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