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Subject [GitHub] [hadoop] steveloughran commented on a change in pull request #1858: HDFS-15168: ABFS enhancement to translate AAD Object to Linux idenities
Date Wed, 18 Mar 2020 13:24:43 GMT
steveloughran commented on a change in pull request #1858: HDFS-15168: ABFS enhancement to
translate AAD Object to Linux idenities
URL: https://github.com/apache/hadoop/pull/1858#discussion_r394339436
 
 

 ##########
 File path: hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/utils/TextFileBasedIdentityHandler.java
 ##########
 @@ -0,0 +1,192 @@
+/**
+ * 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.fs.azurebfs.utils;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Strings;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.LineIterator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants.COLON;
+import static org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants.EMPTY_STRING;
+import static org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants.HASH;
+
+
+/**
+ * {@code TextFileBasedIdentityHandler} is a {@link IdentityHandler} implements
+ * translation operation which returns identity mapped to AAD identity by
+ * loading the mapping file from the configured location. Location of the
+ * mapping file should be configured in {@code core-site.xml}
+ *
+ * User identity file should be delimited by colon in below format.
+ * <pre>
+ * OBJ_ID:USER_NAME:USER_ID:GROUP_ID:SPI_NAME:APP_ID
+ * </pre>
+ *
+ * Example:
+ * <pre>
+ * a2b27aec-77bd-46dd-8c8c-39611a333331:user1:11000:21000:spi-user1:abcf86e9-5a5b-49e2-a253-f5c9e2afd4ec
+ * </pre>
+ *
+ * Group identity file should be delimited by colon in below format.
+ * <pre>
+ * OBJ_ID:GROUP_NAME:GROUP_ID:SGP_NAME
+ * </pre>
+ *
+ * Example:
+ * <pre>
+ * 1d23024d-957c-4456-aac1-a57f9e2de914:group1:21000:sgp-group1
+ * </pre>
+ */
+public class TextFileBasedIdentityHandler implements IdentityHandler {
+  private static final Logger LOG = LoggerFactory.getLogger(TextFileBasedIdentityHandler.class);
+
+  /**
+   * Expected no of fields in the user mapping file
+   */
+  private static final int NO_OF_FIELDS_USER_MAPPING = 6;
+  /**
+   * Expected no of fields in the group mapping file
+   */
+  private static final int NO_OF_FIELDS_GROUP_MAPPING = 4;
+  /**
+   * Array index for the local username.
+   * Example:
+   *  a2b27aec-77bd-46dd-8c8c-39611a333331:user1:11000:21000:spi-user1:abcf86e9-5a5b-49e2-a253-f5c9e2afd4ec
+   */
+  private static final int ARRAY_INDEX_FOR_LOCAL_USER_NAME = 1;
+  /**
+   * Array index for the security group name
+   * Example:
+   *  1d23024d-957c-4456-aac1-a57f9e2de914:group1:21000:sgp-group1
+   */
+  private static final int ARRAY_INDEX_FOR_LOCAL_GROUP_NAME = 1;
+  /**
+   * Array index for the AAD Service Principal's Object ID
+   */
+  private static final int ARRAY_INDEX_FOR_AAD_SP_OBJECT_ID = 0;
+  /**
+   * Array index for the AAD Security Group's Object ID
+   */
+  private static final int ARRAY_INDEX_FOR_AAD_SG_OBJECT_ID = 0;
+  private String userMappingFileLocation;
+  private String groupMappingFileLocation;
+  private HashMap<String, String> userMap;
+  private HashMap<String, String> groupMap;
+
+  public TextFileBasedIdentityHandler(String userMappingFilePath, String groupMappingFilePath)
{
+    Preconditions.checkArgument(!Strings.isNullOrEmpty(userMappingFilePath),
+        "Local User to Service Principal mapping filePath cannot by Null or Empty");
+    Preconditions.checkArgument(!Strings.isNullOrEmpty(groupMappingFilePath),
+        "Local Group to Security Group mapping filePath cannot by Null or Empty");
+    this.userMappingFileLocation = userMappingFilePath;
+    this.groupMappingFileLocation = groupMappingFilePath;
+    //Lazy Loading
+    this.userMap = new HashMap<>();
+    this.groupMap = new HashMap<>();
+  }
+
+  /**
+   * Perform lookup from Service Principal's Object ID to Local Username
 
 Review comment:
   nit "."

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