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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Copyright © 2015 Geoffrey Mon <geofbot@gmail.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | * http://www.gnu.org/copyleft/gpl.html |
| 20 | * |
| 21 | * @file |
| 22 | */ |
| 23 | |
| 24 | namespace MediaWiki\Page; |
| 25 | |
| 26 | use Content; |
| 27 | use InvalidArgumentException; |
| 28 | use ManualLogEntry; |
| 29 | use MediaWiki; |
| 30 | use MediaWiki\CommentStore\CommentStoreComment; |
| 31 | use MediaWiki\Content\IContentHandlerFactory; |
| 32 | use MediaWiki\EditPage\SpamChecker; |
| 33 | use MediaWiki\HookContainer\HookContainer; |
| 34 | use MediaWiki\HookContainer\HookRunner; |
| 35 | use MediaWiki\Linker\LinkTargetLookup; |
| 36 | use MediaWiki\MainConfigNames; |
| 37 | use MediaWiki\MediaWikiServices; |
| 38 | use MediaWiki\Message\Message; |
| 39 | use MediaWiki\Permissions\Authority; |
| 40 | use MediaWiki\Permissions\PermissionStatus; |
| 41 | use MediaWiki\Revision\MutableRevisionRecord; |
| 42 | use MediaWiki\Revision\RevisionStore; |
| 43 | use MediaWiki\Revision\SlotRecord; |
| 44 | use MediaWiki\Status\Status; |
| 45 | use MediaWiki\Title\TitleFactory; |
| 46 | use MediaWiki\Title\TitleFormatter; |
| 47 | use MediaWiki\Title\TitleValue; |
| 48 | use MediaWiki\User\UserIdentity; |
| 49 | use MediaWiki\Utils\MWTimestamp; |
| 50 | use WatchedItemStoreInterface; |
| 51 | use Wikimedia\Rdbms\IConnectionProvider; |
| 52 | use Wikimedia\Rdbms\IDatabase; |
| 53 | use Wikimedia\Timestamp\TimestampException; |
| 54 | |
| 55 | /** |
| 56 | * Handles the backend logic of merging the histories of two |
| 57 | * pages. |
| 58 | * |
| 59 | * @since 1.27 |
| 60 | */ |
| 61 | class MergeHistory { |
| 62 | |
| 63 | /** Maximum number of revisions that can be merged at once */ |
| 64 | public const REVISION_LIMIT = 5000; |
| 65 | |
| 66 | /** @var PageIdentity Page from which history will be merged */ |
| 67 | protected $source; |
| 68 | |
| 69 | /** @var PageIdentity Page to which history will be merged */ |
| 70 | protected $dest; |
| 71 | |
| 72 | /** @var IDatabase Database that we are using */ |
| 73 | protected $dbw; |
| 74 | |
| 75 | /** @var ?string Timestamp up to which history from the source will be merged */ |
| 76 | private $timestamp; |
| 77 | |
| 78 | /** |
| 79 | * @var MWTimestamp|false Maximum timestamp that we can use (oldest timestamp of dest). |
| 80 | * Use ::getMaxTimestamp to lazily initialize. |
| 81 | */ |
| 82 | protected $maxTimestamp = false; |
| 83 | |
| 84 | /** |
| 85 | * @var string|false|null SQL WHERE condition that selects source revisions |
| 86 | * to insert into destination. Use ::getTimeWhere to lazy-initialize. |
| 87 | */ |
| 88 | protected $timeWhere = false; |
| 89 | |
| 90 | /** |
| 91 | * @var MWTimestamp|false|null Timestamp upto which history from the source will be merged. |
| 92 | * Use getTimestampLimit to lazily initialize. |
| 93 | */ |
| 94 | protected $timestampLimit = false; |
| 95 | |
| 96 | /** |
| 97 | * @var string|null |
| 98 | */ |
| 99 | private $revidLimit = null; |
| 100 | |
| 101 | /** @var int Number of revisions merged (for Special:MergeHistory success message) */ |
| 102 | protected $revisionsMerged; |
| 103 | |
| 104 | /** @var IContentHandlerFactory */ |
| 105 | private $contentHandlerFactory; |
| 106 | |
| 107 | /** @var RevisionStore */ |
| 108 | private $revisionStore; |
| 109 | |
| 110 | /** @var WatchedItemStoreInterface */ |
| 111 | private $watchedItemStore; |
| 112 | |
| 113 | /** @var SpamChecker */ |
| 114 | private $spamChecker; |
| 115 | |
| 116 | /** @var HookRunner */ |
| 117 | private $hookRunner; |
| 118 | |
| 119 | /** @var WikiPageFactory */ |
| 120 | private $wikiPageFactory; |
| 121 | |
| 122 | /** @var TitleFormatter */ |
| 123 | private $titleFormatter; |
| 124 | |
| 125 | /** @var TitleFactory */ |
| 126 | private $titleFactory; |
| 127 | private LinkTargetLookup $linkTargetLookup; |
| 128 | |
| 129 | /** |
| 130 | * @param PageIdentity $source Page from which history will be merged |
| 131 | * @param PageIdentity $dest Page to which history will be merged |
| 132 | * @param ?string $timestamp Timestamp up to which history from the source will be merged |
| 133 | * @param IConnectionProvider $dbProvider |
| 134 | * @param IContentHandlerFactory $contentHandlerFactory |
| 135 | * @param RevisionStore $revisionStore |
| 136 | * @param WatchedItemStoreInterface $watchedItemStore |
| 137 | * @param SpamChecker $spamChecker |
| 138 | * @param HookContainer $hookContainer |
| 139 | * @param WikiPageFactory $wikiPageFactory |
| 140 | * @param TitleFormatter $titleFormatter |
| 141 | * @param TitleFactory $titleFactory |
| 142 | * @param LinkTargetLookup $linkTargetLookup |
| 143 | */ |
| 144 | public function __construct( |
| 145 | PageIdentity $source, |
| 146 | PageIdentity $dest, |
| 147 | ?string $timestamp, |
| 148 | IConnectionProvider $dbProvider, |
| 149 | IContentHandlerFactory $contentHandlerFactory, |
| 150 | RevisionStore $revisionStore, |
| 151 | WatchedItemStoreInterface $watchedItemStore, |
| 152 | SpamChecker $spamChecker, |
| 153 | HookContainer $hookContainer, |
| 154 | WikiPageFactory $wikiPageFactory, |
| 155 | TitleFormatter $titleFormatter, |
| 156 | TitleFactory $titleFactory, |
| 157 | LinkTargetLookup $linkTargetLookup |
| 158 | ) { |
| 159 | // Save the parameters |
| 160 | $this->source = $source; |
| 161 | $this->dest = $dest; |
| 162 | $this->timestamp = $timestamp; |
| 163 | |
| 164 | // Get the database |
| 165 | $this->dbw = $dbProvider->getPrimaryDatabase(); |
| 166 | |
| 167 | $this->contentHandlerFactory = $contentHandlerFactory; |
| 168 | $this->revisionStore = $revisionStore; |
| 169 | $this->watchedItemStore = $watchedItemStore; |
| 170 | $this->spamChecker = $spamChecker; |
| 171 | $this->hookRunner = new HookRunner( $hookContainer ); |
| 172 | $this->wikiPageFactory = $wikiPageFactory; |
| 173 | $this->titleFormatter = $titleFormatter; |
| 174 | $this->titleFactory = $titleFactory; |
| 175 | $this->linkTargetLookup = $linkTargetLookup; |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Get the number of revisions that will be moved |
| 180 | * @return int |
| 181 | */ |
| 182 | public function getRevisionCount() { |
| 183 | $count = $this->dbw->newSelectQueryBuilder() |
| 184 | ->select( '1' ) |
| 185 | ->from( 'revision' ) |
| 186 | ->where( [ 'rev_page' => $this->source->getId(), $this->getTimeWhere() ] ) |
| 187 | ->limit( self::REVISION_LIMIT + 1 ) |
| 188 | ->caller( __METHOD__ )->fetchRowCount(); |
| 189 | |
| 190 | return $count; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Get the number of revisions that were moved |
| 195 | * Used in the SpecialMergeHistory success message |
| 196 | * @return int |
| 197 | */ |
| 198 | public function getMergedRevisionCount() { |
| 199 | return $this->revisionsMerged; |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * @param callable $authorizer ( string $action, PageIdentity $target, PermissionStatus $status ) |
| 204 | * @param Authority $performer |
| 205 | * @param string $reason |
| 206 | * @return PermissionStatus |
| 207 | */ |
| 208 | private function authorizeInternal( |
| 209 | callable $authorizer, |
| 210 | Authority $performer, |
| 211 | string $reason |
| 212 | ) { |
| 213 | $status = PermissionStatus::newEmpty(); |
| 214 | |
| 215 | $authorizer( 'edit', $this->source, $status ); |
| 216 | $authorizer( 'edit', $this->dest, $status ); |
| 217 | |
| 218 | // Anti-spam |
| 219 | if ( $this->spamChecker->checkSummary( $reason ) !== false ) { |
| 220 | // This is kind of lame, won't display nice |
| 221 | $status->fatal( 'spamprotectiontext' ); |
| 222 | } |
| 223 | |
| 224 | // Check mergehistory permission |
| 225 | if ( !$performer->isAllowed( 'mergehistory' ) ) { |
| 226 | // User doesn't have the right to merge histories |
| 227 | $status->fatal( 'mergehistory-fail-permission' ); |
| 228 | } |
| 229 | return $status; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Check whether $performer can execute the merge. |
| 234 | * |
| 235 | * @note this method does not guarantee full permissions check, so it should |
| 236 | * only be used to to decide whether to show a merge form. To authorize the merge |
| 237 | * action use {@link self::authorizeMerge} instead. |
| 238 | * |
| 239 | * @param Authority $performer |
| 240 | * @param string|null $reason |
| 241 | * @return PermissionStatus |
| 242 | */ |
| 243 | public function probablyCanMerge( Authority $performer, string $reason = null ): PermissionStatus { |
| 244 | return $this->authorizeInternal( |
| 245 | static function ( string $action, PageIdentity $target, PermissionStatus $status ) use ( $performer ) { |
| 246 | return $performer->probablyCan( $action, $target, $status ); |
| 247 | }, |
| 248 | $performer, |
| 249 | $reason |
| 250 | ); |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Authorize the merge by $performer. |
| 255 | * |
| 256 | * @note this method should be used right before the actual merge is performed. |
| 257 | * To check whether a current performer has the potential to merge the history, |
| 258 | * use {@link self::probablyCanMerge} instead. |
| 259 | * |
| 260 | * @param Authority $performer |
| 261 | * @param string|null $reason |
| 262 | * @return PermissionStatus |
| 263 | */ |
| 264 | public function authorizeMerge( Authority $performer, string $reason = null ): PermissionStatus { |
| 265 | return $this->authorizeInternal( |
| 266 | static function ( string $action, PageIdentity $target, PermissionStatus $status ) use ( $performer ) { |
| 267 | return $performer->authorizeWrite( $action, $target, $status ); |
| 268 | }, |
| 269 | $performer, |
| 270 | $reason |
| 271 | ); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * Does various checks that the merge is |
| 276 | * valid. Only things based on the two pages |
| 277 | * should be checked here. |
| 278 | * |
| 279 | * @return Status |
| 280 | */ |
| 281 | public function isValidMerge() { |
| 282 | $status = new Status(); |
| 283 | |
| 284 | // If either article ID is 0, then revisions cannot be reliably selected |
| 285 | if ( $this->source->getId() === 0 ) { |
| 286 | $status->fatal( 'mergehistory-fail-invalid-source' ); |
| 287 | } |
| 288 | if ( $this->dest->getId() === 0 ) { |
| 289 | $status->fatal( 'mergehistory-fail-invalid-dest' ); |
| 290 | } |
| 291 | |
| 292 | // Make sure page aren't the same |
| 293 | if ( $this->source->isSamePageAs( $this->dest ) ) { |
| 294 | $status->fatal( 'mergehistory-fail-self-merge' ); |
| 295 | } |
| 296 | |
| 297 | // Make sure the timestamp is valid |
| 298 | if ( !$this->getTimestampLimit() ) { |
| 299 | $status->fatal( 'mergehistory-fail-bad-timestamp' ); |
| 300 | } |
| 301 | |
| 302 | // $this->timestampLimit must be older than $this->maxTimestamp |
| 303 | if ( $this->getTimestampLimit() > $this->getMaxTimestamp() ) { |
| 304 | $status->fatal( 'mergehistory-fail-timestamps-overlap' ); |
| 305 | } |
| 306 | |
| 307 | // Check that there are not too many revisions to move |
| 308 | if ( $this->getTimestampLimit() && $this->getRevisionCount() > self::REVISION_LIMIT ) { |
| 309 | $status->fatal( 'mergehistory-fail-toobig', Message::numParam( self::REVISION_LIMIT ) ); |
| 310 | } |
| 311 | |
| 312 | return $status; |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Actually attempt the history move |
| 317 | * |
| 318 | * @todo if all versions of page A are moved to B and then a user |
| 319 | * tries to do a reverse-merge via the "unmerge" log link, then page |
| 320 | * A will still be a redirect (as it was after the original merge), |
| 321 | * though it will have the old revisions back from before (as expected). |
| 322 | * The user may have to "undo" the redirect manually to finish the "unmerge". |
| 323 | * Maybe this should delete redirects at the source page of merges? |
| 324 | * |
| 325 | * @param Authority $performer |
| 326 | * @param string $reason |
| 327 | * @return Status status of the history merge |
| 328 | */ |
| 329 | public function merge( Authority $performer, $reason = '' ) { |
| 330 | $status = new Status(); |
| 331 | |
| 332 | // Check validity and permissions required for merge |
| 333 | $validCheck = $this->isValidMerge(); // Check this first to check for null pages |
| 334 | if ( !$validCheck->isOK() ) { |
| 335 | return $validCheck; |
| 336 | } |
| 337 | $permCheck = $this->authorizeMerge( $performer, $reason ); |
| 338 | if ( !$permCheck->isOK() ) { |
| 339 | return Status::wrap( $permCheck ); |
| 340 | } |
| 341 | |
| 342 | $this->dbw->startAtomic( __METHOD__ ); |
| 343 | |
| 344 | $this->dbw->newUpdateQueryBuilder() |
| 345 | ->update( 'revision' ) |
| 346 | ->set( [ 'rev_page' => $this->dest->getId() ] ) |
| 347 | ->where( [ 'rev_page' => $this->source->getId(), $this->getTimeWhere() ] ) |
| 348 | ->caller( __METHOD__ )->execute(); |
| 349 | |
| 350 | // Check if this did anything |
| 351 | $this->revisionsMerged = $this->dbw->affectedRows(); |
| 352 | if ( $this->revisionsMerged < 1 ) { |
| 353 | $this->dbw->endAtomic( __METHOD__ ); |
| 354 | return $status->fatal( 'mergehistory-fail-no-change' ); |
| 355 | } |
| 356 | |
| 357 | $haveRevisions = $this->dbw->newSelectQueryBuilder() |
| 358 | ->from( 'revision' ) |
| 359 | ->where( [ 'rev_page' => $this->source->getId() ] ) |
| 360 | ->forUpdate() |
| 361 | ->caller( __METHOD__ ) |
| 362 | ->fetchRowCount(); |
| 363 | |
| 364 | $legacySource = $this->titleFactory->newFromPageIdentity( $this->source ); |
| 365 | $legacyDest = $this->titleFactory->newFromPageIdentity( $this->dest ); |
| 366 | |
| 367 | // Update source page, histories and invalidate caches |
| 368 | if ( !$haveRevisions ) { |
| 369 | if ( $reason ) { |
| 370 | $reason = wfMessage( |
| 371 | 'mergehistory-comment', |
| 372 | $this->titleFormatter->getPrefixedText( $this->source ), |
| 373 | $this->titleFormatter->getPrefixedText( $this->dest ), |
| 374 | $reason |
| 375 | )->inContentLanguage()->text(); |
| 376 | } else { |
| 377 | $reason = wfMessage( |
| 378 | 'mergehistory-autocomment', |
| 379 | $this->titleFormatter->getPrefixedText( $this->source ), |
| 380 | $this->titleFormatter->getPrefixedText( $this->dest ) |
| 381 | )->inContentLanguage()->text(); |
| 382 | } |
| 383 | |
| 384 | $this->updateSourcePage( $status, $performer->getUser(), $reason ); |
| 385 | |
| 386 | } else { |
| 387 | $legacySource->invalidateCache(); |
| 388 | } |
| 389 | $legacyDest->invalidateCache(); |
| 390 | |
| 391 | // Duplicate watchers of the old article to the new article |
| 392 | $this->watchedItemStore->duplicateAllAssociatedEntries( $this->source, $this->dest ); |
| 393 | |
| 394 | // Update our logs |
| 395 | $logEntry = new ManualLogEntry( 'merge', 'merge' ); |
| 396 | $logEntry->setPerformer( $performer->getUser() ); |
| 397 | $logEntry->setComment( $reason ); |
| 398 | $logEntry->setTarget( $this->source ); |
| 399 | $logEntry->setParameters( [ |
| 400 | '4::dest' => $this->titleFormatter->getPrefixedText( $this->dest ), |
| 401 | '5::mergepoint' => $this->getTimestampLimit()->getTimestamp( TS_MW ), |
| 402 | '6::mergerevid' => $this->revidLimit |
| 403 | ] ); |
| 404 | $logId = $logEntry->insert(); |
| 405 | $logEntry->publish( $logId ); |
| 406 | |
| 407 | $this->hookRunner->onArticleMergeComplete( $legacySource, $legacyDest ); |
| 408 | |
| 409 | $this->dbw->endAtomic( __METHOD__ ); |
| 410 | |
| 411 | return $status; |
| 412 | } |
| 413 | |
| 414 | /** |
| 415 | * Do various cleanup work and updates to the source page. This method |
| 416 | * will only be called if no revision is remaining on the page. |
| 417 | * |
| 418 | * At the end, there would be either a redirect page or a deleted page, |
| 419 | * depending on whether the content model of the page supports redirects or not. |
| 420 | * |
| 421 | * @param Status $status |
| 422 | * @param UserIdentity $user |
| 423 | * @param string $reason |
| 424 | * |
| 425 | * @return Status |
| 426 | */ |
| 427 | private function updateSourcePage( $status, $user, $reason ) { |
| 428 | $deleteSource = false; |
| 429 | $legacySourceTitle = $this->titleFactory->newFromPageIdentity( $this->source ); |
| 430 | $legacyDestTitle = $this->titleFactory->newFromPageIdentity( $this->dest ); |
| 431 | $sourceModel = $legacySourceTitle->getContentModel(); |
| 432 | $contentHandler = $this->contentHandlerFactory->getContentHandler( $sourceModel ); |
| 433 | |
| 434 | if ( !$contentHandler->supportsRedirects() ) { |
| 435 | $deleteSource = true; |
| 436 | $newContent = $contentHandler->makeEmptyContent(); |
| 437 | } else { |
| 438 | $msg = wfMessage( 'mergehistory-redirect-text' )->inContentLanguage()->plain(); |
| 439 | $newContent = $contentHandler->makeRedirectContent( $legacyDestTitle, $msg ); |
| 440 | } |
| 441 | |
| 442 | if ( !$newContent instanceof Content ) { |
| 443 | // Handler supports redirect but cannot create new redirect content? |
| 444 | // Not possible to proceed without Content. |
| 445 | |
| 446 | // @todo. Remove this once there's no evidence it's happening or if it's |
| 447 | // determined all violating handlers have been fixed. |
| 448 | // This is mostly kept because previous code was also blindly checking |
| 449 | // existing of the Content for both content models that supports redirects |
| 450 | // and those that that don't, so it's hard to know what it was masking. |
| 451 | $logger = MediaWiki\Logger\LoggerFactory::getInstance( 'ContentHandler' ); |
| 452 | $logger->warning( |
| 453 | 'ContentHandler for {model} says it supports redirects but failed ' |
| 454 | . 'to return Content object from ContentHandler::makeRedirectContent().' |
| 455 | . ' {value} returned instead.', |
| 456 | [ |
| 457 | 'value' => gettype( $newContent ), |
| 458 | 'model' => $sourceModel |
| 459 | ] |
| 460 | ); |
| 461 | |
| 462 | throw new InvalidArgumentException( |
| 463 | "ContentHandler for '$sourceModel' supports redirects" . |
| 464 | ' but cannot create redirect content during History merge.' |
| 465 | ); |
| 466 | } |
| 467 | |
| 468 | // T263340/T93469: Create revision record to also serve as the page revision. |
| 469 | // This revision will be used to create page content. If the source page's |
| 470 | // content model supports redirects, then it will be the redirect content. |
| 471 | // If the content model does not supports redirect, this content will aid |
| 472 | // proper deletion of the page below. |
| 473 | $comment = CommentStoreComment::newUnsavedComment( $reason ); |
| 474 | $revRecord = new MutableRevisionRecord( $this->source ); |
| 475 | $revRecord->setContent( SlotRecord::MAIN, $newContent ) |
| 476 | ->setPageId( $this->source->getId() ) |
| 477 | ->setComment( $comment ) |
| 478 | ->setUser( $user ) |
| 479 | ->setTimestamp( wfTimestampNow() ); |
| 480 | |
| 481 | $insertedRevRecord = $this->revisionStore->insertRevisionOn( $revRecord, $this->dbw ); |
| 482 | |
| 483 | $newPage = $this->wikiPageFactory->newFromTitle( $this->source ); |
| 484 | $newPage->updateRevisionOn( $this->dbw, $insertedRevRecord ); |
| 485 | |
| 486 | if ( !$deleteSource ) { |
| 487 | // TODO: This doesn't belong here, it should be part of PageLinksTable. |
| 488 | // We have created a redirect page so let's |
| 489 | // record the link from the page to the new title. |
| 490 | // It should have no other outgoing links... |
| 491 | $this->dbw->newDeleteQueryBuilder() |
| 492 | ->deleteFrom( 'pagelinks' ) |
| 493 | ->where( [ 'pl_from' => $this->source->getId() ] ) |
| 494 | ->caller( __METHOD__ )->execute(); |
| 495 | $migrationStage = MediaWikiServices::getInstance()->getMainConfig()->get( |
| 496 | MainConfigNames::PageLinksSchemaMigrationStage |
| 497 | ); |
| 498 | $row = [ |
| 499 | 'pl_from' => $this->source->getId(), |
| 500 | 'pl_from_namespace' => $this->source->getNamespace(), |
| 501 | ]; |
| 502 | if ( $migrationStage & SCHEMA_COMPAT_WRITE_OLD ) { |
| 503 | $row['pl_namespace'] = $this->dest->getNamespace(); |
| 504 | $row['pl_title'] = $this->dest->getDBkey(); |
| 505 | } |
| 506 | if ( $migrationStage & SCHEMA_COMPAT_WRITE_NEW ) { |
| 507 | $row['pl_target_id'] = $this->linkTargetLookup->acquireLinkTargetId( |
| 508 | new TitleValue( $this->dest->getNamespace(), $this->dest->getDBkey() ), |
| 509 | $this->dbw |
| 510 | ); |
| 511 | } |
| 512 | $this->dbw->newInsertQueryBuilder() |
| 513 | ->insertInto( 'pagelinks' ) |
| 514 | ->row( $row ) |
| 515 | ->caller( __METHOD__ )->execute(); |
| 516 | |
| 517 | } else { |
| 518 | // T263340/T93469: Delete the source page to prevent errors because its |
| 519 | // revisions are now tied to a different title and its content model |
| 520 | // does not support redirects, so we cannot leave a new revision on it. |
| 521 | // This deletion does not depend on userright but may still fails. If it |
| 522 | // fails, it will be communicated in the status response. |
| 523 | $reason = wfMessage( 'mergehistory-source-deleted-reason' )->inContentLanguage()->plain(); |
| 524 | $deletionStatus = $newPage->doDeleteArticleReal( $reason, $user ); |
| 525 | // Notify callers that the source page has been deleted. |
| 526 | $status->value = 'source-deleted'; |
| 527 | $status->merge( $deletionStatus ); |
| 528 | } |
| 529 | |
| 530 | return $status; |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * Get the maximum timestamp that we can use (oldest timestamp of dest) |
| 535 | * |
| 536 | * @return MWTimestamp |
| 537 | */ |
| 538 | private function getMaxTimestamp(): MWTimestamp { |
| 539 | if ( $this->maxTimestamp === false ) { |
| 540 | $this->initTimestampLimits(); |
| 541 | } |
| 542 | return $this->maxTimestamp; |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | * Get the timestamp upto which history from the source will be merged, |
| 547 | * or null if something went wrong |
| 548 | * |
| 549 | * @return ?MWTimestamp |
| 550 | */ |
| 551 | private function getTimestampLimit(): ?MWTimestamp { |
| 552 | if ( $this->timestampLimit === false ) { |
| 553 | $this->initTimestampLimits(); |
| 554 | } |
| 555 | return $this->timestampLimit; |
| 556 | } |
| 557 | |
| 558 | /** |
| 559 | * Get the SQL WHERE condition that selects source revisions to insert into destination, |
| 560 | * or null if something went wrong |
| 561 | * |
| 562 | * @return ?string |
| 563 | */ |
| 564 | private function getTimeWhere(): ?string { |
| 565 | if ( $this->timeWhere === false ) { |
| 566 | $this->initTimestampLimits(); |
| 567 | } |
| 568 | return $this->timeWhere; |
| 569 | } |
| 570 | |
| 571 | /** |
| 572 | * Lazily initializes timestamp (and possibly revid) limits and conditions. |
| 573 | */ |
| 574 | private function initTimestampLimits() { |
| 575 | // Max timestamp should be min of destination page |
| 576 | $firstDestTimestamp = $this->dbw->newSelectQueryBuilder() |
| 577 | ->select( 'MIN(rev_timestamp)' ) |
| 578 | ->from( 'revision' ) |
| 579 | ->where( [ 'rev_page' => $this->dest->getId() ] ) |
| 580 | ->caller( __METHOD__ )->fetchField(); |
| 581 | $this->maxTimestamp = new MWTimestamp( $firstDestTimestamp ); |
| 582 | $this->revidLimit = null; |
| 583 | // Get the timestamp pivot condition |
| 584 | try { |
| 585 | if ( $this->timestamp ) { |
| 586 | $parts = explode( '|', $this->timestamp ); |
| 587 | if ( count( $parts ) == 2 ) { |
| 588 | $timestamp = $parts[0]; |
| 589 | $this->revidLimit = $parts[1]; |
| 590 | } else { |
| 591 | $timestamp = $this->timestamp; |
| 592 | } |
| 593 | // If we have a requested timestamp, use the |
| 594 | // latest revision up to that point as the insertion point |
| 595 | $mwTimestamp = new MWTimestamp( $timestamp ); |
| 596 | |
| 597 | $lastWorkingTimestamp = $this->dbw->newSelectQueryBuilder() |
| 598 | ->select( 'MAX(rev_timestamp)' ) |
| 599 | ->from( 'revision' ) |
| 600 | ->where( [ |
| 601 | $this->dbw->expr( 'rev_timestamp', '<=', $this->dbw->timestamp( $mwTimestamp ) ), |
| 602 | 'rev_page' => $this->source->getId() |
| 603 | ] ) |
| 604 | ->caller( __METHOD__ )->fetchField(); |
| 605 | $mwLastWorkingTimestamp = new MWTimestamp( $lastWorkingTimestamp ); |
| 606 | |
| 607 | $timeInsert = $mwLastWorkingTimestamp; |
| 608 | $this->timestampLimit = $mwLastWorkingTimestamp; |
| 609 | } else { |
| 610 | // If we don't, merge entire source page history into the |
| 611 | // beginning of destination page history |
| 612 | |
| 613 | // Get the latest timestamp of the source |
| 614 | $row = $this->dbw->newSelectQueryBuilder() |
| 615 | ->select( [ 'rev_timestamp', 'rev_id' ] ) |
| 616 | ->from( 'page' ) |
| 617 | ->join( 'revision', null, 'page_latest = rev_id' ) |
| 618 | ->where( [ 'page_id' => $this->source->getId() ] ) |
| 619 | ->caller( __METHOD__ )->fetchRow(); |
| 620 | $timeInsert = $this->maxTimestamp; |
| 621 | if ( $row ) { |
| 622 | $lasttimestamp = new MWTimestamp( $row->rev_timestamp ); |
| 623 | $this->timestampLimit = $lasttimestamp; |
| 624 | $this->revidLimit = $row->rev_id; |
| 625 | } else { |
| 626 | $this->timestampLimit = null; |
| 627 | } |
| 628 | } |
| 629 | $dbLimit = $this->dbw->timestamp( $timeInsert ); |
| 630 | if ( $this->revidLimit ) { |
| 631 | $this->timeWhere = $this->dbw->buildComparison( '<=', |
| 632 | [ 'rev_timestamp' => $dbLimit, 'rev_id' => $this->revidLimit ] |
| 633 | ); |
| 634 | } else { |
| 635 | $this->timeWhere = $this->dbw->buildComparison( '<=', |
| 636 | [ 'rev_timestamp' => $dbLimit ] |
| 637 | ); |
| 638 | } |
| 639 | } catch ( TimestampException $ex ) { |
| 640 | // The timestamp we got is screwed up and merge cannot continue |
| 641 | // This should be detected by $this->isValidMerge() |
| 642 | $this->timestampLimit = null; |
| 643 | $this->timeWhere = null; |
| 644 | } |
| 645 | } |
| 646 | } |
| 647 | |
| 648 | /** @deprecated class alias since 1.40 */ |
| 649 | class_alias( MergeHistory::class, 'MergeHistory' ); |