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Jakarta Struts Cookbook
book

Jakarta Struts Cookbook

by Bill Siggelkow
February 2005
Intermediate to advanced content levelIntermediate to advanced
528 pages
12h 53m
English
O'Reilly Media, Inc.
Content preview from Jakarta Struts Cookbook

11.1. Securing Actions Using a Base Action

Problem

You need to ensure that users are logged in before they can access certain actions.

Solution

Create a base Action, like the one shown in Example 11-1, which implements the security policy.

Example 11-1. Enforcing authentication with a base action

package com.oreilly.strutsckbk.ch11;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.webapp.example.Constants;
import org.apache.struts.webapp.example.User;

public abstract class SecureAction extends Action {
    
    // final so cannot be overridden
    public final ActionForward execute(ActionMapping mapping, 
                                 ActionForm form,
                                 HttpServletRequest request, 
                                 HttpServletResponse response) 
            throws Exception {
        HttpSession session = request.getSession( );
        User user = (User) session.getAttribute(Constants.USER_KEY);
 
        // send back to the logon page if no user
        if (user == null) return (mapping.findForward("logon"));

        return doExecute(mapping, form, request, response, user);
    }

    public abstract ActionForward doExecute(ActionMapping mapping, 
                                            ActionForm form,
                                            HttpServletRequest request, 
                                            HttpServletResponse response, 
                                            User user) throws Exception;
}

Concrete Actions that require this policy extend the base SecureAction, shown in Example 11-2

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Publisher Resources

ISBN: 059600771XSupplemental ContentErrata Page