Merge "Show redirect fragments on Special:BrokenRedirects"
[lhc/web/wiklou.git] / includes / specials / SpecialUndelete.php
index d5c24c2..740207d 100644 (file)
  * @file
  * @ingroup SpecialPage
  */
-use MediaWiki\MediaWikiServices;
 
-/**
- * Used to show archived pages and eventually restore them.
- *
- * @ingroup SpecialPage
- */
-class PageArchive {
-       /** @var Title */
-       protected $title;
-
-       /** @var Status */
-       protected $fileStatus;
-
-       /** @var Status */
-       protected $revisionStatus;
-
-       /** @var Config */
-       protected $config;
-
-       function __construct( $title, Config $config = null ) {
-               if ( is_null( $title ) ) {
-                       throw new MWException( __METHOD__ . ' given a null title.' );
-               }
-               $this->title = $title;
-               if ( $config === null ) {
-                       wfDebug( __METHOD__ . ' did not have a Config object passed to it' );
-                       $config = MediaWikiServices::getInstance()->getMainConfig();
-               }
-               $this->config = $config;
-       }
-
-       public function doesWrites() {
-               return true;
-       }
-
-       /**
-        * List all deleted pages recorded in the archive table. Returns result
-        * wrapper with (ar_namespace, ar_title, count) fields, ordered by page
-        * namespace/title.
-        *
-        * @return ResultWrapper
-        */
-       public static function listAllPages() {
-               $dbr = wfGetDB( DB_REPLICA );
-
-               return self::listPages( $dbr, '' );
-       }
-
-       /**
-        * List deleted pages recorded in the archive table matching the
-        * given title prefix.
-        * Returns result wrapper with (ar_namespace, ar_title, count) fields.
-        *
-        * @param string $prefix Title prefix
-        * @return ResultWrapper
-        */
-       public static function listPagesByPrefix( $prefix ) {
-               $dbr = wfGetDB( DB_REPLICA );
-
-               $title = Title::newFromText( $prefix );
-               if ( $title ) {
-                       $ns = $title->getNamespace();
-                       $prefix = $title->getDBkey();
-               } else {
-                       // Prolly won't work too good
-                       // @todo handle bare namespace names cleanly?
-                       $ns = 0;
-               }
-
-               $conds = [
-                       'ar_namespace' => $ns,
-                       'ar_title' . $dbr->buildLike( $prefix, $dbr->anyString() ),
-               ];
-
-               return self::listPages( $dbr, $conds );
-       }
-
-       /**
-        * @param IDatabase $dbr
-        * @param string|array $condition
-        * @return bool|ResultWrapper
-        */
-       protected static function listPages( $dbr, $condition ) {
-               return $dbr->select(
-                       [ 'archive' ],
-                       [
-                               'ar_namespace',
-                               'ar_title',
-                               'count' => 'COUNT(*)'
-                       ],
-                       $condition,
-                       __METHOD__,
-                       [
-                               'GROUP BY' => [ 'ar_namespace', 'ar_title' ],
-                               'ORDER BY' => [ 'ar_namespace', 'ar_title' ],
-                               'LIMIT' => 100,
-                       ]
-               );
-       }
-
-       /**
-        * List the revisions of the given page. Returns result wrapper with
-        * (ar_minor_edit, ar_timestamp, ar_user, ar_user_text, ar_comment) fields.
-        *
-        * @return ResultWrapper
-        */
-       function listRevisions() {
-               $dbr = wfGetDB( DB_REPLICA );
-
-               $tables = [ 'archive' ];
-
-               $fields = [
-                       'ar_minor_edit', 'ar_timestamp', 'ar_user', 'ar_user_text',
-                       'ar_comment', 'ar_len', 'ar_deleted', 'ar_rev_id', 'ar_sha1',
-               ];
-
-               if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
-                       $fields[] = 'ar_content_format';
-                       $fields[] = 'ar_content_model';
-               }
-
-               $conds = [ 'ar_namespace' => $this->title->getNamespace(),
-                       'ar_title' => $this->title->getDBkey() ];
-
-               $options = [ 'ORDER BY' => 'ar_timestamp DESC' ];
-
-               $join_conds = [];
-
-               ChangeTags::modifyDisplayQuery(
-                       $tables,
-                       $fields,
-                       $conds,
-                       $join_conds,
-                       $options,
-                       ''
-               );
-
-               return $dbr->select( $tables,
-                       $fields,
-                       $conds,
-                       __METHOD__,
-                       $options,
-                       $join_conds
-               );
-       }
-
-       /**
-        * List the deleted file revisions for this page, if it's a file page.
-        * Returns a result wrapper with various filearchive fields, or null
-        * if not a file page.
-        *
-        * @return ResultWrapper
-        * @todo Does this belong in Image for fuller encapsulation?
-        */
-       function listFiles() {
-               if ( $this->title->getNamespace() != NS_FILE ) {
-                       return null;
-               }
-
-               $dbr = wfGetDB( DB_REPLICA );
-               return $dbr->select(
-                       'filearchive',
-                       ArchivedFile::selectFields(),
-                       [ 'fa_name' => $this->title->getDBkey() ],
-                       __METHOD__,
-                       [ 'ORDER BY' => 'fa_timestamp DESC' ]
-               );
-       }
-
-       /**
-        * Return a Revision object containing data for the deleted revision.
-        * Note that the result *may* or *may not* have a null page ID.
-        *
-        * @param string $timestamp
-        * @return Revision|null
-        */
-       function getRevision( $timestamp ) {
-               $dbr = wfGetDB( DB_REPLICA );
-
-               $fields = [
-                       'ar_rev_id',
-                       'ar_text',
-                       'ar_comment',
-                       'ar_user',
-                       'ar_user_text',
-                       'ar_timestamp',
-                       'ar_minor_edit',
-                       'ar_flags',
-                       'ar_text_id',
-                       'ar_deleted',
-                       'ar_len',
-                       'ar_sha1',
-               ];
-
-               if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
-                       $fields[] = 'ar_content_format';
-                       $fields[] = 'ar_content_model';
-               }
-
-               $row = $dbr->selectRow( 'archive',
-                       $fields,
-                       [ 'ar_namespace' => $this->title->getNamespace(),
-                               'ar_title' => $this->title->getDBkey(),
-                               'ar_timestamp' => $dbr->timestamp( $timestamp ) ],
-                       __METHOD__ );
-
-               if ( $row ) {
-                       return Revision::newFromArchiveRow( $row, [ 'title' => $this->title ] );
-               }
-
-               return null;
-       }
-
-       /**
-        * Return the most-previous revision, either live or deleted, against
-        * the deleted revision given by timestamp.
-        *
-        * May produce unexpected results in case of history merges or other
-        * unusual time issues.
-        *
-        * @param string $timestamp
-        * @return Revision|null Null when there is no previous revision
-        */
-       function getPreviousRevision( $timestamp ) {
-               $dbr = wfGetDB( DB_REPLICA );
-
-               // Check the previous deleted revision...
-               $row = $dbr->selectRow( 'archive',
-                       'ar_timestamp',
-                       [ 'ar_namespace' => $this->title->getNamespace(),
-                               'ar_title' => $this->title->getDBkey(),
-                               'ar_timestamp < ' .
-                                       $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ],
-                       __METHOD__,
-                       [
-                               'ORDER BY' => 'ar_timestamp DESC',
-                               'LIMIT' => 1 ] );
-               $prevDeleted = $row ? wfTimestamp( TS_MW, $row->ar_timestamp ) : false;
-
-               $row = $dbr->selectRow( [ 'page', 'revision' ],
-                       [ 'rev_id', 'rev_timestamp' ],
-                       [
-                               'page_namespace' => $this->title->getNamespace(),
-                               'page_title' => $this->title->getDBkey(),
-                               'page_id = rev_page',
-                               'rev_timestamp < ' .
-                                       $dbr->addQuotes( $dbr->timestamp( $timestamp ) ) ],
-                       __METHOD__,
-                       [
-                               'ORDER BY' => 'rev_timestamp DESC',
-                               'LIMIT' => 1 ] );
-               $prevLive = $row ? wfTimestamp( TS_MW, $row->rev_timestamp ) : false;
-               $prevLiveId = $row ? intval( $row->rev_id ) : null;
-
-               if ( $prevLive && $prevLive > $prevDeleted ) {
-                       // Most prior revision was live
-                       return Revision::newFromId( $prevLiveId );
-               } elseif ( $prevDeleted ) {
-                       // Most prior revision was deleted
-                       return $this->getRevision( $prevDeleted );
-               }
-
-               // No prior revision on this page.
-               return null;
-       }
-
-       /**
-        * Get the text from an archive row containing ar_text, ar_flags and ar_text_id
-        *
-        * @param object $row Database row
-        * @return string
-        */
-       function getTextFromRow( $row ) {
-               if ( is_null( $row->ar_text_id ) ) {
-                       // An old row from MediaWiki 1.4 or previous.
-                       // Text is embedded in this row in classic compression format.
-                       return Revision::getRevisionText( $row, 'ar_' );
-               }
-
-               // New-style: keyed to the text storage backend.
-               $dbr = wfGetDB( DB_REPLICA );
-               $text = $dbr->selectRow( 'text',
-                       [ 'old_text', 'old_flags' ],
-                       [ 'old_id' => $row->ar_text_id ],
-                       __METHOD__ );
-
-               return Revision::getRevisionText( $text );
-       }
-
-       /**
-        * Fetch (and decompress if necessary) the stored text of the most
-        * recently edited deleted revision of the page.
-        *
-        * If there are no archived revisions for the page, returns NULL.
-        *
-        * @return string|null
-        */
-       function getLastRevisionText() {
-               $dbr = wfGetDB( DB_REPLICA );
-               $row = $dbr->selectRow( 'archive',
-                       [ 'ar_text', 'ar_flags', 'ar_text_id' ],
-                       [ 'ar_namespace' => $this->title->getNamespace(),
-                               'ar_title' => $this->title->getDBkey() ],
-                       __METHOD__,
-                       [ 'ORDER BY' => 'ar_timestamp DESC' ] );
-
-               if ( $row ) {
-                       return $this->getTextFromRow( $row );
-               }
-
-               return null;
-       }
-
-       /**
-        * Quick check if any archived revisions are present for the page.
-        *
-        * @return bool
-        */
-       function isDeleted() {
-               $dbr = wfGetDB( DB_REPLICA );
-               $n = $dbr->selectField( 'archive', 'COUNT(ar_title)',
-                       [ 'ar_namespace' => $this->title->getNamespace(),
-                               'ar_title' => $this->title->getDBkey() ],
-                       __METHOD__
-               );
-
-               return ( $n > 0 );
-       }
-
-       /**
-        * Restore the given (or all) text and file revisions for the page.
-        * Once restored, the items will be removed from the archive tables.
-        * The deletion log will be updated with an undeletion notice.
-        *
-        * This also sets Status objects, $this->fileStatus and $this->revisionStatus
-        * (depending what operations are attempted).
-        *
-        * @param array $timestamps Pass an empty array to restore all revisions,
-        *   otherwise list the ones to undelete.
-        * @param string $comment
-        * @param array $fileVersions
-        * @param bool $unsuppress
-        * @param User $user User performing the action, or null to use $wgUser
-        * @param string|string[] $tags Change tags to add to log entry
-        *   ($user should be able to add the specified tags before this is called)
-        * @return array(number of file revisions restored, number of image revisions
-        *   restored, log message) on success, false on failure.
-        */
-       function undelete( $timestamps, $comment = '', $fileVersions = [],
-               $unsuppress = false, User $user = null, $tags = null
-       ) {
-               // If both the set of text revisions and file revisions are empty,
-               // restore everything. Otherwise, just restore the requested items.
-               $restoreAll = empty( $timestamps ) && empty( $fileVersions );
-
-               $restoreText = $restoreAll || !empty( $timestamps );
-               $restoreFiles = $restoreAll || !empty( $fileVersions );
-
-               if ( $restoreFiles && $this->title->getNamespace() == NS_FILE ) {
-                       $img = wfLocalFile( $this->title );
-                       $img->load( File::READ_LATEST );
-                       $this->fileStatus = $img->restore( $fileVersions, $unsuppress );
-                       if ( !$this->fileStatus->isOK() ) {
-                               return false;
-                       }
-                       $filesRestored = $this->fileStatus->successCount;
-               } else {
-                       $filesRestored = 0;
-               }
-
-               if ( $restoreText ) {
-                       $this->revisionStatus = $this->undeleteRevisions( $timestamps, $unsuppress, $comment );
-                       if ( !$this->revisionStatus->isOK() ) {
-                               return false;
-                       }
-
-                       $textRestored = $this->revisionStatus->getValue();
-               } else {
-                       $textRestored = 0;
-               }
-
-               // Touch the log!
-
-               if ( $textRestored && $filesRestored ) {
-                       $reason = wfMessage( 'undeletedrevisions-files' )
-                               ->numParams( $textRestored, $filesRestored )->inContentLanguage()->text();
-               } elseif ( $textRestored ) {
-                       $reason = wfMessage( 'undeletedrevisions' )->numParams( $textRestored )
-                               ->inContentLanguage()->text();
-               } elseif ( $filesRestored ) {
-                       $reason = wfMessage( 'undeletedfiles' )->numParams( $filesRestored )
-                               ->inContentLanguage()->text();
-               } else {
-                       wfDebug( "Undelete: nothing undeleted...\n" );
-
-                       return false;
-               }
-
-               if ( trim( $comment ) != '' ) {
-                       $reason .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
-               }
-
-               if ( $user === null ) {
-                       global $wgUser;
-                       $user = $wgUser;
-               }
-
-               $logEntry = new ManualLogEntry( 'delete', 'restore' );
-               $logEntry->setPerformer( $user );
-               $logEntry->setTarget( $this->title );
-               $logEntry->setComment( $reason );
-               $logEntry->setTags( $tags );
-
-               Hooks::run( 'ArticleUndeleteLogEntry', [ $this, &$logEntry, $user ] );
-
-               $logid = $logEntry->insert();
-               $logEntry->publish( $logid );
-
-               return [ $textRestored, $filesRestored, $reason ];
-       }
-
-       /**
-        * This is the meaty bit -- It restores archived revisions of the given page
-        * to the revision table.
-        *
-        * @param array $timestamps Pass an empty array to restore all revisions,
-        *   otherwise list the ones to undelete.
-        * @param bool $unsuppress Remove all ar_deleted/fa_deleted restrictions of seletected revs
-        * @param string $comment
-        * @throws ReadOnlyError
-        * @return Status Status object containing the number of revisions restored on success
-        */
-       private function undeleteRevisions( $timestamps, $unsuppress = false, $comment = '' ) {
-               if ( wfReadOnly() ) {
-                       throw new ReadOnlyError();
-               }
-
-               $dbw = wfGetDB( DB_MASTER );
-               $dbw->startAtomic( __METHOD__ );
-
-               $restoreAll = empty( $timestamps );
-
-               # Does this page already exist? We'll have to update it...
-               $article = WikiPage::factory( $this->title );
-               # Load latest data for the current page (T33179)
-               $article->loadPageData( 'fromdbmaster' );
-               $oldcountable = $article->isCountable();
-
-               $page = $dbw->selectRow( 'page',
-                       [ 'page_id', 'page_latest' ],
-                       [ 'page_namespace' => $this->title->getNamespace(),
-                               'page_title' => $this->title->getDBkey() ],
-                       __METHOD__,
-                       [ 'FOR UPDATE' ] // lock page
-               );
-
-               if ( $page ) {
-                       $makepage = false;
-                       # Page already exists. Import the history, and if necessary
-                       # we'll update the latest revision field in the record.
-
-                       # Get the time span of this page
-                       $previousTimestamp = $dbw->selectField( 'revision', 'rev_timestamp',
-                               [ 'rev_id' => $page->page_latest ],
-                               __METHOD__ );
-
-                       if ( $previousTimestamp === false ) {
-                               wfDebug( __METHOD__ . ": existing page refers to a page_latest that does not exist\n" );
-
-                               $status = Status::newGood( 0 );
-                               $status->warning( 'undeleterevision-missing' );
-                               $dbw->endAtomic( __METHOD__ );
-
-                               return $status;
-                       }
-               } else {
-                       # Have to create a new article...
-                       $makepage = true;
-                       $previousTimestamp = 0;
-               }
-
-               $oldWhere = [
-                       'ar_namespace' => $this->title->getNamespace(),
-                       'ar_title' => $this->title->getDBkey(),
-               ];
-               if ( !$restoreAll ) {
-                       $oldWhere['ar_timestamp'] = array_map( [ &$dbw, 'timestamp' ], $timestamps );
-               }
-
-               $fields = [
-                       'ar_id',
-                       'ar_rev_id',
-                       'rev_id',
-                       'ar_text',
-                       'ar_comment',
-                       'ar_user',
-                       'ar_user_text',
-                       'ar_timestamp',
-                       'ar_minor_edit',
-                       'ar_flags',
-                       'ar_text_id',
-                       'ar_deleted',
-                       'ar_page_id',
-                       'ar_len',
-                       'ar_sha1'
-               ];
-
-               if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
-                       $fields[] = 'ar_content_format';
-                       $fields[] = 'ar_content_model';
-               }
-
-               /**
-                * Select each archived revision...
-                */
-               $result = $dbw->select(
-                       [ 'archive', 'revision' ],
-                       $fields,
-                       $oldWhere,
-                       __METHOD__,
-                       /* options */
-                       [ 'ORDER BY' => 'ar_timestamp' ],
-                       [ 'revision' => [ 'LEFT JOIN', 'ar_rev_id=rev_id' ] ]
-               );
-
-               $rev_count = $result->numRows();
-               if ( !$rev_count ) {
-                       wfDebug( __METHOD__ . ": no revisions to restore\n" );
-
-                       $status = Status::newGood( 0 );
-                       $status->warning( "undelete-no-results" );
-                       $dbw->endAtomic( __METHOD__ );
-
-                       return $status;
-               }
-
-               // We use ar_id because there can be duplicate ar_rev_id even for the same
-               // page.  In this case, we may be able to restore the first one.
-               $restoreFailedArIds = [];
-
-               // Map rev_id to the ar_id that is allowed to use it.  When checking later,
-               // if it doesn't match, the current ar_id can not be restored.
-
-               // Value can be an ar_id or -1 (-1 means no ar_id can use it, since the
-               // rev_id is taken before we even start the restore).
-               $allowedRevIdToArIdMap = [];
-
-               $latestRestorableRow = null;
-
-               foreach ( $result as $row ) {
-                       if ( $row->ar_rev_id ) {
-                               // rev_id is taken even before we start restoring.
-                               if ( $row->ar_rev_id === $row->rev_id ) {
-                                       $restoreFailedArIds[] = $row->ar_id;
-                                       $allowedRevIdToArIdMap[$row->ar_rev_id] = -1;
-                               } else {
-                                       // rev_id is not taken yet in the DB, but it might be taken
-                                       // by a prior revision in the same restore operation. If
-                                       // not, we need to reserve it.
-                                       if ( isset( $allowedRevIdToArIdMap[$row->ar_rev_id] ) ) {
-                                               $restoreFailedArIds[] = $row->ar_id;
-                                       } else {
-                                               $allowedRevIdToArIdMap[$row->ar_rev_id] = $row->ar_id;
-                                               $latestRestorableRow = $row;
-                                       }
-                               }
-                       } else {
-                               // If ar_rev_id is null, there can't be a collision, and a
-                               // rev_id will be chosen automatically.
-                               $latestRestorableRow = $row;
-                       }
-               }
-
-               $result->seek( 0 ); // move back
-
-               $oldPageId = 0;
-               if ( $latestRestorableRow !== null ) {
-                       $oldPageId = (int)$latestRestorableRow->ar_page_id; // pass this to ArticleUndelete hook
-
-                       // grab the content to check consistency with global state before restoring the page.
-                       $revision = Revision::newFromArchiveRow( $latestRestorableRow,
-                               [
-                                       'title' => $article->getTitle(), // used to derive default content model
-                               ]
-                       );
-                       $user = User::newFromName( $revision->getUserText( Revision::RAW ), false );
-                       $content = $revision->getContent( Revision::RAW );
-
-                       // NOTE: article ID may not be known yet. prepareSave() should not modify the database.
-                       $status = $content->prepareSave( $article, 0, -1, $user );
-                       if ( !$status->isOK() ) {
-                               $dbw->endAtomic( __METHOD__ );
-
-                               return $status;
-                       }
-               }
-
-               $newid = false; // newly created page ID
-               $restored = 0; // number of revisions restored
-               /** @var Revision $revision */
-               $revision = null;
-
-               // If there are no restorable revisions, we can skip most of the steps.
-               if ( $latestRestorableRow === null ) {
-                       $failedRevisionCount = $rev_count;
-               } else {
-                       if ( $makepage ) {
-                               // Check the state of the newest to-be version...
-                               if ( !$unsuppress
-                                       && ( $latestRestorableRow->ar_deleted & Revision::DELETED_TEXT )
-                               ) {
-                                       $dbw->endAtomic( __METHOD__ );
-
-                                       return Status::newFatal( "undeleterevdel" );
-                               }
-                               // Safe to insert now...
-                               $newid = $article->insertOn( $dbw, $latestRestorableRow->ar_page_id );
-                               if ( $newid === false ) {
-                                       // The old ID is reserved; let's pick another
-                                       $newid = $article->insertOn( $dbw );
-                               }
-                               $pageId = $newid;
-                       } else {
-                               // Check if a deleted revision will become the current revision...
-                               if ( $latestRestorableRow->ar_timestamp > $previousTimestamp ) {
-                                       // Check the state of the newest to-be version...
-                                       if ( !$unsuppress
-                                               && ( $latestRestorableRow->ar_deleted & Revision::DELETED_TEXT )
-                                       ) {
-                                               $dbw->endAtomic( __METHOD__ );
-
-                                               return Status::newFatal( "undeleterevdel" );
-                                       }
-                               }
-
-                               $newid = false;
-                               $pageId = $article->getId();
-                       }
-
-                       foreach ( $result as $row ) {
-                               // Check for key dupes due to needed archive integrity.
-                               if ( $row->ar_rev_id && $allowedRevIdToArIdMap[$row->ar_rev_id] !== $row->ar_id ) {
-                                       continue;
-                               }
-                               // Insert one revision at a time...maintaining deletion status
-                               // unless we are specifically removing all restrictions...
-                               $revision = Revision::newFromArchiveRow( $row,
-                                       [
-                                               'page' => $pageId,
-                                               'title' => $this->title,
-                                               'deleted' => $unsuppress ? 0 : $row->ar_deleted
-                                       ] );
-
-                               $revision->insertOn( $dbw );
-                               $restored++;
-
-                               Hooks::run( 'ArticleRevisionUndeleted',
-                                       [ &$this->title, $revision, $row->ar_page_id ] );
-                       }
-
-                       // Now that it's safely stored, take it out of the archive
-                       // Don't delete rows that we failed to restore
-                       $toDeleteConds = $oldWhere;
-                       $failedRevisionCount = count( $restoreFailedArIds );
-                       if ( $failedRevisionCount > 0 ) {
-                               $toDeleteConds[] = 'ar_id NOT IN ( ' . $dbw->makeList( $restoreFailedArIds ) . ' )';
-                       }
-
-                       $dbw->delete( 'archive',
-                               $toDeleteConds,
-                               __METHOD__ );
-               }
-
-               $status = Status::newGood( $restored );
-
-               if ( $failedRevisionCount > 0 ) {
-                       $status->warning(
-                               wfMessage( 'undeleterevision-duplicate-revid', $failedRevisionCount ) );
-               }
-
-               // Was anything restored at all?
-               if ( $restored ) {
-                       $created = (bool)$newid;
-                       // Attach the latest revision to the page...
-                       $wasnew = $article->updateIfNewerOn( $dbw, $revision );
-                       if ( $created || $wasnew ) {
-                               // Update site stats, link tables, etc
-                               $article->doEditUpdates(
-                                       $revision,
-                                       User::newFromName( $revision->getUserText( Revision::RAW ), false ),
-                                       [
-                                               'created' => $created,
-                                               'oldcountable' => $oldcountable,
-                                               'restored' => true
-                                       ]
-                               );
-                       }
-
-                       Hooks::run( 'ArticleUndelete', [ &$this->title, $created, $comment, $oldPageId ] );
-                       if ( $this->title->getNamespace() == NS_FILE ) {
-                               DeferredUpdates::addUpdate( new HTMLCacheUpdate( $this->title, 'imagelinks' ) );
-                       }
-               }
-
-               $dbw->endAtomic( __METHOD__ );
-
-               return $status;
-       }
-
-       /**
-        * @return Status
-        */
-       function getFileStatus() {
-               return $this->fileStatus;
-       }
-
-       /**
-        * @return Status
-        */
-       function getRevisionStatus() {
-               return $this->revisionStatus;
-       }
-}
+use Wikimedia\Rdbms\ResultWrapper;
 
 /**
  * Special page allowing users with the appropriate permissions to view
@@ -767,6 +45,10 @@ class SpecialUndelete extends SpecialPage {
 
        /** @var Title */
        private $mTargetObj;
+       /**
+        * @var string Search prefix
+        */
+       private $mSearchPrefix;
 
        function __construct() {
                parent::__construct( 'Undelete', 'deletedhistory' );
@@ -953,29 +235,70 @@ class SpecialUndelete extends SpecialPage {
        function showSearchForm() {
                $out = $this->getOutput();
                $out->setPageTitle( $this->msg( 'undelete-search-title' ) );
-               $out->addHTML(
-                       Xml::openElement( 'form', [ 'method' => 'get', 'action' => wfScript() ] ) .
-                               Xml::fieldset( $this->msg( 'undelete-search-box' )->text() ) .
+               $fuzzySearch = $this->getRequest()->getVal( 'fuzzy', true );
+
+               $out->enableOOUI();
+
+               $fields[] = new OOUI\ActionFieldLayout(
+                       new OOUI\TextInputWidget( [
+                               'name' => 'prefix',
+                               'inputId' => 'prefix',
+                               'infusable' => true,
+                               'value' => $this->mSearchPrefix,
+                               'autofocus' => true,
+                       ] ),
+                       new OOUI\ButtonInputWidget( [
+                               'label' => $this->msg( 'undelete-search-submit' )->text(),
+                               'flags' => [ 'primary', 'progressive' ],
+                               'inputId' => 'searchUndelete',
+                               'type' => 'submit',
+                       ] ),
+                       [
+                               'label' => new OOUI\HtmlSnippet(
+                                       $this->msg(
+                                               $fuzzySearch ? 'undelete-search-full' : 'undelete-search-prefix'
+                                       )->parse()
+                               ),
+                               'align' => 'left',
+                       ]
+               );
+
+               $fieldset = new OOUI\FieldsetLayout( [
+                       'label' => $this->msg( 'undelete-search-box' )->text(),
+                       'items' => $fields,
+               ] );
+
+               $form = new OOUI\FormLayout( [
+                       'method' => 'get',
+                       'action' => wfScript(),
+               ] );
+
+               $form->appendContent(
+                       $fieldset,
+                       new OOUI\HtmlSnippet(
                                Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
-                               Html::rawElement(
-                                       'label',
-                                       [ 'for' => 'prefix' ],
-                                       $this->msg( 'undelete-search-prefix' )->parse()
-                               ) .
-                               Xml::input(
-                                       'prefix',
-                                       20,
-                                       $this->mSearchPrefix,
-                                       [ 'id' => 'prefix', 'autofocus' => '' ]
-                               ) . ' ' .
-                               Xml::submitButton( $this->msg( 'undelete-search-submit' )->text() ) .
-                               Xml::closeElement( 'fieldset' ) .
-                               Xml::closeElement( 'form' )
+                               Html::hidden( 'fuzzy', $fuzzySearch )
+                       )
+               );
+
+               $out->addHTML(
+                       new OOUI\PanelLayout( [
+                               'expanded' => false,
+                               'padded' => true,
+                               'framed' => true,
+                               'content' => $form,
+                       ] )
                );
 
                # List undeletable articles
                if ( $this->mSearchPrefix ) {
-                       $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
+                       // For now, we enable search engine match only when specifically asked to
+                       // by using fuzzy=1 parameter.
+                       if ( $fuzzySearch ) {
+                               $result = PageArchive::listPagesBySearch( $this->mSearchPrefix );
+                       } else {
+                               $result = PageArchive::listPagesByPrefix( $this->mSearchPrefix );
+                       }
                        $this->showList( $result );
                }
        }
@@ -999,7 +322,7 @@ class SpecialUndelete extends SpecialPage {
 
                $linkRenderer = $this->getLinkRenderer();
                $undelete = $this->getPageTitle();
-               $out->addHTML( "<ul>\n" );
+               $out->addHTML( "<ul id='undeleteResultsList'>\n" );
                foreach ( $result as $row ) {
                        $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
                        if ( $title !== null ) {
@@ -1022,7 +345,7 @@ class SpecialUndelete extends SpecialPage {
                                );
                        }
                        $revs = $this->msg( 'undeleterevisions' )->numParams( $row->count )->parse();
-                       $out->addHTML( "<li>{$item} ({$revs})</li>\n" );
+                       $out->addHTML( "<li class='undeleteResult'>{$item} ({$revs})</li>\n" );
                }
                $result->free();
                $out->addHTML( "</ul>\n" );
@@ -1346,13 +669,7 @@ class SpecialUndelete extends SpecialPage {
 
                $archive = new PageArchive( $this->mTargetObj, $this->getConfig() );
                Hooks::run( 'UndeleteForm::showHistory', [ &$archive, $this->mTargetObj ] );
-               /*
-               $text = $archive->getLastRevisionText();
-               if( is_null( $text ) ) {
-                       $out->addWikiMsg( 'nohistory' );
-                       return;
-               }
-               */
+
                $out->addHTML( '<div class="mw-undelete-history">' );
                if ( $this->mAllowed ) {
                        $out->addWikiMsg( 'undeletehistory' );
@@ -1390,13 +707,15 @@ class SpecialUndelete extends SpecialPage {
                }
 
                if ( $this->mAllowed ) {
+                       $out->enableOOUI();
+
                        $action = $this->getPageTitle()->getLocalURL( [ 'action' => 'submit' ] );
                        # Start the form here
-                       $top = Xml::openElement(
-                               'form',
-                               [ 'method' => 'post', 'action' => $action, 'id' => 'undelete' ]
-                       );
-                       $out->addHTML( $top );
+                       $form = new OOUI\FormLayout( [
+                               'method' => 'post',
+                               'action' => $action,
+                               'id' => 'undelete',
+                       ] );
                }
 
                # Show relevant lines from the deletion log:
@@ -1411,68 +730,89 @@ class SpecialUndelete extends SpecialPage {
                }
 
                if ( $this->mAllowed && ( $haveRevisions || $haveFiles ) ) {
-                       # Format the user-visible controls (comment field, submission button)
-                       # in a nice little table
+                       $fields[] = new OOUI\Layout( [
+                               'content' => new OOUI\HtmlSnippet( $this->msg( 'undeleteextrahelp' )->parseAsBlock() )
+                       ] );
+
+                       $fields[] = new OOUI\FieldLayout(
+                               new OOUI\TextInputWidget( [
+                                       'name' => 'wpComment',
+                                       'inputId' => 'wpComment',
+                                       'infusable' => true,
+                                       'value' => $this->mComment,
+                                       'autofocus' => true,
+                               ] ),
+                               [
+                                       'label' => $this->msg( 'undeletecomment' )->text(),
+                                       'align' => 'top',
+                               ]
+                       );
+
+                       $fields[] = new OOUI\FieldLayout(
+                               new OOUI\Widget( [
+                                       'content' => new OOUI\HorizontalLayout( [
+                                               'items' => [
+                                                       new OOUI\ButtonInputWidget( [
+                                                               'name' => 'restore',
+                                                               'inputId' => 'mw-undelete-submit',
+                                                               'value' => '1',
+                                                               'label' => $this->msg( 'undeletebtn' )->text(),
+                                                               'flags' => [ 'primary', 'progressive' ],
+                                                               'type' => 'submit',
+                                                       ] ),
+                                                       new OOUI\ButtonInputWidget( [
+                                                               'name' => 'invert',
+                                                               'inputId' => 'mw-undelete-invert',
+                                                               'value' => '1',
+                                                               'label' => $this->msg( 'undeleteinvert' )->text()
+                                                       ] ),
+                                               ]
+                                       ] )
+                               ] )
+                       );
+
                        if ( $this->getUser()->isAllowed( 'suppressrevision' ) ) {
-                               $unsuppressBox =
-                                       "<tr>
-                                               <td>&#160;</td>
-                                               <td class='mw-input'>" .
-                                               Xml::checkLabel( $this->msg( 'revdelete-unsuppress' )->text(),
-                                                       'wpUnsuppress', 'mw-undelete-unsuppress', $this->mUnsuppress ) .
-                                               "</td>
-                                       </tr>";
-                       } else {
-                               $unsuppressBox = '';
+                               $fields[] = new OOUI\FieldLayout(
+                                       new OOUI\CheckboxInputWidget( [
+                                               'name' => 'wpUnsuppress',
+                                               'inputId' => 'mw-undelete-unsuppress',
+                                               'value' => '1',
+                                       ] ),
+                                       [
+                                               'label' => $this->msg( 'revdelete-unsuppress' )->text(),
+                                               'align' => 'inline',
+                                       ]
+                               );
                        }
 
-                       $table = Xml::fieldset( $this->msg( 'undelete-fieldset-title' )->text() ) .
-                               Xml::openElement( 'table', [ 'id' => 'mw-undelete-table' ] ) .
-                               "<tr>
-                                       <td colspan='2' class='mw-undelete-extrahelp'>" .
-                               $this->msg( 'undeleteextrahelp' )->parseAsBlock() .
-                               "</td>
-                       </tr>
-                       <tr>
-                               <td class='mw-label'>" .
-                               Xml::label( $this->msg( 'undeletecomment' )->text(), 'wpComment' ) .
-                               "</td>
-                               <td class='mw-input'>" .
-                               Xml::input(
-                                       'wpComment',
-                                       50,
-                                       $this->mComment,
-                                       [ 'id' => 'wpComment', 'autofocus' => '' ]
-                               ) .
-                               "</td>
-                       </tr>
-                       <tr>
-                               <td>&#160;</td>
-                               <td class='mw-submit'>" .
-                               Xml::submitButton(
-                                       $this->msg( 'undeletebtn' )->text(),
-                                       [ 'name' => 'restore', 'id' => 'mw-undelete-submit' ]
-                               ) . ' ' .
-                               Xml::submitButton(
-                                       $this->msg( 'undeleteinvert' )->text(),
-                                       [ 'name' => 'invert', 'id' => 'mw-undelete-invert' ]
-                               ) .
-                               "</td>
-                       </tr>" .
-                               $unsuppressBox .
-                               Xml::closeElement( 'table' ) .
-                               Xml::closeElement( 'fieldset' );
-
-                       $out->addHTML( $table );
+                       $fieldset = new OOUI\FieldsetLayout( [
+                               'label' => $this->msg( 'undelete-fieldset-title' )->text(),
+                               'id' => 'mw-undelete-table',
+                               'items' => $fields,
+                       ] );
+
+                       $form->appendContent(
+                               new OOUI\PanelLayout( [
+                                       'expanded' => false,
+                                       'padded' => true,
+                                       'framed' => true,
+                                       'content' => $fieldset,
+                               ] ),
+                               new OOUI\HtmlSnippet(
+                                       Html::hidden( 'target', $this->mTarget ) .
+                                       Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() )
+                               )
+                       );
                }
 
-               $out->addHTML( Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n" );
+               $history = '';
+               $history .= Xml::element( 'h2', null, $this->msg( 'history' )->text() ) . "\n";
 
                if ( $haveRevisions ) {
                        # Show the page's stored (deleted) history
 
                        if ( $this->getUser()->isAllowed( 'deleterevision' ) ) {
-                               $out->addHTML( Html::element(
+                               $history .= Html::element(
                                        'button',
                                        [
                                                'name' => 'revdel',
@@ -1480,39 +820,43 @@ class SpecialUndelete extends SpecialPage {
                                                'class' => 'deleterevision-log-submit mw-log-deleterevision-button'
                                        ],
                                        $this->msg( 'showhideselectedversions' )->text()
-                               ) . "\n" );
+                               ) . "\n";
                        }
 
-                       $out->addHTML( '<ul>' );
+                       $history .= '<ul class="mw-undelete-revlist">';
                        $remaining = $revisions->numRows();
                        $earliestLiveTime = $this->mTargetObj->getEarliestRevTime();
 
                        foreach ( $revisions as $row ) {
                                $remaining--;
-                               $out->addHTML( $this->formatRevisionRow( $row, $earliestLiveTime, $remaining ) );
+                               $history .= $this->formatRevisionRow( $row, $earliestLiveTime, $remaining );
                        }
                        $revisions->free();
-                       $out->addHTML( '</ul>' );
+                       $history .= '</ul>';
                } else {
                        $out->addWikiMsg( 'nohistory' );
                }
 
                if ( $haveFiles ) {
-                       $out->addHTML( Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n" );
-                       $out->addHTML( '<ul>' );
+                       $history .= Xml::element( 'h2', null, $this->msg( 'filehist' )->text() ) . "\n";
+                       $history .= '<ul class="mw-undelete-revlist">';
                        foreach ( $files as $row ) {
-                               $out->addHTML( $this->formatFileRow( $row ) );
+                               $history .= $this->formatFileRow( $row );
                        }
                        $files->free();
-                       $out->addHTML( '</ul>' );
+                       $history .= '</ul>';
                }
 
                if ( $this->mAllowed ) {
                        # Slip in the hidden controls here
                        $misc = Html::hidden( 'target', $this->mTarget );
                        $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
-                       $misc .= Xml::closeElement( 'form' );
-                       $out->addHTML( $misc );
+                       $history .= $misc;
+
+                       $form->appendContent( new OOUI\HtmlSnippet( $history ) );
+                       $out->addHTML( $form );
+               } else {
+                       $out->addHTML( $history );
                }
 
                return true;
@@ -1806,9 +1150,11 @@ class SpecialUndelete extends SpecialPage {
                // Show revision undeletion warnings and errors
                $status = $archive->getRevisionStatus();
                if ( $status && !$status->isGood() ) {
-                       $out->wrapWikiMsg(
-                               "<div class=\"error\" id=\"mw-error-cannotundelete\">\n$1\n</div>",
-                               'cannotundelete'
+                       $out->addWikiText( '<div class="error" id="mw-error-cannotundelete">' .
+                               $status->getWikiText(
+                                       'cannotundelete',
+                                       'cannotundelete'
+                               ) . '</div>'
                        );
                }