PhillHenry commented on code in PR #3729:
URL: https://github.com/apache/polaris/pull/3729#discussion_r2793839737


##########
polaris-core/src/main/java/org/apache/polaris/core/connection/GcpAuthenticationParametersDpo.java:
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@@ -0,0 +1,113 @@
+/*
+ * 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.core.connection;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import jakarta.annotation.Nonnull;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import org.apache.iceberg.CatalogProperties;
+import org.apache.iceberg.rest.auth.AuthProperties;
+import org.apache.polaris.core.admin.model.AuthenticationParameters;
+import org.apache.polaris.core.admin.model.GoogleAuthenticationParameters;
+import org.apache.polaris.core.credentials.PolarisCredentialManager;
+
+/**
+ * See {@link org.apache.iceberg.rest.RESTUtil#configHeaders(Map)} and {@link
+ * org.apache.iceberg.rest.auth.AuthManagers#loadAuthManager(String, Map)} for 
why we do this.
+ */
+public class GoogleAuthenticationParametersDpo extends 
AuthenticationParametersDpo {
+  private final String clientId;
+  private final String quotaProject;
+  private final String remoteWarehouseName;
+
+  public GoogleAuthenticationParametersDpo(
+      @JsonProperty(value = "clientId", required = true) @Nonnull String 
clientId,
+      @JsonProperty(value = "quotaProject", required = true) @Nonnull String 
quotaProject,
+      @JsonProperty(value = "remoteWarehouseName", required = true) @Nonnull
+          String remoteWarehouseName) {
+    super(AuthenticationType.GOOGLE.getCode());
+    this.clientId = clientId;
+    this.quotaProject = quotaProject;
+    this.remoteWarehouseName = remoteWarehouseName;
+  }
+
+  @Nonnull
+  @Override
+  public Map<String, String> asIcebergCatalogProperties(
+      PolarisCredentialManager credentialManager) {
+    HashMap<String, String> properties = new HashMap<>();
+    properties.put("header.x-goog-user-project", getQuotaProject());
+    properties.put("header.X-Iceberg-Access-Delegation", "vended-credentials");

Review Comment:
   Yes, that message is I believe from contacting a GCP endpoint. 
   
   Shall I add a field to the new GcpAuthenticationParameters DTO to capture 
which CredentialMode value to use?
   
   My own personal BigLake endpoint is configured for 
CREDENTIAL_MODE_VENDED_CREDENTIALS_VALUE (hence the need for 
vended-credentials) even though the code uses the paradigm associated with 
CREDENTIAL_MODE_END_USER_VALUE. I anticipate another PR to implement the 
CREDENTIAL_MODE_VENDED_CREDENTIALS_VALUE paradigm.



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