adutra commented on code in PR #18754:
URL: https://github.com/apache/iceberg/pull/18754#discussion_r4511412227


##########
core/src/main/java/org/apache/iceberg/rest/auth/BearerAuthConfig.java:
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@@ -0,0 +1,108 @@
+/*
+ * 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.iceberg.rest.auth;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.time.Duration;
+import java.time.format.DateTimeParseException;
+import java.util.Map;
+import javax.annotation.Nullable;
+import org.apache.iceberg.relocated.com.google.common.base.MoreObjects;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+
+/** Configuration for the {@link BearerAuthManager}. */
+record BearerAuthConfig(
+    @Nullable Path tokenFile, @Nullable Duration reloadInterval, @Nullable 
String token) {
+
+  static final String BEARER_TOKEN = "rest.auth.bearer.token";
+  static final String BEARER_TOKEN_FILE = "rest.auth.bearer.token-file";
+  static final String BEARER_TOKEN_FILE_RELOAD_INTERVAL =
+      "rest.auth.bearer.token-file.reload-interval";
+
+  static final Duration DEFAULT_RELOAD_INTERVAL = Duration.ofMinutes(1);
+  static final Duration MIN_RELOAD_INTERVAL = Duration.ofSeconds(1);
+
+  BearerAuthConfig {
+    Preconditions.checkArgument(
+        tokenFile == null || token == null,
+        "Invalid bearer configuration: token file and static token are 
mutually exclusive");
+    Preconditions.checkArgument(
+        tokenFile != null || token != null,
+        "Invalid bearer configuration: one of token file or static token is 
required");
+    Preconditions.checkArgument(
+        tokenFile == null || reloadInterval != null,
+        "Invalid bearer configuration: reload interval is required when using 
a token file");

Review Comment:
   There is already a default: when 
`rest.auth.bearer.token-file.reload-interval` isn't set, it's 1 minute, and 
users can override it. 
   
   The check here only keeps the record consistent: `fromProperties()` always 
provides both the file and the interval, or none at all.
   
   As for 1 hour vs 1 minute: the interval bounds how long a rotated token can 
go unnoticed, so it needs to be well below the token's lifetime. Kubernetes 
projected tokens can live as little as 10 minutes, so with a 1-hour interval 
we'd keep sending expired tokens.



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