uppercaseTitlesForUnicodeTransition.php

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<?php
use MediaWiki\Maintenance\Maintenance;
use MediaWiki\Title\Title;
use MediaWiki\User\User;
use MediaWiki\WikiMap\WikiMap;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\IReadableDatabase;
use Wikimedia\Rdbms\LikeValue;
 
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
 
class UppercaseTitlesForUnicodeTransition extends Maintenance {
 
    private const MOVE = 0;
    private const INPLACE_MOVE = 1;
    private const UPPERCASE = 2;
 
    private $run = false;
 
    private $charmap = [];
 
    private $user;
 
    private $reason = 'Uppercasing title for Unicode upgrade';
 
    private $tags = [];
 
    private $seenUsers = [];
 
    private $namespaces = null;
 
    private ?string $prefix = null;
    private ?string $suffix = null;
 
    private $prefixNs = null;
 
    private $tables = null;
 
    public function __construct() {
        parent::__construct();
        $this->addDescription(
            "Rename titles when changing behavior of Language::ucfirst().\n"
            . "\n"
            . "This script skips User and User_talk pages for registered users, as renaming of users "
            . "is too complex to try to implement here. Use something like Extension:Renameuser to "
            . "clean those up; this script can provide a list of user names affected."
        );
        $this->addOption(
            'charmap', 'Character map generated by maintenance/language/generateUcfirstOverrides.php',
            true, true
        );
        $this->addOption(
            'user', 'System user to use to do the renames. Default is "Maintenance script".', false, true
        );
        $this->addOption(
            'steal',
            'If the username specified by --user exists, specify this to force conversion to a system user.'
        );
        $this->addOption(
            'run', 'If not specified, the script will not actually perform any moves (i.e. it will dry-run).'
        );
        $this->addOption(
            'prefix', 'When the new title already exists, add this prefix.', false, true
        );
        $this->addOption(
            'suffix', 'When the new title already exists, add this suffix.', false, true
        );
        $this->addOption( 'reason', 'Reason to use when moving pages.', false, true );
        $this->addOption( 'tag', 'Change tag to apply when moving pages.', false, true );
        $this->addOption( 'tables', 'Comma-separated list of database tables to process.', false, true );
        $this->addOption(
            'userlist', 'Filename to which to output usernames needing rename. ' .
            'This file can then be used directly by renameInvalidUsernames.php maintenance script',
            false,
            true
        );
        $this->setBatchSize( 1000 );
    }
 
    public function execute() {
        $this->run = $this->getOption( 'run', false );
 
        if ( $this->run ) {
            $username = $this->getOption( 'user', User::MAINTENANCE_SCRIPT_USER );
            $steal = $this->getOption( 'steal', false );
            $this->user = User::newSystemUser( $username, [ 'steal' => $steal ] );
            if ( !$this->user ) {
                $user = User::newFromName( $username );
                if ( !$steal && $user && $user->isRegistered() ) {
                    $this->fatalError( "User $username already exists.\n"
                        . "Use --steal if you really want to steal it from the human who currently owns it."
                    );
                }
                $this->fatalError( "Could not obtain system user $username." );
            }
        }
 
        $tables = $this->getOption( 'tables' );
        if ( $tables !== null ) {
            $this->tables = explode( ',', $tables );
        }
 
        $prefix = $this->getOption( 'prefix' );
        if ( $prefix !== null ) {
            $title = Title::newFromText( $prefix . 'X' );
            if ( !$title || substr( $title->getDBkey(), -1 ) !== 'X' ) {
                $this->fatalError( 'Invalid --prefix.' );
            }
            if ( $title->getNamespace() <= NS_MAIN || $title->isExternal() ) {
                $this->fatalError( 'Invalid --prefix. It must not be in namespace 0 and must not be external' );
            }
            $this->prefixNs = $title->getNamespace();
            $this->prefix = substr( $title->getText(), 0, -1 );
        }
        $this->suffix = $this->getOption( 'suffix' );
 
        $this->reason = $this->getOption( 'reason' ) ?: $this->reason;
        $this->tags = (array)$this->getOption( 'tag', null );
 
        $charmapFile = $this->getOption( 'charmap' );
        if ( !file_exists( $charmapFile ) ) {
            $this->fatalError( "Charmap file $charmapFile does not exist." );
        }
        if ( !is_file( $charmapFile ) || !is_readable( $charmapFile ) ) {
            $this->fatalError( "Charmap file $charmapFile is not readable." );
        }
        $this->charmap = require $charmapFile;
        if ( !is_array( $this->charmap ) ) {
            $this->fatalError( "Charmap file $charmapFile did not return a PHP array." );
        }
        $this->charmap = array_filter(
            $this->charmap,
            function ( $v, $k ) {
                if ( mb_strlen( $k ) !== 1 ) {
                    $this->error( "Ignoring mapping from multi-character key '$k' to '$v'" );
                    return false;
                }
                return $k !== $v;
            },
            ARRAY_FILTER_USE_BOTH
        );
        if ( !$this->charmap ) {
            $this->fatalError( "Charmap file $charmapFile did not contain any usable character mappings." );
        }
 
        $db = $this->run ? $this->getPrimaryDB() : $this->getReplicaDB();
 
        // Process inplace moves first, before actual moves, so mungeTitle() doesn't get confused
        $this->processTable(
            $db, self::INPLACE_MOVE, 'archive', 'ar_namespace', 'ar_title', [ 'ar_timestamp', 'ar_id' ]
        );
        $this->processTable(
            $db, self::INPLACE_MOVE, 'filearchive', NS_FILE, 'fa_name', [ 'fa_timestamp', 'fa_id' ]
        );
        $this->processTable(
            $db, self::INPLACE_MOVE, 'logging', 'log_namespace', 'log_title', [ 'log_id' ]
        );
        $this->processTable(
            $db, self::INPLACE_MOVE, 'protected_titles', 'pt_namespace', 'pt_title', []
        );
        $this->processTable( $db, self::MOVE, 'page', 'page_namespace', 'page_title', [ 'page_id' ] );
        $this->processTable( $db, self::MOVE, 'image', NS_FILE, 'img_name', [] );
        $this->processTable(
            $db, self::UPPERCASE, 'redirect', 'rd_namespace', 'rd_title', [ 'rd_from' ]
        );
        $this->processUsers( $db );
    }
 
    private function getLikeBatches( IReadableDatabase $db, $field, $batchSize = 100 ) {
        $ret = [];
        $likes = [];
        foreach ( $this->charmap as $from => $to ) {
            $likes[] = $db->expr(
                $field,
                IExpression::LIKE,
                new LikeValue( $from, $db->anyString() )
            );
            if ( count( $likes ) >= $batchSize ) {
                $ret[] = $db->orExpr( $likes );
                $likes = [];
            }
        }
        if ( $likes ) {
            $ret[] = $db->orExpr( $likes );
        }
        return $ret;
    }
 
    private function getNamespaces() {
        if ( $this->namespaces === null ) {
            $nsinfo = $this->getServiceContainer()->getNamespaceInfo();
            $this->namespaces = array_filter(
                array_keys( $nsinfo->getCanonicalNamespaces() ),
                static function ( $ns ) use ( $nsinfo ) {
                    return $nsinfo->isMovable( $ns ) && $nsinfo->isCapitalized( $ns );
                }
            );
            usort( $this->namespaces, static function ( $ns1, $ns2 ) use ( $nsinfo ) {
                if ( $ns1 === $ns2 ) {
                    return 0;
                }
 
                $s1 = $nsinfo->getSubject( $ns1 );
                $s2 = $nsinfo->getSubject( $ns2 );
 
                // Order by subject namespace number first
                if ( $s1 !== $s2 ) {
                    return $s1 < $s2 ? -1 : 1;
                }
 
                // Second, put subject namespaces before non-subject namespaces
                if ( $s1 === $ns1 ) {
                    return -1;
                }
                if ( $s2 === $ns2 ) {
                    return 1;
                }
 
                // Don't care about the relative order if there are somehow
                // multiple non-subject namespaces for a namespace.
                return 0;
            } );
        }
 
        return $this->namespaces;
    }
 
    private function isUserPage( IReadableDatabase $db, $ns, $title ) {
        if ( $ns !== NS_USER && $ns !== NS_USER_TALK ) {
            return false;
        }
 
        [ $base ] = explode( '/', $title, 2 );
        if ( !isset( $this->seenUsers[$base] ) ) {
            // Can't use User directly because it might uppercase the name
            $this->seenUsers[$base] = (bool)$db->newSelectQueryBuilder()
                ->select( 'user_id' )
                ->from( 'user' )
                ->where( [ 'user_name' => strtr( $base, '_', ' ' ) ] )
                ->caller( __METHOD__ )->fetchField();
        }
        return $this->seenUsers[$base];
    }
 
    private function mungeTitle( IReadableDatabase $db, Title $oldTitle, Title &$newTitle ) {
        $nt = $newTitle->getPrefixedText();
 
        $munge = false;
        if ( $this->isUserPage( $db, $newTitle->getNamespace(), $newTitle->getText() ) ) {
            $munge = 'Target title\'s user exists';
        } else {
            $mpFactory = $this->getServiceContainer()->getMovePageFactory();
            $status = $mpFactory->newMovePage( $oldTitle, $newTitle )->isValidMove();
            if ( !$status->isOK() && (
                $status->hasMessage( 'articleexists' ) || $status->hasMessage( 'redirectexists' ) ) ) {
                $munge = 'Target title exists';
            }
        }
        if ( !$munge ) {
            return true;
        }
 
        if ( $this->prefix !== null ) {
            $newTitle = Title::makeTitle(
                $this->prefixNs,
                $this->prefix . $oldTitle->getPrefixedText() . ( $this->suffix ?? '' )
            );
        } elseif ( $this->suffix !== null ) {
            $dbkey = $newTitle->getText();
            $i = $newTitle->getNamespace() === NS_FILE ? strrpos( $dbkey, '.' ) : false;
            if ( $i !== false ) {
                $newTitle = Title::makeTitle(
                    $newTitle->getNamespace(),
                    substr( $dbkey, 0, $i ) . $this->suffix . substr( $dbkey, $i )
                );
            } else {
                $newTitle = Title::makeTitle( $newTitle->getNamespace(), $dbkey . $this->suffix );
            }
        } else {
            $this->error(
                "Cannot move {$oldTitle->getPrefixedText()} → $nt: "
                . "$munge and no --prefix or --suffix was given"
            );
            return false;
        }
 
        if ( !$newTitle->canExist() ) {
            $this->error(
                "Cannot move {$oldTitle->getPrefixedText()} → $nt: "
                . "$munge and munged title '{$newTitle->getPrefixedText()}' is not valid"
            );
            return false;
        }
        if ( $newTitle->exists() ) {
            $this->error(
                "Cannot move {$oldTitle->getPrefixedText()} → $nt: "
                . "$munge and munged title '{$newTitle->getPrefixedText()}' also exists"
            );
            return false;
        }
 
        return true;
    }
 
    private function doMove( IDatabase $db, $ns, $title ) {
        $char = mb_substr( $title, 0, 1 );
        if ( !array_key_exists( $char, $this->charmap ) ) {
            $this->error(
                "Query returned NS$ns $title, which does not begin with a character in the charmap."
            );
            return false;
        }
 
        if ( $this->isUserPage( $db, $ns, $title ) ) {
            $this->output( "... Skipping user page NS$ns $title\n" );
            return null;
        }
 
        $oldTitle = Title::makeTitle( $ns, $title );
        $newTitle = Title::makeTitle( $ns, $this->charmap[$char] . mb_substr( $title, 1 ) );
        $deletionReason = $this->shouldDelete( $db, $oldTitle, $newTitle );
        if ( !$this->mungeTitle( $db, $oldTitle, $newTitle ) ) {
            return false;
        }
 
        $services = $this->getServiceContainer();
        $mpFactory = $services->getMovePageFactory();
        $movePage = $mpFactory->newMovePage( $oldTitle, $newTitle );
        $status = $movePage->isValidMove();
        if ( !$status->isOK() ) {
            $this->error( "Invalid move {$oldTitle->getPrefixedText()} → {$newTitle->getPrefixedText()}:" );
            $this->error( $status );
            return false;
        }
 
        if ( !$this->run ) {
            $this->output(
                "Would rename {$oldTitle->getPrefixedText()} → {$newTitle->getPrefixedText()}\n"
            );
            if ( $deletionReason ) {
                $this->output(
                    "Would then delete {$newTitle->getPrefixedText()}: $deletionReason\n"
                );
            }
            return true;
        }
 
        $status = $movePage->move( $this->user, $this->reason, false, $this->tags );
        if ( !$status->isOK() ) {
            $this->error( "Move {$oldTitle->getPrefixedText()} → {$newTitle->getPrefixedText()} failed:" );
            $this->error( $status );
        }
        $this->output( "Renamed {$oldTitle->getPrefixedText()} → {$newTitle->getPrefixedText()}\n" );
 
        // The move created a log entry under the old invalid title. Fix it.
        $db->newUpdateQueryBuilder()
            ->update( 'logging' )
            ->set( [
                'log_title' => $this->charmap[$char] . mb_substr( $title, 1 ),
            ] )
            ->where( [
                'log_namespace' => $oldTitle->getNamespace(),
                'log_title' => $oldTitle->getDBkey(),
                'log_page' => $newTitle->getArticleID(),
            ] )
            ->caller( __METHOD__ )
            ->execute();
 
        if ( $deletionReason !== null ) {
            $page = $services->getWikiPageFactory()->newFromTitle( $newTitle );
            $delPage = $services->getDeletePageFactory()->newDeletePage( $page, $this->user );
            $status = $delPage
                ->forceImmediate( true )
                ->deleteUnsafe( $deletionReason );
            if ( !$status->isOK() ) {
                $this->error( "Deletion of {$newTitle->getPrefixedText()} failed:" );
                $this->error( $status );
                return false;
            }
            $this->output( "Deleted {$newTitle->getPrefixedText()}\n" );
        }
 
        return true;
    }
 
    private function shouldDelete( IReadableDatabase $db, Title $oldTitle, Title $newTitle ) {
        $oldRow = $db->newSelectQueryBuilder()
            ->select( [ 'ns' => 'rd_namespace', 'title' => 'rd_title' ] )
            ->from( 'page' )
            ->join( 'redirect', null, 'rd_from = page_id' )
            ->where( [ 'page_namespace' => $oldTitle->getNamespace(), 'page_title' => $oldTitle->getDBkey() ] )
            ->caller( __METHOD__ )->fetchRow();
        if ( !$oldRow ) {
            // Not a redirect
            return null;
        }
 
        if ( (int)$oldRow->ns === $newTitle->getNamespace() &&
            $oldRow->title === $newTitle->getDBkey()
        ) {
            return $this->reason . ", and found that [[{$oldTitle->getPrefixedText()}]] is "
                . "already a redirect to [[{$newTitle->getPrefixedText()}]]";
        } else {
            $newRow = $db->newSelectQueryBuilder()
                ->select( [ 'ns' => 'rd_namespace', 'title' => 'rd_title' ] )
                ->from( 'page' )
                ->join( 'redirect', null, 'rd_from = page_id' )
                ->where( [ 'page_namespace' => $newTitle->getNamespace(), 'page_title' => $newTitle->getDBkey() ] )
                ->caller( __METHOD__ )->fetchRow();
            if ( $newRow && $oldRow->ns === $newRow->ns && $oldRow->title === $newRow->title ) {
                $nt = Title::makeTitle( $newRow->ns, $newRow->title );
                return $this->reason . ", and found that [[{$oldTitle->getPrefixedText()}]] and "
                    . "[[{$newTitle->getPrefixedText()}]] both redirect to [[{$nt->getPrefixedText()}]].";
            }
        }
 
        return null;
    }
 
    private function doUpdate( IDatabase $db, $op, $table, $nsField, $titleField, $row ) {
        $ns = is_int( $nsField ) ? $nsField : (int)$row->$nsField;
        $title = $row->$titleField;
 
        $char = mb_substr( $title, 0, 1 );
        if ( !array_key_exists( $char, $this->charmap ) ) {
            $r = json_encode( $row, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );
            $this->error(
                "Query returned $r, but title does not begin with a character in the charmap."
            );
            return false;
        }
 
        $oldTitle = Title::makeTitle( $ns, $title );
        $newTitle = Title::makeTitle( $ns, $this->charmap[$char] . mb_substr( $title, 1 ) );
        if ( $op !== self::UPPERCASE && !$this->mungeTitle( $db, $oldTitle, $newTitle ) ) {
            return false;
        }
 
        if ( $this->run ) {
            $db->newUpdateQueryBuilder()
                ->update( $table )
                ->set( array_merge(
                    is_int( $nsField ) ? [] : [ $nsField => $newTitle->getNamespace() ],
                    [ $titleField => $newTitle->getDBkey() ]
                ) )
                ->where( (array)$row )
                ->caller( __METHOD__ )
                ->execute();
            $r = json_encode( $row, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );
            $this->output( "Set $r to {$newTitle->getPrefixedText()}\n" );
        } else {
            $r = json_encode( $row, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );
            $this->output( "Would set $r to {$newTitle->getPrefixedText()}\n" );
        }
 
        return true;
    }
 
    private function processTable( IDatabase $db, $op, $table, $nsField, $titleField, $pkFields ) {
        if ( $this->tables !== null && !in_array( $table, $this->tables, true ) ) {
            $this->output( "Skipping table `$table`, not in --tables.\n" );
            return;
        }
 
        $batchSize = $this->getBatchSize();
        $namespaces = $this->getNamespaces();
        $likes = $this->getLikeBatches( $db, $titleField );
 
        if ( is_int( $nsField ) ) {
            $namespaces = array_intersect( $namespaces, [ $nsField ] );
        }
 
        if ( !$namespaces ) {
            $this->output( "Skipping table `$table`, no valid namespaces.\n" );
            return;
        }
 
        $this->output( "Processing table `$table`...\n" );
 
        $selectFields = array_merge(
            is_int( $nsField ) ? [] : [ $nsField ],
            [ $titleField ],
            $pkFields
        );
        $contFields = array_merge( [ $titleField ], $pkFields );
 
        $lastReplicationWait = 0.0;
        $count = 0;
        $errors = 0;
        foreach ( $namespaces as $ns ) {
            foreach ( $likes as $like ) {
                $cont = [];
                do {
                    $res = $db->newSelectQueryBuilder()
                        ->select( $selectFields )
                        ->from( $table )
                        ->where( [ "$nsField = $ns", $like, $cont ? $db->buildComparison( '>', $cont ) : '1=1' ] )
                        ->orderBy( array_merge( [ $titleField ], $pkFields ) )
                        ->limit( $batchSize )
                        ->caller( __METHOD__ )->fetchResultSet();
                    $cont = [];
 
                    $this->beginTransactionRound( __METHOD__ );
                    foreach ( $res as $row ) {
                        $cont = [];
                        foreach ( $contFields as $field ) {
                            $cont[ $field ] = $row->$field;
                        }
 
                        if ( $op === self::MOVE ) {
                            $ns = is_int( $nsField ) ? $nsField : (int)$row->$nsField;
                            $ret = $this->doMove( $db, $ns, $row->$titleField );
                        } else {
                            $ret = $this->doUpdate( $db, $op, $table, $nsField, $titleField, $row );
                        }
                        if ( $ret === true ) {
                            $count++;
                        } elseif ( $ret === false ) {
                            $errors++;
                        }
                    }
                    $this->commitTransactionRound( __METHOD__ );
 
                    if ( $this->run ) {
                        // @phan-suppress-next-line PhanPossiblyUndeclaredVariable rows contains at least one item
                        $r = $cont ? json_encode( $row, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE ) : '<end>';
                        $this->output( "... $table: $count renames, $errors errors at $r\n" );
                    }
                } while ( $cont );
            }
        }
 
        $this->output( "Done processing table `$table`.\n" );
    }
 
    private function processUsers( IReadableDatabase $db ) {
        $userlistFile = $this->getOption( 'userlist' );
        if ( $userlistFile === null ) {
            $this->output( "Not generating user list, --userlist was not specified.\n" );
            return;
        }
 
        $fh = fopen( $userlistFile, 'ab' );
        if ( !$fh ) {
            $this->error( "Could not open user list file $userlistFile" );
            return;
        }
 
        $this->output( "Generating user list...\n" );
        $count = 0;
        $batchSize = $this->getBatchSize();
        foreach ( $this->getLikeBatches( $db, 'user_name' ) as $like ) {
            $cont = [];
            while ( true ) {
                $rows = $db->newSelectQueryBuilder()
                    ->select( [ 'user_id', 'user_name' ] )
                    ->from( 'user' )
                    ->where( $like )
                    ->andWhere( $cont )
                    ->orderBy( 'user_name' )
                    ->limit( $batchSize )
                    ->caller( __METHOD__ )->fetchResultSet();
 
                if ( !$rows->numRows() ) {
                    break;
                }
 
                foreach ( $rows as $row ) {
                    $char = mb_substr( $row->user_name, 0, 1 );
                    if ( !array_key_exists( $char, $this->charmap ) ) {
                        $this->error(
                            "Query returned $row->user_name, but user name does not " .
                            "begin with a character in the charmap."
                        );
                        continue;
                    }
                    $newName = $this->charmap[$char] . mb_substr( $row->user_name, 1 );
                    fprintf( $fh, "%s\t%s\t%s\n", WikiMap::getCurrentWikiId(), $row->user_id, $newName );
                    $count++;
                    $cont = [ $db->expr( 'user_name', '>', $row->user_name ) ];
                }
                // @phan-suppress-next-line PhanPossiblyUndeclaredVariable rows contains at least one item
                $this->output( "... at $row->user_name, $count names so far\n" );
            }
        }
 
        if ( !fclose( $fh ) ) {
            $this->error( "fclose on $userlistFile failed" );
        }
        $this->output( "User list output to $userlistFile, $count users need renaming.\n" );
    }
}
 
// @codeCoverageIgnoreStart
$maintClass = UppercaseTitlesForUnicodeTransition::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd