/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE690_NULL_Deref_From_Return__getParameter_Servlet_trim_42.java
Label Definition File: CWE690_NULL_Deref_From_Return.label.xml
Template File: sources-sinks-42.tmpl.java
*/
/*
 * @description
 * CWE: 690 Unchecked return value is null, leading to a null pointer dereference.
 * BadSource: getParameter_Servlet Set data to return of getParameter_Servlet
 * GoodSource: Set data to fixed, non-null String
 * Sinks: trim
 *    GoodSink: Check data for null before calling trim()
 *    BadSink : Call trim() on possibly null object
 * Flow Variant: 42 Data flow: data returned from one method to another in the same class
 *
 * */





import javax.servlet.http.*;

public class CWE690_NULL_Deref_From_Return__getParameter_Servlet_trim_42 extends AbstractTestCaseServlet
{
    private String badSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        /* POTENTIAL FLAW: data may be set to null */
        data = request.getParameter("CWE690");

        return data;
    }

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

        /* POTENTIAL FLAW: data could be null */
        String stringTrimmed = data.trim();

        IO.writeLine(stringTrimmed);

    }

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

        /* FIX: Set data to a fixed, non-null String */
        data = "CWE690";

        return data;
    }

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

        /* POTENTIAL FLAW: data could be null */
        String stringTrimmed = data.trim();

        IO.writeLine(stringTrimmed);

    }

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

        /* POTENTIAL FLAW: data may be set to null */
        data = request.getParameter("CWE690");

        return data;
    }

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

        /* FIX: explicit check for null */
        if (data != null)
        {
            String stringTrimmed = data.trim();
            IO.writeLine(stringTrimmed);
        }

    }

    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);
    }
}
