Java tutorial
/** * The software subject to this notice and license includes both human readable * source code form and machine readable, binary, object code form. The caArray * Software was developed in conjunction with the National Cancer Institute * (NCI) by NCI employees and 5AM Solutions, Inc. (5AM). To the extent * government employees are authors, any rights in such works shall be subject * to Title 17 of the United States Code, section 105. * * This caArray Software License (the License) is between NCI and You. You (or * Your) shall mean a person or an entity, and all other entities that control, * are controlled by, or are under common control with the entity. Control for * purposes of this definition means (i) the direct or indirect power to cause * the direction or management of such entity, whether by contract or otherwise, * or (ii) ownership of fifty percent (50%) or more of the outstanding shares, * or (iii) beneficial ownership of such entity. * * This License is granted provided that You agree to the conditions described * below. NCI grants You a non-exclusive, worldwide, perpetual, fully-paid-up, * no-charge, irrevocable, transferable and royalty-free right and license in * its rights in the caArray Software to (i) use, install, access, operate, * execute, copy, modify, translate, market, publicly display, publicly perform, * and prepare derivative works of the caArray Software; (ii) distribute and * have distributed to and by third parties the caArray Software and any * modifications and derivative works thereof; and (iii) sublicense the * foregoing rights set out in (i) and (ii) to third parties, including the * right to license such rights to further third parties. For sake of clarity, * and not by way of limitation, NCI shall have no right of accounting or right * of payment from You or Your sub-licensees for the rights granted under this * License. This License is granted at no charge to You. * * Your redistributions of the source code for the Software must retain the * above copyright notice, this list of conditions and the disclaimer and * limitation of liability of Article 6, below. Your redistributions in object * code form must reproduce the above copyright notice, this list of conditions * and the disclaimer of Article 6 in the documentation and/or other materials * provided with the distribution, if any. * * Your end-user documentation included with the redistribution, if any, must * include the following acknowledgment: This product includes software * developed by 5AM and the National Cancer Institute. If You do not include * such end-user documentation, You shall include this acknowledgment in the * Software itself, wherever such third-party acknowledgments normally appear. * * You may not use the names "The National Cancer Institute", "NCI", or "5AM" * to endorse or promote products derived from this Software. This License does * not authorize You to use any trademarks, service marks, trade names, logos or * product names of either NCI or 5AM, except as required to comply with the * terms of this License. * * For sake of clarity, and not by way of limitation, You may incorporate this * Software into Your proprietary programs and into any third party proprietary * programs. However, if You incorporate the Software into third party * proprietary programs, You agree that You are solely responsible for obtaining * any permission from such third parties required to incorporate the Software * into such third party proprietary programs and for informing Your * sub-licensees, including without limitation Your end-users, of their * obligation to secure any required permissions from such third parties before * incorporating the Software into such third party proprietary software * programs. In the event that You fail to obtain such permissions, You agree * to indemnify NCI for any claims against NCI by such third parties, except to * the extent prohibited by law, resulting from Your failure to obtain such * permissions. * * For sake of clarity, and not by way of limitation, You may add Your own * copyright statement to Your modifications and to the derivative works, and * You may provide additional or different license terms and conditions in Your * sublicenses of modifications of the Software, or any derivative works of the * Software as a whole, provided Your use, reproduction, and distribution of the * Work otherwise complies with the conditions stated in this License. * * THIS SOFTWARE IS PROVIDED "AS IS," AND ANY EXPRESSED OR IMPLIED WARRANTIES, * (INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, * NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE) ARE DISCLAIMED. IN NO * EVENT SHALL THE NATIONAL CANCER INSTITUTE, 5AM SOLUTIONS, INC. OR THEIR * AFFILIATES 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. */ package com.fiveamsolutions.nci.commons.ejb; import javax.annotation.Resource; import javax.ejb.SessionContext; import javax.interceptor.AroundInvoke; import javax.interceptor.InvocationContext; import org.apache.commons.lang.StringUtils; import com.fiveamsolutions.nci.commons.util.UsernameHolder; /** * Associates the current authenticated user (if any) of remote EJBs with the current session (via UsernameHolder). */ public class AuthorizationInterceptor { @Resource private SessionContext sessionContext; /** * @param sessionContext the session context to set */ public void setSessionContext(SessionContext sessionContext) { this.sessionContext = sessionContext; } /** * Ensures that the current authenticated user is associated with the current session so that security filtering is * correct. * * @param invContext the method context * @return the method result * @throws Exception if invoking the method throws an exception. */ @AroundInvoke @SuppressWarnings("PMD.SignatureDeclareThrowsException") // method invocation wrapper requires throws Exception public Object prepareReturnValue(InvocationContext invContext) throws Exception { final String currentUser = UsernameHolder.getUser(); if (StringUtils.equalsIgnoreCase(UsernameHolder.ANONYMOUS_USERNAME, currentUser)) { String username; try { username = sessionContext.getCallerPrincipal().getName(); } catch (IllegalStateException e) { username = getUnknownUsername(); } UsernameHolder.setUser(username); } try { return invContext.proceed(); } finally { // See PO-6019. Username needs to be cleaned up after the thread is done. UsernameHolder.setUserCaseSensitive(currentUser); } } /** * @return the "unknown" username, extend this class and override this method to change the Unknown username to * something else. */ protected String getUnknownUsername() { return "unknown"; } }