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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Storage;
use MediaWiki\ChangeTags\ChangeTags;
use MediaWiki\ChangeTags\ChangeTagsStore;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\Deferred\DeferrableUpdate;
use MediaWiki\Json\FormatJson;
use MediaWiki\MainConfigNames;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Revision\RevisionStore;
use Psr\Log\LoggerInterface;
use Wikimedia\Rdbms\IConnectionProvider;
/**
* Adds the mw-reverted tag to reverted edits after a revert is made.
*
* This class is used by RevertedTagUpdateJob to perform the actual update.
*
* @since 1.36
* @author Ostrzyciel
*/
class RevertedTagUpdate implements DeferrableUpdate {
/**
* @internal
*/
public const CONSTRUCTOR_OPTIONS = [ MainConfigNames::RevertedTagMaxDepth ];
/** @var RevisionStore */
private $revisionStore;
/** @var LoggerInterface */
private $logger;
/** @var IConnectionProvider */
private $dbProvider;
/** @var ServiceOptions */
private $options;
/** @var int */
private $revertId;
/** @var EditResult */
private $editResult;
/** @var RevisionRecord|null */
private $revertRevision;
/** @var RevisionRecord|null */
private $newestRevertedRevision;
/** @var RevisionRecord|null */
private $oldestRevertedRevision;
private ChangeTagsStore $changeTagsStore;
/**
* @param RevisionStore $revisionStore
* @param LoggerInterface $logger
* @param ChangeTagsStore $changeTagsStore
* @param IConnectionProvider $dbProvider
* @param ServiceOptions $serviceOptions
* @param int $revertId ID of the revert
* @param EditResult $editResult EditResult object of this revert
*/
public function __construct(
RevisionStore $revisionStore,
LoggerInterface $logger,
ChangeTagsStore $changeTagsStore,
IConnectionProvider $dbProvider,
ServiceOptions $serviceOptions,
int $revertId,
EditResult $editResult
) {
$serviceOptions->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
$this->revisionStore = $revisionStore;
$this->logger = $logger;
$this->dbProvider = $dbProvider;
$this->options = $serviceOptions;
$this->revertId = $revertId;
$this->editResult = $editResult;
$this->changeTagsStore = $changeTagsStore;
}
/**
* Marks reverted edits with `mw-reverted` tag.
*/
public function doUpdate() {
// Do extensive checks, as the update may be carried out even months after the edit
if ( !$this->shouldExecute() ) {
return;
}
// Skip some of the DB code and just tag it if only one edit was reverted
if ( $this->handleSingleRevertedEdit() ) {
return;
}
$maxDepth = $this->options->get( MainConfigNames::RevertedTagMaxDepth );
$extraParams = $this->getTagExtraParams();
$revertedRevisionIds = $this->revisionStore->getRevisionIdsBetween(
$this->getOldestRevertedRevision()->getPageId(),
$this->getOldestRevertedRevision(),
$this->getNewestRevertedRevision(),
$maxDepth,
RevisionStore::INCLUDE_BOTH
);
if ( count( $revertedRevisionIds ) > $maxDepth ) {
// This revert exceeds the depth limit
$this->logger->info(
'The revert is deeper than $wgRevertedTagMaxDepth. Skipping...',
$extraParams
);
return;
}
$revertedRevision = null;
foreach ( $revertedRevisionIds as $revId ) {
$previousRevision = $revertedRevision;
$revertedRevision = $this->revisionStore->getRevisionById( $revId );
if ( $revertedRevision === null ) {
// Shouldn't happen, but necessary for static analysis
continue;
}
$previousRevision ??= $this->revisionStore->getPreviousRevision( $revertedRevision );
if ( $previousRevision !== null &&
$revertedRevision->hasSameContent( $previousRevision )
) {
// This is a null revision (e.g. a page move or protection record)
// See: T265312
continue;
}
$this->changeTagsStore->addTags(
[ ChangeTags::TAG_REVERTED ],
null,
$revId,
null,
FormatJson::encode( $extraParams )
);
}
}
/**
* Performs checks to determine whether the update should execute.
*/
private function shouldExecute(): bool {
$maxDepth = $this->options->get( MainConfigNames::RevertedTagMaxDepth );
if (
!in_array( ChangeTags::TAG_REVERTED, $this->changeTagsStore->getSoftwareTags() ) ||
$maxDepth <= 0
) {
return false;
}
$extraParams = $this->getTagExtraParams();
if ( !$this->editResult->isRevert() ||
$this->editResult->getOldestRevertedRevisionId() === null ||
$this->editResult->getNewestRevertedRevisionId() === null
) {
$this->logger->error( 'Invalid EditResult specified.', $extraParams );
return false;
}
if ( !$this->getOldestRevertedRevision() || !$this->getNewestRevertedRevision() ) {
$this->logger->error(
'Could not find the newest or oldest reverted revision in the database.',
$extraParams
);
return false;
}
if ( !$this->getRevertRevision() ) {
$this->logger->error(
'Could not find the revert revision in the database.',
$extraParams
);
return false;
}
if ( $this->getNewestRevertedRevision()->getPageId() !==
$this->getOldestRevertedRevision()->getPageId()
||
$this->getOldestRevertedRevision()->getPageId() !==
$this->getRevertRevision()->getPageId()
) {
$this->logger->error(
'The revert and reverted revisions belong to different pages.',
$extraParams
);
return false;
}
if ( $this->getRevertRevision()->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
// The revert's text is marked as deleted, which probably means the update
// shouldn't be executed.
$this->logger->info(
'The revert\'s text had been marked as deleted before the update was ' .
'executed. Skipping...',
$extraParams
);
return false;
}
$changeTagsOnRevert = $this->changeTagsStore->getTags(
$this->dbProvider->getReplicaDatabase(),
null,
$this->revertId
);
if ( in_array( ChangeTags::TAG_REVERTED, $changeTagsOnRevert ) ) {
// This is already marked as reverted, which means the update was delayed
// until the edit is approved. Apparently, the edit was not approved, as
// it was reverted, so the update should not be performed.
$this->logger->info(
'The revert had been reverted before the update was executed. Skipping...',
$extraParams
);
return false;
}
return true;
}
/**
* Handles the case where only one edit was reverted.
* Returns true if the update was handled by this method, false otherwise.
*
* This is a much simpler case requiring less DB queries than when dealing with multiple
* reverted edits.
*/
private function handleSingleRevertedEdit(): bool {
if ( $this->editResult->getOldestRevertedRevisionId() !==
$this->editResult->getNewestRevertedRevisionId()
) {
return false;
}
$revertedRevision = $this->getOldestRevertedRevision();
if ( $revertedRevision === null ||
$revertedRevision->isDeleted( RevisionRecord::DELETED_TEXT )
) {
return true;
}
$previousRevision = $this->revisionStore->getPreviousRevision(
$revertedRevision
);
if ( $previousRevision !== null &&
$revertedRevision->hasSameContent( $previousRevision )
) {
// Ignore the very rare case of a null edit. This should not occur unless
// someone does something weird with the page's history before the update
// is executed.
return true;
}
$this->changeTagsStore->addTags(
[ ChangeTags::TAG_REVERTED ],
null,
$this->editResult->getOldestRevertedRevisionId(),
null,
FormatJson::encode( $this->getTagExtraParams() )
);
return true;
}
/**
* Returns additional data to be saved in ct_params field of table 'change_tag'.
*
* Effectively a superset of what EditResult::jsonSerialize() returns.
*/
private function getTagExtraParams(): array {
return array_merge(
[ 'revertId' => $this->revertId ],
$this->editResult->jsonSerialize()
);
}
/**
* Returns the revision that performed the revert.
*
* @return RevisionRecord|null
*/
private function getRevertRevision(): ?RevisionRecord {
if ( !$this->revertRevision ) {
$this->revertRevision = $this->revisionStore->getRevisionById(
$this->revertId
);
}
return $this->revertRevision;
}
/**
* Returns the newest revision record that was reverted.
*
* @return RevisionRecord|null
*/
private function getNewestRevertedRevision(): ?RevisionRecord {
if ( !$this->newestRevertedRevision ) {
$this->newestRevertedRevision = $this->revisionStore->getRevisionById(
// @phan-suppress-next-line PhanTypeMismatchArgumentNullable newestRevertedRevision is checked
$this->editResult->getNewestRevertedRevisionId()
);
}
return $this->newestRevertedRevision;
}
/**
* Returns the oldest revision record that was reverted.
*
* @return RevisionRecord|null
*/
private function getOldestRevertedRevision(): ?RevisionRecord {
if ( !$this->oldestRevertedRevision ) {
$this->oldestRevertedRevision = $this->revisionStore->getRevisionById(
// @phan-suppress-next-line PhanTypeMismatchArgumentNullable oldestRevertedRevision is checked
$this->editResult->getOldestRevertedRevisionId()
);
}
return $this->oldestRevertedRevision;
}
}