updated to MediaWiki 1.14.0

1 files changed, 1133 insertions, 0 deletions

diff --git a/includes/Import.php b/includes/Import.php
new file mode 100644
index 00000000..56e7a7fb
--- /dev/null
+++ b/includes/Import.php
@@ -0,0 +1,1133 @@
+<?php
+/**
+ * MediaWiki page data importer
+ * Copyright (C) 2003,2005 Brion Vibber <brion@pobox.com>
+ * http://www.mediawiki.org/
+ *
+ * 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
+ * @ingroup SpecialPage
+ */
+
+/**
+ *
+ * @ingroup SpecialPage
+ */
+class WikiRevision {
+	var $title = null;
+	var $id = 0;
+	var $timestamp = "20010115000000";
+	var $user = 0;
+	var $user_text = "";
+	var $text = "";
+	var $comment = "";
+	var $minor = false;
+	var $type = "";
+	var $action = "";
+	var $params = "";
+
+	function setTitle( $title ) {
+		if( is_object( $title ) ) {
+			$this->title = $title;
+		} elseif( is_null( $title ) ) {
+			throw new MWException( "WikiRevision given a null title in import. You may need to adjust \$wgLegalTitleChars." );
+		} else {
+			throw new MWException( "WikiRevision given non-object title in import." );
+		}
+	}
+
+	function setID( $id ) {
+		$this->id = $id;
+	}
+
+	function setTimestamp( $ts ) {
+		# 2003-08-05T18:30:02Z
+		$this->timestamp = wfTimestamp( TS_MW, $ts );
+	}
+
+	function setUsername( $user ) {
+		$this->user_text = $user;
+	}
+
+	function setUserIP( $ip ) {
+		$this->user_text = $ip;
+	}
+
+	function setText( $text ) {
+		$this->text = $text;
+	}
+
+	function setComment( $text ) {
+		$this->comment = $text;
+	}
+
+	function setMinor( $minor ) {
+		$this->minor = (bool)$minor;
+	}
+
+	function setSrc( $src ) {
+		$this->src = $src;
+	}
+
+	function setFilename( $filename ) {
+		$this->filename = $filename;
+	}
+
+	function setSize( $size ) {
+		$this->size = intval( $size );
+	}
+	
+	function setType( $type ) {
+		$this->type = $type;
+	}
+	
+	function setAction( $action ) {
+		$this->action = $action;
+	}
+	
+	function setParams( $params ) {
+		$this->params = $params;
+	}
+
+	function getTitle() {
+		return $this->title;
+	}
+
+	function getID() {
+		return $this->id;
+	}
+
+	function getTimestamp() {
+		return $this->timestamp;
+	}
+
+	function getUser() {
+		return $this->user_text;
+	}
+
+	function getText() {
+		return $this->text;
+	}
+
+	function getComment() {
+		return $this->comment;
+	}
+
+	function getMinor() {
+		return $this->minor;
+	}
+
+	function getSrc() {
+		return $this->src;
+	}
+
+	function getFilename() {
+		return $this->filename;
+	}
+
+	function getSize() {
+		return $this->size;
+	}
+	
+	function getType() {
+		return $this->type;
+	}
+	
+	function getAction() {
+		return $this->action;
+	}
+	
+	function getParams() {
+		return $this->params;
+	}
+
+	function importOldRevision() {
+		$dbw = wfGetDB( DB_MASTER );
+
+		# Sneak a single revision into place
+		$user = User::newFromName( $this->getUser() );
+		if( $user ) {
+			$userId = intval( $user->getId() );
+			$userText = $user->getName();
+		} else {
+			$userId = 0;
+			$userText = $this->getUser();
+		}
+
+		// avoid memory leak...?
+		$linkCache = LinkCache::singleton();
+		$linkCache->clear();
+
+		$article = new Article( $this->title );
+		$pageId = $article->getId();
+		if( $pageId == 0 ) {
+			# must create the page...
+			$pageId = $article->insertOn( $dbw );
+			$created = true;
+		} else {
+			$created = false;
+
+			$prior = $dbw->selectField( 'revision', '1',
+				array( 'rev_page' => $pageId,
+					'rev_timestamp' => $dbw->timestamp( $this->timestamp ),
+					'rev_user_text' => $userText,
+					'rev_comment'   => $this->getComment() ),
+				__METHOD__
+			);
+			if( $prior ) {
+				// FIXME: this could fail slightly for multiple matches :P
+				wfDebug( __METHOD__ . ": skipping existing revision for [[" .
+					$this->title->getPrefixedText() . "]], timestamp " . $this->timestamp . "\n" );
+				return false;
+			}
+		}
+
+		# FIXME: Use original rev_id optionally (better for backups)
+		# Insert the row
+		$revision = new Revision( array(
+			'page'       => $pageId,
+			'text'       => $this->getText(),
+			'comment'    => $this->getComment(),
+			'user'       => $userId,
+			'user_text'  => $userText,
+			'timestamp'  => $this->timestamp,
+			'minor_edit' => $this->minor,
+			) );
+		$revId = $revision->insertOn( $dbw );
+		$changed = $article->updateIfNewerOn( $dbw, $revision );
+		
+		# To be on the safe side...
+		$tempTitle = $GLOBALS['wgTitle'];
+		$GLOBALS['wgTitle'] = $this->title;
+
+		if( $created ) {
+			wfDebug( __METHOD__ . ": running onArticleCreate\n" );
+			Article::onArticleCreate( $this->title );
+
+			wfDebug( __METHOD__ . ": running create updates\n" );
+			$article->createUpdates( $revision );
+
+		} elseif( $changed ) {
+			wfDebug( __METHOD__ . ": running onArticleEdit\n" );
+			Article::onArticleEdit( $this->title, 'skiptransclusions' ); // leave templatelinks for editUpdates()
+
+			wfDebug( __METHOD__ . ": running edit updates\n" );
+			$article->editUpdates(
+				$this->getText(),
+				$this->getComment(),
+				$this->minor,
+				$this->timestamp,
+				$revId );
+		}
+		$GLOBALS['wgTitle'] = $tempTitle;
+
+		return true;
+	}
+	
+	function importLogItem() {
+		$dbw = wfGetDB( DB_MASTER );
+		# FIXME: this will not record autoblocks
+		if( !$this->getTitle() ) {
+			wfDebug( __METHOD__ . ": skipping invalid {$this->type}/{$this->action} log time, timestamp " . 
+				$this->timestamp . "\n" );
+			return;
+		}
+		# Check if it exists already
+		// FIXME: use original log ID (better for backups)
+		$prior = $dbw->selectField( 'logging', '1',
+			array( 'log_type' => $this->getType(),
+				'log_action'    => $this->getAction(),
+				'log_timestamp' => $dbw->timestamp( $this->timestamp ),
+				'log_namespace' => $this->getTitle()->getNamespace(),
+				'log_title'     => $this->getTitle()->getDBkey(),
+				'log_comment'   => $this->getComment(),
+				#'log_user_text' => $this->user_text,
+				'log_params'    => $this->params ),
+			__METHOD__
+		);
+		// FIXME: this could fail slightly for multiple matches :P
+		if( $prior ) {
+			wfDebug( __METHOD__ . ": skipping existing item for Log:{$this->type}/{$this->action}, timestamp " . 
+				$this->timestamp . "\n" );
+			return false;
+		}
+		$log_id = $dbw->nextSequenceValue( 'log_log_id_seq' );
+		$data = array(
+			'log_id' => $log_id,
+			'log_type' => $this->type,
+			'log_action' => $this->action,
+			'log_timestamp' => $dbw->timestamp( $this->timestamp ),
+			'log_user' => User::idFromName( $this->user_text ),
+			#'log_user_text' => $this->user_text,
+			'log_namespace' => $this->getTitle()->getNamespace(),
+			'log_title' => $this->getTitle()->getDBkey(),
+			'log_comment' => $this->getComment(),
+			'log_params' => $this->params
+		);
+		$dbw->insert( 'logging', $data, __METHOD__ );
+	}
+
+	function importUpload() {
+		wfDebug( __METHOD__ . ": STUB\n" );
+
+		/**
+			// from file revert...
+			$source = $this->file->getArchiveVirtualUrl( $this->oldimage );
+			$comment = $wgRequest->getText( 'wpComment' );
+			// TODO: Preserve file properties from database instead of reloading from file
+			$status = $this->file->upload( $source, $comment, $comment );
+			if( $status->isGood() ) {
+		*/
+
+		/**
+			// from file upload...
+		$this->mLocalFile = wfLocalFile( $nt );
+		$this->mDestName = $this->mLocalFile->getName();
+		//....
+			$status = $this->mLocalFile->upload( $this->mTempPath, $this->mComment, $pageText,
+			File::DELETE_SOURCE, $this->mFileProps );
+			if ( !$status->isGood() ) {
+				$resultDetails = array( 'internal' => $status->getWikiText() );
+		*/
+
+		// @fixme upload() uses $wgUser, which is wrong here
+		// it may also create a page without our desire, also wrong potentially.
+		// and, it will record a *current* upload, but we might want an archive version here
+
+		$file = wfLocalFile( $this->getTitle() );
+		if( !$file ) {
+			var_dump( $file );
+			wfDebug( "IMPORT: Bad file. :(\n" );
+			return false;
+		}
+
+		$source = $this->downloadSource();
+		if( !$source ) {
+			wfDebug( "IMPORT: Could not fetch remote file. :(\n" );
+			return false;
+		}
+
+		$status = $file->upload( $source,
+			$this->getComment(),
+			$this->getComment(), // Initial page, if none present...
+			File::DELETE_SOURCE,
+			false, // props...
+			$this->getTimestamp() );
+
+		if( $status->isGood() ) {
+			// yay?
+			wfDebug( "IMPORT: is ok?\n" );
+			return true;
+		}
+
+		wfDebug( "IMPORT: is bad? " . $status->getXml() . "\n" );
+		return false;
+
+	}
+
+	function downloadSource() {
+		global $wgEnableUploads;
+		if( !$wgEnableUploads ) {
+			return false;
+		}
+
+		$tempo = tempnam( wfTempDir(), 'download' );
+		$f = fopen( $tempo, 'wb' );
+		if( !$f ) {
+			wfDebug( "IMPORT: couldn't write to temp file $tempo\n" );
+			return false;
+		}
+
+		// @fixme!
+		$src = $this->getSrc();
+		$data = Http::get( $src );
+		if( !$data ) {
+			wfDebug( "IMPORT: couldn't fetch source $src\n" );
+			fclose( $f );
+			unlink( $tempo );
+			return false;
+		}
+
+		fwrite( $f, $data );
+		fclose( $f );
+
+		return $tempo;
+	}
+
+}
+
+/**
+ * implements Special:Import
+ * @ingroup SpecialPage
+ */
+class WikiImporter {
+	var $mDebug = false;
+	var $mSource = null;
+	var $mPageCallback = null;
+	var $mPageOutCallback = null;
+	var $mRevisionCallback = null;
+	var $mLogItemCallback = null;
+	var $mUploadCallback = null;
+	var $mTargetNamespace = null;
+	var $mXmlNamespace = false;
+	var $lastfield;
+	var $tagStack = array();
+
+	function __construct( $source ) {
+		$this->setRevisionCallback( array( $this, "importRevision" ) );
+		$this->setUploadCallback( array( $this, "importUpload" ) );
+		$this->setLogItemCallback( array( $this, "importLogItem" ) );
+		$this->mSource = $source;
+	}
+
+	function throwXmlError( $err ) {
+		$this->debug( "FAILURE: $err" );
+		wfDebug( "WikiImporter XML error: $err\n" );
+	}
+
+	function handleXmlNamespace ( $parser, $data, $prefix=false, $uri=false ) {
+    		 if( preg_match( '/www.mediawiki.org/',$prefix ) ) {
+	                $prefix = str_replace( '/','\/',$prefix );
+			$this->mXmlNamespace='/^'.$prefix.':/';
+		 }
+	}
+
+	function stripXmlNamespace($name) {
+		if( $this->mXmlNamespace ) {
+	               return(preg_replace($this->mXmlNamespace,'',$name,1));
+		}
+		else {
+		       return($name);
+                }
+	}
+   
+	# --------------
+
+	function doImport() {
+		if( empty( $this->mSource ) ) {
+			return new WikiErrorMsg( "importnotext" );
+		}
+
+		$parser = xml_parser_create_ns( "UTF-8" );
+
+		# case folding violates XML standard, turn it off
+		xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
+
+		xml_set_object( $parser, $this );
+		xml_set_element_handler( $parser, "in_start", "" );
+		xml_set_start_namespace_decl_handler( $parser, "handleXmlNamespace" );
+
+		$offset = 0; // for context extraction on error reporting
+		do {
+			$chunk = $this->mSource->readChunk();
+			if( !xml_parse( $parser, $chunk, $this->mSource->atEnd() ) ) {
+				wfDebug( "WikiImporter::doImport encountered XML parsing error\n" );
+				return new WikiXmlError( $parser, wfMsgHtml( 'import-parse-failure' ), $chunk, $offset );
+			}
+			$offset += strlen( $chunk );
+		} while( $chunk !== false && !$this->mSource->atEnd() );
+		xml_parser_free( $parser );
+
+		return true;
+	}
+
+	function debug( $data ) {
+		if( $this->mDebug ) {
+			wfDebug( "IMPORT: $data\n" );
+		}
+	}
+
+	function notice( $data ) {
+		global $wgCommandLineMode;
+		if( $wgCommandLineMode ) {
+			print "$data\n";
+		} else {
+			global $wgOut;
+			$wgOut->addHTML( "<li>" . htmlspecialchars( $data ) . "</li>\n" );
+		}
+	}
+
+	/**
+	 * Set debug mode...
+	 */
+	function setDebug( $debug ) {
+		$this->mDebug = $debug;
+	}
+
+	/**
+	 * Sets the action to perform as each new page in the stream is reached.
+	 * @param $callback callback
+	 * @return callback
+	 */
+	function setPageCallback( $callback ) {
+		$previous = $this->mPageCallback;
+		$this->mPageCallback = $callback;
+		return $previous;
+	}
+
+	/**
+	 * Sets the action to perform as each page in the stream is completed.
+	 * Callback accepts the page title (as a Title object), a second object
+	 * with the original title form (in case it's been overridden into a
+	 * local namespace), and a count of revisions.
+	 *
+	 * @param $callback callback
+	 * @return callback
+	 */
+	function setPageOutCallback( $callback ) {
+		$previous = $this->mPageOutCallback;
+		$this->mPageOutCallback = $callback;
+		return $previous;
+	}
+
+	/**
+	 * Sets the action to perform as each page revision is reached.
+	 * @param $callback callback
+	 * @return callback
+	 */
+	function setRevisionCallback( $callback ) {
+		$previous = $this->mRevisionCallback;
+		$this->mRevisionCallback = $callback;
+		return $previous;
+	}
+
+	/**
+	 * Sets the action to perform as each file upload version is reached.
+	 * @param $callback callback
+	 * @return callback
+	 */
+	function setUploadCallback( $callback ) {
+		$previous = $this->mUploadCallback;
+		$this->mUploadCallback = $callback;
+		return $previous;
+	}
+	
+	/**
+	 * Sets the action to perform as each log item reached.
+	 * @param $callback callback
+	 * @return callback
+	 */
+	function setLogItemCallback( $callback ) {
+		$previous = $this->mLogItemCallback;
+		$this->mLogItemCallback = $callback;
+		return $previous;
+	}
+
+	/**
+	 * Set a target namespace to override the defaults
+	 */
+	function setTargetNamespace( $namespace ) {
+		if( is_null( $namespace ) ) {
+			// Don't override namespaces
+			$this->mTargetNamespace = null;
+		} elseif( $namespace >= 0 ) {
+			// FIXME: Check for validity
+			$this->mTargetNamespace = intval( $namespace );
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Default per-revision callback, performs the import.
+	 * @param $revision WikiRevision
+	 * @private
+	 */
+	function importRevision( $revision ) {
+		$dbw = wfGetDB( DB_MASTER );
+		return $dbw->deadlockLoop( array( $revision, 'importOldRevision' ) );
+	}
+	
+	/**
+	 * Default per-revision callback, performs the import.
+	 * @param $revision WikiRevision
+	 * @private
+	 */
+	function importLogItem( $rev ) {
+		$dbw = wfGetDB( DB_MASTER );
+		return $dbw->deadlockLoop( array( $rev, 'importLogItem' ) );
+	}
+
+	/**
+	 * Dummy for now...
+	 */
+	function importUpload( $revision ) {
+		//$dbw = wfGetDB( DB_MASTER );
+		//return $dbw->deadlockLoop( array( $revision, 'importUpload' ) );
+		return false;
+	}
+
+	/**
+	 * Alternate per-revision callback, for debugging.
+	 * @param $revision WikiRevision
+	 * @private
+	 */
+	function debugRevisionHandler( &$revision ) {
+		$this->debug( "Got revision:" );
+		if( is_object( $revision->title ) ) {
+			$this->debug( "-- Title: " . $revision->title->getPrefixedText() );
+		} else {
+			$this->debug( "-- Title: <invalid>" );
+		}
+		$this->debug( "-- User: " . $revision->user_text );
+		$this->debug( "-- Timestamp: " . $revision->timestamp );
+		$this->debug( "-- Comment: " . $revision->comment );
+		$this->debug( "-- Text: " . $revision->text );
+	}
+
+	/**
+	 * Notify the callback function when a new <page> is reached.
+	 * @param $title Title
+	 * @private
+	 */
+	function pageCallback( $title ) {
+		if( is_callable( $this->mPageCallback ) ) {
+			call_user_func( $this->mPageCallback, $title );
+		}
+	}
+
+	/**
+	 * Notify the callback function when a </page> is closed.
+	 * @param $title Title
+	 * @param $origTitle Title
+	 * @param $revisionCount int
+	 * @param $successCount Int: number of revisions for which callback returned true
+	 * @private
+	 */
+	function pageOutCallback( $title, $origTitle, $revisionCount, $successCount ) {
+		if( is_callable( $this->mPageOutCallback ) ) {
+			call_user_func( $this->mPageOutCallback, $title, $origTitle,
+				$revisionCount, $successCount );
+		}
+	}
+
+	# XML parser callbacks from here out -- beware!
+	function donothing( $parser, $x, $y="" ) {
+		#$this->debug( "donothing" );
+	}
+
+	function in_start( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_start $name" );
+		if( $name != "mediawiki" ) {
+			return $this->throwXMLerror( "Expected <mediawiki>, got <$name>" );
+		}
+		xml_set_element_handler( $parser, "in_mediawiki", "out_mediawiki" );
+	}
+
+	function in_mediawiki( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_mediawiki $name" );
+		if( $name == 'siteinfo' ) {
+			xml_set_element_handler( $parser, "in_siteinfo", "out_siteinfo" );
+		} elseif( $name == 'page' ) {
+			$this->push( $name );
+			$this->workRevisionCount = 0;
+			$this->workSuccessCount = 0;
+			$this->uploadCount = 0;
+			$this->uploadSuccessCount = 0;
+			xml_set_element_handler( $parser, "in_page", "out_page" );
+		} elseif( $name == 'logitem' ) {
+			$this->push( $name );
+			$this->workRevision = new WikiRevision;
+			xml_set_element_handler( $parser, "in_logitem", "out_logitem" );
+		} else {
+			return $this->throwXMLerror( "Expected <page>, got <$name>" );
+		}
+	}
+	function out_mediawiki( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "out_mediawiki $name" );
+		if( $name != "mediawiki" ) {
+			return $this->throwXMLerror( "Expected </mediawiki>, got </$name>" );
+		}
+		xml_set_element_handler( $parser, "donothing", "donothing" );
+	}
+
+
+	function in_siteinfo( $parser, $name, $attribs ) {
+		// no-ops for now
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_siteinfo $name" );
+		switch( $name ) {
+		case "sitename":
+		case "base":
+		case "generator":
+		case "case":
+		case "namespaces":
+		case "namespace":
+			break;
+		default:
+			return $this->throwXMLerror( "Element <$name> not allowed in <siteinfo>." );
+		}
+	}
+
+	function out_siteinfo( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		if( $name == "siteinfo" ) {
+			xml_set_element_handler( $parser, "in_mediawiki", "out_mediawiki" );
+		}
+	}
+
+
+	function in_page( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_page $name" );
+		switch( $name ) {
+		case "id":
+		case "title":
+		case "restrictions":
+			$this->appendfield = $name;
+			$this->appenddata = "";
+			xml_set_element_handler( $parser, "in_nothing", "out_append" );
+			xml_set_character_data_handler( $parser, "char_append" );
+			break;
+		case "revision":
+			$this->push( "revision" );
+			if( is_object( $this->pageTitle ) ) {
+				$this->workRevision = new WikiRevision;
+				$this->workRevision->setTitle( $this->pageTitle );
+				$this->workRevisionCount++;
+			} else {
+				// Skipping items due to invalid page title
+				$this->workRevision = null;
+			}
+			xml_set_element_handler( $parser, "in_revision", "out_revision" );
+			break;
+		case "upload":
+			$this->push( "upload" );
+			if( is_object( $this->pageTitle ) ) {
+				$this->workRevision = new WikiRevision;
+				$this->workRevision->setTitle( $this->pageTitle );
+				$this->uploadCount++;
+			} else {
+				// Skipping items due to invalid page title
+				$this->workRevision = null;
+			}
+			xml_set_element_handler( $parser, "in_upload", "out_upload" );
+			break;
+		default:
+			return $this->throwXMLerror( "Element <$name> not allowed in a <page>." );
+		}
+	}
+
+	function out_page( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "out_page $name" );
+		$this->pop();
+		if( $name != "page" ) {
+			return $this->throwXMLerror( "Expected </page>, got </$name>" );
+		}
+		xml_set_element_handler( $parser, "in_mediawiki", "out_mediawiki" );
+
+		$this->pageOutCallback( $this->pageTitle, $this->origTitle,
+			$this->workRevisionCount, $this->workSuccessCount );
+
+		$this->workTitle = null;
+		$this->workRevision = null;
+		$this->workRevisionCount = 0;
+		$this->workSuccessCount = 0;
+		$this->pageTitle = null;
+		$this->origTitle = null;
+	}
+
+	function in_nothing( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_nothing $name" );
+		return $this->throwXMLerror( "No child elements allowed here; got <$name>" );
+	}
+
+	function char_append( $parser, $data ) {
+		$this->debug( "char_append '$data'" );
+		$this->appenddata .= $data;
+	}
+
+	function out_append( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "out_append $name" );
+		if( $name != $this->appendfield ) {
+			return $this->throwXMLerror( "Expected </{$this->appendfield}>, got </$name>" );
+		}
+
+		switch( $this->appendfield ) {
+		case "title":
+			$this->workTitle = $this->appenddata;
+			$this->origTitle = Title::newFromText( $this->workTitle );
+			if( !is_null( $this->mTargetNamespace ) && !is_null( $this->origTitle ) ) {
+				$this->pageTitle = Title::makeTitle( $this->mTargetNamespace,
+					$this->origTitle->getDBkey() );
+			} else {
+				$this->pageTitle = Title::newFromText( $this->workTitle );
+			}
+			if( is_null( $this->pageTitle ) ) {
+				// Invalid page title? Ignore the page
+				$this->notice( "Skipping invalid page title '$this->workTitle'" );
+			} elseif( $this->pageTitle->getInterwiki() != '' ) {
+				$this->notice( "Skipping interwiki page title '$this->workTitle'" );
+				$this->pageTitle = null;
+			} else {
+				$this->pageCallback( $this->workTitle );
+			}
+			break;
+		case "id":
+			if ( $this->parentTag() == 'revision' || $this->parentTag() == 'logitem' ) {
+				if( $this->workRevision )
+					$this->workRevision->setID( $this->appenddata );
+			}
+			break;
+		case "text":
+			if( $this->workRevision )
+				$this->workRevision->setText( $this->appenddata );
+			break;
+		case "username":
+			if( $this->workRevision )
+				$this->workRevision->setUsername( $this->appenddata );
+			break;
+		case "ip":
+			if( $this->workRevision )
+				$this->workRevision->setUserIP( $this->appenddata );
+			break;
+		case "timestamp":
+			if( $this->workRevision )
+				$this->workRevision->setTimestamp( $this->appenddata );
+			break;
+		case "comment":
+			if( $this->workRevision )
+				$this->workRevision->setComment( $this->appenddata );
+			break;
+		case "type":
+			if( $this->workRevision )
+				$this->workRevision->setType( $this->appenddata );
+			break;
+		case "action":
+			if( $this->workRevision )
+				$this->workRevision->setAction( $this->appenddata );
+			break;
+		case "logtitle":
+			if( $this->workRevision )
+				$this->workRevision->setTitle( Title::newFromText( $this->appenddata ) );
+			break;
+		case "params":
+			if( $this->workRevision )
+				$this->workRevision->setParams( $this->appenddata );
+			break;
+		case "minor":
+			if( $this->workRevision )
+				$this->workRevision->setMinor( true );
+			break;
+		case "filename":
+			if( $this->workRevision )
+				$this->workRevision->setFilename( $this->appenddata );
+			break;
+		case "src":
+			if( $this->workRevision )
+				$this->workRevision->setSrc( $this->appenddata );
+			break;
+		case "size":
+			if( $this->workRevision )
+				$this->workRevision->setSize( intval( $this->appenddata ) );
+			break;
+		default:
+			$this->debug( "Bad append: {$this->appendfield}" );
+		}
+		$this->appendfield = "";
+		$this->appenddata = "";
+
+		$parent = $this->parentTag();
+		xml_set_element_handler( $parser, "in_$parent", "out_$parent" );
+		xml_set_character_data_handler( $parser, "donothing" );
+	}
+
+	function in_revision( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_revision $name" );
+		switch( $name ) {
+		case "id":
+		case "timestamp":
+		case "comment":
+		case "minor":
+		case "text":
+			$this->appendfield = $name;
+			xml_set_element_handler( $parser, "in_nothing", "out_append" );
+			xml_set_character_data_handler( $parser, "char_append" );
+			break;
+		case "contributor":
+			$this->push( "contributor" );
+			xml_set_element_handler( $parser, "in_contributor", "out_contributor" );
+			break;
+		default:
+			return $this->throwXMLerror( "Element <$name> not allowed in a <revision>." );
+		}
+	}
+
+	function out_revision( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "out_revision $name" );
+		$this->pop();
+		if( $name != "revision" ) {
+			return $this->throwXMLerror( "Expected </revision>, got </$name>" );
+		}
+		xml_set_element_handler( $parser, "in_page", "out_page" );
+
+		if( $this->workRevision ) {
+			$ok = call_user_func_array( $this->mRevisionCallback,
+				array( $this->workRevision, $this ) );
+			if( $ok ) {
+				$this->workSuccessCount++;
+			}
+		}
+	}
+	
+	function in_logitem( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_logitem $name" );
+		switch( $name ) {
+		case "id":
+		case "timestamp":
+		case "comment":
+		case "type":
+		case "action":
+		case "logtitle":
+		case "params":
+			$this->appendfield = $name;
+			xml_set_element_handler( $parser, "in_nothing", "out_append" );
+			xml_set_character_data_handler( $parser, "char_append" );
+			break;
+		case "contributor":
+			$this->push( "contributor" );
+			xml_set_element_handler( $parser, "in_contributor", "out_contributor" );
+			break;
+		default:
+			return $this->throwXMLerror( "Element <$name> not allowed in a <revision>." );
+		}
+	}
+
+	function out_logitem( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "out_logitem $name" );
+		$this->pop();
+		if( $name != "logitem" ) {
+			return $this->throwXMLerror( "Expected </logitem>, got </$name>" );
+		}
+		xml_set_element_handler( $parser, "in_mediawiki", "out_mediawiki" );
+
+		if( $this->workRevision ) {
+			$ok = call_user_func_array( $this->mLogItemCallback,
+				array( $this->workRevision, $this ) );
+			if( $ok ) {
+				$this->workSuccessCount++;
+			}
+		}
+	}
+
+	function in_upload( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_upload $name" );
+		switch( $name ) {
+		case "timestamp":
+		case "comment":
+		case "text":
+		case "filename":
+		case "src":
+		case "size":
+			$this->appendfield = $name;
+			xml_set_element_handler( $parser, "in_nothing", "out_append" );
+			xml_set_character_data_handler( $parser, "char_append" );
+			break;
+		case "contributor":
+			$this->push( "contributor" );
+			xml_set_element_handler( $parser, "in_contributor", "out_contributor" );
+			break;
+		default:
+			return $this->throwXMLerror( "Element <$name> not allowed in an <upload>." );
+		}
+	}
+
+	function out_upload( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "out_revision $name" );
+		$this->pop();
+		if( $name != "upload" ) {
+			return $this->throwXMLerror( "Expected </upload>, got </$name>" );
+		}
+		xml_set_element_handler( $parser, "in_page", "out_page" );
+
+		if( $this->workRevision ) {
+			$ok = call_user_func_array( $this->mUploadCallback,
+				array( $this->workRevision, $this ) );
+			if( $ok ) {
+				$this->workUploadSuccessCount++;
+			}
+		}
+	}
+
+	function in_contributor( $parser, $name, $attribs ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "in_contributor $name" );
+		switch( $name ) {
+		case "username":
+		case "ip":
+		case "id":
+			$this->appendfield = $name;
+			xml_set_element_handler( $parser, "in_nothing", "out_append" );
+			xml_set_character_data_handler( $parser, "char_append" );
+			break;
+		default:
+			$this->throwXMLerror( "Invalid tag <$name> in <contributor>" );
+		}
+	}
+
+	function out_contributor( $parser, $name ) {
+	        $name = $this->stripXmlNamespace($name);
+		$this->debug( "out_contributor $name" );
+		$this->pop();
+		if( $name != "contributor" ) {
+			return $this->throwXMLerror( "Expected </contributor>, got </$name>" );
+		}
+		$parent = $this->parentTag();
+		xml_set_element_handler( $parser, "in_$parent", "out_$parent" );
+	}
+
+	private function push( $name ) {
+		array_push( $this->tagStack, $name );
+		$this->debug( "PUSH $name" );
+	}
+
+	private function pop() {
+		$name = array_pop( $this->tagStack );
+		$this->debug( "POP $name" );
+		return $name;
+	}
+
+	private function parentTag() {
+		$name = $this->tagStack[count( $this->tagStack ) - 1];
+		$this->debug( "PARENT $name" );
+		return $name;
+	}
+
+}
+
+/**
+ * @todo document (e.g. one-sentence class description).
+ * @ingroup SpecialPage
+ */
+class ImportStringSource {
+	function __construct( $string ) {
+		$this->mString = $string;
+		$this->mRead = false;
+	}
+
+	function atEnd() {
+		return $this->mRead;
+	}
+
+	function readChunk() {
+		if( $this->atEnd() ) {
+			return false;
+		} else {
+			$this->mRead = true;
+			return $this->mString;
+		}
+	}
+}
+
+/**
+ * @todo document (e.g. one-sentence class description).
+ * @ingroup SpecialPage
+ */
+class ImportStreamSource {
+	function __construct( $handle ) {
+		$this->mHandle = $handle;
+	}
+
+	function atEnd() {
+		return feof( $this->mHandle );
+	}
+
+	function readChunk() {
+		return fread( $this->mHandle, 32768 );
+	}
+
+	static function newFromFile( $filename ) {
+		$file = @fopen( $filename, 'rt' );
+		if( !$file ) {
+			return new WikiErrorMsg( "importcantopen" );
+		}
+		return new ImportStreamSource( $file );
+	}
+
+	static function newFromUpload( $fieldname = "xmlimport" ) {
+		$upload =& $_FILES[$fieldname];
+
+		if( !isset( $upload ) || !$upload['name'] ) {
+			return new WikiErrorMsg( 'importnofile' );
+		}
+		if( !empty( $upload['error'] ) ) {
+			switch($upload['error']){
+				case 1: # The uploaded file exceeds the upload_max_filesize directive in php.ini.
+					return new WikiErrorMsg( 'importuploaderrorsize' );
+				case 2: # The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.
+					return new WikiErrorMsg( 'importuploaderrorsize' );
+				case 3: # The uploaded file was only partially uploaded
+					return new WikiErrorMsg( 'importuploaderrorpartial' );
+			    case 6: #Missing a temporary folder. Introduced in PHP 4.3.10 and PHP 5.0.3.
+			    	return new WikiErrorMsg( 'importuploaderrortemp' );
+			    # case else: # Currently impossible
+			}
+
+		}
+		$fname = $upload['tmp_name'];
+		if( is_uploaded_file( $fname ) ) {
+			return ImportStreamSource::newFromFile( $fname );
+		} else {
+			return new WikiErrorMsg( 'importnofile' );
+		}
+	}
+
+	static function newFromURL( $url, $method = 'GET' ) {
+		wfDebug( __METHOD__ . ": opening $url\n" );
+		# Use the standard HTTP fetch function; it times out
+		# quicker and sorts out user-agent problems which might
+		# otherwise prevent importing from large sites, such
+		# as the Wikimedia cluster, etc.
+		$data = Http::request( $method, $url );
+		if( $data !== false ) {
+			$file = tmpfile();
+			fwrite( $file, $data );
+			fflush( $file );
+			fseek( $file, 0 );
+			return new ImportStreamSource( $file );
+		} else {
+			return new WikiErrorMsg( 'importcantopen' );
+		}
+	}
+
+	public static function newFromInterwiki( $interwiki, $page, $history=false ) {
+		if( $page == '' ) {
+			return new WikiErrorMsg( 'import-noarticle' );
+		}
+		$link = Title::newFromText( "$interwiki:Special:Export/$page" );
+		if( is_null( $link ) || $link->getInterwiki() == '' ) {
+			return new WikiErrorMsg( 'importbadinterwiki' );
+		} else {
+			$params = $history ? 'history=1' : '';
+			$url = $link->getFullUrl( $params );
+			# For interwikis, use POST to avoid redirects.
+			return ImportStreamSource::newFromURL( $url, "POST" );
+		}
+	}
+}