difin commented on code in PR #6479:
URL: https://github.com/apache/hive/pull/6479#discussion_r3230053900
##
standalone-metastore/metastore-rest-catalog/src/main/java/org/apache/iceberg/rest/PrivilegeHelper.java:
##
@@ -0,0 +1,142 @@
+/*
+ * 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;
+
+import java.util.Collections;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.ql.metadata.HiveUtils;
+import org.apache.hadoop.hive.ql.security.HiveAuthenticationProvider;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HiveAccessControlException;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HiveAuthzContext;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HiveAuthzSessionContext;
+import org.apache.hadoop.hive.ql.security.authorization.plugin.HiveAuthorizer;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HiveAuthorizerFactory;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HiveMetastoreClientFactoryImpl;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HiveOperationType;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HivePrivilegeObject;
+import
org.apache.hadoop.hive.ql.security.authorization.plugin.HivePrivilegeObject.HivePrivilegeObjectType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Uses the configured HiveAuthorizerFactory to enforce write-access checks at
the REST
+ * catalog layer before any underlying catalog operation is attempted. When no
authorizer is
+ * available the helper logs a warning and fails open (allows the request
through).
+ */
+class PrivilegeHelper {
+ private static final Logger LOG =
LoggerFactory.getLogger(PrivilegeHelper.class);
+
+ private final HiveAuthorizer authorizer;
+ private final HiveAuthzContext authzContext;
+
+ PrivilegeHelper(Configuration conf) {
+HiveAuthorizer auth = null;
+HiveConf hiveConf = (conf instanceof HiveConf) ? (HiveConf) conf
+: new HiveConf(conf, PrivilegeHelper.class);
+try {
+ HiveAuthorizerFactory factory = HiveUtils.getAuthorizerFactory(
+ hiveConf, HiveConf.ConfVars.HIVE_AUTHORIZATION_MANAGER);
+ if (factory != null) {
+HiveAuthzSessionContext.Builder authzContextBuilder = new
HiveAuthzSessionContext.Builder();
+
authzContextBuilder.setClientType(HiveAuthzSessionContext.CLIENT_TYPE.HIVEMETASTORE);
+authzContextBuilder.setSessionString("REST_CATALOG_PrivilegeHelper");
+HiveAuthzSessionContext sessionContext = authzContextBuilder.build();
+
+HiveAuthenticationProvider authenticator = HiveUtils.getAuthenticator(
+hiveConf, HiveConf.ConfVars.HIVE_METASTORE_AUTHENTICATOR_MANAGER);
+if (authenticator != null) {
+ authenticator.setConf(hiveConf);
+}
+
+auth = factory.createHiveAuthorizer(
+new HiveMetastoreClientFactoryImpl(hiveConf), hiveConf,
authenticator, sessionContext);
+LOG.info("PrivilegeHelper initialized with authorizer: {}",
auth.getClass().getName());
+ } else {
+LOG.warn("PrivilegeHelper: no authorizer factory configured;
write-access enforcement is disabled");
+ }
+} catch (Exception e) {
+ LOG.error("PrivilegeHelper: failed to initialize authorizer;
write-access enforcement is disabled", e);
+}
+this.authorizer = auth;
+HiveAuthzContext.Builder builder = new HiveAuthzContext.Builder();
+builder.setCommandString("REST catalog write operation");
+this.authzContext = builder.build();
+ }
+
+ boolean isAvailable() {
Review Comment:
It would be better to change the method name to something more meaningful,
like `isAuthorizerAvailable`.
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