LoginHelper.php

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<?php

class LoginHelper extends ContextSource {
    public static $validErrorMessages = [
        'exception-nologin-text',
        'watchlistanontext',
        'changeemail-no-info',
        'resetpass-no-info',
        'confirmemail_needlogin',
        'prefsnologintext2',
        'specialmute-login-required',
    ];

    public static function getValidErrorMessages() {
        static $messages = null;
        if ( !$messages ) {
            $messages = self::$validErrorMessages;
            Hooks::run( 'LoginFormValidErrorMessages', [ &$messages ] );
        }

        return $messages;
    }

    public function __construct( IContextSource $context ) {
        $this->setContext( $context );
    }

    public function showReturnToPage(
        $type, $returnTo = '', $returnToQuery = '', $stickHTTPS = false
    ) {
        $config = $this->getConfig();
        if ( $type !== 'error' && $config->get( 'RedirectOnLogin' ) !== null ) {
            $returnTo = $config->get( 'RedirectOnLogin' );
            $returnToQuery = [];
        } elseif ( is_string( $returnToQuery ) ) {
            $returnToQuery = wfCgiToArray( $returnToQuery );
        }

        // Allow modification of redirect behavior
        Hooks::run( 'PostLoginRedirect', [ &$returnTo, &$returnToQuery, &$type ] );

        $returnToTitle = Title::newFromText( $returnTo ) ?: Title::newMainPage();

        if ( $config->get( 'SecureLogin' ) && !$stickHTTPS ) {
            $options = [ 'http' ];
            $proto = PROTO_HTTP;
        } elseif ( $config->get( 'SecureLogin' ) ) {
            $options = [ 'https' ];
            $proto = PROTO_HTTPS;
        } else {
            $options = [];
            $proto = PROTO_RELATIVE;
        }

        if ( $type === 'successredirect' ) {
            $redirectUrl = $returnToTitle->getFullUrlForRedirect( $returnToQuery, $proto );
            $this->getOutput()->redirect( $redirectUrl );
        } else {
            $this->getOutput()->addReturnTo( $returnToTitle, $returnToQuery, null, $options );
        }
    }
}