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 Wikimedia\Rdbms\FakeResultWrapper;
  23 use Wikimedia\Rdbms\IDatabase;
  24
  25 /**
  26  * List for revision table items
  27  *
  28  * This will check both the 'revision' table for live revisions and the
  29  * 'archive' table for traditionally-deleted revisions that have an
  30  * ar_rev_id saved.
  31  *
  32  * See RevDelRevisionItem and RevDelArchivedRevisionItem for items.
  33  */
  34 class RevDelRevisionList extends RevDelList {
  35         /** @var int */
  36         public $currentRevId;
  37
  38         public function getType() {
  39                 return 'revision';
  40         }
  41
  42         public static function getRelationType() {
  43                 return 'rev_id';
  44         }
  45
  46         public static function getRestriction() {
  47                 return 'deleterevision';
  48         }
  49
  50         public static function getRevdelConstant() {
  51                 return Revision::DELETED_TEXT;
  52         }
  53
  54         public static function suggestTarget( $target, array $ids ) {
  55                 $rev = Revision::newFromId( $ids[0] );
  56                 return $rev ? $rev->getTitle() : $target;
  57         }
  58
  59         /**
  60          * @param IDatabase $db
  61          * @return mixed
  62          */
  63         public function doQuery( $db ) {
  64                 $ids = array_map( 'intval', $this->ids );
  65                 $queryInfo = [
  66                         'tables' => [ 'revision', 'page', 'user' ],
  67                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
  68                         'conds' => [
  69                                 'rev_page' => $this->title->getArticleID(),
  70                                 'rev_id' => $ids,
  71                         ],
  72                         'options' => [
  73                                 'ORDER BY' => 'rev_id DESC',
  74                                 'USE INDEX' => [ 'revision' => 'PRIMARY' ] // workaround for MySQL bug (T104313)
  75                         ],
  76                         'join_conds' => [
  77                                 'page' => Revision::pageJoinCond(),
  78                                 'user' => Revision::userJoinCond(),
  79                         ],
  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                 $archiveQueryInfo = [
 104                         'tables' => [ 'archive' ],
 105                         'fields' => Revision::selectArchiveFields(),
 106                         'conds' => [
 107                                 'ar_rev_id' => $ids,
 108                         ],
 109                         'options' => [ 'ORDER BY' => 'ar_rev_id DESC' ],
 110                         'join_conds' => [],
 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 Revision::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 }