[GitHub] [hbase] anmolnar commented on a change in pull request #3934: HBASE-26553 OAuth Bearer authentication mech plugin for SASL

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anmolnar commented on a change in pull request #3934:
URL: https://github.com/apache/hbase/pull/3934#discussion_r778079579



##########
File path: hbase-common/src/main/java/org/apache/hadoop/hbase/security/oauthbearer/OAuthBearerTokenCallback.java
##########
@@ -0,0 +1,122 @@
+/*
+ * 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.hadoop.hbase.security.oauthbearer;
+
+import java.util.Objects;
+import javax.security.auth.callback.Callback;
+import org.apache.yetus.audience.InterfaceAudience;
+
+/**
+ * A {@code Callback} for use by the {@code SaslClient} and {@code Login}
+ * implementations when they require an OAuth 2 bearer token. Callback handlers
+ * should use the {@link #error(String, String, String)} method to communicate
+ * errors returned by the authorization server as per
+ * <a href="https://tools.ietf.org/html/rfc6749#section-5.2">RFC 6749: The OAuth
+ * 2.0 Authorization Framework</a>. Callback handlers should communicate other
+ * problems by raising an {@code IOException}.
+ * <p>
+ * This class was introduced in 2.0.0 and, while it feels stable, it could

Review comment:
       Copied from Kafka, so yes, this should be 3.0.0 for HBase.




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