org.gss_project.gss.web.client.FileUploadGearsIEDialog.java Source code

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Here is the source code for org.gss_project.gss.web.client.FileUploadGearsIEDialog.java

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/*
 * Copyright 2009 Electronic Business Systems Ltd.
 *
 * This file is part of GSS.
 *
 * GSS is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GSS 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.gss_project.gss.web.client;

import java.util.List;

import org.gss_project.gss.web.client.rest.RestCommand;

import com.google.gwt.gears.client.desktop.File;
import com.google.gwt.gears.client.httprequest.HttpRequest;
import com.google.gwt.gears.client.httprequest.ProgressEvent;
import com.google.gwt.gears.client.httprequest.ProgressHandler;
import com.google.gwt.gears.client.httprequest.RequestCallback;

/**
 * The 'File upload' dialog box implementation with Google Gears support
 * for IE.
 */
public class FileUploadGearsIEDialog extends FileUploadGearsDialog implements Updateable {

    /**
     * Perform the HTTP request to upload the specified file.
     */
    @Override
    protected void doSend(final List<File> filesRemaining) {
        final GSS app = GSS.get();
        HttpRequest request = factory.createHttpRequest();
        requests.add(request);
        String method = "POST";

        String path;
        final String filename = getFilename(filesRemaining.get(0).getName());
        path = folder.getUri();
        if (!path.endsWith("/"))
            path = path + "/";
        path = path + encode(filename);

        String token = app.getToken();
        String resource = path.substring(app.getApiPath().length() - 1, path.length());
        String date = RestCommand.getDate();
        String sig = RestCommand.calculateSig(method, date, resource, RestCommand.base64decode(token));
        request.open(method, path);
        request.setRequestHeader("X-GSS-Date", date);
        request.setRequestHeader("Authorization", app.getCurrentUserResource().getUsername() + " " + sig);
        request.setRequestHeader("Accept", "application/json; charset=utf-8");
        request.setCallback(new RequestCallback() {
            @Override
            public void onResponseReceived(HttpRequest req) {
                // XXX: No error checking, since IE throws an Internal Error
                // when accessing req.getStatus().
                filesRemaining.remove(0);
                if (filesRemaining.isEmpty()) {
                    finish();
                }
                doSend(filesRemaining);
            }
        });
        request.getUpload().setProgressHandler(new ProgressHandler() {
            @Override
            public void onProgress(ProgressEvent event) {
                double pcnt = (double) event.getLoaded() / event.getTotal();
                progressBars.get(0).setProgress((int) Math.floor(pcnt * 100));
                if (pcnt * 100 == 100)
                    progressBars.remove(0);
            }
        });
        request.send(filesRemaining.get(0).getBlob());
    }

}