/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE83_XSS_Attribute__Servlet_getQueryString_Servlet_03.java
Label Definition File: CWE83_XSS_Attribute__Servlet.label.xml
Template File: sources-sink-03.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
* BadSink: printlnServlet XSS in img src attribute
* Flow Variant: 03 Control flow: if(5==5) and if(5!=5)
*
* */





import javax.servlet.http.*;

import java.util.StringTokenizer;

public class CWE83_XSS_Attribute__Servlet_getQueryString_Servlet_03 extends AbstractTestCaseServlet
{
    /* uses badsource and badsink */
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;
        if (5 == 5)
        {
            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;
        }

        if (data != null)
        {
            /* POTENTIAL FLAW: Input is not verified/sanitized before use in an image tag */
            response.getWriter().println("<br>bad() - <img src=\"" + data + "\">");
        }

    }

    /* goodG2B1() - use goodsource and badsink by changing 5==5 to 5!=5 */
    private void goodG2B1(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;
        if (5 != 5)
        {
            /* 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";

        }

        if (data != null)
        {
            /* POTENTIAL FLAW: Input is not verified/sanitized before use in an image tag */
            response.getWriter().println("<br>bad() - <img src=\"" + data + "\">");
        }

    }

    /* goodG2B2() - use goodsource and badsink by reversing statements in if */
    private void goodG2B2(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;
        if (5 == 5)
        {
            /* 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;
        }

        if (data != null)
        {
            /* POTENTIAL FLAW: Input is not verified/sanitized before use in an image tag */
            response.getWriter().println("<br>bad() - <img src=\"" + data + "\">");
        }

    }

    public void good(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        goodG2B1(request, response);
        goodG2B2(request, response);
    }

    /* Below is the main(). It is only used when building this testcase on
     * its own for testing or for building a binary to use in testing binary
     * analysis tools. It is not used when compiling all the testcases as one
     * application, which is how source code analysis tools are tested.
     */
    public static void main(String[] args) throws ClassNotFoundException,
           InstantiationException, IllegalAccessException
    {
        mainFromParent(args);
    }
}
