luoyuxia commented on code in PR #1941:
URL: https://github.com/apache/fluss/pull/1941#discussion_r2618607098


##########
fluss-filesystems/fluss-fs-abfs/src/main/java/org/apache/fluss/fs/abfs/AzureFileSystem.java:
##########
@@ -0,0 +1,66 @@
+/*
+ * 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.fluss.fs.abfs;
+
+import org.apache.fluss.fs.FileSystem;
+import org.apache.fluss.fs.abfs.token.AzureDelegationTokenProvider;
+import org.apache.fluss.fs.hdfs.HadoopFileSystem;
+import org.apache.fluss.fs.token.ObtainedSecurityToken;
+
+import org.apache.hadoop.conf.Configuration;
+
+import java.io.IOException;
+
+/**
+ * Implementation of the Fluss {@link FileSystem} interface for Azure Blob 
Storage. This class
+ * implements the common behavior implemented directly by Fluss and delegates 
common calls to an
+ * implementation of Hadoop's filesystem abstraction.
+ */
+public class AzureFileSystem extends HadoopFileSystem {
+
+    private final String scheme;
+    private final Configuration conf;
+
+    private AzureDelegationTokenProvider delegationTokenProvider;

Review Comment:
   ```suggestion
       private volatile AzureDelegationTokenProvider delegationTokenProvider;
   ```



##########
fluss-filesystems/fluss-fs-abfs/src/main/java/org/apache/fluss/fs/abfs/token/AzureDelegationTokenReceiver.java:
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.fluss.fs.abfs.token;
+
+import org.apache.fluss.fs.token.Credentials;
+import org.apache.fluss.fs.token.CredentialsJsonSerde;
+import org.apache.fluss.fs.token.ObtainedSecurityToken;
+import org.apache.fluss.fs.token.SecurityTokenReceiver;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Map;
+
+/** Security token receiver for the abfs filesystem. */
+public class AzureDelegationTokenReceiver implements SecurityTokenReceiver {
+    public static final String PROVIDER_CONFIG_NAME = 
"fs.azure.account.oauth.provider.type";
+
+    private static final Logger LOG = 
LoggerFactory.getLogger(AzureDelegationTokenReceiver.class);
+
+    static volatile Credentials credentials;
+    static volatile Map<String, String> additionInfos;
+
+    public static void updateHadoopConfig(org.apache.hadoop.conf.Configuration 
hadoopConfig) {

Review Comment:
   updateHadoopConfig is never called.



##########
fluss-filesystems/fluss-fs-abfs/src/main/java/org/apache/fluss/fs/abfs/token/AzureDelegationTokenReceiver.java:
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.fluss.fs.abfs.token;
+
+import org.apache.fluss.fs.token.Credentials;
+import org.apache.fluss.fs.token.CredentialsJsonSerde;
+import org.apache.fluss.fs.token.ObtainedSecurityToken;
+import org.apache.fluss.fs.token.SecurityTokenReceiver;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Map;
+
+/** Security token receiver for the abfs filesystem. */
+public class AzureDelegationTokenReceiver implements SecurityTokenReceiver {
+    public static final String PROVIDER_CONFIG_NAME = 
"fs.azure.account.oauth.provider.type";
+
+    private static final Logger LOG = 
LoggerFactory.getLogger(AzureDelegationTokenReceiver.class);
+
+    static volatile Credentials credentials;
+    static volatile Map<String, String> additionInfos;
+
+    public static void updateHadoopConfig(org.apache.hadoop.conf.Configuration 
hadoopConfig) {

Review Comment:
   You can refer `S3FileSystemPlugin` for where to call this method.
   In `S3FileSystemPlugin`, it will check `ACCESS_KEY_ID` set or not.
   - if set, do no thing. will use provide ak/sk
   - if not set, it means the FileSystemPlugin is initialized in client side, 
it will need to get security token from Fluss to access s3. Then it'll call 
`S3DelegationTokenReceiver#updateHadoopConfig` to set the credential provider, 
whose token is from Fluss via method getSecurityToken



##########
fluss-filesystems/fluss-fs-abfs/src/main/java/org/apache/fluss/fs/abfs/token/DynamicTemporaryAzureCredentialsProvider.java:
##########
@@ -0,0 +1,82 @@
+/*
+ * 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.fluss.fs.abfs.token;
+
+import org.apache.fluss.fs.token.Credentials;
+
+import org.apache.hadoop.conf.Configuration;
+import 
org.apache.hadoop.fs.azurebfs.contracts.exceptions.TokenAccessProviderException;
+import org.apache.hadoop.fs.azurebfs.extensions.CustomTokenProviderAdaptee;
+import org.apache.hadoop.fs.azurebfs.oauth2.AccessTokenProvider;
+import org.apache.hadoop.fs.azurebfs.oauth2.AzureADToken;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.Date;
+
+/**
+ * Support dynamic token for authenticating with Azure. Please note that users 
may reference this
+ * class name from configuration property 
fs.azure.account.oauth.provider.type. Therefore, changing
+ * the class name would be a backward-incompatible change. This credential 
provider must not fail in
+ * creation because that will break a chain of credential providers.
+ */
+public class DynamicTemporaryAzureCredentialsProvider extends 
AccessTokenProvider
+        implements CustomTokenProviderAdaptee {
+
+    public static final String NAME = 
DynamicTemporaryAzureCredentialsProvider.class.getName();
+
+    public static final String COMPONENT = "Dynamic session credentials for 
Fluss";
+
+    private volatile AzureADToken azureADToken;

Review Comment:
   Seems azureADToken is not used?



##########
fluss-filesystems/fluss-fs-abfs/src/main/java/org/apache/fluss/fs/abfs/token/AzureDelegationTokenProvider.java:
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.fluss.fs.abfs.token;
+
+import org.apache.fluss.fs.token.CredentialsJsonSerde;
+import org.apache.fluss.fs.token.ObtainedSecurityToken;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.azurebfs.oauth2.AzureADAuthenticator;
+import org.apache.hadoop.fs.azurebfs.oauth2.AzureADToken;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+/** Token provider for abfs Hadoop filesystems. */
+public class AzureDelegationTokenProvider {
+
+    private static final Logger LOG = 
LoggerFactory.getLogger(AzureDelegationTokenProvider.class);
+
+    private static final String CLIENT_ID = 
"fs.azure.account.oauth2.client.id";
+    private static final String CLIENT_SECRET = 
"fs.azure.account.oauth2.client.secret";
+
+    private static final String ENDPOINT_KEY = 
"fs.azure.account.oauth2.client.endpoint";
+
+    private final String scheme;
+    private final String clientId;
+    private final String clientSecret;
+
+    private final String authEndpoint;
+    private final Map<String, String> additionInfos;
+
+    public AzureDelegationTokenProvider(String scheme, Configuration conf) {
+        this.scheme = scheme;
+
+        this.clientId = conf.get(CLIENT_ID);
+        this.clientSecret = conf.get(CLIENT_SECRET);
+        this.authEndpoint = conf.get(ENDPOINT_KEY);
+        this.additionInfos = new HashMap<>();
+
+        for (String key : Arrays.asList(ENDPOINT_KEY)) {

Review Comment:
   ```suggestion
           for (String key : Collections.singleton(ENDPOINT_KEY))
   ```



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