/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE83_XSS_Attribute__Servlet_getQueryString_Servlet_22b.java
Label Definition File: CWE83_XSS_Attribute__Servlet.label.xml
Template File: sources-sink-22b.tmpl.java
*/
/*
 * @description
 * CWE: 83 Cross Site Scripting (XSS) in attributes; Examples(replace QUOTE with an actual double quote): ?img_loc=http://www.google.comQUOTE%20onerror=QUOTEalert(1) and ?img_loc=http://www.google.comQUOTE%20onerror=QUOTEjavascript:alert(1)
 * BadSource: getQueryString_Servlet Parse id param out of the URL query string (without using getParameter())
 * GoodSource: A hardcoded string
 * Sinks: printlnServlet
 *    BadSink : XSS in img src attribute
 * Flow Variant: 22 Control flow: Flow controlled by value of a public static variable. Sink functions are in a separate file from sources.
 *
 * */





import javax.servlet.http.*;

import java.util.StringTokenizer;

public class CWE83_XSS_Attribute__Servlet_getQueryString_Servlet_22b
{
    public String badSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        if (CWE83_XSS_Attribute__Servlet_getQueryString_Servlet_22a.badPublicStatic)
        {
            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 */
                    }
                }
            }
        }
        else
        {
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = null;
        }
        return data;
    }

    /* goodG2B1() - use goodsource and badsink by setting the static variable to false instead of true */
    public String goodG2B1Source(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        if (CWE83_XSS_Attribute__Servlet_getQueryString_Servlet_22a.goodG2B1PublicStatic)
        {
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = null;
        }
        else
        {

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

        }

        return data;
    }

    /* goodG2B2() - use goodsource and badsink by reversing the blocks in the if in the sink function */
    public String goodG2B2Source(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        if (CWE83_XSS_Attribute__Servlet_getQueryString_Servlet_22a.goodG2B2PublicStatic)
        {
            /* FIX: Use a hardcoded string */
            data = "foo";
        }
        else
        {
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = null;
        }

        return data;
    }
}
