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\Assert\Assert;
  33 use Wikimedia\Rdbms\IDatabase;
  34 use MediaWiki\Linker\LinkTarget;
  35 use MediaWiki\MediaWikiServices;
  36
  37 /**
  38  * @deprecated since 1.31, use RevisionRecord, RevisionStore, and BlobStore instead.
  39  */
  40 class Revision implements IDBAccessObject {
  41
  42         /** @var RevisionRecord */
  43         protected $mRecord;
  44
  45         // Revision deletion constants
  46         const DELETED_TEXT = RevisionRecord::DELETED_TEXT;
  47         const DELETED_COMMENT = RevisionRecord::DELETED_COMMENT;
  48         const DELETED_USER = RevisionRecord::DELETED_USER;
  49         const DELETED_RESTRICTED = RevisionRecord::DELETED_RESTRICTED;
  50         const SUPPRESSED_USER = RevisionRecord::SUPPRESSED_USER;
  51         const SUPPRESSED_ALL = RevisionRecord::SUPPRESSED_ALL;
  52
  53         // Audience options for accessors
  54         const FOR_PUBLIC = RevisionRecord::FOR_PUBLIC;
  55         const FOR_THIS_USER = RevisionRecord::FOR_THIS_USER;
  56         const RAW = RevisionRecord::RAW;
  57
  58         const TEXT_CACHE_GROUP = SqlBlobStore::TEXT_CACHE_GROUP;
  59
  60         /**
  61          * @return RevisionStore
  62          */
  63         protected static function getRevisionStore( $wiki = false ) {
  64                 if ( $wiki ) {
  65                         return MediaWikiServices::getInstance()->getRevisionStoreFactory()
  66                                 ->getRevisionStore( $wiki );
  67                 } else {
  68                         return MediaWikiServices::getInstance()->getRevisionStore();
  69                 }
  70         }
  71
  72         /**
  73          * @return RevisionLookup
  74          */
  75         protected static function getRevisionLookup() {
  76                 return MediaWikiServices::getInstance()->getRevisionLookup();
  77         }
  78
  79         /**
  80          * @return RevisionFactory
  81          */
  82         protected static function getRevisionFactory() {
  83                 return MediaWikiServices::getInstance()->getRevisionFactory();
  84         }
  85
  86         /**
  87          * @param bool|string $wiki The ID of the target wiki database. Use false for the local wiki.
  88          *
  89          * @return SqlBlobStore
  90          */
  91         protected static function getBlobStore( $wiki = false ) {
  92                 // @phan-suppress-next-line PhanAccessMethodInternal
  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 ? new Revision( $rec, $flags ) : null;
 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 ? new Revision( $rec, $flags ) : null;
 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 ? new Revision( $rec, $flags ) : null;
 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 ? new Revision( $rec ) : null;
 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 ? new Revision( $rec ) : null;
 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 ? new Revision( $rec ) : null;
 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 ? new Revision( $rec ) : null;
 299         }
 300
 301         /**
 302          * Return the value of a select() JOIN conds array for the user table.
 303          * This will get user table rows for logged-in users.
 304          * @since 1.19
 305          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 306          * @return array
 307          */
 308         public static function userJoinCond() {
 309                 global $wgActorTableSchemaMigrationStage;
 310
 311                 wfDeprecated( __METHOD__, '1.31' );
 312                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 313                         // If code is using this instead of self::getQueryInfo(), there's
 314                         // no way the join it's trying to do can work once the old fields
 315                         // aren't being used anymore.
 316                         throw new BadMethodCallException(
 317                                 'Cannot use ' . __METHOD__
 318                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 319                         );
 320                 }
 321
 322                 return [ 'LEFT JOIN', [ 'rev_user != 0', 'user_id = rev_user' ] ];
 323         }
 324
 325         /**
 326          * Return the value of a select() page conds array for the page table.
 327          * This will assure that the revision(s) are not orphaned from live pages.
 328          * @since 1.19
 329          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 330          * @return array
 331          */
 332         public static function pageJoinCond() {
 333                 wfDeprecated( __METHOD__, '1.31' );
 334                 return [ 'JOIN', [ 'page_id = rev_page' ] ];
 335         }
 336
 337         /**
 338          * Return the list of revision fields that should be selected to create
 339          * a new revision.
 340          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 341          * @return array
 342          */
 343         public static function selectFields() {
 344                 global $wgContentHandlerUseDB, $wgActorTableSchemaMigrationStage;
 345                 global $wgMultiContentRevisionSchemaMigrationStage;
 346
 347                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 348                         // If code is using this instead of self::getQueryInfo(), there's a
 349                         // decent chance it's going to try to directly access
 350                         // $row->rev_user or $row->rev_user_text and we can't give it
 351                         // useful values here once those aren't being used anymore.
 352                         throw new BadMethodCallException(
 353                                 'Cannot use ' . __METHOD__
 354                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 355                         );
 356                 }
 357
 358                 if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
 359                         // If code is using this instead of self::getQueryInfo(), there's a
 360                         // decent chance it's going to try to directly access
 361                         // $row->rev_text_id or $row->rev_content_model and we can't give it
 362                         // useful values here once those aren't being written anymore,
 363                         // and may not exist at all.
 364                         throw new BadMethodCallException(
 365                                 'Cannot use ' . __METHOD__ . ' when $wgMultiContentRevisionSchemaMigrationStage '
 366                                 . 'does not have SCHEMA_COMPAT_WRITE_OLD set.'
 367                         );
 368                 }
 369
 370                 wfDeprecated( __METHOD__, '1.31' );
 371
 372                 $fields = [
 373                         'rev_id',
 374                         'rev_page',
 375                         'rev_text_id',
 376                         'rev_timestamp',
 377                         'rev_user_text',
 378                         'rev_user',
 379                         'rev_actor' => 'NULL',
 380                         'rev_minor_edit',
 381                         'rev_deleted',
 382                         'rev_len',
 383                         'rev_parent_id',
 384                         'rev_sha1',
 385                 ];
 386
 387                 $fields += CommentStore::getStore()->getFields( 'rev_comment' );
 388
 389                 if ( $wgContentHandlerUseDB ) {
 390                         $fields[] = 'rev_content_format';
 391                         $fields[] = 'rev_content_model';
 392                 }
 393
 394                 return $fields;
 395         }
 396
 397         /**
 398          * Return the list of revision fields that should be selected to create
 399          * a new revision from an archive row.
 400          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 401          * @return array
 402          */
 403         public static function selectArchiveFields() {
 404                 global $wgContentHandlerUseDB, $wgActorTableSchemaMigrationStage;
 405                 global $wgMultiContentRevisionSchemaMigrationStage;
 406
 407                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 408                         // If code is using this instead of self::getQueryInfo(), there's a
 409                         // decent chance it's going to try to directly access
 410                         // $row->ar_user or $row->ar_user_text and we can't give it
 411                         // useful values here once those aren't being used anymore.
 412                         throw new BadMethodCallException(
 413                                 'Cannot use ' . __METHOD__
 414                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 415                         );
 416                 }
 417
 418                 if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
 419                         // If code is using this instead of self::getQueryInfo(), there's a
 420                         // decent chance it's going to try to directly access
 421                         // $row->ar_text_id or $row->ar_content_model and we can't give it
 422                         // useful values here once those aren't being written anymore,
 423                         // and may not exist at all.
 424                         throw new BadMethodCallException(
 425                                 'Cannot use ' . __METHOD__ . ' when $wgMultiContentRevisionSchemaMigrationStage '
 426                                 . 'does not have SCHEMA_COMPAT_WRITE_OLD set.'
 427                         );
 428                 }
 429
 430                 wfDeprecated( __METHOD__, '1.31' );
 431
 432                 $fields = [
 433                         'ar_id',
 434                         'ar_page_id',
 435                         'ar_rev_id',
 436                         'ar_text_id',
 437                         'ar_timestamp',
 438                         'ar_user_text',
 439                         'ar_user',
 440                         'ar_actor' => 'NULL',
 441                         'ar_minor_edit',
 442                         'ar_deleted',
 443                         'ar_len',
 444                         'ar_parent_id',
 445                         'ar_sha1',
 446                 ];
 447
 448                 $fields += CommentStore::getStore()->getFields( 'ar_comment' );
 449
 450                 if ( $wgContentHandlerUseDB ) {
 451                         $fields[] = 'ar_content_format';
 452                         $fields[] = 'ar_content_model';
 453                 }
 454                 return $fields;
 455         }
 456
 457         /**
 458          * Return the list of text fields that should be selected to read the
 459          * revision text
 460          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'text' ] ) instead.
 461          * @return array
 462          */
 463         public static function selectTextFields() {
 464                 wfDeprecated( __METHOD__, '1.31' );
 465                 return [
 466                         'old_text',
 467                         'old_flags'
 468                 ];
 469         }
 470
 471         /**
 472          * Return the list of page fields that should be selected from page table
 473          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 474          * @return array
 475          */
 476         public static function selectPageFields() {
 477                 wfDeprecated( __METHOD__, '1.31' );
 478                 return [
 479                         'page_namespace',
 480                         'page_title',
 481                         'page_id',
 482                         'page_latest',
 483                         'page_is_redirect',
 484                         'page_len',
 485                 ];
 486         }
 487
 488         /**
 489          * Return the list of user fields that should be selected from user table
 490          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 491          * @return array
 492          */
 493         public static function selectUserFields() {
 494                 wfDeprecated( __METHOD__, '1.31' );
 495                 return [ 'user_name' ];
 496         }
 497
 498         /**
 499          * Return the tables, fields, and join conditions to be selected to create
 500          * a new revision object.
 501          * @since 1.31
 502          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 503          * @param array $options Any combination of the following strings
 504          *  - 'page': Join with the page table, and select fields to identify the page
 505          *  - 'user': Join with the user table, and select the user name
 506          *  - 'text': Join with the text table, and select fields to load page text
 507          * @return array With three keys:
 508          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 509          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 510          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 511          */
 512         public static function getQueryInfo( $options = [] ) {
 513                 return self::getRevisionStore()->getQueryInfo( $options );
 514         }
 515
 516         /**
 517          * Return the tables, fields, and join conditions to be selected to create
 518          * a new archived revision object.
 519          * @since 1.31
 520          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 521          * @return array With three keys:
 522          *   - tables: (string[]) to include in the `$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 getArchiveQueryInfo() {
 527                 return self::getRevisionStore()->getArchiveQueryInfo();
 528         }
 529
 530         /**
 531          * Do a batched query to get the parent revision lengths
 532          *
 533          * @deprecated in 1.31, use RevisionStore::getRevisionSizes instead.
 534          *
 535          * @param IDatabase $db
 536          * @param array $revIds
 537          * @return array
 538          */
 539         public static function getParentLengths( $db, array $revIds ) {
 540                 return self::getRevisionStore()->listRevisionSizes( $db, $revIds );
 541         }
 542
 543         /**
 544          * @param object|array|RevisionRecord $row Either a database row or an array
 545          * @param int $queryFlags
 546          * @param Title|null $title
 547          *
 548          * @private
 549          */
 550         function __construct( $row, $queryFlags = 0, Title $title = null ) {
 551                 global $wgUser;
 552
 553                 if ( $row instanceof RevisionRecord ) {
 554                         $this->mRecord = $row;
 555                 } elseif ( is_array( $row ) ) {
 556                         // If no user is specified, fall back to using the global user object, to stay
 557                         // compatible with pre-1.31 behavior.
 558                         if ( !isset( $row['user'] ) && !isset( $row['user_text'] ) ) {
 559                                 $row['user'] = $wgUser;
 560                         }
 561
 562                         $this->mRecord = self::getRevisionFactory()->newMutableRevisionFromArray(
 563                                 $row,
 564                                 $queryFlags,
 565                                 $this->ensureTitle( $row, $queryFlags, $title )
 566                         );
 567                 } elseif ( is_object( $row ) ) {
 568                         $this->mRecord = self::getRevisionFactory()->newRevisionFromRow(
 569                                 $row,
 570                                 $queryFlags,
 571                                 $this->ensureTitle( $row, $queryFlags, $title )
 572                         );
 573                 } else {
 574                         throw new InvalidArgumentException(
 575                                 '$row must be a row object, an associative array, or a RevisionRecord'
 576                         );
 577                 }
 578
 579                 Assert::postcondition( $this->mRecord !== null, 'Failed to construct a RevisionRecord' );
 580         }
 581
 582         /**
 583          * Make sure we have *some* Title object for use by the constructor.
 584          * For B/C, the constructor shouldn't fail even for a bad page ID or bad revision ID.
 585          *
 586          * @param array|object $row
 587          * @param int $queryFlags
 588          * @param Title|null $title
 589          *
 590          * @return Title $title if not null, or a Title constructed from information in $row.
 591          */
 592         private function ensureTitle( $row, $queryFlags, $title = null ) {
 593                 if ( $title ) {
 594                         return $title;
 595                 }
 596
 597                 if ( is_array( $row ) ) {
 598                         if ( isset( $row['title'] ) ) {
 599                                 if ( !( $row['title'] instanceof Title ) ) {
 600                                         throw new MWException( 'title field must contain a Title object.' );
 601                                 }
 602
 603                                 return $row['title'];
 604                         }
 605
 606                         $pageId = $row['page'] ?? 0;
 607                         $revId = $row['id'] ?? 0;
 608                 } else {
 609                         $pageId = $row->rev_page ?? 0;
 610                         $revId = $row->rev_id ?? 0;
 611                 }
 612
 613                 try {
 614                         $title = self::getRevisionStore()->getTitle( $pageId, $revId, $queryFlags );
 615                 } catch ( RevisionAccessException $ex ) {
 616                         // construct a dummy title!
 617                         wfLogWarning( __METHOD__ . ': ' . $ex->getMessage() );
 618
 619                         // NOTE: this Title will only be used inside RevisionRecord
 620                         $title = Title::makeTitleSafe( NS_SPECIAL, "Badtitle/ID=$pageId" );
 621                         $title->resetArticleID( $pageId );
 622                 }
 623
 624                 return $title;
 625         }
 626
 627         /**
 628          * @return RevisionRecord
 629          */
 630         public function getRevisionRecord() {
 631                 return $this->mRecord;
 632         }
 633
 634         /**
 635          * Get revision ID
 636          *
 637          * @return int|null
 638          */
 639         public function getId() {
 640                 return $this->mRecord->getId();
 641         }
 642
 643         /**
 644          * Set the revision ID
 645          *
 646          * This should only be used for proposed revisions that turn out to be null edits.
 647          *
 648          * @note Only supported on Revisions that were constructed based on associative arrays,
 649          *       since they are mutable.
 650          *
 651          * @since 1.19
 652          * @param int|string $id
 653          * @throws MWException
 654          */
 655         public function setId( $id ) {
 656                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 657                         $this->mRecord->setId( intval( $id ) );
 658                 } else {
 659                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 660                 }
 661         }
 662
 663         /**
 664          * Set the user ID/name
 665          *
 666          * This should only be used for proposed revisions that turn out to be null edits
 667          *
 668          * @note Only supported on Revisions that were constructed based on associative arrays,
 669          *       since they are mutable.
 670          *
 671          * @since 1.28
 672          * @deprecated since 1.31, please reuse old Revision object
 673          * @param int $id User ID
 674          * @param string $name User name
 675          * @throws MWException
 676          */
 677         public function setUserIdAndName( $id, $name ) {
 678                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 679                         $user = User::newFromAnyId( intval( $id ), $name, null );
 680                         $this->mRecord->setUser( $user );
 681                 } else {
 682                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 683                 }
 684         }
 685
 686         /**
 687          * @return SlotRecord
 688          */
 689         private function getMainSlotRaw() {
 690                 return $this->mRecord->getSlot( SlotRecord::MAIN, RevisionRecord::RAW );
 691         }
 692
 693         /**
 694          * Get the ID of the row of the text table that contains the content of the
 695          * revision's main slot, if that content is stored in the text table.
 696          *
 697          * If the content is stored elsewhere, this returns null.
 698          *
 699          * @deprecated since 1.31, use RevisionRecord()->getSlot()->getContentAddress() to
 700          * get that actual address that can be used with BlobStore::getBlob(); or use
 701          * RevisionRecord::hasSameContent() to check if two revisions have the same content.
 702          *
 703          * @return int|null
 704          */
 705         public function getTextId() {
 706                 $slot = $this->getMainSlotRaw();
 707                 return $slot->hasAddress()
 708                         ? self::getBlobStore()->getTextIdFromAddress( $slot->getAddress() )
 709                         : null;
 710         }
 711
 712         /**
 713          * Get parent revision ID (the original previous page revision)
 714          *
 715          * @return int|null The ID of the parent revision. 0 indicates that there is no
 716          * parent revision. Null indicates that the parent revision is not known.
 717          */
 718         public function getParentId() {
 719                 return $this->mRecord->getParentId();
 720         }
 721
 722         /**
 723          * Returns the length of the text in this revision, or null if unknown.
 724          *
 725          * @return int|null
 726          */
 727         public function getSize() {
 728                 try {
 729                         return $this->mRecord->getSize();
 730                 } catch ( RevisionAccessException $ex ) {
 731                         return null;
 732                 }
 733         }
 734
 735         /**
 736          * Returns the base36 sha1 of the content in this revision, or null if unknown.
 737          *
 738          * @return string|null
 739          */
 740         public function getSha1() {
 741                 try {
 742                         return $this->mRecord->getSha1();
 743                 } catch ( RevisionAccessException $ex ) {
 744                         return null;
 745                 }
 746         }
 747
 748         /**
 749          * Returns the title of the page associated with this entry.
 750          * Since 1.31, this will never return null.
 751          *
 752          * Will do a query, when title is not set and id is given.
 753          *
 754          * @return Title
 755          */
 756         public function getTitle() {
 757                 $linkTarget = $this->mRecord->getPageAsLinkTarget();
 758                 return Title::newFromLinkTarget( $linkTarget );
 759         }
 760
 761         /**
 762          * Set the title of the revision
 763          *
 764          * @deprecated since 1.31, this is now a noop. Pass the Title to the constructor instead.
 765          *
 766          * @param Title $title
 767          */
 768         public function setTitle( $title ) {
 769                 if ( !$title->equals( $this->getTitle() ) ) {
 770                         throw new InvalidArgumentException(
 771                                 $title->getPrefixedText()
 772                                         . ' is not the same as '
 773                                         . $this->mRecord->getPageAsLinkTarget()->__toString()
 774                         );
 775                 }
 776         }
 777
 778         /**
 779          * Get the page ID
 780          *
 781          * @return int|null
 782          */
 783         public function getPage() {
 784                 return $this->mRecord->getPageId();
 785         }
 786
 787         /**
 788          * Fetch revision's user id if it's available to the specified audience.
 789          * If the specified audience does not have access to it, zero will be
 790          * returned.
 791          *
 792          * @param int $audience One of:
 793          *   Revision::FOR_PUBLIC       to be displayed to all users
 794          *   Revision::FOR_THIS_USER    to be displayed to the given user
 795          *   Revision::RAW              get the ID regardless of permissions
 796          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 797          *   to the $audience parameter
 798          * @return int
 799          */
 800         public function getUser( $audience = self::FOR_PUBLIC, User $user = null ) {
 801                 global $wgUser;
 802
 803                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 804                         $user = $wgUser;
 805                 }
 806
 807                 $user = $this->mRecord->getUser( $audience, $user );
 808                 return $user ? $user->getId() : 0;
 809         }
 810
 811         /**
 812          * Fetch revision's username if it's available to the specified audience.
 813          * If the specified audience does not have access to the username, an
 814          * empty string will be returned.
 815          *
 816          * @param int $audience One of:
 817          *   Revision::FOR_PUBLIC       to be displayed to all users
 818          *   Revision::FOR_THIS_USER    to be displayed to the given user
 819          *   Revision::RAW              get the text regardless of permissions
 820          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 821          *   to the $audience parameter
 822          * @return string
 823          */
 824         public function getUserText( $audience = self::FOR_PUBLIC, User $user = null ) {
 825                 global $wgUser;
 826
 827                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 828                         $user = $wgUser;
 829                 }
 830
 831                 $user = $this->mRecord->getUser( $audience, $user );
 832                 return $user ? $user->getName() : '';
 833         }
 834
 835         /**
 836          * @param int $audience One of:
 837          *   Revision::FOR_PUBLIC       to be displayed to all users
 838          *   Revision::FOR_THIS_USER    to be displayed to the given user
 839          *   Revision::RAW              get the text regardless of permissions
 840          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 841          *   to the $audience parameter
 842          *
 843          * @return string|null Returns null if the specified audience does not have access to the
 844          *  comment.
 845          */
 846         function getComment( $audience = self::FOR_PUBLIC, User $user = null ) {
 847                 global $wgUser;
 848
 849                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 850                         $user = $wgUser;
 851                 }
 852
 853                 $comment = $this->mRecord->getComment( $audience, $user );
 854                 return $comment === null ? null : $comment->text;
 855         }
 856
 857         /**
 858          * @return bool
 859          */
 860         public function isMinor() {
 861                 return $this->mRecord->isMinor();
 862         }
 863
 864         /**
 865          * @return int Rcid of the unpatrolled row, zero if there isn't one
 866          */
 867         public function isUnpatrolled() {
 868                 return self::getRevisionStore()->getRcIdIfUnpatrolled( $this->mRecord );
 869         }
 870
 871         /**
 872          * Get the RC object belonging to the current revision, if there's one
 873          *
 874          * @param int $flags (optional) $flags include:
 875          *      Revision::READ_LATEST  : Select the data from the master
 876          *
 877          * @since 1.22
 878          * @return RecentChange|null
 879          */
 880         public function getRecentChange( $flags = 0 ) {
 881                 return self::getRevisionStore()->getRecentChange( $this->mRecord, $flags );
 882         }
 883
 884         /**
 885          * @param int $field One of DELETED_* bitfield constants
 886          *
 887          * @return bool
 888          */
 889         public function isDeleted( $field ) {
 890                 return $this->mRecord->isDeleted( $field );
 891         }
 892
 893         /**
 894          * Get the deletion bitfield of the revision
 895          *
 896          * @return int
 897          */
 898         public function getVisibility() {
 899                 return $this->mRecord->getVisibility();
 900         }
 901
 902         /**
 903          * Fetch revision content if it's available to the specified audience.
 904          * If the specified audience does not have the ability to view this
 905          * revision, or the content could not be loaded, null will be returned.
 906          *
 907          * @param int $audience One of:
 908          *   Revision::FOR_PUBLIC       to be displayed to all users
 909          *   Revision::FOR_THIS_USER    to be displayed to $user
 910          *   Revision::RAW              get the text regardless of permissions
 911          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 912          *   to the $audience parameter
 913          * @since 1.21
 914          * @return Content|null
 915          */
 916         public function getContent( $audience = self::FOR_PUBLIC, User $user = null ) {
 917                 global $wgUser;
 918
 919                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 920                         $user = $wgUser;
 921                 }
 922
 923                 try {
 924                         return $this->mRecord->getContent( SlotRecord::MAIN, $audience, $user );
 925                 }
 926                 catch ( RevisionAccessException $e ) {
 927                         return null;
 928                 }
 929         }
 930
 931         /**
 932          * Get original serialized data (without checking view restrictions)
 933          *
 934          * @since 1.21
 935          * @deprecated since 1.31, use BlobStore::getBlob instead.
 936          *
 937          * @return string
 938          */
 939         public function getSerializedData() {
 940                 $slot = $this->getMainSlotRaw();
 941                 return $slot->getContent()->serialize();
 942         }
 943
 944         /**
 945          * Returns the content model for the main slot of this revision.
 946          *
 947          * If no content model was stored in the database, the default content model for the title is
 948          * used to determine the content model to use. If no title is know, CONTENT_MODEL_WIKITEXT
 949          * is used as a last resort.
 950          *
 951          * @todo drop this, with MCR, there no longer is a single model associated with a revision.
 952          *
 953          * @return string The content model id associated with this revision,
 954          *     see the CONTENT_MODEL_XXX constants.
 955          */
 956         public function getContentModel() {
 957                 return $this->getMainSlotRaw()->getModel();
 958         }
 959
 960         /**
 961          * Returns the content format for the main slot of this revision.
 962          *
 963          * If no content format was stored in the database, the default format for this
 964          * revision's content model is returned.
 965          *
 966          * @todo drop this, the format is irrelevant to the revision!
 967          *
 968          * @return string The content format id associated with this revision,
 969          *     see the CONTENT_FORMAT_XXX constants.
 970          */
 971         public function getContentFormat() {
 972                 $format = $this->getMainSlotRaw()->getFormat();
 973
 974                 if ( $format === null ) {
 975                         // if no format was stored along with the blob, fall back to default format
 976                         $format = $this->getContentHandler()->getDefaultFormat();
 977                 }
 978
 979                 return $format;
 980         }
 981
 982         /**
 983          * Returns the content handler appropriate for this revision's content model.
 984          *
 985          * @throws MWException
 986          * @return ContentHandler
 987          */
 988         public function getContentHandler() {
 989                 return ContentHandler::getForModelID( $this->getContentModel() );
 990         }
 991
 992         /**
 993          * @return string
 994          */
 995         public function getTimestamp() {
 996                 return $this->mRecord->getTimestamp();
 997         }
 998
 999         /**
1000          * @return bool
1001          */
1002         public function isCurrent() {
1003                 return ( $this->mRecord instanceof RevisionStoreRecord ) && $this->mRecord->isCurrent();
1004         }
1005
1006         /**
1007          * Get previous revision for this title
1008          *
1009          * @return Revision|null
1010          */
1011         public function getPrevious() {
1012                 $rec = self::getRevisionLookup()->getPreviousRevision( $this->mRecord );
1013                 return $rec ? new Revision( $rec, self::READ_NORMAL, $this->getTitle() ) : null;
1014         }
1015
1016         /**
1017          * Get next revision for this title
1018          *
1019          * @return Revision|null
1020          */
1021         public function getNext() {
1022                 $rec = self::getRevisionLookup()->getNextRevision( $this->mRecord );
1023                 return $rec ? new Revision( $rec, self::READ_NORMAL, $this->getTitle() ) : null;
1024         }
1025
1026         /**
1027          * Get revision text associated with an old or archive row
1028          *
1029          * If the text field is not included, this uses RevisionStore to load the appropriate slot
1030          * and return its serialized content. This is the default backwards-compatibility behavior
1031          * when reading from the MCR aware database schema is enabled. For this to work, either
1032          * the revision ID or the page ID must be included in the row.
1033          *
1034          * When using the old text field, the flags field must also be set. Including the old_id
1035          * field will activate cache usage as long as the $wiki parameter is not set.
1036          *
1037          * @deprecated since 1.32, use RevisionStore::newRevisionFromRow instead.
1038          *
1039          * @param stdClass $row The text data. If a falsy value is passed instead, false is returned.
1040          * @param string $prefix Table prefix (default 'old_')
1041          * @param string|bool $wiki The name of the wiki to load the revision text from
1042          *   (same as the wiki $row was loaded from) or false to indicate the local
1043          *   wiki (this is the default). Otherwise, it must be a symbolic wiki database
1044          *   identifier as understood by the LoadBalancer class.
1045          * @return string|false Text the text requested or false on failure
1046          */
1047         public static function getRevisionText( $row, $prefix = 'old_', $wiki = false ) {
1048                 global $wgMultiContentRevisionSchemaMigrationStage;
1049
1050                 if ( !$row ) {
1051                         return false;
1052                 }
1053
1054                 $textField = $prefix . 'text';
1055                 $flagsField = $prefix . 'flags';
1056
1057                 if ( isset( $row->$textField ) ) {
1058                         if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
1059                                 // The text field was read, but it's no longer being populated!
1060                                 // We could gloss over this by using the text when it's there and loading
1061                                 // if when it's not, but it seems preferable to complain loudly about a
1062                                 // query that is no longer guaranteed to work reliably.
1063                                 throw new LogicException(
1064                                         'Cannot use ' . __METHOD__ . ' with the ' . $textField . ' field when'
1065                                         . ' $wgMultiContentRevisionSchemaMigrationStage does not include'
1066                                         . ' SCHEMA_COMPAT_WRITE_OLD. The field may not be populated for all revisions!'
1067                                 );
1068                         }
1069
1070                         $text = $row->$textField;
1071                 } else {
1072                         // Missing text field, we are probably looking at the MCR-enabled DB schema.
1073
1074                         if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
1075                                 // This method should no longer be used with the new schema. Ideally, we
1076                                 // would already trigger a deprecation warning when SCHEMA_COMPAT_READ_NEW is set.
1077                                 wfDeprecated( __METHOD__ . ' (MCR without SCHEMA_COMPAT_WRITE_OLD)', '1.32' );
1078                         }
1079
1080                         $store = self::getRevisionStore( $wiki );
1081                         $rev = $prefix === 'ar_'
1082                                 ? $store->newRevisionFromArchiveRow( $row )
1083                                 : $store->newRevisionFromRow( $row );
1084
1085                         $content = $rev->getContent( SlotRecord::MAIN );
1086                         return $content ? $content->serialize() : false;
1087                 }
1088
1089                 if ( isset( $row->$flagsField ) ) {
1090                         $flags = explode( ',', $row->$flagsField );
1091                 } else {
1092                         $flags = [];
1093                 }
1094
1095                 $cacheKey = isset( $row->old_id )
1096                         ? SqlBlobStore::makeAddressFromTextId( $row->old_id )
1097                         : null;
1098
1099                 $revisionText = self::getBlobStore( $wiki )->expandBlob( $text, $flags, $cacheKey );
1100
1101                 if ( $revisionText === false ) {
1102                         if ( isset( $row->old_id ) ) {
1103                                 wfLogWarning( __METHOD__ . ": Bad data in text row {$row->old_id}! " );
1104                         } else {
1105                                 wfLogWarning( __METHOD__ . ": Bad data in text row! " );
1106                         }
1107                         return false;
1108                 }
1109
1110                 return $revisionText;
1111         }
1112
1113         /**
1114          * If $wgCompressRevisions is enabled, we will compress data.
1115          * The input string is modified in place.
1116          * Return value is the flags field: contains 'gzip' if the
1117          * data is compressed, and 'utf-8' if we're saving in UTF-8
1118          * mode.
1119          *
1120          * @param mixed &$text Reference to a text
1121          * @return string
1122          */
1123         public static function compressRevisionText( &$text ) {
1124                 return self::getBlobStore()->compressData( $text );
1125         }
1126
1127         /**
1128          * Re-converts revision text according to it's flags.
1129          *
1130          * @param mixed $text Reference to a text
1131          * @param array $flags Compression flags
1132          * @return string|bool Decompressed text, or false on failure
1133          */
1134         public static function decompressRevisionText( $text, $flags ) {
1135                 if ( $text === false ) {
1136                         // Text failed to be fetched; nothing to do
1137                         return false;
1138                 }
1139
1140                 return self::getBlobStore()->decompressData( $text, $flags );
1141         }
1142
1143         /**
1144          * Insert a new revision into the database, returning the new revision ID
1145          * number on success and dies horribly on failure.
1146          *
1147          * @param IDatabase $dbw (master connection)
1148          * @throws MWException
1149          * @return int The revision ID
1150          */
1151         public function insertOn( $dbw ) {
1152                 global $wgUser;
1153
1154                 // Note that $this->mRecord->getId() will typically return null here, but not always,
1155                 // e.g. not when restoring a revision.
1156
1157                 if ( $this->mRecord->getUser( RevisionRecord::RAW ) === null ) {
1158                         if ( $this->mRecord instanceof MutableRevisionRecord ) {
1159                                 $this->mRecord->setUser( $wgUser );
1160                         } else {
1161                                 throw new MWException( 'Cannot insert revision with no associated user.' );
1162                         }
1163                 }
1164
1165                 $rec = self::getRevisionStore()->insertRevisionOn( $this->mRecord, $dbw );
1166
1167                 $this->mRecord = $rec;
1168                 Assert::postcondition( $this->mRecord !== null, 'Failed to acquire a RevisionRecord' );
1169
1170                 return $rec->getId();
1171         }
1172
1173         /**
1174          * Get the base 36 SHA-1 value for a string of text
1175          * @param string $text
1176          * @return string
1177          */
1178         public static function base36Sha1( $text ) {
1179                 return SlotRecord::base36Sha1( $text );
1180         }
1181
1182         /**
1183          * Create a new null-revision for insertion into a page's
1184          * history. This will not re-save the text, but simply refer
1185          * to the text from the previous version.
1186          *
1187          * Such revisions can for instance identify page rename
1188          * operations and other such meta-modifications.
1189          *
1190          * @param IDatabase $dbw
1191          * @param int $pageId ID number of the page to read from
1192          * @param string $summary Revision's summary
1193          * @param bool $minor Whether the revision should be considered as minor
1194          * @param User|null $user User object to use or null for $wgUser
1195          * @return Revision|null Revision or null on error
1196          */
1197         public static function newNullRevision( $dbw, $pageId, $summary, $minor, $user = null ) {
1198                 global $wgUser;
1199                 if ( !$user ) {
1200                         $user = $wgUser;
1201                 }
1202
1203                 $comment = CommentStoreComment::newUnsavedComment( $summary, null );
1204
1205                 $title = Title::newFromID( $pageId, Title::GAID_FOR_UPDATE );
1206                 if ( $title === null ) {
1207                         return null;
1208                 }
1209
1210                 $rec = self::getRevisionStore()->newNullRevision( $dbw, $title, $comment, $minor, $user );
1211
1212                 return $rec ? new Revision( $rec ) : null;
1213         }
1214
1215         /**
1216          * Determine if the current user is allowed to view a particular
1217          * field of this revision, if it's marked as deleted.
1218          *
1219          * @param int $field One of self::DELETED_TEXT,
1220          *                              self::DELETED_COMMENT,
1221          *                              self::DELETED_USER
1222          * @param User|null $user User object to check, or null to use $wgUser
1223          * @return bool
1224          */
1225         public function userCan( $field, User $user = null ) {
1226                 return self::userCanBitfield( $this->getVisibility(), $field, $user );
1227         }
1228
1229         /**
1230          * Determine if the current user is allowed to view a particular
1231          * field of this revision, if it's marked as deleted. This is used
1232          * by various classes to avoid duplication.
1233          *
1234          * @param int $bitfield Current field
1235          * @param int $field One of self::DELETED_TEXT = File::DELETED_FILE,
1236          *                               self::DELETED_COMMENT = File::DELETED_COMMENT,
1237          *                               self::DELETED_USER = File::DELETED_USER
1238          * @param User|null $user User object to check, or null to use $wgUser
1239          * @param Title|null $title A Title object to check for per-page restrictions on,
1240          *                          instead of just plain userrights
1241          * @return bool
1242          */
1243         public static function userCanBitfield( $bitfield, $field, User $user = null,
1244                 Title $title = null
1245         ) {
1246                 global $wgUser;
1247
1248                 if ( !$user ) {
1249                         $user = $wgUser;
1250                 }
1251
1252                 return RevisionRecord::userCanBitfield( $bitfield, $field, $user, $title );
1253         }
1254
1255         /**
1256          * Get rev_timestamp from rev_id, without loading the rest of the row
1257          *
1258          * @param Title $title (ignored since 1.34)
1259          * @param int $id
1260          * @param int $flags
1261          * @return string|bool False if not found
1262          */
1263         static function getTimestampFromId( $title, $id, $flags = 0 ) {
1264                 return self::getRevisionStore()->getTimestampFromId( $id, $flags );
1265         }
1266
1267         /**
1268          * Get count of revisions per page...not very efficient
1269          *
1270          * @param IDatabase $db
1271          * @param int $id Page id
1272          * @return int
1273          */
1274         static function countByPageId( $db, $id ) {
1275                 return self::getRevisionStore()->countRevisionsByPageId( $db, $id );
1276         }
1277
1278         /**
1279          * Get count of revisions per page...not very efficient
1280          *
1281          * @param IDatabase $db
1282          * @param Title $title
1283          * @return int
1284          */
1285         static function countByTitle( $db, $title ) {
1286                 return self::getRevisionStore()->countRevisionsByTitle( $db, $title );
1287         }
1288
1289         /**
1290          * Check if no edits were made by other users since
1291          * the time a user started editing the page. Limit to
1292          * 50 revisions for the sake of performance.
1293          *
1294          * @since 1.20
1295          * @deprecated since 1.24
1296          *
1297          * @param IDatabase|int $db The Database to perform the check on. May be given as a
1298          *        Database object or a database identifier usable with wfGetDB.
1299          * @param int $pageId The ID of the page in question
1300          * @param int $userId The ID of the user in question
1301          * @param string $since Look at edits since this time
1302          *
1303          * @return bool True if the given user was the only one to edit since the given timestamp
1304          */
1305         public static function userWasLastToEdit( $db, $pageId, $userId, $since ) {
1306                 if ( is_int( $db ) ) {
1307                         $db = wfGetDB( $db );
1308                 }
1309
1310                 return self::getRevisionStore()->userWasLastToEdit( $db, $pageId, $userId, $since );
1311         }
1312
1313         /**
1314          * Load a revision based on a known page ID and current revision ID from the DB
1315          *
1316          * This method allows for the use of caching, though accessing anything that normally
1317          * requires permission checks (aside from the text) will trigger a small DB lookup.
1318          * The title will also be loaded if $pageIdOrTitle is an integer ID.
1319          *
1320          * @param IDatabase $db ignored!
1321          * @param int|Title $pageIdOrTitle Page ID or Title object
1322          * @param int $revId Known current revision of this page. Determined automatically if not given.
1323          * @return Revision|bool Returns false if missing
1324          * @since 1.28
1325          */
1326         public static function newKnownCurrent( IDatabase $db, $pageIdOrTitle, $revId = 0 ) {
1327                 $title = $pageIdOrTitle instanceof Title
1328                         ? $pageIdOrTitle
1329                         : Title::newFromID( $pageIdOrTitle );
1330
1331                 if ( !$title ) {
1332                         return false;
1333                 }
1334
1335                 $record = self::getRevisionLookup()->getKnownCurrentRevision( $title, $revId );
1336                 return $record ? new Revision( $record ) : false;
1337         }
1338 }