Check Authentication in CQ

AuthCheckerServlet.java

import org.apache.felix.scr.annotations.sling.SlingServlet;

import org.apache.sling.api.SlingHttpServletRequest;

import org.apache.sling.api.SlingHttpServletResponse;

import org.apache.sling.api.resource.Resource;

import org.apache.sling.api.resource.ResourceUtil;

import org.apache.sling.api.servlets.SlingSafeMethodsServlet;

@SlingServlet(paths = "/bin/permissioncheck/html", generateComponent = true, generateService = true)

public class AuthCheckerServlet extends SlingSafeMethodsServlet {

    public void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) {       

        String uri = request.getParameter("uri");       

        Resource resource = request.getResourceResolver().resolve(uri);       

        if(ResourceUtil.isNonExistingResource(resource)) {           

            response.setStatus(SlingHttpServletResponse.SC_FORBIDDEN);           

            } else {           

            response.setStatus(SlingHttpServletResponse.SC_OK);           

        }       

    }   

}