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( $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 $resultPageSet ApiPageSet
  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                         if ( count( $cont ) != 2 ) {
  66                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  67                                         'original value returned by the previous query', '_badcontinue' );
  68                         }
  69                         $op = $params['dir'] == 'descending' ? '<' : '>';
  70                         $ilfrom = intval( $cont[0] );
  71                         $ilto = $this->getDB()->addQuotes( $cont[1] );
  72                         $this->addWhere(
  73                                 "il_from $op $ilfrom OR " .
  74                                 "(il_from = $ilfrom AND " .
  75                                 "il_to $op= $ilto)"
  76                         );
  77                 }
  78
  79                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  80                 // Don't order by il_from if it's constant in the WHERE clause
  81                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  82                         $this->addOption( 'ORDER BY', 'il_to' . $sort );
  83                 } else {
  84                         $this->addOption( 'ORDER BY', array(
  85                                                 'il_from' . $sort,
  86                                                 'il_to' . $sort
  87                         ));
  88                 }
  89                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  90
  91                 if ( !is_null( $params['images'] ) ) {
  92                         $images = array();
  93                         foreach ( $params['images'] as $img ) {
  94                                 $title = Title::newFromText( $img );
  95                                 if ( !$title || $title->getNamespace() != NS_FILE ) {
  96                                         $this->setWarning( "\"$img\" is not a file" );
  97                                 } else {
  98                                         $images[] = $title->getDBkey();
  99                                 }
 100                         }
 101                         $this->addWhereFld( 'il_to', $images );
 102                 }
 103
 104                 $res = $this->select( __METHOD__ );
 105
 106                 if ( is_null( $resultPageSet ) ) {
 107                         $count = 0;
 108                         foreach ( $res as $row ) {
 109                                 if ( ++$count > $params['limit'] ) {
 110                                         // We've reached the one extra which shows that
 111                                         // there are additional pages to be had. Stop here...
 112                                         $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $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 . '|' . $row->il_to );
 120                                         break;
 121                                 }
 122                         }
 123                 } else {
 124                         $titles = array();
 125                         $count = 0;
 126                         foreach ( $res as $row ) {
 127                                 if ( ++$count > $params['limit'] ) {
 128                                         // We've reached the one extra which shows that
 129                                         // there are additional pages to be had. Stop here...
 130                                         $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
 131                                         break;
 132                                 }
 133                                 $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
 134                         }
 135                         $resultPageSet->populateFromTitles( $titles );
 136                 }
 137         }
 138
 139         public function getCacheMode( $params ) {
 140                 return 'public';
 141         }
 142
 143         public function getAllowedParams() {
 144                 return array(
 145                         'limit' => array(
 146                                 ApiBase::PARAM_DFLT => 10,
 147                                 ApiBase::PARAM_TYPE => 'limit',
 148                                 ApiBase::PARAM_MIN => 1,
 149                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 150                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 151                         ),
 152                         'continue' => null,
 153                         'images' => array(
 154                                 ApiBase::PARAM_ISMULTI => true,
 155                         ),
 156                         'dir' => array(
 157                                 ApiBase::PARAM_DFLT => 'ascending',
 158                                 ApiBase::PARAM_TYPE => array(
 159                                         'ascending',
 160                                         'descending'
 161                                 )
 162                         ),
 163                 );
 164         }
 165
 166         public function getParamDescription() {
 167                 return array(
 168                         'limit' => 'How many images to return',
 169                         'continue' => 'When more results are available, use this to continue',
 170                         'images' => 'Only list these images. Useful for checking whether a certain page has a certain Image.',
 171                         'dir' => 'The direction in which to list',
 172                 );
 173         }
 174
 175         public function getResultProperties() {
 176                 return array(
 177                         '' => array(
 178                                 'ns' => 'namespace',
 179                                 'title' => 'string'
 180                         )
 181                 );
 182         }
 183
 184         public function getDescription() {
 185                 return 'Returns all images contained on the given page(s)';
 186         }
 187
 188         public function getPossibleErrors() {
 189                 return array_merge( parent::getPossibleErrors(), array(
 190                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 191                 ) );
 192         }
 193
 194         public function getExamples() {
 195                 return array(
 196                         'api.php?action=query&prop=images&titles=Main%20Page' => 'Get a list of images used in the [[Main Page]]',
 197                         'api.php?action=query&generator=images&titles=Main%20Page&prop=info' => 'Get information about all images used in the [[Main Page]]',
 198                 );
 199         }
 200
 201         public function getHelpUrls() {
 202                 return 'https://www.mediawiki.org/wiki/API:Properties#images_.2F_im';
 203         }
 204
 205         public function getVersion() {
 206                 return __CLASS__ . ': $Id$';
 207         }
 208 }