includes/api/ApiQueryDuplicateFiles.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 27, 2008
   6  *
   7  * Copyright © 2008 Roan Kattouw <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  * A query module to list duplicates of the given file(s)
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryDuplicateFiles extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'df' );
  36         }
  37
  38         public function execute() {
  39                 $this->run();
  40         }
  41
  42         public function getCacheMode( $params ) {
  43                 return 'public';
  44         }
  45
  46         public function executeGenerator( $resultPageSet ) {
  47                 $this->run( $resultPageSet );
  48         }
  49
  50         /**
  51          * @param $resultPageSet ApiPageSet
  52          * @return
  53          */
  54         private function run( $resultPageSet = null ) {
  55                 $params = $this->extractRequestParams();
  56                 $namespaces = $this->getPageSet()->getAllTitlesByNamespace();
  57                 if ( empty( $namespaces[NS_FILE] ) ) {
  58                         return;
  59                 }
  60                 $images = $namespaces[NS_FILE];
  61
  62                 $this->addTables( 'image', 'i1' );
  63                 $this->addTables( 'image', 'i2' );
  64                 $this->addFields( array(
  65                         'i1.img_name AS orig_name',
  66                         'i2.img_name AS dup_name',
  67                         'i2.img_user_text AS dup_user_text',
  68                         'i2.img_timestamp AS dup_timestamp'
  69                 ) );
  70
  71                 $this->addWhere( array(
  72                         'i1.img_name' => array_keys( $images ),
  73                         'i1.img_sha1 = i2.img_sha1',
  74                         'i1.img_name != i2.img_name',
  75                 ) );
  76
  77                 if ( isset( $params['continue'] ) ) {
  78                         $cont = explode( '|', $params['continue'] );
  79                         if ( count( $cont ) != 2 ) {
  80                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  81                                         'original value returned by the previous query', '_badcontinue' );
  82                         }
  83                         $op = $params['dir'] == 'descending' ? '<' : '>';
  84                         $db = $this->getDB();
  85                         $orig = $db->addQuotes( $this->titleTokey( $cont[0] ) );
  86                         $dup = $db->addQuotes( $this->titleToKey( $cont[1] ) );
  87                         $this->addWhere(
  88                                 "i1.img_name $op $orig OR " .
  89                                 "(i1.img_name = $orig AND " .
  90                                 "i2.img_name $op= $dup)"
  91                         );
  92                 }
  93
  94                 $dir = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  95                 // Don't order by i1.img_name if it's constant in the WHERE clause
  96                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  97                         $this->addOption( 'ORDER BY', 'i2.img_name' . $dir );
  98                 } else {
  99                         $this->addOption( 'ORDER BY', array(
 100                                         'i1.img_name' . $dir,
 101                                         'i2.img_name' . $dir
 102                         ));
 103                 }
 104                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
 105
 106                 $res = $this->select( __METHOD__ );
 107                 $count = 0;
 108                 $titles = array();
 109                 foreach ( $res as $row ) {
 110                         if ( ++$count > $params['limit'] ) {
 111                                 // We've reached the one extra which shows that
 112                                 // there are additional pages to be had. Stop here...
 113                                 $this->setContinueEnumParameter( 'continue',
 114                                         $this->keyToTitle( $row->orig_name ) . '|' .
 115                                         $this->keyToTitle( $row->dup_name ) );
 116                                 break;
 117                         }
 118                         if ( !is_null( $resultPageSet ) ) {
 119                                 $titles[] = Title::makeTitle( NS_FILE, $row->dup_name );
 120                         } else {
 121                                 $r = array(
 122                                         'name' => $row->dup_name,
 123                                         'user' => $row->dup_user_text,
 124                                         'timestamp' => wfTimestamp( TS_ISO_8601, $row->dup_timestamp )
 125                                 );
 126                                 $fit = $this->addPageSubItem( $images[$row->orig_name], $r );
 127                                 if ( !$fit ) {
 128                                         $this->setContinueEnumParameter( 'continue',
 129                                                         $this->keyToTitle( $row->orig_name ) . '|' .
 130                                                         $this->keyToTitle( $row->dup_name ) );
 131                                         break;
 132                                 }
 133                         }
 134                 }
 135                 if ( !is_null( $resultPageSet ) ) {
 136                         $resultPageSet->populateFromTitles( $titles );
 137                 }
 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                         'dir' => array(
 151                                 ApiBase::PARAM_DFLT => 'ascending',
 152                                 ApiBase::PARAM_TYPE => array(
 153                                         'ascending',
 154                                         'descending'
 155                                 )
 156                         ),
 157                 );
 158         }
 159
 160         public function getParamDescription() {
 161                 return array(
 162                         'limit' => 'How many files to return',
 163                         'continue' => 'When more results are available, use this to continue',
 164                         'dir' => 'The direction in which to list',
 165                 );
 166         }
 167
 168         public function getDescription() {
 169                 return 'List all files that are duplicates of the given file(s)';
 170         }
 171
 172         public function getPossibleErrors() {
 173                 return array_merge( parent::getPossibleErrors(), array(
 174                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 175                 ) );
 176         }
 177
 178         public function getExamples() {
 179                 return array(
 180                         'api.php?action=query&titles=File:Albert_Einstein_Head.jpg&prop=duplicatefiles',
 181                         'api.php?action=query&generator=allimages&prop=duplicatefiles',
 182                 );
 183         }
 184
 185         public function getHelpUrls() {
 186                 return 'https://www.mediawiki.org/wiki/API:Properties#duplicatefiles_.2F_df';
 187         }
 188
 189         public function getVersion() {
 190                 return __CLASS__ . ': $Id$';
 191         }
 192 }