Adding Web Payment Systems

package psoft.hsphere.payment;

import psoft.hsphere.Session;
import psoft.hsphere.resource.admin.MerchantManager;
import psoft.hsphere.resource.tt.Ticket;
import psoft.util.freemarker.TemplateString;
import psoft.util.freemarker.TemplateMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.StringTokenizer;

import freemarker.template.Template;
import freemarker.template.SimpleHash;


public class ExampleWebPaymentServlet  extends ExternalPayServlet {
    private static final String GATEWAY = "ExampleWebPayment";


    //The below method is called when web payment system or H-Sphere
    //calls this ExampleWebPayment servlet.
    public void service(HttpServletRequest request,
                        HttpServletResponse response)
        throws ServletException, IOException
    {
        psoft.hsphere.CP.getCP().setConfig();
        //If the servlet is called by H-Sphere
        //(to redirect customers to the payment page on the Web Payment System
        //side), the request value will contain paramter "action"
        String action = request.getParameter("action");
        if ("redirect".equals(action)) {
            //in this case the code redirects users to
            //the web payment system page
            getProcessForm(request, response);
        } else {
            //in this case, the request parameters are checked
            //and if they are correct, the user's balance is debited
            processPayment(request, response);
        }
    }

    protected void getProcessForm(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException
    {
        try {
            response.setContentType("text/html");
            Session.save();

            //The cp_url, trnas_id, amount and description parameters
            //are received from the request
            String cpUrl = request.getParameter("cp_url");
            if (cpUrl == null ||
                        "".equals(cpUrl))
            {
                throw new Exception("Empty cp_url parameter");
            }
            String trDesc = request.getParameter("trans_id");
            if ((trDesc == null)
                    || "".equals(trDesc)) {
                throw new Exception("Empty transaction ID");
            }
            String amount = request.getParameter("amount");
            if ((amount == null)
                    || "".equals(amount)) {
                throw new Exception("Empty amount for trans ID:" + trDesc);
            }

            String description = request.getParameter("description");
            setResellerId(trDesc);
            //the below instruction extracts the parameters that were set while
            //configuring web payment system (e.g. merchant ID, login etc.)
            HashMap values = MerchantManager.getProcessorSettings(GATEWAY);
            //the below instruction checks if the web payement system is active
            if (!"1".equals(values.get("enabled"))) {
                throw new Exception("ExampleWebPayment is not available");
            }
            //the below set of instructions extracts expample.sbm template
            String template_name = "submit/billing/example.sbm";
            Template template = Session.getTemplate(template_name);

            if (null == template) {
                processEmptyResponse(request, response, "Template " + template_name + " is not exist");
                return;
            }
            SimpleHash root = new SimpleHash();
            root.put("trDesc", new TemplateString(trDesc));
            root.put("values", new TemplateMap(values));
            root.put("amount", new TemplateString(amount));
            root.put("servlet_url", new TemplateString(cpUrl + SERVLETPATH
                    + values.get("servlet")));
            root.put("description", new TemplateString(description));
            root.put("invoice", new TemplateString(
                    String.valueOf(Session.getNewIdAsLong()) + "-" + trDesc));
            template.process(root, response.getWriter());
        } catch (Exception e) {
            log.warn("Unable to process transaction", e);
            Ticket.create(e, null);
            processEmptyResponse(request, response, "The payment can't be processed: "+e.getMessage());
        } finally {
            try {
                Session.restore();
            } catch (Exception ex) {
            }
        }
    }

    protected void processPayment(HttpServletRequest request,
                                  HttpServletResponse response)
        throws ServletException, IOException
    {
        //several specific hsphere variables were included in the
        //request sent earlier by getProcessForm(...) method
        //and example.sbm template (described above)
        //Now these values should be extracted trom the received request.
        //This way the invoice value as well as some other values
        //described below should be initialized.
        //invoice value should have the following format:
        // hsphere_generated_transaction_id-acc-accountID
        // hsphere_generated_transaction_id-sig-signupID
        // hsphere_generated_transaction_id-mail-accountID
        String invoice = request.getParameter("parameter_name_in_the_payment_system_request");
        //the below instruction gets the amount value from the request
        double amount =Double.parseDouble(request.getParameter("parameter_name_in_the_payment_system_request"));
        //here using the request you should check if the payment was sucessful
        //if the payment was successful, run the following set of instructions:
        StringTokenizer tokenizer = new StringTokenizer(invoice, "-");
        String transID = "";
        String accInfo = "";
        short success = 0;
        try {
            try {
                Session.save();
                tokenizer = new StringTokenizer(invoice, "-");
                transID = tokenizer.nextToken().trim();
                accInfo = invoice.substring(transID.length()+1);
                setResellerId(accInfo);

                //the below instruction adds payment to the user's billing balance
                setPayment(amount, transID, invoice, GATEWAY);
                success = 1;
            } catch (Exception e) {
                log.warn("Unable to add payment to the ", e);
            } finally {
                Session.restore();
            }
        } catch (Exception e) {
            log.warn("Unable to process transaction", e);
        }
        printResultPage(response, success);
    }

    private void printResultPage(HttpServletResponse response,
                                 int status)
            throws IOException
    {
        response.setContentType("text/html");
        PrintWriter out = new PrintWriter(response.getWriter());
        out.println("<html><body>");
        switch (status) {
            case 0 :
                out.println("Unable to process transaction");
                break;
            case 1 :
                out.println("Transaction has been completed successfully.");
                break;
            default :
                out.println("Unable to process transaction");
                break;
        }
        out.println("</body></html>");
        out.close();
    }

}

<!-- BEGIN ./admin/merchant/WebPayment.html -->
<assign template="admin/merchant/WebPayment.html">
<include "functions">
<call draw_menu("merchant_view")>
<include "control/admin/merchant/WebPayment.html">
<call bottom()>
<!-- END ./admin/merchant/WebPayment.html -->

<!-- BEGIN ./common/control/admin/merchant/WebPayment.html -->
<assign mm=account.getChild("merchant_manager")>
<call draw_tooltip()>
<table width="70%" border="0" cellspacing="0"
cellpadding="0" align="CENTER" bgcolor="${design.color("border_color")}">
<tr><td>
<table width="100%" border="0" cellspacing="1"
cellpadding="3" align="CENTER">
<tr bgcolor="${HEADER_COLOR}">
<td colspan=2><call draw_header(lang.admin.webpayment.header)></td>
</tr>
<form action="${config.CLIENT_CP_URL}" method="POST"accept-charset="UTF-8">
<input type="hidden" name="template_name"value="submit/admin/merchant/WebPayment.sbm">
<input type="hidden" name="ftemplate" value="${template}">
<input type="hidden" name="stemplate" value="admin/merchant/view.html">
<tr bgcolor="${LIGHT_STRIP}">
<td><call draw_label(lang.admin.webpayment.value_1)></td>
<td><input type="text" name="value_1" value="${settings.WebPayment_VALUE_1}"></td>
</tr>
<td><call draw_label(lang.admin.webpayment.value_2)></td>
<td><input type="text" name="value_1" value="${settings.WebPayment_VALUE_2}"></td>
</tr>
...
...
...
<td><call draw_label(lang.admin.webpayment.value_N)></td>
<td><input type="text" name="value_N" value="${settings.WebPayment_VALUE_N}"></td>
</tr>

<if request.enabled == "1">
<assign venabled="CHECKED"><else><assignvenabled="">
</if>
<tr bgcolor="${LIGHT_STRIP}">
<td colspan="2"><input type=checkboxname="enabled" ${venabled}>
<calldraw_label(lang.label.enabled)>
</td>
</tr>
<tr bgcolor="${LIGHT_STRIP}">
<td colspan="2" align="center">
<input type="submit">
</td>
</tr>
</form>
</table>
</td>
</tr>
</table>
<!-- END ./common/control/admin/merchant/WebPayment.html -->

 <assign admin = account.getChild("admin")>
  <assign mm=account.getChild("merchant_manager")>
  <if request.enabled!="">
  <assign enabled="1">
  <else>
  <assign enabled="">
  </if>
  <if admin>
  <assign res=mm.webprocessorparams("WebProcessor", "VALUE_1", request.value_1,
  "VALUE_2", request.value_2,...,"VALUE_N", request.value_n, "enabled",
  enabled)>
  <if res.status=="OK">
    <include request.stemplate>
  <else>
    <assign res=session.addMessage(res.msg)>
    <include request.ftemplate>
  </if>
  </if>
  

<HTML>
<HEAD>
</HEAD>
<BODY BGCOLOR="${design.color("bgcolor")}">
<assign tmp_action = "">https://webpaymentsystem_purchase_page_url">
<FORM name="login" action="${tmp_action}" method="post" accept-charset="UTF-8">
<input type="hidden" name="value_1" value="${values.VALUE_1}">
<input type="hidden" name="value_2" value="${values.VALUE_2}">
...
...
<input type="hidden" name="value_N" value="${values.VALUE_N}">
<input type="hidden" name="desc" value="${description}">
<input type="hidden" name="amount" value="${amount}">
</FORM>

<SCRIPT language="javascript">
window.document.forms['login'].submit();
</SCRIPT>
</BODY>
</HTML>

<servlet>
<servlet-name>psoft.hsphere.payment.WebPaymentServlet</servlet-name>
<servlet-class>psoft.hsphere.payment.WebPaymentServlet</servlet-class>
<init-param>
    <param-name>debug</param-name>
    <param-value>1</param-value>
</init-param>
<init-param>
    <param-name>listings</param-name>
    <param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>psoft.hsphere.payment.WebPaymentServlet</servlet-name>
    <url-pattern>/psoft.hsphere.payment.WebPaymentServlet</url-pattern>
</servlet-mapping>
          

<processor name="WebPayment" description="label.webpayment"
template="admin/merchant/WebPayment.html" servlet="WebPaymentServlet">
        <value name="value_1"/>
        <value name="value_2"/>
...
...
        <value name="value_N"/>
</processor>