* @ingroup SpecialPage
*/
+use Wikimedia\Rdbms\ResultWrapper;
+use Wikimedia\Rdbms\IDatabase;
+
/**
* A special page listing redirects to redirecting page.
* The software will automatically not follow double redirects, to prevent loops.
*
* @ingroup SpecialPage
*/
-class DoubleRedirectsPage extends PageQueryPage {
-
- function getName() {
- return 'DoubleRedirects';
+class DoubleRedirectsPage extends QueryPage {
+ function __construct( $name = 'DoubleRedirects' ) {
+ parent::__construct( $name );
}
- function isExpensive( ) { return true; }
- function isSyndicated() { return false; }
+ public function isExpensive() {
+ return true;
+ }
- function getPageHeader( ) {
- return wfMsgExt( 'doubleredirectstext', array( 'parse' ) );
+ function isSyndicated() {
+ return false;
}
- function getSQLText( &$dbr, $namespace = null, $title = null ) {
+ function sortDescending() {
+ return false;
+ }
- list( $page, $redirect ) = $dbr->tableNamesN( 'page', 'redirect' );
+ function getPageHeader() {
+ return $this->msg( 'doubleredirectstext' )->parseAsBlock();
+ }
+ function reallyGetQueryInfo( $namespace = null, $title = null ) {
$limitToTitle = !( $namespace === null && $title === null );
- $sql = $limitToTitle ? "SELECT" : "SELECT 'DoubleRedirects' as type," ;
- $sql .=
- " pa.page_namespace as namespace, pa.page_title as title," .
- " pb.page_namespace as nsb, pb.page_title as tb," .
- " pc.page_namespace as nsc, pc.page_title as tc" .
- " FROM $redirect AS ra, $redirect AS rb, $page AS pa, $page AS pb, $page AS pc" .
- " WHERE ra.rd_from=pa.page_id" .
- " AND ra.rd_namespace=pb.page_namespace" .
- " AND ra.rd_title=pb.page_title" .
- " AND rb.rd_from=pb.page_id" .
- " AND rb.rd_namespace=pc.page_namespace" .
- " AND rb.rd_title=pc.page_title";
-
- if( $limitToTitle ) {
- $encTitle = $dbr->addQuotes( $title );
- $sql .= " AND pa.page_namespace=$namespace" .
- " AND pa.page_title=$encTitle";
+ $dbr = wfGetDB( DB_REPLICA );
+ $retval = [
+ 'tables' => [
+ 'ra' => 'redirect',
+ 'rb' => 'redirect',
+ 'pa' => 'page',
+ 'pb' => 'page'
+ ],
+ 'fields' => [
+ 'namespace' => 'pa.page_namespace',
+ 'title' => 'pa.page_title',
+ 'value' => 'pa.page_title',
+
+ 'b_namespace' => 'pb.page_namespace',
+ 'b_title' => 'pb.page_title',
+
+ // Select fields from redirect instead of page. Because there may
+ // not actually be a page table row for this target (e.g. for interwiki redirects)
+ 'c_namespace' => 'rb.rd_namespace',
+ 'c_title' => 'rb.rd_title',
+ 'c_fragment' => 'rb.rd_fragment',
+ 'c_interwiki' => 'rb.rd_interwiki',
+ ],
+ 'conds' => [
+ 'ra.rd_from = pa.page_id',
+
+ // Filter out redirects where the target goes interwiki (T42353).
+ // This isn't an optimization, it is required for correct results,
+ // otherwise a non-double redirect like Bar -> w:Foo will show up
+ // like "Bar -> Foo -> w:Foo".
+
+ // Need to check both NULL and "" for some reason,
+ // apparently either can be stored for non-iw entries.
+ 'ra.rd_interwiki IS NULL OR ra.rd_interwiki = ' . $dbr->addQuotes( '' ),
+
+ 'pb.page_namespace = ra.rd_namespace',
+ 'pb.page_title = ra.rd_title',
+
+ 'rb.rd_from = pb.page_id',
+ ]
+ ];
+
+ if ( $limitToTitle ) {
+ $retval['conds']['pa.page_namespace'] = $namespace;
+ $retval['conds']['pa.page_title'] = $title;
}
- return $sql;
+ return $retval;
}
- function getSQL() {
- $dbr = wfGetDB( DB_SLAVE );
- return $this->getSQLText( $dbr );
+ public function getQueryInfo() {
+ return $this->reallyGetQueryInfo();
}
- function getOrder() {
- return '';
+ function getOrderFields() {
+ return [ 'ra.rd_namespace', 'ra.rd_title' ];
}
+ /**
+ * @param Skin $skin
+ * @param object $result Result row
+ * @return string
+ */
function formatResult( $skin, $result ) {
- global $wgContLang;
+ // If no Title B or C is in the query, it means this came from
+ // querycache (which only saves the 3 columns for title A).
+ // That does save the bulk of the query cost, but now we need to
+ // get a little more detail about each individual entry quickly
+ // using the filter of reallyGetQueryInfo.
+ $deep = false;
+ if ( $result ) {
+ if ( isset( $result->b_namespace ) ) {
+ $deep = $result;
+ } else {
+ $dbr = wfGetDB( DB_REPLICA );
+ $qi = $this->reallyGetQueryInfo(
+ $result->namespace,
+ $result->title
+ );
+ $res = $dbr->select(
+ $qi['tables'],
+ $qi['fields'],
+ $qi['conds'],
+ __METHOD__
+ );
+
+ if ( $res ) {
+ $deep = $dbr->fetchObject( $res ) ?: false;
+ }
+ }
+ }
- $fname = 'DoubleRedirectsPage::formatResult';
$titleA = Title::makeTitle( $result->namespace, $result->title );
- if ( $result && !isset( $result->nsb ) ) {
- $dbr = wfGetDB( DB_SLAVE );
- $sql = $this->getSQLText( $dbr, $result->namespace, $result->title );
- $res = $dbr->query( $sql, $fname );
- if ( $res ) {
- $result = $dbr->fetchObject( $res );
- }
- }
- if ( !$result ) {
- return '<del>' . $skin->link( $titleA, null, array(), array( 'redirect' => 'no' ) ) . '</del>';
+ $linkRenderer = $this->getLinkRenderer();
+ if ( !$deep ) {
+ return '<del>' . $linkRenderer->makeLink( $titleA, null, [], [ 'redirect' => 'no' ] ) . '</del>';
}
- $titleB = Title::makeTitle( $result->nsb, $result->tb );
- $titleC = Title::makeTitle( $result->nsc, $result->tc );
+ // if the page is editable, add an edit link
+ if (
+ // check user permissions
+ $this->getUser()->isAllowed( 'edit' ) &&
+ // check, if the content model is editable through action=edit
+ ContentHandler::getForTitle( $titleA )->supportsDirectEditing()
+ ) {
+ $edit = $linkRenderer->makeKnownLink(
+ $titleA,
+ $this->msg( 'parentheses', $this->msg( 'editlink' )->text() )->text(),
+ [],
+ [ 'action' => 'edit' ]
+ );
+ } else {
+ $edit = '';
+ }
- $linkA = $skin->linkKnown(
+ $linkA = $linkRenderer->makeKnownLink(
$titleA,
null,
- array(),
- array( 'redirect' => 'no' )
+ [],
+ [ 'redirect' => 'no' ]
);
- $edit = $skin->linkKnown(
- $titleA,
- wfMsgExt( 'parentheses', array( 'escape' ), wfMsg( 'editlink' ) ),
- array(),
- array(
- 'redirect' => 'no',
- 'action' => 'edit'
- )
- );
- $linkB = $skin->linkKnown(
+
+ $titleB = Title::makeTitle( $deep->b_namespace, $deep->b_title );
+ $linkB = $linkRenderer->makeKnownLink(
$titleB,
null,
- array(),
- array( 'redirect' => 'no' )
+ [],
+ [ 'redirect' => 'no' ]
);
- $linkC = $skin->linkKnown( $titleC );
- $arr = $wgContLang->getArrow() . $wgContLang->getDirMark();
- return( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
+ $titleC = Title::makeTitle(
+ $deep->c_namespace,
+ $deep->c_title,
+ $deep->c_fragment,
+ $deep->c_interwiki
+ );
+ $linkC = $linkRenderer->makeKnownLink( $titleC, $titleC->getFullText() );
+
+ $lang = $this->getLanguage();
+ $arr = $lang->getArrow() . $lang->getDirMark();
+
+ return ( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
}
-}
-/**
- * constructor
- */
-function wfSpecialDoubleRedirects() {
- list( $limit, $offset ) = wfCheckLimits();
+ /**
+ * Cache page content model and gender distinction for performance
+ *
+ * @param IDatabase $db
+ * @param ResultWrapper $res
+ */
+ function preprocessResults( $db, $res ) {
+ if ( !$res->numRows() ) {
+ return;
+ }
- $sdr = new DoubleRedirectsPage();
+ $batch = new LinkBatch;
+ foreach ( $res as $row ) {
+ $batch->add( $row->namespace, $row->title );
+ if ( isset( $row->b_namespace ) ) {
+ // lazy loaded when using cached results
+ $batch->add( $row->b_namespace, $row->b_title );
+ }
+ if ( isset( $row->c_interwiki ) && !$row->c_interwiki ) {
+ // lazy loaded when using cached result, not added when interwiki link
+ $batch->add( $row->c_namespace, $row->c_title );
+ }
+ }
+ $batch->execute();
- return $sdr->doQuery( $offset, $limit );
+ // Back to start for display
+ $res->seek( 0 );
+ }
+ protected function getGroupName() {
+ return 'maintenance';
+ }
}
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