Source Code Cross Referenced for LogonAction.java in  » Web-Framework » struts-1.3.8 » org » apache » struts » webapp » example2 » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » struts 1.3.8 » org.apache.struts.webapp.example2 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: LogonAction.java 471754 2006-11-06 14:55:09Z husted $
003:         *
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *  http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:
022:        package org.apache.struts.webapp.example2;
023:
024:        import javax.servlet.http.HttpServletRequest;
025:        import javax.servlet.http.HttpServletResponse;
026:        import javax.servlet.http.HttpSession;
027:        import org.apache.commons.beanutils.PropertyUtils;
028:        import org.apache.commons.logging.Log;
029:        import org.apache.commons.logging.LogFactory;
030:        import org.apache.struts.action.Action;
031:        import org.apache.struts.action.ActionMessage;
032:        import org.apache.struts.action.ActionErrors;
033:        import org.apache.struts.action.ActionForm;
034:        import org.apache.struts.action.ActionForward;
035:        import org.apache.struts.action.ActionMapping;
036:        import org.apache.struts.util.ModuleException;
037:
038:        /**
039:         * Implementation of <strong>Action</strong> that validates a user logon.
040:         *
041:         * @author Craig R. McClanahan
042:         * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
043:         */
044:
045:        public final class LogonAction extends Action {
046:
047:            // ----------------------------------------------------- Instance Variables
048:
049:            /**
050:             * The <code>Log</code> instance for this application.
051:             */
052:            private Log log = LogFactory
053:                    .getLog("org.apache.struts.webapp.Example");
054:
055:            // --------------------------------------------------------- Public Methods
056:
057:            /**
058:             * Process the specified HTTP request, and create the corresponding HTTP
059:             * response (or forward to another web component that will create it).
060:             * Return an <code>ActionForward</code> instance describing where and how
061:             * control should be forwarded, or <code>null</code> if the response has
062:             * already been completed.
063:             *
064:             * @param mapping The ActionMapping used to select this instance
065:             * @param form The optional ActionForm bean for this request (if any)
066:             * @param request The HTTP request we are processing
067:             * @param response The HTTP response we are creating
068:             *
069:             * @exception Exception if business logic throws an exception
070:             */
071:            public ActionForward execute(ActionMapping mapping,
072:                    ActionForm form, HttpServletRequest request,
073:                    HttpServletResponse response) throws Exception {
074:
075:                // Extract attributes we will need
076:                User user = null;
077:
078:                // Validate the request parameters specified by the user
079:                ActionErrors errors = new ActionErrors();
080:                String username = (String) PropertyUtils.getSimpleProperty(
081:                        form, "username");
082:                String password = (String) PropertyUtils.getSimpleProperty(
083:                        form, "password");
084:                UserDatabase database = (UserDatabase) servlet
085:                        .getServletContext().getAttribute(
086:                                Constants.DATABASE_KEY);
087:                if (database == null)
088:                    errors.add(ActionErrors.GLOBAL_MESSAGE, new ActionMessage(
089:                            "error.database.missing"));
090:                else {
091:                    user = getUser(database, username);
092:                    if ((user != null) && !user.getPassword().equals(password))
093:                        user = null;
094:                    if (user == null)
095:                        errors.add(ActionErrors.GLOBAL_MESSAGE,
096:                                new ActionMessage("error.password.mismatch"));
097:                }
098:
099:                // Report any errors we have discovered back to the original form
100:                if (!errors.isEmpty()) {
101:                    saveErrors(request, errors);
102:                    return (mapping.getInputForward());
103:                }
104:
105:                // Save our logged-in user in the session
106:                HttpSession session = request.getSession();
107:                session.setAttribute(Constants.USER_KEY, user);
108:                if (log.isDebugEnabled()) {
109:                    log.debug("LogonAction: User '" + user.getUsername()
110:                            + "' logged on in session " + session.getId());
111:                }
112:
113:                // Remove the obsolete form bean
114:                if (mapping.getAttribute() != null) {
115:                    if ("request".equals(mapping.getScope()))
116:                        request.removeAttribute(mapping.getAttribute());
117:                    else
118:                        session.removeAttribute(mapping.getAttribute());
119:                }
120:
121:                // Forward control to the specified success URI
122:                return (mapping.findForward("success"));
123:
124:            }
125:
126:            // ------------------------------------------------------ Protected Methods
127:
128:            /**
129:             * Look up the user, throwing an exception to simulate business logic
130:             * rule exceptions.
131:             *
132:             * @param database Database in which to look up the user
133:             * @param username Username specified on the logon form
134:             *
135:             * @exception AppException if a business logic rule is violated
136:             */
137:            public User getUser(UserDatabase database, String username)
138:                    throws ModuleException {
139:
140:                // Force an ArithmeticException which can be handled explicitly
141:                if ("arithmetic".equals(username)) {
142:                    throw new ArithmeticException();
143:                }
144:
145:                // Force an application-specific exception which can be handled
146:                if ("expired".equals(username)) {
147:                    throw new ExpiredPasswordException(username);
148:                }
149:
150:                // Look up and return the specified user
151:                return (database.findUser(username));
152:
153:            }
154:
155:        }
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