lasdf1234 commented on code in PR #12215:
URL: https://github.com/apache/gravitino/pull/12215#discussion_r3661962720


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common/src/main/java/org/apache/gravitino/secret/memory/InMemorySecretsProvider.java:
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@@ -0,0 +1,77 @@
+/*
+ * 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.gravitino.secret.memory;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import java.util.concurrent.ConcurrentHashMap;
+import org.apache.gravitino.secret.GravitinoSecretProvider;
+import org.apache.gravitino.secret.SecretUrn;
+import org.apache.gravitino.secret.SecretWriteContext;
+
+/**
+ * In-memory secret provider for development and unit tests.
+ *
+ * <p>Secrets are stored in process memory only and are lost on restart. 
Values are Base64-encoded
+ * for opaque storage, which is <strong>not</strong> encryption. Do not use 
this provider in
+ * production.
+ */
+public class InMemorySecretsProvider implements GravitinoSecretProvider {

Review Comment:
   Agreed. Since this provider is intended for development and unit tests only, 
I kept String/Base64 storage and documented that close() clears map references 
but does not securely zero heap contents (String is not wipeable). Production 
providers should use wipeable byte[]/char[] and explicitly zero them on 
delete/close.



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