includes/MovePage.php

   1 <?php
   2
   3 /**
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  * http://www.gnu.org/copyleft/gpl.html
  18  *
  19  * @file
  20  */
  21
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Revision\SlotRecord;
  24 use Wikimedia\Rdbms\IDatabase;
  25
  26 /**
  27  * Handles the backend logic of moving a page from one title
  28  * to another.
  29  *
  30  * @since 1.24
  31  */
  32 class MovePage {
  33
  34         /**
  35          * @var Title
  36          */
  37         protected $oldTitle;
  38
  39         /**
  40          * @var Title
  41          */
  42         protected $newTitle;
  43
  44         public function __construct( Title $oldTitle, Title $newTitle ) {
  45                 $this->oldTitle = $oldTitle;
  46                 $this->newTitle = $newTitle;
  47         }
  48
  49         /**
  50          * Check if the user is allowed to perform the move.
  51          *
  52          * @param User $user
  53          * @param string|null $reason To check against summary spam regex. Set to null to skip the check,
  54          *   for instance to display errors preemptively before the user has filled in a summary.
  55          * @return Status
  56          */
  57         public function checkPermissions( User $user, $reason ) {
  58                 $status = new Status();
  59
  60                 $errors = wfMergeErrorArrays(
  61                         $this->oldTitle->getUserPermissionsErrors( 'move', $user ),
  62                         $this->oldTitle->getUserPermissionsErrors( 'edit', $user ),
  63                         $this->newTitle->getUserPermissionsErrors( 'move-target', $user ),
  64                         $this->newTitle->getUserPermissionsErrors( 'edit', $user )
  65                 );
  66
  67                 // Convert into a Status object
  68                 if ( $errors ) {
  69                         foreach ( $errors as $error ) {
  70                                 $status->fatal( ...$error );
  71                         }
  72                 }
  73
  74                 if ( $reason !== null && EditPage::matchSummarySpamRegex( $reason ) !== false ) {
  75                         // This is kind of lame, won't display nice
  76                         $status->fatal( 'spamprotectiontext' );
  77                 }
  78
  79                 $tp = $this->newTitle->getTitleProtection();
  80                 $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
  81                 if ( $tp !== false && !$permissionManager->userHasRight( $user, $tp['permission'] ) ) {
  82                         $status->fatal( 'cantmove-titleprotected' );
  83                 }
  84
  85                 Hooks::run( 'MovePageCheckPermissions',
  86                         [ $this->oldTitle, $this->newTitle, $user, $reason, $status ]
  87                 );
  88
  89                 return $status;
  90         }
  91
  92         /**
  93          * Does various sanity checks that the move is
  94          * valid. Only things based on the two titles
  95          * should be checked here.
  96          *
  97          * @return Status
  98          */
  99         public function isValidMove() {
 100                 global $wgContentHandlerUseDB;
 101                 $status = new Status();
 102
 103                 if ( $this->oldTitle->equals( $this->newTitle ) ) {
 104                         $status->fatal( 'selfmove' );
 105                 }
 106                 if ( !$this->oldTitle->isMovable() ) {
 107                         $status->fatal( 'immobile-source-namespace', $this->oldTitle->getNsText() );
 108                 }
 109                 if ( $this->newTitle->isExternal() ) {
 110                         $status->fatal( 'immobile-target-namespace-iw' );
 111                 }
 112                 if ( !$this->newTitle->isMovable() ) {
 113                         $status->fatal( 'immobile-target-namespace', $this->newTitle->getNsText() );
 114                 }
 115
 116                 $oldid = $this->oldTitle->getArticleID();
 117
 118                 if ( $this->newTitle->getDBkey() === '' ) {
 119                         $status->fatal( 'articleexists' );
 120                 }
 121                 if (
 122                         ( $this->oldTitle->getDBkey() == '' ) ||
 123                         ( !$oldid ) ||
 124                         ( $this->newTitle->getDBkey() == '' )
 125                 ) {
 126                         $status->fatal( 'badarticleerror' );
 127                 }
 128
 129                 # The move is allowed only if (1) the target doesn't exist, or
 130                 # (2) the target is a redirect to the source, and has no history
 131                 # (so we can undo bad moves right after they're done).
 132                 if ( $this->newTitle->getArticleID() && !$this->isValidMoveTarget() ) {
 133                         $status->fatal( 'articleexists' );
 134                 }
 135
 136                 // Content model checks
 137                 if ( !$wgContentHandlerUseDB &&
 138                         $this->oldTitle->getContentModel() !== $this->newTitle->getContentModel() ) {
 139                         // can't move a page if that would change the page's content model
 140                         $status->fatal(
 141                                 'bad-target-model',
 142                                 ContentHandler::getLocalizedName( $this->oldTitle->getContentModel() ),
 143                                 ContentHandler::getLocalizedName( $this->newTitle->getContentModel() )
 144                         );
 145                 } elseif (
 146                         !ContentHandler::getForTitle( $this->oldTitle )->canBeUsedOn( $this->newTitle )
 147                 ) {
 148                         $status->fatal(
 149                                 'content-not-allowed-here',
 150                                 ContentHandler::getLocalizedName( $this->oldTitle->getContentModel() ),
 151                                 $this->newTitle->getPrefixedText(),
 152                                 SlotRecord::MAIN
 153                         );
 154                 }
 155
 156                 // Image-specific checks
 157                 if ( $this->oldTitle->inNamespace( NS_FILE ) ) {
 158                         $status->merge( $this->isValidFileMove() );
 159                 }
 160
 161                 if ( $this->newTitle->inNamespace( NS_FILE ) && !$this->oldTitle->inNamespace( NS_FILE ) ) {
 162                         $status->fatal( 'nonfile-cannot-move-to-file' );
 163                 }
 164
 165                 // Hook for extensions to say a title can't be moved for technical reasons
 166                 Hooks::run( 'MovePageIsValidMove', [ $this->oldTitle, $this->newTitle, $status ] );
 167
 168                 return $status;
 169         }
 170
 171         /**
 172          * Sanity checks for when a file is being moved
 173          *
 174          * @return Status
 175          */
 176         protected function isValidFileMove() {
 177                 $status = new Status();
 178                 $file = wfLocalFile( $this->oldTitle );
 179                 $file->load( File::READ_LATEST );
 180                 if ( $file->exists() ) {
 181                         if ( $this->newTitle->getText() != wfStripIllegalFilenameChars( $this->newTitle->getText() ) ) {
 182                                 $status->fatal( 'imageinvalidfilename' );
 183                         }
 184                         if ( !File::checkExtensionCompatibility( $file, $this->newTitle->getDBkey() ) ) {
 185                                 $status->fatal( 'imagetypemismatch' );
 186                         }
 187                 }
 188
 189                 if ( !$this->newTitle->inNamespace( NS_FILE ) ) {
 190                         $status->fatal( 'imagenocrossnamespace' );
 191                 }
 192
 193                 return $status;
 194         }
 195
 196         /**
 197          * Checks if $this can be moved to a given Title
 198          * - Selects for update, so don't call it unless you mean business
 199          *
 200          * @since 1.25
 201          * @return bool
 202          */
 203         protected function isValidMoveTarget() {
 204                 # Is it an existing file?
 205                 if ( $this->newTitle->inNamespace( NS_FILE ) ) {
 206                         $file = wfLocalFile( $this->newTitle );
 207                         $file->load( File::READ_LATEST );
 208                         if ( $file->exists() ) {
 209                                 wfDebug( __METHOD__ . ": file exists\n" );
 210                                 return false;
 211                         }
 212                 }
 213                 # Is it a redirect with no history?
 214                 if ( !$this->newTitle->isSingleRevRedirect() ) {
 215                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
 216                         return false;
 217                 }
 218                 # Get the article text
 219                 $rev = Revision::newFromTitle( $this->newTitle, false, Revision::READ_LATEST );
 220                 if ( !is_object( $rev ) ) {
 221                         return false;
 222                 }
 223                 $content = $rev->getContent();
 224                 # Does the redirect point to the source?
 225                 # Or is it a broken self-redirect, usually caused by namespace collisions?
 226                 $redirTitle = $content ? $content->getRedirectTarget() : null;
 227
 228                 if ( $redirTitle ) {
 229                         if ( $redirTitle->getPrefixedDBkey() !== $this->oldTitle->getPrefixedDBkey() &&
 230                                 $redirTitle->getPrefixedDBkey() !== $this->newTitle->getPrefixedDBkey() ) {
 231                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
 232                                 return false;
 233                         } else {
 234                                 return true;
 235                         }
 236                 } else {
 237                         # Fail safe (not a redirect after all. strange.)
 238                         wfDebug( __METHOD__ . ": failsafe: database says " . $this->newTitle->getPrefixedDBkey() .
 239                                 " is a redirect, but it doesn't contain a valid redirect.\n" );
 240                         return false;
 241                 }
 242         }
 243
 244         /**
 245          * Move a page without taking user permissions into account. Only checks if the move is itself
 246          * invalid, e.g., trying to move a special page or trying to move a page onto one that already
 247          * exists.
 248          *
 249          * @param User $user
 250          * @param string|null $reason
 251          * @param bool|null $createRedirect
 252          * @param string[] $changeTags Change tags to apply to the entry in the move log
 253          * @return Status
 254          */
 255         public function move(
 256                 User $user, $reason = null, $createRedirect = true, array $changeTags = []
 257         ) {
 258                 $status = $this->isValidMove();
 259                 if ( !$status->isOK() ) {
 260                         return $status;
 261                 }
 262
 263                 return $this->moveUnsafe( $user, $reason, $createRedirect, $changeTags );
 264         }
 265
 266         /**
 267          * Same as move(), but with permissions checks.
 268          *
 269          * @param User $user
 270          * @param string|null $reason
 271          * @param bool|null $createRedirect Ignored if user doesn't have suppressredirect permission
 272          * @param string[] $changeTags Change tags to apply to the entry in the move log
 273          * @return Status
 274          */
 275         public function moveIfAllowed(
 276                 User $user, $reason = null, $createRedirect = true, array $changeTags = []
 277         ) {
 278                 $status = $this->isValidMove();
 279                 $status->merge( $this->checkPermissions( $user, $reason ) );
 280                 if ( $changeTags ) {
 281                         $status->merge( ChangeTags::canAddTagsAccompanyingChange( $changeTags, $user ) );
 282                 }
 283
 284                 if ( !$status->isOK() ) {
 285                         // Auto-block user's IP if the account was "hard" blocked
 286                         $user->spreadAnyEditBlock();
 287                         return $status;
 288                 }
 289
 290                 // Check suppressredirect permission
 291                 $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
 292                 if ( !$permissionManager->userHasRight( $user, 'suppressredirect' ) ) {
 293                         $createRedirect = true;
 294                 }
 295
 296                 return $this->moveUnsafe( $user, $reason, $createRedirect, $changeTags );
 297         }
 298
 299         /**
 300          * Move the source page's subpages to be subpages of the target page, without checking user
 301          * permissions. The caller is responsible for moving the source page itself. We will still not
 302          * do moves that are inherently not allowed, nor will we move more than $wgMaximumMovedPages.
 303          *
 304          * @param User $user
 305          * @param string|null $reason The reason for the move
 306          * @param bool|null $createRedirect Whether to create redirects from the old subpages to
 307          *  the new ones
 308          * @param string[] $changeTags Applied to entries in the move log and redirect page revision
 309          * @return Status Good if no errors occurred. Ok if at least one page succeeded. The "value"
 310          *  of the top-level status is an array containing the per-title status for each page. For any
 311          *  move that succeeded, the "value" of the per-title status is the new page title.
 312          */
 313         public function moveSubpages(
 314                 User $user, $reason = null, $createRedirect = true, array $changeTags = []
 315         ) {
 316                 return $this->moveSubpagesInternal( false, $user, $reason, $createRedirect, $changeTags );
 317         }
 318
 319         /**
 320          * Move the source page's subpages to be subpages of the target page, with user permission
 321          * checks. The caller is responsible for moving the source page itself.
 322          *
 323          * @param User $user
 324          * @param string|null $reason The reason for the move
 325          * @param bool|null $createRedirect Whether to create redirects from the old subpages to
 326          *  the new ones. Ignored if the user doesn't have the 'suppressredirect' right.
 327          * @param string[] $changeTags Applied to entries in the move log and redirect page revision
 328          * @return Status Good if no errors occurred. Ok if at least one page succeeded. The "value"
 329          *  of the top-level status is an array containing the per-title status for each page. For any
 330          *  move that succeeded, the "value" of the per-title status is the new page title.
 331          */
 332         public function moveSubpagesIfAllowed(
 333                 User $user, $reason = null, $createRedirect = true, array $changeTags = []
 334         ) {
 335                 return $this->moveSubpagesInternal( true, $user, $reason, $createRedirect, $changeTags );
 336         }
 337
 338         /**
 339          * @param bool $checkPermissions
 340          * @param User $user
 341          * @param string $reason
 342          * @param bool $createRedirect
 343          * @param array $changeTags
 344          * @return Status
 345          */
 346         private function moveSubpagesInternal(
 347                 $checkPermissions, User $user, $reason, $createRedirect, array $changeTags
 348         ) {
 349                 global $wgMaximumMovedPages;
 350                 $services = MediaWikiServices::getInstance();
 351
 352                 if ( $checkPermissions ) {
 353                         if ( !$services->getPermissionManager()->userCan(
 354                                 'move-subpages', $user, $this->oldTitle )
 355                         ) {
 356                                 return Status::newFatal( 'cant-move-subpages' );
 357                         }
 358                 }
 359
 360                 $nsInfo = $services->getNamespaceInfo();
 361
 362                 // Do the source and target namespaces support subpages?
 363                 if ( !$nsInfo->hasSubpages( $this->oldTitle->getNamespace() ) ) {
 364                         return Status::newFatal( 'namespace-nosubpages',
 365                                 $nsInfo->getCanonicalName( $this->oldTitle->getNamespace() ) );
 366                 }
 367                 if ( !$nsInfo->hasSubpages( $this->newTitle->getNamespace() ) ) {
 368                         return Status::newFatal( 'namespace-nosubpages',
 369                                 $nsInfo->getCanonicalName( $this->newTitle->getNamespace() ) );
 370                 }
 371
 372                 // Return a status for the overall result. Its value will be an array with per-title
 373                 // status for each subpage. Merge any errors from the per-title statuses into the
 374                 // top-level status without resetting the overall result.
 375                 $topStatus = Status::newGood();
 376                 $perTitleStatus = [];
 377                 $subpages = $this->oldTitle->getSubpages( $wgMaximumMovedPages + 1 );
 378                 $count = 0;
 379                 foreach ( $subpages as $oldSubpage ) {
 380                         $count++;
 381                         if ( $count > $wgMaximumMovedPages ) {
 382                                 $status = Status::newFatal( 'movepage-max-pages', $wgMaximumMovedPages );
 383                                 $perTitleStatus[$oldSubpage->getPrefixedText()] = $status;
 384                                 $topStatus->merge( $status );
 385                                 $topStatus->setOk( true );
 386                                 break;
 387                         }
 388
 389                         // We don't know whether this function was called before or after moving the root page,
 390                         // so check both titles
 391                         if ( $oldSubpage->getArticleID() == $this->oldTitle->getArticleID() ||
 392                                 $oldSubpage->getArticleID() == $this->newTitle->getArticleID()
 393                         ) {
 394                                 // When moving a page to a subpage of itself, don't move it twice
 395                                 continue;
 396                         }
 397                         $newPageName = preg_replace(
 398                                         '#^' . preg_quote( $this->oldTitle->getDBkey(), '#' ) . '#',
 399                                         StringUtils::escapeRegexReplacement( $this->newTitle->getDBkey() ), # T23234
 400                                         $oldSubpage->getDBkey() );
 401                         if ( $oldSubpage->isTalkPage() ) {
 402                                 $newNs = $this->newTitle->getTalkPage()->getNamespace();
 403                         } else {
 404                                 $newNs = $this->newTitle->getSubjectPage()->getNamespace();
 405                         }
 406                         // T16385: we need makeTitleSafe because the new page names may be longer than 255
 407                         // characters.
 408                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
 409
 410                         $mp = new MovePage( $oldSubpage, $newSubpage );
 411                         $method = $checkPermissions ? 'moveIfAllowed' : 'move';
 412                         $status = $mp->$method( $user, $reason, $createRedirect, $changeTags );
 413                         if ( $status->isOK() ) {
 414                                 $status->setResult( true, $newSubpage->getPrefixedText() );
 415                         }
 416                         $perTitleStatus[$oldSubpage->getPrefixedText()] = $status;
 417                         $topStatus->merge( $status );
 418                         $topStatus->setOk( true );
 419                 }
 420
 421                 $topStatus->value = $perTitleStatus;
 422                 return $topStatus;
 423         }
 424
 425         /**
 426          * Moves *without* any sort of safety or sanity checks. Hooks can still fail the move, however.
 427          *
 428          * @param User $user
 429          * @param string $reason
 430          * @param bool $createRedirect
 431          * @param string[] $changeTags Change tags to apply to the entry in the move log
 432          * @return Status
 433          */
 434         private function moveUnsafe( User $user, $reason, $createRedirect, array $changeTags ) {
 435                 global $wgCategoryCollation;
 436
 437                 $status = Status::newGood();
 438                 Hooks::run( 'TitleMove', [ $this->oldTitle, $this->newTitle, $user, $reason, &$status ] );
 439                 if ( !$status->isOK() ) {
 440                         // Move was aborted by the hook
 441                         return $status;
 442                 }
 443
 444                 $dbw = wfGetDB( DB_MASTER );
 445                 $dbw->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
 446
 447                 Hooks::run( 'TitleMoveStarting', [ $this->oldTitle, $this->newTitle, $user ] );
 448
 449                 $pageid = $this->oldTitle->getArticleID( Title::GAID_FOR_UPDATE );
 450                 $protected = $this->oldTitle->isProtected();
 451
 452                 // Do the actual move; if this fails, it will throw an MWException(!)
 453                 $nullRevision = $this->moveToInternal( $user, $this->newTitle, $reason, $createRedirect,
 454                         $changeTags );
 455
 456                 // Refresh the sortkey for this row.  Be careful to avoid resetting
 457                 // cl_timestamp, which may disturb time-based lists on some sites.
 458                 // @todo This block should be killed, it's duplicating code
 459                 // from LinksUpdate::getCategoryInsertions() and friends.
 460                 $prefixes = $dbw->select(
 461                         'categorylinks',
 462                         [ 'cl_sortkey_prefix', 'cl_to' ],
 463                         [ 'cl_from' => $pageid ],
 464                         __METHOD__
 465                 );
 466                 $services = MediaWikiServices::getInstance();
 467                 $type = $services->getNamespaceInfo()->
 468                         getCategoryLinkType( $this->newTitle->getNamespace() );
 469                 foreach ( $prefixes as $prefixRow ) {
 470                         $prefix = $prefixRow->cl_sortkey_prefix;
 471                         $catTo = $prefixRow->cl_to;
 472                         $dbw->update( 'categorylinks',
 473                                 [
 474                                         'cl_sortkey' => Collation::singleton()->getSortKey(
 475                                                         $this->newTitle->getCategorySortkey( $prefix ) ),
 476                                         'cl_collation' => $wgCategoryCollation,
 477                                         'cl_type' => $type,
 478                                         'cl_timestamp=cl_timestamp' ],
 479                                 [
 480                                         'cl_from' => $pageid,
 481                                         'cl_to' => $catTo ],
 482                                 __METHOD__
 483                         );
 484                 }
 485
 486                 $redirid = $this->oldTitle->getArticleID();
 487
 488                 if ( $protected ) {
 489                         # Protect the redirect title as the title used to be...
 490                         $res = $dbw->select(
 491                                 'page_restrictions',
 492                                 [ 'pr_type', 'pr_level', 'pr_cascade', 'pr_user', 'pr_expiry' ],
 493                                 [ 'pr_page' => $pageid ],
 494                                 __METHOD__,
 495                                 'FOR UPDATE'
 496                         );
 497                         $rowsInsert = [];
 498                         foreach ( $res as $row ) {
 499                                 $rowsInsert[] = [
 500                                         'pr_page' => $redirid,
 501                                         'pr_type' => $row->pr_type,
 502                                         'pr_level' => $row->pr_level,
 503                                         'pr_cascade' => $row->pr_cascade,
 504                                         'pr_user' => $row->pr_user,
 505                                         'pr_expiry' => $row->pr_expiry
 506                                 ];
 507                         }
 508                         $dbw->insert( 'page_restrictions', $rowsInsert, __METHOD__, [ 'IGNORE' ] );
 509
 510                         // Build comment for log
 511                         $comment = wfMessage(
 512                                 'prot_1movedto2',
 513                                 $this->oldTitle->getPrefixedText(),
 514                                 $this->newTitle->getPrefixedText()
 515                         )->inContentLanguage()->text();
 516                         if ( $reason ) {
 517                                 $comment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
 518                         }
 519
 520                         // reread inserted pr_ids for log relation
 521                         $insertedPrIds = $dbw->select(
 522                                 'page_restrictions',
 523                                 'pr_id',
 524                                 [ 'pr_page' => $redirid ],
 525                                 __METHOD__
 526                         );
 527                         $logRelationsValues = [];
 528                         foreach ( $insertedPrIds as $prid ) {
 529                                 $logRelationsValues[] = $prid->pr_id;
 530                         }
 531
 532                         // Update the protection log
 533                         $logEntry = new ManualLogEntry( 'protect', 'move_prot' );
 534                         $logEntry->setTarget( $this->newTitle );
 535                         $logEntry->setComment( $comment );
 536                         $logEntry->setPerformer( $user );
 537                         $logEntry->setParameters( [
 538                                 '4::oldtitle' => $this->oldTitle->getPrefixedText(),
 539                         ] );
 540                         $logEntry->setRelations( [ 'pr_id' => $logRelationsValues ] );
 541                         $logEntry->setTags( $changeTags );
 542                         $logId = $logEntry->insert();
 543                         $logEntry->publish( $logId );
 544                 }
 545
 546                 // Update *_from_namespace fields as needed
 547                 if ( $this->oldTitle->getNamespace() != $this->newTitle->getNamespace() ) {
 548                         $dbw->update( 'pagelinks',
 549                                 [ 'pl_from_namespace' => $this->newTitle->getNamespace() ],
 550                                 [ 'pl_from' => $pageid ],
 551                                 __METHOD__
 552                         );
 553                         $dbw->update( 'templatelinks',
 554                                 [ 'tl_from_namespace' => $this->newTitle->getNamespace() ],
 555                                 [ 'tl_from' => $pageid ],
 556                                 __METHOD__
 557                         );
 558                         $dbw->update( 'imagelinks',
 559                                 [ 'il_from_namespace' => $this->newTitle->getNamespace() ],
 560                                 [ 'il_from' => $pageid ],
 561                                 __METHOD__
 562                         );
 563                 }
 564
 565                 # Update watchlists
 566                 $oldtitle = $this->oldTitle->getDBkey();
 567                 $newtitle = $this->newTitle->getDBkey();
 568                 $oldsnamespace = $services->getNamespaceInfo()->
 569                         getSubject( $this->oldTitle->getNamespace() );
 570                 $newsnamespace = $services->getNamespaceInfo()->
 571                         getSubject( $this->newTitle->getNamespace() );
 572                 if ( $oldsnamespace != $newsnamespace || $oldtitle != $newtitle ) {
 573                         $services->getWatchedItemStore()->duplicateAllAssociatedEntries(
 574                                 $this->oldTitle, $this->newTitle );
 575                 }
 576
 577                 // If it is a file then move it last.
 578                 // This is done after all database changes so that file system errors cancel the transaction.
 579                 if ( $this->oldTitle->getNamespace() == NS_FILE ) {
 580                         $status = $this->moveFile( $this->oldTitle, $this->newTitle );
 581                         if ( !$status->isOK() ) {
 582                                 $dbw->cancelAtomic( __METHOD__ );
 583                                 return $status;
 584                         }
 585                 }
 586
 587                 Hooks::run(
 588                         'TitleMoveCompleting',
 589                         [ $this->oldTitle, $this->newTitle,
 590                                 $user, $pageid, $redirid, $reason, $nullRevision ]
 591                 );
 592
 593                 $dbw->endAtomic( __METHOD__ );
 594
 595                 $params = [
 596                         &$this->oldTitle,
 597                         &$this->newTitle,
 598                         &$user,
 599                         $pageid,
 600                         $redirid,
 601                         $reason,
 602                         $nullRevision
 603                 ];
 604                 // Keep each single hook handler atomic
 605                 DeferredUpdates::addUpdate(
 606                         new AtomicSectionUpdate(
 607                                 $dbw,
 608                                 __METHOD__,
 609                                 // Hold onto $user to avoid HHVM bug where it no longer
 610                                 // becomes a reference (T118683)
 611                                 function () use ( $params, &$user ) {
 612                                         Hooks::run( 'TitleMoveComplete', $params );
 613                                 }
 614                         )
 615                 );
 616
 617                 return Status::newGood();
 618         }
 619
 620         /**
 621          * Move a file associated with a page to a new location.
 622          * Can also be used to revert after a DB failure.
 623          *
 624          * @private
 625          * @param Title $oldTitle Old location to move the file from.
 626          * @param Title $newTitle New location to move the file to.
 627          * @return Status
 628          */
 629         private function moveFile( $oldTitle, $newTitle ) {
 630                 $status = Status::newFatal(
 631                         'cannotdelete',
 632                         $oldTitle->getPrefixedText()
 633                 );
 634
 635                 $file = wfLocalFile( $oldTitle );
 636                 $file->load( File::READ_LATEST );
 637                 if ( $file->exists() ) {
 638                         $status = $file->move( $newTitle );
 639                 }
 640
 641                 // Clear RepoGroup process cache
 642                 RepoGroup::singleton()->clearCache( $oldTitle );
 643                 RepoGroup::singleton()->clearCache( $newTitle ); # clear false negative cache
 644                 return $status;
 645         }
 646
 647         /**
 648          * Move page to a title which is either a redirect to the
 649          * source page or nonexistent
 650          *
 651          * @todo This was basically directly moved from Title, it should be split into
 652          *   smaller functions
 653          * @param User $user the User doing the move
 654          * @param Title $nt The page to move to, which should be a redirect or non-existent
 655          * @param string $reason The reason for the move
 656          * @param bool $createRedirect Whether to leave a redirect at the old title. Does not check
 657          *   if the user has the suppressredirect right
 658          * @param string[] $changeTags Change tags to apply to the entry in the move log
 659          * @return Revision the revision created by the move
 660          * @throws MWException
 661          */
 662         private function moveToInternal( User $user, &$nt, $reason = '', $createRedirect = true,
 663                 array $changeTags = []
 664         ) {
 665                 if ( $nt->exists() ) {
 666                         $moveOverRedirect = true;
 667                         $logType = 'move_redir';
 668                 } else {
 669                         $moveOverRedirect = false;
 670                         $logType = 'move';
 671                 }
 672
 673                 if ( $moveOverRedirect ) {
 674                         $overwriteMessage = wfMessage(
 675                                         'delete_and_move_reason',
 676                                         $this->oldTitle->getPrefixedText()
 677                                 )->inContentLanguage()->text();
 678                         $newpage = WikiPage::factory( $nt );
 679                         $errs = [];
 680                         $status = $newpage->doDeleteArticleReal(
 681                                 $overwriteMessage,
 682                                 /* $suppress */ false,
 683                                 $nt->getArticleID(),
 684                                 /* $commit */ false,
 685                                 $errs,
 686                                 $user,
 687                                 $changeTags,
 688                                 'delete_redir'
 689                         );
 690
 691                         if ( !$status->isGood() ) {
 692                                 throw new MWException( 'Failed to delete page-move revision: '
 693                                         . $status->getWikiText( false, false, 'en' ) );
 694                         }
 695
 696                         $nt->resetArticleID( false );
 697                 }
 698
 699                 if ( $createRedirect ) {
 700                         if ( $this->oldTitle->getNamespace() == NS_CATEGORY
 701                                 && !wfMessage( 'category-move-redirect-override' )->inContentLanguage()->isDisabled()
 702                         ) {
 703                                 $redirectContent = new WikitextContent(
 704                                         wfMessage( 'category-move-redirect-override' )
 705                                                 ->params( $nt->getPrefixedText() )->inContentLanguage()->plain() );
 706                         } else {
 707                                 $contentHandler = ContentHandler::getForTitle( $this->oldTitle );
 708                                 $redirectContent = $contentHandler->makeRedirectContent( $nt,
 709                                         wfMessage( 'move-redirect-text' )->inContentLanguage()->plain() );
 710                         }
 711
 712                         // NOTE: If this page's content model does not support redirects, $redirectContent will be null.
 713                 } else {
 714                         $redirectContent = null;
 715                 }
 716
 717                 // Figure out whether the content model is no longer the default
 718                 $oldDefault = ContentHandler::getDefaultModelFor( $this->oldTitle );
 719                 $contentModel = $this->oldTitle->getContentModel();
 720                 $newDefault = ContentHandler::getDefaultModelFor( $nt );
 721                 $defaultContentModelChanging = ( $oldDefault !== $newDefault
 722                         && $oldDefault === $contentModel );
 723
 724                 // T59084: log_page should be the ID of the *moved* page
 725                 $oldid = $this->oldTitle->getArticleID();
 726                 $logTitle = clone $this->oldTitle;
 727
 728                 $logEntry = new ManualLogEntry( 'move', $logType );
 729                 $logEntry->setPerformer( $user );
 730                 $logEntry->setTarget( $logTitle );
 731                 $logEntry->setComment( $reason );
 732                 $logEntry->setParameters( [
 733                         '4::target' => $nt->getPrefixedText(),
 734                         '5::noredir' => $redirectContent ? '0' : '1',
 735                 ] );
 736
 737                 $formatter = LogFormatter::newFromEntry( $logEntry );
 738                 $formatter->setContext( RequestContext::newExtraneousContext( $this->oldTitle ) );
 739                 $comment = $formatter->getPlainActionText();
 740                 if ( $reason ) {
 741                         $comment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
 742                 }
 743
 744                 $dbw = wfGetDB( DB_MASTER );
 745
 746                 $oldpage = WikiPage::factory( $this->oldTitle );
 747                 $oldcountable = $oldpage->isCountable();
 748
 749                 $newpage = WikiPage::factory( $nt );
 750
 751                 # Change the name of the target page:
 752                 $dbw->update( 'page',
 753                         /* SET */ [
 754                                 'page_namespace' => $nt->getNamespace(),
 755                                 'page_title' => $nt->getDBkey(),
 756                         ],
 757                         /* WHERE */ [ 'page_id' => $oldid ],
 758                         __METHOD__
 759                 );
 760
 761                 # Save a null revision in the page's history notifying of the move
 762                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true, $user );
 763                 if ( !is_object( $nullRevision ) ) {
 764                         throw new MWException( 'Failed to create null revision while moving page ID '
 765                                 . $oldid . ' to ' . $nt->getPrefixedDBkey() );
 766                 }
 767
 768                 $nullRevId = $nullRevision->insertOn( $dbw );
 769                 $logEntry->setAssociatedRevId( $nullRevId );
 770
 771                 /**
 772                  * T163966
 773                  * Increment user_editcount during page moves
 774                  * Moved from SpecialMovepage.php per T195550
 775                  */
 776                 $user->incEditCount();
 777
 778                 if ( !$redirectContent ) {
 779                         // Clean up the old title *before* reset article id - T47348
 780                         WikiPage::onArticleDelete( $this->oldTitle );
 781                 }
 782
 783                 $this->oldTitle->resetArticleID( 0 ); // 0 == non existing
 784                 $nt->resetArticleID( $oldid );
 785                 $newpage->loadPageData( WikiPage::READ_LOCKING ); // T48397
 786
 787                 $newpage->updateRevisionOn( $dbw, $nullRevision );
 788
 789                 Hooks::run( 'NewRevisionFromEditComplete',
 790                         [ $newpage, $nullRevision, $nullRevision->getParentId(), $user ] );
 791
 792                 $newpage->doEditUpdates( $nullRevision, $user,
 793                         [ 'changed' => false, 'moved' => true, 'oldcountable' => $oldcountable ] );
 794
 795                 // If the default content model changes, we need to populate rev_content_model
 796                 if ( $defaultContentModelChanging ) {
 797                         $dbw->update(
 798                                 'revision',
 799                                 [ 'rev_content_model' => $contentModel ],
 800                                 [ 'rev_page' => $nt->getArticleID(), 'rev_content_model IS NULL' ],
 801                                 __METHOD__
 802                         );
 803                 }
 804
 805                 WikiPage::onArticleCreate( $nt );
 806
 807                 # Recreate the redirect, this time in the other direction.
 808                 if ( $redirectContent ) {
 809                         $redirectArticle = WikiPage::factory( $this->oldTitle );
 810                         $redirectArticle->loadFromRow( false, WikiPage::READ_LOCKING ); // T48397
 811                         $newid = $redirectArticle->insertOn( $dbw );
 812                         if ( $newid ) { // sanity
 813                                 $this->oldTitle->resetArticleID( $newid );
 814                                 $redirectRevision = new Revision( [
 815                                         'title' => $this->oldTitle, // for determining the default content model
 816                                         'page' => $newid,
 817                                         'user_text' => $user->getName(),
 818                                         'user' => $user->getId(),
 819                                         'comment' => $comment,
 820                                         'content' => $redirectContent ] );
 821                                 $redirectRevId = $redirectRevision->insertOn( $dbw );
 822                                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
 823
 824                                 Hooks::run( 'NewRevisionFromEditComplete',
 825                                         [ $redirectArticle, $redirectRevision, false, $user ] );
 826
 827                                 $redirectArticle->doEditUpdates( $redirectRevision, $user, [ 'created' => true ] );
 828
 829                                 // make a copy because of log entry below
 830                                 $redirectTags = $changeTags;
 831                                 if ( in_array( 'mw-new-redirect', ChangeTags::getSoftwareTags() ) ) {
 832                                         $redirectTags[] = 'mw-new-redirect';
 833                                 }
 834                                 ChangeTags::addTags( $redirectTags, null, $redirectRevId, null );
 835                         }
 836                 }
 837
 838                 # Log the move
 839                 $logid = $logEntry->insert();
 840
 841                 $logEntry->setTags( $changeTags );
 842                 $logEntry->publish( $logid );
 843
 844                 return $nullRevision;
 845         }
 846 }