/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE470_Unsafe_Reflection__getQueryString_Servlet_21.java
Label Definition File: CWE470_Unsafe_Reflection.label.xml
Template File: sources-sink-21.tmpl.java
*/
/*
 * @description
 * CWE: 470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
 * BadSource: getQueryString_Servlet Parse id param out of the URL query string (without using getParameter())
 * GoodSource: Set data to a hardcoded class name
 * Sinks:
 *    BadSink : Instantiate class named in data
 * Flow Variant: 21 Control flow: Flow controlled by value of a private variable. All functions contained in one file.
 *
 * */





import javax.servlet.http.*;

import java.util.StringTokenizer;

public class CWE470_Unsafe_Reflection__getQueryString_Servlet_21 extends AbstractTestCaseServlet
{
    /* The variable below is used to drive control flow in the source function */
    private boolean badPrivate = false;

    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        badPrivate = true;
        data = bad_source(request, response);

        /* POTENTIAL FLAW: Instantiate object of class named in data (which may be from external input) */
        Class<?> tempClass = Class.forName(data);
        Object tempClassObject = tempClass.newInstance();

        IO.writeLine(tempClassObject.toString()); /* Use tempClassObject in some way */

    }

    private String bad_source(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        if (badPrivate)
        {
            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;
    }

    /* The variables below are used to drive control flow in the source functions. */
    private boolean goodG2B1_private = false;
    private boolean goodG2B2_private = false;

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

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

        goodG2B1_private = false;
        data = goodG2B1_source(request, response);

        /* POTENTIAL FLAW: Instantiate object of class named in data (which may be from external input) */
        Class<?> tempClass = Class.forName(data);
        Object tempClassObject = tempClass.newInstance();

        IO.writeLine(tempClassObject.toString()); /* Use tempClassObject in some way */

    }

    private String goodG2B1_source(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data = null;

        if (goodG2B1_private)
        {
            /* 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 class name */
            data = "Testing.test";

        }

        return data;
    }

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

        goodG2B2_private = true;
        data = goodG2B2_source(request, response);

        /* POTENTIAL FLAW: Instantiate object of class named in data (which may be from external input) */
        Class<?> tempClass = Class.forName(data);
        Object tempClassObject = tempClass.newInstance();

        IO.writeLine(tempClassObject.toString()); /* Use tempClassObject in some way */

    }

    private String goodG2B2_source(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data = null;

        if (goodG2B2_private)
        {
            /* FIX: Use a hardcoded class name */
            data = "Testing.test";
        }
        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;
    }

    /* 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);
    }

}
