Subversion Repositories SmartDukaan

/*******************************************************************************
 *  Copyright 2009 Amazon Services.
 *  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://aws.amazon.com/apache2.0
 *  This file 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.
 * ***************************************************************************** 
 *
 *  Marketplace Web Service Java Library
 *  API Version: 2009-01-01
 *  Generated: Wed Feb 18 13:28:48 PST 2009 
 * 
 */

package com.amazonaws.mws.samples;

import in.shop2020.feeds.products.AmazonEnvelope;
import in.shop2020.feeds.products.CE;
import in.shop2020.feeds.products.HandheldOrPDA;
import in.shop2020.feeds.products.Header;
import in.shop2020.feeds.products.Product;
import in.shop2020.feeds.products.StandardProductID;
import in.shop2020.model.v1.catalog.Amazonlisted;
import in.shop2020.model.v1.catalog.CatalogService.Client;
import in.shop2020.model.v1.catalog.CatalogServiceException;
import in.shop2020.thrift.clients.CatalogClient;
import in.shop2020.utils.GmailUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.math.BigInteger;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Random;
import java.util.TimeZone;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.commons.codec.binary.Base64;
import org.apache.thrift.TException;
import org.apache.thrift.transport.TTransportException;
import org.xml.sax.SAXException;

import com.amazonaws.mws.MarketplaceWebService;
import com.amazonaws.mws.MarketplaceWebServiceClient;
import com.amazonaws.mws.MarketplaceWebServiceConfig;
import com.amazonaws.mws.MarketplaceWebServiceException;
import com.amazonaws.mws.model.FeedSubmissionInfo;
import com.amazonaws.mws.model.IdList;
import com.amazonaws.mws.model.ResponseMetadata;
import com.amazonaws.mws.model.SubmitFeedRequest;
import com.amazonaws.mws.model.SubmitFeedResponse;
import com.amazonaws.mws.model.SubmitFeedResult;

/**
 * 
 * Submit Feed Samples
 * 
 * 
 */
public class SubmitFBAListingFeed {

    /**
     * Just add a few required parameters, and try the service Submit Feed
     * functionality
     * 
     * @param args
     *            unused
     *            
     */
    /**
     * @param args
     * @throws TException 
     * @throws CatalogServiceException 
     */
        static java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd-HH:mm:ss");
        static Calendar cal=GregorianCalendar.getInstance();
        final public static String AMAZON_FBA_LISTING_XML = "/home/amazon/FbaListing.xml";
        final public static String AMAZON_FBA_SKU_PREFIX = "FBA";
        final public static boolean PURGE_OR_REPLACE   = false;
        public static  List<Amazonlisted> aItems=null;
        public static List<Long> itemIdsToUpdate=null;
        //public static List<in.shop2020.model.v1.catalog.Item> thriftItems=null;
        //public static Map<Long,AmazonItem> allItemsMap = new HashMap<Long,AmazonItem>();
        
        static{
                
                CatalogClient catalogServiceClient = null;
                try {
                        catalogServiceClient = new CatalogClient();
                } catch (TTransportException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
                Client catalogClient = catalogServiceClient.getClient();
                try {
                        aItems = catalogClient.getAllItemstoListOnFba();
                        //thriftItems = catalogClient.getAllAliveItems();
                        /*InventoryClient inventoryServiceClient = null;
                        try {
                                inventoryServiceClient = new InventoryClient();
                        } catch (TTransportException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        }
                        in.shop2020.model.v1.inventory.InventoryService.Client inventoryClient = inventoryServiceClient.getClient();
                        Map<Long, ItemInventory> availability = inventoryClient.getInventorySnapshot(0);
                        //System.out.println("Availability is " + availability );*/
                        /*for(in.shop2020.model.v1.catalog.Item thriftItem:thriftItems){
                                long availableno=0;
                                if(availability.get(thriftItem.getId())!=null){ 
                                        ItemInventory iteminventory = availability.get(thriftItem.getId());
                                        Map<Long,Long> itemavailability = new HashMap<Long,Long>();
                                        itemavailability = iteminventory.getAvailability();
                                        for (Map.Entry<Long,Long> entry : itemavailability.entrySet()) {
                                                availableno =  availableno + entry.getValue();
                                        }
                                }       
                                AmazonItem item = new AmazonItem(thriftItem.getId(),thriftItem.getModelName(),thriftItem.getModelNumber(),thriftItem.getSellingPrice(),thriftItem.getColor(),availableno);
                                allItemsMap.put(item.getId(),item);

                        }*/
                        
                } catch (TException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
        
        }
    public static void main(String... args) throws CatalogServiceException, TException {

        /**************************************************     **********************
         * Access Key ID and Secret Access Key ID, obtained from:
         * http://aws.amazon.com
         ***********************************************************************/
        

        //public static final String marketplaceId = "A21TJRUUN4KGV";

        
                
        
        final String accessKeyId = "AKIAII3SGRXBJDPCHSGQ";
        final String secretAccessKey = "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";

        final String appName = "Test";
        final String appVersion = "1.0";

        MarketplaceWebServiceConfig config = new MarketplaceWebServiceConfig();

        /************************************************************************
         * Uncomment to set the appropriate MWS endpoint.
         ************************************************************************/
        // US
        // config.setServiceURL("https://mws.amazonservices.com");
        // UK
        // config.setServiceURL("https://mws.amazonservices.co.uk");
        // Germany
        // config.setServiceURL("https://mws.amazonservices.de");
        // France
        // config.setServiceURL("https://mws.amazonservices.fr");
        // Italy
        // config.setServiceURL("https://mws.amazonservices.it");
        // Japan
        // config.setServiceURL("https://mws.amazonservices.jp");
        // China
        // config.setServiceURL("https://mws.amazonservices.com.cn");
        // Canada
        // config.setServiceURL("https://mws.amazonservices.ca");
        // India
        config.setServiceURL("https://mws.amazonservices.in");

        /************************************************************************
         * You can also try advanced configuration options. Available options are:
         *
         *  - Signature Version
         *  - Proxy Host and Proxy Port
         *  - User Agent String to be sent to Marketplace Web Service
         *
         ***********************************************************************/

        /************************************************************************
         * Instantiate Http Client Implementation of Marketplace Web Service        
         ***********************************************************************/

        MarketplaceWebService service = new MarketplaceWebServiceClient(
                accessKeyId, secretAccessKey, appName, appVersion, config);


        /************************************************************************
         * Setup request parameters and uncomment invoke to try out sample for
         * Submit Feed
         ***********************************************************************/

        /************************************************************************
         * Marketplace and Merchant IDs are required parameters for all
         * Marketplace Web Service calls.
         ***********************************************************************/
        //final String merchantId = "AF6E300VE0X4D";
        final String merchantId = "AF6E3O0VE0X4D";      
        // marketplaces to which this feed will be submitted; look at the
        // API reference document on the MWS website to see which marketplaces are
        // included if you do not specify the list yourself
        final IdList marketplaces = new IdList(Arrays.asList(
                        "A21TJRUUN4KGV"));

        SubmitFeedRequest requestlisting = new SubmitFeedRequest();
        //SubmitFeedRequest requestinventory = new SubmitFeedRequest();
        //SubmitFeedRequest requestpricing = new SubmitFeedRequest();
        requestlisting.setMerchant(merchantId);
        //requestinventory.setMerchant(merchantId);
        //requestpricing.setMerchant(merchantId);
        requestlisting.setMarketplaceIdList(marketplaces);
        //requestinventory.setMarketplaceIdList(marketplaces);
        //requestpricing.setMarketplaceIdList(marketplaces);
        requestlisting.setFeedType("_POST_PRODUCT_DATA_");
        //requestinventory.setFeedType("_POST_INVENTORY_AVAILABILITY_DATA_");
        //requestpricing.setFeedType("_POST_PRODUCT_PRICING_DATA_");
        // MWS exclusively offers a streaming interface for uploading your
        // feeds. This is because
        // feed sizes can grow to the 1GB+ range - and as your business grows
        // you could otherwise
        // silently reach the feed size where your in-memory solution will no
        // longer work, leaving you
        // puzzled as to why a solution that worked for a long time suddenly
        // stopped working though
        // you made no changes. For the same reason, we strongly encourage you
        // to generate your feeds to
        // local disk then upload them directly from disk to MWS via Java -
        // without buffering them in JavaFileNotFoundException
        // memory in their entirety.
        // Note: MarketplaceWebServiceClient will not retry a submit feed request
        // because there is no way to reset the InputStream from our client. 
        // To enable retry, recreate the InputStream and resubmit the feed
        // with the new InputStream. 
        //
        try {
                
                createFbaListingFeed();
                FileInputStream listingfis = new FileInputStream(AMAZON_FBA_LISTING_XML);
                requestlisting.setContentMD5(computeContentMD5HeaderValue(listingfis));
                        requestlisting.setFeedContent(listingfis);
                } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
                
                try {
                                invokeSubmitFeed(service,requestlisting);
                                Thread.sleep(10);
        //                      invokeSubmitFeed(service,requestinventory);
                //              Thread.sleep(30);
                        //      Thread.sleep(180000);
                        //      invokeSubmitFeed(service,requestpricing);
                        } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }

    }

    /**
     * Submit Feed request sample Uploads a file for processing together with
     * the necessary metadata to process the file, such as which type of feed it
     * is. PurgeAndReplace if true means that your existing e.g. inventory is
     * wiped out and replace with the contents ocf this feed - use with caution
     * (the default is false).
     * 
     * @param service
     *            instance of MarketplaceWebService service
     * @param request
     *            Action to invoke
     */
        public static void invokeSubmitFeed(MarketplaceWebService service,
                        SubmitFeedRequest request) throws InterruptedException {
                boolean retry = false;
                int retryCount = 0;
                while (!retry) {
                        try {

                                SubmitFeedResponse response = service.submitFeed(request);

                                System.out.println("SubmitFeed Action Response");
                                System.out
                                .println("=============================================================================");
                                System.out.println();

                                System.out.print("    SubmitFeedResponse");
                                System.out.println();
                                FeedSubmissionInfo feedSubmissionInfo=null;
                                if (response.isSetSubmitFeedResult()) {
                                        System.out.print("        SubmitFeedResult");
                                        System.out.println();
                                        SubmitFeedResult submitFeedResult = response
                                        .getSubmitFeedResult();
                                        if (submitFeedResult.isSetFeedSubmissionInfo()) {
                                                System.out.print("            FeedSubmissionInfo");
                                                System.out.println();
                                                feedSubmissionInfo = submitFeedResult
                                                .getFeedSubmissionInfo();
                                                if (feedSubmissionInfo.isSetFeedSubmissionId()) {
                                                        System.out.print("                FeedSubmissionId");
                                                        System.out.println();
                                                        System.out.print("                    "
                                                                        + feedSubmissionInfo.getFeedSubmissionId());

                                                        System.out.println();
                                                }
                                                if (feedSubmissionInfo.isSetFeedType()) {
                                                        System.out.print("                FeedType");
                                                        System.out.println();
                                                        System.out.print("                    "
                                                                        + feedSubmissionInfo.getFeedType());
                                                        System.out.println();
                                                }
                                                if (feedSubmissionInfo.isSetSubmittedDate()) {
                                                        System.out.print("                SubmittedDate");
                                                        System.out.println();
                                                        System.out.print("                    "
                                                                        + feedSubmissionInfo.getSubmittedDate());
                                                        System.out.println();
                                                }
                                                if (feedSubmissionInfo.isSetFeedProcessingStatus()) {
                                                        System.out
                                                        .print("                FeedProcessingStatus");
                                                        System.out.println();
                                                        System.out.print("                    "
                                                                        + feedSubmissionInfo.getFeedProcessingStatus());
                                                        System.out.println();
                                                }
                                                if (feedSubmissionInfo.isSetStartedProcessingDate()) {
                                                        System.out
                                                        .print("                StartedProcessingDate");
                                                        System.out.println();
                                                        System.out
                                                        .print("                    "
                                                                        + feedSubmissionInfo
                                                                        .getStartedProcessingDate());
                                                        System.out.println();
                                                }
                                                if (feedSubmissionInfo.isSetCompletedProcessingDate()) {
                                                        System.out
                                                        .print("                CompletedProcessingDate");
                                                        System.out.println();
                                                        System.out.print("                    "
                                                                        + feedSubmissionInfo
                                                                        .getCompletedProcessingDate());
                                                        System.out.println();
                                                }
                                        }
                                }
                                if (response.isSetResponseMetadata()) {
                                        System.out.print("        ResponseMetadata");
                                        System.out.println();
                                        ResponseMetadata responseMetadata = response
                                        .getResponseMetadata();
                                        if (responseMetadata.isSetRequestId()) {
                                                System.out.print("            RequestId");
                                                System.out.println();
                                                System.out.print("                "
                                                                + responseMetadata.getRequestId());
                                                System.out.println();
                                        }
                                }
                                System.out.println(response.getResponseHeaderMetadata());
                                retry =true;
                                System.out.println("============Sleeping For 10 Minutes=============");
                                Thread.sleep(600000);
                                CheckFeedSubmission checkResult = new CheckFeedSubmission();
                                ProcessFeed feedProcessingResult=null;
                                int checkResultCount=0;
                                try {
                                        while (feedProcessingResult == null){
                                                feedProcessingResult = checkResult.getResult(feedSubmissionInfo.getFeedSubmissionId(),"FbaListingFeed",0,itemIdsToUpdate);
                                                if (feedProcessingResult == null){
                                                        checkResultCount++;
                                                        if (checkResultCount == 5){
                                                                String text = "";
                                                                String[] sendTo = { "kshitij.sood@shop2020.in","chandan.kumar@shop2020.in"};
                                                                String emailSubjectTxt = "Unable To Receive FBA Listing Feed Result.Submission Id "+feedSubmissionInfo.getFeedSubmissionId();
                                                                String emailFromAddress = "build@shop2020.in";
                                                                String password = "cafe@nes";
                                                                GmailUtils mailer = new GmailUtils();
                                                                try {
                                                                        mailer.sendSSLMessage(sendTo, emailSubjectTxt, text, emailFromAddress, password, new ArrayList<File>());
                                                                }
                                                                catch (Exception e) {
                                                                        e.printStackTrace();
                                                                }
                                                                System.exit(1);
                                                        }
                                                        System.out.println("=====Feed Result Not Ready Retry Again After 5 Minutes=============");
                                                        Thread.sleep(600000);

                                                }

                                        }

                                } catch (ParserConfigurationException e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                } catch (SAXException e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                } catch (IOException e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                }
                                String emailSubjectTxt="";
                                String[] sendTo;
                                if (Boolean.valueOf(feedProcessingResult.getResult())){
                                        emailSubjectTxt = "FBA Listing Feed Success "+sdf.format(cal.getTime());
                                        sendTo = new String[]{  "kshitij.sood@shop2020.in","chandan.kumar@shop2020.in"};
                                }
                                else {
                                        emailSubjectTxt = "FBA Listing Feed Failure "+sdf.format(cal.getTime());
                                        sendTo = new String[]{  "kshitij.sood@shop2020.in","chandan.kumar@shop2020.in"};
                                }
                                String text = "MessagesProcessed "+feedProcessingResult.getProcessed()+"\n"+"MessagesSuccessful "+feedProcessingResult.getSuccess()+"\n"+"" +
                                "MessagesWithError "+feedProcessingResult.getError()+"\n"+"MessagesWithWarning "+feedProcessingResult.getWarn(); 
                                String emailFromAddress = "build@shop2020.in";
                                String password = "cafe@nes";
                                GmailUtils mailer = new GmailUtils();
                                try {
                                        mailer.sendSSLMessage(sendTo, emailSubjectTxt, text, emailFromAddress, password, "/home/amazon/feedSubmission"+"FbaListingFeed"+"Result.xml" );
                                }
                                catch (Exception ex) {
                                        ex.printStackTrace();
                                }
                                System.out.println();
                        } catch (MarketplaceWebServiceException ex) {

                                System.out.println("Caught Exception: " + ex.getMessage());
                                System.out.println("Response Status Code: " + ex.getStatusCode());
                                System.out.println("Error Code: " + ex.getErrorCode());
                                System.out.println("Error Type: " + ex.getErrorType());
                                System.out.println("Request ID: " + ex.getRequestId());
                                System.out.print("XML: " + ex.getXML());
                                System.out.println("ResponseHeaderMetadata: " + ex.getResponseHeaderMetadata());

                                if (retryCount == 2) {
                                        StringWriter errors = new StringWriter();
                                        ex.printStackTrace(new PrintWriter(errors));
                                        String text = errors.toString(); 
                                        String[] sendTo = {  "kshitij.sood@shop2020.in","chandan.kumar@shop2020.in"};
                                        String emailSubjectTxt = "Unable To Send FBA Listing Feed ";
                                        String emailFromAddress = "build@shop2020.in";
                                        String password = "cafe@nes";
                                        GmailUtils mailer = new GmailUtils();
                                        try {
                                                mailer.sendSSLMessage(sendTo, emailSubjectTxt, text, emailFromAddress, password, new ArrayList<File>());
                                        }
                                        catch (Exception e) {
                                                e.printStackTrace();
                                        }
                                        System.exit(1);
                                }
                                retryCount++;
                                Thread.sleep(60000);
                        }
                }
        }
    
    public static void createFbaListingFeed() throws CatalogServiceException, TException{

        File file = new File(AMAZON_FBA_LISTING_XML);
        AmazonEnvelope amazonenvelope =  new AmazonEnvelope();
        Header header = new Header();
        header.setDocumentVersion("1.0");
        header.setMerchantIdentifier("AF6E3O0VE0X4D");
        header.setOverrideReleaseId(null);
        amazonenvelope.setHeader(header);
        amazonenvelope.setMessageType("Product");
        amazonenvelope.setMarketplaceName(null);
        amazonenvelope.setPurgeAndReplace(PURGE_OR_REPLACE);
        JAXBContext context;
        Marshaller m=null;
        try {
                context = JAXBContext.newInstance(AmazonEnvelope.class);
                m = context.createMarshaller();
        } catch (JAXBException e) {
                e.printStackTrace();
        }


        XMLGregorianCalendar today = null;
        Calendar localCalendar = Calendar.getInstance(TimeZone.getDefault());

        int currentMonth = localCalendar.get(Calendar.MONTH);
        int currentYear = localCalendar.get(Calendar.YEAR);
        int currentDayOfMonth = localCalendar.get(Calendar.DAY_OF_MONTH);


        try {
                today = DatatypeFactory.newInstance()
                .newXMLGregorianCalendar(
                                new GregorianCalendar(currentYear,currentMonth,currentDayOfMonth));
        } catch (DatatypeConfigurationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
        }

        amazonenvelope.setEffectiveDate(today);
        List <AmazonEnvelope.Message> messages = amazonenvelope.getMessage();
        int count=0;
        itemIdsToUpdate = new ArrayList<Long>();
        for(Amazonlisted AItem:aItems){
                //long itemid = AItem.getItemid();
                //if(allItemsMap.get(Long.valueOf(itemid))!=null){
                AmazonEnvelope.Message message = new AmazonEnvelope.Message();
                Product product = new Product();
                product.setSKU(AMAZON_FBA_SKU_PREFIX+String.valueOf(AItem.getItemid()));
                /*System.out.println("Amazon Item id is " + AItem);
                                    System.out.println("Amazon Item id is " + AItem.getItemid());
                                    System.out.println("Item is " + item);
                                    System.out.println("Item id is " + item.getId());
                                    System.out.println("Item color is " + item.getColor());*/
                /*if(AItem.getEan().length() > 0){
                                                StandardProductID spid = new StandardProductID();
                                                spid.setType("EAN");
                                                    spid.setValue(AItem.getEan());
                                                    product.setStandardProductID(spid);
                                            }
                                    else{
                                        if(AItem.getUpc().length() > 0){
                                                StandardProductID spid = new StandardProductID();
                                                spid.setType("UPC");
                                                    spid.setValue(AItem.getUpc());
                                                    product.setStandardProductID(spid);
                                        }
                                    }*/
                StandardProductID spid = new StandardProductID();
                spid.setType("ASIN");
                    spid.setValue(AItem.getAsin());
                    product.setStandardProductID(spid);
                //product.setItemPackageQuantity(BigInteger.valueOf(1));
                //Product.DescriptionData descdata = new Product.DescriptionData();
                /*if(AItem.getCategory_code()==10002)
                {//Buisness Phones
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1389432031));
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1805560031));
                }
                if(AItem.getCategory_code()==10003)
                {//High End media Phones
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1389432031));
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1805560031));
                }
                if(AItem.getCategory_code()==10004)
                {//Low End media Phones
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1389432031));
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1805559031));
                }

                if(AItem.getCategory_code()==10005)
                {//Basic Phones
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1389432031));
                        descdata.getRecommendedBrowseNode().add(BigInteger.valueOf(1805559031));
                }
                descdata.setMfrPartNumber(AItem.getPart_number());
                descdata.setBrand(AItem.getBrand());
                descdata.setAutographed(false);
                descdata.setTitle(AItem.getName());     
                descdata.setManufacturer(AItem.getManufacturer_name());
                descdata.setIsGiftWrapAvailable(true);
                descdata.setIsGiftMessageAvailable(true);*/
                //product.setDescriptionData(descdata);
                //Product.ProductData productdata = new Product.ProductData();
                //CE ce = new CE();
                //ce.setColor(AItem.getColor());        
                //HandheldOrPDA hhd = new HandheldOrPDA();
                //CE.ProductType productype = new CE.ProductType();
                //productype.setHandheldOrPDA(hhd);
                //ce.setProductType(productype);
                //productdata.setCE(ce);
                //product.setProductData(productdata);
                product.setProductTaxCode(AItem.getTaxCode());
                Random rand = new Random();
                message.setMessageID(BigInteger.valueOf(Math.abs(rand.nextInt())));
                message.setProduct(product);
                message.setOperationType("Update");
                messages.add(message);
                itemIdsToUpdate.add(AItem.getItemid());
                count++;
        }       


        try {
                m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
                m.marshal(amazonenvelope, file);
                m.marshal(amazonenvelope, System.out);

        } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
        }

    }


    
    public static String computeContentMD5HeaderValue( FileInputStream fis) {
        try {
                        DigestInputStream dis = new DigestInputStream( fis,
                                        MessageDigest.getInstance( "MD5" ));
                        byte[] buffer = new byte[8192];
                        while( dis.read( buffer ) > 0 );
                        String md5Content = new String(Base64.encodeBase64(dis.getMessageDigest().digest())
                                );
                        // Effectively resets the stream to be beginning of the file via a
                        fis.getChannel().position( 0 );
                        return md5Content;
                } catch (NoSuchAlgorithmException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
                return null;
                
 }


    
    

}