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SiteMesh is a web-page layout and decoration framework and web- application integration framework to aid in creating sites consisting of many pages for which a consistent look/feel, navigation and layout scheme is required.

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package org.sitemesh.grails.plugins.sitemesh3;

import org.grails.web.gsp.io.GrailsConventionGroovyPageLocator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpMethod;
import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.servlet.handler.AbstractHandlerMapping;
import org.springframework.web.servlet.mvc.ParameterizableViewController;

import jakarta.servlet.http.HttpServletRequest;

import java.util.HashMap;
import java.util.Map;

import static org.springframework.http.HttpStatus.NOT_FOUND;

public class GrailsLayoutHandlerMapping extends AbstractHandlerMapping {
    @Autowired
    GrailsConventionGroovyPageLocator groovyPageLocator;

    Map layoutCache = new HashMap<>();

    public GrailsLayoutHandlerMapping() {
        setOrder(-6);
    }

    @Override
    protected Object getHandlerInternal(HttpServletRequest request) {
        if (request.getAttribute("jakarta.servlet.forward.request_uri") == null) {
            return null; // only handle forwarded requests.
        }
        String servletPath = request.getServletPath();
        if (servletPath.startsWith("/layouts")) {
            ParameterizableViewController pvc = layoutCache.get(servletPath);
            if (pvc == null) {
                if (groovyPageLocator.findViewByPath(servletPath) == null) {
                    throw new ResponseStatusException(NOT_FOUND, "Unable to find resource "+servletPath);
                }
                pvc = new ParameterizableViewController();
                pvc.setSupportedMethods(HttpMethod.GET.name(), HttpMethod.HEAD.name(), HttpMethod.POST.name());
                pvc.setViewName(servletPath);
                layoutCache.put(servletPath, pvc);
            }
            return pvc;
        }
        return null;
    }
}