/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE400_Resource_Exhaustion__getQueryString_Servlet_write_41.java
Label Definition File: CWE400_Resource_Exhaustion.label.xml
Template File: sources-sinks-41.tmpl.java
*/
/*
 * @description
 * CWE: 400 Resource Exhaustion
 * BadSource: getQueryString_Servlet Parse id param out of the URL query string (without using getParameter())
 * GoodSource: A hardcoded non-zero, non-min, non-max, even number
 * Sinks: write
 *    GoodSink: Write to a file count number of times, but first validate count
 *    BadSink : Write to a file count number of times
 * Flow Variant: 41 Data flow: data passed as an argument from one method to another in the same class
 *
 * */




import javax.servlet.http.*;


import java.util.StringTokenizer;
import java.util.logging.Level;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.BufferedWriter;
import java.io.IOException;


public class CWE400_Resource_Exhaustion__getQueryString_Servlet_write_41 extends AbstractTestCaseServlet
{
    private void badSink(int count , HttpServletRequest request, HttpServletResponse response) throws Throwable
    {

        File file = new File("badSink.txt");
        FileOutputStream streamFileOutput = new FileOutputStream(file);
        OutputStreamWriter writerOutputStream = new OutputStreamWriter(streamFileOutput, "UTF-8");
        BufferedWriter writerBuffered = new BufferedWriter(writerOutputStream);
        int i;

        /* POTENTIAL FLAW: Do not validate count before using it as the for loop variant to write to a file */
        for (i = 0; i < count; i++)
        {
            try
            {
                writerBuffered.write("Hello");
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream writing", exceptIO);
            }
        }

        /* Close stream reading objects */
        try
        {
            if (writerBuffered != null)
            {
                writerBuffered.close();
            }
        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "Error closing BufferedWriter", exceptIO);
        }

        try
        {
            if (writerOutputStream != null)
            {
                writerOutputStream.close();
            }
        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "Error closing OutputStreamWriter", exceptIO);
        }

        try
        {
            if (streamFileOutput != null)
            {
                streamFileOutput.close();
            }
        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "Error closing FileOutputStream", exceptIO);
        }

    }

    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int count;

        count = Integer.MIN_VALUE; /* initialize count in case id is not in query string */

        /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParam) */
        {
            StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");

            while (tokenizer.hasMoreTokens())
            {
                String token = tokenizer.nextToken(); /* a token will be like "id=33" */
                if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                {
                    try
                    {
                        count = Integer.parseInt(token.substring(3)); /* set count to the int 33 */
                    }
                    catch(NumberFormatException exceptNumberFormat)
                    {
                        IO.logger.log(Level.WARNING, "Number format exception reading id from query string", exceptNumberFormat);
                    }
                    break; /* exit while loop */
                }
            }
        }

        badSink(count , request, response );
    }

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

    private void goodG2BSink(int count , HttpServletRequest request, HttpServletResponse response) throws Throwable
    {

        File file = new File("badSink.txt");
        FileOutputStream streamFileOutput = new FileOutputStream(file);
        OutputStreamWriter writerOutputStream = new OutputStreamWriter(streamFileOutput, "UTF-8");
        BufferedWriter writerBuffered = new BufferedWriter(writerOutputStream);
        int i;

        /* POTENTIAL FLAW: Do not validate count before using it as the for loop variant to write to a file */
        for (i = 0; i < count; i++)
        {
            try
            {
                writerBuffered.write("Hello");
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream writing", exceptIO);
            }
        }

        /* Close stream reading objects */
        try
        {
            if (writerBuffered != null)
            {
                writerBuffered.close();
            }
        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "Error closing BufferedWriter", exceptIO);
        }

        try
        {
            if (writerOutputStream != null)
            {
                writerOutputStream.close();
            }
        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "Error closing OutputStreamWriter", exceptIO);
        }

        try
        {
            if (streamFileOutput != null)
            {
                streamFileOutput.close();
            }
        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "Error closing FileOutputStream", exceptIO);
        }

    }

    /* goodG2B() - use goodsource and badsink */
    private void goodG2B(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int count;

        /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
        count = 2;

        goodG2BSink(count , request, response );
    }

    private void goodB2GSink(int count , HttpServletRequest request, HttpServletResponse response) throws Throwable
    {

        /* FIX: Validate count before using it as the for loop variant to write to a file */
        if (count > 0 && count <= 20)
        {
            File file = new File("goodSink.txt");
            FileOutputStream streamFileOutput = new FileOutputStream(file);
            OutputStreamWriter writerOutputStream = new OutputStreamWriter(streamFileOutput, "UTF-8");
            BufferedWriter writerBuffered = new BufferedWriter(writerOutputStream);
            int i;
            for (i = 0; i < count; i++)
            {
                try
                {
                    writerBuffered.write("Hello");
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error with stream writing", exceptIO);
                }
            }
            /* Close stream reading objects */
            try
            {
                if (writerBuffered != null)
                {
                    writerBuffered.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing BufferedWriter", exceptIO);
            }
            try
            {
                if (writerOutputStream != null)
                {
                    writerOutputStream.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing OutputStreamWriter", exceptIO);
            }
            try
            {
                if (streamFileOutput != null)
                {
                    streamFileOutput.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing FileOutputStream", exceptIO);
            }
        }

    }

    /* goodB2G() - use badsource and goodsink */
    private void goodB2G(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int count;

        count = Integer.MIN_VALUE; /* initialize count in case id is not in query string */

        /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParam) */
        {
            StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");

            while (tokenizer.hasMoreTokens())
            {
                String token = tokenizer.nextToken(); /* a token will be like "id=33" */
                if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                {
                    try
                    {
                        count = Integer.parseInt(token.substring(3)); /* set count to the int 33 */
                    }
                    catch(NumberFormatException exceptNumberFormat)
                    {
                        IO.logger.log(Level.WARNING, "Number format exception reading id from query string", exceptNumberFormat);
                    }
                    break; /* exit while loop */
                }
            }
        }

        goodB2GSink(count , 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);
    }
}
