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