includes/api/ApiQueryDeletedRevisions.php

   1 <?php
   2 /**
   3  * Copyright © 2014 Wikimedia Foundation and contributors
   4  *
   5  * Heavily based on ApiQueryDeletedrevs,
   6  * Copyright © 2007 Roan Kattouw "<Firstname>.<Lastname>@gmail.com"
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 use MediaWiki\MediaWikiServices;
  27 use MediaWiki\Revision\RevisionRecord;
  28 use MediaWiki\Storage\NameTableAccessException;
  29
  30 /**
  31  * Query module to enumerate deleted revisions for pages.
  32  *
  33  * @ingroup API
  34  */
  35 class ApiQueryDeletedRevisions extends ApiQueryRevisionsBase {
  36
  37         public function __construct( ApiQuery $query, $moduleName ) {
  38                 parent::__construct( $query, $moduleName, 'drv' );
  39         }
  40
  41         protected function run( ApiPageSet $resultPageSet = null ) {
  42                 $user = $this->getUser();
  43                 // Before doing anything at all, let's check permissions
  44                 $this->checkUserRightsAny( 'deletedhistory' );
  45
  46                 $pageSet = $this->getPageSet();
  47                 $pageMap = $pageSet->getGoodAndMissingTitlesByNamespace();
  48                 $pageCount = count( $pageSet->getGoodAndMissingTitles() );
  49                 $revCount = $pageSet->getRevisionCount();
  50                 if ( $revCount === 0 && $pageCount === 0 ) {
  51                         // Nothing to do
  52                         return;
  53                 }
  54                 if ( $revCount !== 0 && count( $pageSet->getDeletedRevisionIDs() ) === 0 ) {
  55                         // Nothing to do, revisions were supplied but none are deleted
  56                         return;
  57                 }
  58
  59                 $params = $this->extractRequestParams( false );
  60
  61                 $db = $this->getDB();
  62                 $revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
  63
  64                 $this->requireMaxOneParameter( $params, 'user', 'excludeuser' );
  65
  66                 if ( $resultPageSet === null ) {
  67                         $this->parseParameters( $params );
  68                         $arQuery = $revisionStore->getArchiveQueryInfo();
  69                         $this->addTables( $arQuery['tables'] );
  70                         $this->addFields( $arQuery['fields'] );
  71                         $this->addJoinConds( $arQuery['joins'] );
  72                         $this->addFields( [ 'ar_title', 'ar_namespace' ] );
  73                 } else {
  74                         $this->limit = $this->getParameter( 'limit' ) ?: 10;
  75                         $this->addTables( 'archive' );
  76                         $this->addFields( [ 'ar_title', 'ar_namespace', 'ar_timestamp', 'ar_rev_id', 'ar_id' ] );
  77                 }
  78
  79                 if ( $this->fld_tags ) {
  80                         $this->addTables( 'tag_summary' );
  81                         $this->addJoinConds(
  82                                 [ 'tag_summary' => [ 'LEFT JOIN', [ 'ar_rev_id=ts_rev_id' ] ] ]
  83                         );
  84                         $this->addFields( 'ts_tags' );
  85                 }
  86
  87                 if ( !is_null( $params['tag'] ) ) {
  88                         $this->addTables( 'change_tag' );
  89                         $this->addJoinConds(
  90                                 [ 'change_tag' => [ 'INNER JOIN', [ 'ar_rev_id=ct_rev_id' ] ] ]
  91                         );
  92                         $changeTagDefStore = MediaWikiServices::getInstance()->getChangeTagDefStore();
  93                         try {
  94                                 $this->addWhereFld( 'ct_tag_id', $changeTagDefStore->getId( $params['tag'] ) );
  95                         } catch ( NameTableAccessException $exception ) {
  96                                 // Return nothing.
  97                                 $this->addWhere( '1=0' );
  98                         }
  99                 }
 100
 101                 if ( $this->fetchContent ) {
 102                         $this->addTables( 'text' );
 103                         $this->addJoinConds(
 104                                 [ 'text' => [ 'LEFT JOIN', [ 'ar_text_id=old_id' ] ] ]
 105                         );
 106                         $this->addFields( [ 'old_text', 'old_flags' ] );
 107
 108                         // This also means stricter restrictions
 109                         $this->checkUserRightsAny( [ 'deletedtext', 'undelete' ] );
 110                 }
 111
 112                 $dir = $params['dir'];
 113
 114                 if ( $revCount !== 0 ) {
 115                         $this->addWhere( [
 116                                 'ar_rev_id' => array_keys( $pageSet->getDeletedRevisionIDs() )
 117                         ] );
 118                 } else {
 119                         // We need a custom WHERE clause that matches all titles.
 120                         $lb = new LinkBatch( $pageSet->getGoodAndMissingTitles() );
 121                         $where = $lb->constructSet( 'ar', $db );
 122                         $this->addWhere( $where );
 123                 }
 124
 125                 if ( !is_null( $params['user'] ) ) {
 126                         // Don't query by user ID here, it might be able to use the ar_usertext_timestamp index.
 127                         $actorQuery = ActorMigration::newMigration()
 128                                 ->getWhere( $db, 'ar_user', User::newFromName( $params['user'], false ), false );
 129                         $this->addTables( $actorQuery['tables'] );
 130                         $this->addJoinConds( $actorQuery['joins'] );
 131                         $this->addWhere( $actorQuery['conds'] );
 132                 } elseif ( !is_null( $params['excludeuser'] ) ) {
 133                         // Here there's no chance of using ar_usertext_timestamp.
 134                         $actorQuery = ActorMigration::newMigration()
 135                                 ->getWhere( $db, 'ar_user', User::newFromName( $params['excludeuser'], false ) );
 136                         $this->addTables( $actorQuery['tables'] );
 137                         $this->addJoinConds( $actorQuery['joins'] );
 138                         $this->addWhere( 'NOT(' . $actorQuery['conds'] . ')' );
 139                 }
 140
 141                 if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 142                         // Paranoia: avoid brute force searches (T19342)
 143                         // (shouldn't be able to get here without 'deletedhistory', but
 144                         // check it again just in case)
 145                         if ( !$user->isAllowed( 'deletedhistory' ) ) {
 146                                 $bitmask = RevisionRecord::DELETED_USER;
 147                         } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 148                                 $bitmask = RevisionRecord::DELETED_USER | RevisionRecord::DELETED_RESTRICTED;
 149                         } else {
 150                                 $bitmask = 0;
 151                         }
 152                         if ( $bitmask ) {
 153                                 $this->addWhere( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
 154                         }
 155                 }
 156
 157                 if ( !is_null( $params['continue'] ) ) {
 158                         $cont = explode( '|', $params['continue'] );
 159                         $op = ( $dir == 'newer' ? '>' : '<' );
 160                         if ( $revCount !== 0 ) {
 161                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 162                                 $rev = intval( $cont[0] );
 163                                 $this->dieContinueUsageIf( strval( $rev ) !== $cont[0] );
 164                                 $ar_id = (int)$cont[1];
 165                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
 166                                 $this->addWhere( "ar_rev_id $op $rev OR " .
 167                                         "(ar_rev_id = $rev AND " .
 168                                         "ar_id $op= $ar_id)" );
 169                         } else {
 170                                 $this->dieContinueUsageIf( count( $cont ) != 4 );
 171                                 $ns = intval( $cont[0] );
 172                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 173                                 $title = $db->addQuotes( $cont[1] );
 174                                 $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
 175                                 $ar_id = (int)$cont[3];
 176                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
 177                                 $this->addWhere( "ar_namespace $op $ns OR " .
 178                                         "(ar_namespace = $ns AND " .
 179                                         "(ar_title $op $title OR " .
 180                                         "(ar_title = $title AND " .
 181                                         "(ar_timestamp $op $ts OR " .
 182                                         "(ar_timestamp = $ts AND " .
 183                                         "ar_id $op= $ar_id)))))" );
 184                         }
 185                 }
 186
 187                 $this->addOption( 'LIMIT', $this->limit + 1 );
 188
 189                 if ( $revCount !== 0 ) {
 190                         // Sort by ar_rev_id when querying by ar_rev_id
 191                         $this->addWhereRange( 'ar_rev_id', $dir, null, null );
 192                 } else {
 193                         // Sort by ns and title in the same order as timestamp for efficiency
 194                         // But only when not already unique in the query
 195                         if ( count( $pageMap ) > 1 ) {
 196                                 $this->addWhereRange( 'ar_namespace', $dir, null, null );
 197                         }
 198                         $oneTitle = key( reset( $pageMap ) );
 199                         foreach ( $pageMap as $pages ) {
 200                                 if ( count( $pages ) > 1 || key( $pages ) !== $oneTitle ) {
 201                                         $this->addWhereRange( 'ar_title', $dir, null, null );
 202                                         break;
 203                                 }
 204                         }
 205                         $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
 206                 }
 207                 // Include in ORDER BY for uniqueness
 208                 $this->addWhereRange( 'ar_id', $dir, null, null );
 209
 210                 $res = $this->select( __METHOD__ );
 211                 $count = 0;
 212                 $generated = [];
 213                 foreach ( $res as $row ) {
 214                         if ( ++$count > $this->limit ) {
 215                                 // We've had enough
 216                                 $this->setContinueEnumParameter( 'continue',
 217                                         $revCount
 218                                                 ? "$row->ar_rev_id|$row->ar_id"
 219                                                 : "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 220                                 );
 221                                 break;
 222                         }
 223
 224                         if ( $resultPageSet !== null ) {
 225                                 $generated[] = $row->ar_rev_id;
 226                         } else {
 227                                 if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 228                                         // Was it converted?
 229                                         $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 230                                         $converted = $pageSet->getConvertedTitles();
 231                                         if ( $title && isset( $converted[$title->getPrefixedText()] ) ) {
 232                                                 $title = Title::newFromText( $converted[$title->getPrefixedText()] );
 233                                                 if ( $title && isset( $pageMap[$title->getNamespace()][$title->getDBkey()] ) ) {
 234                                                         $pageMap[$row->ar_namespace][$row->ar_title] =
 235                                                                 $pageMap[$title->getNamespace()][$title->getDBkey()];
 236                                                 }
 237                                         }
 238                                 }
 239                                 if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 240                                         ApiBase::dieDebug(
 241                                                 __METHOD__,
 242                                                 "Found row in archive (ar_id={$row->ar_id}) that didn't get processed by ApiPageSet"
 243                                         );
 244                                 }
 245
 246                                 $fit = $this->addPageSubItem(
 247                                         $pageMap[$row->ar_namespace][$row->ar_title],
 248                                         $this->extractRevisionInfo( $revisionStore->newRevisionFromArchiveRow( $row ), $row ),
 249                                         'rev'
 250                                 );
 251                                 if ( !$fit ) {
 252                                         $this->setContinueEnumParameter( 'continue',
 253                                                 $revCount
 254                                                         ? "$row->ar_rev_id|$row->ar_id"
 255                                                         : "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 256                                         );
 257                                         break;
 258                                 }
 259                         }
 260                 }
 261
 262                 if ( $resultPageSet !== null ) {
 263                         $resultPageSet->populateFromRevisionIDs( $generated );
 264                 }
 265         }
 266
 267         public function getAllowedParams() {
 268                 return parent::getAllowedParams() + [
 269                         'start' => [
 270                                 ApiBase::PARAM_TYPE => 'timestamp',
 271                         ],
 272                         'end' => [
 273                                 ApiBase::PARAM_TYPE => 'timestamp',
 274                         ],
 275                         'dir' => [
 276                                 ApiBase::PARAM_TYPE => [
 277                                         'newer',
 278                                         'older'
 279                                 ],
 280                                 ApiBase::PARAM_DFLT => 'older',
 281                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 282                         ],
 283                         'tag' => null,
 284                         'user' => [
 285                                 ApiBase::PARAM_TYPE => 'user'
 286                         ],
 287                         'excludeuser' => [
 288                                 ApiBase::PARAM_TYPE => 'user'
 289                         ],
 290                         'continue' => [
 291                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 292                         ],
 293                 ];
 294         }
 295
 296         protected function getExamplesMessages() {
 297                 return [
 298                         'action=query&prop=deletedrevisions&titles=Main%20Page|Talk:Main%20Page&' .
 299                                 'drvslots=*&drvprop=user|comment|content'
 300                                 => 'apihelp-query+deletedrevisions-example-titles',
 301                         'action=query&prop=deletedrevisions&revids=123456'
 302                                 => 'apihelp-query+deletedrevisions-example-revids',
 303                 ];
 304         }
 305
 306         public function getHelpUrls() {
 307                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Deletedrevisions';
 308         }
 309 }