<?php
/**
 * @license GPL-2.0-or-later
 * @file
 */

namespace MediaWiki\Specials;

use MediaWiki\CommentStore\CommentStore;
use MediaWiki\Exception\ErrorPageError;
use MediaWiki\Exception\PermissionsError;
use MediaWiki\Exception\UserBlockedError;
use MediaWiki\FileRepo\File\File;
use MediaWiki\FileRepo\RepoGroup;
use MediaWiki\Html\Html;
use MediaWiki\HTMLForm\HTMLForm;
use MediaWiki\Logging\LogEventsList;
use MediaWiki\Logging\LogPage;
use MediaWiki\Permissions\PermissionManager;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\SpecialPage\SpecialPage;
use MediaWiki\SpecialPage\UnlistedSpecialPage;
use MediaWiki\Status\Status;
use MediaWiki\Title\Title;
use RevDelList;
use RevisionDeleter;

/**
 * Special page allowing users with the appropriate permissions to view
 * and hide revisions. Log items can also be hidden.
 *
 * @ingroup SpecialPage
 */
class SpecialRevisionDelete extends UnlistedSpecialPage {
	/** @var bool Was the DB modified in this request */
	protected $wasSaved = false;

	/** @var bool True if the submit button was clicked, and the form was posted */
	private $submitClicked;

	/** @var array Target ID list */
	private $ids;

	/** @var string Archive name, for reviewing deleted files */
	private $archiveName;

	/** @var string Edit token for securing image views against XSS */
	private $token;

	/** @var Title Title object for target parameter */
	private $targetObj;

	/** @var string Deletion type, may be revision, archive, oldimage, filearchive, logging. */
	private $typeName;

	/** @var array Array of checkbox specs (message, name, deletion bits) */
	private $checks;

	/** @var array UI Labels about the current type */
	private $typeLabels;

	/** @var RevDelList RevDelList object, storing the list of items to be deleted/undeleted */
	private $revDelList;

	/** @var bool Whether user is allowed to perform the action */
	private $mIsAllowed;

	/** @var string */
	private $otherReason;

	private PermissionManager $permissionManager;
	private RepoGroup $repoGroup;

	/**
	 * UI labels for each type.
	 */
	private const UI_LABELS = [
		'revision' => [
			'check-label' => 'revdelete-hide-text',
			'success' => 'revdelete-success',
			'failure' => 'revdelete-failure',
			'text' => 'revdelete-text-text',
			'selected' => 'revdelete-selected-text',
		],
		'archive' => [
			'check-label' => 'revdelete-hide-text',
			'success' => 'revdelete-success',
			'failure' => 'revdelete-failure',
			'text' => 'revdelete-text-text',
			'selected' => 'revdelete-selected-text',
		],
		'oldimage' => [
			'check-label' => 'revdelete-hide-image',
			'success' => 'revdelete-success',
			'failure' => 'revdelete-failure',
			'text' => 'revdelete-text-file',
			'selected' => 'revdelete-selected-file',
		],
		'filearchive' => [
			'check-label' => 'revdelete-hide-image',
			'success' => 'revdelete-success',
			'failure' => 'revdelete-failure',
			'text' => 'revdelete-text-file',
			'selected' => 'revdelete-selected-file',
		],
		'logging' => [
			'check-label' => 'revdelete-hide-name',
			'success' => 'logdelete-success',
			'failure' => 'logdelete-failure',
			'text' => 'logdelete-text',
			'selected' => 'logdelete-selected',
		],
	];

	public function __construct( PermissionManager $permissionManager, RepoGroup $repoGroup ) {
		parent::__construct( 'Revisiondelete' );

		$this->permissionManager = $permissionManager;
		$this->repoGroup = $repoGroup;
	}

	/** @inheritDoc */
	public function doesWrites() {
		return true;
	}

	/** @inheritDoc */
	public function execute( $par ) {
		$this->useTransactionalTimeLimit();

		$this->checkPermissions();
		$this->checkReadOnly();

		$output = $this->getOutput();
		$user = $this->getUser();

		$this->setHeaders();
		$this->outputHeader();
		$request = $this->getRequest();
		$this->submitClicked = $request->wasPosted() && $request->getBool( 'wpSubmit' );
		# Handle our many different possible input types.
		$ids = $request->getVal( 'ids' );
		if ( $ids !== null ) {
			# Allow CSV, for backwards compatibility, or a single ID for show/hide links
			$this->ids = explode( ',', $ids );
		} else {
			# Array input
			$this->ids = array_keys( $request->getArray( 'ids', [] ) );
		}
		// $this->ids = array_map( 'intval', $this->ids );
		$this->ids = array_unique( array_filter( $this->ids ) );

		$this->typeName = $request->getVal( 'type' ) ?? '';
		$this->targetObj = Title::newFromText( $request->getText( 'target' ) );

		# For reviewing deleted files...
		$this->archiveName = $request->getVal( 'file' );
		$this->token = $request->getVal( 'token' );
		if ( $this->archiveName && $this->targetObj ) {
			$this->tryShowFile( $this->archiveName );

			return;
		}

		$this->typeName = RevisionDeleter::getCanonicalTypeName( $this->typeName );

		# No targets?
		if ( !$this->typeName || count( $this->ids ) == 0 ) {
			throw new ErrorPageError( 'revdelete-nooldid-title', 'revdelete-nooldid-text' );
		}

		$restriction = RevisionDeleter::getRestriction( $this->typeName );

		if ( !$this->getAuthority()->isAllowedAny( $restriction, 'deletedhistory' ) ) {
			throw new PermissionsError( $restriction );
		}

		# Allow the list type to adjust the passed target
		$this->targetObj = RevisionDeleter::suggestTarget(
			$this->typeName,
			$this->targetObj,
			$this->ids
		);

		# We need a target page!
		if ( $this->targetObj === null ||
			( $this->typeName !== 'logging' && !$this->targetObj->canExist() )
		) {
			$output->addWikiMsg( 'undelete-header' );

			return;
		}

		// Check blocks
		$checkReplica = !$this->submitClicked;
		if (
			$this->permissionManager->isBlockedFrom(
				$user,
				$this->targetObj,
				$checkReplica
			)
		) {
			throw new UserBlockedError(
				// @phan-suppress-next-line PhanTypeMismatchArgumentNullable Block is checked and not null
				$user->getBlock(),
				$user,
				$this->getLanguage(),
				$request->getIP()
			);
		}

		$this->typeLabels = self::UI_LABELS[$this->typeName];
		$list = $this->getList();
		$list->reset();
		$this->mIsAllowed = $this->permissionManager->userHasRight( $user, $restriction );
		$canViewSuppressedOnly = $this->permissionManager->userHasRight( $user, 'viewsuppressed' ) &&
			!$this->permissionManager->userHasRight( $user, 'suppressrevision' );
		$pageIsSuppressed = $list->areAnySuppressed();
		$this->mIsAllowed = $this->mIsAllowed && !( $canViewSuppressedOnly && $pageIsSuppressed );

		$this->otherReason = $request->getVal( 'wpReason', '' );
		# Give a link to the logs/hist for this page
		$this->showConvenienceLinks();

		# Initialise checkboxes
		$this->checks = [
			# Messages: revdelete-hide-text, revdelete-hide-image, revdelete-hide-name
			[ $this->typeLabels['check-label'], 'wpHidePrimary',
				RevisionDeleter::getRevdelConstant( $this->typeName )
			],
			[ 'revdelete-hide-comment', 'wpHideComment', RevisionRecord::DELETED_COMMENT ],
			[ 'revdelete-hide-user', 'wpHideUser', RevisionRecord::DELETED_USER ]
		];
		if ( $this->permissionManager->userHasRight( $user, 'suppressrevision' ) ) {
			$this->checks[] = [ 'revdelete-hide-restricted',
				'wpHideRestricted', RevisionRecord::DELETED_RESTRICTED ];
		}

		# Either submit or create our form
		if ( $this->mIsAllowed && $this->submitClicked ) {
			$this->submit();
		} else {
			$this->showForm();
		}

		if ( $this->permissionManager->userHasRight( $user, 'deletedhistory' ) ) {
			# Show relevant lines from the deletion log
			$deleteLogPage = new LogPage( 'delete' );
			$output->addHTML( "<h2>" . $deleteLogPage->getName()->escaped() . "</h2>\n" );
			LogEventsList::showLogExtract(
				$output,
				'delete',
				$this->targetObj,
				'', /* user */
				[ 'lim' => 25, 'conds' => $this->getLogQueryCond(), 'useMaster' => $this->wasSaved ]
			);
		}
		# Show relevant lines from the suppression log
		if ( $this->permissionManager->userHasRight( $user, 'suppressionlog' ) ) {
			$suppressLogPage = new LogPage( 'suppress' );
			$output->addHTML( "<h2>" . $suppressLogPage->getName()->escaped() . "</h2>\n" );
			LogEventsList::showLogExtract(
				$output,
				'suppress',
				$this->targetObj,
				'',
				[ 'lim' => 25, 'conds' => $this->getLogQueryCond(), 'useMaster' => $this->wasSaved ]
			);
		}
	}

	/**
	 * Show some useful links in the subtitle
	 */
	protected function showConvenienceLinks() {
		$linkRenderer = $this->getLinkRenderer();
		# Give a link to the logs/hist for this page
		if ( $this->targetObj ) {
			// Also set header tabs to be for the target.
			$this->getSkin()->setRelevantTitle( $this->targetObj );

			$links = [];
			$links[] = $linkRenderer->makeKnownLink(
				SpecialPage::getTitleFor( 'Log' ),
				$this->msg( 'viewpagelogs' )->text(),
				[],
				[ 'page' => $this->targetObj->getPrefixedText() ]
			);
			if ( !$this->targetObj->isSpecialPage() ) {
				# Give a link to the page history
				$links[] = $linkRenderer->makeKnownLink(
					$this->targetObj,
					$this->msg( 'pagehist' )->text(),
					[],
					[ 'action' => 'history' ]
				);
				# Link to deleted edits
				if ( $this->permissionManager->userHasRight( $this->getUser(), 'undelete' ) ) {
					$undelete = SpecialPage::getTitleFor( 'Undelete' );
					$links[] = $linkRenderer->makeKnownLink(
						$undelete,
						$this->msg( 'deletedhist' )->text(),
						[],
						[ 'target' => $this->targetObj->getPrefixedDBkey() ]
					);
				}
			}
			# Logs themselves don't have histories or archived revisions
			$this->getOutput()->addSubtitle( $this->getLanguage()->pipeList( $links ) );
		}
	}

	/**
	 * Get the condition used for fetching log snippets
	 * @return array
	 */
	protected function getLogQueryCond() {
		$conds = [];
		// Revision delete logs for these item
		$conds['log_type'] = [ 'delete', 'suppress' ];
		$conds['log_action'] = $this->getList()->getLogAction();
		$conds['ls_field'] = RevisionDeleter::getRelationType( $this->typeName );
		// Convert IDs to strings, since ls_value is a text field. This avoids
		// a fatal error in PostgreSQL: "operator does not exist: text = integer".
		$conds['ls_value'] = array_map( 'strval', $this->ids );

		return $conds;
	}

	/**
	 * Show a deleted file version requested by the visitor.
	 * @todo Mostly copied from Special:Undelete. Refactor.
	 * @param string $archiveName
	 */
	protected function tryShowFile( $archiveName ) {
		if ( $this->targetObj->getNamespace() !== NS_FILE ) {
			$this->getOutput()->addWikiMsg( 'revdelete-no-file' );

			return;
		}
		$repo = $this->repoGroup->getLocalRepo();
		$oimage = $repo->newFromArchiveName( $this->targetObj, $archiveName );
		$oimage->load();
		// Check if user is allowed to see this file
		if ( !$oimage->exists() ) {
			$this->getOutput()->addWikiMsg( 'revdelete-no-file' );

			return;
		}
		$user = $this->getUser();
		if ( !$oimage->userCan( File::DELETED_FILE, $user ) ) {
			if ( $oimage->isDeleted( File::DELETED_RESTRICTED ) ) {
				throw new PermissionsError( 'suppressrevision' );
			} else {
				throw new PermissionsError( 'deletedtext' );
			}
		}
		if ( !$user->matchEditToken( $this->token, $archiveName ) ) {
			$lang = $this->getLanguage();
			$this->getOutput()->addWikiMsg( 'revdelete-show-file-confirm',
				$this->targetObj->getText(),
				$lang->userDate( $oimage->getTimestamp(), $user ),
				$lang->userTime( $oimage->getTimestamp(), $user ) );
			$this->getOutput()->addHTML(
				Html::rawElement( 'form', [
					'method' => 'POST',
					'action' => $this->getPageTitle()->getLocalURL( [
							'target' => $this->targetObj->getPrefixedDBkey(),
							'file' => $archiveName,
							'token' => $user->getEditToken( $archiveName ),
						] )
					],
					Html::submitButton( $this->msg( 'revdelete-show-file-submit' )->text() )
				)
			);

			return;
		}
		$this->getOutput()->disable();
		# We mustn't allow the output to be CDN cached, otherwise
		# if an admin previews a deleted image, and it's cached, then
		# a user without appropriate permissions can toddle off and
		# nab the image, and CDN will serve it
		$this->getRequest()->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
		$this->getRequest()->response()->header(
			'Cache-Control: no-cache, no-store, max-age=0, must-revalidate'
		);

		$key = $oimage->getStorageKey();
		$path = $repo->getZonePath( 'deleted' ) . '/' . $repo->getDeletedHashPath( $key ) . $key;
		$repo->streamFileWithStatus( $path );
	}

	/**
	 * Get the list object for this request
	 * @return RevDelList
	 */
	protected function getList() {
		if ( $this->revDelList === null ) {
			$this->revDelList = RevisionDeleter::createList(
				$this->typeName, $this->getContext(), $this->targetObj, $this->ids
			);
		}

		return $this->revDelList;
	}

	/**
	 * Show a list of items that we will operate on, and show a form with checkboxes
	 * which will allow the user to choose new visibility settings.
	 */
	protected function showForm() {
		$userAllowed = true;

		// Messages: revdelete-selected-text, revdelete-selected-file, logdelete-selected
		$out = $this->getOutput();
		$out->wrapWikiMsg( "<strong>$1</strong>", [ $this->typeLabels['selected'],
			$this->getLanguage()->formatNum( count( $this->ids ) ), $this->targetObj->getPrefixedText() ] );

		$this->addHelpLink( 'Help:RevisionDelete' );
		$out->addHTML( "<ul>" );

		$numRevisions = 0;
		// Live revisions...
		$list = $this->getList();
		foreach ( $list as $item ) {
			if ( !$item->canView() ) {
				if ( !$this->submitClicked ) {
					throw new PermissionsError( 'suppressrevision' );
				}
				$userAllowed = false;
			}

			$numRevisions++;
			$out->addHTML( $item->getHTML() );
		}

		if ( !$numRevisions ) {
			throw new ErrorPageError( 'revdelete-nooldid-title', 'revdelete-nooldid-text' );
		}

		$out->addHTML( "</ul>" );
		// Explanation text
		$this->addUsageText();

		// Normal sysops can always see what they did, but can't always change it
		if ( !$userAllowed ) {
			return;
		}

		// Show form if the user can submit
		if ( $this->mIsAllowed ) {
			$suppressAllowed = $this->permissionManager
				->userHasRight( $this->getUser(), 'suppressrevision' );
			$out->addModules( [ 'mediawiki.misc-authed-ooui' ] );
			$out->addModuleStyles( [ 'mediawiki.special',
				'mediawiki.interface.helpers.styles' ] );

			$dropdownReason = $this->msg( 'revdelete-reason-dropdown' )
				->page( $this->targetObj )->inContentLanguage()->text();
			// Add additional specific reasons for suppress
			if ( $suppressAllowed ) {
				$dropdownReason .= "\n" . $this->msg( 'revdelete-reason-dropdown-suppress' )
					->page( $this->targetObj )->inContentLanguage()->text();
			}

			$fields = $this->buildCheckBoxes();

			$fields[] = [
				'type' => 'select',
				'label' => $this->msg( 'revdelete-log' )->text(),
				'cssclass' => 'wpReasonDropDown',
				'id' => 'wpRevDeleteReasonList',
				'name' => 'wpRevDeleteReasonList',
				'options' => Html::listDropdownOptions(
					$dropdownReason,
					[ 'other' => $this->msg( 'revdelete-reasonotherlist' )->text() ]
				),
				'default' => $this->getRequest()->getText( 'wpRevDeleteReasonList', 'other' )
			];

			$fields[] = [
				'type' => 'text',
				'label' => $this->msg( 'revdelete-otherreason' )->text(),
				'name' => 'wpReason',
				'id' => 'wpReason',
				// HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
				// (e.g. emojis) count for two each. This limit is overridden in JS to instead count
				// Unicode codepoints.
				// "- 155" is to leave room for the 'wpRevDeleteReasonList' value.
				'maxlength' => CommentStore::COMMENT_CHARACTER_LIMIT - 155,
			];

			$fields[] = [
				'type' => 'hidden',
				'name' => 'wpEditToken',
				'default' => $this->getUser()->getEditToken()
			];

			$fields[] = [
				'type' => 'hidden',
				'name' => 'target',
				'default' => $this->targetObj->getPrefixedText()
			];

			$fields[] = [
				'type' => 'hidden',
				'name' => 'type',
				'default' => $this->typeName
			];

			$fields[] = [
				'type' => 'hidden',
				'name' => 'ids',
				'default' => implode( ',', $this->ids )
			];

			$htmlForm = HTMLForm::factory( 'ooui', $fields, $this->getContext() );
			$htmlForm
				->setSubmitText( $this->msg( 'revdelete-submit', $numRevisions )->text() )
				->setSubmitName( 'wpSubmit' )
				->setWrapperLegend( $this->msg( 'revdelete-legend' )->text() )
				->setAction( $this->getPageTitle()->getLocalURL( [ 'action' => 'submit' ] ) )
				->loadData();
			// Show link to edit the dropdown reasons
			if ( $this->permissionManager->userHasRight( $this->getUser(), 'editinterface' ) ) {
				$link = '';
				$linkRenderer = $this->getLinkRenderer();
				if ( $suppressAllowed ) {
					$link .= $linkRenderer->makeKnownLink(
						$this->msg( 'revdelete-reason-dropdown-suppress' )->inContentLanguage()->getTitle(),
						$this->msg( 'revdelete-edit-reasonlist-suppress' )->text(),
						[],
						[ 'action' => 'edit' ]
					);
					$link .= $this->msg( 'pipe-separator' )->escaped();
				}
				$link .= $linkRenderer->makeKnownLink(
					$this->msg( 'revdelete-reason-dropdown' )->inContentLanguage()->getTitle(),
					$this->msg( 'revdelete-edit-reasonlist' )->text(),
					[],
					[ 'action' => 'edit' ]
				);
				$htmlForm->setPostHtml( Html::rawElement( 'p', [ 'class' => 'mw-revdel-editreasons' ], $link ) );
			}
			$out->addHTML( $htmlForm->getHTML( false ) );
		}
	}

	/**
	 * Show some introductory text
	 * @todo FIXME: Wikimedia-specific policy text
	 */
	protected function addUsageText() {
		// Messages: revdelete-text-text, revdelete-text-file, logdelete-text
		$this->getOutput()->wrapWikiMsg(
			"<strong>$1</strong>\n$2", $this->typeLabels['text'],
			'revdelete-text-others'
		);

		if ( $this->permissionManager->userHasRight( $this->getUser(), 'suppressrevision' ) ) {
			$this->getOutput()->addWikiMsg( 'revdelete-suppress-text' );
		}

		if ( $this->mIsAllowed ) {
			$this->getOutput()->addWikiMsg( 'revdelete-confirm' );
		}
	}

	/**
	 * @return array $fields
	 */
	protected function buildCheckBoxes() {
		$fields = [];

		$type = 'radio';

		$list = $this->getList();

		// If there is just one item, use checkboxes
		if ( $list->length() == 1 ) {
			$list->reset();

			$type = 'check';
		}

		foreach ( $this->checks as $item ) {
			// Messages: revdelete-hide-text, revdelete-hide-image, revdelete-hide-name,
			// revdelete-hide-comment, revdelete-hide-user, revdelete-hide-restricted
			[ $message, $name, $bitField ] = $item;

			$field = [
				'type' => $type,
				'label-raw' => $this->msg( $message )->escaped(),
				'id' => $name,
				'flatlist' => true,
				'name' => $name,
				'default' => $list->length() == 1 ? $list->current()->getBits() & $bitField : null
			];

			if ( $bitField == RevisionRecord::DELETED_RESTRICTED ) {
				$field['label-raw'] = "<b>" . $field['label-raw'] . "</b>";
				if ( $type === 'radio' ) {
					$field['options-messages'] = [
						'revdelete-radio-same' => -1,
						'revdelete-radio-unset-suppress' => 0,
						'revdelete-radio-set-suppress' => 1
					];
				}
			} elseif ( $type === 'radio' ) {
				$field['options-messages'] = [
					'revdelete-radio-same' => -1,
					'revdelete-radio-unset' => 0,
					'revdelete-radio-set' => 1
				];
			}

			$fields[] = $field;
		}

		return $fields;
	}

	/**
	 * UI entry point for form submission.
	 * @throws PermissionsError
	 * @return bool
	 */
	protected function submit() {
		# Check edit token on submission
		$token = $this->getRequest()->getVal( 'wpEditToken' );
		if ( $this->submitClicked && !$this->getUser()->matchEditToken( $token ) ) {
			$this->getOutput()->addWikiMsg( 'sessionfailure' );

			return false;
		}
		$bitParams = $this->extractBitParams();
		// from dropdown
		$listReason = $this->getRequest()->getText( 'wpRevDeleteReasonList', 'other' );
		$comment = $listReason;
		if ( $comment === 'other' ) {
			$comment = $this->otherReason;
		} elseif ( $this->otherReason !== '' ) {
			// Entry from drop down menu + additional comment
			$comment .= $this->msg( 'colon-separator' )->inContentLanguage()->text()
				. $this->otherReason;
		}
		# Can the user set this field?
		if ( $bitParams[RevisionRecord::DELETED_RESTRICTED] == 1
			&& !$this->permissionManager->userHasRight( $this->getUser(), 'suppressrevision' )
		) {
			throw new PermissionsError( 'suppressrevision' );
		}
		# If the save went through, go to success message...
		$status = $this->save( $bitParams, $comment );
		if ( $status->isGood() ) {
			$this->success();

			return true;
		} else {
			# ...otherwise, bounce back to form...
			$this->failure( $status );
		}

		return false;
	}

	/**
	 * Report that the submit operation succeeded
	 */
	protected function success() {
		// Messages: revdelete-success, logdelete-success
		$out = $this->getOutput();
		$out->setPageTitleMsg( $this->msg( 'actioncomplete' ) );
		$out->addHTML(
			Html::successBox(
				$out->msg( $this->typeLabels['success'] )->parse()
			)
		);
		$this->wasSaved = true;
		$this->revDelList->reloadFromPrimary();
		$this->showForm();
	}

	/**
	 * Report that the submit operation failed
	 * @param Status $status
	 */
	protected function failure( $status ) {
		// Messages: revdelete-failure, logdelete-failure
		$out = $this->getOutput();
		$out->setPageTitleMsg( $this->msg( 'actionfailed' ) );
		$out->addModuleStyles( 'mediawiki.codex.messagebox.styles' );
		$out->addHTML(
			Html::errorBox(
				$out->parseAsContent(
					$status->getWikiText( $this->typeLabels['failure'], false, $this->getLanguage() )
				)
			)
		);
		$this->showForm();
	}

	/**
	 * Put together an array that contains -1, 0, or the *_deleted const for each bit
	 *
	 * @return array
	 */
	protected function extractBitParams() {
		$bitfield = [];
		foreach ( $this->checks as [ /* message */, $name, $field ] ) {
			$val = $this->getRequest()->getInt( $name, 0 /* unchecked */ );
			if ( $val < -1 || $val > 1 ) {
				$val = -1; // -1 for existing value
			}
			$bitfield[$field] = $val;
		}
		if ( !isset( $bitfield[RevisionRecord::DELETED_RESTRICTED] ) ) {
			$bitfield[RevisionRecord::DELETED_RESTRICTED] = 0;
		}

		return $bitfield;
	}

	/**
	 * Do the write operations. Simple wrapper for RevDel*List::setVisibility().
	 * @param array $bitPars ExtractBitParams() bitfield array
	 * @param string $reason
	 * @return Status
	 */
	protected function save( array $bitPars, $reason ) {
		return $this->getList()->setVisibility(
			[ 'value' => $bitPars, 'comment' => $reason ]
		);
	}

	/** @inheritDoc */
	protected function getGroupName() {
		return 'pagetools';
	}
}

/**
 * Retain the old class name for backwards compatibility.
 * @deprecated since 1.41
 */
class_alias( SpecialRevisionDelete::class, 'SpecialRevisionDelete' );
