/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE113_HTTP_Response_Splitting__getParameter_Servlet_addHeaderServlet_42.java
Label Definition File: CWE113_HTTP_Response_Splitting.label.xml
Template File: sources-sinks-42.tmpl.java
*/
/*
 * @description
 * CWE: 113 HTTP Response Splitting
 * BadSource: getParameter_Servlet Read data from a querystring using getParameter()
 * GoodSource: A hardcoded string
 * Sinks: addHeaderServlet
 *    GoodSink: URLEncode input
 *    BadSink : querystring to addHeader()
 * Flow Variant: 42 Data flow: data returned from one method to another in the same class
 *
 * */




import javax.servlet.http.*;


import java.net.URLEncoder;

public class CWE113_HTTP_Response_Splitting__getParameter_Servlet_addHeaderServlet_42 extends AbstractTestCaseServlet
{
    private String badSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        /* POTENTIAL FLAW: Read data from a querystring using getParameter */
        data = request.getParameter("name");

        return data;
    }

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

        /* POTENTIAL FLAW: Input from file not verified */
        if (data != null)
        {
            response.addHeader("Location", "/author.jsp?lang=" + data);
        }

    }

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

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

        return data;
    }

    private void goodG2B(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data = goodG2BSource(request, response);

        /* POTENTIAL FLAW: Input from file not verified */
        if (data != null)
        {
            response.addHeader("Location", "/author.jsp?lang=" + data);
        }

    }

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

        /* POTENTIAL FLAW: Read data from a querystring using getParameter */
        data = request.getParameter("name");

        return data;
    }

    private void goodB2G(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data = goodB2GSource(request, response);

        /* FIX: use URLEncoder.encode to hex-encode non-alphanumerics */
        if (data != null)
        {
            data = URLEncoder.encode(data, "UTF-8");
            response.addHeader("Location", "/author.jsp?lang=" + data);
        }

    }

    public void good(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        goodG2B(request, response);
        goodB2G(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);
    }
}
