ConfigFilter.groovy

package config

import grails.util.Holders
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.HttpServletRequest
import javax.servlet.http.HttpServletResponse

class ConfigFilter extends GenericFilterBean {

    List urisToFilter

    @Override
    void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        HttpServletRequest httpServletRequest = request as HttpServletRequest
        HttpServletResponse httpServletResponse = response as HttpServletResponse

        def actualUri = httpServletRequest.requestURI - httpServletRequest.contextPath
        def token = request.getHeader("Authorization")
      
        if (urisToFilter.any { actualUri.startsWith(it)}) {
            if (token != Holders.config.get("config.token")) {
                httpServletResponse.setStatus(HttpServletResponse.SC_FORBIDDEN)
                httpServletResponse.contentType = "application/json"
                httpServletResponse.characterEncoding = "UTF-8"
                httpServletResponse.addHeader "Cache-Control", "no-store"
                httpServletResponse.addHeader "Pragma", "no-cache"
                httpServletResponse << """{"code": "403", "message": "Not Authorized"}"""
            } else {
                chain.doFilter(request, response)
            }
        } else {
            chain.doFilter(request, response)
        }
    }
}