source: trunk/gli/src/org/greenstone/gatherer/RemoteGreenstoneServer.java@ 10248

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: David Bainbridge, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 2005 New Zealand Digital Library Project
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */

package org.greenstone.gatherer;

import java.io.*;
import java.net.*;
import org.greenstone.gatherer.shell.GShell;


public class RemoteGreenstoneServer
{
    static public void download_url_zip(String col_name, String dir, GShell source, String accept_expr, String reject_expr)
    {
    try {
        String download_cgi  = Gatherer.cgiBase + "download";

        // Send col_name and dir arguments to download cgi
        String col_name_encoded = URLEncoder.encode(col_name,"UTF-8");
        String dir_encoded = URLEncoder.encode(dir,"UTF-8");
        String cgi_args = "c=" + col_name_encoded;
        cgi_args += "&dir=" + dir_encoded + "&a=" + accept_expr + "&r=" + reject_expr;

        URL download_url = new URL(download_cgi);

        System.err.println("**** download cgi = '" + download_cgi + "'");
        System.err.println("**** cgi args = '" + cgi_args + "'");

        URLConnection dl_connection = download_url.openConnection();
        dl_connection.setDoOutput(true);        
        OutputStream dl_os = dl_connection.getOutputStream();

        PrintWriter dl_out = new PrintWriter(dl_os);
        dl_out.println(cgi_args);
        dl_out.close();

        // Download result from running cgi script
        InputStream dl_is = dl_connection.getInputStream();
        BufferedInputStream dl_bis = new BufferedInputStream(dl_is); 
        DataInputStream dl_dbis = new DataInputStream(dl_bis);
            
        // set up output stream for zip download
        String col_dir;
        if (col_name.startsWith("/")) {
        col_dir = Configuration.gsdl_path;
        }
        else {
        col_dir = Gatherer.getCollectDirectoryPath();
        }

        String zip_fname = col_dir + col_name + ".zip";
        FileOutputStream zip_fos = new FileOutputStream(zip_fname);
        BufferedOutputStream zip_bfos = new BufferedOutputStream(zip_fos);
        
        byte[] buf = new byte[1024];
        int len;

        while ((len = dl_dbis.read(buf)) >= 0 && !source.hasSignalledStop()) {
        zip_bfos.write(buf,0,len);
        }

        dl_dbis.close();
        dl_bis.close();
        dl_is.close();

        zip_bfos.close();
        zip_fos.close();

        if(source.hasSignalledStop()) {
        //A cancel has been called. Delete the zip file.
        DebugStream.println("download_url_zip() cancelled. Cleaning up.");
        if(new File(zip_fname).delete()) {
            DebugStream.println("Zip file " + zip_fname + " deleted");
        }
        else {
            DebugStream.println("Zip file " + zip_fname + " NOT deleted (no big deal). Does it exist?");
        }
        }
    }
    catch (Exception error) {
        error.printStackTrace();
    }
    DebugStream.println("Exited download_url_zip");
    }


    static public void upload_url_zip(String col_name, String dir, String delete_type, GShell source)
    {
    final String lineEnd = "\r\n";
    final String twoHyphens = "--";
    final String boundary =  "*****";
    final int maxBufferSize = 1024;

    String col_dir;
    if (col_name.startsWith("/")) {
        col_dir = Configuration.gsdl_path;
    }
    else {
        col_dir = Gatherer.getCollectDirectoryPath();
    }

    String zip_fname = col_dir + col_name + ".zip";
    String upload_cgi = Gatherer.cgiBase + "upload";

    HttpURLConnection conn = null;

    try {
        // Send zip file to server
        File file = new File(zip_fname);
        FileInputStream fileInputStream = new FileInputStream(file);

        // open a URL connection to the Servlet 
        URL url = new URL(upload_cgi);
        System.err.println("**** Uploading to: " + upload_cgi);

        // Open a HTTP connection to the URL
        conn = (HttpURLConnection) url.openConnection();

        conn.setDoInput(true);         // Allow Inputs
        conn.setDoOutput(true);        // Allow Outputs
        conn.setUseCaches(false);      // Don't use a cached copy.
        conn.setRequestMethod("POST"); // Use a post method.

        conn.setRequestProperty("Connection", "Keep-Alive");        
        conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);

        DataOutputStream dos = new DataOutputStream( conn.getOutputStream() );

        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data; name=\"c\"" + lineEnd + lineEnd);
        dos.writeBytes(col_name + lineEnd);
        System.err.println("**** c="+col_name);

        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data; name=\"dir\"" + lineEnd + lineEnd);
        dos.writeBytes(dir + lineEnd);  
        System.err.println("**** dir="+dir);
    
        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data; name=\"del\"" + lineEnd + lineEnd);
        dos.writeBytes(delete_type + lineEnd);  
        System.err.println("**** del="+delete_type);

        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data; name=\"zip\";"
               + " filename=\"" + zip_fname +"\"" + lineEnd);
        dos.writeBytes(lineEnd);
        System.err.println("**** zip (filename)="+zip_fname);

        // create a buffer of maximum size                  
        int bytesAvailable = fileInputStream.available();
        int bufferSize = Math.min(bytesAvailable, maxBufferSize);
        byte[] buffer = new byte[bufferSize];
        
        // read file and write it into form...
        int bytesRead = fileInputStream.read(buffer, 0, bufferSize);

        while (bytesRead > 0) {
        // Check to see if action has been cancelled.
        if (source != null && source.hasSignalledStop()) {
            break;
        }
        dos.write(buffer, 0, bufferSize);
        bytesAvailable = fileInputStream.available();
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);
        }
        
        // send multipart form data necesssary after file data...
        
        dos.writeBytes(lineEnd);
        dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
        
        // close streams
        
        fileInputStream.close();
        dos.flush();
        dos.close();

        // delete zip file
        boolean file_deleted = file.delete();
        if (file_deleted) {
        System.err.println("Zip file " + file.toString() + " deleted");
        }
        else {
        System.err.println("Zip file " + file.toString() + " NOT deleted");
        }
    }
    catch (MalformedURLException ex) {
        System.err.println("Failed on: "+ex);
    }
    
    catch (IOException ioe) {
        System.err.println("Failed on: "+ioe);
    }
    
    // Read server response
    try {
        InputStreamReader isr = new InputStreamReader(conn.getInputStream() );
        BufferedReader bisr = new BufferedReader (isr);
        String str;
        while (( str = bisr.readLine()) != null) {
        System.err.println(str);
        }
        bisr.close();
        
    }
    catch (IOException ioex) {
        System.err.println("From (ServerResponse): "+ioex);
    }
    }
}