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