includes/api/ApiQueryImages.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on May 13, 2007
   6  *
   7  * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * This query adds an <images> subelement to all pages with the list of images embedded into those pages.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryImages extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'im' );
  36         }
  37
  38         public function execute() {
  39                 $this->run();
  40         }
  41
  42         public function executeGenerator( $resultPageSet ) {
  43                 $this->run( $resultPageSet );
  44         }
  45
  46         /**
  47          * @param $resultPageSet ApiPageSet
  48          */
  49         private function run( $resultPageSet = null ) {
  50                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  51                         return; // nothing to do
  52                 }
  53
  54                 $params = $this->extractRequestParams();
  55                 $this->addFields( array(
  56                         'il_from',
  57                         'il_to'
  58                 ) );
  59
  60                 $this->addTables( 'imagelinks' );
  61                 $this->addWhereFld( 'il_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  62                 if ( !is_null( $params['continue'] ) ) {
  63                         $cont = explode( '|', $params['continue'] );
  64                         if ( count( $cont ) != 2 ) {
  65                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  66                                         'original value returned by the previous query', '_badcontinue' );
  67                         }
  68                         $op = $params['dir'] == 'descending' ? '<' : '>';
  69                         $ilfrom = intval( $cont[0] );
  70                         $ilto = $this->getDB()->addQuotes( $this->titleToKey( $cont[1] ) );
  71                         $this->addWhere(
  72                                 "il_from $op $ilfrom OR " .
  73                                 "(il_from = $ilfrom AND " .
  74                                 "il_to $op= $ilto)"
  75                         );
  76                 }
  77
  78                 $dir = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  79                 // Don't order by il_from if it's constant in the WHERE clause
  80                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  81                         $this->addOption( 'ORDER BY', 'il_to' . $dir );
  82                 } else {
  83                         $this->addOption( 'ORDER BY', array(
  84                                                 'il_from' . $dir,
  85                                                 'il_to' . $dir
  86                         ));
  87                 }
  88                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  89
  90                 if ( !is_null( $params['images'] ) ) {
  91                         $images = array();
  92                         foreach ( $params['images'] as $img ) {
  93                                 $title = Title::newFromText( $img );
  94                                 if ( !$title || $title->getNamespace() != NS_FILE ) {
  95                                         $this->setWarning( "\"$img\" is not a file" );
  96                                 } else {
  97                                         $images[] = $title->getDBkey();
  98                                 }
  99                         }
 100                         $this->addWhereFld( 'il_to', $images );
 101                 }
 102
 103                 $res = $this->select( __METHOD__ );
 104
 105                 if ( is_null( $resultPageSet ) ) {
 106                         $count = 0;
 107                         foreach ( $res as $row ) {
 108                                 if ( ++$count > $params['limit'] ) {
 109                                         // We've reached the one extra which shows that
 110                                         // there are additional pages to be had. Stop here...
 111                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 112                                                         '|' . $this->keyToTitle( $row->il_to ) );
 113                                         break;
 114                                 }
 115                                 $vals = array();
 116                                 ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( NS_FILE, $row->il_to ) );
 117                                 $fit = $this->addPageSubItem( $row->il_from, $vals );
 118                                 if ( !$fit ) {
 119                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 120                                                         '|' . $this->keyToTitle( $row->il_to ) );
 121                                         break;
 122                                 }
 123                         }
 124                 } else {
 125                         $titles = array();
 126                         $count = 0;
 127                         foreach ( $res as $row ) {
 128                                 if ( ++$count > $params['limit'] ) {
 129                                         // We've reached the one extra which shows that
 130                                         // there are additional pages to be had. Stop here...
 131                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 132                                                         '|' . $this->keyToTitle( $row->il_to ) );
 133                                         break;
 134                                 }
 135                                 $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
 136                         }
 137                         $resultPageSet->populateFromTitles( $titles );
 138                 }
 139         }
 140
 141         public function getCacheMode( $params ) {
 142                 return 'public';
 143         }
 144
 145         public function getAllowedParams() {
 146                 return array(
 147                         'limit' => array(
 148                                 ApiBase::PARAM_DFLT => 10,
 149                                 ApiBase::PARAM_TYPE => 'limit',
 150                                 ApiBase::PARAM_MIN => 1,
 151                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 152                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 153                         ),
 154                         'continue' => null,
 155                         'images' => array(
 156                                 ApiBase::PARAM_ISMULTI => true,
 157                         ),
 158                         'dir' => array(
 159                                 ApiBase::PARAM_DFLT => 'ascending',
 160                                 ApiBase::PARAM_TYPE => array(
 161                                         'ascending',
 162                                         'descending'
 163                                 )
 164                         ),
 165                 );
 166         }
 167
 168         public function getParamDescription() {
 169                 return array(
 170                         'limit' => 'How many images to return',
 171                         'continue' => 'When more results are available, use this to continue',
 172                         'images' => 'Only list these images. Useful for checking whether a certain page has a certain Image.',
 173                         'dir' => 'The direction in which to list',
 174                 );
 175         }
 176
 177         public function getDescription() {
 178                 return 'Returns all images contained on the given page(s)';
 179         }
 180
 181         public function getPossibleErrors() {
 182                 return array_merge( parent::getPossibleErrors(), array(
 183                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 184                 ) );
 185         }
 186
 187         public function getExamples() {
 188                 return array(
 189                         'api.php?action=query&prop=images&titles=Main%20Page' => 'Get a list of images used in the [[Main Page]]',
 190                         'api.php?action=query&generator=images&titles=Main%20Page&prop=info' => 'Get information about all images used in the [[Main Page]]',
 191                 );
 192         }
 193
 194         public function getHelpUrls() {
 195                 return 'https://www.mediawiki.org/wiki/API:Properties#images_.2F_im';
 196         }
 197
 198         public function getVersion() {
 199                 return __CLASS__ . ': $Id$';
 200         }
 201 }