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diff --git a/www/wiki/includes/MovePage.php b/www/wiki/includes/MovePage.php
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+++ b/www/wiki/includes/MovePage.php
@@ -0,0 +1,619 @@
+<?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
+ */
+
+use MediaWiki\MediaWikiServices;
+
+/**
+ * Handles the backend logic of moving a page from one title
+ * to another.
+ *
+ * @since 1.24
+ */
+class MovePage {
+
+	/**
+	 * @var Title
+	 */
+	protected $oldTitle;
+
+	/**
+	 * @var Title
+	 */
+	protected $newTitle;
+
+	public function __construct( Title $oldTitle, Title $newTitle ) {
+		$this->oldTitle = $oldTitle;
+		$this->newTitle = $newTitle;
+	}
+
+	public function checkPermissions( User $user, $reason ) {
+		$status = new Status();
+
+		$errors = wfMergeErrorArrays(
+			$this->oldTitle->getUserPermissionsErrors( 'move', $user ),
+			$this->oldTitle->getUserPermissionsErrors( 'edit', $user ),
+			$this->newTitle->getUserPermissionsErrors( 'move-target', $user ),
+			$this->newTitle->getUserPermissionsErrors( 'edit', $user )
+		);
+
+		// Convert into a Status object
+		if ( $errors ) {
+			foreach ( $errors as $error ) {
+				call_user_func_array( [ $status, 'fatal' ], $error );
+			}
+		}
+
+		if ( EditPage::matchSummarySpamRegex( $reason ) !== false ) {
+			// This is kind of lame, won't display nice
+			$status->fatal( 'spamprotectiontext' );
+		}
+
+		$tp = $this->newTitle->getTitleProtection();
+		if ( $tp !== false && !$user->isAllowed( $tp['permission'] ) ) {
+				$status->fatal( 'cantmove-titleprotected' );
+		}
+
+		Hooks::run( 'MovePageCheckPermissions',
+			[ $this->oldTitle, $this->newTitle, $user, $reason, $status ]
+		);
+
+		return $status;
+	}
+
+	/**
+	 * Does various sanity checks that the move is
+	 * valid. Only things based on the two titles
+	 * should be checked here.
+	 *
+	 * @return Status
+	 */
+	public function isValidMove() {
+		global $wgContentHandlerUseDB;
+		$status = new Status();
+
+		if ( $this->oldTitle->equals( $this->newTitle ) ) {
+			$status->fatal( 'selfmove' );
+		}
+		if ( !$this->oldTitle->isMovable() ) {
+			$status->fatal( 'immobile-source-namespace', $this->oldTitle->getNsText() );
+		}
+		if ( $this->newTitle->isExternal() ) {
+			$status->fatal( 'immobile-target-namespace-iw' );
+		}
+		if ( !$this->newTitle->isMovable() ) {
+			$status->fatal( 'immobile-target-namespace', $this->newTitle->getNsText() );
+		}
+
+		$oldid = $this->oldTitle->getArticleID();
+
+		if ( strlen( $this->newTitle->getDBkey() ) < 1 ) {
+			$status->fatal( 'articleexists' );
+		}
+		if (
+			( $this->oldTitle->getDBkey() == '' ) ||
+			( !$oldid ) ||
+			( $this->newTitle->getDBkey() == '' )
+		) {
+			$status->fatal( 'badarticleerror' );
+		}
+
+		# The move is allowed only if (1) the target doesn't exist, or
+		# (2) the target is a redirect to the source, and has no history
+		# (so we can undo bad moves right after they're done).
+		if ( $this->newTitle->getArticleID() && !$this->isValidMoveTarget() ) {
+			$status->fatal( 'articleexists' );
+		}
+
+		// Content model checks
+		if ( !$wgContentHandlerUseDB &&
+			$this->oldTitle->getContentModel() !== $this->newTitle->getContentModel() ) {
+			// can't move a page if that would change the page's content model
+			$status->fatal(
+				'bad-target-model',
+				ContentHandler::getLocalizedName( $this->oldTitle->getContentModel() ),
+				ContentHandler::getLocalizedName( $this->newTitle->getContentModel() )
+			);
+		} elseif (
+			!ContentHandler::getForTitle( $this->oldTitle )->canBeUsedOn( $this->newTitle )
+		) {
+			$status->fatal(
+				'content-not-allowed-here',
+				ContentHandler::getLocalizedName( $this->oldTitle->getContentModel() ),
+				$this->newTitle->getPrefixedText()
+			);
+		}
+
+		// Image-specific checks
+		if ( $this->oldTitle->inNamespace( NS_FILE ) ) {
+			$status->merge( $this->isValidFileMove() );
+		}
+
+		if ( $this->newTitle->inNamespace( NS_FILE ) && !$this->oldTitle->inNamespace( NS_FILE ) ) {
+			$status->fatal( 'nonfile-cannot-move-to-file' );
+		}
+
+		// Hook for extensions to say a title can't be moved for technical reasons
+		Hooks::run( 'MovePageIsValidMove', [ $this->oldTitle, $this->newTitle, $status ] );
+
+		return $status;
+	}
+
+	/**
+	 * Sanity checks for when a file is being moved
+	 *
+	 * @return Status
+	 */
+	protected function isValidFileMove() {
+		$status = new Status();
+		$file = wfLocalFile( $this->oldTitle );
+		$file->load( File::READ_LATEST );
+		if ( $file->exists() ) {
+			if ( $this->newTitle->getText() != wfStripIllegalFilenameChars( $this->newTitle->getText() ) ) {
+				$status->fatal( 'imageinvalidfilename' );
+			}
+			if ( !File::checkExtensionCompatibility( $file, $this->newTitle->getDBkey() ) ) {
+				$status->fatal( 'imagetypemismatch' );
+			}
+		}
+
+		if ( !$this->newTitle->inNamespace( NS_FILE ) ) {
+			$status->fatal( 'imagenocrossnamespace' );
+		}
+
+		return $status;
+	}
+
+	/**
+	 * Checks if $this can be moved to a given Title
+	 * - Selects for update, so don't call it unless you mean business
+	 *
+	 * @since 1.25
+	 * @return bool
+	 */
+	protected function isValidMoveTarget() {
+		# Is it an existing file?
+		if ( $this->newTitle->inNamespace( NS_FILE ) ) {
+			$file = wfLocalFile( $this->newTitle );
+			$file->load( File::READ_LATEST );
+			if ( $file->exists() ) {
+				wfDebug( __METHOD__ . ": file exists\n" );
+				return false;
+			}
+		}
+		# Is it a redirect with no history?
+		if ( !$this->newTitle->isSingleRevRedirect() ) {
+			wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
+			return false;
+		}
+		# Get the article text
+		$rev = Revision::newFromTitle( $this->newTitle, false, Revision::READ_LATEST );
+		if ( !is_object( $rev ) ) {
+			return false;
+		}
+		$content = $rev->getContent();
+		# Does the redirect point to the source?
+		# Or is it a broken self-redirect, usually caused by namespace collisions?
+		$redirTitle = $content ? $content->getRedirectTarget() : null;
+
+		if ( $redirTitle ) {
+			if ( $redirTitle->getPrefixedDBkey() !== $this->oldTitle->getPrefixedDBkey() &&
+				$redirTitle->getPrefixedDBkey() !== $this->newTitle->getPrefixedDBkey() ) {
+				wfDebug( __METHOD__ . ": redirect points to other page\n" );
+				return false;
+			} else {
+				return true;
+			}
+		} else {
+			# Fail safe (not a redirect after all. strange.)
+			wfDebug( __METHOD__ . ": failsafe: database says " . $this->newTitle->getPrefixedDBkey() .
+				" is a redirect, but it doesn't contain a valid redirect.\n" );
+			return false;
+		}
+	}
+
+	/**
+	 * @param User $user
+	 * @param string $reason
+	 * @param bool $createRedirect
+	 * @param string[] $changeTags Change tags to apply to the entry in the move log. Caller
+	 *  should perform permission checks with ChangeTags::canAddTagsAccompanyingChange
+	 * @return Status
+	 */
+	public function move( User $user, $reason, $createRedirect, array $changeTags = [] ) {
+		global $wgCategoryCollation;
+
+		Hooks::run( 'TitleMove', [ $this->oldTitle, $this->newTitle, $user ] );
+
+		// If it is a file, move it first.
+		// It is done before all other moving stuff is done because it's hard to revert.
+		$dbw = wfGetDB( DB_MASTER );
+		if ( $this->oldTitle->getNamespace() == NS_FILE ) {
+			$file = wfLocalFile( $this->oldTitle );
+			$file->load( File::READ_LATEST );
+			if ( $file->exists() ) {
+				$status = $file->move( $this->newTitle );
+				if ( !$status->isOK() ) {
+					return $status;
+				}
+			}
+			// Clear RepoGroup process cache
+			RepoGroup::singleton()->clearCache( $this->oldTitle );
+			RepoGroup::singleton()->clearCache( $this->newTitle ); # clear false negative cache
+		}
+
+		$dbw->startAtomic( __METHOD__ );
+
+		Hooks::run( 'TitleMoveStarting', [ $this->oldTitle, $this->newTitle, $user ] );
+
+		$pageid = $this->oldTitle->getArticleID( Title::GAID_FOR_UPDATE );
+		$protected = $this->oldTitle->isProtected();
+
+		// Do the actual move; if this fails, it will throw an MWException(!)
+		$nullRevision = $this->moveToInternal( $user, $this->newTitle, $reason, $createRedirect,
+			$changeTags );
+
+		// Refresh the sortkey for this row.  Be careful to avoid resetting
+		// cl_timestamp, which may disturb time-based lists on some sites.
+		// @todo This block should be killed, it's duplicating code
+		// from LinksUpdate::getCategoryInsertions() and friends.
+		$prefixes = $dbw->select(
+			'categorylinks',
+			[ 'cl_sortkey_prefix', 'cl_to' ],
+			[ 'cl_from' => $pageid ],
+			__METHOD__
+		);
+		if ( $this->newTitle->getNamespace() == NS_CATEGORY ) {
+			$type = 'subcat';
+		} elseif ( $this->newTitle->getNamespace() == NS_FILE ) {
+			$type = 'file';
+		} else {
+			$type = 'page';
+		}
+		foreach ( $prefixes as $prefixRow ) {
+			$prefix = $prefixRow->cl_sortkey_prefix;
+			$catTo = $prefixRow->cl_to;
+			$dbw->update( 'categorylinks',
+				[
+					'cl_sortkey' => Collation::singleton()->getSortKey(
+							$this->newTitle->getCategorySortkey( $prefix ) ),
+					'cl_collation' => $wgCategoryCollation,
+					'cl_type' => $type,
+					'cl_timestamp=cl_timestamp' ],
+				[
+					'cl_from' => $pageid,
+					'cl_to' => $catTo ],
+				__METHOD__
+			);
+		}
+
+		$redirid = $this->oldTitle->getArticleID();
+
+		if ( $protected ) {
+			# Protect the redirect title as the title used to be...
+			$res = $dbw->select(
+				'page_restrictions',
+				[ 'pr_type', 'pr_level', 'pr_cascade', 'pr_user', 'pr_expiry' ],
+				[ 'pr_page' => $pageid ],
+				__METHOD__,
+				'FOR UPDATE'
+			);
+			$rowsInsert = [];
+			foreach ( $res as $row ) {
+				$rowsInsert[] = [
+					'pr_page' => $redirid,
+					'pr_type' => $row->pr_type,
+					'pr_level' => $row->pr_level,
+					'pr_cascade' => $row->pr_cascade,
+					'pr_user' => $row->pr_user,
+					'pr_expiry' => $row->pr_expiry
+				];
+			}
+			$dbw->insert( 'page_restrictions', $rowsInsert, __METHOD__, [ 'IGNORE' ] );
+
+			// Build comment for log
+			$comment = wfMessage(
+				'prot_1movedto2',
+				$this->oldTitle->getPrefixedText(),
+				$this->newTitle->getPrefixedText()
+			)->inContentLanguage()->text();
+			if ( $reason ) {
+				$comment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
+			}
+
+			// reread inserted pr_ids for log relation
+			$insertedPrIds = $dbw->select(
+				'page_restrictions',
+				'pr_id',
+				[ 'pr_page' => $redirid ],
+				__METHOD__
+			);
+			$logRelationsValues = [];
+			foreach ( $insertedPrIds as $prid ) {
+				$logRelationsValues[] = $prid->pr_id;
+			}
+
+			// Update the protection log
+			$logEntry = new ManualLogEntry( 'protect', 'move_prot' );
+			$logEntry->setTarget( $this->newTitle );
+			$logEntry->setComment( $comment );
+			$logEntry->setPerformer( $user );
+			$logEntry->setParameters( [
+				'4::oldtitle' => $this->oldTitle->getPrefixedText(),
+			] );
+			$logEntry->setRelations( [ 'pr_id' => $logRelationsValues ] );
+			$logEntry->setTags( $changeTags );
+			$logId = $logEntry->insert();
+			$logEntry->publish( $logId );
+		}
+
+		// Update *_from_namespace fields as needed
+		if ( $this->oldTitle->getNamespace() != $this->newTitle->getNamespace() ) {
+			$dbw->update( 'pagelinks',
+				[ 'pl_from_namespace' => $this->newTitle->getNamespace() ],
+				[ 'pl_from' => $pageid ],
+				__METHOD__
+			);
+			$dbw->update( 'templatelinks',
+				[ 'tl_from_namespace' => $this->newTitle->getNamespace() ],
+				[ 'tl_from' => $pageid ],
+				__METHOD__
+			);
+			$dbw->update( 'imagelinks',
+				[ 'il_from_namespace' => $this->newTitle->getNamespace() ],
+				[ 'il_from' => $pageid ],
+				__METHOD__
+			);
+		}
+
+		# Update watchlists
+		$oldtitle = $this->oldTitle->getDBkey();
+		$newtitle = $this->newTitle->getDBkey();
+		$oldsnamespace = MWNamespace::getSubject( $this->oldTitle->getNamespace() );
+		$newsnamespace = MWNamespace::getSubject( $this->newTitle->getNamespace() );
+		if ( $oldsnamespace != $newsnamespace || $oldtitle != $newtitle ) {
+			$store = MediaWikiServices::getInstance()->getWatchedItemStore();
+			$store->duplicateAllAssociatedEntries( $this->oldTitle, $this->newTitle );
+		}
+
+		Hooks::run(
+			'TitleMoveCompleting',
+			[ $this->oldTitle, $this->newTitle,
+				$user, $pageid, $redirid, $reason, $nullRevision ]
+		);
+
+		$dbw->endAtomic( __METHOD__ );
+
+		$params = [
+			&$this->oldTitle,
+			&$this->newTitle,
+			&$user,
+			$pageid,
+			$redirid,
+			$reason,
+			$nullRevision
+		];
+		// Keep each single hook handler atomic
+		DeferredUpdates::addUpdate(
+			new AtomicSectionUpdate(
+				$dbw,
+				__METHOD__,
+				// Hold onto $user to avoid HHVM bug where it no longer
+				// becomes a reference (T118683)
+				function () use ( $params, &$user ) {
+					Hooks::run( 'TitleMoveComplete', $params );
+				}
+			)
+		);
+
+		return Status::newGood();
+	}
+
+	/**
+	 * Move page to a title which is either a redirect to the
+	 * source page or nonexistent
+	 *
+	 * @todo This was basically directly moved from Title, it should be split into
+	 *   smaller functions
+	 * @param User $user the User doing the move
+	 * @param Title $nt The page to move to, which should be a redirect or non-existent
+	 * @param string $reason The reason for the move
+	 * @param bool $createRedirect Whether to leave a redirect at the old title. Does not check
+	 *   if the user has the suppressredirect right
+	 * @param string[] $changeTags Change tags to apply to the entry in the move log
+	 * @return Revision the revision created by the move
+	 * @throws MWException
+	 */
+	private function moveToInternal( User $user, &$nt, $reason = '', $createRedirect = true,
+		array $changeTags = []
+	) {
+		if ( $nt->exists() ) {
+			$moveOverRedirect = true;
+			$logType = 'move_redir';
+		} else {
+			$moveOverRedirect = false;
+			$logType = 'move';
+		}
+
+		if ( $moveOverRedirect ) {
+			$overwriteMessage = wfMessage(
+					'delete_and_move_reason',
+					$this->oldTitle->getPrefixedText()
+				)->inContentLanguage()->text();
+			$newpage = WikiPage::factory( $nt );
+			$errs = [];
+			$status = $newpage->doDeleteArticleReal(
+				$overwriteMessage,
+				/* $suppress */ false,
+				$nt->getArticleID(),
+				/* $commit */ false,
+				$errs,
+				$user,
+				$changeTags,
+				'delete_redir'
+			);
+
+			if ( !$status->isGood() ) {
+				throw new MWException( 'Failed to delete page-move revision: ' . $status );
+			}
+
+			$nt->resetArticleID( false );
+		}
+
+		if ( $createRedirect ) {
+			if ( $this->oldTitle->getNamespace() == NS_CATEGORY
+				&& !wfMessage( 'category-move-redirect-override' )->inContentLanguage()->isDisabled()
+			) {
+				$redirectContent = new WikitextContent(
+					wfMessage( 'category-move-redirect-override' )
+						->params( $nt->getPrefixedText() )->inContentLanguage()->plain() );
+			} else {
+				$contentHandler = ContentHandler::getForTitle( $this->oldTitle );
+				$redirectContent = $contentHandler->makeRedirectContent( $nt,
+					wfMessage( 'move-redirect-text' )->inContentLanguage()->plain() );
+			}
+
+			// NOTE: If this page's content model does not support redirects, $redirectContent will be null.
+		} else {
+			$redirectContent = null;
+		}
+
+		// Figure out whether the content model is no longer the default
+		$oldDefault = ContentHandler::getDefaultModelFor( $this->oldTitle );
+		$contentModel = $this->oldTitle->getContentModel();
+		$newDefault = ContentHandler::getDefaultModelFor( $nt );
+		$defaultContentModelChanging = ( $oldDefault !== $newDefault
+			&& $oldDefault === $contentModel );
+
+		// T59084: log_page should be the ID of the *moved* page
+		$oldid = $this->oldTitle->getArticleID();
+		$logTitle = clone $this->oldTitle;
+
+		$logEntry = new ManualLogEntry( 'move', $logType );
+		$logEntry->setPerformer( $user );
+		$logEntry->setTarget( $logTitle );
+		$logEntry->setComment( $reason );
+		$logEntry->setParameters( [
+			'4::target' => $nt->getPrefixedText(),
+			'5::noredir' => $redirectContent ? '0' : '1',
+		] );
+
+		$formatter = LogFormatter::newFromEntry( $logEntry );
+		$formatter->setContext( RequestContext::newExtraneousContext( $this->oldTitle ) );
+		$comment = $formatter->getPlainActionText();
+		if ( $reason ) {
+			$comment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
+		}
+
+		$dbw = wfGetDB( DB_MASTER );
+
+		$oldpage = WikiPage::factory( $this->oldTitle );
+		$oldcountable = $oldpage->isCountable();
+
+		$newpage = WikiPage::factory( $nt );
+
+		# Save a null revision in the page's history notifying of the move
+		$nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true, $user );
+		if ( !is_object( $nullRevision ) ) {
+			throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
+		}
+
+		$nullRevId = $nullRevision->insertOn( $dbw );
+		$logEntry->setAssociatedRevId( $nullRevId );
+
+		# Change the name of the target page:
+		$dbw->update( 'page',
+			/* SET */ [
+				'page_namespace' => $nt->getNamespace(),
+				'page_title' => $nt->getDBkey(),
+			],
+			/* WHERE */ [ 'page_id' => $oldid ],
+			__METHOD__
+		);
+
+		if ( !$redirectContent ) {
+			// Clean up the old title *before* reset article id - T47348
+			WikiPage::onArticleDelete( $this->oldTitle );
+		}
+
+		$this->oldTitle->resetArticleID( 0 ); // 0 == non existing
+		$nt->resetArticleID( $oldid );
+		$newpage->loadPageData( WikiPage::READ_LOCKING ); // T48397
+
+		$newpage->updateRevisionOn( $dbw, $nullRevision );
+
+		Hooks::run( 'NewRevisionFromEditComplete',
+			[ $newpage, $nullRevision, $nullRevision->getParentId(), $user ] );
+
+		$newpage->doEditUpdates( $nullRevision, $user,
+			[ 'changed' => false, 'moved' => true, 'oldcountable' => $oldcountable ] );
+
+		// If the default content model changes, we need to populate rev_content_model
+		if ( $defaultContentModelChanging ) {
+			$dbw->update(
+				'revision',
+				[ 'rev_content_model' => $contentModel ],
+				[ 'rev_page' => $nt->getArticleID(), 'rev_content_model IS NULL' ],
+				__METHOD__
+			);
+		}
+
+		WikiPage::onArticleCreate( $nt );
+
+		# Recreate the redirect, this time in the other direction.
+		if ( $redirectContent ) {
+			$redirectArticle = WikiPage::factory( $this->oldTitle );
+			$redirectArticle->loadFromRow( false, WikiPage::READ_LOCKING ); // T48397
+			$newid = $redirectArticle->insertOn( $dbw );
+			if ( $newid ) { // sanity
+				$this->oldTitle->resetArticleID( $newid );
+				$redirectRevision = new Revision( [
+					'title' => $this->oldTitle, // for determining the default content model
+					'page' => $newid,
+					'user_text' => $user->getName(),
+					'user' => $user->getId(),
+					'comment' => $comment,
+					'content' => $redirectContent ] );
+				$redirectRevId = $redirectRevision->insertOn( $dbw );
+				$redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
+
+				Hooks::run( 'NewRevisionFromEditComplete',
+					[ $redirectArticle, $redirectRevision, false, $user ] );
+
+				$redirectArticle->doEditUpdates( $redirectRevision, $user, [ 'created' => true ] );
+
+				// make a copy because of log entry below
+				$redirectTags = $changeTags;
+				if ( in_array( 'mw-new-redirect', ChangeTags::getSoftwareTags() ) ) {
+					$redirectTags[] = 'mw-new-redirect';
+				}
+				ChangeTags::addTags( $redirectTags, null, $redirectRevId, null );
+			}
+		}
+
+		# Log the move
+		$logid = $logEntry->insert();
+
+		$logEntry->setTags( $changeTags );
+		$logEntry->publish( $logid );
+
+		return $nullRevision;
+	}
+}