annis.gui.requesthandler.ShortenerRequestHandler.java Source code

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Here is the source code for annis.gui.requesthandler.ShortenerRequestHandler.java

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/*
 * Copyright 2015 Corpuslinguistic working group Humboldt University Berlin.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package annis.gui.requesthandler;

import annis.libgui.Helper;
import com.sun.jersey.api.client.WebResource;
import com.vaadin.server.RequestHandler;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinResponse;
import com.vaadin.server.VaadinServletResponse;
import com.vaadin.server.VaadinSession;
import java.io.IOException;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Thomas Krause <krauseto@hu-berlin.de>
 */
public class ShortenerRequestHandler implements RequestHandler {

    @Override
    public boolean handleRequest(VaadinSession session, VaadinRequest request, VaadinResponse response)
            throws IOException {

        String id = request.getParameter("id");
        if (id == null) {
            return false;
        }

        // get the actual URL
        WebResource res = Helper.getAnnisWebResource();
        res = res.path("shortener").path(id);
        String longURL = res.get(String.class);

        // redirects only work in http servlets
        if (response instanceof VaadinServletResponse) {
            ServletResponse servletResponse = ((VaadinServletResponse) response).getResponse();
            if (servletResponse instanceof HttpServletResponse) {
                HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
                httpResponse.setHeader("Location", request.getContextPath() + longURL);
                httpResponse.setStatus(307); // temporary redirect
                return true;
            }
        }
        return false;
    }

}