includes/api/ApiQueryAllimages.php

   1 <?php
   2
   3 /*
   4  * Created on Mar 16, 2008
   5  *
   6  * API for MediaWiki 1.12+
   7  *
   8  * Copyright (C) 2008 Vasiliev Victor vasilvv@gmail.com,
   9  * based on ApiQueryAllpages.php
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  * http://www.gnu.org/copyleft/gpl.html
  25  */
  26
  27 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once ( 'ApiQueryBase.php' );
  30 }
  31
  32 /**
  33  * Query module to enumerate all available pages.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryAllimages extends ApiQueryGeneratorBase {
  38
  39         public function __construct( $query, $moduleName ) {
  40                 parent :: __construct( $query, $moduleName, 'ai' );
  41                 $this->mRepo = RepoGroup::singleton()->getLocalRepo();
  42         }
  43
  44         /**
  45          * Overide parent method to make sure to make sure the repo's DB is used
  46          * which may not necesarilly be the same as the local DB.
  47          *
  48          * TODO: allow querying non-local repos.
  49          */
  50         protected function getDB() {
  51                 return $this->mRepo->getSlaveDB();
  52         }
  53
  54         public function execute() {
  55                 $this->run();
  56         }
  57
  58         public function executeGenerator( $resultPageSet ) {
  59                 if ( $resultPageSet->isResolvingRedirects() )
  60                         $this->dieUsage( 'Use "gaifilterredir=nonredirects" option instead of "redirects" when using allimages as a generator', 'params' );
  61
  62                 $this->run( $resultPageSet );
  63         }
  64
  65         private function run( $resultPageSet = null ) {
  66                 $repo = $this->mRepo;
  67                 if ( !$repo instanceof LocalRepo )
  68                         $this->dieUsage( 'Local file repository does not support querying all images', 'unsupportedrepo' );
  69
  70                 $db = $this->getDB();
  71
  72                 $params = $this->extractRequestParams();
  73
  74                 // Image filters
  75                 $dir = ( $params['dir'] == 'descending' ? 'older' : 'newer' );
  76                 $from = ( is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
  77                 $this->addWhereRange( 'img_name', $dir, $from, null );
  78                 if ( isset ( $params['prefix'] ) )
  79                         $this->addWhere( 'img_name' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
  80
  81                 if ( isset ( $params['minsize'] ) ) {
  82                         $this->addWhere( 'img_size>=' . intval( $params['minsize'] ) );
  83                 }
  84
  85                 if ( isset ( $params['maxsize'] ) ) {
  86                         $this->addWhere( 'img_size<=' . intval( $params['maxsize'] ) );
  87                 }
  88
  89                 $sha1 = false;
  90                 if ( isset( $params['sha1'] ) ) {
  91                         $sha1 = wfBaseConvert( $params['sha1'], 16, 36, 31 );
  92                 } elseif ( isset( $params['sha1base36'] ) ) {
  93                         $sha1 = $params['sha1base36'];
  94                 }
  95                 if ( $sha1 ) {
  96                         $this->addWhere( 'img_sha1=' . $db->addQuotes( $sha1 ) );
  97                 }
  98
  99                 $this->addTables( 'image' );
 100
 101                 $prop = array_flip( $params['prop'] );
 102                 $this->addFields( LocalFile::selectFields() );
 103
 104                 $limit = $params['limit'];
 105                 $this->addOption( 'LIMIT', $limit + 1 );
 106                 $this->addOption( 'ORDER BY', 'img_name' .
 107                                                 ( $params['dir'] == 'descending' ? ' DESC' : '' ) );
 108
 109                 $res = $this->select( __METHOD__ );
 110
 111                 $titles = array();
 112                 $count = 0;
 113                 $result = $this->getResult();
 114                 while ( $row = $db->fetchObject( $res ) ) {
 115                         if ( ++ $count > $limit ) {
 116                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 117                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
 118                                 $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->img_name ) );
 119                                 break;
 120                         }
 121
 122                         if ( is_null( $resultPageSet ) ) {
 123                                 $file = $repo->newFileFromRow( $row );
 124                                 $info = array_merge( array( 'name' => $row->img_name ),
 125                                         ApiQueryImageInfo::getInfo( $file, $prop, $result ) );
 126                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $info );
 127                                 if ( !$fit ) {
 128                                         $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->img_name ) );
 129                                         break;
 130                                 }
 131                         } else {
 132                                 $titles[] = Title::makeTitle( NS_IMAGE, $row->img_name );
 133                         }
 134                 }
 135                 $db->freeResult( $res );
 136
 137                 if ( is_null( $resultPageSet ) ) {
 138                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'img' );
 139                 } else {
 140                         $resultPageSet->populateFromTitles( $titles );
 141                 }
 142         }
 143
 144         public function getAllowedParams() {
 145                 return array (
 146                         'from' => null,
 147                         'prefix' => null,
 148                         'minsize' => array (
 149                                 ApiBase :: PARAM_TYPE => 'integer',
 150                         ),
 151                         'maxsize' => array (
 152                                 ApiBase :: PARAM_TYPE => 'integer',
 153                         ),
 154                         'limit' => array (
 155                                 ApiBase :: PARAM_DFLT => 10,
 156                                 ApiBase :: PARAM_TYPE => 'limit',
 157                                 ApiBase :: PARAM_MIN => 1,
 158                                 ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 159                                 ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 160                         ),
 161                         'dir' => array (
 162                                 ApiBase :: PARAM_DFLT => 'ascending',
 163                                 ApiBase :: PARAM_TYPE => array (
 164                                         'ascending',
 165                                         'descending'
 166                                 )
 167                         ),
 168                         'sha1' => null,
 169                         'sha1base36' => null,
 170                         'prop' => array (
 171                                 ApiBase :: PARAM_TYPE => ApiQueryImageInfo::getPropertyNames(),
 172                                 ApiBase :: PARAM_DFLT => 'timestamp|url',
 173                                 ApiBase :: PARAM_ISMULTI => true
 174                         )
 175                 );
 176         }
 177
 178         public function getParamDescription() {
 179                 return array (
 180                         'from' => 'The image title to start enumerating from.',
 181                         'prefix' => 'Search for all image titles that begin with this value.',
 182                         'dir' => 'The direction in which to list',
 183                         'minsize' => 'Limit to images with at least this many bytes',
 184                         'maxsize' => 'Limit to images with at most this many bytes',
 185                         'limit' => 'How many total images to return.',
 186                         'sha1' => 'SHA1 hash of image',
 187                         'sha1base36' => 'SHA1 hash of image in base 36 (used in MediaWiki)',
 188                         'prop' => 'Which properties to get',
 189                 );
 190         }
 191
 192         public function getDescription() {
 193                 return 'Enumerate all images sequentially';
 194         }
 195
 196         protected function getExamples() {
 197                 return array (
 198                         'Simple Use',
 199                         ' Show a list of images starting at the letter "B"',
 200                         '  api.php?action=query&list=allimages&aifrom=B',
 201                         'Using as Generator',
 202                         ' Show info about 4 images starting at the letter "T"',
 203                         '  api.php?action=query&generator=allimages&gailimit=4&gaifrom=T&prop=imageinfo',
 204                 );
 205         }
 206
 207         public function getVersion() {
 208                 return __CLASS__ . ': $Id$';
 209         }
 210 }