mneethiraj commented on code in PR #3928:
URL: https://github.com/apache/polaris/pull/3928#discussion_r2892668163


##########
extensions/auth/ranger/src/main/java/org/apache/polaris/extension/auth/ranger/RangerPolarisAuthorizer.java:
##########
@@ -0,0 +1,449 @@
+/*
+ * 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.polaris.extension.auth.ranger;
+
+import static 
org.apache.polaris.core.entity.PolarisEntityConstants.getRootPrincipalName;
+
+import com.google.common.base.Preconditions;
+import jakarta.annotation.Nonnull;
+import jakarta.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Properties;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.apache.iceberg.exceptions.ForbiddenException;
+import org.apache.polaris.core.auth.AuthorizationDecision;
+import org.apache.polaris.core.auth.AuthorizationRequest;
+import org.apache.polaris.core.auth.AuthorizationState;
+import org.apache.polaris.core.auth.PolarisAuthorizableOperation;
+import org.apache.polaris.core.auth.PolarisAuthorizer;
+import org.apache.polaris.core.auth.PolarisPrincipal;
+import org.apache.polaris.core.config.FeatureConfiguration;
+import org.apache.polaris.core.config.RealmConfig;
+import org.apache.polaris.core.entity.PolarisBaseEntity;
+import org.apache.polaris.core.entity.PolarisEntityConstants;
+import org.apache.polaris.core.persistence.PolarisResolvedPathWrapper;
+import org.apache.polaris.extension.auth.ranger.utils.RangerUtils;
+import org.apache.ranger.authz.api.RangerAuthorizer;
+import org.apache.ranger.authz.api.RangerAuthzException;
+import org.apache.ranger.authz.embedded.RangerEmbeddedAuthorizer;
+import org.apache.ranger.authz.model.RangerAccessContext;
+import org.apache.ranger.authz.model.RangerAccessInfo;
+import org.apache.ranger.authz.model.RangerAuthzResult;
+import org.apache.ranger.authz.model.RangerMultiAuthzRequest;
+import org.apache.ranger.authz.model.RangerMultiAuthzResult;
+import org.apache.ranger.authz.model.RangerUserInfo;
+import org.jspecify.annotations.NonNull;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/** Authorizes operations based on policies defined in Apache Ranger. */
+public class RangerPolarisAuthorizer implements PolarisAuthorizer {
+  private static final Logger LOG = 
LoggerFactory.getLogger(RangerPolarisAuthorizer.class);
+
+  public static final String SERVICE_TYPE = "polaris";
+  public static final String SERVICE_NAME_PROPERTY = 
"ranger.plugin.polaris.service.name";
+
+  private static final String OPERATION_NOT_ALLOWED_FOR_USER_ERROR =
+      "Principal '%s' is not authorized for op %s due to 
PRINCIPAL_CREDENTIAL_ROTATION_REQUIRED_STATE";
+  private static final String ROOT_PRINCIPLE_NEEDED_ERROR =
+      "Principal '%s' is not authorized for op %s as only root principal can 
perform this operation";
+  private static final String RANGER_AUTH_FAILED_ERROR =
+      "Principal '%s' is not authorized for op '%s'";
+  private static final String RANGER_UNSUPPORTED_OPERATION =
+      "Operation %s is not supported by Ranger authorizer";
+
+  private static final Set<PolarisAuthorizableOperation> AUTHORIZED_OPERATIONS 
=
+      initAuthorizedOperations();
+
+  private final RealmConfig realmConfig;
+  private final RangerAuthorizer authorizer;
+  private final String serviceName;
+
+  public RangerPolarisAuthorizer(RangerPolarisAuthorizerConfig config, 
RealmConfig realmConfig) {
+    LOG.info("Initializing RangerPolarisAuthorizer");
+
+    Properties rangerProp = 
RangerUtils.loadProperties(config.configFileName().get());
+
+    this.realmConfig = realmConfig;
+    this.authorizer = new RangerEmbeddedAuthorizer(rangerProp);
+    this.serviceName = rangerProp.getProperty(SERVICE_NAME_PROPERTY);
+
+    try {
+      authorizer.init();
+    } catch (RangerAuthzException t) {
+      LOG.error("Failed to initialize RangerPolarisAuthorizer", t);
+      throw new RuntimeException(t);
+    }
+
+    LOG.info("RangerPolarisAuthorizer initialized successfully");
+  }
+
+  @Override
+  public void resolveAuthorizationInputs(
+      @NonNull AuthorizationState authzState, @NonNull AuthorizationRequest 
request) {
+    throw new UnsupportedOperationException(
+        "resolveAuthorizationInputs is not implemented yet for 
RangerPolarisAuthorizer");
+  }
+
+  @Override
+  public @NonNull AuthorizationDecision authorize(
+      @NonNull AuthorizationState authzState, @NonNull AuthorizationRequest 
request) {
+    throw new UnsupportedOperationException(
+        "authorize is not implemented yet for RangerPolarisAuthorizer");
+  }

Review Comment:
   Refactoring of authorizer SPI is in progress, tracked by a separate PR 
#3779. The suggestion is to update authorizer implementations once the 
refactoring is complete.



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