includes/revisiondelete/RevDelRevisionList.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @ingroup RevisionDelete
  20  */
  21
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Storage\RevisionRecord;
  24 use Wikimedia\Rdbms\FakeResultWrapper;
  25 use Wikimedia\Rdbms\IDatabase;
  26
  27 /**
  28  * List for revision table items
  29  *
  30  * This will check both the 'revision' table for live revisions and the
  31  * 'archive' table for traditionally-deleted revisions that have an
  32  * ar_rev_id saved.
  33  *
  34  * See RevDelRevisionItem and RevDelArchivedRevisionItem for items.
  35  */
  36 class RevDelRevisionList extends RevDelList {
  37         /** @var int */
  38         public $currentRevId;
  39
  40         public function getType() {
  41                 return 'revision';
  42         }
  43
  44         public static function getRelationType() {
  45                 return 'rev_id';
  46         }
  47
  48         public static function getRestriction() {
  49                 return 'deleterevision';
  50         }
  51
  52         public static function getRevdelConstant() {
  53                 return RevisionRecord::DELETED_TEXT;
  54         }
  55
  56         public static function suggestTarget( $target, array $ids ) {
  57                 $rev = Revision::newFromId( $ids[0] );
  58                 return $rev ? $rev->getTitle() : $target;
  59         }
  60
  61         /**
  62          * @param IDatabase $db
  63          * @return mixed
  64          */
  65         public function doQuery( $db ) {
  66                 $ids = array_map( 'intval', $this->ids );
  67                 $revQuery = Revision::getQueryInfo( [ 'page', 'user' ] );
  68                 $queryInfo = [
  69                         'tables' => $revQuery['tables'],
  70                         'fields' => $revQuery['fields'],
  71                         'conds' => [
  72                                 'rev_page' => $this->title->getArticleID(),
  73                                 'rev_id' => $ids,
  74                         ],
  75                         'options' => [
  76                                 'ORDER BY' => 'rev_id DESC',
  77                                 'USE INDEX' => [ 'revision' => 'PRIMARY' ] // workaround for MySQL bug (T104313)
  78                         ],
  79                         'join_conds' => $revQuery['joins'],
  80                 ];
  81                 ChangeTags::modifyDisplayQuery(
  82                         $queryInfo['tables'],
  83                         $queryInfo['fields'],
  84                         $queryInfo['conds'],
  85                         $queryInfo['join_conds'],
  86                         $queryInfo['options'],
  87                         ''
  88                 );
  89
  90                 $live = $db->select(
  91                         $queryInfo['tables'],
  92                         $queryInfo['fields'],
  93                         $queryInfo['conds'],
  94                         __METHOD__,
  95                         $queryInfo['options'],
  96                         $queryInfo['join_conds']
  97                 );
  98                 if ( $live->numRows() >= count( $ids ) ) {
  99                         // All requested revisions are live, keeps things simple!
 100                         return $live;
 101                 }
 102
 103                 $arQuery = Revision::getArchiveQueryInfo();
 104                 $archiveQueryInfo = [
 105                         'tables' => $arQuery['tables'],
 106                         'fields' => $arQuery['fields'],
 107                         'conds' => [
 108                                 'ar_rev_id' => $ids,
 109                         ],
 110                         'options' => [ 'ORDER BY' => 'ar_rev_id DESC' ],
 111                         'join_conds' => $arQuery['joins'],
 112                 ];
 113
 114                 ChangeTags::modifyDisplayQuery(
 115                         $archiveQueryInfo['tables'],
 116                         $archiveQueryInfo['fields'],
 117                         $archiveQueryInfo['conds'],
 118                         $archiveQueryInfo['join_conds'],
 119                         $archiveQueryInfo['options'],
 120                         ''
 121                 );
 122
 123                 // Check if any requested revisions are available fully deleted.
 124                 $archived = $db->select(
 125                         $archiveQueryInfo['tables'],
 126                         $archiveQueryInfo['fields'],
 127                         $archiveQueryInfo['conds'],
 128                         __METHOD__,
 129                         $archiveQueryInfo['options'],
 130                         $archiveQueryInfo['join_conds']
 131                 );
 132
 133                 if ( $archived->numRows() == 0 ) {
 134                         return $live;
 135                 } elseif ( $live->numRows() == 0 ) {
 136                         return $archived;
 137                 } else {
 138                         // Combine the two! Whee
 139                         $rows = [];
 140                         foreach ( $live as $row ) {
 141                                 $rows[$row->rev_id] = $row;
 142                         }
 143                         foreach ( $archived as $row ) {
 144                                 $rows[$row->ar_rev_id] = $row;
 145                         }
 146                         krsort( $rows );
 147                         return new FakeResultWrapper( array_values( $rows ) );
 148                 }
 149         }
 150
 151         public function newItem( $row ) {
 152                 if ( isset( $row->rev_id ) ) {
 153                         return new RevDelRevisionItem( $this, $row );
 154                 } elseif ( isset( $row->ar_rev_id ) ) {
 155                         return new RevDelArchivedRevisionItem( $this, $row );
 156                 } else {
 157                         // This shouldn't happen. :)
 158                         throw new MWException( 'Invalid row type in RevDelRevisionList' );
 159                 }
 160         }
 161
 162         public function getCurrent() {
 163                 if ( is_null( $this->currentRevId ) ) {
 164                         $dbw = wfGetDB( DB_MASTER );
 165                         $this->currentRevId = $dbw->selectField(
 166                                 'page', 'page_latest', $this->title->pageCond(), __METHOD__ );
 167                 }
 168                 return $this->currentRevId;
 169         }
 170
 171         public function getSuppressBit() {
 172                 return RevisionRecord::DELETED_RESTRICTED;
 173         }
 174
 175         public function doPreCommitUpdates() {
 176                 $this->title->invalidateCache();
 177                 return Status::newGood();
 178         }
 179
 180         public function doPostCommitUpdates( array $visibilityChangeMap ) {
 181                 MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $this->title );
 182                 // Extensions that require referencing previous revisions may need this
 183                 Hooks::run( 'ArticleRevisionVisibilitySet',
 184                         [ $this->title, $this->ids, $visibilityChangeMap ] );
 185                 return Status::newGood();
 186         }
 187 }