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 use Wikimedia\Rdbms\ResultWrapper;
  37 use Wikimedia\Rdbms\FakeResultWrapper;
  38
  39 /**
  40  * @deprecated since 1.31, use RevisionRecord, RevisionStore, and BlobStore instead.
  41  */
  42 class Revision implements IDBAccessObject {
  43
  44         /** @var RevisionRecord */
  45         protected $mRecord;
  46
  47         // Revision deletion constants
  48         const DELETED_TEXT = RevisionRecord::DELETED_TEXT;
  49         const DELETED_COMMENT = RevisionRecord::DELETED_COMMENT;
  50         const DELETED_USER = RevisionRecord::DELETED_USER;
  51         const DELETED_RESTRICTED = RevisionRecord::DELETED_RESTRICTED;
  52         const SUPPRESSED_USER = RevisionRecord::SUPPRESSED_USER;
  53         const SUPPRESSED_ALL = RevisionRecord::SUPPRESSED_ALL;
  54
  55         // Audience options for accessors
  56         const FOR_PUBLIC = RevisionRecord::FOR_PUBLIC;
  57         const FOR_THIS_USER = RevisionRecord::FOR_THIS_USER;
  58         const RAW = RevisionRecord::RAW;
  59
  60         const TEXT_CACHE_GROUP = SqlBlobStore::TEXT_CACHE_GROUP;
  61
  62         /**
  63          * @return RevisionStore
  64          */
  65         protected static function getRevisionStore( $wiki = false ) {
  66                 if ( $wiki ) {
  67                         return MediaWikiServices::getInstance()->getRevisionStoreFactory()
  68                                 ->getRevisionStore( $wiki );
  69                 } else {
  70                         return MediaWikiServices::getInstance()->getRevisionStore();
  71                 }
  72         }
  73
  74         /**
  75          * @return RevisionLookup
  76          */
  77         protected static function getRevisionLookup() {
  78                 return MediaWikiServices::getInstance()->getRevisionLookup();
  79         }
  80
  81         /**
  82          * @return RevisionFactory
  83          */
  84         protected static function getRevisionFactory() {
  85                 return MediaWikiServices::getInstance()->getRevisionFactory();
  86         }
  87
  88         /**
  89          * @param bool|string $wiki The ID of the target wiki database. Use false for the local wiki.
  90          *
  91          * @return SqlBlobStore
  92          */
  93         protected static function getBlobStore( $wiki = false ) {
  94                 $store = MediaWikiServices::getInstance()
  95                         ->getBlobStoreFactory()
  96                         ->newSqlBlobStore( $wiki );
  97
  98                 if ( !$store instanceof SqlBlobStore ) {
  99                         throw new RuntimeException(
 100                                 'The backwards compatibility code in Revision currently requires the BlobStore '
 101                                 . 'service to be an SqlBlobStore instance, but it is a ' . get_class( $store )
 102                         );
 103                 }
 104
 105                 return $store;
 106         }
 107
 108         /**
 109          * Load a page revision from a given revision ID number.
 110          * Returns null if no such revision can be found.
 111          *
 112          * $flags include:
 113          *      Revision::READ_LATEST  : Select the data from the master
 114          *      Revision::READ_LOCKING : Select & lock the data from the master
 115          *
 116          * @param int $id
 117          * @param int $flags (optional)
 118          * @return Revision|null
 119          */
 120         public static function newFromId( $id, $flags = 0 ) {
 121                 $rec = self::getRevisionLookup()->getRevisionById( $id, $flags );
 122                 return $rec === null ? null : new Revision( $rec, $flags );
 123         }
 124
 125         /**
 126          * Load either the current, or a specified, revision
 127          * that's attached to a given link target. If not attached
 128          * to that link target, will return null.
 129          *
 130          * $flags include:
 131          *      Revision::READ_LATEST  : Select the data from the master
 132          *      Revision::READ_LOCKING : Select & lock the data from the master
 133          *
 134          * @param LinkTarget $linkTarget
 135          * @param int $id (optional)
 136          * @param int $flags Bitfield (optional)
 137          * @return Revision|null
 138          */
 139         public static function newFromTitle( LinkTarget $linkTarget, $id = 0, $flags = 0 ) {
 140                 $rec = self::getRevisionLookup()->getRevisionByTitle( $linkTarget, $id, $flags );
 141                 return $rec === null ? null : new Revision( $rec, $flags );
 142         }
 143
 144         /**
 145          * Load either the current, or a specified, revision
 146          * that's attached to a given page ID.
 147          * Returns null if no such revision can be found.
 148          *
 149          * $flags include:
 150          *      Revision::READ_LATEST  : Select the data from the master (since 1.20)
 151          *      Revision::READ_LOCKING : Select & lock the data from the master
 152          *
 153          * @param int $pageId
 154          * @param int $revId (optional)
 155          * @param int $flags Bitfield (optional)
 156          * @return Revision|null
 157          */
 158         public static function newFromPageId( $pageId, $revId = 0, $flags = 0 ) {
 159                 $rec = self::getRevisionLookup()->getRevisionByPageId( $pageId, $revId, $flags );
 160                 return $rec === null ? null : new Revision( $rec, $flags );
 161         }
 162
 163         /**
 164          * Make a fake revision object from an archive table row. This is queried
 165          * for permissions or even inserted (as in Special:Undelete)
 166          *
 167          * @param object $row
 168          * @param array $overrides
 169          *
 170          * @throws MWException
 171          * @return Revision
 172          */
 173         public static function newFromArchiveRow( $row, $overrides = [] ) {
 174                 /**
 175                  * MCR Migration: https://phabricator.wikimedia.org/T183564
 176                  * This method used to overwrite attributes, then passed to Revision::__construct
 177                  * RevisionStore::newRevisionFromArchiveRow instead overrides row field names
 178                  * So do a conversion here.
 179                  */
 180                 if ( array_key_exists( 'page', $overrides ) ) {
 181                         $overrides['page_id'] = $overrides['page'];
 182                         unset( $overrides['page'] );
 183                 }
 184
 185                 /**
 186                  * We require a Title for both the Revision object and the RevisionRecord.
 187                  * Below is duplicated logic from RevisionStore::newRevisionFromArchiveRow
 188                  * to fetch a title in order pass it into the Revision object.
 189                  */
 190                 $title = null;
 191                 if ( isset( $overrides['title'] ) ) {
 192                         if ( !( $overrides['title'] instanceof Title ) ) {
 193                                 throw new MWException( 'title field override must contain a Title object.' );
 194                         }
 195
 196                         $title = $overrides['title'];
 197                 }
 198                 if ( $title !== null ) {
 199                         if ( isset( $row->ar_namespace ) && isset( $row->ar_title ) ) {
 200                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 201                         } else {
 202                                 throw new InvalidArgumentException(
 203                                         'A Title or ar_namespace and ar_title must be given'
 204                                 );
 205                         }
 206                 }
 207
 208                 $rec = self::getRevisionFactory()->newRevisionFromArchiveRow( $row, 0, $title, $overrides );
 209                 return new Revision( $rec, self::READ_NORMAL, $title );
 210         }
 211
 212         /**
 213          * @since 1.19
 214          *
 215          * MCR migration note: replaced by RevisionStore::newRevisionFromRow(). Note that
 216          * newFromRow() also accepts arrays, while newRevisionFromRow() does not. Instead,
 217          * a MutableRevisionRecord should be constructed directly.
 218          * RevisionStore::newMutableRevisionFromArray() can be used as a temporary replacement,
 219          * but should be avoided.
 220          *
 221          * @param object|array $row
 222          * @return Revision
 223          */
 224         public static function newFromRow( $row ) {
 225                 if ( is_array( $row ) ) {
 226                         $rec = self::getRevisionFactory()->newMutableRevisionFromArray( $row );
 227                 } else {
 228                         $rec = self::getRevisionFactory()->newRevisionFromRow( $row );
 229                 }
 230
 231                 return new Revision( $rec );
 232         }
 233
 234         /**
 235          * Load a page revision from a given revision ID number.
 236          * Returns null if no such revision can be found.
 237          *
 238          * @deprecated since 1.31, use RevisionStore::getRevisionById() instead.
 239          *
 240          * @param IDatabase $db
 241          * @param int $id
 242          * @return Revision|null
 243          */
 244         public static function loadFromId( $db, $id ) {
 245                 wfDeprecated( __METHOD__, '1.31' ); // no known callers
 246                 $rec = self::getRevisionStore()->loadRevisionFromId( $db, $id );
 247                 return $rec === null ? null : new Revision( $rec );
 248         }
 249
 250         /**
 251          * Load either the current, or a specified, revision
 252          * that's attached to a given page. If not attached
 253          * to that page, will return null.
 254          *
 255          * @deprecated since 1.31, use RevisionStore::getRevisionByPageId() instead.
 256          *
 257          * @param IDatabase $db
 258          * @param int $pageid
 259          * @param int $id
 260          * @return Revision|null
 261          */
 262         public static function loadFromPageId( $db, $pageid, $id = 0 ) {
 263                 $rec = self::getRevisionStore()->loadRevisionFromPageId( $db, $pageid, $id );
 264                 return $rec === null ? null : new Revision( $rec );
 265         }
 266
 267         /**
 268          * Load either the current, or a specified, revision
 269          * that's attached to a given page. If not attached
 270          * to that page, will return null.
 271          *
 272          * @deprecated since 1.31, use RevisionStore::getRevisionByTitle() instead.
 273          *
 274          * @param IDatabase $db
 275          * @param Title $title
 276          * @param int $id
 277          * @return Revision|null
 278          */
 279         public static function loadFromTitle( $db, $title, $id = 0 ) {
 280                 $rec = self::getRevisionStore()->loadRevisionFromTitle( $db, $title, $id );
 281                 return $rec === null ? null : new Revision( $rec );
 282         }
 283
 284         /**
 285          * Load the revision for the given title with the given timestamp.
 286          * WARNING: Timestamps may in some circumstances not be unique,
 287          * so this isn't the best key to use.
 288          *
 289          * @deprecated since 1.31, use RevisionStore::getRevisionByTimestamp()
 290          *   or RevisionStore::loadRevisionFromTimestamp() instead.
 291          *
 292          * @param IDatabase $db
 293          * @param Title $title
 294          * @param string $timestamp
 295          * @return Revision|null
 296          */
 297         public static function loadFromTimestamp( $db, $title, $timestamp ) {
 298                 $rec = self::getRevisionStore()->loadRevisionFromTimestamp( $db, $title, $timestamp );
 299                 return $rec === null ? null : new Revision( $rec );
 300         }
 301
 302         /**
 303          * Return a wrapper for a series of database rows to
 304          * fetch all of a given page's revisions in turn.
 305          * Each row can be fed to the constructor to get objects.
 306          *
 307          * @param LinkTarget $title
 308          * @return ResultWrapper
 309          * @deprecated Since 1.28, no callers in core nor in known extensions. No-op since 1.31.
 310          */
 311         public static function fetchRevision( LinkTarget $title ) {
 312                 wfDeprecated( __METHOD__, '1.31' );
 313                 return new FakeResultWrapper( [] );
 314         }
 315
 316         /**
 317          * Return the value of a select() JOIN conds array for the user table.
 318          * This will get user table rows for logged-in users.
 319          * @since 1.19
 320          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 321          * @return array
 322          */
 323         public static function userJoinCond() {
 324                 global $wgActorTableSchemaMigrationStage;
 325
 326                 wfDeprecated( __METHOD__, '1.31' );
 327                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 328                         // If code is using this instead of self::getQueryInfo(), there's
 329                         // no way the join it's trying to do can work once the old fields
 330                         // aren't being used anymore.
 331                         throw new BadMethodCallException(
 332                                 'Cannot use ' . __METHOD__
 333                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 334                         );
 335                 }
 336
 337                 return [ 'LEFT JOIN', [ 'rev_user != 0', 'user_id = rev_user' ] ];
 338         }
 339
 340         /**
 341          * Return the value of a select() page conds array for the page table.
 342          * This will assure that the revision(s) are not orphaned from live pages.
 343          * @since 1.19
 344          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 345          * @return array
 346          */
 347         public static function pageJoinCond() {
 348                 wfDeprecated( __METHOD__, '1.31' );
 349                 return [ 'INNER JOIN', [ 'page_id = rev_page' ] ];
 350         }
 351
 352         /**
 353          * Return the list of revision fields that should be selected to create
 354          * a new revision.
 355          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 356          * @return array
 357          */
 358         public static function selectFields() {
 359                 global $wgContentHandlerUseDB, $wgActorTableSchemaMigrationStage;
 360                 global $wgMultiContentRevisionSchemaMigrationStage;
 361
 362                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 363                         // If code is using this instead of self::getQueryInfo(), there's a
 364                         // decent chance it's going to try to directly access
 365                         // $row->rev_user or $row->rev_user_text and we can't give it
 366                         // useful values here once those aren't being used anymore.
 367                         throw new BadMethodCallException(
 368                                 'Cannot use ' . __METHOD__
 369                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 370                         );
 371                 }
 372
 373                 if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
 374                         // If code is using this instead of self::getQueryInfo(), there's a
 375                         // decent chance it's going to try to directly access
 376                         // $row->rev_text_id or $row->rev_content_model and we can't give it
 377                         // useful values here once those aren't being written anymore,
 378                         // and may not exist at all.
 379                         throw new BadMethodCallException(
 380                                 'Cannot use ' . __METHOD__ . ' when $wgMultiContentRevisionSchemaMigrationStage '
 381                                 . 'does not have SCHEMA_COMPAT_WRITE_OLD set.'
 382                         );
 383                 }
 384
 385                 wfDeprecated( __METHOD__, '1.31' );
 386
 387                 $fields = [
 388                         'rev_id',
 389                         'rev_page',
 390                         'rev_text_id',
 391                         'rev_timestamp',
 392                         'rev_user_text',
 393                         'rev_user',
 394                         'rev_actor' => 'NULL',
 395                         'rev_minor_edit',
 396                         'rev_deleted',
 397                         'rev_len',
 398                         'rev_parent_id',
 399                         'rev_sha1',
 400                 ];
 401
 402                 $fields += CommentStore::getStore()->getFields( 'rev_comment' );
 403
 404                 if ( $wgContentHandlerUseDB ) {
 405                         $fields[] = 'rev_content_format';
 406                         $fields[] = 'rev_content_model';
 407                 }
 408
 409                 return $fields;
 410         }
 411
 412         /**
 413          * Return the list of revision fields that should be selected to create
 414          * a new revision from an archive row.
 415          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 416          * @return array
 417          */
 418         public static function selectArchiveFields() {
 419                 global $wgContentHandlerUseDB, $wgActorTableSchemaMigrationStage;
 420                 global $wgMultiContentRevisionSchemaMigrationStage;
 421
 422                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 423                         // If code is using this instead of self::getQueryInfo(), there's a
 424                         // decent chance it's going to try to directly access
 425                         // $row->ar_user or $row->ar_user_text and we can't give it
 426                         // useful values here once those aren't being used anymore.
 427                         throw new BadMethodCallException(
 428                                 'Cannot use ' . __METHOD__
 429                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 430                         );
 431                 }
 432
 433                 if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
 434                         // If code is using this instead of self::getQueryInfo(), there's a
 435                         // decent chance it's going to try to directly access
 436                         // $row->ar_text_id or $row->ar_content_model and we can't give it
 437                         // useful values here once those aren't being written anymore,
 438                         // and may not exist at all.
 439                         throw new BadMethodCallException(
 440                                 'Cannot use ' . __METHOD__ . ' when $wgMultiContentRevisionSchemaMigrationStage '
 441                                 . 'does not have SCHEMA_COMPAT_WRITE_OLD set.'
 442                         );
 443                 }
 444
 445                 wfDeprecated( __METHOD__, '1.31' );
 446
 447                 $fields = [
 448                         'ar_id',
 449                         'ar_page_id',
 450                         'ar_rev_id',
 451                         'ar_text_id',
 452                         'ar_timestamp',
 453                         'ar_user_text',
 454                         'ar_user',
 455                         'ar_actor' => 'NULL',
 456                         'ar_minor_edit',
 457                         'ar_deleted',
 458                         'ar_len',
 459                         'ar_parent_id',
 460                         'ar_sha1',
 461                 ];
 462
 463                 $fields += CommentStore::getStore()->getFields( 'ar_comment' );
 464
 465                 if ( $wgContentHandlerUseDB ) {
 466                         $fields[] = 'ar_content_format';
 467                         $fields[] = 'ar_content_model';
 468                 }
 469                 return $fields;
 470         }
 471
 472         /**
 473          * Return the list of text fields that should be selected to read the
 474          * revision text
 475          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'text' ] ) instead.
 476          * @return array
 477          */
 478         public static function selectTextFields() {
 479                 wfDeprecated( __METHOD__, '1.31' );
 480                 return [
 481                         'old_text',
 482                         'old_flags'
 483                 ];
 484         }
 485
 486         /**
 487          * Return the list of page fields that should be selected from page table
 488          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 489          * @return array
 490          */
 491         public static function selectPageFields() {
 492                 wfDeprecated( __METHOD__, '1.31' );
 493                 return [
 494                         'page_namespace',
 495                         'page_title',
 496                         'page_id',
 497                         'page_latest',
 498                         'page_is_redirect',
 499                         'page_len',
 500                 ];
 501         }
 502
 503         /**
 504          * Return the list of user fields that should be selected from user table
 505          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 506          * @return array
 507          */
 508         public static function selectUserFields() {
 509                 wfDeprecated( __METHOD__, '1.31' );
 510                 return [ 'user_name' ];
 511         }
 512
 513         /**
 514          * Return the tables, fields, and join conditions to be selected to create
 515          * a new revision object.
 516          * @since 1.31
 517          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 518          * @param array $options Any combination of the following strings
 519          *  - 'page': Join with the page table, and select fields to identify the page
 520          *  - 'user': Join with the user table, and select the user name
 521          *  - 'text': Join with the text table, and select fields to load page text
 522          * @return array With three keys:
 523          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 524          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 525          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 526          */
 527         public static function getQueryInfo( $options = [] ) {
 528                 return self::getRevisionStore()->getQueryInfo( $options );
 529         }
 530
 531         /**
 532          * Return the tables, fields, and join conditions to be selected to create
 533          * a new archived revision object.
 534          * @since 1.31
 535          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 536          * @return array With three keys:
 537          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 538          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 539          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 540          */
 541         public static function getArchiveQueryInfo() {
 542                 return self::getRevisionStore()->getArchiveQueryInfo();
 543         }
 544
 545         /**
 546          * Do a batched query to get the parent revision lengths
 547          *
 548          * @deprecated in 1.31, use RevisionStore::getRevisionSizes instead.
 549          *
 550          * @param IDatabase $db
 551          * @param array $revIds
 552          * @return array
 553          */
 554         public static function getParentLengths( $db, array $revIds ) {
 555                 return self::getRevisionStore()->listRevisionSizes( $db, $revIds );
 556         }
 557
 558         /**
 559          * @param object|array|RevisionRecord $row Either a database row or an array
 560          * @param int $queryFlags
 561          * @param Title|null $title
 562          *
 563          * @access private
 564          */
 565         function __construct( $row, $queryFlags = 0, Title $title = null ) {
 566                 global $wgUser;
 567
 568                 if ( $row instanceof RevisionRecord ) {
 569                         $this->mRecord = $row;
 570                 } elseif ( is_array( $row ) ) {
 571                         // If no user is specified, fall back to using the global user object, to stay
 572                         // compatible with pre-1.31 behavior.
 573                         if ( !isset( $row['user'] ) && !isset( $row['user_text'] ) ) {
 574                                 $row['user'] = $wgUser;
 575                         }
 576
 577                         $this->mRecord = self::getRevisionFactory()->newMutableRevisionFromArray(
 578                                 $row,
 579                                 $queryFlags,
 580                                 $this->ensureTitle( $row, $queryFlags, $title )
 581                         );
 582                 } elseif ( is_object( $row ) ) {
 583                         $this->mRecord = self::getRevisionFactory()->newRevisionFromRow(
 584                                 $row,
 585                                 $queryFlags,
 586                                 $this->ensureTitle( $row, $queryFlags, $title )
 587                         );
 588                 } else {
 589                         throw new InvalidArgumentException(
 590                                 '$row must be a row object, an associative array, or a RevisionRecord'
 591                         );
 592                 }
 593
 594                 Assert::postcondition( $this->mRecord !== null, 'Failed to construct a RevisionRecord' );
 595         }
 596
 597         /**
 598          * Make sure we have *some* Title object for use by the constructor.
 599          * For B/C, the constructor shouldn't fail even for a bad page ID or bad revision ID.
 600          *
 601          * @param array|object $row
 602          * @param int $queryFlags
 603          * @param Title|null $title
 604          *
 605          * @return Title $title if not null, or a Title constructed from information in $row.
 606          */
 607         private function ensureTitle( $row, $queryFlags, $title = null ) {
 608                 if ( $title ) {
 609                         return $title;
 610                 }
 611
 612                 if ( is_array( $row ) ) {
 613                         if ( isset( $row['title'] ) ) {
 614                                 if ( !( $row['title'] instanceof Title ) ) {
 615                                         throw new MWException( 'title field must contain a Title object.' );
 616                                 }
 617
 618                                 return $row['title'];
 619                         }
 620
 621                         $pageId = $row['page'] ?? 0;
 622                         $revId = $row['id'] ?? 0;
 623                 } else {
 624                         $pageId = $row->rev_page ?? 0;
 625                         $revId = $row->rev_id ?? 0;
 626                 }
 627
 628                 try {
 629                         $title = self::getRevisionStore()->getTitle( $pageId, $revId, $queryFlags );
 630                 } catch ( RevisionAccessException $ex ) {
 631                         // construct a dummy title!
 632                         wfLogWarning( __METHOD__ . ': ' . $ex->getMessage() );
 633
 634                         // NOTE: this Title will only be used inside RevisionRecord
 635                         $title = Title::makeTitleSafe( NS_SPECIAL, "Badtitle/ID=$pageId" );
 636                         $title->resetArticleID( $pageId );
 637                 }
 638
 639                 return $title;
 640         }
 641
 642         /**
 643          * @return RevisionRecord
 644          */
 645         public function getRevisionRecord() {
 646                 return $this->mRecord;
 647         }
 648
 649         /**
 650          * Get revision ID
 651          *
 652          * @return int|null
 653          */
 654         public function getId() {
 655                 return $this->mRecord->getId();
 656         }
 657
 658         /**
 659          * Set the revision ID
 660          *
 661          * This should only be used for proposed revisions that turn out to be null edits.
 662          *
 663          * @note Only supported on Revisions that were constructed based on associative arrays,
 664          *       since they are mutable.
 665          *
 666          * @since 1.19
 667          * @param int|string $id
 668          * @throws MWException
 669          */
 670         public function setId( $id ) {
 671                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 672                         $this->mRecord->setId( intval( $id ) );
 673                 } else {
 674                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 675                 }
 676         }
 677
 678         /**
 679          * Set the user ID/name
 680          *
 681          * This should only be used for proposed revisions that turn out to be null edits
 682          *
 683          * @note Only supported on Revisions that were constructed based on associative arrays,
 684          *       since they are mutable.
 685          *
 686          * @since 1.28
 687          * @deprecated since 1.31, please reuse old Revision object
 688          * @param int $id User ID
 689          * @param string $name User name
 690          * @throws MWException
 691          */
 692         public function setUserIdAndName( $id, $name ) {
 693                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 694                         $user = User::newFromAnyId( intval( $id ), $name, null );
 695                         $this->mRecord->setUser( $user );
 696                 } else {
 697                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 698                 }
 699         }
 700
 701         /**
 702          * @return SlotRecord
 703          */
 704         private function getMainSlotRaw() {
 705                 return $this->mRecord->getSlot( SlotRecord::MAIN, RevisionRecord::RAW );
 706         }
 707
 708         /**
 709          * Get the ID of the row of the text table that contains the content of the
 710          * revision's main slot, if that content is stored in the text table.
 711          *
 712          * If the content is stored elsewhere, this returns null.
 713          *
 714          * @deprecated since 1.31, use RevisionRecord()->getSlot()->getContentAddress() to
 715          * get that actual address that can be used with BlobStore::getBlob(); or use
 716          * RevisionRecord::hasSameContent() to check if two revisions have the same content.
 717          *
 718          * @return int|null
 719          */
 720         public function getTextId() {
 721                 $slot = $this->getMainSlotRaw();
 722                 return $slot->hasAddress()
 723                         ? self::getBlobStore()->getTextIdFromAddress( $slot->getAddress() )
 724                         : null;
 725         }
 726
 727         /**
 728          * Get parent revision ID (the original previous page revision)
 729          *
 730          * @return int|null The ID of the parent revision. 0 indicates that there is no
 731          * parent revision. Null indicates that the parent revision is not known.
 732          */
 733         public function getParentId() {
 734                 return $this->mRecord->getParentId();
 735         }
 736
 737         /**
 738          * Returns the length of the text in this revision, or null if unknown.
 739          *
 740          * @return int|null
 741          */
 742         public function getSize() {
 743                 try {
 744                         return $this->mRecord->getSize();
 745                 } catch ( RevisionAccessException $ex ) {
 746                         return null;
 747                 }
 748         }
 749
 750         /**
 751          * Returns the base36 sha1 of the content in this revision, or null if unknown.
 752          *
 753          * @return string|null
 754          */
 755         public function getSha1() {
 756                 try {
 757                         return $this->mRecord->getSha1();
 758                 } catch ( RevisionAccessException $ex ) {
 759                         return null;
 760                 }
 761         }
 762
 763         /**
 764          * Returns the title of the page associated with this entry.
 765          * Since 1.31, this will never return null.
 766          *
 767          * Will do a query, when title is not set and id is given.
 768          *
 769          * @return Title
 770          */
 771         public function getTitle() {
 772                 $linkTarget = $this->mRecord->getPageAsLinkTarget();
 773                 return Title::newFromLinkTarget( $linkTarget );
 774         }
 775
 776         /**
 777          * Set the title of the revision
 778          *
 779          * @deprecated since 1.31, this is now a noop. Pass the Title to the constructor instead.
 780          *
 781          * @param Title $title
 782          */
 783         public function setTitle( $title ) {
 784                 if ( !$title->equals( $this->getTitle() ) ) {
 785                         throw new InvalidArgumentException(
 786                                 $title->getPrefixedText()
 787                                         . ' is not the same as '
 788                                         . $this->mRecord->getPageAsLinkTarget()->__toString()
 789                         );
 790                 }
 791         }
 792
 793         /**
 794          * Get the page ID
 795          *
 796          * @return int|null
 797          */
 798         public function getPage() {
 799                 return $this->mRecord->getPageId();
 800         }
 801
 802         /**
 803          * Fetch revision's user id if it's available to the specified audience.
 804          * If the specified audience does not have access to it, zero will be
 805          * returned.
 806          *
 807          * @param int $audience One of:
 808          *   Revision::FOR_PUBLIC       to be displayed to all users
 809          *   Revision::FOR_THIS_USER    to be displayed to the given user
 810          *   Revision::RAW              get the ID regardless of permissions
 811          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 812          *   to the $audience parameter
 813          * @return int
 814          */
 815         public function getUser( $audience = self::FOR_PUBLIC, User $user = null ) {
 816                 global $wgUser;
 817
 818                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 819                         $user = $wgUser;
 820                 }
 821
 822                 $user = $this->mRecord->getUser( $audience, $user );
 823                 return $user ? $user->getId() : 0;
 824         }
 825
 826         /**
 827          * Fetch revision's username if it's available to the specified audience.
 828          * If the specified audience does not have access to the username, an
 829          * empty string will be returned.
 830          *
 831          * @param int $audience One of:
 832          *   Revision::FOR_PUBLIC       to be displayed to all users
 833          *   Revision::FOR_THIS_USER    to be displayed to the given user
 834          *   Revision::RAW              get the text regardless of permissions
 835          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 836          *   to the $audience parameter
 837          * @return string
 838          */
 839         public function getUserText( $audience = self::FOR_PUBLIC, User $user = null ) {
 840                 global $wgUser;
 841
 842                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 843                         $user = $wgUser;
 844                 }
 845
 846                 $user = $this->mRecord->getUser( $audience, $user );
 847                 return $user ? $user->getName() : '';
 848         }
 849
 850         /**
 851          * Fetch revision comment if it's available to the specified audience.
 852          * If the specified audience does not have access to the comment, an
 853          * empty string will be returned.
 854          *
 855          * @param int $audience One of:
 856          *   Revision::FOR_PUBLIC       to be displayed to all users
 857          *   Revision::FOR_THIS_USER    to be displayed to the given user
 858          *   Revision::RAW              get the text regardless of permissions
 859          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 860          *   to the $audience parameter
 861          * @return string
 862          */
 863         function getComment( $audience = self::FOR_PUBLIC, User $user = null ) {
 864                 global $wgUser;
 865
 866                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 867                         $user = $wgUser;
 868                 }
 869
 870                 $comment = $this->mRecord->getComment( $audience, $user );
 871                 return $comment === null ? null : $comment->text;
 872         }
 873
 874         /**
 875          * @return bool
 876          */
 877         public function isMinor() {
 878                 return $this->mRecord->isMinor();
 879         }
 880
 881         /**
 882          * @return int Rcid of the unpatrolled row, zero if there isn't one
 883          */
 884         public function isUnpatrolled() {
 885                 return self::getRevisionStore()->getRcIdIfUnpatrolled( $this->mRecord );
 886         }
 887
 888         /**
 889          * Get the RC object belonging to the current revision, if there's one
 890          *
 891          * @param int $flags (optional) $flags include:
 892          *      Revision::READ_LATEST  : Select the data from the master
 893          *
 894          * @since 1.22
 895          * @return RecentChange|null
 896          */
 897         public function getRecentChange( $flags = 0 ) {
 898                 return self::getRevisionStore()->getRecentChange( $this->mRecord, $flags );
 899         }
 900
 901         /**
 902          * @param int $field One of DELETED_* bitfield constants
 903          *
 904          * @return bool
 905          */
 906         public function isDeleted( $field ) {
 907                 return $this->mRecord->isDeleted( $field );
 908         }
 909
 910         /**
 911          * Get the deletion bitfield of the revision
 912          *
 913          * @return int
 914          */
 915         public function getVisibility() {
 916                 return $this->mRecord->getVisibility();
 917         }
 918
 919         /**
 920          * Fetch revision content if it's available to the specified audience.
 921          * If the specified audience does not have the ability to view this
 922          * revision, or the content could not be loaded, null will be returned.
 923          *
 924          * @param int $audience One of:
 925          *   Revision::FOR_PUBLIC       to be displayed to all users
 926          *   Revision::FOR_THIS_USER    to be displayed to $user
 927          *   Revision::RAW              get the text regardless of permissions
 928          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 929          *   to the $audience parameter
 930          * @since 1.21
 931          * @return Content|null
 932          */
 933         public function getContent( $audience = self::FOR_PUBLIC, User $user = null ) {
 934                 global $wgUser;
 935
 936                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 937                         $user = $wgUser;
 938                 }
 939
 940                 try {
 941                         return $this->mRecord->getContent( SlotRecord::MAIN, $audience, $user );
 942                 }
 943                 catch ( RevisionAccessException $e ) {
 944                         return null;
 945                 }
 946         }
 947
 948         /**
 949          * Get original serialized data (without checking view restrictions)
 950          *
 951          * @since 1.21
 952          * @deprecated since 1.31, use BlobStore::getBlob instead.
 953          *
 954          * @return string
 955          */
 956         public function getSerializedData() {
 957                 $slot = $this->getMainSlotRaw();
 958                 return $slot->getContent()->serialize();
 959         }
 960
 961         /**
 962          * Returns the content model for the main slot of this revision.
 963          *
 964          * If no content model was stored in the database, the default content model for the title is
 965          * used to determine the content model to use. If no title is know, CONTENT_MODEL_WIKITEXT
 966          * is used as a last resort.
 967          *
 968          * @todo drop this, with MCR, there no longer is a single model associated with a revision.
 969          *
 970          * @return string The content model id associated with this revision,
 971          *     see the CONTENT_MODEL_XXX constants.
 972          */
 973         public function getContentModel() {
 974                 return $this->getMainSlotRaw()->getModel();
 975         }
 976
 977         /**
 978          * Returns the content format for the main slot of this revision.
 979          *
 980          * If no content format was stored in the database, the default format for this
 981          * revision's content model is returned.
 982          *
 983          * @todo drop this, the format is irrelevant to the revision!
 984          *
 985          * @return string The content format id associated with this revision,
 986          *     see the CONTENT_FORMAT_XXX constants.
 987          */
 988         public function getContentFormat() {
 989                 $format = $this->getMainSlotRaw()->getFormat();
 990
 991                 if ( $format === null ) {
 992                         // if no format was stored along with the blob, fall back to default format
 993                         $format = $this->getContentHandler()->getDefaultFormat();
 994                 }
 995
 996                 return $format;
 997         }
 998
 999         /**
1000          * Returns the content handler appropriate for this revision's content model.
1001          *
1002          * @throws MWException
1003          * @return ContentHandler
1004          */
1005         public function getContentHandler() {
1006                 return ContentHandler::getForModelID( $this->getContentModel() );
1007         }
1008
1009         /**
1010          * @return string
1011          */
1012         public function getTimestamp() {
1013                 return $this->mRecord->getTimestamp();
1014         }
1015
1016         /**
1017          * @return bool
1018          */
1019         public function isCurrent() {
1020                 return ( $this->mRecord instanceof RevisionStoreRecord ) && $this->mRecord->isCurrent();
1021         }
1022
1023         /**
1024          * Get previous revision for this title
1025          *
1026          * @return Revision|null
1027          */
1028         public function getPrevious() {
1029                 $title = $this->getTitle();
1030                 $rec = self::getRevisionLookup()->getPreviousRevision( $this->mRecord, $title );
1031                 return $rec === null ? null : new Revision( $rec, self::READ_NORMAL, $title );
1032         }
1033
1034         /**
1035          * Get next revision for this title
1036          *
1037          * @return Revision|null
1038          */
1039         public function getNext() {
1040                 $title = $this->getTitle();
1041                 $rec = self::getRevisionLookup()->getNextRevision( $this->mRecord, $title );
1042                 return $rec === null ? null : new Revision( $rec, self::READ_NORMAL, $title );
1043         }
1044
1045         /**
1046          * Get revision text associated with an old or archive row
1047          *
1048          * If the text field is not included, this uses RevisionStore to load the appropriate slot
1049          * and return its serialized content. This is the default backwards-compatibility behavior
1050          * when reading from the MCR aware database schema is enabled. For this to work, either
1051          * the revision ID or the page ID must be included in the row.
1052          *
1053          * When using the old text field, the flags field must also be set. Including the old_id
1054          * field will activate cache usage as long as the $wiki parameter is not set.
1055          *
1056          * @deprecated since 1.32, use RevisionStore::newRevisionFromRow instead.
1057          *
1058          * @param stdClass $row The text data. If a falsy value is passed instead, false is returned.
1059          * @param string $prefix Table prefix (default 'old_')
1060          * @param string|bool $wiki The name of the wiki to load the revision text from
1061          *   (same as the wiki $row was loaded from) or false to indicate the local
1062          *   wiki (this is the default). Otherwise, it must be a symbolic wiki database
1063          *   identifier as understood by the LoadBalancer class.
1064          * @return string|false Text the text requested or false on failure
1065          */
1066         public static function getRevisionText( $row, $prefix = 'old_', $wiki = false ) {
1067                 global $wgMultiContentRevisionSchemaMigrationStage;
1068
1069                 if ( !$row ) {
1070                         return false;
1071                 }
1072
1073                 $textField = $prefix . 'text';
1074                 $flagsField = $prefix . 'flags';
1075
1076                 if ( isset( $row->$textField ) ) {
1077                         if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
1078                                 // The text field was read, but it's no longer being populated!
1079                                 // We could gloss over this by using the text when it's there and loading
1080                                 // if when it's not, but it seems preferable to complain loudly about a
1081                                 // query that is no longer guaranteed to work reliably.
1082                                 throw new LogicException(
1083                                         'Cannot use ' . __METHOD__ . ' with the ' . $textField . ' field when'
1084                                         . ' $wgMultiContentRevisionSchemaMigrationStage does not include'
1085                                         . ' SCHEMA_COMPAT_WRITE_OLD. The field may not be populated for all revisions!'
1086                                 );
1087                         }
1088
1089                         $text = $row->$textField;
1090                 } else {
1091                         // Missing text field, we are probably looking at the MCR-enabled DB schema.
1092
1093                         if ( !( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) ) {
1094                                 // This method should no longer be used with the new schema. Ideally, we
1095                                 // would already trigger a deprecation warning when SCHEMA_COMPAT_READ_NEW is set.
1096                                 wfDeprecated( __METHOD__ . ' (MCR without SCHEMA_COMPAT_WRITE_OLD)', '1.32' );
1097                         }
1098
1099                         $store = self::getRevisionStore( $wiki );
1100                         $rev = $prefix === 'ar_'
1101                                 ? $store->newRevisionFromArchiveRow( $row )
1102                                 : $store->newRevisionFromRow( $row );
1103
1104                         $content = $rev->getContent( SlotRecord::MAIN );
1105                         return $content ? $content->serialize() : false;
1106                 }
1107
1108                 if ( isset( $row->$flagsField ) ) {
1109                         $flags = explode( ',', $row->$flagsField );
1110                 } else {
1111                         $flags = [];
1112                 }
1113
1114                 $cacheKey = isset( $row->old_id )
1115                         ? SqlBlobStore::makeAddressFromTextId( $row->old_id )
1116                         : null;
1117
1118                 $revisionText = self::getBlobStore( $wiki )->expandBlob( $text, $flags, $cacheKey );
1119
1120                 if ( $revisionText === false ) {
1121                         if ( isset( $row->old_id ) ) {
1122                                 wfLogWarning( __METHOD__ . ": Bad data in text row {$row->old_id}! " );
1123                         } else {
1124                                 wfLogWarning( __METHOD__ . ": Bad data in text row! " );
1125                         }
1126                         return false;
1127                 }
1128
1129                 return $revisionText;
1130         }
1131
1132         /**
1133          * If $wgCompressRevisions is enabled, we will compress data.
1134          * The input string is modified in place.
1135          * Return value is the flags field: contains 'gzip' if the
1136          * data is compressed, and 'utf-8' if we're saving in UTF-8
1137          * mode.
1138          *
1139          * @param mixed &$text Reference to a text
1140          * @return string
1141          */
1142         public static function compressRevisionText( &$text ) {
1143                 return self::getBlobStore()->compressData( $text );
1144         }
1145
1146         /**
1147          * Re-converts revision text according to it's flags.
1148          *
1149          * @param mixed $text Reference to a text
1150          * @param array $flags Compression flags
1151          * @return string|bool Decompressed text, or false on failure
1152          */
1153         public static function decompressRevisionText( $text, $flags ) {
1154                 if ( $text === false ) {
1155                         // Text failed to be fetched; nothing to do
1156                         return false;
1157                 }
1158
1159                 return self::getBlobStore()->decompressData( $text, $flags );
1160         }
1161
1162         /**
1163          * Insert a new revision into the database, returning the new revision ID
1164          * number on success and dies horribly on failure.
1165          *
1166          * @param IDatabase $dbw (master connection)
1167          * @throws MWException
1168          * @return int The revision ID
1169          */
1170         public function insertOn( $dbw ) {
1171                 global $wgUser;
1172
1173                 // Note that $this->mRecord->getId() will typically return null here, but not always,
1174                 // e.g. not when restoring a revision.
1175
1176                 if ( $this->mRecord->getUser( RevisionRecord::RAW ) === null ) {
1177                         if ( $this->mRecord instanceof MutableRevisionRecord ) {
1178                                 $this->mRecord->setUser( $wgUser );
1179                         } else {
1180                                 throw new MWException( 'Cannot insert revision with no associated user.' );
1181                         }
1182                 }
1183
1184                 $rec = self::getRevisionStore()->insertRevisionOn( $this->mRecord, $dbw );
1185
1186                 $this->mRecord = $rec;
1187                 Assert::postcondition( $this->mRecord !== null, 'Failed to acquire a RevisionRecord' );
1188
1189                 return $rec->getId();
1190         }
1191
1192         /**
1193          * Get the base 36 SHA-1 value for a string of text
1194          * @param string $text
1195          * @return string
1196          */
1197         public static function base36Sha1( $text ) {
1198                 return SlotRecord::base36Sha1( $text );
1199         }
1200
1201         /**
1202          * Create a new null-revision for insertion into a page's
1203          * history. This will not re-save the text, but simply refer
1204          * to the text from the previous version.
1205          *
1206          * Such revisions can for instance identify page rename
1207          * operations and other such meta-modifications.
1208          *
1209          * @param IDatabase $dbw
1210          * @param int $pageId ID number of the page to read from
1211          * @param string $summary Revision's summary
1212          * @param bool $minor Whether the revision should be considered as minor
1213          * @param User|null $user User object to use or null for $wgUser
1214          * @return Revision|null Revision or null on error
1215          */
1216         public static function newNullRevision( $dbw, $pageId, $summary, $minor, $user = null ) {
1217                 global $wgUser;
1218                 if ( !$user ) {
1219                         $user = $wgUser;
1220                 }
1221
1222                 $comment = CommentStoreComment::newUnsavedComment( $summary, null );
1223
1224                 $title = Title::newFromID( $pageId, Title::GAID_FOR_UPDATE );
1225                 if ( $title === null ) {
1226                         return null;
1227                 }
1228
1229                 $rec = self::getRevisionStore()->newNullRevision( $dbw, $title, $comment, $minor, $user );
1230
1231                 return $rec ? new Revision( $rec ) : null;
1232         }
1233
1234         /**
1235          * Determine if the current user is allowed to view a particular
1236          * field of this revision, if it's marked as deleted.
1237          *
1238          * @param int $field One of self::DELETED_TEXT,
1239          *                              self::DELETED_COMMENT,
1240          *                              self::DELETED_USER
1241          * @param User|null $user User object to check, or null to use $wgUser
1242          * @return bool
1243          */
1244         public function userCan( $field, User $user = null ) {
1245                 return self::userCanBitfield( $this->getVisibility(), $field, $user );
1246         }
1247
1248         /**
1249          * Determine if the current user is allowed to view a particular
1250          * field of this revision, if it's marked as deleted. This is used
1251          * by various classes to avoid duplication.
1252          *
1253          * @param int $bitfield Current field
1254          * @param int $field One of self::DELETED_TEXT = File::DELETED_FILE,
1255          *                               self::DELETED_COMMENT = File::DELETED_COMMENT,
1256          *                               self::DELETED_USER = File::DELETED_USER
1257          * @param User|null $user User object to check, or null to use $wgUser
1258          * @param Title|null $title A Title object to check for per-page restrictions on,
1259          *                          instead of just plain userrights
1260          * @return bool
1261          */
1262         public static function userCanBitfield( $bitfield, $field, User $user = null,
1263                 Title $title = null
1264         ) {
1265                 global $wgUser;
1266
1267                 if ( !$user ) {
1268                         $user = $wgUser;
1269                 }
1270
1271                 return RevisionRecord::userCanBitfield( $bitfield, $field, $user, $title );
1272         }
1273
1274         /**
1275          * Get rev_timestamp from rev_id, without loading the rest of the row
1276          *
1277          * @param Title $title
1278          * @param int $id
1279          * @param int $flags
1280          * @return string|bool False if not found
1281          */
1282         static function getTimestampFromId( $title, $id, $flags = 0 ) {
1283                 return self::getRevisionStore()->getTimestampFromId( $title, $id, $flags );
1284         }
1285
1286         /**
1287          * Get count of revisions per page...not very efficient
1288          *
1289          * @param IDatabase $db
1290          * @param int $id Page id
1291          * @return int
1292          */
1293         static function countByPageId( $db, $id ) {
1294                 return self::getRevisionStore()->countRevisionsByPageId( $db, $id );
1295         }
1296
1297         /**
1298          * Get count of revisions per page...not very efficient
1299          *
1300          * @param IDatabase $db
1301          * @param Title $title
1302          * @return int
1303          */
1304         static function countByTitle( $db, $title ) {
1305                 return self::getRevisionStore()->countRevisionsByTitle( $db, $title );
1306         }
1307
1308         /**
1309          * Check if no edits were made by other users since
1310          * the time a user started editing the page. Limit to
1311          * 50 revisions for the sake of performance.
1312          *
1313          * @since 1.20
1314          * @deprecated since 1.24
1315          *
1316          * @param IDatabase|int $db The Database to perform the check on. May be given as a
1317          *        Database object or a database identifier usable with wfGetDB.
1318          * @param int $pageId The ID of the page in question
1319          * @param int $userId The ID of the user in question
1320          * @param string $since Look at edits since this time
1321          *
1322          * @return bool True if the given user was the only one to edit since the given timestamp
1323          */
1324         public static function userWasLastToEdit( $db, $pageId, $userId, $since ) {
1325                 if ( is_int( $db ) ) {
1326                         $db = wfGetDB( $db );
1327                 }
1328
1329                 return self::getRevisionStore()->userWasLastToEdit( $db, $pageId, $userId, $since );
1330         }
1331
1332         /**
1333          * Load a revision based on a known page ID and current revision ID from the DB
1334          *
1335          * This method allows for the use of caching, though accessing anything that normally
1336          * requires permission checks (aside from the text) will trigger a small DB lookup.
1337          * The title will also be loaded if $pageIdOrTitle is an integer ID.
1338          *
1339          * @param IDatabase $db ignored!
1340          * @param int|Title $pageIdOrTitle Page ID or Title object
1341          * @param int $revId Known current revision of this page. Determined automatically if not given.
1342          * @return Revision|bool Returns false if missing
1343          * @since 1.28
1344          */
1345         public static function newKnownCurrent( IDatabase $db, $pageIdOrTitle, $revId = 0 ) {
1346                 $title = $pageIdOrTitle instanceof Title
1347                         ? $pageIdOrTitle
1348                         : Title::newFromID( $pageIdOrTitle );
1349
1350                 if ( !$title ) {
1351                         return false;
1352                 }
1353
1354                 $record = self::getRevisionLookup()->getKnownCurrentRevision( $title, $revId );
1355                 return $record ? new Revision( $record ) : false;
1356         }
1357 }