/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE643_Xpath_Injection__getQueryString_Servlet_61b.java
Label Definition File: CWE643_Xpath_Injection.label.xml
Template File: sources-sinks-61b.tmpl.java
*/
/*
 * @description
 * CWE: 643 Xpath Injection
 * BadSource: getQueryString_Servlet Parse id param out of the URL query string (without using getParameter())
 * GoodSource: A hardcoded string
 * Sinks:
 *    GoodSink: validate input through StringEscapeUtils
 *    BadSink : user input is used without validate
 * Flow Variant: 61 Data flow: data returned from one method to another in different classes in the same package
 *
 * */





import javax.servlet.http.*;

import java.util.StringTokenizer;

public class CWE643_Xpath_Injection__getQueryString_Servlet_61b
{
    public String badSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        data = ""; /* initialize data in case id is not in query string */

        /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParameter()) */
        {
            StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");
            while (tokenizer.hasMoreTokens())
            {
                String token = tokenizer.nextToken(); /* a token will be like "id=foo" */
                if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                {
                    data = token.substring(3); /* set data to "foo" */
                    break; /* exit while loop */
                }
            }
        }

        return data;
    }

    /* goodG2B() - use goodsource and badsink */
    public String goodG2BSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        /* FIX: Use a hardcoded string */
        data = "foo";

        return data;
    }

    /* goodB2G() - use badsource and goodsink */
    public String goodB2GSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        data = ""; /* initialize data in case id is not in query string */

        /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParameter()) */
        {
            StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");
            while (tokenizer.hasMoreTokens())
            {
                String token = tokenizer.nextToken(); /* a token will be like "id=foo" */
                if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                {
                    data = token.substring(3); /* set data to "foo" */
                    break; /* exit while loop */
                }
            }
        }

        return data;
    }
}
