update to MediaWiki 1.17.0

3 files changed, 1414 insertions, 0 deletions

diff --git a/includes/revisiondelete/RevisionDelete.php b/includes/revisiondelete/RevisionDelete.php
new file mode 100644
index 00000000..00afb053
--- /dev/null
+++ b/includes/revisiondelete/RevisionDelete.php
@@ -0,0 +1,690 @@
+<?php
+/**
+ * List for revision table items
+ */
+class RevDel_RevisionList extends RevDel_List {
+	var $currentRevId;
+	var $type = 'revision';
+	var $idField = 'rev_id';
+	var $dateField = 'rev_timestamp';
+	var $authorIdField = 'rev_user';
+	var $authorNameField = 'rev_user_text';
+
+	public function doQuery( $db ) {
+		$ids = array_map( 'intval', $this->ids );
+		return $db->select( array('revision','page'), '*',
+			array(
+				'rev_page' => $this->title->getArticleID(),
+				'rev_id'   => $ids,
+				'rev_page = page_id'
+			),
+			__METHOD__,
+			array( 'ORDER BY' => 'rev_id DESC' )
+		);
+	}
+
+	public function newItem( $row ) {
+		return new RevDel_RevisionItem( $this, $row );
+	}
+
+	public function getCurrent() {
+		if ( is_null( $this->currentRevId ) ) {
+			$dbw = wfGetDB( DB_MASTER );
+			$this->currentRevId = $dbw->selectField( 
+				'page', 'page_latest', $this->title->pageCond(), __METHOD__ );
+		}
+		return $this->currentRevId;
+	}
+
+	public function getSuppressBit() {
+		return Revision::DELETED_RESTRICTED;
+	}
+
+	public function doPreCommitUpdates() {
+		$this->title->invalidateCache();
+		return Status::newGood();
+	}
+
+	public function doPostCommitUpdates() {
+		$this->title->purgeSquid();
+		// Extensions that require referencing previous revisions may need this
+		wfRunHooks( 'ArticleRevisionVisibilitySet', array( &$this->title ) );
+		return Status::newGood();
+	}
+}
+
+/**
+ * Item class for a revision table row
+ */
+class RevDel_RevisionItem extends RevDel_Item {
+	var $revision;
+
+	public function __construct( $list, $row ) {
+		parent::__construct( $list, $row );
+		$this->revision = new Revision( $row );
+	}
+
+	public function canView() {
+		return $this->revision->userCan( Revision::DELETED_RESTRICTED );
+	}
+	
+	public function canViewContent() {
+		return $this->revision->userCan( Revision::DELETED_TEXT );
+	}
+
+	public function getBits() {
+		return $this->revision->mDeleted;
+	}
+
+	public function setBits( $bits ) {
+		$dbw = wfGetDB( DB_MASTER );
+		// Update revision table
+		$dbw->update( 'revision',
+			array( 'rev_deleted' => $bits ),
+			array( 
+				'rev_id' => $this->revision->getId(), 
+				'rev_page' => $this->revision->getPage(),
+				'rev_deleted' => $this->getBits()
+			),
+			__METHOD__
+		);
+		if ( !$dbw->affectedRows() ) {
+			// Concurrent fail!
+			return false;
+		}
+		// Update recentchanges table
+		$dbw->update( 'recentchanges',
+			array( 
+				'rc_deleted' => $bits,
+				'rc_patrolled' => 1
+			),
+			array(
+				'rc_this_oldid' => $this->revision->getId(), // condition
+				// non-unique timestamp index
+				'rc_timestamp' => $dbw->timestamp( $this->revision->getTimestamp() ),
+			),
+			__METHOD__
+		);
+		return true;
+	}
+
+	public function isDeleted() {
+		return $this->revision->isDeleted( Revision::DELETED_TEXT );
+	}
+
+	public function isHideCurrentOp( $newBits ) {
+		return ( $newBits & Revision::DELETED_TEXT ) 
+			&& $this->list->getCurrent() == $this->getId();
+	}
+
+	/**
+	 * Get the HTML link to the revision text.
+	 * Overridden by RevDel_ArchiveItem.
+	 */
+	protected function getRevisionLink() {
+		global $wgLang;
+		$date = $wgLang->timeanddate( $this->revision->getTimestamp(), true );
+		if ( $this->isDeleted() && !$this->canViewContent() ) {
+			return $date;
+		}
+		return $this->special->skin->link(
+			$this->list->title,
+			$date, 
+			array(),
+			array(
+				'oldid' => $this->revision->getId(),
+				'unhide' => 1
+			)
+		);
+	}
+
+	/**
+	 * Get the HTML link to the diff.
+	 * Overridden by RevDel_ArchiveItem
+	 */
+	protected function getDiffLink() {
+		if ( $this->isDeleted() && !$this->canViewContent() ) {
+			return wfMsgHtml('diff');
+		} else {
+			return 
+				$this->special->skin->link( 
+					$this->list->title, 
+					wfMsgHtml('diff'),
+					array(),
+					array(
+						'diff' => $this->revision->getId(),
+						'oldid' => 'prev',
+						'unhide' => 1
+					),
+					array(
+						'known',
+						'noclasses'
+					)
+				);
+		}
+	}
+
+	public function getHTML() {
+		$difflink = $this->getDiffLink();
+		$revlink = $this->getRevisionLink();
+		$userlink = $this->special->skin->revUserLink( $this->revision );
+		$comment = $this->special->skin->revComment( $this->revision );
+		if ( $this->isDeleted() ) {
+			$revlink = "<span class=\"history-deleted\">$revlink</span>";
+		}
+		return "<li>($difflink) $revlink $userlink $comment</li>";
+	}
+}
+
+/**
+ * List for archive table items, i.e. revisions deleted via action=delete
+ */
+class RevDel_ArchiveList extends RevDel_RevisionList {
+	var $type = 'archive';
+	var $idField = 'ar_timestamp';
+	var $dateField = 'ar_timestamp';
+	var $authorIdField = 'ar_user';
+	var $authorNameField = 'ar_user_text';
+
+	public function doQuery( $db ) {
+		$timestamps = array();
+		foreach ( $this->ids as $id ) {
+			$timestamps[] = $db->timestamp( $id );
+		}
+		return $db->select( 'archive', '*',
+				array(
+					'ar_namespace' => $this->title->getNamespace(),
+					'ar_title'     => $this->title->getDBkey(),
+					'ar_timestamp' => $timestamps
+				),
+				__METHOD__,
+				array( 'ORDER BY' => 'ar_timestamp DESC' )
+			);
+	}
+
+	public function newItem( $row ) {
+		return new RevDel_ArchiveItem( $this, $row );
+	}
+
+	public function doPreCommitUpdates() {
+		return Status::newGood();
+	}
+
+	public function doPostCommitUpdates() {
+		return Status::newGood();
+	}
+}
+
+/**
+ * Item class for a archive table row
+ */
+class RevDel_ArchiveItem extends RevDel_RevisionItem {
+	public function __construct( $list, $row ) {
+		RevDel_Item::__construct( $list, $row );
+		$this->revision = Revision::newFromArchiveRow( $row,
+			array( 'page' => $this->list->title->getArticleId() ) );
+	}
+
+	public function getId() {
+		# Convert DB timestamp to MW timestamp
+		return $this->revision->getTimestamp();
+	}
+	
+	public function setBits( $bits ) {
+		$dbw = wfGetDB( DB_MASTER );
+		$dbw->update( 'archive',
+			array( 'ar_deleted' => $bits ),
+			array( 'ar_namespace' => $this->list->title->getNamespace(),
+				'ar_title'     => $this->list->title->getDBkey(),
+				// use timestamp for index
+				'ar_timestamp' => $this->row->ar_timestamp,
+				'ar_rev_id'    => $this->row->ar_rev_id,
+				'ar_deleted' => $this->getBits()
+			),
+			__METHOD__ );
+		return (bool)$dbw->affectedRows();
+	}
+
+	protected function getRevisionLink() {
+		global $wgLang;
+		$undelete = SpecialPage::getTitleFor( 'Undelete' );
+		$date = $wgLang->timeanddate( $this->revision->getTimestamp(), true );
+		if ( $this->isDeleted() && !$this->canViewContent() ) {
+			return $date;
+		}
+		return $this->special->skin->link( $undelete, $date, array(),
+			array(
+				'target' => $this->list->title->getPrefixedText(),
+				'timestamp' => $this->revision->getTimestamp()
+			) );
+	}
+
+	protected function getDiffLink() {
+		if ( $this->isDeleted() && !$this->canViewContent() ) {
+			return wfMsgHtml( 'diff' );
+		}
+		$undelete = SpecialPage::getTitleFor( 'Undelete' );		
+		return $this->special->skin->link( $undelete, wfMsgHtml('diff'), array(), 
+			array(
+				'target' => $this->list->title->getPrefixedText(),
+				'diff' => 'prev',
+				'timestamp' => $this->revision->getTimestamp()
+			) );
+	}
+}
+
+/**
+ * List for oldimage table items
+ */
+class RevDel_FileList extends RevDel_List {
+	var $type = 'oldimage';
+	var $idField = 'oi_archive_name';
+	var $dateField = 'oi_timestamp';
+	var $authorIdField = 'oi_user';
+	var $authorNameField = 'oi_user_text';
+	var $storeBatch, $deleteBatch, $cleanupBatch;
+
+	public function doQuery( $db ) {
+		$archiveNames = array();
+		foreach( $this->ids as $timestamp ) {
+			$archiveNames[] = $timestamp . '!' . $this->title->getDBkey();
+		}
+		return $db->select( 'oldimage', '*',
+			array(
+				'oi_name'         => $this->title->getDBkey(),
+				'oi_archive_name' => $archiveNames
+			),
+			__METHOD__,
+			array( 'ORDER BY' => 'oi_timestamp DESC' )
+		);
+	}
+
+	public function newItem( $row ) {
+		return new RevDel_FileItem( $this, $row );
+	}
+
+	public function clearFileOps() {
+		$this->deleteBatch = array();
+		$this->storeBatch = array();
+		$this->cleanupBatch = array();
+	}
+
+	public function doPreCommitUpdates() {
+		$status = Status::newGood();
+		$repo = RepoGroup::singleton()->getLocalRepo();
+		if ( $this->storeBatch ) {
+			$status->merge( $repo->storeBatch( $this->storeBatch, FileRepo::OVERWRITE_SAME ) );
+		}
+		if ( !$status->isOK() ) {
+			return $status;
+		}
+		if ( $this->deleteBatch ) {
+			$status->merge( $repo->deleteBatch( $this->deleteBatch ) );
+		}
+		if ( !$status->isOK() ) {
+			// Running cleanupDeletedBatch() after a failed storeBatch() with the DB already
+			// modified (but destined for rollback) causes data loss
+			return $status;
+		}
+		if ( $this->cleanupBatch ) {
+			$status->merge( $repo->cleanupDeletedBatch( $this->cleanupBatch ) );
+		}
+		return $status;
+	}
+
+	public function doPostCommitUpdates() {
+		$file = wfLocalFile( $this->title );
+		$file->purgeCache();
+		$file->purgeDescription();
+		return Status::newGood();
+	}
+
+	public function getSuppressBit() {
+		return File::DELETED_RESTRICTED;
+	}
+}
+
+/**
+ * Item class for an oldimage table row
+ */
+class RevDel_FileItem extends RevDel_Item {
+	var $file;
+
+	public function __construct( $list, $row ) {
+		parent::__construct( $list, $row );
+		$this->file = RepoGroup::singleton()->getLocalRepo()->newFileFromRow( $row );
+	}
+
+	public function getId() {
+		$parts = explode( '!', $this->row->oi_archive_name );
+		return $parts[0];
+	}
+
+	public function canView() {
+		return $this->file->userCan( File::DELETED_RESTRICTED );
+	}
+	
+	public function canViewContent() {
+		return $this->file->userCan( File::DELETED_FILE );
+	}
+
+	public function getBits() {
+		return $this->file->getVisibility();
+	}
+
+	public function setBits( $bits ) {
+		# Queue the file op
+		# FIXME: move to LocalFile.php
+		if ( $this->isDeleted() ) {
+			if ( $bits & File::DELETED_FILE ) {
+				# Still deleted
+			} else {
+				# Newly undeleted
+				$key = $this->file->getStorageKey();
+				$srcRel = $this->file->repo->getDeletedHashPath( $key ) . $key;
+				$this->list->storeBatch[] = array(
+					$this->file->repo->getVirtualUrl( 'deleted' ) . '/' . $srcRel,
+					'public',
+					$this->file->getRel()
+				);
+				$this->list->cleanupBatch[] = $key;
+			}
+		} elseif ( $bits & File::DELETED_FILE ) {
+			# Newly deleted
+			$key = $this->file->getStorageKey();
+			$dstRel = $this->file->repo->getDeletedHashPath( $key ) . $key;
+			$this->list->deleteBatch[] = array( $this->file->getRel(), $dstRel );
+		}
+		
+		# Do the database operations
+		$dbw = wfGetDB( DB_MASTER );
+		$dbw->update( 'oldimage',
+			array( 'oi_deleted' => $bits ),
+			array( 
+				'oi_name' => $this->row->oi_name,
+				'oi_timestamp' => $this->row->oi_timestamp,
+				'oi_deleted' => $this->getBits()
+			),
+			__METHOD__
+		);
+		return (bool)$dbw->affectedRows();
+	}
+
+	public function isDeleted() {
+		return $this->file->isDeleted( File::DELETED_FILE );
+	}
+
+	/**
+	 * Get the link to the file. 
+	 * Overridden by RevDel_ArchivedFileItem.
+	 */
+	protected function getLink() {
+		global $wgLang, $wgUser;
+		$date = $wgLang->timeanddate( $this->file->getTimestamp(), true  );		
+		if ( $this->isDeleted() ) {
+			# Hidden files...
+			if ( !$this->canViewContent() ) {
+				$link = $date;
+			} else {
+				$link = $this->special->skin->link( 
+					$this->special->getTitle(), 
+					$date, array(), 
+					array(
+						'target' => $this->list->title->getPrefixedText(),
+						'file'   => $this->file->getArchiveName(),
+						'token'  => $wgUser->editToken( $this->file->getArchiveName() )
+					)
+				);
+			}
+			return '<span class="history-deleted">' . $link . '</span>';
+		} else {
+			# Regular files...
+			return Xml::element( 'a', array( 'href' => $this->file->getUrl() ), $date );
+		}
+	}
+	/**
+	 * Generate a user tool link cluster if the current user is allowed to view it
+	 * @return string HTML
+	 */
+	protected function getUserTools() {
+		if( $this->file->userCan( Revision::DELETED_USER ) ) {
+			$link = $this->special->skin->userLink( $this->file->user, $this->file->user_text ) .
+				$this->special->skin->userToolLinks( $this->file->user, $this->file->user_text );
+		} else {
+			$link = wfMsgHtml( 'rev-deleted-user' );
+		}
+		if( $this->file->isDeleted( Revision::DELETED_USER ) ) {
+			return '<span class="history-deleted">' . $link . '</span>';
+		}
+		return $link;
+	}
+
+	/**
+	 * Wrap and format the file's comment block, if the current
+	 * user is allowed to view it.
+	 *
+	 * @return string HTML
+	 */
+	protected function getComment() {
+		if( $this->file->userCan( File::DELETED_COMMENT ) ) {
+			$block = $this->special->skin->commentBlock( $this->file->description );
+		} else {
+			$block = ' ' . wfMsgHtml( 'rev-deleted-comment' );
+		}
+		if( $this->file->isDeleted( File::DELETED_COMMENT ) ) {
+			return "<span class=\"history-deleted\">$block</span>";
+		}
+		return $block;
+	}
+
+	public function getHTML() {
+		global $wgLang;
+		$data = 
+			wfMsg(
+				'widthheight', 
+				$wgLang->formatNum( $this->file->getWidth() ),
+				$wgLang->formatNum( $this->file->getHeight() ) 
+			) .
+			' (' . 
+			wfMsgExt( 'nbytes', 'parsemag', $wgLang->formatNum( $this->file->getSize() ) ) . 
+			')';
+
+		return '<li>' . $this->getLink() . ' ' . $this->getUserTools() . ' ' .
+			$data . ' ' . $this->getComment(). '</li>';
+	}
+}
+
+/**
+ * List for filearchive table items
+ */
+class RevDel_ArchivedFileList extends RevDel_FileList {
+	var $type = 'filearchive';
+	var $idField = 'fa_id';
+	var $dateField = 'fa_timestamp';
+	var $authorIdField = 'fa_user';
+	var $authorNameField = 'fa_user_text';
+	
+	public function doQuery( $db ) {
+		$ids = array_map( 'intval', $this->ids );
+		return $db->select( 'filearchive', '*',
+			array(
+				'fa_name' => $this->title->getDBkey(),
+				'fa_id'   => $ids
+			),
+			__METHOD__,
+			array( 'ORDER BY' => 'fa_id DESC' )
+		);
+	}
+
+	public function newItem( $row ) {
+		return new RevDel_ArchivedFileItem( $this, $row );
+	}
+}
+
+/**
+ * Item class for a filearchive table row
+ */
+class RevDel_ArchivedFileItem extends RevDel_FileItem {
+	public function __construct( $list, $row ) {
+		RevDel_Item::__construct( $list, $row );
+		$this->file = ArchivedFile::newFromRow( $row );
+	}
+
+	public function getId() {
+		return $this->row->fa_id;
+	}
+
+	public function setBits( $bits ) {
+		$dbw = wfGetDB( DB_MASTER );
+		$dbw->update( 'filearchive',
+			array( 'fa_deleted' => $bits ),
+			array(
+				'fa_id' => $this->row->fa_id,
+				'fa_deleted' => $this->getBits(),
+			),
+			__METHOD__
+		);
+		return (bool)$dbw->affectedRows();
+	}
+
+	protected function getLink() {
+		global $wgLang, $wgUser;
+		$date = $wgLang->timeanddate( $this->file->getTimestamp(), true  );
+		$undelete = SpecialPage::getTitleFor( 'Undelete' );
+		$key = $this->file->getKey();
+		# Hidden files...
+		if( !$this->canViewContent() ) {
+			$link = $date;
+		} else {
+			$link = $this->special->skin->link( $undelete, $date, array(),
+				array(
+					'target' => $this->list->title->getPrefixedText(),
+					'file' => $key,
+					'token' => $wgUser->editToken( $key )
+				)
+			);
+		}
+		if( $this->isDeleted() ) {
+			$link = '<span class="history-deleted">' . $link . '</span>';
+		}
+		return $link;
+	}
+}
+
+/**
+ * List for logging table items
+ */
+class RevDel_LogList extends RevDel_List {
+	var $type = 'logging';
+	var $idField = 'log_id';
+	var $dateField = 'log_timestamp';
+	var $authorIdField = 'log_user';
+	var $authorNameField = 'log_user_text';
+
+	public function doQuery( $db ) {
+		$ids = array_map( 'intval', $this->ids );
+		return $db->select( 'logging', '*',
+			array( 'log_id' => $ids ),
+			__METHOD__,
+			array( 'ORDER BY' => 'log_id DESC' )
+		);
+	}
+
+	public function newItem( $row ) {
+		return new RevDel_LogItem( $this, $row );
+	}
+
+	public function getSuppressBit() {
+		return Revision::DELETED_RESTRICTED;
+	}
+
+	public function getLogAction() {
+		return 'event';
+	}
+
+	public function getLogParams( $params ) {
+		return array(
+			implode( ',', $params['ids'] ),
+			"ofield={$params['oldBits']}",
+			"nfield={$params['newBits']}"
+		);
+	}
+}
+
+/**
+ * Item class for a logging table row
+ */
+class RevDel_LogItem extends RevDel_Item {
+	public function canView() {
+		return LogEventsList::userCan( $this->row, Revision::DELETED_RESTRICTED );
+	}
+	
+	public function canViewContent() {
+		return true; // none
+	}
+
+	public function getBits() {
+		return $this->row->log_deleted;
+	}
+
+	public function setBits( $bits ) {
+		$dbw = wfGetDB( DB_MASTER );
+		$dbw->update( 'recentchanges',
+			array( 
+				'rc_deleted' => $bits, 
+				'rc_patrolled' => 1 
+			),
+			array(
+				'rc_logid' => $this->row->log_id,
+				'rc_timestamp' => $this->row->log_timestamp // index
+			),
+			__METHOD__
+		);
+		$dbw->update( 'logging',
+			array( 'log_deleted' => $bits ),
+			array(
+				'log_id' => $this->row->log_id,
+				'log_deleted' => $this->getBits()
+			),
+			__METHOD__
+		);
+		return (bool)$dbw->affectedRows();
+	}
+
+	public function getHTML() {
+		global $wgLang;
+
+		$date = htmlspecialchars( $wgLang->timeanddate( $this->row->log_timestamp ) );
+		$paramArray = LogPage::extractParams( $this->row->log_params );
+		$title = Title::makeTitle( $this->row->log_namespace, $this->row->log_title );
+
+		// Log link for this page
+		$loglink = $this->special->skin->link(
+			SpecialPage::getTitleFor( 'Log' ),
+			wfMsgHtml( 'log' ),
+			array(),
+			array( 'page' => $title->getPrefixedText() )
+		);
+		// Action text
+		if( !$this->canView() ) {
+			$action = '<span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
+		} else {
+			$action = LogPage::actionText( $this->row->log_type, $this->row->log_action, $title,
+				$this->special->skin, $paramArray, true, true );
+			if( $this->row->log_deleted & LogPage::DELETED_ACTION )
+				$action = '<span class="history-deleted">' . $action . '</span>';
+		}
+		// User links
+		$userLink = $this->special->skin->userLink( $this->row->log_user,
+			User::WhoIs( $this->row->log_user ) );
+		if( LogEventsList::isDeleted($this->row,LogPage::DELETED_USER) ) {
+			$userLink = '<span class="history-deleted">' . $userLink . '</span>';
+		}
+		// Comment
+		$comment = $wgLang->getDirMark() . $this->special->skin->commentBlock( $this->row->log_comment );
+		if( LogEventsList::isDeleted($this->row,LogPage::DELETED_COMMENT) ) {
+			$comment = '<span class="history-deleted">' . $comment . '</span>';
+		}
+		return "<li>($loglink) $date $userLink $action $comment</li>";
+	}
+}
diff --git a/includes/revisiondelete/RevisionDeleteAbstracts.php b/includes/revisiondelete/RevisionDeleteAbstracts.php
new file mode 100644
index 00000000..073c25ba
--- /dev/null
+++ b/includes/revisiondelete/RevisionDeleteAbstracts.php
@@ -0,0 +1,454 @@
+<?php
+
+/**
+ * Abstract base class for a list of deletable items
+ */
+abstract class RevDel_List {
+	var $special, $title, $ids, $res, $current;
+	var $type = null; // override this
+	var $idField = null; // override this
+	var $dateField = false; // override this
+	var $authorIdField = false; // override this
+	var $authorNameField = false; // override this
+
+	/**
+	 * @param $special The parent SpecialPage
+	 * @param $title The target title
+	 * @param $ids Array of IDs
+	 */
+	public function __construct( $special, $title, $ids ) {
+		$this->special = $special;
+		$this->title = $title;
+		$this->ids = $ids;
+	}
+
+	/**
+	 * Get the internal type name of this list. Equal to the table name.
+	 */
+	public function getType() {
+		return $this->type;
+	}
+
+	/**
+	 * Get the DB field name associated with the ID list
+	 */
+	public function getIdField() {
+		return $this->idField;
+	}
+
+	/**
+	 * Get the DB field name storing timestamps
+	 */
+	public function getTimestampField() {
+		return $this->dateField;
+	}
+
+	/**
+	 * Get the DB field name storing user ids
+	 */
+	public function getAuthorIdField() {
+		return $this->authorIdField;
+	}
+
+	/**
+	 * Get the DB field name storing user names
+	 */
+	public function getAuthorNameField() {
+		return $this->authorNameField;
+	}
+	/**
+	 * Set the visibility for the revisions in this list. Logging and 
+	 * transactions are done here.
+	 *
+	 * @param $params Associative array of parameters. Members are:
+	 *     value:       The integer value to set the visibility to
+	 *     comment:     The log comment.
+	 * @return Status
+	 */
+	public function setVisibility( $params ) {
+		$bitPars = $params['value'];
+		$comment = $params['comment'];
+
+		$this->res = false;
+		$dbw = wfGetDB( DB_MASTER );
+		$this->doQuery( $dbw );
+		$dbw->begin();
+		$status = Status::newGood();
+		$missing = array_flip( $this->ids );
+		$this->clearFileOps();
+		$idsForLog = array();
+		$authorIds = $authorIPs = array();
+
+		for ( $this->reset(); $this->current(); $this->next() ) {
+			$item = $this->current();
+			unset( $missing[ $item->getId() ] );
+
+			$oldBits = $item->getBits();
+			// Build the actual new rev_deleted bitfield
+			$newBits = SpecialRevisionDelete::extractBitfield( $bitPars, $oldBits );
+
+			if ( $oldBits == $newBits ) {
+				$status->warning( 'revdelete-no-change', $item->formatDate(), $item->formatTime() );
+				$status->failCount++;
+				continue;
+			} elseif ( $oldBits == 0 && $newBits != 0 ) {
+				$opType = 'hide';
+			} elseif ( $oldBits != 0 && $newBits == 0 ) {
+				$opType = 'show';
+			} else {
+				$opType = 'modify';
+			}
+
+			if ( $item->isHideCurrentOp( $newBits ) ) {
+				// Cannot hide current version text
+				$status->error( 'revdelete-hide-current', $item->formatDate(), $item->formatTime() );
+				$status->failCount++;
+				continue;
+			}
+			if ( !$item->canView() ) {
+				// Cannot access this revision
+				$msg = ($opType == 'show') ?
+					'revdelete-show-no-access' : 'revdelete-modify-no-access';
+				$status->error( $msg, $item->formatDate(), $item->formatTime() );
+				$status->failCount++;
+				continue;
+			}
+			// Cannot just "hide from Sysops" without hiding any fields
+			if( $newBits == Revision::DELETED_RESTRICTED ) {
+				$status->warning( 'revdelete-only-restricted', $item->formatDate(), $item->formatTime() );
+				$status->failCount++;
+				continue;
+			} 
+
+			// Update the revision
+			$ok = $item->setBits( $newBits );
+
+			if ( $ok ) {
+				$idsForLog[] = $item->getId();
+				$status->successCount++;
+				if( $item->getAuthorId() > 0 ) {
+					$authorIds[] = $item->getAuthorId();
+				} else if( IP::isIPAddress( $item->getAuthorName() ) ) {
+					$authorIPs[] = $item->getAuthorName();
+				}
+			} else {
+				$status->error( 'revdelete-concurrent-change', $item->formatDate(), $item->formatTime() );
+				$status->failCount++;
+			}
+		}
+
+		// Handle missing revisions
+		foreach ( $missing as $id => $unused ) {
+			$status->error( 'revdelete-modify-missing', $id );
+			$status->failCount++;
+		}
+
+		if ( $status->successCount == 0 ) {
+			$status->ok = false;
+			$dbw->rollback();
+			return $status;
+		}
+
+		// Save success count 
+		$successCount = $status->successCount;
+
+		// Move files, if there are any
+		$status->merge( $this->doPreCommitUpdates() );
+		if ( !$status->isOK() ) {
+			// Fatal error, such as no configured archive directory
+			$dbw->rollback();
+			return $status;
+		}
+
+		// Log it
+		$this->updateLog( array(
+			'title' => $this->title, 
+			'count' => $successCount, 
+			'newBits' => $newBits, 
+			'oldBits' => $oldBits,
+			'comment' => $comment,
+			'ids' => $idsForLog,
+			'authorIds' => $authorIds,
+			'authorIPs' => $authorIPs
+		) );
+		$dbw->commit();
+
+		// Clear caches
+		$status->merge( $this->doPostCommitUpdates() );
+		return $status;
+	}
+
+	/**
+	 * Reload the list data from the master DB. This can be done after setVisibility()
+	 * to allow $item->getHTML() to show the new data.
+	 */
+	function reloadFromMaster() {
+		$dbw = wfGetDB( DB_MASTER );
+		$this->res = $this->doQuery( $dbw );
+	}
+
+	/**
+	 * Record a log entry on the action
+	 * @param $params Associative array of parameters:
+	 *     newBits:         The new value of the *_deleted bitfield
+	 *     oldBits:         The old value of the *_deleted bitfield. 
+	 *     title:           The target title
+	 *     ids:             The ID list
+	 *     comment:         The log comment
+	 *     authorsIds:      The array of the user IDs of the offenders
+	 *     authorsIPs:      The array of the IP/anon user offenders
+	 */
+	protected function updateLog( $params ) {
+		// Get the URL param's corresponding DB field
+		$field = RevisionDeleter::getRelationType( $this->getType() );
+		if( !$field ) {
+			throw new MWException( "Bad log URL param type!" );
+		}
+		// Put things hidden from sysops in the oversight log
+		if ( ( $params['newBits'] | $params['oldBits'] ) & $this->getSuppressBit() ) {
+			$logType = 'suppress';
+		} else {
+			$logType = 'delete';
+		}
+		// Add params for effected page and ids
+		$logParams = $this->getLogParams( $params );
+		// Actually add the deletion log entry
+		$log = new LogPage( $logType );
+		$logid = $log->addEntry( $this->getLogAction(), $params['title'],
+			$params['comment'], $logParams );
+		// Allow for easy searching of deletion log items for revision/log items
+		$log->addRelations( $field, $params['ids'], $logid );
+		$log->addRelations( 'target_author_id', $params['authorIds'], $logid );
+		$log->addRelations( 'target_author_ip', $params['authorIPs'], $logid );
+	}
+
+	/**
+	 * Get the log action for this list type
+	 */
+	public function getLogAction() {
+		return 'revision';
+	}
+
+	/**
+	 * Get log parameter array.
+	 * @param $params Associative array of log parameters, same as updateLog()
+	 * @return array
+	 */
+	public function getLogParams( $params ) {
+		return array(
+			$this->getType(),
+			implode( ',', $params['ids'] ),
+			"ofield={$params['oldBits']}",
+			"nfield={$params['newBits']}"
+		);
+	}
+
+	/**
+	 * Initialise the current iteration pointer
+	 */
+	protected function initCurrent() {
+		$row = $this->res->current();
+		if ( $row ) {
+			$this->current = $this->newItem( $row );
+		} else {
+			$this->current = false;
+		}
+	}
+
+	/**
+	 * Start iteration. This must be called before current() or next(). 
+	 * @return First list item
+	 */
+	public function reset() {
+		if ( !$this->res ) {
+			$this->res = $this->doQuery( wfGetDB( DB_SLAVE ) );
+		} else {
+			$this->res->rewind();
+		}
+		$this->initCurrent();
+		return $this->current;
+	}
+
+	/**
+	 * Get the current list item, or false if we are at the end
+	 */
+	public function current() {
+		return $this->current;
+	}
+
+	/**
+	 * Move the iteration pointer to the next list item, and return it.
+	 */
+	public function next() {
+		$this->res->next();
+		$this->initCurrent();
+		return $this->current;
+	}
+	
+	/**
+	 * Get the number of items in the list.
+	 */
+	public function length() {
+		if( !$this->res ) {
+			return 0;
+		} else {
+			return $this->res->numRows();
+		}
+	}
+
+	/**
+	 * Clear any data structures needed for doPreCommitUpdates() and doPostCommitUpdates()
+	 * STUB
+	 */
+	public function clearFileOps() {
+	}
+
+	/** 
+	 * A hook for setVisibility(): do batch updates pre-commit.
+	 * STUB
+	 * @return Status
+	 */
+	public function doPreCommitUpdates() {
+		return Status::newGood();
+	}
+
+	/**
+	 * A hook for setVisibility(): do any necessary updates post-commit. 
+	 * STUB
+	 * @return Status 
+	 */
+	public function doPostCommitUpdates() {
+		return Status::newGood();
+	}
+
+	/**
+	 * Create an item object from a DB result row
+	 * @param $row stdclass
+	 */
+	abstract public function newItem( $row );
+
+	/**
+	 * Do the DB query to iterate through the objects.
+	 * @param $db Database object to use for the query
+	 */
+	abstract public function doQuery( $db );
+
+	/**
+	 * Get the integer value of the flag used for suppression
+	 */
+	abstract public function getSuppressBit();
+}
+
+/**
+ * Abstract base class for deletable items
+ */
+abstract class RevDel_Item {
+	/** The parent SpecialPage */
+	var $special;
+
+	/** The parent RevDel_List */
+	var $list;
+
+	/** The DB result row */
+	var $row;
+
+	/** 
+	 * @param $list RevDel_List
+	 * @param $row DB result row
+	 */
+	public function __construct( $list, $row ) {
+		$this->special = $list->special;
+		$this->list = $list;
+		$this->row = $row;
+	}
+
+	/**
+	 * Get the ID, as it would appear in the ids URL parameter
+	 */
+	public function getId() {
+		$field = $this->list->getIdField();
+		return $this->row->$field;
+	}
+
+	/**
+	 * Get the date, formatted with $wgLang
+	 */
+	public function formatDate() {
+		global $wgLang;
+		return $wgLang->date( $this->getTimestamp() );
+	}
+
+	/**
+	 * Get the time, formatted with $wgLang
+	 */
+	public function formatTime() {
+		global $wgLang;
+		return $wgLang->time( $this->getTimestamp() );
+	}
+
+	/**
+	 * Get the timestamp in MW 14-char form
+	 */
+	public function getTimestamp() {
+		$field = $this->list->getTimestampField();
+		return wfTimestamp( TS_MW, $this->row->$field );
+	}
+	
+	/**
+	 * Get the author user ID
+	 */	
+	public function getAuthorId() {
+		$field = $this->list->getAuthorIdField();
+		return intval( $this->row->$field );
+	}
+
+	/**
+	 * Get the author user name
+	 */	
+	public function getAuthorName() {
+		$field = $this->list->getAuthorNameField();
+		return strval( $this->row->$field );
+	}
+
+	/** 
+	 * Returns true if the item is "current", and the operation to set the given
+	 * bits can't be executed for that reason
+	 * STUB
+	 */
+	public function isHideCurrentOp( $newBits ) {
+		return false;
+	}
+
+	/**
+	 * Returns true if the current user can view the item
+	 */
+	abstract public function canView();
+	
+	/**
+	 * Returns true if the current user can view the item text/file
+	 */
+	abstract public function canViewContent();
+
+	/**
+	 * Get the current deletion bitfield value
+	 */
+	abstract public function getBits();
+
+	/**
+	 * Get the HTML of the list item. Should be include <li></li> tags.
+	 * This is used to show the list in HTML form, by the special page.
+	 */
+	abstract public function getHTML();
+
+	/**
+	 * Set the visibility of the item. This should do any necessary DB queries.
+	 *
+	 * The DB update query should have a condition which forces it to only update
+	 * if the value in the DB matches the value fetched earlier with the SELECT. 
+	 * If the update fails because it did not match, the function should return 
+	 * false. This prevents concurrency problems.
+	 *
+	 * @return boolean success
+	 */
+	abstract public function setBits( $newBits );
+}
diff --git a/includes/revisiondelete/RevisionDeleter.php b/includes/revisiondelete/RevisionDeleter.php
new file mode 100644
index 00000000..d47fcecf
--- /dev/null
+++ b/includes/revisiondelete/RevisionDeleter.php
@@ -0,0 +1,270 @@
+<?php
+/**
+ * Revision/log/file deletion backend
+ *
+ * @file
+ */
+
+/**
+ * Temporary b/c interface, collection of static functions.
+ * @ingroup SpecialPage
+ */
+class RevisionDeleter {
+	/**
+	 * Checks for a change in the bitfield for a certain option and updates the
+	 * provided array accordingly.
+	 *
+	 * @param $desc String: description to add to the array if the option was
+	 * enabled / disabled.
+	 * @param $field Integer: the bitmask describing the single option.
+	 * @param $diff Integer: the xor of the old and new bitfields.
+	 * @param $new Integer: the new bitfield 
+	 * @param $arr Array: the array to update.
+	 */
+	protected static function checkItem( $desc, $field, $diff, $new, &$arr ) {
+		if( $diff & $field ) {
+			$arr[ ( $new & $field ) ? 0 : 1 ][] = $desc;
+		}
+	}
+
+	/**
+	 * Gets an array of message keys describing the changes made to the visibility
+	 * of the revision. If the resulting array is $arr, then $arr[0] will contain an 
+	 * array of strings describing the items that were hidden, $arr[2] will contain 
+	 * an array of strings describing the items that were unhidden, and $arr[3] will 
+	 * contain an array with a single string, which can be one of "applied 
+	 * restrictions to sysops", "removed restrictions from sysops", or null.
+	 *
+	 * @param $n Integer: the new bitfield.
+	 * @param $o Integer: the old bitfield.
+	 * @return An array as described above.
+	 */
+	protected static function getChanges( $n, $o ) {
+		$diff = $n ^ $o;
+		$ret = array( 0 => array(), 1 => array(), 2 => array() );
+		// Build bitfield changes in language
+		self::checkItem( 'revdelete-content',
+			Revision::DELETED_TEXT, $diff, $n, $ret );
+		self::checkItem( 'revdelete-summary',
+			Revision::DELETED_COMMENT, $diff, $n, $ret );
+		self::checkItem( 'revdelete-uname',
+			Revision::DELETED_USER, $diff, $n, $ret );
+		// Restriction application to sysops
+		if( $diff & Revision::DELETED_RESTRICTED ) {
+			if( $n & Revision::DELETED_RESTRICTED )
+				$ret[2][] = 'revdelete-restricted';
+			else
+				$ret[2][] = 'revdelete-unrestricted';
+		}
+		return $ret;
+	}
+
+	/**
+	 * Gets a log message to describe the given revision visibility change. This
+	 * message will be of the form "[hid {content, edit summary, username}];
+	 * [unhid {...}][applied restrictions to sysops] for $count revisions: $comment".
+	 *
+	 * @param $count Integer: The number of effected revisions.
+	 * @param $nbitfield Integer: The new bitfield for the revision.
+	 * @param $obitfield Integer: The old bitfield for the revision.
+	 * @param $isForLog Boolean
+	 * @param $forContent Boolean
+	 */
+	public static function getLogMessage( $count, $nbitfield, $obitfield, $isForLog = false, $forContent = false ) {
+		global $wgLang, $wgContLang;
+		
+		$lang = $forContent ? $wgContLang : $wgLang;
+		$msgFunc = $forContent ? "wfMsgForContent" : "wfMsg";
+		
+		$changes = self::getChanges( $nbitfield, $obitfield );
+		array_walk($changes, 'RevisionDeleter::expandMessageArray', $forContent);
+		
+		$changesText = array();
+		
+		if( count( $changes[0] ) ) {
+			$changesText[] = $msgFunc( 'revdelete-hid', $lang->commaList( $changes[0] ) );
+		}
+		if( count( $changes[1] ) ) {
+			$changesText[] = $msgFunc( 'revdelete-unhid', $lang->commaList( $changes[1] ) );
+		}
+		
+		$s = $lang->semicolonList( $changesText );
+		if( count( $changes[2] ) ) {
+			$s .= $s ? ' (' . $changes[2][0] . ')' : ' ' . $changes[2][0];
+		}
+		
+		$msg = $isForLog ? 'logdelete-log-message' : 'revdelete-log-message';
+		return wfMsgExt( $msg, $forContent ? array( 'parsemag', 'content' ) : array( 'parsemag' ), $s, $lang->formatNum($count) );
+	}
+	
+	private static function expandMessageArray(& $msg, $key, $forContent) {
+		if ( is_array ($msg) ) {
+			array_walk($msg, 'RevisionDeleter::expandMessageArray', $forContent);
+		} else {
+			if ( $forContent ) {
+				$msg = wfMsgForContent($msg);
+			} else {
+				$msg = wfMsg($msg);
+			}
+		}
+	}
+	
+	// Get DB field name for URL param...
+	// Future code for other things may also track
+	// other types of revision-specific changes.
+	// @returns string One of log_id/rev_id/fa_id/ar_timestamp/oi_archive_name
+	public static function getRelationType( $typeName ) {
+		if ( isset( SpecialRevisionDelete::$deprecatedTypeMap[$typeName] ) ) {
+			$typeName = SpecialRevisionDelete::$deprecatedTypeMap[$typeName];
+		}
+		if ( isset( SpecialRevisionDelete::$allowedTypes[$typeName] ) ) {
+			$class = SpecialRevisionDelete::$allowedTypes[$typeName]['list-class'];
+			$list = new $class( null, null, null );
+			return $list->getIdField();
+		} else {
+			return null;
+		}
+	}
+	
+	// Checks if a revision still exists in the revision table.
+	//  If it doesn't, returns the corresponding ar_timestamp field
+	//  so that this key can be used instead.
+	public static function checkRevisionExistence( $title, $revid ) {
+		$dbr = wfGetDB( DB_SLAVE );
+		$exists = $dbr->selectField( 'revision', '1',
+				array( 'rev_id' => $revid ), __METHOD__ );
+				
+		if ( $exists ) {
+			return true;
+		}
+		
+		$timestamp = $dbr->selectField( 'archive', 'ar_timestamp',
+				array( 'ar_namespace' => $title->getNamespace(),
+					'ar_title' => $title->getDBkey(),
+					'ar_rev_id' => $revid ), __METHOD__ );
+		
+		return $timestamp;
+	}
+	
+	// Creates utility links for log entries.
+	public static function getLogLinks( $title, $paramArray, $skin, $messages ) {
+		global $wgLang;
+		
+		if( count($paramArray) >= 2 ) {
+			// Different revision types use different URL params...
+			$originalKey = $key = $paramArray[0];
+			// $paramArray[1] is a CSV of the IDs
+			$Ids = explode( ',', $paramArray[1] );
+
+			$revert = array();
+			
+			// For if undeleted revisions are found amidst deleted ones.
+			$undeletedRevisions = array();
+			
+			// This is not going to work if some revs are deleted and some
+			//  aren't.
+			if ($key == 'revision') {
+				foreach( $Ids as $k => $id ) {
+					$existResult =
+						self::checkRevisionExistence( $title, $id );
+					
+					if ($existResult !== true) {
+						$key = 'archive';
+						$Ids[$k] = $existResult;
+					} else {
+						// Undeleted revision amidst deleted ones
+						unset($Ids[$k]);
+						$undeletedRevisions[] = $id;
+					}
+				}
+				
+				if ( $key == $originalKey ) {
+					$Ids = $undeletedRevisions;
+					$undeletedRevisions = array();
+				}
+			}
+			
+			// Diff link for single rev deletions
+			if( count($Ids) == 1 && !count($undeletedRevisions) ) {
+				// Live revision diffs...
+				if( in_array( $key, array( 'oldid', 'revision' ) ) ) {
+					$revert[] = $skin->link(
+						$title,
+						$messages['diff'],
+						array(),
+						array(
+							'diff' => intval( $Ids[0] ),
+							'unhide' => 1
+						),
+						array( 'known', 'noclasses' )
+					);
+				// Deleted revision diffs...
+				} else if( in_array( $key, array( 'artimestamp','archive' ) ) ) {
+					$revert[] = $skin->link(
+						SpecialPage::getTitleFor( 'Undelete' ),
+						$messages['diff'], 
+						array(),
+						array(
+							'target'    => $title->getPrefixedDBKey(),
+							'diff'      => 'prev',
+							'timestamp' => $Ids[0]
+						),
+						array( 'known', 'noclasses' )
+					);
+				}
+			}
+			
+			// View/modify link...
+			if ( count($undeletedRevisions) ) {
+				// FIXME THIS IS A HORRIBLE HORRIBLE HACK AND SHOULD DIE
+				// It's not possible to pass a list of both deleted and
+				// undeleted revisions to SpecialRevisionDelete, so we're
+				// stuck with two links. See bug 23363.
+				$restoreLinks = array();
+				
+				$restoreLinks[] = $skin->link(
+					SpecialPage::getTitleFor( 'Revisiondelete' ),
+					$messages['revdel-restore-visible'],
+					array(),
+					array(
+						'target' => $title->getPrefixedText(),
+						'type' => $originalKey,
+						'ids' => implode(',', $undeletedRevisions),
+					),
+					array( 'known', 'noclasses' )
+				);
+				
+				$restoreLinks[] = $skin->link(
+					SpecialPage::getTitleFor( 'Revisiondelete' ),
+					$messages['revdel-restore-deleted'],
+					array(),
+					array(
+						'target' => $title->getPrefixedText(),
+						'type' => $key,
+						'ids' => implode(',', $Ids),
+					),
+					array( 'known', 'noclasses' )
+				);
+				
+				$revert[] = $messages['revdel-restore'] . ' [' .
+						$wgLang->pipeList( $restoreLinks ) . ']';
+			} else {
+				$revert[] = $skin->link(
+					SpecialPage::getTitleFor( 'Revisiondelete' ),
+					$messages['revdel-restore'],
+					array(),
+					array(
+						'target' => $title->getPrefixedText(),
+						'type' => $key,
+						'ids' => implode(',', $Ids),
+					),
+					array( 'known', 'noclasses' )
+				);
+			}
+			
+			// Pipe links
+			return wfMsg( 'parentheses', $wgLang->pipeList( $revert ) );
+		}
+		return '';
+	}
+}
\ No newline at end of file