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<?php
/**
* Implements Special:DoubleRedirects
*
* 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
*/
use Wikimedia\Rdbms\IResultWrapper;
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 QueryPage {
function __construct( $name = 'DoubleRedirects' ) {
parent::__construct( $name );
}
public function isExpensive() {
return true;
}
function isSyndicated() {
return false;
}
function sortDescending() {
return false;
}
function getPageHeader() {
return $this->msg( 'doubleredirectstext' )->parseAsBlock();
}
function reallyGetQueryInfo( $namespace = null, $title = null ) {
$limitToTitle = !( $namespace === null && $title === null );
$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 $retval;
}
public function getQueryInfo() {
return $this->reallyGetQueryInfo();
}
function getOrderFields() {
return [ 'ra.rd_namespace', 'ra.rd_title' ];
}
/**
* @param Skin $skin
* @param object $result Result row
* @return string
*/
function formatResult( $skin, $result ) {
// 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;
}
}
}
$titleA = Title::makeTitle( $result->namespace, $result->title );
$linkRenderer = $this->getLinkRenderer();
if ( !$deep ) {
return '<del>' . $linkRenderer->makeLink( $titleA, null, [], [ 'redirect' => 'no' ] ) . '</del>';
}
// 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 = $linkRenderer->makeKnownLink(
$titleA,
null,
[],
[ 'redirect' => 'no' ]
);
$titleB = Title::makeTitle( $deep->b_namespace, $deep->b_title );
$linkB = $linkRenderer->makeKnownLink(
$titleB,
null,
[],
[ 'redirect' => 'no' ]
);
$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}" );
}
/**
* Cache page content model and gender distinction for performance
*
* @param IDatabase $db
* @param IResultWrapper $res
*/
function preprocessResults( $db, $res ) {
if ( !$res->numRows() ) {
return;
}
$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();
// Back to start for display
$res->seek( 0 );
}
protected function getGroupName() {
return 'maintenance';
}
}
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