adutra commented on code in PR #15703:
URL: https://github.com/apache/iceberg/pull/15703#discussion_r3153118459


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core/src/main/java/org/apache/iceberg/rest/auth/oauth2/config/BasicConfig.java:
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@@ -0,0 +1,284 @@
+/*
+ * 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.oauth2.config;
+
+import com.nimbusds.oauth2.sdk.GrantType;
+import com.nimbusds.oauth2.sdk.Scope;
+import com.nimbusds.oauth2.sdk.auth.ClientAuthenticationMethod;
+import com.nimbusds.oauth2.sdk.auth.Secret;
+import com.nimbusds.oauth2.sdk.id.ClientID;
+import com.nimbusds.oauth2.sdk.token.AccessToken;
+import com.nimbusds.oauth2.sdk.token.BearerAccessToken;
+import java.net.URI;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import org.apache.iceberg.rest.RESTUtil;
+import org.apache.iceberg.rest.auth.oauth2.OAuth2Config;
+import org.immutables.value.Value;
+
+/**
+ * Basic OAuth2 properties. These properties are used to configure the basic 
OAuth2 options such as
+ * the issuer URL, token endpoint, client ID, and client secret.
+ */
[email protected]
[email protected](redactedMask = "****")
+@SuppressWarnings({"ImmutablesStyle", "SafeLoggingPropagation"})
+public interface BasicConfig {
+
+  String PREFIX = OAuth2Config.PREFIX;
+
+  String TOKEN = PREFIX + "token";
+  String ISSUER_URL = PREFIX + "issuer-url";
+  String TOKEN_ENDPOINT = PREFIX + "token-endpoint";
+  String GRANT_TYPE = PREFIX + "grant-type";
+  String CLIENT_ID = PREFIX + "client-id";
+  String CLIENT_AUTH = PREFIX + "client-auth";
+  String CLIENT_SECRET = PREFIX + "client-secret";
+  String SCOPE = PREFIX + "scope";
+  String EXTRA_PARAMS = PREFIX + "extra-params";
+  String SESSION_CACHE_TIMEOUT = PREFIX + "session-cache.timeout";
+
+  GrantType DEFAULT_GRANT_TYPE = GrantType.CLIENT_CREDENTIALS;
+  ClientAuthenticationMethod DEFAULT_CLIENT_AUTH = 
ClientAuthenticationMethod.CLIENT_SECRET_BASIC;
+  Duration DEFAULT_SESSION_CACHE_TIMEOUT = Duration.parse("PT1H");
+
+  /**
+   * The initial access token to use. Optional. If this is set, the OAuth2 
client will not attempt
+   * to fetch an initial token from the Authorization server, but will use 
this token instead.
+   *
+   * <p>This option should be avoided as in most cases, the token cannot be 
refreshed.

Review Comment:
   See my answer to your other comment. 
   
   In an ideal world, there should be no reason to pass an access token "as is" 
to the catalog. 
   
   You would instead either:
   
   1. Let the catalog fetch the token for you; or
   2. Exchange an external token for a new token, using the token exchange 
grant.
   
   Passing a raw access token effectively beats the purpose of using OAuth2, 
and in most cases, the token cannot be refreshed.
   
   This option only exists to "bridge the gap" until everyone is able to use 
OAuth2 optimally. 



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