From 3ac0886607db0c8fc85126e8fde8a226d2c9ee4f Mon Sep 17 00:00:00 2001
From: =?utf8?q?Roland=20H=C3=A4der?= <roland@mxchange.org>
Date: Sun, 25 Sep 2022 22:43:26 +0200
Subject: [PATCH] Please cherry-pick: - no need for local variable "isAjax"
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Signed-off-by: Roland Häder <roland@mxchange.org>
---
 .../filter/AddressbookNoCacheFilter.java      | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 src/java/org/mxchange/addressbook/filter/AddressbookNoCacheFilter.java

diff --git a/src/java/org/mxchange/addressbook/filter/AddressbookNoCacheFilter.java b/src/java/org/mxchange/addressbook/filter/AddressbookNoCacheFilter.java
new file mode 100644
index 00000000..5d99053e
--- /dev/null
+++ b/src/java/org/mxchange/addressbook/filter/AddressbookNoCacheFilter.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2022 Free Software Foundation
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.mxchange.addressbook.filter;
+
+import java.io.IOException;
+import javax.faces.application.ResourceHandler;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.annotation.WebFilter;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * A filter for no-caching of JSF requests send from client. This class was
+ * taken from stackoverflow.com at
+ * https://stackoverflow.com/questions/3642919/javax-faces-application-viewexpiredexception-view-could-not-be-restored
+ * and was slightly expanded with "final" keyword and comments
+ * <p>
+ * @author Bauke "BalusC" Scholz<unknown@email.invalid>
+ * @author Roland Häder<roland@mxchange.org>
+ */
+@WebFilter (servletNames = {"Faces Servlet"})
+public class AddressbookNoCacheFilter implements Filter {
+
+	@Override
+	public void destroy () {
+		System.out.println("destroy!"); //NOI18N
+	}
+
+	@Override
+	public void doFilter (final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException {
+		// Cast parameter
+		final HttpServletRequest req = (HttpServletRequest) request;
+		final HttpServletResponse res = (HttpServletResponse) response;
+
+		// Is the request URI not starting with resource identifier?
+		if (!req.getPathInfo().startsWith(ResourceHandler.RESOURCE_IDENTIFIER)) {
+			// Set non-caching header
+			res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); //NOI18N
+			res.setHeader("Pragma", "no-cache"); // //NOI18N
+			res.setDateHeader("Expires", 0); // //NOI18N
+
+			// Is AJAX?
+			if ("true".equals(req.getParameter("javax.faces.partial.ajax"))) {
+				// Set Accept header
+				res.setHeader("Accept", "text/xml"); //NOI18N
+			}
+		}
+
+		// Continue filtering
+		chain.doFilter(request, response);
+	}
+
+	@Override
+	public void init (final FilterConfig filterConfig) throws ServletException {
+		System.out.println("init!"); //NOI18N
+	}
+
+}
-- 
2.39.5