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);
		}
	}
}