cleanupSpam.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class CleanupSpam extends Maintenance {

    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Cleanup all spam from a given hostname' );
        $this->addOption( 'all', 'Check all wikis in $wgLocalDatabases' );
        $this->addOption( 'delete', 'Delete pages containing only spam instead of blanking them' );
        $this->addArg(
            'hostname',
            'Hostname that was spamming, single * wildcard in the beginning allowed'
        );
    }

    public function execute() {
        global $IP, $wgLocalDatabases, $wgUser;

        $username = wfMessage( 'spambot_username' )->text();
        $wgUser = User::newSystemUser( $username );
        if ( !$wgUser ) {
            $this->error( "Invalid username specified in 'spambot_username' message: $username", true );
        }
        // Create the user if necessary
        if ( !$wgUser->getId() ) {
            $wgUser->addToDatabase();
        }
        $spec = $this->getArg();
        $like = LinkFilter::makeLikeArray( $spec );
        if ( !$like ) {
            $this->error( "Not a valid hostname specification: $spec", true );
        }

        if ( $this->hasOption( 'all' ) ) {
            // Clean up spam on all wikis
            $this->output( "Finding spam on " . count( $wgLocalDatabases ) . " wikis\n" );
            $found = false;
            foreach ( $wgLocalDatabases as $wikiID ) {
                $dbr = $this->getDB( DB_REPLICA, [], $wikiID );

                $count = $dbr->selectField( 'externallinks', 'COUNT(*)',
                    [ 'el_index' . $dbr->buildLike( $like ) ], __METHOD__ );
                if ( $count ) {
                    $found = true;
                    $cmd = wfShellWikiCmd( "$IP/maintenance/cleanupSpam.php",
                        [ '--wiki', $wikiID, $spec ] );
                    passthru( "$cmd | sed 's/^/$wikiID:  /'" );
                }
            }
            if ( $found ) {
                $this->output( "All done\n" );
            } else {
                $this->output( "None found\n" );
            }
        } else {
            // Clean up spam on this wiki

            $dbr = $this->getDB( DB_REPLICA );
            $res = $dbr->select( 'externallinks', [ 'DISTINCT el_from' ],
                [ 'el_index' . $dbr->buildLike( $like ) ], __METHOD__ );
            $count = $dbr->numRows( $res );
            $this->output( "Found $count articles containing $spec\n" );
            foreach ( $res as $row ) {
                $this->cleanupArticle( $row->el_from, $spec );
            }
            if ( $count ) {
                $this->output( "Done\n" );
            }
        }
    }

    private function cleanupArticle( $id, $domain ) {
        $title = Title::newFromID( $id );
        if ( !$title ) {
            $this->error( "Internal error: no page for ID $id" );

            return;
        }

        $this->output( $title->getPrefixedDBkey() . " ..." );
        $rev = Revision::newFromTitle( $title );
        $currentRevId = $rev->getId();

        while ( $rev && ( $rev->isDeleted( Revision::DELETED_TEXT )
            || LinkFilter::matchEntry( $rev->getContent( Revision::RAW ), $domain ) )
        ) {
            $rev = $rev->getPrevious();
        }

        if ( $rev && $rev->getId() == $currentRevId ) {
            // The regex didn't match the current article text
            // This happens e.g. when a link comes from a template rather than the page itself
            $this->output( "False match\n" );
        } else {
            $dbw = $this->getDB( DB_MASTER );
            $this->beginTransaction( $dbw, __METHOD__ );
            $page = WikiPage::factory( $title );
            if ( $rev ) {
                // Revert to this revision
                $content = $rev->getContent( Revision::RAW );

                $this->output( "reverting\n" );
                $page->doEditContent(
                    $content,
                    wfMessage( 'spam_reverting', $domain )->inContentLanguage()->text(),
                    EDIT_UPDATE,
                    $rev->getId()
                );
            } elseif ( $this->hasOption( 'delete' ) ) {
                // Didn't find a non-spammy revision, blank the page
                $this->output( "deleting\n" );
                $page->doDeleteArticle(
                    wfMessage( 'spam_deleting', $domain )->inContentLanguage()->text()
                );
            } else {
                // Didn't find a non-spammy revision, blank the page
                $handler = ContentHandler::getForTitle( $title );
                $content = $handler->makeEmptyContent();

                $this->output( "blanking\n" );
                $page->doEditContent(
                    $content,
                    wfMessage( 'spam_blanking', $domain )->inContentLanguage()->text()
                );
            }
            $this->commitTransaction( $dbw, __METHOD__ );
        }
    }
}

$maintClass = "CleanupSpam";
require_once RUN_MAINTENANCE_IF_MAIN;