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
  29  * images embedded into those pages.
  30  *
  31  * @ingroup API
  32  */
  33 class ApiQueryImages extends ApiQueryGeneratorBase {
  34
  35         public function __construct( ApiQuery $query, $moduleName ) {
  36                 parent::__construct( $query, $moduleName, 'im' );
  37         }
  38
  39         public function execute() {
  40                 $this->run();
  41         }
  42
  43         public function executeGenerator( $resultPageSet ) {
  44                 $this->run( $resultPageSet );
  45         }
  46
  47         /**
  48          * @param ApiPageSet $resultPageSet
  49          */
  50         private function run( $resultPageSet = null ) {
  51                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  52                         return; // nothing to do
  53                 }
  54
  55                 $params = $this->extractRequestParams();
  56                 $this->addFields( array(
  57                         'il_from',
  58                         'il_to'
  59                 ) );
  60
  61                 $this->addTables( 'imagelinks' );
  62                 $this->addWhereFld( 'il_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  63                 if ( !is_null( $params['continue'] ) ) {
  64                         $cont = explode( '|', $params['continue'] );
  65                         $this->dieContinueUsageIf( count( $cont ) != 2 );
  66                         $op = $params['dir'] == 'descending' ? '<' : '>';
  67                         $ilfrom = intval( $cont[0] );
  68                         $ilto = $this->getDB()->addQuotes( $cont[1] );
  69                         $this->addWhere(
  70                                 "il_from $op $ilfrom OR " .
  71                                 "(il_from = $ilfrom AND " .
  72                                 "il_to $op= $ilto)"
  73                         );
  74                 }
  75
  76                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  77                 // Don't order by il_from if it's constant in the WHERE clause
  78                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  79                         $this->addOption( 'ORDER BY', 'il_to' . $sort );
  80                 } else {
  81                         $this->addOption( 'ORDER BY', array(
  82                                 'il_from' . $sort,
  83                                 'il_to' . $sort
  84                         ) );
  85                 }
  86                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  87
  88                 if ( !is_null( $params['images'] ) ) {
  89                         $images = array();
  90                         foreach ( $params['images'] as $img ) {
  91                                 $title = Title::newFromText( $img );
  92                                 if ( !$title || $title->getNamespace() != NS_FILE ) {
  93                                         $this->setWarning( "\"$img\" is not a file" );
  94                                 } else {
  95                                         $images[] = $title->getDBkey();
  96                                 }
  97                         }
  98                         $this->addWhereFld( 'il_to', $images );
  99                 }
 100
 101                 $res = $this->select( __METHOD__ );
 102
 103                 if ( is_null( $resultPageSet ) ) {
 104                         $count = 0;
 105                         foreach ( $res as $row ) {
 106                                 if ( ++$count > $params['limit'] ) {
 107                                         // We've reached the one extra which shows that
 108                                         // there are additional pages to be had. Stop here...
 109                                         $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
 110                                         break;
 111                                 }
 112                                 $vals = array();
 113                                 ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( NS_FILE, $row->il_to ) );
 114                                 $fit = $this->addPageSubItem( $row->il_from, $vals );
 115                                 if ( !$fit ) {
 116                                         $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
 117                                         break;
 118                                 }
 119                         }
 120                 } else {
 121                         $titles = array();
 122                         $count = 0;
 123                         foreach ( $res as $row ) {
 124                                 if ( ++$count > $params['limit'] ) {
 125                                         // We've reached the one extra which shows that
 126                                         // there are additional pages to be had. Stop here...
 127                                         $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
 128                                         break;
 129                                 }
 130                                 $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
 131                         }
 132                         $resultPageSet->populateFromTitles( $titles );
 133                 }
 134         }
 135
 136         public function getCacheMode( $params ) {
 137                 return 'public';
 138         }
 139
 140         public function getAllowedParams() {
 141                 return array(
 142                         'limit' => array(
 143                                 ApiBase::PARAM_DFLT => 10,
 144                                 ApiBase::PARAM_TYPE => 'limit',
 145                                 ApiBase::PARAM_MIN => 1,
 146                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 147                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 148                         ),
 149                         'continue' => null,
 150                         'images' => array(
 151                                 ApiBase::PARAM_ISMULTI => true,
 152                         ),
 153                         'dir' => array(
 154                                 ApiBase::PARAM_DFLT => 'ascending',
 155                                 ApiBase::PARAM_TYPE => array(
 156                                         'ascending',
 157                                         'descending'
 158                                 )
 159                         ),
 160                 );
 161         }
 162
 163         public function getParamDescription() {
 164                 return array(
 165                         'limit' => 'How many images to return',
 166                         'continue' => 'When more results are available, use this to continue',
 167                         'images' => 'Only list these images. Useful for checking whether a ' .
 168                                 'certain page has a certain Image.',
 169                         'dir' => 'The direction in which to list',
 170                 );
 171         }
 172
 173         public function getDescription() {
 174                 return 'Returns all images contained on the given page(s).';
 175         }
 176
 177         public function getExamples() {
 178                 return array(
 179                         'api.php?action=query&prop=images&titles=Main%20Page'
 180                                 => 'Get a list of images used in the [[Main Page]]',
 181                         'api.php?action=query&generator=images&titles=Main%20Page&prop=info'
 182                                 => 'Get information about all images used in the [[Main Page]]',
 183                 );
 184         }
 185
 186         public function getHelpUrls() {
 187                 return 'https://www.mediawiki.org/wiki/API:Properties#images_.2F_im';
 188         }
 189 }