includes/api/ApiQueryAllimages.php

   1 <?php
   2
   3 /**
   4  * API for MediaWiki 1.12+
   5  *
   6  * Created on Mar 16, 2008
   7  *
   8  * Copyright © 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  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  24  * http://www.gnu.org/copyleft/gpl.html
  25  *
  26  * @file
  27  */
  28
  29 if ( !defined( 'MEDIAWIKI' ) ) {
  30         // Eclipse helper - will be ignored in production
  31         require_once( 'ApiQueryBase.php' );
  32 }
  33
  34 /**
  35  * Query module to enumerate all available pages.
  36  *
  37  * @ingroup API
  38  */
  39 class ApiQueryAllimages extends ApiQueryGeneratorBase {
  40
  41         protected $mRepo;
  42
  43         public function __construct( $query, $moduleName ) {
  44                 parent::__construct( $query, $moduleName, 'ai' );
  45                 $this->mRepo = RepoGroup::singleton()->getLocalRepo();
  46         }
  47
  48         /**
  49          * Override parent method to make sure to make sure the repo's DB is used
  50          * which may not necesarilly be the same as the local DB.
  51          *
  52          * TODO: allow querying non-local repos.
  53          * @return DatabaseBase
  54          */
  55         protected function getDB() {
  56                 return $this->mRepo->getSlaveDB();
  57         }
  58
  59         public function execute() {
  60                 $this->run();
  61         }
  62
  63         public function getCacheMode( $params ) {
  64                 return 'public';
  65         }
  66
  67         /**
  68          * @param $resultPageSet ApiPageSet
  69          * @return void
  70          */
  71         public function executeGenerator( $resultPageSet ) {
  72                 if ( $resultPageSet->isResolvingRedirects() ) {
  73                         $this->dieUsage( 'Use "gaifilterredir=nonredirects" option instead of "redirects" when using allimages as a generator', 'params' );
  74                 }
  75
  76                 $this->run( $resultPageSet );
  77         }
  78
  79         /**
  80          * @param $resultPageSet ApiPageSet
  81          * @return void
  82          */
  83         private function run( $resultPageSet = null ) {
  84                 $repo = $this->mRepo;
  85                 if ( !$repo instanceof LocalRepo ) {
  86                         $this->dieUsage( 'Local file repository does not support querying all images', 'unsupportedrepo' );
  87                 }
  88
  89                 $db = $this->getDB();
  90
  91                 $params = $this->extractRequestParams();
  92
  93                 // Image filters
  94                 $dir = ( $params['dir'] == 'descending' ? 'older' : 'newer' );
  95                 $from = ( is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
  96                 $to = ( is_null( $params['to'] ) ? null : $this->titlePartToKey( $params['to'] ) );
  97                 $this->addWhereRange( 'img_name', $dir, $from, $to );
  98
  99                 if ( isset( $params['prefix'] ) )
 100                         $this->addWhere( 'img_name' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
 101
 102                 if ( isset( $params['minsize'] ) ) {
 103                         $this->addWhere( 'img_size>=' . intval( $params['minsize'] ) );
 104                 }
 105
 106                 if ( isset( $params['maxsize'] ) ) {
 107                         $this->addWhere( 'img_size<=' . intval( $params['maxsize'] ) );
 108                 }
 109
 110                 $sha1 = false;
 111                 if ( isset( $params['sha1'] ) ) {
 112                         if ( !self::validateSha1Hash( $params['sha1'] ) ) {
 113                                 $this->dieUsage( 'The SHA1 hash provided is not valid', 'invalidsha1hash' );
 114                         }
 115                         $sha1 = wfBaseConvert( $params['sha1'], 16, 36, 31 );
 116                 } elseif ( isset( $params['sha1base36'] ) ) {
 117                         $sha1 = $params['sha1base36'];
 118                         if ( !self::validateSha1Base36Hash( $sha1 ) ) {
 119                                 $this->dieUsage( 'The SHA1Base36 hash provided is not valid', 'invalidsha1base36hash' );
 120                         }
 121                 }
 122                 if ( $sha1 ) {
 123                         $this->addWhereFld( 'img_sha1', $sha1 );
 124                 }
 125
 126                 if ( !is_null( $params['mime'] ) ) {
 127                         global $wgMiserMode;
 128                         if ( $wgMiserMode  ) {
 129                                 $this->dieUsage( 'MIME search disabled in Miser Mode', 'mimeearchdisabled' );
 130                         }
 131
 132                         list( $major, $minor ) = File::splitMime( $params['mime'] );
 133
 134                         $this->addWhereFld( 'img_major_mime', $major );
 135                         $this->addWhereFld( 'img_minor_mime', $minor );
 136                 }
 137
 138                 $this->addTables( 'image' );
 139
 140                 $prop = array_flip( $params['prop'] );
 141                 $this->addFields( LocalFile::selectFields() );
 142
 143                 $limit = $params['limit'];
 144                 $this->addOption( 'LIMIT', $limit + 1 );
 145                 $this->addOption( 'ORDER BY', 'img_name' .
 146                                                 ( $params['dir'] == 'descending' ? ' DESC' : '' ) );
 147
 148                 $res = $this->select( __METHOD__ );
 149
 150                 $titles = array();
 151                 $count = 0;
 152                 $result = $this->getResult();
 153                 foreach ( $res as $row ) {
 154                         if ( ++ $count > $limit ) {
 155                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 156                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
 157                                 $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->img_name ) );
 158                                 break;
 159                         }
 160
 161                         if ( is_null( $resultPageSet ) ) {
 162                                 $file = $repo->newFileFromRow( $row );
 163                                 $info = array_merge( array( 'name' => $row->img_name ),
 164                                         ApiQueryImageInfo::getInfo( $file, $prop, $result ) );
 165                                 self::addTitleInfo( $info, $file->getTitle() );
 166
 167                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $info );
 168                                 if ( !$fit ) {
 169                                         $this->setContinueEnumParameter( 'from', $this->keyToTitle( $row->img_name ) );
 170                                         break;
 171                                 }
 172                         } else {
 173                                 $titles[] = Title::makeTitle( NS_IMAGE, $row->img_name );
 174                         }
 175                 }
 176
 177                 if ( is_null( $resultPageSet ) ) {
 178                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'img' );
 179                 } else {
 180                         $resultPageSet->populateFromTitles( $titles );
 181                 }
 182         }
 183
 184         /**
 185          * @param $hash string
 186          * @return bool
 187          */
 188         public static function validateSha1Hash( $hash ) {
 189                 return preg_match( '/[a-f0-9]{40}/', $hash );
 190         }
 191
 192         /**
 193          * @param $hash string
 194          * @return bool
 195          */
 196         public static function validateSha1Base36Hash( $hash ) {
 197                 return preg_match( '/[a-z0-9]{31}/', $hash );
 198         }
 199
 200         public function getAllowedParams() {
 201                 return array (
 202                         'from' => null,
 203                         'to' => null,
 204                         'prefix' => null,
 205                         'minsize' => array(
 206                                 ApiBase::PARAM_TYPE => 'integer',
 207                         ),
 208                         'maxsize' => array(
 209                                 ApiBase::PARAM_TYPE => 'integer',
 210                         ),
 211                         'limit' => array(
 212                                 ApiBase::PARAM_DFLT => 10,
 213                                 ApiBase::PARAM_TYPE => 'limit',
 214                                 ApiBase::PARAM_MIN => 1,
 215                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 216                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 217                         ),
 218                         'dir' => array(
 219                                 ApiBase::PARAM_DFLT => 'ascending',
 220                                 ApiBase::PARAM_TYPE => array(
 221                                         'ascending',
 222                                         'descending'
 223                                 )
 224                         ),
 225                         'sha1' => null,
 226                         'sha1base36' => null,
 227                         'prop' => array(
 228                                 ApiBase::PARAM_TYPE => ApiQueryImageInfo::getPropertyNames( $this->propertyFilter ),
 229                                 ApiBase::PARAM_DFLT => 'timestamp|url',
 230                                 ApiBase::PARAM_ISMULTI => true
 231                         ),
 232                         'mime' => null,
 233                 );
 234         }
 235
 236         public function getParamDescription() {
 237                 return array(
 238                         'from' => 'The image title to start enumerating from',
 239                         'to' => 'The image title to stop enumerating at',
 240                         'prefix' => 'Search for all image titles that begin with this value',
 241                         'dir' => 'The direction in which to list',
 242                         'minsize' => 'Limit to images with at least this many bytes',
 243                         'maxsize' => 'Limit to images with at most this many bytes',
 244                         'limit' => 'How many images in total to return',
 245                         'sha1' => "SHA1 hash of image. Overrides {$this->getModulePrefix()}sha1base36",
 246                         'sha1base36' => 'SHA1 hash of image in base 36 (used in MediaWiki)',
 247                         'prop' => ApiQueryImageInfo::getPropertyDescriptions( $this->propertyFilter ),
 248                         'mime' => 'What MIME type to search for. e.g. image/jpeg. Disabled in Miser Mode',
 249                 );
 250         }
 251
 252         private $propertyFilter = array( 'archivename' );
 253
 254         public function getDescription() {
 255                 return 'Enumerate all images sequentially';
 256         }
 257
 258         public function getPossibleErrors() {
 259                 return array_merge( parent::getPossibleErrors(), array(
 260                         array( 'code' => 'params', 'info' => 'Use "gaifilterredir=nonredirects" option instead of "redirects" when using allimages as a generator' ),
 261                         array( 'code' => 'unsupportedrepo', 'info' => 'Local file repository does not support querying all images' ),
 262                         array( 'code' => 'mimeearchdisabled', 'info' => 'MIME search disabled in Miser Mode' ),
 263                         array( 'code' => 'invalidsha1hash', 'info' => 'The SHA1 hash provided is not valid' ),
 264                         array( 'code' => 'invalidsha1base36hash', 'info' => 'The SHA1Base36 hash provided is not valid' ),
 265                 ) );
 266         }
 267
 268         protected function getExamples() {
 269                 return array(
 270                         'Simple Use',
 271                         ' Show a list of images starting at the letter "B"',
 272                         '  api.php?action=query&list=allimages&aifrom=B',
 273                         'Using as Generator',
 274                         ' Show info about 4 images starting at the letter "T"',
 275                         '  api.php?action=query&generator=allimages&gailimit=4&gaifrom=T&prop=imageinfo',
 276                 );
 277         }
 278
 279         public function getVersion() {
 280                 return __CLASS__ . ': $Id$';
 281         }
 282 }