added PortletProcessingFilterEntryPoint for accessing servlet resources via portlet authentication

sandbox/portlet/src/main/java/org/acegisecurity/ui/portlet/PortletProcessingFilterEntryPoint.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2005-2007 the original author or authors.
+ *
+ * Licensed 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.acegisecurity.ui.portlet;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletResponse;
+
+import org.acegisecurity.AuthenticationException;
+import org.acegisecurity.ui.AuthenticationEntryPoint;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.core.Ordered;
+
+/**
+ * <p>In the case of relying on Portlet authentication to access Servlet resources
+ * (such as embedded images or AJAX calls), the authentication should already
+ * be in place by the time the security enforcement takes place.
+ * So, if this class is ever called, then portlet-based authentication has
+ * already failed.  Therefore the <code>commence</code> method in this case will
+ * always return <code>HttpServletResponse.SC_FORBIDDEN</code> (HTTP 403 error).
+ *
+ * @see org.acegisecurity.ui.ExceptionTranslationFilter
+ * @author John A. Lewis
+ * @since 2.0
+ * @version $Id$
+ */
+public class PortletProcessingFilterEntryPoint implements AuthenticationEntryPoint, Ordered {
+
+	//~ Static fields/initializers =====================================================================================
+
+	private static final Log logger = LogFactory.getLog(PortletProcessingFilterEntryPoint.class);
+
+	//~ Instance fields ================================================================================================
+
+	private int order = Integer.MAX_VALUE; // ~ default
+
+	//~ Methods ========================================================================================================
+
+	public int getOrder() {
+		return order;
+	}
+
+	public void setOrder(int order) {
+		this.order = order;
+	}
+
+	public void commence(ServletRequest request, ServletResponse response,
+			AuthenticationException authException) throws IOException, ServletException {
+
+		if (logger.isDebugEnabled())
+			logger.debug("portlet entry point called. Rejecting access");
+
+		HttpServletResponse httpResponse = (HttpServletResponse)response;
+		httpResponse.sendError(HttpServletResponse.SC_FORBIDDEN, "Access Denied");
+	}
+
+}