| /* |
| * $Header: /home/cvs/jakarta-struts/src/example/org/apache/struts/webapp/example/CheckLogonTag.java,v 1.2 2001/04/14 12:53:07 rleland Exp $ |
| * $Revision: 1.2 $ |
| * $Date: 2001/04/14 12:53:07 $ |
| * |
| * ==================================================================== |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 1999-2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Struts", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| |
| package org.apache.struts.webapp.example; |
| |
| |
| import java.io.IOException; |
| import javax.servlet.http.HttpSession; |
| import javax.servlet.jsp.JspException; |
| import javax.servlet.jsp.JspWriter; |
| import javax.servlet.jsp.PageContext; |
| import javax.servlet.jsp.tagext.TagSupport; |
| import org.apache.struts.action.Action; |
| import org.apache.struts.util.BeanUtils; |
| import org.apache.struts.util.MessageResources; |
| |
| |
| /** |
| * Check for a valid User logged on in the current session. If there is no |
| * such user, forward control to the logon page. |
| * |
| * @author Craig R. McClanahan |
| * @author Marius Barduta |
| * @version $Revision: 1.2 $ $Date: 2001/04/14 12:53:07 $ |
| */ |
| |
| public final class CheckLogonTag extends TagSupport { |
| |
| |
| // --------------------------------------------------- Instance Variables |
| |
| |
| /** |
| * The key of the session-scope bean we look for. |
| */ |
| private String name = Constants.USER_KEY; |
| |
| |
| /** |
| * The page to which we should forward for the user to log on. |
| */ |
| private String page = "/logon.jsp"; |
| |
| |
| // ----------------------------------------------------------- Properties |
| |
| |
| /** |
| * Return the bean name. |
| */ |
| public String getName() { |
| |
| return (this.name); |
| |
| } |
| |
| |
| /** |
| * Set the bean name. |
| * |
| * @param name The new bean name |
| */ |
| public void setName(String name) { |
| |
| this.name = name; |
| |
| } |
| |
| |
| /** |
| * Return the forward page. |
| */ |
| public String getPage() { |
| |
| return (this.page); |
| |
| } |
| |
| |
| /** |
| * Set the forward page. |
| * |
| * @param page The new forward page |
| */ |
| public void setPage(String page) { |
| |
| this.page = page; |
| |
| } |
| |
| |
| // ------------------------------------------------------- Public Methods |
| |
| |
| /** |
| * Defer our checking until the end of this tag is encountered. |
| * |
| * @exception JspException if a JSP exception has occurred |
| */ |
| public int doStartTag() throws JspException { |
| |
| return (SKIP_BODY); |
| |
| } |
| |
| |
| /** |
| * Perform our logged-in user check by looking for the existence of |
| * a session scope bean under the specified name. If this bean is not |
| * present, control is forwarded to the specified logon page. |
| * |
| * @exception JspException if a JSP exception has occurred |
| */ |
| public int doEndTag() throws JspException { |
| |
| // Is there a valid user logged on? |
| boolean valid = false; |
| HttpSession session = pageContext.getSession(); |
| if ((session != null) && (session.getAttribute(name) != null)) |
| valid = true; |
| |
| // Forward control based on the results |
| if (valid) |
| return (EVAL_PAGE); |
| else { |
| try { |
| pageContext.forward(page); |
| } catch (Exception e) { |
| throw new JspException(e.toString()); |
| } |
| return (SKIP_PAGE); |
| } |
| |
| } |
| |
| |
| /** |
| * Release any acquired resources. |
| */ |
| public void release() { |
| |
| super.release(); |
| this.name = Constants.USER_KEY; |
| this.page = "/logon.jsp"; |
| |
| } |
| |
| |
| } |