/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE601_Open_Redirect__Servlet_getParameter_Servlet_03.java
Label Definition File: CWE601_Open_Redirect__Servlet.label.xml
Template File: sources-sink-03.tmpl.java
*/
/*
* @description
* CWE: 601 Open Redirect
* BadSource: getParameter_Servlet Read data from a querystring using getParameter()
* GoodSource: A hardcoded string
* BadSink:  place redirect string directly into redirect api call
* Flow Variant: 03 Control flow: if(5==5) and if(5!=5)
*
* */





import javax.servlet.http.*;


import java.net.URI;
import java.net.URISyntaxException;

public class CWE601_Open_Redirect__Servlet_getParameter_Servlet_03 extends AbstractTestCaseServlet
{
    /* uses badsource and badsink */
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;
        if (5 == 5)
        {
            /* POTENTIAL FLAW: Read data from a querystring using getParameter */
            data = request.getParameter("name");
        }
        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)
        {
            /* This prevents \r\n (and other chars) and should prevent incidentals such
             * as HTTP Response Splitting and HTTP Header Injection.
             */
            URI uri;
            try
            {
                uri = new URI(data);
            }
            catch (URISyntaxException exceptURISyntax)
            {
                response.getWriter().write("Invalid redirect URL");
                return;
            }
            /* POTENTIAL FLAW: redirect is sent verbatim; escape the string to prevent ancillary issues like XSS, Response splitting etc */
            response.sendRedirect(data);
            return;
        }

    }

    /* 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)
        {
            /* This prevents \r\n (and other chars) and should prevent incidentals such
             * as HTTP Response Splitting and HTTP Header Injection.
             */
            URI uri;
            try
            {
                uri = new URI(data);
            }
            catch (URISyntaxException exceptURISyntax)
            {
                response.getWriter().write("Invalid redirect URL");
                return;
            }
            /* POTENTIAL FLAW: redirect is sent verbatim; escape the string to prevent ancillary issues like XSS, Response splitting etc */
            response.sendRedirect(data);
            return;
        }

    }

    /* 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)
        {
            /* This prevents \r\n (and other chars) and should prevent incidentals such
             * as HTTP Response Splitting and HTTP Header Injection.
             */
            URI uri;
            try
            {
                uri = new URI(data);
            }
            catch (URISyntaxException exceptURISyntax)
            {
                response.getWriter().write("Invalid redirect URL");
                return;
            }
            /* POTENTIAL FLAW: redirect is sent verbatim; escape the string to prevent ancillary issues like XSS, Response splitting etc */
            response.sendRedirect(data);
            return;
        }

    }

    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);
    }
}
