lukaszlenart commented on code in PR #832:
URL: https://github.com/apache/struts/pull/832#discussion_r1458402394


##########
apps/showcase/src/main/java/org/apache/struts2/showcase/action/ParamsAnnotationAction.java:
##########
@@ -0,0 +1,133 @@
+/*
+ * 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.struts2.showcase.action;
+
+import com.opensymphony.xwork2.ActionSupport;
+import org.apache.struts2.interceptor.parameter.StrutsParameter;
+import org.apache.struts2.showcase.model.MyDto;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static java.util.Collections.singletonList;
+import static java.util.Collections.singletonMap;
+
+/**
+ * This class supports {@link 
com.atlassian.confluence.stateless.webdriver.selenium3.security.StrutsParametersTest}
+ * which prevents critical security regressions. Do NOT modify without 
understanding the motivation behind the tests and
+ * the implications of any changes.
+ */
+public class ParamsAnnotationAction extends ActionSupport {
+
+    @StrutsParameter

Review Comment:
   Oh nice, I was going to ask about that, so this mechanism supports injecting 
incoming values directly into fields without a need to define setter, is that 
right? What about getter to fetch the value, is it still needed?



##########
core/src/main/java/org/apache/struts2/ognl/ThreadAllowlist.java:
##########
@@ -0,0 +1,51 @@
+/*
+ * 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.struts2.ognl;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static java.util.Collections.emptySet;
+import static java.util.Collections.unmodifiableSet;
+
+/**
+ * Allows any bean to allowlist a class for use in OGNL expressions, for the 
current thread only. The allowlist can be
+ * cleared once any desired OGNL expressions have been evaluated.
+ *
+ * @since 6.4.0
+ */
+public class ThreadAllowlist {
+
+    private final ThreadLocal<Set<Class<?>>> allowlist = new ThreadLocal<>();

Review Comment:
   Why do you use ThreadLocal? Wouldn't be better to use one global cache for 
the whole app?



##########
core/src/main/java/com/opensymphony/xwork2/config/impl/DefaultConfiguration.java:
##########
@@ -395,6 +396,7 @@ public static ContainerBuilder 
bootstrapFactories(ContainerBuilder builder) {
                 .factory(SecurityMemberAccess.class, Scope.PROTOTYPE)
                 .factory(OgnlGuard.class, StrutsOgnlGuard.class, 
Scope.SINGLETON)
                 .factory(ProviderAllowlist.class, Scope.SINGLETON)
+                .factory(ThreadAllowlist.class, Scope.SINGLETON)

Review Comment:
   Wouldn't be better to use `PROTOTYPE` scope and do not use ThreadLocal 
instead?



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