t-rana commented on code in PR #1545:
URL: https://github.com/apache/jackrabbit-oak/pull/1545#discussion_r1687920075


##########
oak-segment-azure/src/main/java/org/apache/jackrabbit/oak/segment/azure/AzureStorageCredentialManager.java:
##########
@@ -0,0 +1,146 @@
+/*
+ * 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.jackrabbit.oak.segment.azure;
+
+import com.azure.core.credential.AccessToken;
+import com.azure.core.credential.TokenRequestContext;
+import com.azure.identity.ClientSecretCredential;
+import com.azure.identity.ClientSecretCredentialBuilder;
+import com.microsoft.azure.storage.StorageCredentials;
+import com.microsoft.azure.storage.StorageCredentialsAccountAndKey;
+import com.microsoft.azure.storage.StorageCredentialsToken;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.jackrabbit.oak.commons.concurrent.ExecutorCloser;
+import org.apache.jackrabbit.oak.segment.azure.util.Environment;
+import org.jetbrains.annotations.NotNull;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.time.LocalDateTime;
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.Objects;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import static 
org.apache.jackrabbit.oak.segment.azure.AzureUtilities.AZURE_CLIENT_ID;
+import static 
org.apache.jackrabbit.oak.segment.azure.AzureUtilities.AZURE_CLIENT_SECRET;
+import static 
org.apache.jackrabbit.oak.segment.azure.AzureUtilities.AZURE_SECRET_KEY;
+import static 
org.apache.jackrabbit.oak.segment.azure.AzureUtilities.AZURE_TENANT_ID;
+
+public class AzureStorageCredentialManager implements Closeable {
+    private static final Logger log = 
LoggerFactory.getLogger(AzureStorageCredentialManager.class);
+    private static final String AZURE_DEFAULT_SCOPE = 
"https://storage.azure.com/.default";;
+    private static final long TOKEN_REFRESHER_INITIAL_DELAY = 45L;
+    private static final long TOKEN_REFRESHER_DELAY = 1L;
+    private ClientSecretCredential clientSecretCredential;
+    private AccessToken accessToken;
+    private StorageCredentialsToken storageCredentialsToken;
+    private final ScheduledExecutorService executorService = 
Executors.newSingleThreadScheduledExecutor();
+
+    public StorageCredentials getStorageCredentialsFromEnvironment(@NotNull 
String accountName, @NotNull Environment environment) {
+        final String clientId = environment.getVariable(AZURE_CLIENT_ID);
+        final String clientSecret = 
environment.getVariable(AZURE_CLIENT_SECRET);
+        final String tenantId = environment.getVariable(AZURE_TENANT_ID);
+
+        if (StringUtils.isNoneBlank(clientId, clientSecret, tenantId)) {
+            try {
+                return 
getStorageCredentialAccessTokenFromServicePrincipals(accountName, clientId, 
clientSecret, tenantId);
+            } catch (IllegalArgumentException | 
StringIndexOutOfBoundsException e) {
+                throw new IllegalArgumentException(
+                        "Could not connect to the Azure Storage. Please verify 
if AZURE_CLIENT_ID, AZURE_CLIENT_SECRET and AZURE_TENANT_ID environment 
variables are correctly set!");

Review Comment:
   Done



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