Filter to add SameSite to SESSION cookies in grails/boot

SameSiteCookieFilter.groovy

package web.http

import groovy.transform.CompileStatic
import org.springframework.web.filter.GenericFilterBean

import javax.servlet.FilterChain
import javax.servlet.ServletException
import javax.servlet.ServletRequest
import javax.servlet.ServletResponse
import javax.servlet.http.Cookie
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

@CompileStatic
class SameSiteCookieFilter extends GenericFilterBean {

    protected String sameSiteValue = 'Strict'
    protected String cookieName = 'SESSION'

    void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req
        HttpServletResponse response = (HttpServletResponse) res

        request.cookies.each { Cookie ck ->
            if (cookieName == ck.name) {
                String value
                value = "${ck.name}=${ck.value}"
                value += ";domain=${ck.domain ?: "localhost"}"
                value += ";Path=${ck.path ?: "/"}"

                if(ck.httpOnly)
                    value += ";HTTPOnly"
                if(ck.secure)
                    value += ";Secure"
                if(ck.comment)
                    value  += ";Comment=${ck.comment}"
                if(ck.maxAge)
                    value  +=";Max-Age=${ck.maxAge}"
                if(sameSiteValue)
                    value += ";SameSite=${sameSiteValue}"

                response.setHeader("Set-Cookie", value)
            }
        }
        chain.doFilter(request, response);
    }
}