includes/api/ApiQueryAllDeletedRevisions.php

   1 <?php
   2 /**
   3  * Copyright © 2014 Wikimedia Foundation and contributors
   4  *
   5  * Heavily based on ApiQueryDeletedrevs,
   6  * Copyright © 2007 Roan Kattouw "<Firstname>.<Lastname>@gmail.com"
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 /**
  27  * Query module to enumerate all deleted revisions.
  28  *
  29  * @ingroup API
  30  */
  31 class ApiQueryAllDeletedRevisions extends ApiQueryRevisionsBase {
  32
  33         public function __construct( ApiQuery $query, $moduleName ) {
  34                 parent::__construct( $query, $moduleName, 'adr' );
  35         }
  36
  37         /**
  38          * @param ApiPageSet $resultPageSet
  39          * @return void
  40          */
  41         protected function run( ApiPageSet $resultPageSet = null ) {
  42                 // Before doing anything at all, let's check permissions
  43                 $this->checkUserRightsAny( 'deletedhistory' );
  44
  45                 $user = $this->getUser();
  46                 $db = $this->getDB();
  47                 $params = $this->extractRequestParams( false );
  48
  49                 $result = $this->getResult();
  50
  51                 // If the user wants no namespaces, they get no pages.
  52                 if ( $params['namespace'] === [] ) {
  53                         if ( $resultPageSet === null ) {
  54                                 $result->addValue( 'query', $this->getModuleName(), [] );
  55                         }
  56                         return;
  57                 }
  58
  59                 // This module operates in two modes:
  60                 // 'user': List deleted revs by a certain user
  61                 // 'all': List all deleted revs in NS
  62                 $mode = 'all';
  63                 if ( !is_null( $params['user'] ) ) {
  64                         $mode = 'user';
  65                 }
  66
  67                 if ( $mode == 'user' ) {
  68                         foreach ( [ 'from', 'to', 'prefix', 'excludeuser' ] as $param ) {
  69                                 if ( !is_null( $params[$param] ) ) {
  70                                         $p = $this->getModulePrefix();
  71                                         $this->dieWithError(
  72                                                 [ 'apierror-invalidparammix-cannotusewith', $p.$param, "{$p}user" ],
  73                                                 'invalidparammix'
  74                                         );
  75                                 }
  76                         }
  77                 } else {
  78                         foreach ( [ 'start', 'end' ] as $param ) {
  79                                 if ( !is_null( $params[$param] ) ) {
  80                                         $p = $this->getModulePrefix();
  81                                         $this->dieWithError(
  82                                                 [ 'apierror-invalidparammix-mustusewith', $p.$param, "{$p}user" ],
  83                                                 'invalidparammix'
  84                                         );
  85                                 }
  86                         }
  87                 }
  88
  89                 // If we're generating titles only, we can use DISTINCT for a better
  90                 // query. But we can't do that in 'user' mode (wrong index), and we can
  91                 // only do it when sorting ASC (because MySQL apparently can't use an
  92                 // index backwards for grouping even though it can for ORDER BY, WTF?)
  93                 $dir = $params['dir'];
  94                 $optimizeGenerateTitles = false;
  95                 if ( $mode === 'all' && $params['generatetitles'] && $resultPageSet !== null ) {
  96                         if ( $dir === 'newer' ) {
  97                                 $optimizeGenerateTitles = true;
  98                         } else {
  99                                 $p = $this->getModulePrefix();
 100                                 $this->addWarning( [ 'apiwarn-alldeletedrevisions-performance', $p ], 'performance' );
 101                         }
 102                 }
 103
 104                 if ( $resultPageSet === null ) {
 105                         $this->parseParameters( $params );
 106                         $arQuery = Revision::getArchiveQueryInfo();
 107                         $this->addTables( $arQuery['tables'] );
 108                         $this->addJoinConds( $arQuery['joins'] );
 109                         $this->addFields( $arQuery['fields'] );
 110                         $this->addFields( [ 'ar_title', 'ar_namespace' ] );
 111                 } else {
 112                         $this->limit = $this->getParameter( 'limit' ) ?: 10;
 113                         $this->addTables( 'archive' );
 114                         $this->addFields( [ 'ar_title', 'ar_namespace' ] );
 115                         if ( $optimizeGenerateTitles ) {
 116                                 $this->addOption( 'DISTINCT' );
 117                         } else {
 118                                 $this->addFields( [ 'ar_timestamp', 'ar_rev_id', 'ar_id' ] );
 119                         }
 120                 }
 121
 122                 if ( $this->fld_tags ) {
 123                         $this->addTables( 'tag_summary' );
 124                         $this->addJoinConds(
 125                                 [ 'tag_summary' => [ 'LEFT JOIN', [ 'ar_rev_id=ts_rev_id' ] ] ]
 126                         );
 127                         $this->addFields( 'ts_tags' );
 128                 }
 129
 130                 if ( !is_null( $params['tag'] ) ) {
 131                         $this->addTables( 'change_tag' );
 132                         $this->addJoinConds(
 133                                 [ 'change_tag' => [ 'INNER JOIN', [ 'ar_rev_id=ct_rev_id' ] ] ]
 134                         );
 135                         $this->addWhereFld( 'ct_tag', $params['tag'] );
 136                 }
 137
 138                 if ( $this->fetchContent ) {
 139                         // Modern MediaWiki has the content for deleted revs in the 'text'
 140                         // table using fields old_text and old_flags. But revisions deleted
 141                         // pre-1.5 store the content in the 'archive' table directly using
 142                         // fields ar_text and ar_flags, and no corresponding 'text' row. So
 143                         // we have to LEFT JOIN and fetch all four fields.
 144                         $this->addTables( 'text' );
 145                         $this->addJoinConds(
 146                                 [ 'text' => [ 'LEFT JOIN', [ 'ar_text_id=old_id' ] ] ]
 147                         );
 148                         $this->addFields( [ 'ar_text', 'ar_flags', 'old_text', 'old_flags' ] );
 149
 150                         // This also means stricter restrictions
 151                         $this->checkUserRightsAny( [ 'deletedtext', 'undelete' ] );
 152                 }
 153
 154                 $miser_ns = null;
 155
 156                 if ( $mode == 'all' ) {
 157                         if ( $params['namespace'] !== null ) {
 158                                 $namespaces = $params['namespace'];
 159                         } else {
 160                                 $namespaces = MWNamespace::getValidNamespaces();
 161                         }
 162                         $this->addWhereFld( 'ar_namespace', $namespaces );
 163
 164                         // For from/to/prefix, we have to consider the potential
 165                         // transformations of the title in all specified namespaces.
 166                         // Generally there will be only one transformation, but wikis with
 167                         // some namespaces case-sensitive could have two.
 168                         if ( $params['from'] !== null || $params['to'] !== null ) {
 169                                 $isDirNewer = ( $dir === 'newer' );
 170                                 $after = ( $isDirNewer ? '>=' : '<=' );
 171                                 $before = ( $isDirNewer ? '<=' : '>=' );
 172                                 $where = [];
 173                                 foreach ( $namespaces as $ns ) {
 174                                         $w = [];
 175                                         if ( $params['from'] !== null ) {
 176                                                 $w[] = 'ar_title' . $after .
 177                                                         $db->addQuotes( $this->titlePartToKey( $params['from'], $ns ) );
 178                                         }
 179                                         if ( $params['to'] !== null ) {
 180                                                 $w[] = 'ar_title' . $before .
 181                                                         $db->addQuotes( $this->titlePartToKey( $params['to'], $ns ) );
 182                                         }
 183                                         $w = $db->makeList( $w, LIST_AND );
 184                                         $where[$w][] = $ns;
 185                                 }
 186                                 if ( count( $where ) == 1 ) {
 187                                         $where = key( $where );
 188                                         $this->addWhere( $where );
 189                                 } else {
 190                                         $where2 = [];
 191                                         foreach ( $where as $w => $ns ) {
 192                                                 $where2[] = $db->makeList( [ $w, 'ar_namespace' => $ns ], LIST_AND );
 193                                         }
 194                                         $this->addWhere( $db->makeList( $where2, LIST_OR ) );
 195                                 }
 196                         }
 197
 198                         if ( isset( $params['prefix'] ) ) {
 199                                 $where = [];
 200                                 foreach ( $namespaces as $ns ) {
 201                                         $w = 'ar_title' . $db->buildLike(
 202                                                 $this->titlePartToKey( $params['prefix'], $ns ),
 203                                                 $db->anyString() );
 204                                         $where[$w][] = $ns;
 205                                 }
 206                                 if ( count( $where ) == 1 ) {
 207                                         $where = key( $where );
 208                                         $this->addWhere( $where );
 209                                 } else {
 210                                         $where2 = [];
 211                                         foreach ( $where as $w => $ns ) {
 212                                                 $where2[] = $db->makeList( [ $w, 'ar_namespace' => $ns ], LIST_AND );
 213                                         }
 214                                         $this->addWhere( $db->makeList( $where2, LIST_OR ) );
 215                                 }
 216                         }
 217                 } else {
 218                         if ( $this->getConfig()->get( 'MiserMode' ) ) {
 219                                 $miser_ns = $params['namespace'];
 220                         } else {
 221                                 $this->addWhereFld( 'ar_namespace', $params['namespace'] );
 222                         }
 223                         $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
 224                 }
 225
 226                 if ( !is_null( $params['user'] ) ) {
 227                         $this->addWhereFld( 'ar_user_text', $params['user'] );
 228                 } elseif ( !is_null( $params['excludeuser'] ) ) {
 229                         $this->addWhere( 'ar_user_text != ' .
 230                                 $db->addQuotes( $params['excludeuser'] ) );
 231                 }
 232
 233                 if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 234                         // Paranoia: avoid brute force searches (T19342)
 235                         // (shouldn't be able to get here without 'deletedhistory', but
 236                         // check it again just in case)
 237                         if ( !$user->isAllowed( 'deletedhistory' ) ) {
 238                                 $bitmask = Revision::DELETED_USER;
 239                         } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 240                                 $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 241                         } else {
 242                                 $bitmask = 0;
 243                         }
 244                         if ( $bitmask ) {
 245                                 $this->addWhere( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
 246                         }
 247                 }
 248
 249                 if ( !is_null( $params['continue'] ) ) {
 250                         $cont = explode( '|', $params['continue'] );
 251                         $op = ( $dir == 'newer' ? '>' : '<' );
 252                         if ( $optimizeGenerateTitles ) {
 253                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 254                                 $ns = intval( $cont[0] );
 255                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 256                                 $title = $db->addQuotes( $cont[1] );
 257                                 $this->addWhere( "ar_namespace $op $ns OR " .
 258                                         "(ar_namespace = $ns AND ar_title $op= $title)" );
 259                         } elseif ( $mode == 'all' ) {
 260                                 $this->dieContinueUsageIf( count( $cont ) != 4 );
 261                                 $ns = intval( $cont[0] );
 262                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 263                                 $title = $db->addQuotes( $cont[1] );
 264                                 $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
 265                                 $ar_id = (int)$cont[3];
 266                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
 267                                 $this->addWhere( "ar_namespace $op $ns OR " .
 268                                         "(ar_namespace = $ns AND " .
 269                                         "(ar_title $op $title OR " .
 270                                         "(ar_title = $title AND " .
 271                                         "(ar_timestamp $op $ts OR " .
 272                                         "(ar_timestamp = $ts AND " .
 273                                         "ar_id $op= $ar_id)))))" );
 274                         } else {
 275                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 276                                 $ts = $db->addQuotes( $db->timestamp( $cont[0] ) );
 277                                 $ar_id = (int)$cont[1];
 278                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
 279                                 $this->addWhere( "ar_timestamp $op $ts OR " .
 280                                         "(ar_timestamp = $ts AND " .
 281                                         "ar_id $op= $ar_id)" );
 282                         }
 283                 }
 284
 285                 $this->addOption( 'LIMIT', $this->limit + 1 );
 286
 287                 $sort = ( $dir == 'newer' ? '' : ' DESC' );
 288                 $orderby = [];
 289                 if ( $optimizeGenerateTitles ) {
 290                         // Targeting index name_title_timestamp
 291                         if ( $params['namespace'] === null || count( array_unique( $params['namespace'] ) ) > 1 ) {
 292                                 $orderby[] = "ar_namespace $sort";
 293                         }
 294                         $orderby[] = "ar_title $sort";
 295                 } elseif ( $mode == 'all' ) {
 296                         // Targeting index name_title_timestamp
 297                         if ( $params['namespace'] === null || count( array_unique( $params['namespace'] ) ) > 1 ) {
 298                                 $orderby[] = "ar_namespace $sort";
 299                         }
 300                         $orderby[] = "ar_title $sort";
 301                         $orderby[] = "ar_timestamp $sort";
 302                         $orderby[] = "ar_id $sort";
 303                 } else {
 304                         // Targeting index usertext_timestamp
 305                         // 'user' is always constant.
 306                         $orderby[] = "ar_timestamp $sort";
 307                         $orderby[] = "ar_id $sort";
 308                 }
 309                 $this->addOption( 'ORDER BY', $orderby );
 310
 311                 $res = $this->select( __METHOD__ );
 312                 $pageMap = []; // Maps ns&title to array index
 313                 $count = 0;
 314                 $nextIndex = 0;
 315                 $generated = [];
 316                 foreach ( $res as $row ) {
 317                         if ( ++$count > $this->limit ) {
 318                                 // We've had enough
 319                                 if ( $optimizeGenerateTitles ) {
 320                                         $this->setContinueEnumParameter( 'continue', "$row->ar_namespace|$row->ar_title" );
 321                                 } elseif ( $mode == 'all' ) {
 322                                         $this->setContinueEnumParameter( 'continue',
 323                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 324                                         );
 325                                 } else {
 326                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 327                                 }
 328                                 break;
 329                         }
 330
 331                         // Miser mode namespace check
 332                         if ( $miser_ns !== null && !in_array( $row->ar_namespace, $miser_ns ) ) {
 333                                 continue;
 334                         }
 335
 336                         if ( $resultPageSet !== null ) {
 337                                 if ( $params['generatetitles'] ) {
 338                                         $key = "{$row->ar_namespace}:{$row->ar_title}";
 339                                         if ( !isset( $generated[$key] ) ) {
 340                                                 $generated[$key] = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 341                                         }
 342                                 } else {
 343                                         $generated[] = $row->ar_rev_id;
 344                                 }
 345                         } else {
 346                                 $revision = Revision::newFromArchiveRow( $row );
 347                                 $rev = $this->extractRevisionInfo( $revision, $row );
 348
 349                                 if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 350                                         $index = $nextIndex++;
 351                                         $pageMap[$row->ar_namespace][$row->ar_title] = $index;
 352                                         $title = $revision->getTitle();
 353                                         $a = [
 354                                                 'pageid' => $title->getArticleID(),
 355                                                 'revisions' => [ $rev ],
 356                                         ];
 357                                         ApiResult::setIndexedTagName( $a['revisions'], 'rev' );
 358                                         ApiQueryBase::addTitleInfo( $a, $title );
 359                                         $fit = $result->addValue( [ 'query', $this->getModuleName() ], $index, $a );
 360                                 } else {
 361                                         $index = $pageMap[$row->ar_namespace][$row->ar_title];
 362                                         $fit = $result->addValue(
 363                                                 [ 'query', $this->getModuleName(), $index, 'revisions' ],
 364                                                 null, $rev );
 365                                 }
 366                                 if ( !$fit ) {
 367                                         if ( $mode == 'all' ) {
 368                                                 $this->setContinueEnumParameter( 'continue',
 369                                                         "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 370                                                 );
 371                                         } else {
 372                                                 $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 373                                         }
 374                                         break;
 375                                 }
 376                         }
 377                 }
 378
 379                 if ( $resultPageSet !== null ) {
 380                         if ( $params['generatetitles'] ) {
 381                                 $resultPageSet->populateFromTitles( $generated );
 382                         } else {
 383                                 $resultPageSet->populateFromRevisionIDs( $generated );
 384                         }
 385                 } else {
 386                         $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'page' );
 387                 }
 388         }
 389
 390         public function getAllowedParams() {
 391                 $ret = parent::getAllowedParams() + [
 392                         'user' => [
 393                                 ApiBase::PARAM_TYPE => 'user'
 394                         ],
 395                         'namespace' => [
 396                                 ApiBase::PARAM_ISMULTI => true,
 397                                 ApiBase::PARAM_TYPE => 'namespace',
 398                         ],
 399                         'start' => [
 400                                 ApiBase::PARAM_TYPE => 'timestamp',
 401                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'useronly' ] ],
 402                         ],
 403                         'end' => [
 404                                 ApiBase::PARAM_TYPE => 'timestamp',
 405                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'useronly' ] ],
 406                         ],
 407                         'dir' => [
 408                                 ApiBase::PARAM_TYPE => [
 409                                         'newer',
 410                                         'older'
 411                                 ],
 412                                 ApiBase::PARAM_DFLT => 'older',
 413                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 414                         ],
 415                         'from' => [
 416                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'nonuseronly' ] ],
 417                         ],
 418                         'to' => [
 419                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'nonuseronly' ] ],
 420                         ],
 421                         'prefix' => [
 422                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'nonuseronly' ] ],
 423                         ],
 424                         'excludeuser' => [
 425                                 ApiBase::PARAM_TYPE => 'user',
 426                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'nonuseronly' ] ],
 427                         ],
 428                         'tag' => null,
 429                         'continue' => [
 430                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 431                         ],
 432                         'generatetitles' => [
 433                                 ApiBase::PARAM_DFLT => false
 434                         ],
 435                 ];
 436
 437                 if ( $this->getConfig()->get( 'MiserMode' ) ) {
 438                         $ret['user'][ApiBase::PARAM_HELP_MSG_APPEND] = [
 439                                 'apihelp-query+alldeletedrevisions-param-miser-user-namespace',
 440                         ];
 441                         $ret['namespace'][ApiBase::PARAM_HELP_MSG_APPEND] = [
 442                                 'apihelp-query+alldeletedrevisions-param-miser-user-namespace',
 443                         ];
 444                 }
 445
 446                 return $ret;
 447         }
 448
 449         protected function getExamplesMessages() {
 450                 return [
 451                         'action=query&list=alldeletedrevisions&adruser=Example&adrlimit=50'
 452                                 => 'apihelp-query+alldeletedrevisions-example-user',
 453                         'action=query&list=alldeletedrevisions&adrdir=newer&adrnamespace=0&adrlimit=50'
 454                                 => 'apihelp-query+alldeletedrevisions-example-ns-main',
 455                 ];
 456         }
 457
 458         public function getHelpUrls() {
 459                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Alldeletedrevisions';
 460         }
 461 }