includes/api/ApiQueryImages.php

   1 <?php
   2 /**
   3  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * This query adds an "<images>" subelement to all pages with the list of
  25  * images embedded into those pages.
  26  *
  27  * @ingroup API
  28  */
  29 class ApiQueryImages extends ApiQueryGeneratorBase {
  30
  31         public function __construct( ApiQuery $query, $moduleName ) {
  32                 parent::__construct( $query, $moduleName, 'im' );
  33         }
  34
  35         public function execute() {
  36                 $this->run();
  37         }
  38
  39         public function executeGenerator( $resultPageSet ) {
  40                 $this->run( $resultPageSet );
  41         }
  42
  43         /**
  44          * @param ApiPageSet $resultPageSet
  45          */
  46         private function run( $resultPageSet = null ) {
  47                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  48                         return; // nothing to do
  49                 }
  50
  51                 $params = $this->extractRequestParams();
  52                 $this->addFields( [
  53                         'il_from',
  54                         'il_to'
  55                 ] );
  56
  57                 $this->addTables( 'imagelinks' );
  58                 $this->addWhereFld( 'il_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  59                 if ( !is_null( $params['continue'] ) ) {
  60                         $cont = explode( '|', $params['continue'] );
  61                         $this->dieContinueUsageIf( count( $cont ) != 2 );
  62                         $op = $params['dir'] == 'descending' ? '<' : '>';
  63                         $ilfrom = intval( $cont[0] );
  64                         $ilto = $this->getDB()->addQuotes( $cont[1] );
  65                         $this->addWhere(
  66                                 "il_from $op $ilfrom OR " .
  67                                 "(il_from = $ilfrom AND " .
  68                                 "il_to $op= $ilto)"
  69                         );
  70                 }
  71
  72                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  73                 // Don't order by il_from if it's constant in the WHERE clause
  74                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  75                         $this->addOption( 'ORDER BY', 'il_to' . $sort );
  76                 } else {
  77                         $this->addOption( 'ORDER BY', [
  78                                 'il_from' . $sort,
  79                                 'il_to' . $sort
  80                         ] );
  81                 }
  82                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  83
  84                 if ( $params['images'] ) {
  85                         $images = [];
  86                         foreach ( $params['images'] as $img ) {
  87                                 $title = Title::newFromText( $img );
  88                                 if ( !$title || $title->getNamespace() != NS_FILE ) {
  89                                         $this->addWarning( [ 'apiwarn-notfile', wfEscapeWikiText( $img ) ] );
  90                                 } else {
  91                                         $images[] = $title->getDBkey();
  92                                 }
  93                         }
  94                         if ( !$images ) {
  95                                 // No titles so no results
  96                                 return;
  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 = [];
 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 = [];
 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 [
 142                         'limit' => [
 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' => [
 150                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 151                         ],
 152                         'images' => [
 153                                 ApiBase::PARAM_ISMULTI => true,
 154                         ],
 155                         'dir' => [
 156                                 ApiBase::PARAM_DFLT => 'ascending',
 157                                 ApiBase::PARAM_TYPE => [
 158                                         'ascending',
 159                                         'descending'
 160                                 ]
 161                         ],
 162                 ];
 163         }
 164
 165         protected function getExamplesMessages() {
 166                 return [
 167                         'action=query&prop=images&titles=Main%20Page'
 168                                 => 'apihelp-query+images-example-simple',
 169                         'action=query&generator=images&titles=Main%20Page&prop=info'
 170                                 => 'apihelp-query+images-example-generator',
 171                 ];
 172         }
 173
 174         public function getHelpUrls() {
 175                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Images';
 176         }
 177 }