import java.io.*;
import java.net.*;


/**
 * The "default" servlet.
 *
 * This servlet handles "normal" GET and POST requests.
 *
 * @author  Prof. David Bernstein, James Madison University
 * @version 0.3
 */
public class DefaultHttpServlet extends AbstractHttpServlet
{
    /**
     * Default Constructor
     */
    public DefaultHttpServlet()
    {
       super();
    }

    /**
     * Explicit Value Constructor
     *
     * @param in    The HttpInputStream to read from
     * @param out   The HttpOutputStream to write to
     */
    public DefaultHttpServlet(HttpInputStream in, HttpOutputStream out)
    {
       super(in, out);
    }
    

    /**
     * Handle a GET request
     *
     * @param req    The request to read from
     * @param res    The response to write to
     */
    protected void doGet(HttpRequest req, HttpResponse res)
    {
       byte[]             content;
       FileInputStream    fis;
       int                length;
       MIMETyper          mimeTyper;
       SecurityManager    security;       
       String             uri;


       // Initialization
       mimeTyper = MIMETyper.createInstance();
       uri       = "../public_html/"+ req.getRequestURI();

       // Get the SecurityManager
       security = System.getSecurityManager();

       try 
       {
          // Check for read permission before doing anything
          if (security != null) security.checkRead(uri);

          // Create a stream for the file
          // and determine its length
          fis = new FileInputStream(uri);
          length = fis.available();

          // Set the status
          res.setStatus(HttpResponse.SC_OK);
		
          // Set the content type
          res.setContentType(mimeTyper.getContentTypeFor(uri));

          // Read the file
          content = new byte[length];
          fis.read(content);
          fis.close();
                
          // Put the data in the response
          res.setContent(content);
                
          // Transmit the response
          res.write(out);
       } 
       catch (SecurityException se)
       {
          res.sendError(HttpResponse.SC_FORBIDDEN, out);
       }
       catch (IOException ioe)
       {
          res.sendError(HttpResponse.SC_NOT_FOUND, out);
       }
    }


    /**
     * Handle a POST request
     *
     * @param req    The request to read from
     * @param res    The response to write to
     */
    protected void doPost(HttpRequest req, HttpResponse res)
    {
       res.sendError(HttpResponse.SC_FORBIDDEN, out);
    }
}