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<?php
/**
* This special page (Special:ExportRDF) for MediaWiki implements an OWL-export of semantic data,
* gathered both from the annotations in articles, and from metadata already
* present in the database.
*
* @ingroup SMWSpecialPage
* @ingroup SpecialPage
*
* @author Markus Krötzsch
* @author Jeroen De Dauw
*/
class SMWSpecialOWLExport extends SpecialPage {
/// Export controller object to be used for serializing data
protected $export_controller;
public function __construct() {
parent::__construct( 'ExportRDF' );
}
public function execute( $page ) {
$this->setHeaders();
global $wgOut, $wgRequest;
$wgOut->setPageTitle( wfMessage( 'exportrdf' )->text() );
// see if we can find something to export:
$page = is_null( $page ) ? $wgRequest->getVal( 'page' ) : rawurldecode( $page );
$pages = false;
if ( !is_null( $page ) || $wgRequest->getCheck( 'page' ) ) {
$page = is_null( $page ) ? $wgRequest->getCheck( 'text' ) : $page;
if ( $page !== '' ) {
$pages = [ $page ];
}
}
if ( $pages === false && $wgRequest->getCheck( 'pages' ) ) {
$pageBlob = $wgRequest->getText( 'pages' );
if ( $pageBlob !== '' ) {
$pages = explode( "\n", $wgRequest->getText( 'pages' ) );
}
}
if ( $pages !== false ) {
$this->exportPages( $pages );
return;
} else {
$offset = $wgRequest->getVal( 'offset' );
if ( isset( $offset ) ) {
$this->startRDFExport();
$this->export_controller->printPageList( $offset );
return;
} else {
$stats = $wgRequest->getVal( 'stats' );
if ( isset( $stats ) ) {
$this->startRDFExport();
$this->export_controller->printWikiInfo();
return;
}
}
}
// Nothing exported yet; show user interface:
$this->showForm();
}
/**
* Create the HTML user interface for this special page.
*/
protected function showForm() {
global $wgOut, $wgUser, $smwgAllowRecursiveExport, $smwgExportBacklinks, $smwgExportAll;
$html = '<form name="tripleSearch" action="" method="POST">' . "\n" .
'<p>' . wfMessage( 'smw_exportrdf_docu' )->text() . "</p>\n" .
'<input type="hidden" name="postform" value="1"/>' . "\n" .
'<textarea name="pages" cols="40" rows="10"></textarea><br />' . "\n";
if ( $wgUser->isAllowed( 'delete' ) || $smwgAllowRecursiveExport ) {
$html .= '<input type="checkbox" name="recursive" value="1" id="rec"> <label for="rec">' . wfMessage( 'smw_exportrdf_recursive' )->text() . '</label></input><br />' . "\n";
}
if ( $wgUser->isAllowed( 'delete' ) || $smwgExportBacklinks ) {
$html .= '<input type="checkbox" name="backlinks" value="1" default="true" id="bl"> <label for="bl">' . wfMessage( 'smw_exportrdf_backlinks' )->text() . '</label></input><br />' . "\n";
}
if ( $wgUser->isAllowed( 'delete' ) || $smwgExportAll ) {
$html .= '<br />';
$html .= '<input type="text" name="date" value="' . date( DATE_W3C, mktime( 0, 0, 0, 1, 1, 2000 ) ) . '" id="date"> <label for="ea">' . wfMessage( 'smw_exportrdf_lastdate' )->text() . '</label></input><br />' . "\n";
}
$html .= '<br /><input type="submit" value="' . wfMessage( 'smw_exportrdf_submit' )->text() . "\"/>\n</form>";
$wgOut->addHTML( $html );
}
/**
* Prepare $wgOut for printing non-HTML data.
*/
protected function startRDFExport() {
global $wgOut, $wgRequest;
$syntax = $wgRequest->getText( 'syntax' );
if ( $syntax === '' ) {
$syntax = $wgRequest->getVal( 'syntax' );
}
$wgOut->disable();
ob_start();
if ( $syntax == 'turtle' ) {
$mimetype = 'application/x-turtle'; // may change to 'text/turtle' at some time, watch Turtle development
$serializer = new SMWTurtleSerializer();
} else { // rdfxml as default
// Only use rdf+xml mimetype if explicitly requested (browsers do
// not support it by default).
// We do not add this parameter to RDF links within the export
// though; it is only meant to help some tools to see that HTML
// included resources are RDF (from there on they should be fine).
$mimetype = ( $wgRequest->getVal( 'xmlmime' ) == 'rdf' ) ? 'application/rdf+xml' : 'application/xml';
$serializer = new SMWRDFXMLSerializer();
}
header( "Content-type: $mimetype; charset=UTF-8" );
$this->export_controller = new SMWExportController( $serializer );
}
/**
* Export the given pages to RDF.
* @param array $pages containing the string names of pages to be exported
*/
protected function exportPages( $pages ) {
global $wgRequest, $smwgExportBacklinks, $wgUser, $smwgAllowRecursiveExport;
// Effect: assume "no" from missing parameters generated by checkboxes.
$postform = $wgRequest->getText( 'postform' ) == 1;
$recursive = 0; // default, no recursion
$rec = $wgRequest->getText( 'recursive' );
if ( $rec === '' ) {
$rec = $wgRequest->getVal( 'recursive' );
}
if ( ( $rec == '1' ) && ( $smwgAllowRecursiveExport || $wgUser->isAllowed( 'delete' ) ) ) {
$recursive = 1; // users may be allowed to switch it on
}
$backlinks = $smwgExportBacklinks; // default
$bl = $wgRequest->getText( 'backlinks' );
if ( $bl === '' ) {
// TODO: wtf? this does not make a lot of sense...
$bl = $wgRequest->getVal( 'backlinks' );
}
if ( ( $bl == '1' ) && ( $wgUser->isAllowed( 'delete' ) ) ) {
$backlinks = true; // admins can always switch on backlinks
} elseif ( ( $bl == '0' ) || ( '' == $bl && $postform ) ) {
$backlinks = false; // everybody can explicitly switch off backlinks
}
$date = $wgRequest->getText( 'date' );
if ( $date === '' ) {
$date = $wgRequest->getVal( 'date' );
}
if ( $date !== '' ) {
$timeint = strtotime( $date );
$stamp = date( "YmdHis", $timeint );
$date = $stamp;
}
// If it is a redirect then we don't want to generate triples other than
// the redirect target information
if ( isset( $pages[0] ) && ( $title = Title::newFromText( $pages[0] ) ) !== null && $title->isRedirect() ) {
$backlinks = false;
}
$this->startRDFExport();
$this->export_controller->enableBacklinks( $backlinks );
$this->export_controller->printPages( $pages, $recursive, $date );
}
protected function getGroupName() {
return 'smw_group';
}
}
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