includes/Revision.php

   1 <?php
   2 /**
   3  * Representation of a page version.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Revision\MutableRevisionRecord;
  24 use MediaWiki\Revision\RevisionAccessException;
  25 use MediaWiki\Revision\RevisionFactory;
  26 use MediaWiki\Revision\RevisionLookup;
  27 use MediaWiki\Revision\RevisionRecord;
  28 use MediaWiki\Revision\RevisionStore;
  29 use MediaWiki\Revision\RevisionStoreRecord;
  30 use MediaWiki\Revision\SlotRecord;
  31 use MediaWiki\Storage\SqlBlobStore;
  32 use Wikimedia\Rdbms\IDatabase;
  33 use MediaWiki\Linker\LinkTarget;
  34 use MediaWiki\MediaWikiServices;
  35 use Wikimedia\Rdbms\ResultWrapper;
  36 use Wikimedia\Rdbms\FakeResultWrapper;
  37
  38 /**
  39  * @deprecated since 1.31, use RevisionRecord, RevisionStore, and BlobStore instead.
  40  */
  41 class Revision implements IDBAccessObject {
  42
  43         /** @var RevisionRecord */
  44         protected $mRecord;
  45
  46         // Revision deletion constants
  47         const DELETED_TEXT = RevisionRecord::DELETED_TEXT;
  48         const DELETED_COMMENT = RevisionRecord::DELETED_COMMENT;
  49         const DELETED_USER = RevisionRecord::DELETED_USER;
  50         const DELETED_RESTRICTED = RevisionRecord::DELETED_RESTRICTED;
  51         const SUPPRESSED_USER = RevisionRecord::SUPPRESSED_USER;
  52         const SUPPRESSED_ALL = RevisionRecord::SUPPRESSED_ALL;
  53
  54         // Audience options for accessors
  55         const FOR_PUBLIC = RevisionRecord::FOR_PUBLIC;
  56         const FOR_THIS_USER = RevisionRecord::FOR_THIS_USER;
  57         const RAW = RevisionRecord::RAW;
  58
  59         const TEXT_CACHE_GROUP = SqlBlobStore::TEXT_CACHE_GROUP;
  60
  61         /**
  62          * @return RevisionStore
  63          */
  64         protected static function getRevisionStore( $wiki = false ) {
  65                 if ( $wiki ) {
  66                         return MediaWikiServices::getInstance()->getRevisionStoreFactory()
  67                                 ->getRevisionStore( $wiki );
  68                 } else {
  69                         return MediaWikiServices::getInstance()->getRevisionStore();
  70                 }
  71         }
  72
  73         /**
  74          * @return RevisionLookup
  75          */
  76         protected static function getRevisionLookup() {
  77                 return MediaWikiServices::getInstance()->getRevisionLookup();
  78         }
  79
  80         /**
  81          * @return RevisionFactory
  82          */
  83         protected static function getRevisionFactory() {
  84                 return MediaWikiServices::getInstance()->getRevisionFactory();
  85         }
  86
  87         /**
  88          * @param bool|string $wiki The ID of the target wiki database. Use false for the local wiki.
  89          *
  90          * @return SqlBlobStore
  91          */
  92         protected static function getBlobStore( $wiki = false ) {
  93                 $store = MediaWikiServices::getInstance()
  94                         ->getBlobStoreFactory()
  95                         ->newSqlBlobStore( $wiki );
  96
  97                 if ( !$store instanceof SqlBlobStore ) {
  98                         throw new RuntimeException(
  99                                 'The backwards compatibility code in Revision currently requires the BlobStore '
 100                                 . 'service to be an SqlBlobStore instance, but it is a ' . get_class( $store )
 101                         );
 102                 }
 103
 104                 return $store;
 105         }
 106
 107         /**
 108          * Load a page revision from a given revision ID number.
 109          * Returns null if no such revision can be found.
 110          *
 111          * $flags include:
 112          *      Revision::READ_LATEST  : Select the data from the master
 113          *      Revision::READ_LOCKING : Select & lock the data from the master
 114          *
 115          * @param int $id
 116          * @param int $flags (optional)
 117          * @return Revision|null
 118          */
 119         public static function newFromId( $id, $flags = 0 ) {
 120                 $rec = self::getRevisionLookup()->getRevisionById( $id, $flags );
 121                 return $rec === null ? null : new Revision( $rec, $flags );
 122         }
 123
 124         /**
 125          * Load either the current, or a specified, revision
 126          * that's attached to a given link target. If not attached
 127          * to that link target, will return null.
 128          *
 129          * $flags include:
 130          *      Revision::READ_LATEST  : Select the data from the master
 131          *      Revision::READ_LOCKING : Select & lock the data from the master
 132          *
 133          * @param LinkTarget $linkTarget
 134          * @param int $id (optional)
 135          * @param int $flags Bitfield (optional)
 136          * @return Revision|null
 137          */
 138         public static function newFromTitle( LinkTarget $linkTarget, $id = 0, $flags = 0 ) {
 139                 $rec = self::getRevisionLookup()->getRevisionByTitle( $linkTarget, $id, $flags );
 140                 return $rec === null ? null : new Revision( $rec, $flags );
 141         }
 142
 143         /**
 144          * Load either the current, or a specified, revision
 145          * that's attached to a given page ID.
 146          * Returns null if no such revision can be found.
 147          *
 148          * $flags include:
 149          *      Revision::READ_LATEST  : Select the data from the master (since 1.20)
 150          *      Revision::READ_LOCKING : Select & lock the data from the master
 151          *
 152          * @param int $pageId
 153          * @param int $revId (optional)
 154          * @param int $flags Bitfield (optional)
 155          * @return Revision|null
 156          */
 157         public static function newFromPageId( $pageId, $revId = 0, $flags = 0 ) {
 158                 $rec = self::getRevisionLookup()->getRevisionByPageId( $pageId, $revId, $flags );
 159                 return $rec === null ? null : new Revision( $rec, $flags );
 160         }
 161
 162         /**
 163          * Make a fake revision object from an archive table row. This is queried
 164          * for permissions or even inserted (as in Special:Undelete)
 165          *
 166          * @param object $row
 167          * @param array $overrides
 168          *
 169          * @throws MWException
 170          * @return Revision
 171          */
 172         public static function newFromArchiveRow( $row, $overrides = [] ) {
 173                 /**
 174                  * MCR Migration: https://phabricator.wikimedia.org/T183564
 175                  * This method used to overwrite attributes, then passed to Revision::__construct
 176                  * RevisionStore::newRevisionFromArchiveRow instead overrides row field names
 177                  * So do a conversion here.
 178                  */
 179                 if ( array_key_exists( 'page', $overrides ) ) {
 180                         $overrides['page_id'] = $overrides['page'];
 181                         unset( $overrides['page'] );
 182                 }
 183
 184                 /**
 185                  * We require a Title for both the Revision object and the RevisionRecord.
 186                  * Below is duplicated logic from RevisionStore::newRevisionFromArchiveRow
 187                  * to fetch a title in order pass it into the Revision object.
 188                  */
 189                 $title = null;
 190                 if ( isset( $overrides['title'] ) ) {
 191                         if ( !( $overrides['title'] instanceof Title ) ) {
 192                                 throw new MWException( 'title field override must contain a Title object.' );
 193                         }
 194
 195                         $title = $overrides['title'];
 196                 }
 197                 if ( $title !== null ) {
 198                         if ( isset( $row->ar_namespace ) && isset( $row->ar_title ) ) {
 199                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 200                         } else {
 201                                 throw new InvalidArgumentException(
 202                                         'A Title or ar_namespace and ar_title must be given'
 203                                 );
 204                         }
 205                 }
 206
 207                 $rec = self::getRevisionFactory()->newRevisionFromArchiveRow( $row, 0, $title, $overrides );
 208                 return new Revision( $rec, self::READ_NORMAL, $title );
 209         }
 210
 211         /**
 212          * @since 1.19
 213          *
 214          * MCR migration note: replaced by RevisionStore::newRevisionFromRow(). Note that
 215          * newFromRow() also accepts arrays, while newRevisionFromRow() does not. Instead,
 216          * a MutableRevisionRecord should be constructed directly.
 217          * RevisionStore::newMutableRevisionFromArray() can be used as a temporary replacement,
 218          * but should be avoided.
 219          *
 220          * @param object|array $row
 221          * @return Revision
 222          */
 223         public static function newFromRow( $row ) {
 224                 if ( is_array( $row ) ) {
 225                         $rec = self::getRevisionFactory()->newMutableRevisionFromArray( $row );
 226                 } else {
 227                         $rec = self::getRevisionFactory()->newRevisionFromRow( $row );
 228                 }
 229
 230                 return new Revision( $rec );
 231         }
 232
 233         /**
 234          * Load a page revision from a given revision ID number.
 235          * Returns null if no such revision can be found.
 236          *
 237          * @deprecated since 1.31, use RevisionStore::getRevisionById() instead.
 238          *
 239          * @param IDatabase $db
 240          * @param int $id
 241          * @return Revision|null
 242          */
 243         public static function loadFromId( $db, $id ) {
 244                 wfDeprecated( __METHOD__, '1.31' ); // no known callers
 245                 $rec = self::getRevisionStore()->loadRevisionFromId( $db, $id );
 246                 return $rec === null ? null : new Revision( $rec );
 247         }
 248
 249         /**
 250          * Load either the current, or a specified, revision
 251          * that's attached to a given page. If not attached
 252          * to that page, will return null.
 253          *
 254          * @deprecated since 1.31, use RevisionStore::getRevisionByPageId() instead.
 255          *
 256          * @param IDatabase $db
 257          * @param int $pageid
 258          * @param int $id
 259          * @return Revision|null
 260          */
 261         public static function loadFromPageId( $db, $pageid, $id = 0 ) {
 262                 $rec = self::getRevisionStore()->loadRevisionFromPageId( $db, $pageid, $id );
 263                 return $rec === null ? null : new Revision( $rec );
 264         }
 265
 266         /**
 267          * Load either the current, or a specified, revision
 268          * that's attached to a given page. If not attached
 269          * to that page, will return null.
 270          *
 271          * @deprecated since 1.31, use RevisionStore::getRevisionByTitle() instead.
 272          *
 273          * @param IDatabase $db
 274          * @param Title $title
 275          * @param int $id
 276          * @return Revision|null
 277          */
 278         public static function loadFromTitle( $db, $title, $id = 0 ) {
 279                 $rec = self::getRevisionStore()->loadRevisionFromTitle( $db, $title, $id );
 280                 return $rec === null ? null : new Revision( $rec );
 281         }
 282
 283         /**
 284          * Load the revision for the given title with the given timestamp.
 285          * WARNING: Timestamps may in some circumstances not be unique,
 286          * so this isn't the best key to use.
 287          *
 288          * @deprecated since 1.31, use RevisionStore::getRevisionByTimestamp()
 289          *   or RevisionStore::loadRevisionFromTimestamp() instead.
 290          *
 291          * @param IDatabase $db
 292          * @param Title $title
 293          * @param string $timestamp
 294          * @return Revision|null
 295          */
 296         public static function loadFromTimestamp( $db, $title, $timestamp ) {
 297                 $rec = self::getRevisionStore()->loadRevisionFromTimestamp( $db, $title, $timestamp );
 298                 return $rec === null ? null : new Revision( $rec );
 299         }
 300
 301         /**
 302          * Return a wrapper for a series of database rows to
 303          * fetch all of a given page's revisions in turn.
 304          * Each row can be fed to the constructor to get objects.
 305          *
 306          * @param LinkTarget $title
 307          * @return ResultWrapper
 308          * @deprecated Since 1.28, no callers in core nor in known extensions. No-op since 1.31.
 309          */
 310         public static function fetchRevision( LinkTarget $title ) {
 311                 wfDeprecated( __METHOD__, '1.31' );
 312                 return new FakeResultWrapper( [] );
 313         }
 314
 315         /**
 316          * Return the value of a select() JOIN conds array for the user table.
 317          * This will get user table rows for logged-in users.
 318          * @since 1.19
 319          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 320          * @return array
 321          */
 322         public static function userJoinCond() {
 323                 global $wgActorTableSchemaMigrationStage;
 324
 325                 wfDeprecated( __METHOD__, '1.31' );
 326                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 327                         // If code is using this instead of self::getQueryInfo(), there's
 328                         // no way the join it's trying to do can work once the old fields
 329                         // aren't being used anymore.
 330                         throw new BadMethodCallException(
 331                                 'Cannot use ' . __METHOD__
 332                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 333                         );
 334                 }
 335
 336                 return [ 'LEFT JOIN', [ 'rev_user != 0', 'user_id = rev_user' ] ];
 337         }
 338
 339         /**
 340          * Return the value of a select() page conds array for the page table.
 341          * This will assure that the revision(s) are not orphaned from live pages.
 342          * @since 1.19
 343          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 344          * @return array
 345          */
 346         public static function pageJoinCond() {
 347                 wfDeprecated( __METHOD__, '1.31' );
 348                 return [ 'INNER JOIN', [ 'page_id = rev_page' ] ];
 349         }
 350
 351         /**
 352          * Return the list of revision fields that should be selected to create
 353          * a new revision.
 354          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 355          * @return array
 356          */
 357         public static function selectFields() {
 358                 global $wgContentHandlerUseDB, $wgActorTableSchemaMigrationStage;
 359                 global $wgMultiContentRevisionSchemaMigrationStage;
 360
 361                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 362                         // If code is using this instead of self::getQueryInfo(), there's a
 363                         // decent chance it's going to try to directly access
 364                         // $row->rev_user or $row->rev_user_text and we can't give it
 365                         // useful values here once those aren't being used anymore.
 366                         throw new BadMethodCallException(
 367                                 'Cannot use ' . __METHOD__
 368                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 369                         );
 370                 }
 371
 372                 if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
 373                         // If code is using this instead of self::getQueryInfo(), there's a
 374                         // decent chance it's going to try to directly access
 375                         // $row->rev_text_id or $row->rev_content_model and we can't give it
 376                         // useful values here once those aren't being written anymore,
 377                         // and may not exist at all.
 378                         throw new BadMethodCallException(
 379                                 'Cannot use ' . __METHOD__ . ' when $wgMultiContentRevisionSchemaMigrationStage '
 380                                 . 'does not have SCHEMA_COMPAT_WRITE_OLD set.'
 381                         );
 382                 }
 383
 384                 wfDeprecated( __METHOD__, '1.31' );
 385
 386                 $fields = [
 387                         'rev_id',
 388                         'rev_page',
 389                         'rev_text_id',
 390                         'rev_timestamp',
 391                         'rev_user_text',
 392                         'rev_user',
 393                         'rev_actor' => 'NULL',
 394                         'rev_minor_edit',
 395                         'rev_deleted',
 396                         'rev_len',
 397                         'rev_parent_id',
 398                         'rev_sha1',
 399                 ];
 400
 401                 $fields += CommentStore::getStore()->getFields( 'rev_comment' );
 402
 403                 if ( $wgContentHandlerUseDB ) {
 404                         $fields[] = 'rev_content_format';
 405                         $fields[] = 'rev_content_model';
 406                 }
 407
 408                 return $fields;
 409         }
 410
 411         /**
 412          * Return the list of revision fields that should be selected to create
 413          * a new revision from an archive row.
 414          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 415          * @return array
 416          */
 417         public static function selectArchiveFields() {
 418                 global $wgContentHandlerUseDB, $wgActorTableSchemaMigrationStage;
 419                 global $wgMultiContentRevisionSchemaMigrationStage;
 420
 421                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 422                         // If code is using this instead of self::getQueryInfo(), there's a
 423                         // decent chance it's going to try to directly access
 424                         // $row->ar_user or $row->ar_user_text and we can't give it
 425                         // useful values here once those aren't being used anymore.
 426                         throw new BadMethodCallException(
 427                                 'Cannot use ' . __METHOD__
 428                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 429                         );
 430                 }
 431
 432                 if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
 433                         // If code is using this instead of self::getQueryInfo(), there's a
 434                         // decent chance it's going to try to directly access
 435                         // $row->ar_text_id or $row->ar_content_model and we can't give it
 436                         // useful values here once those aren't being written anymore,
 437                         // and may not exist at all.
 438                         throw new BadMethodCallException(
 439                                 'Cannot use ' . __METHOD__ . ' when $wgMultiContentRevisionSchemaMigrationStage '
 440                                 . 'does not have SCHEMA_COMPAT_WRITE_OLD set.'
 441                         );
 442                 }
 443
 444                 wfDeprecated( __METHOD__, '1.31' );
 445
 446                 $fields = [
 447                         'ar_id',
 448                         'ar_page_id',
 449                         'ar_rev_id',
 450                         'ar_text_id',
 451                         'ar_timestamp',
 452                         'ar_user_text',
 453                         'ar_user',
 454                         'ar_actor' => 'NULL',
 455                         'ar_minor_edit',
 456                         'ar_deleted',
 457                         'ar_len',
 458                         'ar_parent_id',
 459                         'ar_sha1',
 460                 ];
 461
 462                 $fields += CommentStore::getStore()->getFields( 'ar_comment' );
 463
 464                 if ( $wgContentHandlerUseDB ) {
 465                         $fields[] = 'ar_content_format';
 466                         $fields[] = 'ar_content_model';
 467                 }
 468                 return $fields;
 469         }
 470
 471         /**
 472          * Return the list of text fields that should be selected to read the
 473          * revision text
 474          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'text' ] ) instead.
 475          * @return array
 476          */
 477         public static function selectTextFields() {
 478                 wfDeprecated( __METHOD__, '1.31' );
 479                 return [
 480                         'old_text',
 481                         'old_flags'
 482                 ];
 483         }
 484
 485         /**
 486          * Return the list of page fields that should be selected from page table
 487          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 488          * @return array
 489          */
 490         public static function selectPageFields() {
 491                 wfDeprecated( __METHOD__, '1.31' );
 492                 return [
 493                         'page_namespace',
 494                         'page_title',
 495                         'page_id',
 496                         'page_latest',
 497                         'page_is_redirect',
 498                         'page_len',
 499                 ];
 500         }
 501
 502         /**
 503          * Return the list of user fields that should be selected from user table
 504          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 505          * @return array
 506          */
 507         public static function selectUserFields() {
 508                 wfDeprecated( __METHOD__, '1.31' );
 509                 return [ 'user_name' ];
 510         }
 511
 512         /**
 513          * Return the tables, fields, and join conditions to be selected to create
 514          * a new revision object.
 515          * @since 1.31
 516          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 517          * @param array $options Any combination of the following strings
 518          *  - 'page': Join with the page table, and select fields to identify the page
 519          *  - 'user': Join with the user table, and select the user name
 520          *  - 'text': Join with the text table, and select fields to load page text
 521          * @return array With three keys:
 522          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 523          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 524          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 525          */
 526         public static function getQueryInfo( $options = [] ) {
 527                 return self::getRevisionStore()->getQueryInfo( $options );
 528         }
 529
 530         /**
 531          * Return the tables, fields, and join conditions to be selected to create
 532          * a new archived revision object.
 533          * @since 1.31
 534          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 535          * @return array With three keys:
 536          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 537          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 538          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 539          */
 540         public static function getArchiveQueryInfo() {
 541                 return self::getRevisionStore()->getArchiveQueryInfo();
 542         }
 543
 544         /**
 545          * Do a batched query to get the parent revision lengths
 546          *
 547          * @deprecated in 1.31, use RevisionStore::getRevisionSizes instead.
 548          *
 549          * @param IDatabase $db
 550          * @param array $revIds
 551          * @return array
 552          */
 553         public static function getParentLengths( $db, array $revIds ) {
 554                 return self::getRevisionStore()->listRevisionSizes( $db, $revIds );
 555         }
 556
 557         /**
 558          * @param object|array|RevisionRecord $row Either a database row or an array
 559          * @param int $queryFlags
 560          * @param Title|null $title
 561          *
 562          * @access private
 563          */
 564         function __construct( $row, $queryFlags = 0, Title $title = null ) {
 565                 global $wgUser;
 566
 567                 if ( $row instanceof RevisionRecord ) {
 568                         $this->mRecord = $row;
 569                 } elseif ( is_array( $row ) ) {
 570                         // If no user is specified, fall back to using the global user object, to stay
 571                         // compatible with pre-1.31 behavior.
 572                         if ( !isset( $row['user'] ) && !isset( $row['user_text'] ) ) {
 573                                 $row['user'] = $wgUser;
 574                         }
 575
 576                         $this->mRecord = self::getRevisionFactory()->newMutableRevisionFromArray(
 577                                 $row,
 578                                 $queryFlags,
 579                                 $this->ensureTitle( $row, $queryFlags, $title )
 580                         );
 581                 } elseif ( is_object( $row ) ) {
 582                         $this->mRecord = self::getRevisionFactory()->newRevisionFromRow(
 583                                 $row,
 584                                 $queryFlags,
 585                                 $this->ensureTitle( $row, $queryFlags, $title )
 586                         );
 587                 } else {
 588                         throw new InvalidArgumentException(
 589                                 '$row must be a row object, an associative array, or a RevisionRecord'
 590                         );
 591                 }
 592         }
 593
 594         /**
 595          * Make sure we have *some* Title object for use by the constructor.
 596          * For B/C, the constructor shouldn't fail even for a bad page ID or bad revision ID.
 597          *
 598          * @param array|object $row
 599          * @param int $queryFlags
 600          * @param Title|null $title
 601          *
 602          * @return Title $title if not null, or a Title constructed from information in $row.
 603          */
 604         private function ensureTitle( $row, $queryFlags, $title = null ) {
 605                 if ( $title ) {
 606                         return $title;
 607                 }
 608
 609                 if ( is_array( $row ) ) {
 610                         if ( isset( $row['title'] ) ) {
 611                                 if ( !( $row['title'] instanceof Title ) ) {
 612                                         throw new MWException( 'title field must contain a Title object.' );
 613                                 }
 614
 615                                 return $row['title'];
 616                         }
 617
 618                         $pageId = $row['page'] ?? 0;
 619                         $revId = $row['id'] ?? 0;
 620                 } else {
 621                         $pageId = $row->rev_page ?? 0;
 622                         $revId = $row->rev_id ?? 0;
 623                 }
 624
 625                 try {
 626                         $title = self::getRevisionStore()->getTitle( $pageId, $revId, $queryFlags );
 627                 } catch ( RevisionAccessException $ex ) {
 628                         // construct a dummy title!
 629                         wfLogWarning( __METHOD__ . ': ' . $ex->getMessage() );
 630
 631                         // NOTE: this Title will only be used inside RevisionRecord
 632                         $title = Title::makeTitleSafe( NS_SPECIAL, "Badtitle/ID=$pageId" );
 633                         $title->resetArticleID( $pageId );
 634                 }
 635
 636                 return $title;
 637         }
 638
 639         /**
 640          * @return RevisionRecord
 641          */
 642         public function getRevisionRecord() {
 643                 return $this->mRecord;
 644         }
 645
 646         /**
 647          * Get revision ID
 648          *
 649          * @return int|null
 650          */
 651         public function getId() {
 652                 return $this->mRecord->getId();
 653         }
 654
 655         /**
 656          * Set the revision ID
 657          *
 658          * This should only be used for proposed revisions that turn out to be null edits.
 659          *
 660          * @note Only supported on Revisions that were constructed based on associative arrays,
 661          *       since they are mutable.
 662          *
 663          * @since 1.19
 664          * @param int|string $id
 665          * @throws MWException
 666          */
 667         public function setId( $id ) {
 668                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 669                         $this->mRecord->setId( intval( $id ) );
 670                 } else {
 671                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 672                 }
 673         }
 674
 675         /**
 676          * Set the user ID/name
 677          *
 678          * This should only be used for proposed revisions that turn out to be null edits
 679          *
 680          * @note Only supported on Revisions that were constructed based on associative arrays,
 681          *       since they are mutable.
 682          *
 683          * @since 1.28
 684          * @deprecated since 1.31, please reuse old Revision object
 685          * @param int $id User ID
 686          * @param string $name User name
 687          * @throws MWException
 688          */
 689         public function setUserIdAndName( $id, $name ) {
 690                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 691                         $user = User::newFromAnyId( intval( $id ), $name, null );
 692                         $this->mRecord->setUser( $user );
 693                 } else {
 694                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 695                 }
 696         }
 697
 698         /**
 699          * @return SlotRecord
 700          */
 701         private function getMainSlotRaw() {
 702                 return $this->mRecord->getSlot( SlotRecord::MAIN, RevisionRecord::RAW );
 703         }
 704
 705         /**
 706          * Get the ID of the row of the text table that contains the content of the
 707          * revision's main slot, if that content is stored in the text table.
 708          *
 709          * If the content is stored elsewhere, this returns null.
 710          *
 711          * @deprecated since 1.31, use RevisionRecord()->getSlot()->getContentAddress() to
 712          * get that actual address that can be used with BlobStore::getBlob(); or use
 713          * RevisionRecord::hasSameContent() to check if two revisions have the same content.
 714          *
 715          * @return int|null
 716          */
 717         public function getTextId() {
 718                 $slot = $this->getMainSlotRaw();
 719                 return $slot->hasAddress()
 720                         ? self::getBlobStore()->getTextIdFromAddress( $slot->getAddress() )
 721                         : null;
 722         }
 723
 724         /**
 725          * Get parent revision ID (the original previous page revision)
 726          *
 727          * @return int|null The ID of the parent revision. 0 indicates that there is no
 728          * parent revision. Null indicates that the parent revision is not known.
 729          */
 730         public function getParentId() {
 731                 return $this->mRecord->getParentId();
 732         }
 733
 734         /**
 735          * Returns the length of the text in this revision, or null if unknown.
 736          *
 737          * @return int|null
 738          */
 739         public function getSize() {
 740                 try {
 741                         return $this->mRecord->getSize();
 742                 } catch ( RevisionAccessException $ex ) {
 743                         return null;
 744                 }
 745         }
 746
 747         /**
 748          * Returns the base36 sha1 of the content in this revision, or null if unknown.
 749          *
 750          * @return string|null
 751          */
 752         public function getSha1() {
 753                 try {
 754                         return $this->mRecord->getSha1();
 755                 } catch ( RevisionAccessException $ex ) {
 756                         return null;
 757                 }
 758         }
 759
 760         /**
 761          * Returns the title of the page associated with this entry.
 762          * Since 1.31, this will never return null.
 763          *
 764          * Will do a query, when title is not set and id is given.
 765          *
 766          * @return Title
 767          */
 768         public function getTitle() {
 769                 $linkTarget = $this->mRecord->getPageAsLinkTarget();
 770                 return Title::newFromLinkTarget( $linkTarget );
 771         }
 772
 773         /**
 774          * Set the title of the revision
 775          *
 776          * @deprecated since 1.31, this is now a noop. Pass the Title to the constructor instead.
 777          *
 778          * @param Title $title
 779          */
 780         public function setTitle( $title ) {
 781                 if ( !$title->equals( $this->getTitle() ) ) {
 782                         throw new InvalidArgumentException(
 783                                 $title->getPrefixedText()
 784                                         . ' is not the same as '
 785                                         . $this->mRecord->getPageAsLinkTarget()->__toString()
 786                         );
 787                 }
 788         }
 789
 790         /**
 791          * Get the page ID
 792          *
 793          * @return int|null
 794          */
 795         public function getPage() {
 796                 return $this->mRecord->getPageId();
 797         }
 798
 799         /**
 800          * Fetch revision's user id if it's available to the specified audience.
 801          * If the specified audience does not have access to it, zero will be
 802          * returned.
 803          *
 804          * @param int $audience One of:
 805          *   Revision::FOR_PUBLIC       to be displayed to all users
 806          *   Revision::FOR_THIS_USER    to be displayed to the given user
 807          *   Revision::RAW              get the ID regardless of permissions
 808          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 809          *   to the $audience parameter
 810          * @return int
 811          */
 812         public function getUser( $audience = self::FOR_PUBLIC, User $user = null ) {
 813                 global $wgUser;
 814
 815                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 816                         $user = $wgUser;
 817                 }
 818
 819                 $user = $this->mRecord->getUser( $audience, $user );
 820                 return $user ? $user->getId() : 0;
 821         }
 822
 823         /**
 824          * Fetch revision's username if it's available to the specified audience.
 825          * If the specified audience does not have access to the username, an
 826          * empty string will be returned.
 827          *
 828          * @param int $audience One of:
 829          *   Revision::FOR_PUBLIC       to be displayed to all users
 830          *   Revision::FOR_THIS_USER    to be displayed to the given user
 831          *   Revision::RAW              get the text regardless of permissions
 832          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 833          *   to the $audience parameter
 834          * @return string
 835          */
 836         public function getUserText( $audience = self::FOR_PUBLIC, User $user = null ) {
 837                 global $wgUser;
 838
 839                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 840                         $user = $wgUser;
 841                 }
 842
 843                 $user = $this->mRecord->getUser( $audience, $user );
 844                 return $user ? $user->getName() : '';
 845         }
 846         /**
 847          * Fetch revision comment if it's available to the specified audience.
 848          * If the specified audience does not have access to the comment, an
 849          * empty string will be returned.
 850          *
 851          * @param int $audience One of:
 852          *   Revision::FOR_PUBLIC       to be displayed to all users
 853          *   Revision::FOR_THIS_USER    to be displayed to the given user
 854          *   Revision::RAW              get the text regardless of permissions
 855          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 856          *   to the $audience parameter
 857          * @return string
 858          */
 859         function getComment( $audience = self::FOR_PUBLIC, User $user = null ) {
 860                 global $wgUser;
 861
 862                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 863                         $user = $wgUser;
 864                 }
 865
 866                 $comment = $this->mRecord->getComment( $audience, $user );
 867                 return $comment === null ? null : $comment->text;
 868         }
 869
 870         /**
 871          * @return bool
 872          */
 873         public function isMinor() {
 874                 return $this->mRecord->isMinor();
 875         }
 876
 877         /**
 878          * @return int Rcid of the unpatrolled row, zero if there isn't one
 879          */
 880         public function isUnpatrolled() {
 881                 return self::getRevisionStore()->getRcIdIfUnpatrolled( $this->mRecord );
 882         }
 883
 884         /**
 885          * Get the RC object belonging to the current revision, if there's one
 886          *
 887          * @param int $flags (optional) $flags include:
 888          *      Revision::READ_LATEST  : Select the data from the master
 889          *
 890          * @since 1.22
 891          * @return RecentChange|null
 892          */
 893         public function getRecentChange( $flags = 0 ) {
 894                 return self::getRevisionStore()->getRecentChange( $this->mRecord, $flags );
 895         }
 896
 897         /**
 898          * @param int $field One of DELETED_* bitfield constants
 899          *
 900          * @return bool
 901          */
 902         public function isDeleted( $field ) {
 903                 return $this->mRecord->isDeleted( $field );
 904         }
 905
 906         /**
 907          * Get the deletion bitfield of the revision
 908          *
 909          * @return int
 910          */
 911         public function getVisibility() {
 912                 return $this->mRecord->getVisibility();
 913         }
 914
 915         /**
 916          * Fetch revision content if it's available to the specified audience.
 917          * If the specified audience does not have the ability to view this
 918          * revision, or the content could not be loaded, null will be returned.
 919          *
 920          * @param int $audience One of:
 921          *   Revision::FOR_PUBLIC       to be displayed to all users
 922          *   Revision::FOR_THIS_USER    to be displayed to $user
 923          *   Revision::RAW              get the text regardless of permissions
 924          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 925          *   to the $audience parameter
 926          * @since 1.21
 927          * @return Content|null
 928          */
 929         public function getContent( $audience = self::FOR_PUBLIC, User $user = null ) {
 930                 global $wgUser;
 931
 932                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 933                         $user = $wgUser;
 934                 }
 935
 936                 try {
 937                         return $this->mRecord->getContent( SlotRecord::MAIN, $audience, $user );
 938                 }
 939                 catch ( RevisionAccessException $e ) {
 940                         return null;
 941                 }
 942         }
 943
 944         /**
 945          * Get original serialized data (without checking view restrictions)
 946          *
 947          * @since 1.21
 948          * @deprecated since 1.31, use BlobStore::getBlob instead.
 949          *
 950          * @return string
 951          */
 952         public function getSerializedData() {
 953                 $slot = $this->getMainSlotRaw();
 954                 return $slot->getContent()->serialize();
 955         }
 956
 957         /**
 958          * Returns the content model for the main slot of this revision.
 959          *
 960          * If no content model was stored in the database, the default content model for the title is
 961          * used to determine the content model to use. If no title is know, CONTENT_MODEL_WIKITEXT
 962          * is used as a last resort.
 963          *
 964          * @todo drop this, with MCR, there no longer is a single model associated with a revision.
 965          *
 966          * @return string The content model id associated with this revision,
 967          *     see the CONTENT_MODEL_XXX constants.
 968          */
 969         public function getContentModel() {
 970                 return $this->getMainSlotRaw()->getModel();
 971         }
 972
 973         /**
 974          * Returns the content format for the main slot of this revision.
 975          *
 976          * If no content format was stored in the database, the default format for this
 977          * revision's content model is returned.
 978          *
 979          * @todo drop this, the format is irrelevant to the revision!
 980          *
 981          * @return string The content format id associated with this revision,
 982          *     see the CONTENT_FORMAT_XXX constants.
 983          */
 984         public function getContentFormat() {
 985                 $format = $this->getMainSlotRaw()->getFormat();
 986
 987                 if ( $format === null ) {
 988                         // if no format was stored along with the blob, fall back to default format
 989                         $format = $this->getContentHandler()->getDefaultFormat();
 990                 }
 991
 992                 return $format;
 993         }
 994
 995         /**
 996          * Returns the content handler appropriate for this revision's content model.
 997          *
 998          * @throws MWException
 999          * @return ContentHandler
1000          */
1001         public function getContentHandler() {
1002                 return ContentHandler::getForModelID( $this->getContentModel() );
1003         }
1004
1005         /**
1006          * @return string
1007          */
1008         public function getTimestamp() {
1009                 return $this->mRecord->getTimestamp();
1010         }
1011
1012         /**
1013          * @return bool
1014          */
1015         public function isCurrent() {
1016                 return ( $this->mRecord instanceof RevisionStoreRecord ) && $this->mRecord->isCurrent();
1017         }
1018
1019         /**
1020          * Get previous revision for this title
1021          *
1022          * @return Revision|null
1023          */
1024         public function getPrevious() {
1025                 $title = $this->getTitle();
1026                 $rec = self::getRevisionLookup()->getPreviousRevision( $this->mRecord, $title );
1027                 return $rec === null ? null : new Revision( $rec, self::READ_NORMAL, $title );
1028         }
1029
1030         /**
1031          * Get next revision for this title
1032          *
1033          * @return Revision|null
1034          */
1035         public function getNext() {
1036                 $title = $this->getTitle();
1037                 $rec = self::getRevisionLookup()->getNextRevision( $this->mRecord, $title );
1038                 return $rec === null ? null : new Revision( $rec, self::READ_NORMAL, $title );
1039         }
1040
1041         /**
1042          * Get revision text associated with an old or archive row
1043          *
1044          * If the text field is not included, this uses RevisionStore to load the appropriate slot
1045          * and return its serialized content. This is the default backwards-compatibility behavior
1046          * when reading from the MCR aware database schema is enabled. For this to work, either
1047          * the revision ID or the page ID must be included in the row.
1048          *
1049          * When using the old text field, the flags field must also be set. Including the old_id
1050          * field will activate cache usage as long as the $wiki parameter is not set.
1051          *
1052          * @deprecated since 1.32, use RevisionStore::newRevisionFromRow instead.
1053          *
1054          * @param stdClass $row The text data. If a falsy value is passed instead, false is returned.
1055          * @param string $prefix Table prefix (default 'old_')
1056          * @param string|bool $wiki The name of the wiki to load the revision text from
1057          *   (same as the wiki $row was loaded from) or false to indicate the local
1058          *   wiki (this is the default). Otherwise, it must be a symbolic wiki database
1059          *   identifier as understood by the LoadBalancer class.
1060          * @return string|false Text the text requested or false on failure
1061          */
1062         public static function getRevisionText( $row, $prefix = 'old_', $wiki = false ) {
1063                 global $wgMultiContentRevisionSchemaMigrationStage;
1064
1065                 if ( !$row ) {
1066                         return false;
1067                 }
1068
1069                 $textField = $prefix . 'text';
1070                 $flagsField = $prefix . 'flags';
1071
1072                 if ( isset( $row->$textField ) ) {
1073                         if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
1074                                 // The text field was read, but it's no longer being populated!
1075                                 // We could gloss over this by using the text when it's there and loading
1076                                 // if when it's not, but it seems preferable to complain loudly about a
1077                                 // query that is no longer guaranteed to work reliably.
1078                                 throw new LogicException(
1079                                         'Cannot use ' . __METHOD__ . ' with the ' . $textField . ' field when'
1080                                         . ' $wgMultiContentRevisionSchemaMigrationStage does not include'
1081                                         . ' SCHEMA_COMPAT_WRITE_OLD. The field may not be populated for all revisions!'
1082                                 );
1083                         }
1084
1085                         $text = $row->$textField;
1086                 } else {
1087                         // Missing text field, we are probably looking at the MCR-enabled DB schema.
1088
1089                         if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
1090                                 // This method should no longer be used with the new schema. Ideally, we
1091                                 // would already trigger a deprecation warning when SCHEMA_COMPAT_READ_NEW is set.
1092                                 wfDeprecated( __METHOD__ . ' (MCR without SCHEMA_COMPAT_WRITE_OLD)', '1.32' );
1093                         }
1094
1095                         $store = self::getRevisionStore( $wiki );
1096                         $rev = $prefix === 'ar_'
1097                                 ? $store->newRevisionFromArchiveRow( $row )
1098                                 : $store->newRevisionFromRow( $row );
1099
1100                         $content = $rev->getContent( SlotRecord::MAIN );
1101                         return $content ? $content->serialize() : false;
1102                 }
1103
1104                 if ( isset( $row->$flagsField ) ) {
1105                         $flags = explode( ',', $row->$flagsField );
1106                 } else {
1107                         $flags = [];
1108                 }
1109
1110                 $cacheKey = isset( $row->old_id )
1111                         ? SqlBlobStore::makeAddressFromTextId( $row->old_id )
1112                         : null;
1113
1114                 $revisionText = self::getBlobStore( $wiki )->expandBlob( $text, $flags, $cacheKey );
1115
1116                 if ( $revisionText === false ) {
1117                         if ( isset( $row->old_id ) ) {
1118                                 wfLogWarning( __METHOD__ . ": Bad data in text row {$row->old_id}! " );
1119                         } else {
1120                                 wfLogWarning( __METHOD__ . ": Bad data in text row! " );
1121                         }
1122                         return false;
1123                 }
1124
1125                 return $revisionText;
1126         }
1127
1128         /**
1129          * If $wgCompressRevisions is enabled, we will compress data.
1130          * The input string is modified in place.
1131          * Return value is the flags field: contains 'gzip' if the
1132          * data is compressed, and 'utf-8' if we're saving in UTF-8
1133          * mode.
1134          *
1135          * @param mixed &$text Reference to a text
1136          * @return string
1137          */
1138         public static function compressRevisionText( &$text ) {
1139                 return self::getBlobStore()->compressData( $text );
1140         }
1141
1142         /**
1143          * Re-converts revision text according to it's flags.
1144          *
1145          * @param mixed $text Reference to a text
1146          * @param array $flags Compression flags
1147          * @return string|bool Decompressed text, or false on failure
1148          */
1149         public static function decompressRevisionText( $text, $flags ) {
1150                 if ( $text === false ) {
1151                         // Text failed to be fetched; nothing to do
1152                         return false;
1153                 }
1154
1155                 return self::getBlobStore()->decompressData( $text, $flags );
1156         }
1157
1158         /**
1159          * Insert a new revision into the database, returning the new revision ID
1160          * number on success and dies horribly on failure.
1161          *
1162          * @param IDatabase $dbw (master connection)
1163          * @throws MWException
1164          * @return int The revision ID
1165          */
1166         public function insertOn( $dbw ) {
1167                 global $wgUser;
1168
1169                 // Note that $this->mRecord->getId() will typically return null here, but not always,
1170                 // e.g. not when restoring a revision.
1171
1172                 if ( $this->mRecord->getUser( RevisionRecord::RAW ) === null ) {
1173                         if ( $this->mRecord instanceof MutableRevisionRecord ) {
1174                                 $this->mRecord->setUser( $wgUser );
1175                         } else {
1176                                 throw new MWException( 'Cannot insert revision with no associated user.' );
1177                         }
1178                 }
1179
1180                 $rec = self::getRevisionStore()->insertRevisionOn( $this->mRecord, $dbw );
1181
1182                 $this->mRecord = $rec;
1183
1184                 // Avoid PHP 7.1 warning of passing $this by reference
1185                 $revision = $this;
1186
1187                 return $rec->getId();
1188         }
1189
1190         /**
1191          * Get the base 36 SHA-1 value for a string of text
1192          * @param string $text
1193          * @return string
1194          */
1195         public static function base36Sha1( $text ) {
1196                 return SlotRecord::base36Sha1( $text );
1197         }
1198
1199         /**
1200          * Create a new null-revision for insertion into a page's
1201          * history. This will not re-save the text, but simply refer
1202          * to the text from the previous version.
1203          *
1204          * Such revisions can for instance identify page rename
1205          * operations and other such meta-modifications.
1206          *
1207          * @param IDatabase $dbw
1208          * @param int $pageId ID number of the page to read from
1209          * @param string $summary Revision's summary
1210          * @param bool $minor Whether the revision should be considered as minor
1211          * @param User|null $user User object to use or null for $wgUser
1212          * @return Revision|null Revision or null on error
1213          */
1214         public static function newNullRevision( $dbw, $pageId, $summary, $minor, $user = null ) {
1215                 global $wgUser;
1216                 if ( !$user ) {
1217                         $user = $wgUser;
1218                 }
1219
1220                 $comment = CommentStoreComment::newUnsavedComment( $summary, null );
1221
1222                 $title = Title::newFromID( $pageId, Title::GAID_FOR_UPDATE );
1223                 if ( $title === null ) {
1224                         return null;
1225                 }
1226
1227                 $rec = self::getRevisionStore()->newNullRevision( $dbw, $title, $comment, $minor, $user );
1228
1229                 return $rec ? new Revision( $rec ) : null;
1230         }
1231
1232         /**
1233          * Determine if the current user is allowed to view a particular
1234          * field of this revision, if it's marked as deleted.
1235          *
1236          * @param int $field One of self::DELETED_TEXT,
1237          *                              self::DELETED_COMMENT,
1238          *                              self::DELETED_USER
1239          * @param User|null $user User object to check, or null to use $wgUser
1240          * @return bool
1241          */
1242         public function userCan( $field, User $user = null ) {
1243                 return self::userCanBitfield( $this->getVisibility(), $field, $user );
1244         }
1245
1246         /**
1247          * Determine if the current user is allowed to view a particular
1248          * field of this revision, if it's marked as deleted. This is used
1249          * by various classes to avoid duplication.
1250          *
1251          * @param int $bitfield Current field
1252          * @param int $field One of self::DELETED_TEXT = File::DELETED_FILE,
1253          *                               self::DELETED_COMMENT = File::DELETED_COMMENT,
1254          *                               self::DELETED_USER = File::DELETED_USER
1255          * @param User|null $user User object to check, or null to use $wgUser
1256          * @param Title|null $title A Title object to check for per-page restrictions on,
1257          *                          instead of just plain userrights
1258          * @return bool
1259          */
1260         public static function userCanBitfield( $bitfield, $field, User $user = null,
1261                 Title $title = null
1262         ) {
1263                 global $wgUser;
1264
1265                 if ( !$user ) {
1266                         $user = $wgUser;
1267                 }
1268
1269                 return RevisionRecord::userCanBitfield( $bitfield, $field, $user, $title );
1270         }
1271
1272         /**
1273          * Get rev_timestamp from rev_id, without loading the rest of the row
1274          *
1275          * @param Title $title
1276          * @param int $id
1277          * @param int $flags
1278          * @return string|bool False if not found
1279          */
1280         static function getTimestampFromId( $title, $id, $flags = 0 ) {
1281                 return self::getRevisionStore()->getTimestampFromId( $title, $id, $flags );
1282         }
1283
1284         /**
1285          * Get count of revisions per page...not very efficient
1286          *
1287          * @param IDatabase $db
1288          * @param int $id Page id
1289          * @return int
1290          */
1291         static function countByPageId( $db, $id ) {
1292                 return self::getRevisionStore()->countRevisionsByPageId( $db, $id );
1293         }
1294
1295         /**
1296          * Get count of revisions per page...not very efficient
1297          *
1298          * @param IDatabase $db
1299          * @param Title $title
1300          * @return int
1301          */
1302         static function countByTitle( $db, $title ) {
1303                 return self::getRevisionStore()->countRevisionsByTitle( $db, $title );
1304         }
1305
1306         /**
1307          * Check if no edits were made by other users since
1308          * the time a user started editing the page. Limit to
1309          * 50 revisions for the sake of performance.
1310          *
1311          * @since 1.20
1312          * @deprecated since 1.24
1313          *
1314          * @param IDatabase|int $db The Database to perform the check on. May be given as a
1315          *        Database object or a database identifier usable with wfGetDB.
1316          * @param int $pageId The ID of the page in question
1317          * @param int $userId The ID of the user in question
1318          * @param string $since Look at edits since this time
1319          *
1320          * @return bool True if the given user was the only one to edit since the given timestamp
1321          */
1322         public static function userWasLastToEdit( $db, $pageId, $userId, $since ) {
1323                 if ( is_int( $db ) ) {
1324                         $db = wfGetDB( $db );
1325                 }
1326
1327                 return self::getRevisionStore()->userWasLastToEdit( $db, $pageId, $userId, $since );
1328         }
1329
1330         /**
1331          * Load a revision based on a known page ID and current revision ID from the DB
1332          *
1333          * This method allows for the use of caching, though accessing anything that normally
1334          * requires permission checks (aside from the text) will trigger a small DB lookup.
1335          * The title will also be loaded if $pageIdOrTitle is an integer ID.
1336          *
1337          * @param IDatabase $db ignored!
1338          * @param int|Title $pageIdOrTitle Page ID or Title object
1339          * @param int $revId Known current revision of this page. Determined automatically if not given.
1340          * @return Revision|bool Returns false if missing
1341          * @since 1.28
1342          */
1343         public static function newKnownCurrent( IDatabase $db, $pageIdOrTitle, $revId = 0 ) {
1344                 $title = $pageIdOrTitle instanceof Title
1345                         ? $pageIdOrTitle
1346                         : Title::newFromID( $pageIdOrTitle );
1347
1348                 if ( !$title ) {
1349                         return false;
1350                 }
1351
1352                 $record = self::getRevisionLookup()->getKnownCurrentRevision( $title, $revId );
1353                 return $record ? new Revision( $record ) : false;
1354         }
1355 }