| /* |
| * $Id$ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.struts.chain.commands; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.struts.chain.contexts.ActionContext; |
| import org.apache.struts.config.ActionConfig; |
| |
| /** |
| * <p>Determine whether the requested action is authorized for the current |
| * user. If not, abort chain processing and perferably, return an error |
| * message of some kind.</p> |
| * |
| * @version $Rev$ $Date: 2005-11-12 13:01:44 -0500 (Sat, 12 Nov 2005) |
| * $ |
| */ |
| public abstract class AbstractAuthorizeAction extends ActionCommandBase { |
| // ------------------------------------------------------ Instance Variables |
| |
| /** |
| * Provide a Commons logging instance for this class. |
| */ |
| private static final Log LOG = |
| LogFactory.getLog(AbstractAuthorizeAction.class); |
| |
| // ---------------------------------------------------------- Public Methods |
| |
| /** |
| * <p>Determine whether the requested action is authorized for the current |
| * user. If not, abort chain processing and perferably, return an error |
| * message of some kind.</p> |
| * |
| * @param actionCtx The <code>Context</code> for the current request |
| * @return <code>false</code> if the user is authorized for the selected |
| * action, else <code>true</code> to abort processing. |
| * @throws UnauthorizedActionException if authorization fails |
| * or if an error is encountered in the course of performing the authorization. |
| */ |
| public boolean execute(ActionContext actionCtx) |
| throws Exception { |
| // Retrieve ActionConfig |
| ActionConfig actionConfig = actionCtx.getActionConfig(); |
| |
| // Is this action protected by role requirements? |
| if (!isAuthorizationRequired(actionConfig)) { |
| return CONTINUE_PROCESSING; |
| } |
| |
| boolean throwEx; |
| |
| try { |
| throwEx = |
| !(isAuthorized(actionCtx, actionConfig.getRoleNames(), |
| actionConfig)); |
| } catch (UnauthorizedActionException ex) { |
| throw ex; |
| } catch (Exception ex) { |
| throwEx = true; |
| LOG.error("Unable to complete authorization process", ex); |
| } |
| |
| if (throwEx) { |
| // The current user is not authorized for this action |
| throw new UnauthorizedActionException(getErrorMessage(actionCtx, |
| actionConfig)); |
| } else { |
| return CONTINUE_PROCESSING; |
| } |
| } |
| |
| /** |
| * <p>Must authorization rules be consulted? The base implementation |
| * returns <code>true</code> if the given <code>ActionConfig</code> has |
| * one or more roles defined.</p> |
| * |
| * @param actionConfig the current ActionConfig object |
| * @return true if the <code>isAuthorized</code> method should be |
| * consulted. |
| */ |
| protected boolean isAuthorizationRequired(ActionConfig actionConfig) { |
| String[] roles = actionConfig.getRoleNames(); |
| |
| return (roles != null) && (roles.length > 0); |
| } |
| |
| // ------------------------------------------------------- Protected Methods |
| |
| /** |
| * <p>Determine if the action is authorized for the given roles.</p> |
| * |
| * @param context The <code>Context</code> for the current request |
| * @param roles An array of valid roles for this request |
| * @param actionConfig The current action mapping |
| * @return <code>true</code> if the request is authorized, else |
| * <code>false</code> |
| * @throws UnauthorizedActionException If the logic determines that the request is not authorized |
| * but does not wish to rely upon the default mechanism reporting the error. |
| * @throws Exception If the action cannot be tested for authorization |
| */ |
| protected abstract boolean isAuthorized(ActionContext context, |
| String[] roles, ActionConfig actionConfig) |
| throws Exception; |
| |
| /** |
| * <p> Retrieve error message from context. </p> |
| * |
| * @param context The <code>Context</code> for the current request |
| * @param actionConfig The current action mapping |
| * @return error message |
| */ |
| protected abstract String getErrorMessage(ActionContext context, |
| ActionConfig actionConfig); |
| } |