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\Storage\MutableRevisionRecord;
  24 use MediaWiki\Storage\RevisionAccessException;
  25 use MediaWiki\Storage\RevisionFactory;
  26 use MediaWiki\Storage\RevisionLookup;
  27 use MediaWiki\Storage\RevisionRecord;
  28 use MediaWiki\Storage\RevisionStore;
  29 use MediaWiki\Storage\RevisionStoreRecord;
  30 use MediaWiki\Storage\SlotRecord;
  31 use MediaWiki\Storage\SqlBlobStore;
  32 use MediaWiki\User\UserIdentityValue;
  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() {
  66                 return MediaWikiServices::getInstance()->getRevisionStore();
  67         }
  68
  69         /**
  70          * @return RevisionLookup
  71          */
  72         protected static function getRevisionLookup() {
  73                 return MediaWikiServices::getInstance()->getRevisionLookup();
  74         }
  75
  76         /**
  77          * @return RevisionFactory
  78          */
  79         protected static function getRevisionFactory() {
  80                 return MediaWikiServices::getInstance()->getRevisionFactory();
  81         }
  82
  83         /**
  84          * @param bool|string $wiki The ID of the target wiki database. Use false for the local wiki.
  85          *
  86          * @return SqlBlobStore
  87          */
  88         protected static function getBlobStore( $wiki = false ) {
  89                 $store = MediaWikiServices::getInstance()
  90                         ->getBlobStoreFactory()
  91                         ->newSqlBlobStore( $wiki );
  92
  93                 if ( !$store instanceof SqlBlobStore ) {
  94                         throw new RuntimeException(
  95                                 'The backwards compatibility code in Revision currently requires the BlobStore '
  96                                 . 'service to be an SqlBlobStore instance, but it is a ' . get_class( $store )
  97                         );
  98                 }
  99
 100                 return $store;
 101         }
 102
 103         /**
 104          * Load a page revision from a given revision ID number.
 105          * Returns null if no such revision can be found.
 106          *
 107          * $flags include:
 108          *      Revision::READ_LATEST  : Select the data from the master
 109          *      Revision::READ_LOCKING : Select & lock the data from the master
 110          *
 111          * @param int $id
 112          * @param int $flags (optional)
 113          * @return Revision|null
 114          */
 115         public static function newFromId( $id, $flags = 0 ) {
 116                 $rec = self::getRevisionLookup()->getRevisionById( $id, $flags );
 117                 return $rec === null ? null : new Revision( $rec, $flags );
 118         }
 119
 120         /**
 121          * Load either the current, or a specified, revision
 122          * that's attached to a given link target. If not attached
 123          * to that link target, will return null.
 124          *
 125          * $flags include:
 126          *      Revision::READ_LATEST  : Select the data from the master
 127          *      Revision::READ_LOCKING : Select & lock the data from the master
 128          *
 129          * @param LinkTarget $linkTarget
 130          * @param int $id (optional)
 131          * @param int $flags Bitfield (optional)
 132          * @return Revision|null
 133          */
 134         public static function newFromTitle( LinkTarget $linkTarget, $id = 0, $flags = 0 ) {
 135                 $rec = self::getRevisionLookup()->getRevisionByTitle( $linkTarget, $id, $flags );
 136                 return $rec === null ? null : new Revision( $rec, $flags );
 137         }
 138
 139         /**
 140          * Load either the current, or a specified, revision
 141          * that's attached to a given page ID.
 142          * Returns null if no such revision can be found.
 143          *
 144          * $flags include:
 145          *      Revision::READ_LATEST  : Select the data from the master (since 1.20)
 146          *      Revision::READ_LOCKING : Select & lock the data from the master
 147          *
 148          * @param int $pageId
 149          * @param int $revId (optional)
 150          * @param int $flags Bitfield (optional)
 151          * @return Revision|null
 152          */
 153         public static function newFromPageId( $pageId, $revId = 0, $flags = 0 ) {
 154                 $rec = self::getRevisionLookup()->getRevisionByPageId( $pageId, $revId, $flags );
 155                 return $rec === null ? null : new Revision( $rec, $flags );
 156         }
 157
 158         /**
 159          * Make a fake revision object from an archive table row. This is queried
 160          * for permissions or even inserted (as in Special:Undelete)
 161          *
 162          * @param object $row
 163          * @param array $overrides
 164          *
 165          * @throws MWException
 166          * @return Revision
 167          */
 168         public static function newFromArchiveRow( $row, $overrides = [] ) {
 169                 /**
 170                  * MCR Migration: https://phabricator.wikimedia.org/T183564
 171                  * This method used to overwrite attributes, then passed to Revision::__construct
 172                  * RevisionStore::newRevisionFromArchiveRow instead overrides row field names
 173                  * So do a conversion here.
 174                  */
 175                 if ( array_key_exists( 'page', $overrides ) ) {
 176                         $overrides['page_id'] = $overrides['page'];
 177                         unset( $overrides['page'] );
 178                 }
 179
 180                 /**
 181                  * We require a Title for both the Revision object and the RevisionRecord.
 182                  * Below is duplicated logic from RevisionStore::newRevisionFromArchiveRow
 183                  * to fetch a title in order pass it into the Revision object.
 184                  */
 185                 $title = null;
 186                 if ( isset( $overrides['title'] ) ) {
 187                         if ( !( $overrides['title'] instanceof Title ) ) {
 188                                 throw new MWException( 'title field override must contain a Title object.' );
 189                         }
 190
 191                         $title = $overrides['title'];
 192                 }
 193                 if ( $title !== null ) {
 194                         if ( isset( $row->ar_namespace ) && isset( $row->ar_title ) ) {
 195                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 196                         } else {
 197                                 throw new InvalidArgumentException(
 198                                         'A Title or ar_namespace and ar_title must be given'
 199                                 );
 200                         }
 201                 }
 202
 203                 $rec = self::getRevisionFactory()->newRevisionFromArchiveRow( $row, 0, $title, $overrides );
 204                 return new Revision( $rec, self::READ_NORMAL, $title );
 205         }
 206
 207         /**
 208          * @since 1.19
 209          *
 210          * MCR migration note: replaced by RevisionStore::newRevisionFromRow(). Note that
 211          * newFromRow() also accepts arrays, while newRevisionFromRow() does not. Instead,
 212          * a MutableRevisionRecord should be constructed directly.
 213          * RevisionStore::newMutableRevisionFromArray() can be used as a temporary replacement,
 214          * but should be avoided.
 215          *
 216          * @param object|array $row
 217          * @return Revision
 218          */
 219         public static function newFromRow( $row ) {
 220                 if ( is_array( $row ) ) {
 221                         $rec = self::getRevisionFactory()->newMutableRevisionFromArray( $row );
 222                 } else {
 223                         $rec = self::getRevisionFactory()->newRevisionFromRow( $row );
 224                 }
 225
 226                 return new Revision( $rec );
 227         }
 228
 229         /**
 230          * Load a page revision from a given revision ID number.
 231          * Returns null if no such revision can be found.
 232          *
 233          * @deprecated since 1.31, use RevisionStore::getRevisionById() instead.
 234          *
 235          * @param IDatabase $db
 236          * @param int $id
 237          * @return Revision|null
 238          */
 239         public static function loadFromId( $db, $id ) {
 240                 wfDeprecated( __METHOD__, '1.31' ); // no known callers
 241                 $rec = self::getRevisionStore()->loadRevisionFromId( $db, $id );
 242                 return $rec === null ? null : new Revision( $rec );
 243         }
 244
 245         /**
 246          * Load either the current, or a specified, revision
 247          * that's attached to a given page. If not attached
 248          * to that page, will return null.
 249          *
 250          * @deprecated since 1.31, use RevisionStore::getRevisionByPageId() instead.
 251          *
 252          * @param IDatabase $db
 253          * @param int $pageid
 254          * @param int $id
 255          * @return Revision|null
 256          */
 257         public static function loadFromPageId( $db, $pageid, $id = 0 ) {
 258                 $rec = self::getRevisionStore()->loadRevisionFromPageId( $db, $pageid, $id );
 259                 return $rec === null ? null : new Revision( $rec );
 260         }
 261
 262         /**
 263          * Load either the current, or a specified, revision
 264          * that's attached to a given page. If not attached
 265          * to that page, will return null.
 266          *
 267          * @deprecated since 1.31, use RevisionStore::getRevisionByTitle() instead.
 268          *
 269          * @param IDatabase $db
 270          * @param Title $title
 271          * @param int $id
 272          * @return Revision|null
 273          */
 274         public static function loadFromTitle( $db, $title, $id = 0 ) {
 275                 $rec = self::getRevisionStore()->loadRevisionFromTitle( $db, $title, $id );
 276                 return $rec === null ? null : new Revision( $rec );
 277         }
 278
 279         /**
 280          * Load the revision for the given title with the given timestamp.
 281          * WARNING: Timestamps may in some circumstances not be unique,
 282          * so this isn't the best key to use.
 283          *
 284          * @deprecated since 1.31, use RevisionStore::getRevisionByTimestamp()
 285          *   or RevisionStore::loadRevisionFromTimestamp() instead.
 286          *
 287          * @param IDatabase $db
 288          * @param Title $title
 289          * @param string $timestamp
 290          * @return Revision|null
 291          */
 292         public static function loadFromTimestamp( $db, $title, $timestamp ) {
 293                 $rec = self::getRevisionStore()->loadRevisionFromTimestamp( $db, $title, $timestamp );
 294                 return $rec === null ? null : new Revision( $rec );
 295         }
 296
 297         /**
 298          * Return a wrapper for a series of database rows to
 299          * fetch all of a given page's revisions in turn.
 300          * Each row can be fed to the constructor to get objects.
 301          *
 302          * @param LinkTarget $title
 303          * @return ResultWrapper
 304          * @deprecated Since 1.28, no callers in core nor in known extensions. No-op since 1.31.
 305          */
 306         public static function fetchRevision( LinkTarget $title ) {
 307                 wfDeprecated( __METHOD__, '1.31' );
 308                 return new FakeResultWrapper( [] );
 309         }
 310
 311         /**
 312          * Return the value of a select() JOIN conds array for the user table.
 313          * This will get user table rows for logged-in users.
 314          * @since 1.19
 315          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 316          * @return array
 317          */
 318         public static function userJoinCond() {
 319                 wfDeprecated( __METHOD__, '1.31' );
 320                 return [ 'LEFT JOIN', [ 'rev_user != 0', 'user_id = rev_user' ] ];
 321         }
 322
 323         /**
 324          * Return the value of a select() page conds array for the page table.
 325          * This will assure that the revision(s) are not orphaned from live pages.
 326          * @since 1.19
 327          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 328          * @return array
 329          */
 330         public static function pageJoinCond() {
 331                 wfDeprecated( __METHOD__, '1.31' );
 332                 return [ 'INNER JOIN', [ 'page_id = rev_page' ] ];
 333         }
 334
 335         /**
 336          * Return the list of revision fields that should be selected to create
 337          * a new revision.
 338          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 339          * @return array
 340          */
 341         public static function selectFields() {
 342                 global $wgContentHandlerUseDB;
 343
 344                 wfDeprecated( __METHOD__, '1.31' );
 345
 346                 $fields = [
 347                         'rev_id',
 348                         'rev_page',
 349                         'rev_text_id',
 350                         'rev_timestamp',
 351                         'rev_user_text',
 352                         'rev_user',
 353                         'rev_minor_edit',
 354                         'rev_deleted',
 355                         'rev_len',
 356                         'rev_parent_id',
 357                         'rev_sha1',
 358                 ];
 359
 360                 $fields += CommentStore::getStore()->getFields( 'rev_comment' );
 361
 362                 if ( $wgContentHandlerUseDB ) {
 363                         $fields[] = 'rev_content_format';
 364                         $fields[] = 'rev_content_model';
 365                 }
 366
 367                 return $fields;
 368         }
 369
 370         /**
 371          * Return the list of revision fields that should be selected to create
 372          * a new revision from an archive row.
 373          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 374          * @return array
 375          */
 376         public static function selectArchiveFields() {
 377                 global $wgContentHandlerUseDB;
 378
 379                 wfDeprecated( __METHOD__, '1.31' );
 380
 381                 $fields = [
 382                         'ar_id',
 383                         'ar_page_id',
 384                         'ar_rev_id',
 385                         'ar_text',
 386                         'ar_text_id',
 387                         'ar_timestamp',
 388                         'ar_user_text',
 389                         'ar_user',
 390                         'ar_minor_edit',
 391                         'ar_deleted',
 392                         'ar_len',
 393                         'ar_parent_id',
 394                         'ar_sha1',
 395                 ];
 396
 397                 $fields += CommentStore::getStore()->getFields( 'ar_comment' );
 398
 399                 if ( $wgContentHandlerUseDB ) {
 400                         $fields[] = 'ar_content_format';
 401                         $fields[] = 'ar_content_model';
 402                 }
 403                 return $fields;
 404         }
 405
 406         /**
 407          * Return the list of text fields that should be selected to read the
 408          * revision text
 409          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'text' ] ) instead.
 410          * @return array
 411          */
 412         public static function selectTextFields() {
 413                 wfDeprecated( __METHOD__, '1.31' );
 414                 return [
 415                         'old_text',
 416                         'old_flags'
 417                 ];
 418         }
 419
 420         /**
 421          * Return the list of page fields that should be selected from page table
 422          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'page' ] ) instead.
 423          * @return array
 424          */
 425         public static function selectPageFields() {
 426                 wfDeprecated( __METHOD__, '1.31' );
 427                 return [
 428                         'page_namespace',
 429                         'page_title',
 430                         'page_id',
 431                         'page_latest',
 432                         'page_is_redirect',
 433                         'page_len',
 434                 ];
 435         }
 436
 437         /**
 438          * Return the list of user fields that should be selected from user table
 439          * @deprecated since 1.31, use RevisionStore::getQueryInfo( [ 'user' ] ) instead.
 440          * @return array
 441          */
 442         public static function selectUserFields() {
 443                 wfDeprecated( __METHOD__, '1.31' );
 444                 return [ 'user_name' ];
 445         }
 446
 447         /**
 448          * Return the tables, fields, and join conditions to be selected to create
 449          * a new revision object.
 450          * @since 1.31
 451          * @deprecated since 1.31, use RevisionStore::getQueryInfo() instead.
 452          * @param array $options Any combination of the following strings
 453          *  - 'page': Join with the page table, and select fields to identify the page
 454          *  - 'user': Join with the user table, and select the user name
 455          *  - 'text': Join with the text table, and select fields to load page text
 456          * @return array With three keys:
 457          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 458          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 459          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 460          */
 461         public static function getQueryInfo( $options = [] ) {
 462                 return self::getRevisionStore()->getQueryInfo( $options );
 463         }
 464
 465         /**
 466          * Return the tables, fields, and join conditions to be selected to create
 467          * a new archived revision object.
 468          * @since 1.31
 469          * @deprecated since 1.31, use RevisionStore::getArchiveQueryInfo() instead.
 470          * @return array With three keys:
 471          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 472          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 473          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 474          */
 475         public static function getArchiveQueryInfo() {
 476                 return self::getRevisionStore()->getArchiveQueryInfo();
 477         }
 478
 479         /**
 480          * Do a batched query to get the parent revision lengths
 481          *
 482          * @deprecated in 1.31, use RevisionStore::getRevisionSizes instead.
 483          *
 484          * @param IDatabase $db
 485          * @param array $revIds
 486          * @return array
 487          */
 488         public static function getParentLengths( $db, array $revIds ) {
 489                 return self::getRevisionStore()->listRevisionSizes( $db, $revIds );
 490         }
 491
 492         /**
 493          * @param object|array|RevisionRecord $row Either a database row or an array
 494          * @param int $queryFlags
 495          * @param Title|null $title
 496          *
 497          * @access private
 498          */
 499         function __construct( $row, $queryFlags = 0, Title $title = null ) {
 500                 global $wgUser;
 501
 502                 if ( $row instanceof RevisionRecord ) {
 503                         $this->mRecord = $row;
 504                 } elseif ( is_array( $row ) ) {
 505                         // If no user is specified, fall back to using the global user object, to stay
 506                         // compatible with pre-1.31 behavior.
 507                         if ( !isset( $row['user'] ) && !isset( $row['user_text'] ) ) {
 508                                 $row['user'] = $wgUser;
 509                         }
 510
 511                         $this->mRecord = self::getRevisionFactory()->newMutableRevisionFromArray(
 512                                 $row,
 513                                 $queryFlags,
 514                                 $this->ensureTitle( $row, $queryFlags, $title )
 515                         );
 516                 } elseif ( is_object( $row ) ) {
 517                         $this->mRecord = self::getRevisionFactory()->newRevisionFromRow(
 518                                 $row,
 519                                 $queryFlags,
 520                                 $this->ensureTitle( $row, $queryFlags, $title )
 521                         );
 522                 } else {
 523                         throw new InvalidArgumentException(
 524                                 '$row must be a row object, an associative array, or a RevisionRecord'
 525                         );
 526                 }
 527         }
 528
 529         /**
 530          * Make sure we have *some* Title object for use by the constructor.
 531          * For B/C, the constructor shouldn't fail even for a bad page ID or bad revision ID.
 532          *
 533          * @param array|object $row
 534          * @param int $queryFlags
 535          * @param Title|null $title
 536          *
 537          * @return Title $title if not null, or a Title constructed from information in $row.
 538          */
 539         private function ensureTitle( $row, $queryFlags, $title = null ) {
 540                 if ( $title ) {
 541                         return $title;
 542                 }
 543
 544                 if ( is_array( $row ) ) {
 545                         if ( isset( $row['title'] ) ) {
 546                                 if ( !( $row['title'] instanceof Title ) ) {
 547                                         throw new MWException( 'title field must contain a Title object.' );
 548                                 }
 549
 550                                 return $row['title'];
 551                         }
 552
 553                         $pageId = isset( $row['page'] ) ? $row['page'] : 0;
 554                         $revId = isset( $row['id'] ) ? $row['id'] : 0;
 555                 } else {
 556                         $pageId = isset( $row->rev_page ) ? $row->rev_page : 0;
 557                         $revId = isset( $row->rev_id ) ? $row->rev_id : 0;
 558                 }
 559
 560                 try {
 561                         $title = self::getRevisionStore()->getTitle( $pageId, $revId, $queryFlags );
 562                 } catch ( RevisionAccessException $ex ) {
 563                         // construct a dummy title!
 564                         wfLogWarning( __METHOD__ . ': ' . $ex->getMessage() );
 565
 566                         // NOTE: this Title will only be used inside RevisionRecord
 567                         $title = Title::makeTitleSafe( NS_SPECIAL, "Badtitle/ID=$pageId" );
 568                         $title->resetArticleID( $pageId );
 569                 }
 570
 571                 return $title;
 572         }
 573
 574         /**
 575          * @return RevisionRecord
 576          */
 577         public function getRevisionRecord() {
 578                 return $this->mRecord;
 579         }
 580
 581         /**
 582          * Get revision ID
 583          *
 584          * @return int|null
 585          */
 586         public function getId() {
 587                 return $this->mRecord->getId();
 588         }
 589
 590         /**
 591          * Set the revision ID
 592          *
 593          * This should only be used for proposed revisions that turn out to be null edits.
 594          *
 595          * @note Only supported on Revisions that were constructed based on associative arrays,
 596          *       since they are mutable.
 597          *
 598          * @since 1.19
 599          * @param int|string $id
 600          * @throws MWException
 601          */
 602         public function setId( $id ) {
 603                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 604                         $this->mRecord->setId( intval( $id ) );
 605                 } else {
 606                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 607                 }
 608         }
 609
 610         /**
 611          * Set the user ID/name
 612          *
 613          * This should only be used for proposed revisions that turn out to be null edits
 614          *
 615          * @note Only supported on Revisions that were constructed based on associative arrays,
 616          *       since they are mutable.
 617          *
 618          * @since 1.28
 619          * @deprecated since 1.31, please reuse old Revision object
 620          * @param int $id User ID
 621          * @param string $name User name
 622          * @throws MWException
 623          */
 624         public function setUserIdAndName( $id, $name ) {
 625                 if ( $this->mRecord instanceof MutableRevisionRecord ) {
 626                         $user = new UserIdentityValue( intval( $id ), $name );
 627                         $this->mRecord->setUser( $user );
 628                 } else {
 629                         throw new MWException( __METHOD__ . ' is not supported on this instance' );
 630                 }
 631         }
 632
 633         /**
 634          * @return SlotRecord
 635          */
 636         private function getMainSlotRaw() {
 637                 return $this->mRecord->getSlot( 'main', RevisionRecord::RAW );
 638         }
 639
 640         /**
 641          * Get the ID of the row of the text table that contains the content of the
 642          * revision's main slot, if that content is stored in the text table.
 643          *
 644          * If the content is stored elsewhere, this returns null.
 645          *
 646          * @deprecated since 1.31, use RevisionRecord()->getSlot()->getContentAddress() to
 647          * get that actual address that can be used with BlobStore::getBlob(); or use
 648          * RevisionRecord::hasSameContent() to check if two revisions have the same content.
 649          *
 650          * @return int|null
 651          */
 652         public function getTextId() {
 653                 $slot = $this->getMainSlotRaw();
 654                 return $slot->hasAddress()
 655                         ? self::getBlobStore()->getTextIdFromAddress( $slot->getAddress() )
 656                         : null;
 657         }
 658
 659         /**
 660          * Get parent revision ID (the original previous page revision)
 661          *
 662          * @return int|null The ID of the parent revision. 0 indicates that there is no
 663          * parent revision. Null indicates that the parent revision is not known.
 664          */
 665         public function getParentId() {
 666                 return $this->mRecord->getParentId();
 667         }
 668
 669         /**
 670          * Returns the length of the text in this revision, or null if unknown.
 671          *
 672          * @return int|null
 673          */
 674         public function getSize() {
 675                 try {
 676                         return $this->mRecord->getSize();
 677                 } catch ( RevisionAccessException $ex ) {
 678                         return null;
 679                 }
 680         }
 681
 682         /**
 683          * Returns the base36 sha1 of the content in this revision, or null if unknown.
 684          *
 685          * @return string|null
 686          */
 687         public function getSha1() {
 688                 try {
 689                         return $this->mRecord->getSha1();
 690                 } catch ( RevisionAccessException $ex ) {
 691                         return null;
 692                 }
 693         }
 694
 695         /**
 696          * Returns the title of the page associated with this entry.
 697          * Since 1.31, this will never return null.
 698          *
 699          * Will do a query, when title is not set and id is given.
 700          *
 701          * @return Title
 702          */
 703         public function getTitle() {
 704                 $linkTarget = $this->mRecord->getPageAsLinkTarget();
 705                 return Title::newFromLinkTarget( $linkTarget );
 706         }
 707
 708         /**
 709          * Set the title of the revision
 710          *
 711          * @deprecated: since 1.31, this is now a noop. Pass the Title to the constructor instead.
 712          *
 713          * @param Title $title
 714          */
 715         public function setTitle( $title ) {
 716                 if ( !$title->equals( $this->getTitle() ) ) {
 717                         throw new InvalidArgumentException(
 718                                 $title->getPrefixedText()
 719                                         . ' is not the same as '
 720                                         . $this->mRecord->getPageAsLinkTarget()->__toString()
 721                         );
 722                 }
 723         }
 724
 725         /**
 726          * Get the page ID
 727          *
 728          * @return int|null
 729          */
 730         public function getPage() {
 731                 return $this->mRecord->getPageId();
 732         }
 733
 734         /**
 735          * Fetch revision's user id if it's available to the specified audience.
 736          * If the specified audience does not have access to it, zero will be
 737          * returned.
 738          *
 739          * @param int $audience One of:
 740          *   Revision::FOR_PUBLIC       to be displayed to all users
 741          *   Revision::FOR_THIS_USER    to be displayed to the given user
 742          *   Revision::RAW              get the ID regardless of permissions
 743          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 744          *   to the $audience parameter
 745          * @return int
 746          */
 747         public function getUser( $audience = self::FOR_PUBLIC, User $user = null ) {
 748                 global $wgUser;
 749
 750                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 751                         $user = $wgUser;
 752                 }
 753
 754                 $user = $this->mRecord->getUser( $audience, $user );
 755                 return $user ? $user->getId() : 0;
 756         }
 757
 758         /**
 759          * Fetch revision's user id without regard for the current user's permissions
 760          *
 761          * @return int
 762          * @deprecated since 1.25, use getUser( Revision::RAW )
 763          */
 764         public function getRawUser() {
 765                 wfDeprecated( __METHOD__, '1.25' );
 766                 return $this->getUser( self::RAW );
 767         }
 768
 769         /**
 770          * Fetch revision's username if it's available to the specified audience.
 771          * If the specified audience does not have access to the username, an
 772          * empty string will be returned.
 773          *
 774          * @param int $audience One of:
 775          *   Revision::FOR_PUBLIC       to be displayed to all users
 776          *   Revision::FOR_THIS_USER    to be displayed to the given user
 777          *   Revision::RAW              get the text regardless of permissions
 778          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 779          *   to the $audience parameter
 780          * @return string
 781          */
 782         public function getUserText( $audience = self::FOR_PUBLIC, User $user = null ) {
 783                 global $wgUser;
 784
 785                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 786                         $user = $wgUser;
 787                 }
 788
 789                 $user = $this->mRecord->getUser( $audience, $user );
 790                 return $user ? $user->getName() : '';
 791         }
 792
 793         /**
 794          * Fetch revision's username without regard for view restrictions
 795          *
 796          * @return string
 797          * @deprecated since 1.25, use getUserText( Revision::RAW )
 798          */
 799         public function getRawUserText() {
 800                 wfDeprecated( __METHOD__, '1.25' );
 801                 return $this->getUserText( self::RAW );
 802         }
 803
 804         /**
 805          * Fetch revision comment if it's available to the specified audience.
 806          * If the specified audience does not have access to the comment, an
 807          * empty string will be returned.
 808          *
 809          * @param int $audience One of:
 810          *   Revision::FOR_PUBLIC       to be displayed to all users
 811          *   Revision::FOR_THIS_USER    to be displayed to the given user
 812          *   Revision::RAW              get the text regardless of permissions
 813          * @param User|null $user User object to check for, only if FOR_THIS_USER is passed
 814          *   to the $audience parameter
 815          * @return string
 816          */
 817         function getComment( $audience = self::FOR_PUBLIC, User $user = null ) {
 818                 global $wgUser;
 819
 820                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 821                         $user = $wgUser;
 822                 }
 823
 824                 $comment = $this->mRecord->getComment( $audience, $user );
 825                 return $comment === null ? null : $comment->text;
 826         }
 827
 828         /**
 829          * Fetch revision comment without regard for the current user's permissions
 830          *
 831          * @return string
 832          * @deprecated since 1.25, use getComment( Revision::RAW )
 833          */
 834         public function getRawComment() {
 835                 wfDeprecated( __METHOD__, '1.25' );
 836                 return $this->getComment( self::RAW );
 837         }
 838
 839         /**
 840          * @return bool
 841          */
 842         public function isMinor() {
 843                 return $this->mRecord->isMinor();
 844         }
 845
 846         /**
 847          * @return int Rcid of the unpatrolled row, zero if there isn't one
 848          */
 849         public function isUnpatrolled() {
 850                 return self::getRevisionStore()->getRcIdIfUnpatrolled( $this->mRecord );
 851         }
 852
 853         /**
 854          * Get the RC object belonging to the current revision, if there's one
 855          *
 856          * @param int $flags (optional) $flags include:
 857          *      Revision::READ_LATEST  : Select the data from the master
 858          *
 859          * @since 1.22
 860          * @return RecentChange|null
 861          */
 862         public function getRecentChange( $flags = 0 ) {
 863                 return self::getRevisionStore()->getRecentChange( $this->mRecord, $flags );
 864         }
 865
 866         /**
 867          * @param int $field One of DELETED_* bitfield constants
 868          *
 869          * @return bool
 870          */
 871         public function isDeleted( $field ) {
 872                 return $this->mRecord->isDeleted( $field );
 873         }
 874
 875         /**
 876          * Get the deletion bitfield of the revision
 877          *
 878          * @return int
 879          */
 880         public function getVisibility() {
 881                 return $this->mRecord->getVisibility();
 882         }
 883
 884         /**
 885          * Fetch revision content if it's available to the specified audience.
 886          * If the specified audience does not have the ability to view this
 887          * revision, or the content could not be loaded, null will be returned.
 888          *
 889          * @param int $audience One of:
 890          *   Revision::FOR_PUBLIC       to be displayed to all users
 891          *   Revision::FOR_THIS_USER    to be displayed to $user
 892          *   Revision::RAW              get the text regardless of permissions
 893          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 894          *   to the $audience parameter
 895          * @since 1.21
 896          * @return Content|null
 897          */
 898         public function getContent( $audience = self::FOR_PUBLIC, User $user = null ) {
 899                 global $wgUser;
 900
 901                 if ( $audience === self::FOR_THIS_USER && !$user ) {
 902                         $user = $wgUser;
 903                 }
 904
 905                 try {
 906                         return $this->mRecord->getContent( 'main', $audience, $user );
 907                 }
 908                 catch ( RevisionAccessException $e ) {
 909                         wfDebugLog(
 910                                 'T184670',
 911                                 __METHOD__ . ": Cannot get content: " . $e->getMessage() .
 912                                 "\n" . $e->getTraceAsString()
 913                         );
 914                         return null;
 915                 }
 916         }
 917
 918         /**
 919          * Get original serialized data (without checking view restrictions)
 920          *
 921          * @since 1.21
 922          * @deprecated since 1.31, use BlobStore::getBlob instead.
 923          *
 924          * @return string
 925          */
 926         public function getSerializedData() {
 927                 $slot = $this->getMainSlotRaw();
 928                 return $slot->getContent()->serialize();
 929         }
 930
 931         /**
 932          * Returns the content model for the main slot of this revision.
 933          *
 934          * If no content model was stored in the database, the default content model for the title is
 935          * used to determine the content model to use. If no title is know, CONTENT_MODEL_WIKITEXT
 936          * is used as a last resort.
 937          *
 938          * @todo: drop this, with MCR, there no longer is a single model associated with a revision.
 939          *
 940          * @return string The content model id associated with this revision,
 941          *     see the CONTENT_MODEL_XXX constants.
 942          */
 943         public function getContentModel() {
 944                 return $this->getMainSlotRaw()->getModel();
 945         }
 946
 947         /**
 948          * Returns the content format for the main slot of this revision.
 949          *
 950          * If no content format was stored in the database, the default format for this
 951          * revision's content model is returned.
 952          *
 953          * @todo: drop this, the format is irrelevant to the revision!
 954          *
 955          * @return string The content format id associated with this revision,
 956          *     see the CONTENT_FORMAT_XXX constants.
 957          */
 958         public function getContentFormat() {
 959                 $format = $this->getMainSlotRaw()->getFormat();
 960
 961                 if ( $format === null ) {
 962                         // if no format was stored along with the blob, fall back to default format
 963                         $format = $this->getContentHandler()->getDefaultFormat();
 964                 }
 965
 966                 return $format;
 967         }
 968
 969         /**
 970          * Returns the content handler appropriate for this revision's content model.
 971          *
 972          * @throws MWException
 973          * @return ContentHandler
 974          */
 975         public function getContentHandler() {
 976                 return ContentHandler::getForModelID( $this->getContentModel() );
 977         }
 978
 979         /**
 980          * @return string
 981          */
 982         public function getTimestamp() {
 983                 return $this->mRecord->getTimestamp();
 984         }
 985
 986         /**
 987          * @return bool
 988          */
 989         public function isCurrent() {
 990                 return ( $this->mRecord instanceof RevisionStoreRecord ) && $this->mRecord->isCurrent();
 991         }
 992
 993         /**
 994          * Get previous revision for this title
 995          *
 996          * @return Revision|null
 997          */
 998         public function getPrevious() {
 999                 $title = $this->getTitle();
1000                 $rec = self::getRevisionLookup()->getPreviousRevision( $this->mRecord, $title );
1001                 return $rec === null ? null : new Revision( $rec, self::READ_NORMAL, $title );
1002         }
1003
1004         /**
1005          * Get next revision for this title
1006          *
1007          * @return Revision|null
1008          */
1009         public function getNext() {
1010                 $title = $this->getTitle();
1011                 $rec = self::getRevisionLookup()->getNextRevision( $this->mRecord, $title );
1012                 return $rec === null ? null : new Revision( $rec, self::READ_NORMAL, $title );
1013         }
1014
1015         /**
1016          * Get revision text associated with an old or archive row
1017          *
1018          * Both the flags and the text field must be included. Including the old_id
1019          * field will activate cache usage as long as the $wiki parameter is not set.
1020          *
1021          * @param stdClass $row The text data
1022          * @param string $prefix Table prefix (default 'old_')
1023          * @param string|bool $wiki The name of the wiki to load the revision text from
1024          *   (same as the the wiki $row was loaded from) or false to indicate the local
1025          *   wiki (this is the default). Otherwise, it must be a symbolic wiki database
1026          *   identifier as understood by the LoadBalancer class.
1027          * @return string|false Text the text requested or false on failure
1028          */
1029         public static function getRevisionText( $row, $prefix = 'old_', $wiki = false ) {
1030                 $textField = $prefix . 'text';
1031                 $flagsField = $prefix . 'flags';
1032
1033                 if ( isset( $row->$flagsField ) ) {
1034                         $flags = explode( ',', $row->$flagsField );
1035                 } else {
1036                         $flags = [];
1037                 }
1038
1039                 if ( isset( $row->$textField ) ) {
1040                         $text = $row->$textField;
1041                 } else {
1042                         return false;
1043                 }
1044
1045                 $cacheKey = isset( $row->old_id ) ? ( 'tt:' . $row->old_id ) : null;
1046
1047                 return self::getBlobStore( $wiki )->expandBlob( $text, $flags, $cacheKey );
1048         }
1049
1050         /**
1051          * If $wgCompressRevisions is enabled, we will compress data.
1052          * The input string is modified in place.
1053          * Return value is the flags field: contains 'gzip' if the
1054          * data is compressed, and 'utf-8' if we're saving in UTF-8
1055          * mode.
1056          *
1057          * @param mixed &$text Reference to a text
1058          * @return string
1059          */
1060         public static function compressRevisionText( &$text ) {
1061                 return self::getBlobStore()->compressData( $text );
1062         }
1063
1064         /**
1065          * Re-converts revision text according to it's flags.
1066          *
1067          * @param mixed $text Reference to a text
1068          * @param array $flags Compression flags
1069          * @return string|bool Decompressed text, or false on failure
1070          */
1071         public static function decompressRevisionText( $text, $flags ) {
1072                 return self::getBlobStore()->decompressData( $text, $flags );
1073         }
1074
1075         /**
1076          * Insert a new revision into the database, returning the new revision ID
1077          * number on success and dies horribly on failure.
1078          *
1079          * @param IDatabase $dbw (master connection)
1080          * @throws MWException
1081          * @return int The revision ID
1082          */
1083         public function insertOn( $dbw ) {
1084                 global $wgUser;
1085
1086                 // Note that $this->mRecord->getId() will typically return null here, but not always,
1087                 // e.g. not when restoring a revision.
1088
1089                 if ( $this->mRecord->getUser( RevisionRecord::RAW ) === null ) {
1090                         if ( $this->mRecord instanceof MutableRevisionRecord ) {
1091                                 $this->mRecord->setUser( $wgUser );
1092                         } else {
1093                                 throw new MWException( 'Cannot insert revision with no associated user.' );
1094                         }
1095                 }
1096
1097                 $rec = self::getRevisionStore()->insertRevisionOn( $this->mRecord, $dbw );
1098
1099                 $this->mRecord = $rec;
1100
1101                 // Avoid PHP 7.1 warning of passing $this by reference
1102                 $revision = $this;
1103                 // TODO: hard-deprecate in 1.32 (or even 1.31?)
1104                 Hooks::run( 'RevisionInsertComplete', [ &$revision, null, null ] );
1105
1106                 return $rec->getId();
1107         }
1108
1109         /**
1110          * Get the base 36 SHA-1 value for a string of text
1111          * @param string $text
1112          * @return string
1113          */
1114         public static function base36Sha1( $text ) {
1115                 return SlotRecord::base36Sha1( $text );
1116         }
1117
1118         /**
1119          * Create a new null-revision for insertion into a page's
1120          * history. This will not re-save the text, but simply refer
1121          * to the text from the previous version.
1122          *
1123          * Such revisions can for instance identify page rename
1124          * operations and other such meta-modifications.
1125          *
1126          * @param IDatabase $dbw
1127          * @param int $pageId ID number of the page to read from
1128          * @param string $summary Revision's summary
1129          * @param bool $minor Whether the revision should be considered as minor
1130          * @param User|null $user User object to use or null for $wgUser
1131          * @return Revision|null Revision or null on error
1132          */
1133         public static function newNullRevision( $dbw, $pageId, $summary, $minor, $user = null ) {
1134                 global $wgUser;
1135                 if ( !$user ) {
1136                         $user = $wgUser;
1137                 }
1138
1139                 $comment = CommentStoreComment::newUnsavedComment( $summary, null );
1140
1141                 $title = Title::newFromID( $pageId, Title::GAID_FOR_UPDATE );
1142                 if ( $title === null ) {
1143                         return null;
1144                 }
1145
1146                 $rec = self::getRevisionStore()->newNullRevision( $dbw, $title, $comment, $minor, $user );
1147
1148                 return new Revision( $rec );
1149         }
1150
1151         /**
1152          * Determine if the current user is allowed to view a particular
1153          * field of this revision, if it's marked as deleted.
1154          *
1155          * @param int $field One of self::DELETED_TEXT,
1156          *                              self::DELETED_COMMENT,
1157          *                              self::DELETED_USER
1158          * @param User|null $user User object to check, or null to use $wgUser
1159          * @return bool
1160          */
1161         public function userCan( $field, User $user = null ) {
1162                 return self::userCanBitfield( $this->getVisibility(), $field, $user );
1163         }
1164
1165         /**
1166          * Determine if the current user is allowed to view a particular
1167          * field of this revision, if it's marked as deleted. This is used
1168          * by various classes to avoid duplication.
1169          *
1170          * @param int $bitfield Current field
1171          * @param int $field One of self::DELETED_TEXT = File::DELETED_FILE,
1172          *                               self::DELETED_COMMENT = File::DELETED_COMMENT,
1173          *                               self::DELETED_USER = File::DELETED_USER
1174          * @param User|null $user User object to check, or null to use $wgUser
1175          * @param Title|null $title A Title object to check for per-page restrictions on,
1176          *                          instead of just plain userrights
1177          * @return bool
1178          */
1179         public static function userCanBitfield( $bitfield, $field, User $user = null,
1180                 Title $title = null
1181         ) {
1182                 global $wgUser;
1183
1184                 if ( !$user ) {
1185                         $user = $wgUser;
1186                 }
1187
1188                 return RevisionRecord::userCanBitfield( $bitfield, $field, $user, $title );
1189         }
1190
1191         /**
1192          * Get rev_timestamp from rev_id, without loading the rest of the row
1193          *
1194          * @param Title $title
1195          * @param int $id
1196          * @param int $flags
1197          * @return string|bool False if not found
1198          */
1199         static function getTimestampFromId( $title, $id, $flags = 0 ) {
1200                 return self::getRevisionStore()->getTimestampFromId( $title, $id, $flags );
1201         }
1202
1203         /**
1204          * Get count of revisions per page...not very efficient
1205          *
1206          * @param IDatabase $db
1207          * @param int $id Page id
1208          * @return int
1209          */
1210         static function countByPageId( $db, $id ) {
1211                 return self::getRevisionStore()->countRevisionsByPageId( $db, $id );
1212         }
1213
1214         /**
1215          * Get count of revisions per page...not very efficient
1216          *
1217          * @param IDatabase $db
1218          * @param Title $title
1219          * @return int
1220          */
1221         static function countByTitle( $db, $title ) {
1222                 return self::getRevisionStore()->countRevisionsByTitle( $db, $title );
1223         }
1224
1225         /**
1226          * Check if no edits were made by other users since
1227          * the time a user started editing the page. Limit to
1228          * 50 revisions for the sake of performance.
1229          *
1230          * @since 1.20
1231          * @deprecated since 1.24
1232          *
1233          * @param IDatabase|int $db The Database to perform the check on. May be given as a
1234          *        Database object or a database identifier usable with wfGetDB.
1235          * @param int $pageId The ID of the page in question
1236          * @param int $userId The ID of the user in question
1237          * @param string $since Look at edits since this time
1238          *
1239          * @return bool True if the given user was the only one to edit since the given timestamp
1240          */
1241         public static function userWasLastToEdit( $db, $pageId, $userId, $since ) {
1242                 if ( is_int( $db ) ) {
1243                         $db = wfGetDB( $db );
1244                 }
1245
1246                 return self::getRevisionStore()->userWasLastToEdit( $db, $pageId, $userId, $since );
1247         }
1248
1249         /**
1250          * Load a revision based on a known page ID and current revision ID from the DB
1251          *
1252          * This method allows for the use of caching, though accessing anything that normally
1253          * requires permission checks (aside from the text) will trigger a small DB lookup.
1254          * The title will also be loaded if $pageIdOrTitle is an integer ID.
1255          *
1256          * @param IDatabase $db ignored!
1257          * @param int|Title $pageIdOrTitle Page ID or Title object
1258          * @param int $revId Known current revision of this page. Determined automatically if not given.
1259          * @return Revision|bool Returns false if missing
1260          * @since 1.28
1261          */
1262         public static function newKnownCurrent( IDatabase $db, $pageIdOrTitle, $revId = 0 ) {
1263                 $title = $pageIdOrTitle instanceof Title
1264                         ? $pageIdOrTitle
1265                         : Title::newFromID( $pageIdOrTitle );
1266
1267                 if ( !$title ) {
1268                         return false;
1269                 }
1270
1271                 $record = self::getRevisionLookup()->getKnownCurrentRevision( $title, $revId );
1272                 return $record ? new Revision( $record ) : false;
1273         }
1274 }