cleanupTitles.php

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<?php
use MediaWiki\MainConfigNames;
use MediaWiki\Title\Title;
use Wikimedia\Rdbms\IDBAccessObject;
 
// @codeCoverageIgnoreStart
require_once __DIR__ . '/TableCleanup.php';
// @codeCoverageIgnoreEnd
 
class TitleCleanup extends TableCleanup {
 
    private string $prefix;
 
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Script to clean up broken, unparseable titles' );
        $this->addOption( 'prefix', "Broken pages will be renamed to titles with  " .
            "<prefix> prepended before the article name. Defaults to 'Broken'", false, true );
        $this->setBatchSize( 1000 );
    }
 
    public function execute() {
        $this->prefix = $this->getOption( 'prefix', 'Broken' ) . "/";
        // Make sure the prefix itself is a valid title now
        // rather than spewing errors for every page being cleaned up
        // if it's not (We assume below that concatenating the prefix to a title leaves it in NS0)
        // The trailing slash above ensures that concatenating the title to something
        // can't turn it into a namespace or interwiki
        $title = Title::newFromText( $this->prefix );
        if ( !$title || !$title->canExist() || $title->getInterwiki() || $title->getNamespace() !== 0 ) {
            $this->fatalError( "Invalid prefix {$this->prefix}. Must be a valid mainspace title." );
        }
        parent::execute();
    }
 
    protected function processRow( $row ) {
        $display = Title::makeName( $row->page_namespace, $row->page_title );
        $verified = $this->getServiceContainer()->getContentLanguage()->normalize( $display );
        $title = Title::newFromText( $verified );
 
        if ( $title !== null
            && $title->canExist()
            && $title->getNamespace() == $row->page_namespace
            && $title->getDBkey() === $row->page_title
        ) {
            // all is fine
            $this->progress( 0 );
 
            return;
        }
 
        if ( $row->page_namespace == NS_FILE && $this->fileExists( $row->page_title ) ) {
            $this->output( "file $row->page_title needs cleanup, please run cleanupImages.php.\n" );
            $this->progress( 0 );
        } elseif ( $title === null ) {
            $this->output( "page $row->page_id ($display) is illegal.\n" );
            $this->moveIllegalPage( $row );
            $this->progress( 1 );
        } else {
            $this->output( "page $row->page_id ($display) doesn't match self.\n" );
            $this->moveInconsistentPage( $row, $title );
            $this->progress( 1 );
        }
    }
 
    protected function fileExists( $name ) {
        // XXX: Doesn't actually check for file existence, just presence of image/file record.
        // This is reasonable, since cleanupImages.php only iterates over the image/file table.
        $dbr = $this->getReplicaDB();
        $migrationStage = $this->getServiceContainer()->getMainConfig()->get(
            MainConfigNames::FileSchemaMigrationStage
        );
        if ( $migrationStage & SCHEMA_COMPAT_READ_OLD ) {
            $row = $dbr->newSelectQueryBuilder()
                ->select( '*' )
                ->from( 'image' )
                ->where( [ 'img_name' => $name ] )
                ->caller( __METHOD__ )
                ->fetchRow();
        } else {
            $row = $dbr->newSelectQueryBuilder()
                ->select( '*' )
                ->from( 'file' )
                ->where( [
                    'file_name' => $name,
                    'file_deleted' => 0,
                ] )
                ->caller( __METHOD__ )
                ->fetchRow();
        }
 
        return $row !== false;
    }
 
    protected function moveIllegalPage( $row ) {
        $legalChars = Title::legalChars();
        $legalizedUnprefixed = preg_replace_callback( "/([^$legalChars])/",
            $this->hexChar( ... ),
            $row->page_title );
        if ( $legalizedUnprefixed == '.' ) {
            $legalizedUnprefixed = '(dot)';
        }
        if ( $legalizedUnprefixed == '_' ) {
            $legalizedUnprefixed = '(space)';
        }
        $ns = (int)$row->page_namespace;
 
        $title = null;
        // Try to move "Talk:Project:Foo" -> "Project talk:Foo"
        if ( $ns === 1 ) {
            $subjectTitle = Title::newFromText( $legalizedUnprefixed );
            if ( $subjectTitle && !$subjectTitle->isTalkPage() ) {
                $talkTitle = $subjectTitle->getTalkPageIfDefined();
                if ( $talkTitle !== null && !$talkTitle->exists() ) {
                    $ns = $talkTitle->getNamespace();
                    $title = $talkTitle;
                }
            }
        }
 
        if ( $title === null ) {
            // Not a talk page or that didn't work
            // move any other broken pages to the main namespace so they can be found together
            if ( $ns !== 0 ) {
                $namespaceInfo = $this->getServiceContainer()->getNamespaceInfo();
                $namespaceName = $namespaceInfo->getCanonicalName( $ns );
                if ( $namespaceName === false ) {
                    $namespaceName = "NS$ns"; // Fallback for unknown namespaces
                }
                $ns = 0;
                $legalizedUnprefixed = "$namespaceName:$legalizedUnprefixed";
            }
            $title = Title::newFromText( $this->prefix . $legalizedUnprefixed );
        }
 
        if ( $title === null ) {
            // It's still not a valid title, try again with a much smaller
            // allowed character set. This will mangle any titles with non-ASCII
            // characters, but if we don't do this the result will be
            // falling back to the Broken/id:foo failsafe below which is worse
            $legalizedUnprefixed = preg_replace_callback( '!([^A-Za-z0-9_:\\-])!',
                $this->hexChar( ... ),
                $legalizedUnprefixed
            );
            $title = Title::newFromText( $this->prefix . $legalizedUnprefixed );
        }
 
        if ( $title === null ) {
            // Oh well, we tried
            $clean = $this->prefix . 'id:' . $row->page_id;
            $legalized = $this->prefix . $legalizedUnprefixed;
            $this->output( "Couldn't legalize; form '$legalized' still invalid; using '$clean'\n" );
            $title = Title::newFromText( $clean );
        } elseif ( $title->exists( IDBAccessObject::READ_LATEST ) ) {
            $clean = $this->prefix . 'id:' . $row->page_id;
            $conflict = $title->getDBKey();
            $this->output( "Legalized for '$conflict' exists; using '$clean'\n" );
            $title = Title::newFromText( $clean );
        }
 
        if ( !$title || $title->exists( IDBAccessObject::READ_LATEST ) ) {
            // This can happen in corner cases like if numbers are made not valid
            // title characters using the (deprecated) $wgLegalTitleChars or
            // a 'Broken/id:foo' title already exists
            $this->error( "Destination page {$title->getText()} is invalid or already exists, skipping." );
            return;
        }
 
        $dest = $title->getDBkey();
        if ( $this->dryrun ) {
            $this->output( "DRY RUN: would rename $row->page_id ($row->page_namespace," .
                "'$row->page_title') to ($ns,'$dest')\n" );
        } else {
            $this->output( "renaming $row->page_id ($row->page_namespace," .
                "'$row->page_title') to ($ns,'$dest')\n" );
            $this->getPrimaryDB()
                ->newUpdateQueryBuilder()
                ->update( 'page' )
                ->set( [ 'page_title' => $dest, 'page_namespace' => $ns ] )
                ->where( [ 'page_id' => $row->page_id ] )
                ->caller( __METHOD__ )->execute();
        }
    }
 
    protected function moveInconsistentPage( $row, Title $title ) {
        $titleImpossible = $title->getInterwiki() || !$title->canExist();
        if ( $title->exists( IDBAccessObject::READ_LATEST ) || $titleImpossible ) {
            if ( $titleImpossible ) {
                $prior = $title->getPrefixedDBkey();
            } else {
                $prior = $title->getDBkey();
            }
 
            $ns = (int)$row->page_namespace;
            # If a page is saved in the main namespace with a namespace prefix then try to move it into
            # that namespace. If there's no conflict then it will succeed. Otherwise it will hit the condition
            # } else if ($ns !== 0) { and be moved to Broken/Namespace:Title
            # whereas without this check it would just go to Broken/Title
            if ( $ns === 0 ) {
                $ns = $title->getNamespace();
            }
 
            # Old cleanupTitles could move articles there. See T25147.
            # or a page could be stored as (0, "Special:Foo") in which case the $titleImpossible
            # condition would be true and we've already added a prefix so pretend we're in mainspace
            # and don't add another
            if ( $ns < 0 ) {
                $ns = 0;
            }
 
            # Namespace which no longer exists. Put the page in the main namespace
            # since we don't have any idea of the old namespace name. See T70501.
            # We build the new title ourself rather than relying on getDBKey() because
            # that will return Special:BadTitle
            $namespaceInfo = $this->getServiceContainer()->getNamespaceInfo();
            if ( !$namespaceInfo->exists( $ns ) ) {
                $clean = "{$this->prefix}NS$ns:$row->page_title";
                $ns = 0;
            } elseif ( !$titleImpossible && !$title->exists( IDBAccessObject::READ_LATEST ) ) {
                // Looks like the current title, after cleaning it up, is valid and available
                $clean = $prior;
            } elseif ( $ns !== 0 ) {
                // Put all broken pages in the main namespace so that they can be found via Special:PrefixIndex
                $nsName = $namespaceInfo->getCanonicalName( $ns );
                $clean = "{$this->prefix}$nsName:{$prior}";
                $ns = 0;
            } else {
                $clean = $this->prefix . $prior;
            }
            $verified = Title::makeTitleSafe( $ns, $clean );
            if ( !$verified || $verified->exists( IDBAccessObject::READ_LATEST ) ) {
                $lastResort = "{$this->prefix}id: {$row->page_id}";
                $this->output( "Couldn't legalize; form '$clean' exists; using '$lastResort'\n" );
                $verified = Title::makeTitleSafe( $ns, $lastResort );
                if ( !$verified || $verified->exists( IDBAccessObject::READ_LATEST ) ) {
                    // This can happen in corner cases like if numbers are made not valid
                    // title characters using the (deprecated) $wgLegalTitleChars or
                    // a 'Broken/id:foo' title already exists
                    $this->error( "Destination page $lastResort invalid or already exists." );
                    return;
                }
            }
            $title = $verified;
        }
 
        $ns = $title->getNamespace();
        $dest = $title->getDBkey();
 
        if ( $this->dryrun ) {
            $this->output( "DRY RUN: would rename $row->page_id ($row->page_namespace," .
                "'$row->page_title') to ($ns,'$dest')\n" );
        } else {
            $this->output( "renaming $row->page_id ($row->page_namespace," .
                "'$row->page_title') to ($ns,'$dest')\n" );
            $this->getPrimaryDB()
                ->newUpdateQueryBuilder()
                ->update( 'page' )
                ->set( [
                    'page_namespace' => $ns,
                    'page_title' => $dest
                ] )
                ->where( [ 'page_id' => $row->page_id ] )
                ->caller( __METHOD__ )->execute();
            $this->getServiceContainer()->getLinkCache()->clear();
        }
    }
}
 
// @codeCoverageIgnoreStart
$maintClass = TitleCleanup::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd