includes/api/ApiQueryDeletedRevisions.php

   1 <?php
   2 /**
   3  * Created on Oct 3, 2014
   4  *
   5  * Copyright © 2014 Brad Jorsch "bjorsch@wikimedia.org"
   6  *
   7  * Heavily based on ApiQueryDeletedrevs,
   8  * Copyright © 2007 Roan Kattouw "<Firstname>.<Lastname>@gmail.com"
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  *
  25  * @file
  26  */
  27
  28 /**
  29  * Query module to enumerate deleted revisions for pages.
  30  *
  31  * @ingroup API
  32  */
  33 class ApiQueryDeletedRevisions extends ApiQueryRevisionsBase {
  34
  35         public function __construct( ApiQuery $query, $moduleName ) {
  36                 parent::__construct( $query, $moduleName, 'drv' );
  37         }
  38
  39         protected function run( ApiPageSet $resultPageSet = null ) {
  40                 $user = $this->getUser();
  41                 // Before doing anything at all, let's check permissions
  42                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
  43                         $this->dieUsage(
  44                                 'You don\'t have permission to view deleted revision information',
  45                                 'permissiondenied'
  46                         );
  47                 }
  48
  49                 $result = $this->getResult();
  50                 $pageSet = $this->getPageSet();
  51                 $pageMap = $pageSet->getGoodAndMissingTitlesByNamespace();
  52                 $pageCount = count( $pageSet->getGoodAndMissingTitles() );
  53                 $revCount = $pageSet->getRevisionCount();
  54                 if ( $revCount === 0 && $pageCount === 0 ) {
  55                         // Nothing to do
  56                         return;
  57                 }
  58                 if ( $revCount !== 0 && count( $pageSet->getDeletedRevisionIDs() ) === 0 ) {
  59                         // Nothing to do, revisions were supplied but none are deleted
  60                         return;
  61                 }
  62
  63                 $params = $this->extractRequestParams( false );
  64
  65                 $db = $this->getDB();
  66
  67                 if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
  68                         $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
  69                 }
  70
  71                 $this->addTables( 'archive' );
  72                 if ( $resultPageSet === null ) {
  73                         $this->parseParameters( $params );
  74                         $this->addFields( Revision::selectArchiveFields() );
  75                         $this->addFields( array( 'ar_title', 'ar_namespace' ) );
  76                 } else {
  77                         $this->limit = $this->getParameter( 'limit' ) ?: 10;
  78                         $this->addFields( array( 'ar_title', 'ar_namespace', 'ar_timestamp', 'ar_rev_id', 'ar_id' ) );
  79                 }
  80
  81                 if ( $this->fld_tags ) {
  82                         $this->addTables( 'tag_summary' );
  83                         $this->addJoinConds(
  84                                 array( 'tag_summary' => array( 'LEFT JOIN', array( 'ar_rev_id=ts_rev_id' ) ) )
  85                         );
  86                         $this->addFields( 'ts_tags' );
  87                 }
  88
  89                 if ( !is_null( $params['tag'] ) ) {
  90                         $this->addTables( 'change_tag' );
  91                         $this->addJoinConds(
  92                                 array( 'change_tag' => array( 'INNER JOIN', array( 'ar_rev_id=ct_rev_id' ) ) )
  93                         );
  94                         $this->addWhereFld( 'ct_tag', $params['tag'] );
  95                 }
  96
  97                 if ( $this->fetchContent ) {
  98                         // Modern MediaWiki has the content for deleted revs in the 'text'
  99                         // table using fields old_text and old_flags. But revisions deleted
 100                         // pre-1.5 store the content in the 'archive' table directly using
 101                         // fields ar_text and ar_flags, and no corresponding 'text' row. So
 102                         // we have to LEFT JOIN and fetch all four fields.
 103                         $this->addTables( 'text' );
 104                         $this->addJoinConds(
 105                                 array( 'text' => array( 'LEFT JOIN', array( 'ar_text_id=old_id' ) ) )
 106                         );
 107                         $this->addFields( array( 'ar_text', 'ar_flags', 'old_text', 'old_flags' ) );
 108
 109                         // This also means stricter restrictions
 110                         if ( !$user->isAllowedAny( 'undelete', 'deletedtext' ) ) {
 111                                 $this->dieUsage(
 112                                         'You don\'t have permission to view deleted revision content',
 113                                         'permissiondenied'
 114                                 );
 115                         }
 116                 }
 117
 118                 $dir = $params['dir'];
 119
 120                 if ( $revCount !== 0 ) {
 121                         $this->addWhere( array(
 122                                 'ar_rev_id' => array_keys( $pageSet->getDeletedRevisionIDs() )
 123                         ) );
 124                 } else {
 125                         // We need a custom WHERE clause that matches all titles.
 126                         $lb = new LinkBatch( $pageSet->getGoodAndMissingTitles() );
 127                         $where = $lb->constructSet( 'ar', $db );
 128                         $this->addWhere( $where );
 129                 }
 130
 131                 if ( !is_null( $params['user'] ) ) {
 132                         $this->addWhereFld( 'ar_user_text', $params['user'] );
 133                 } elseif ( !is_null( $params['excludeuser'] ) ) {
 134                         $this->addWhere( 'ar_user_text != ' .
 135                                 $db->addQuotes( $params['excludeuser'] ) );
 136                 }
 137
 138                 if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 139                         // Paranoia: avoid brute force searches (bug 17342)
 140                         // (shouldn't be able to get here without 'deletedhistory', but
 141                         // check it again just in case)
 142                         if ( !$user->isAllowed( 'deletedhistory' ) ) {
 143                                 $bitmask = Revision::DELETED_USER;
 144                         } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 145                                 $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 146                         } else {
 147                                 $bitmask = 0;
 148                         }
 149                         if ( $bitmask ) {
 150                                 $this->addWhere( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
 151                         }
 152                 }
 153
 154                 if ( !is_null( $params['continue'] ) ) {
 155                         $cont = explode( '|', $params['continue'] );
 156                         $op = ( $dir == 'newer' ? '>' : '<' );
 157                         if ( $revCount !== 0 ) {
 158                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 159                                 $rev = intval( $cont[0] );
 160                                 $this->dieContinueUsageIf( strval( $rev ) !== $cont[0] );
 161                                 $ar_id = (int)$cont[1];
 162                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
 163                                 $this->addWhere( "ar_rev_id $op $rev OR " .
 164                                         "(ar_rev_id = $rev AND " .
 165                                         "ar_id $op= $ar_id)" );
 166                         } else {
 167                                 $this->dieContinueUsageIf( count( $cont ) != 4 );
 168                                 $ns = intval( $cont[0] );
 169                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 170                                 $title = $db->addQuotes( $cont[1] );
 171                                 $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
 172                                 $ar_id = (int)$cont[3];
 173                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
 174                                 $this->addWhere( "ar_namespace $op $ns OR " .
 175                                         "(ar_namespace = $ns AND " .
 176                                         "(ar_title $op $title OR " .
 177                                         "(ar_title = $title AND " .
 178                                         "(ar_timestamp $op $ts OR " .
 179                                         "(ar_timestamp = $ts AND " .
 180                                         "ar_id $op= $ar_id)))))" );
 181                         }
 182                 }
 183
 184                 $this->addOption( 'LIMIT', $this->limit + 1 );
 185
 186                 if ( $revCount !== 0 ) {
 187                         // Sort by ar_rev_id when querying by ar_rev_id
 188                         $this->addWhereRange( 'ar_rev_id', $dir, null, null );
 189                 } else {
 190                         // Sort by ns and title in the same order as timestamp for efficiency
 191                         // But only when not already unique in the query
 192                         if ( count( $pageMap ) > 1 ) {
 193                                 $this->addWhereRange( 'ar_namespace', $dir, null, null );
 194                         }
 195                         $oneTitle = key( reset( $pageMap ) );
 196                         foreach ( $pageMap as $pages ) {
 197                                 if ( count( $pages ) > 1 || key( $pages ) !== $oneTitle ) {
 198                                         $this->addWhereRange( 'ar_title', $dir, null, null );
 199                                         break;
 200                                 }
 201                         }
 202                         $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
 203                 }
 204                 // Include in ORDER BY for uniqueness
 205                 $this->addWhereRange( 'ar_id', $dir, null, null );
 206
 207                 $res = $this->select( __METHOD__ );
 208                 $count = 0;
 209                 $generated = array();
 210                 foreach ( $res as $row ) {
 211                         if ( ++$count > $this->limit ) {
 212                                 // We've had enough
 213                                 $this->setContinueEnumParameter( 'continue',
 214                                         $revCount
 215                                                 ? "$row->ar_rev_id|$row->ar_id"
 216                                                 : "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 217                                 );
 218                                 break;
 219                         }
 220
 221                         if ( $resultPageSet !== null ) {
 222                                 $generated[] = $row->ar_rev_id;
 223                         } else {
 224                                 if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 225                                         // Was it converted?
 226                                         $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 227                                         $converted = $pageSet->getConvertedTitles();
 228                                         if ( $title && isset( $converted[$title->getPrefixedText()] ) ) {
 229                                                 $title = Title::newFromText( $converted[$title->getPrefixedText()] );
 230                                                 if ( $title && isset( $pageMap[$title->getNamespace()][$title->getDBkey()] ) ) {
 231                                                         $pageMap[$row->ar_namespace][$row->ar_title] =
 232                                                                 $pageMap[$title->getNamespace()][$title->getDBkey()];
 233                                                 }
 234                                         }
 235                                 }
 236                                 if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 237                                         ApiBase::dieDebug( "Found row in archive (ar_id={$row->ar_id}) that didn't " .
 238                                                 "get processed by ApiPageSet" );
 239                                 }
 240
 241                                 $fit = $this->addPageSubItem(
 242                                         $pageMap[$row->ar_namespace][$row->ar_title],
 243                                         $this->extractRevisionInfo( Revision::newFromArchiveRow( $row ), $row ),
 244                                         'rev'
 245                                 );
 246                                 if ( !$fit ) {
 247                                         $this->setContinueEnumParameter( 'continue',
 248                                                 $revCount
 249                                                         ? "$row->ar_rev_id|$row->ar_id"
 250                                                         : "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 251                                         );
 252                                         break;
 253                                 }
 254                         }
 255                 }
 256
 257                 if ( $resultPageSet !== null ) {
 258                         $resultPageSet->populateFromRevisionIDs( $generated );
 259                 }
 260         }
 261
 262         public function getAllowedParams() {
 263                 return parent::getAllowedParams() + array(
 264                         'start' => array(
 265                                 ApiBase::PARAM_TYPE => 'timestamp',
 266                         ),
 267                         'end' => array(
 268                                 ApiBase::PARAM_TYPE => 'timestamp',
 269                         ),
 270                         'dir' => array(
 271                                 ApiBase::PARAM_TYPE => array(
 272                                         'newer',
 273                                         'older'
 274                                 ),
 275                                 ApiBase::PARAM_DFLT => 'older',
 276                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 277                         ),
 278                         'tag' => null,
 279                         'user' => array(
 280                                 ApiBase::PARAM_TYPE => 'user'
 281                         ),
 282                         'excludeuser' => array(
 283                                 ApiBase::PARAM_TYPE => 'user'
 284                         ),
 285                         'continue' => array(
 286                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 287                         ),
 288                 );
 289         }
 290
 291         protected function getExamplesMessages() {
 292                 return array(
 293                         'action=query&prop=deletedrevisions&titles=Main%20Page|Talk:Main%20Page&' .
 294                                 'drvprop=user|comment|content'
 295                                 => 'apihelp-query+deletedrevisions-example-titles',
 296                         'action=query&prop=deletedrevisions&revids=123456'
 297                                 => 'apihelp-query+deletedrevisions-example-revids',
 298                 );
 299         }
 300
 301         public function getHelpUrls() {
 302                 return 'https://www.mediawiki.org/wiki/API:Deletedrevisions';
 303         }
 304 }