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\Storage\RevisionRecord;
  23 use Wikimedia\Rdbms\FakeResultWrapper;
  24 use Wikimedia\Rdbms\IDatabase;
  25
  26 /**
  27  * List for revision table items
  28  *
  29  * This will check both the 'revision' table for live revisions and the
  30  * 'archive' table for traditionally-deleted revisions that have an
  31  * ar_rev_id saved.
  32  *
  33  * See RevDelRevisionItem and RevDelArchivedRevisionItem for items.
  34  */
  35 class RevDelRevisionList extends RevDelList {
  36         /** @var int */
  37         public $currentRevId;
  38
  39         public function getType() {
  40                 return 'revision';
  41         }
  42
  43         public static function getRelationType() {
  44                 return 'rev_id';
  45         }
  46
  47         public static function getRestriction() {
  48                 return 'deleterevision';
  49         }
  50
  51         public static function getRevdelConstant() {
  52                 return RevisionRecord::DELETED_TEXT;
  53         }
  54
  55         public static function suggestTarget( $target, array $ids ) {
  56                 $rev = Revision::newFromId( $ids[0] );
  57                 return $rev ? $rev->getTitle() : $target;
  58         }
  59
  60         /**
  61          * @param IDatabase $db
  62          * @return mixed
  63          */
  64         public function doQuery( $db ) {
  65                 $ids = array_map( 'intval', $this->ids );
  66                 $revQuery = Revision::getQueryInfo( [ 'page', 'user' ] );
  67                 $queryInfo = [
  68                         'tables' => $revQuery['tables'],
  69                         'fields' => $revQuery['fields'],
  70                         'conds' => [
  71                                 'rev_page' => $this->title->getArticleID(),
  72                                 'rev_id' => $ids,
  73                         ],
  74                         'options' => [
  75                                 'ORDER BY' => 'rev_id DESC',
  76                                 'USE INDEX' => [ 'revision' => 'PRIMARY' ] // workaround for MySQL bug (T104313)
  77                         ],
  78                         'join_conds' => $revQuery['joins'],
  79                 ];
  80                 ChangeTags::modifyDisplayQuery(
  81                         $queryInfo['tables'],
  82                         $queryInfo['fields'],
  83                         $queryInfo['conds'],
  84                         $queryInfo['join_conds'],
  85                         $queryInfo['options'],
  86                         ''
  87                 );
  88
  89                 $live = $db->select(
  90                         $queryInfo['tables'],
  91                         $queryInfo['fields'],
  92                         $queryInfo['conds'],
  93                         __METHOD__,
  94                         $queryInfo['options'],
  95                         $queryInfo['join_conds']
  96                 );
  97                 if ( $live->numRows() >= count( $ids ) ) {
  98                         // All requested revisions are live, keeps things simple!
  99                         return $live;
 100                 }
 101
 102                 $arQuery = Revision::getArchiveQueryInfo();
 103                 $archiveQueryInfo = [
 104                         'tables' => $arQuery['tables'],
 105                         'fields' => $arQuery['fields'],
 106                         'conds' => [
 107                                 'ar_rev_id' => $ids,
 108                         ],
 109                         'options' => [ 'ORDER BY' => 'ar_rev_id DESC' ],
 110                         'join_conds' => $arQuery['joins'],
 111                 ];
 112
 113                 ChangeTags::modifyDisplayQuery(
 114                         $archiveQueryInfo['tables'],
 115                         $archiveQueryInfo['fields'],
 116                         $archiveQueryInfo['conds'],
 117                         $archiveQueryInfo['join_conds'],
 118                         $archiveQueryInfo['options'],
 119                         ''
 120                 );
 121
 122                 // Check if any requested revisions are available fully deleted.
 123                 $archived = $db->select(
 124                         $archiveQueryInfo['tables'],
 125                         $archiveQueryInfo['fields'],
 126                         $archiveQueryInfo['conds'],
 127                         __METHOD__,
 128                         $archiveQueryInfo['options'],
 129                         $archiveQueryInfo['join_conds']
 130                 );
 131
 132                 if ( $archived->numRows() == 0 ) {
 133                         return $live;
 134                 } elseif ( $live->numRows() == 0 ) {
 135                         return $archived;
 136                 } else {
 137                         // Combine the two! Whee
 138                         $rows = [];
 139                         foreach ( $live as $row ) {
 140                                 $rows[$row->rev_id] = $row;
 141                         }
 142                         foreach ( $archived as $row ) {
 143                                 $rows[$row->ar_rev_id] = $row;
 144                         }
 145                         krsort( $rows );
 146                         return new FakeResultWrapper( array_values( $rows ) );
 147                 }
 148         }
 149
 150         public function newItem( $row ) {
 151                 if ( isset( $row->rev_id ) ) {
 152                         return new RevDelRevisionItem( $this, $row );
 153                 } elseif ( isset( $row->ar_rev_id ) ) {
 154                         return new RevDelArchivedRevisionItem( $this, $row );
 155                 } else {
 156                         // This shouldn't happen. :)
 157                         throw new MWException( 'Invalid row type in RevDelRevisionList' );
 158                 }
 159         }
 160
 161         public function getCurrent() {
 162                 if ( is_null( $this->currentRevId ) ) {
 163                         $dbw = wfGetDB( DB_MASTER );
 164                         $this->currentRevId = $dbw->selectField(
 165                                 'page', 'page_latest', $this->title->pageCond(), __METHOD__ );
 166                 }
 167                 return $this->currentRevId;
 168         }
 169
 170         public function getSuppressBit() {
 171                 return RevisionRecord::DELETED_RESTRICTED;
 172         }
 173
 174         public function doPreCommitUpdates() {
 175                 $this->title->invalidateCache();
 176                 return Status::newGood();
 177         }
 178
 179         public function doPostCommitUpdates( array $visibilityChangeMap ) {
 180                 $this->title->purgeSquid();
 181                 // Extensions that require referencing previous revisions may need this
 182                 Hooks::run( 'ArticleRevisionVisibilitySet', [ $this->title, $this->ids, $visibilityChangeMap ] );
 183                 return Status::newGood();
 184         }
 185 }