Subversion Repositories SmartDukaan

package in.shop2020.payment.service.handler;

import in.shop2020.config.ConfigException;

import in.shop2020.payment.domain.Payment;

import in.shop2020.thrift.clients.config.ConfigClient;

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.StringReader;

import java.net.ConnectException;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import java.net.URLEncoder;

import java.util.HashMap;

import java.util.Map;

import java.util.Map.Entry;

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathExpressionException;

import javax.xml.xpath.XPathFactory;

import org.apache.log4j.Logger;

import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

import org.xml.sax.InputSource;

public class EbsPaymentHandler implements IPaymentHandler {

	private static Logger log = Logger.getLogger(Class.class);

	public static final String TXN_ID = "transactionId";

	public static final String PAYMENT_ID = "paymentId";

	public static final String AMOUNT = "amount";

	public static final String DATE_TIME = "dateTime";

	public static final String MODE = "mode";

	public static final String REF_NO = "referenceNo";

	public static final String TXN_TYPE = "transactionType";

    private static String accountId;

    private static String secretKey;

	static{

		try {

			accountId = ConfigClient.getClient().get("ebs_account_id");

			secretKey = ConfigClient.getClient().get("ebs_secret_key");

		} catch (ConfigException e) {

			log.error("Unable to get EBS payment configuration.", e);

		}

	}

	/**

	 * Capture the amount which was authorized for this payment Id. Makes

	 * requests over the network and so internet connectivity is must for it to

	 * succeed.

	 * 

	 * @param amount

	 *            The amount to be captured. Must be the same value which was

	 *            authorized for this payment.

	 * @param paymentId

	 *            The payment ID generated by the gateway.

	 * @return A Map. The Map will definitely have status and will have error

	 *         information in case of error and txn information in case of

	 *         success. In case there is an error in processing, the returned

	 *         result map will be empty.

	 */

	public static Map<String, String> capturePayment(Payment payment){

	    double amount = payment.getAmount();

	    String paymentId = payment.getGatewayPaymentId();

		System.out.println("Capturing amount: Rs " + amount + " for payment Id: " + paymentId);

		URL url = null;

	    URLConnection urlConn = null;

	    DataOutputStream printout;

	    BufferedReader reader;

	    Map<String, String> resultMap = new HashMap<String, String>();

	    //Prepare resultMap to elicit failure behaviour in case anything goes wrong.

	    resultMap.put(STATUS, "");

		/*

		 * HDFC Insanity

		 * 

		 * If we don't set this property, all payments through HDFC will fail if

		 * the first payment is made through EBS.

		 * 

		 * The JAR file provided by HDFC requires that the instances of

		 * HttpsURLConnection returned by a call to URL.openConnection be an

		 * instance of com.sun.net.ssl.HttpsURLConnection. Java versions before

		 * 1.4 used to return an instance of this class which goes against the

		 * current policy of using instances of undocumented internal classes of

		 * JDK since they can change at any time. This behaviour was changed in

		 * JAVA 1.4 to return instances of javax.net.ssl.HttpsURLConnection.

		 * However, it appears, that to allow clients with JDK 1.4 and earlier,

		 * HDFC favours the use of the deprecated class.

		 */

	    System.setProperty("https.protocols", "TLSv1");

	    try {

		    // URL of CGI-Bin script.

			url = new URL("https://api.secure.ebs.in/api/1_0");

		    // URL connection channel.

		    urlConn = url.openConnection();

		    //urlConn.setRequestMethod("POST");

	    } catch (MalformedURLException e1) {

	    	log.error(Errors.CAPTURE_FAILURE.message, e1);

			resultMap.put(ERR_CODE, Errors.CAPTURE_FAILURE.code);

			resultMap.put(ERROR, Errors.CAPTURE_FAILURE.message);

			return resultMap;

		} catch (IOException e) {

			log.error("Unable to initialize connection to EBS API server", e);

			resultMap.put(ERR_CODE, Errors.CONN_FAILURE.code);

			resultMap.put(ERROR, Errors.CONN_FAILURE.message);

			return resultMap;

		}

	    // Let the run-time system (RTS) know that we want input.

	    urlConn.setDoInput (true);

	    // Let the RTS know that we want to do output.

	    urlConn.setDoOutput (true);

	    // No caching, we want the real thing.

	    urlConn.setUseCaches (false);

	    // Specify the content type.

	    urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

	    // Send POST output.

	    try {

			printout = new DataOutputStream (urlConn.getOutputStream ());

		    String content =

			    "Action=" + URLEncoder.encode("capture", "UTF-8") +

			    "&AccountID=" + URLEncoder.encode(accountId, "UTF-8") +

			    "&SecretKey=" + URLEncoder.encode(secretKey, "UTF-8") +

			    "&Amount=" + URLEncoder.encode(""+amount, "UTF-8") +

			    "&PaymentID=" + URLEncoder.encode(paymentId, "UTF-8") +

			    "&submitted=Submit";

		    printout.writeBytes (content);

		    printout.flush ();

		    printout.close ();

		    // Get response data.

		    reader = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));

		    resultMap = parseCaptureOutput(reader);

		    reader.close ();

	    }

	    catch(ConnectException e) {

            log.error("Unable to initialize connection to EBS API server", e);

            resultMap.put(ERR_CODE, Errors.CONN_FAILURE.code);

            resultMap.put(ERROR, Errors.CONN_FAILURE.message);

            return resultMap;

        } 

	    catch (IOException e) {

	    	log.error(Errors.CAPTURE_FAILURE.message, e);

			resultMap.clear();

			resultMap.put(STATUS, "");

			resultMap.put(ERR_CODE, Errors.CAPTURE_FAILURE.code);

			resultMap.put(ERROR, Errors.CAPTURE_FAILURE.message);

		}

	    return resultMap;

	}

	/**

	 * Parses the given input stream and returns a map containing the

	 * transaction details

	 * 

	 * @param reader The reader containing the response of the capture request.

	 * @return A Map. The Map will definitely have status and will have error

	 *         information in case of error and txn information in case of

	 *         success.

	 */

	private static Map<String, String> parseCaptureOutput(BufferedReader reader){

		Map<String, String> resultMap = new HashMap<String, String>();

		resultMap.put(STATUS, "");

		String str = null;

		try {

			str = reader.readLine();

			log.info("Capture response: " + str);

		} catch (IOException e) {

			log.error("Error reading the capture response:", e);

			return resultMap;

		}

		InputSource inputSource = new InputSource(new StringReader(str));

		XPath xpath = XPathFactory.newInstance().newXPath();

		String expression = "/output";

		NodeList nodes = null;

		try {

			nodes = (NodeList) xpath.evaluate(expression, inputSource,	XPathConstants.NODESET);

		} catch(XPathExpressionException xpee) {

			log.error("Input couldn't be parsed. See capture response for more info.");

			return resultMap;

		}

		Element elem = (Element) nodes.item(0);

		String status = elem.getAttribute(STATUS);

		resultMap.put(STATUS, status);

		if("".equals(status) || !"Processing".equals(status)){

			//We've received an error. Retrieve the error values

			resultMap.put(ERR_CODE, elem.getAttribute(ERR_CODE));

			resultMap.put(ERROR, elem.getAttribute(ERROR));

		}else{

			resultMap.put(CAPTURE_TXN_ID, elem.getAttribute(TXN_ID));

			resultMap.put(PAYMENT_ID, elem.getAttribute(PAYMENT_ID));

			resultMap.put(AMOUNT, elem.getAttribute(AMOUNT));

			resultMap.put(CAPTURE_TIME, elem.getAttribute(DATE_TIME));

			resultMap.put(MODE, elem.getAttribute(MODE));

			resultMap.put(REF_NO, elem.getAttribute(REF_NO));

			resultMap.put(TXN_TYPE, elem.getAttribute(TXN_TYPE));

		}

		log.info("Parsed capture response:");

		for(Entry<String, String> entry : resultMap.entrySet()){

			log.info("Key: " + entry.getKey() + ", Value: " + entry.getValue());

		}

		return resultMap;

	}

	/**

	 * Refund the amount which was captured for this payment Id. Makes

	 * requests over the network and so internet connectivity is must for it to

	 * succeed.

	 * 

	 * @param amount

	 *            The amount to be refunded.

	 * @param paymentId

	 *            The payment ID generated by the gateway.

	 * @return A Map. The Map will definitely have status and will have error

	 *         information in case of error and txn information in case of

	 *         success. In case there is an error in processing, the returned

	 *         result map will be empty.

	 */

	public static Map<String, String> refundPayment(Payment payment, double amount){

	    String paymentId = payment.getGatewayPaymentId();

		System.out.println("Refunding amount: Rs " + amount + " for payment Id: " + paymentId);

		URL url = null;

	    URLConnection urlConn = null;

	    DataOutputStream printout;

	    BufferedReader reader;

	    Map<String, String> resultMap = new HashMap<String, String>();

	    //Prepare resultMap to elicit failure behaviour in case anything goes wrong.

	    resultMap.put(STATUS, "");

		/*

		 * HDFC Insanity

		 * 

		 * If we don't set this property, all payments through HDFC will fail if

		 * the first payment is made through EBS.

		 * 

		 * The JAR file provided by HDFC requires that the instances of

		 * HttpsURLConnection returned by a call to URL.openConnection be an

		 * instance of com.sun.net.ssl.HttpsURLConnection. Java versions before

		 * 1.4 used to return an instance of this class which goes against the

		 * current policy of using instances of undocumented internal classes of

		 * JDK since they can change at any time. This behaviour was changed in

		 * JAVA 1.4 to return instances of javax.net.ssl.HttpsURLConnection.

		 * However, it appears, that to allow clients with JDK 1.4 and earlier,

		 * HDFC favours the use of the deprecated class.

		 */

	    System.setProperty("https.protocols", "TLSv1");

	    try {

		    // URL of CGI-Bin script.

			url = new URL("https://api.secure.ebs.in/api/1_0");

		    // URL connection channel.

		    urlConn = url.openConnection();

		    //urlConn.setRequestMethod("POST");

	    } catch (MalformedURLException e1) {

	    	log.error(Errors.CAPTURE_FAILURE.message, e1);

			resultMap.put(ERR_CODE, Errors.CAPTURE_FAILURE.code);

			resultMap.put(ERROR, Errors.CAPTURE_FAILURE.message);

			return resultMap;

		} catch (IOException e) {

			log.error("Unable to initialize connection to EBS API server", e);

			resultMap.put(ERR_CODE, Errors.CONN_FAILURE.code);

			resultMap.put(ERROR, Errors.CONN_FAILURE.message);

			return resultMap;

		}

	    // Let the run-time system (RTS) know that we want input.

	    urlConn.setDoInput (true);

	    // Let the RTS know that we want to do output.

	    urlConn.setDoOutput (true);

	    // No caching, we want the real thing.

	    urlConn.setUseCaches (false);

	    // Specify the content type.

	    urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

	    // Send POST output.

	    try {

			printout = new DataOutputStream (urlConn.getOutputStream ());

		    String content =

			    "Action=" + URLEncoder.encode("refund", "UTF-8") +

			    "&AccountID=" + URLEncoder.encode(accountId, "UTF-8") +

			    "&SecretKey=" + URLEncoder.encode(secretKey, "UTF-8") +

			    "&Amount=" + URLEncoder.encode(""+amount, "UTF-8") +

			    "&PaymentID=" + URLEncoder.encode(paymentId, "UTF-8") +

			    "&submitted=Submit";

		    printout.writeBytes (content);

		    printout.flush ();

		    printout.close ();

		    // Get response data.

		    reader = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));

		    resultMap = parseCaptureOutput(reader);

		    resultMap.put(REFUND_TXN_ID, resultMap.get(CAPTURE_TXN_ID));

		    resultMap.put(REFUND_TIME, resultMap.get(CAPTURE_TIME));

		    resultMap.remove(CAPTURE_TXN_ID);

		    resultMap.remove(CAPTURE_TIME);

		    reader.close ();

	    }

	    catch(ConnectException e) {

            log.error("Unable to initialize connection to EBS API server", e);

            resultMap.put(ERR_CODE, Errors.CONN_FAILURE.code);

            resultMap.put(ERROR, Errors.CONN_FAILURE.message);

            return resultMap;

        } 

	    catch (IOException e) {

	    	log.error(Errors.CAPTURE_FAILURE.message, e);

			resultMap.clear();

			resultMap.put(STATUS, "");

			resultMap.put(ERR_CODE, Errors.CAPTURE_FAILURE.code);

			resultMap.put(ERROR, Errors.CAPTURE_FAILURE.message);

		}

	    return resultMap;

	}

	public static void main(String[] args){

	    Payment p = new Payment();

	    p.setGatewayPaymentId("30573297");

	    p.setAmount(20);

	    capturePayment(p);

	}

}