         /**
  30          * Constructor
  31          * @param $article Article object
  32          */
  33         public function __construct( Page $article ) {
  34                 $this->mArticle = $article;
  35         }
  36
  37         abstract public function show();
  38
  39         protected function setup() {
  40                 global $wgOut, $wgRequest;
  41
  42                 $httpaccept = isset( $_SERVER['HTTP_ACCEPT'] ) ? $_SERVER['HTTP_ACCEPT'] : null;
  43                 $rdftype = wfNegotiateType( wfAcceptToPrefs( $httpaccept ), wfAcceptToPrefs( self::RDF_TYPE_PREFS ) );
  44
  45                 if ( !$rdftype ) {
  46                         throw new HttpError( 406, wfMessage( 'notacceptable' ) );
  47                 }
  48
  49                 $wgOut->disable();
  50                 $wgRequest->response()->header( "Content-type: {$rdftype}; charset=utf-8" );
  51                 $wgOut->sendCacheControl();
  52                 return true;
  53         }
  54
  55         protected function reallyFullUrl() {
  56                 return $this->mArticle->getTitle()->getFullURL();
  57         }
  58
  59         protected function basics() {
  60                 global $wgLanguageCode, $wgSitename;
  61
  62                 $this->element( 'title', $this->mArticle->getTitle()->getText() );
  63                 $this->pageOrString( 'publisher', wfMessage( 'aboutpage' )->text(), $wgSitename );
  64                 $this->element( 'language', $wgLanguageCode );
  65                 $this->element( 'type', 'Text' );
  66                 $this->element( 'format', 'text/html' );
  67                 $this->element( 'identifier', $this->reallyFullUrl() );
  68                 $this->element( 'date', $this->date( $this->mArticle->getTimestamp() ) );
  69
  70                 $lastEditor = User::newFromId( $this->mArticle->getUser() );
  71                 $this->person( 'creator', $lastEditor );
  72
  73                 foreach ( $this->mArticle->getContributors() as $user ) {
  74                         $this->person( 'contributor', $user );
  75                 }
  76
  77                 $this->rights();
  78         }
  79
  80         protected function element( $name, $value ) {
  81                 $value = htmlspecialchars( $value );
  82                 print "\t\t<dc:{$name}>{$value}</dc:{$name}>\n";
  83         }
  84
  85         protected function date( $timestamp ) {
  86                 return substr( $timestamp, 0, 4 ) . '-'
  87                         . substr( $timestamp, 4, 2 ) . '-'
  88                         . substr( $timestamp, 6, 2 );
  89         }
  90
  91         protected function pageOrString( $name, $page, $str ) {
  92                 if ( $page instanceof Title ) {
  93                         $nt = $page;
  94                 } else {
  95                         $nt = Title::newFromText( $page );
  96                 }
  97
  98                 if ( !$nt || $nt->getArticleID() == 0 ) {
  99                         $this->element( $name, $str );
 100                 } else {
 101                         $this->page( $name, $nt );
 102                 }
 103         }
 104
 105         /**
 106          * @param $name string
 107          * @param $title Title
 108          */
 109         protected function page( $name, $title ) {
 110                 $this->url( $name, $title->getFullURL() );
 111         }
 112
 113         protected function url( $name, $url ) {
 114                 $url = htmlspecialchars( $url );
 115                 print "\t\t<dc:{$name} rdf:resource=\"{$url}\" />\n";
 116         }
 117
 118         protected function person( $name, User $user ) {
 119                 if ( $user->isAnon() ) {
 120                         $this->element( $name, wfMessage( 'anonymous' )->numParams( 1 )->text() );
 121                 } else {
 122                         $real = $user->getRealName();
 123                         if ( $real ) {
 124                                 $this->element( $name, $real );
 125                         } else {
 126                                 $userName = $user->getName();
 127                                 $this->pageOrString(
 128                                         $name,
 129                                         $user->getUserPage(),
 130                                         wfMessage( 'siteuser', $userName, $userName )->text()
 131                                 );
 132                         }
 133                 }
 134         }
 135
 136         /**
 137          * Takes an arg, for future enhancement with different rights for
 138          * different pages.
 139          */
 140         protected function rights() {
 141                 global $wgRightsPage, $wgRightsUrl, $wgRightsText;
 142
 143                 if ( $wgRightsPage && ( $nt = Title::newFromText( $wgRightsPage ) )
 144                         && ( $nt->getArticleID() != 0 ) ) {
 145                         $this->page( 'rights', $nt );
 146                 } elseif ( $wgRightsUrl ) {
 147                         $this->url( 'rights', $wgRightsUrl );
 148                 } elseif ( $wgRightsText ) {
 149                         $this->element( 'rights', $wgRightsText );
 150                 }
 151         }
 152
 153         protected function getTerms( $url ) {
 154                 global $wgLicenseTerms;
 155
 156                 if ( $wgLicenseTerms ) {
 157                         return $wgLicenseTerms;
 158                 } else {
 159                         $known = $this->getKnownLicenses();
 160                         if ( isset( $known[$url] ) ) {
 161                                 return $known[$url];
 162                         } else {
 163                                 return array();
 164                         }
 165                 }
 166         }
 167
 168         protected function getKnownLicenses() {
 169                 $ccLicenses = array( 'by', 'by-nd', 'by-nd-nc', 'by-nc',
 170                                                         'by-nc-sa', 'by-sa' );
 171                 $ccVersions = array( '1.0', '2.0' );
 172                 $knownLicenses = array();
 173
 174                 foreach ( $ccVersions as $version ) {
 175                         foreach ( $ccLicenses as $license ) {
 176                                 if ( $version == '2.0' && substr( $license, 0, 2 ) != 'by' ) {
 177                                         # 2.0 dropped the non-attribs licenses
 178                                         continue;
 179                                 }
 180                                 $lurl = "http://creativecommons.org/licenses/{$license}/{$version}/";
 181                                 $knownLicenses[$lurl] = explode( '-', $license );
 182                                 $knownLicenses[$lurl][] = 're';
 183                                 $knownLicenses[$lurl][] = 'di';
 184                                 $knownLicenses[$lurl][] = 'no';
 185                                 if ( !in_array( 'nd', $knownLicenses[$lurl] ) ) {
 186                                         $knownLicenses[$lurl][] = 'de';
 187                                 }
 188                         }
 189                 }
 190
 191                 /* Handle the GPL and LGPL, too. */
 192
 193                 $knownLicenses['http://creativecommons.org/licenses/GPL/2.0/'] =
 194                         array( 'de', 're', 'di', 'no', 'sa', 'sc' );
 195                 $knownLicenses['http://creativecommons.org/licenses/LGPL/2.1/'] =
 196                         array( 'de', 're', 'di', 'no', 'sa', 'sc' );
 197                 $knownLicenses['http://www.gnu.org/copyleft/fdl.html'] =
 198                         array( 'de', 're', 'di', 'no', 'sa', 'sc' );
 199
 200                 return $knownLicenses;
 201         }
 202 }