PageNotFoundAutoRedirecter.java

package de.flower.rmt.ui.page.error;

import de.flower.common.ui.util.LoggingUtils;
import org.apache.wicket.protocol.http.servlet.ForwardAttributes;
import org.apache.wicket.request.Request;
import org.apache.wicket.request.RequestHandlerStack;
import org.apache.wicket.request.http.handler.RedirectRequestHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

/**
 * Redirects commonly observed old bookmark errors to sensible pages. Avoids displaying 404 page
 * for users that are too lazy to update their bookmarks.
 *
 * @author flowerrrr
 */
@Component
public class PageNotFoundAutoRedirecter {

    private final static Logger log = LoggerFactory.getLogger(PageNotFoundAutoRedirecter.class);

    @Resource(name = "page404RedirectMapping")
    private Map<String, String> redirectMapping = new HashMap<>();

    public void checkAutoRedirect(final Request request) {
        HttpServletRequest servletRequest = (HttpServletRequest) request.getContainerRequest();
        ForwardAttributes forwardAttributes = ForwardAttributes.of(servletRequest);

        String url = redirectMapping.get(forwardAttributes.getServletPath());
        if (url != null) {
            log.info("Redirecting [{}] to [{}]", LoggingUtils.toString(request), url);
            throw new RequestHandlerStack.ReplaceHandlerException(new RedirectRequestHandler(url), false);
        }
    }
}