UploadServlet.java

/*
 *
 *  * JBoss, Home of Professional Open Source.
 *  * Copyright 2011, Red Hat, Inc., and individual contributors
 *  * as indicated by the @author tags. See the copyright.txt file in the
 *  * distribution for a full listing of individual contributors.
 *  *
 *  * This is free software; you can redistribute it and/or modify it
 *  * under the terms of the GNU Lesser General Public License as
 *  * published by the Free Software Foundation; either version 2.1 of
 *  * the License, or (at your option) any later version.
 *  *
 *  * This software is distributed in the hope that it will be useful,
 *  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  * Lesser General Public License for more details.
 *  *
 *  * You should have received a copy of the GNU Lesser General Public
 *  * License along with this software; if not, write to the Free
 *  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 *  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 *
 */

package org.jboss.capedwarf.blobstore;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.blobstore.BlobstoreServiceFactory;
import com.google.appengine.api.blobstore.UploadOptions;
import org.jboss.capedwarf.common.config.CapedwarfEnvironment;
import org.jboss.capedwarf.common.url.URLUtils;

/**
 * @author <a href="mailto:marko.luksa@gmail.com">Marko Luksa</a>
 */
public class UploadServlet extends HttpServlet {
    private ExposedBlobstoreService service;

    public static final String URI = "/_ah/blobstore/upload";
    private static final String SUCCESS_PATH_PARAM = "successPath";

    protected static final String MAX_PER_BLOB = "maxPerBlob";
    protected static final String MAX_ALL = "maxAll";
    protected static final String BUCKET_NAME = "bucketName";

    @Override
    public void init() throws ServletException {
        super.init();
        service = (ExposedBlobstoreService) BlobstoreServiceFactory.getBlobstoreService();
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        if (service.storeUploadedBlobs(request, response)) {
            request.getRequestDispatcher(getSuccessPath(request)).forward(request, response);
        }
    }

    private String getSuccessPath(HttpServletRequest request) {
        return request.getParameter(SUCCESS_PATH_PARAM);
    }

    public static String createUploadUrl(String successPath, UploadOptions options) {
        StringBuilder sb = new StringBuilder(getServletUrl());
        sb.append("?");
        sb.append(SUCCESS_PATH_PARAM).append("=").append(URLUtils.encode(successPath));
        if (options != null) {
            UploadOptionsAdapter adapter = new UploadOptionsAdapter(options);
            if (adapter.hasMaxUploadSizeBytesPerBlob()) {
                sb.append("&").append(MAX_PER_BLOB).append("=").append(adapter.getMaxUploadSizeBytesPerBlob());
            }
            if (adapter.hasMaxUploadSizeBytes()) {
                sb.append("&").append(MAX_ALL).append("=").append(adapter.getMaxUploadSizeBytes());
            }
            if (adapter.hasGoogleStorageBucketName()) {
                sb.append("&").append(BUCKET_NAME).append("=").append(URLUtils.encode(adapter.getGoogleStorageBucketName()));
            }
        }
        return sb.toString();
    }

    private static String getServletUrl() {
        return CapedwarfEnvironment.getThreadLocalInstance().getBaseApplicationUrl() + URI;
    }

}