XJDKC commented on code in PR #2759: URL: https://github.com/apache/polaris/pull/2759#discussion_r2411883446
########## runtime/service/src/main/java/org/apache/polaris/service/credentials/DefaultPolarisCredentialManager.java: ########## @@ -0,0 +1,109 @@ +/* + * 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.service.credentials; + +import io.smallrye.common.annotation.Identifier; +import jakarta.annotation.Nonnull; +import jakarta.enterprise.context.RequestScoped; +import jakarta.enterprise.inject.Any; +import jakarta.enterprise.inject.Instance; +import jakarta.inject.Inject; +import org.apache.polaris.core.connection.AuthenticationType; +import org.apache.polaris.core.connection.ConnectionConfigInfoDpo; +import org.apache.polaris.core.context.RealmContext; +import org.apache.polaris.core.credentials.PolarisCredentialManager; +import org.apache.polaris.core.credentials.connection.ConnectionCredentialVendor; +import org.apache.polaris.core.credentials.connection.ConnectionCredentials; +import org.apache.polaris.service.credentials.connection.AuthType; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Default implementation of {@link PolarisCredentialManager} responsible for retrieving credentials + * used by Polaris to access external systems such as remote catalogs or cloud storage. + * + * <p>This implementation delegates to {@link ConnectionCredentialVendor} implementations selected + * via CDI based on the authentication type. Each vendor handles the credential transformation logic + * for a specific authentication mechanism (e.g., SigV4, OAuth). + * + * <p>This bean is request-scoped and realm-aware, delegating all credential generation to + * CDI-managed vendors. + * + * <p>Flow: + * + * <ol> + * <li>Selects the appropriate {@link ConnectionCredentialVendor} based on the authentication type + * <li>Delegates to the vendor to generate the final connection credentials (the vendor will + * resolve the service identity internally) + * </ol> + */ +@RequestScoped +@Identifier("default") +public class DefaultPolarisCredentialManager implements PolarisCredentialManager { + private static final Logger LOGGER = + LoggerFactory.getLogger(DefaultPolarisCredentialManager.class); + + private final RealmContext realmContext; + private final Instance<ConnectionCredentialVendor> credentialVendors; + + @Inject + public DefaultPolarisCredentialManager( + RealmContext realmContext, @Any Instance<ConnectionCredentialVendor> credentialVendors) { + this.realmContext = realmContext; + this.credentialVendors = credentialVendors; + } + + public RealmContext getRealmContext() { + return realmContext; + } + + @Override + public @Nonnull ConnectionCredentials getConnectionCredentials( + @Nonnull ConnectionConfigInfoDpo connectionConfig) { + + // Select the appropriate vendor based on authentication type + AuthenticationType authType = + connectionConfig.getAuthenticationParameters().getAuthenticationType(); + Instance<ConnectionCredentialVendor> selectedVendor = + credentialVendors.select(AuthType.Literal.of(authType)); + + if (selectedVendor.isUnsatisfied()) { + // TODO: Add credential vendors for other authentication types + LOGGER.warn("No connection credential vendor found for authentication type: {}", authType); + return ConnectionCredentials.builder().build(); + } + + if (selectedVendor.isAmbiguous()) { + LOGGER.error( + "Multiple connection credential vendors found for authentication type: {}. " + + "Use @Priority to specify which vendor should be used. " + + "Higher priority values take precedence.", + authType); + throw new IllegalStateException( + String.format( + "Ambiguous connection credential vendor for authentication type: %s. " + + "Multiple implementations found without @Priority annotation.", + authType)); + } + + // Delegate to the vendor to generate credentials + return selectedVendor.get().getConnectionCredentials(connectionConfig); Review Comment: I agree it might look a bit confusing right now since `PolarisCredentialManager` doesn't define additional methods and everything still lives under `ConnectionCredentialVendor`. The main reason I introduced the `PolarisCredentialManager` interface early is to establish a clear separation of concerns before we add `StorageCredentialVendor` and potentially other vendor types. The goal is for `PolarisCredentialManager` to act as the central entry point for all credential management (including caching and multiplexing), while `ConnectionCredentialVendor` represents just one of several possible vendor implementations. i.e., The `PolarisCredentialManager` is also a Connection Credential Vendor. So even though it looks slightly redundant in this PR, it helps set up a cleaner, more extensible structure for the upcoming changes and avoids unnecessary refactoring later. I'm happy to add a short comment or javadoc note to clarify that intent if it helps. I'd prefer to keep `PolarisCredentialManager` implement `ConnectionCredentialVendor` for now. But if you feel strongly about separating it, I can also duplicate the method in `PolarisCredentialManager` and make it a standalone interface. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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