Redirect a URL with Ruby CGI

jrobertson (James Robertson) — Mon, 21 Apr 2008 12:25:30 GMT



#!/usr/bin/ruby



require 'cgi'



cgi = CGI.new

print cgi.header({'Status' => '302 Moved', 'location' =>  'http://www.wired.com'})



url = 'http://www.wired.com/'

print cgi.header({'status'=>'REDIRECT', 'Location'=>url})

References:
RE: cgi redirect [nagaokaut.ac.jp]
Ruby/CGI - assari [mokehehe.com]
HTTP/1.1: Status Code Definitions [w3.org]

Overriding Tomcat Valve to return extended login failure status

NicholasSushkin (Nicholas Sushkin) — Thu, 22 Mar 2007 22:25:21 GMT

See Shade Grown Code for more information.

ExtendedStatusSetter.java



package com.ofc.tomcat;



import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



/**

 * Interface flagging that the implementing Realm can set request

 * headers providing additional information about an authentication

 * failure.

 *

 * @author Nicholas Sushkin

 */

public interface ExtendedStatusSetter

{



    /**

     * The request attribute under which we forward an extended failure status message

     * (as an object of type String) to a login error page.

     */

    public static String LOGIN_FAILURE_MESSAGE_ATTR = 

        "com.ofc.tomcat.LOGIN_FAILURE_MESSAGE";

    

    public void setExtendedStatus(String username, HttpServletRequest request, HttpServletResponse response);

}

ExtendedStatusFormAuthenticator.java



package com.ofc.tomcat;



import org.apache.catalina.authenticator.Constants;

import org.apache.catalina.authenticator.FormAuthenticator;

import org.apache.catalina.Realm;

import org.apache.catalina.connector.Request;

import org.apache.catalina.connector.Response;

import org.apache.catalina.deploy.LoginConfig;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import javax.servlet.RequestDispatcher;



/**

 * Adds extended authentication failure status to tomcat FormAuthenticator.

 *

 * @author Nicholas Sushkin

 */

public class ExtendedStatusFormAuthenticator extends FormAuthenticator

{

    /**

     * Descriptive information about this implementation.

     */

    protected static final String info =

        "com.ofc.tomcat.ExtendedStatusFormAuthenticator/1.0";



    private static Log log = LogFactory.getLog(ExtendedStatusFormAuthenticator.class);



    // ------------------------------------------------------------- Properties

    /**

     * Return descriptive information about this Valve implementation.

     */

    @Override

    public String getInfo() 

    {

        return info;

    }



    // ------------------------------------------------------------- Overridden behavior

    /**

     * Called to forward to the error page

     * 

     * @param request Request we are processing

     * @param response Response we are creating

     * @param config    Login configuration describing how authentication

     *              should be performed

     */

    @Override

    protected void forwardToErrorPage(Request request, Response response, LoginConfig config) 

    {

        Realm realm = context.getRealm();



        if (realm instanceof ExtendedStatusSetter)

        {

            log.debug("realm implements ExtendedStatusSetter, setting extended status for error page");

            String username = request.getParameter(Constants.FORM_USERNAME);

            ((ExtendedStatusSetter) realm).setExtendedStatus(username, request.getRequest(), response.getResponse());

        }

        else

        {

            log.debug("realm does not implement ExtendedStatusSetter, NOT setting extended status for error page");

        }



        RequestDispatcher disp =

            context.getServletContext().getRequestDispatcher

            (config.getErrorPage());

        try {

            disp.forward(request.getRequest(), response.getResponse());

            response.finishResponse();

        } catch (Throwable t) {

            log.warn("Unexpected error forwarding to error page", t);

        }

    }

}

Realm implementation will include the following



public class AccountLockoutDatasourceRealm extends DataSourceRealm implements ExtendedStatusSetter

{

    // ...



    public void setExtendedStatus(String username, HttpServletRequest request, HttpServletResponse response)

    {

        setMessage(request, "Account locked");

    }



    protected void setMessage(HttpServletRequest request, String message)

    {

        request.setAttribute(ExtendedStatusSetter.LOGIN_FAILURE_MESSAGE_ATTR, message);

    }

}

Showing message on status bar

korakot (Korakot Chaovavanich) — Mon, 06 Mar 2006 20:58:42 GMT

There's an empty space below app.title that we can
use as a status bar. So, I modify this recipe and
make it into a module. (need fgimage.pyd from here)



# status.py

from graphics import *

import fgimage

__all__ = ["status_on", "status_off"]



bar = Image.new((119,13))

bgcolor = screenshot().getpixel((0,0))[0]

fg = fgimage.FGImage()



def status_on(message=None):

    if message is not None:

        bar.clear(bgcolor)

        bar.text((0,11), unicode(message), 0xffffff)

    fg.set(57,30, bar._bitmapapi())



def status_off():

    fg.unset()

You can use it easily this way



>>> from status import *

>>> status_on('Hello world')  # show it

>>> status_off()              # hide it

>>>

See a screenshot.

DZone Snippets: status code

Redirect a URL with Ruby CGI

Overriding Tomcat Valve to return extended login failure status

Showing message on status bar