Copilot commented on code in PR #11214:
URL: https://github.com/apache/gravitino/pull/11214#discussion_r3297405041


##########
plugins/idp-basic/src/main/java/org/apache/gravitino/idp/auth/BasicAuthenticator.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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.gravitino.idp.auth;
+
+import com.google.common.base.Preconditions;
+import java.nio.charset.StandardCharsets;
+import java.security.Principal;
+import java.util.Base64;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.gravitino.Config;
+import org.apache.gravitino.UserGroup;
+import org.apache.gravitino.UserPrincipal;
+import org.apache.gravitino.auth.AuthConstants;
+import org.apache.gravitino.exceptions.BadRequestException;
+import org.apache.gravitino.exceptions.UnauthorizedException;
+import org.apache.gravitino.idp.basic.password.PasswordHasher;
+import org.apache.gravitino.idp.basic.password.PasswordHasherFactory;
+import org.apache.gravitino.idp.exception.NotFoundException;
+import org.apache.gravitino.idp.storage.po.IdpUserPO;
+import org.apache.gravitino.idp.storage.service.IdpUserMetaService;
+import org.apache.gravitino.server.authentication.Authenticator;
+
+/** Authenticates HTTP Basic credentials against built-in IdP user metadata. */
+public class BasicAuthenticator implements Authenticator {
+
+  private static final String BASIC_CHALLENGE = 
AuthConstants.AUTHORIZATION_BASIC_HEADER.trim();
+
+  private IdpUserMetaService userMetaService;
+  private PasswordHasher passwordHasher;
+
+  /** Creates a {@link BasicAuthenticator} for reflective loading. */
+  public BasicAuthenticator() {}
+
+  BasicAuthenticator(IdpUserMetaService userMetaService, PasswordHasher 
passwordHasher) {
+    this.userMetaService = userMetaService;
+    this.passwordHasher = passwordHasher;
+  }
+
+  @Override
+  public boolean isDataFromToken() {
+    return true;
+  }
+
+  @Override
+  public Principal authenticateToken(byte[] tokenData) {
+    Preconditions.checkState(
+        userMetaService != null && passwordHasher != null,
+        "Basic authenticator has not been initialized");
+    String authData = requireBasicAuthHeader(tokenData);
+    BasicCredentials credentials = parseBasicCredentials(authData);
+    return authenticate(credentials, authData);
+  }
+
+  @Override
+  public void initialize(Config config) {
+    this.userMetaService = IdpUserMetaService.getInstance();
+    this.passwordHasher = PasswordHasherFactory.create();
+  }
+
+  @Override
+  public boolean supportsToken(byte[] tokenData) {
+    return tokenData != null
+        && new String(tokenData, StandardCharsets.UTF_8)
+            .startsWith(AuthConstants.AUTHORIZATION_BASIC_HEADER);
+  }
+
+  private String requireBasicAuthHeader(byte[] tokenData) {
+    if (tokenData == null) {
+      throw unauthorized("Empty token authorization header");
+    }
+
+    String authData = new String(tokenData, StandardCharsets.UTF_8);
+    if (authData.trim().isEmpty()) {
+      throw unauthorized("Empty token authorization header");
+    }
+    if (!authData.startsWith(AuthConstants.AUTHORIZATION_BASIC_HEADER)) {
+      throw unauthorized("Invalid token authorization header");
+    }

Review Comment:
   The HTTP auth scheme name is case-insensitive (e.g., `basic`, `BASIC` should 
be treated the same as `Basic`). The current `startsWith(...)` checks are 
case-sensitive, which can incorrectly reject valid requests. Consider 
implementing a case-insensitive scheme check (without lowercasing the entire 
header if you want to preserve the credential bytes), and add a unit test that 
verifies `supportsToken` / `authenticateToken` accept a different-cased `Basic` 
scheme.



##########
plugins/idp-basic/src/main/java/org/apache/gravitino/idp/auth/BasicAuthenticator.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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.gravitino.idp.auth;
+
+import com.google.common.base.Preconditions;
+import java.nio.charset.StandardCharsets;
+import java.security.Principal;
+import java.util.Base64;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.gravitino.Config;
+import org.apache.gravitino.UserGroup;
+import org.apache.gravitino.UserPrincipal;
+import org.apache.gravitino.auth.AuthConstants;
+import org.apache.gravitino.exceptions.BadRequestException;
+import org.apache.gravitino.exceptions.UnauthorizedException;
+import org.apache.gravitino.idp.basic.password.PasswordHasher;
+import org.apache.gravitino.idp.basic.password.PasswordHasherFactory;
+import org.apache.gravitino.idp.exception.NotFoundException;
+import org.apache.gravitino.idp.storage.po.IdpUserPO;
+import org.apache.gravitino.idp.storage.service.IdpUserMetaService;
+import org.apache.gravitino.server.authentication.Authenticator;
+
+/** Authenticates HTTP Basic credentials against built-in IdP user metadata. */
+public class BasicAuthenticator implements Authenticator {
+
+  private static final String BASIC_CHALLENGE = 
AuthConstants.AUTHORIZATION_BASIC_HEADER.trim();
+
+  private IdpUserMetaService userMetaService;
+  private PasswordHasher passwordHasher;
+
+  /** Creates a {@link BasicAuthenticator} for reflective loading. */
+  public BasicAuthenticator() {}
+
+  BasicAuthenticator(IdpUserMetaService userMetaService, PasswordHasher 
passwordHasher) {
+    this.userMetaService = userMetaService;
+    this.passwordHasher = passwordHasher;
+  }
+
+  @Override
+  public boolean isDataFromToken() {
+    return true;
+  }
+
+  @Override
+  public Principal authenticateToken(byte[] tokenData) {
+    Preconditions.checkState(
+        userMetaService != null && passwordHasher != null,
+        "Basic authenticator has not been initialized");
+    String authData = requireBasicAuthHeader(tokenData);
+    BasicCredentials credentials = parseBasicCredentials(authData);
+    return authenticate(credentials, authData);
+  }
+
+  @Override
+  public void initialize(Config config) {
+    this.userMetaService = IdpUserMetaService.getInstance();
+    this.passwordHasher = PasswordHasherFactory.create();
+  }
+
+  @Override
+  public boolean supportsToken(byte[] tokenData) {
+    return tokenData != null
+        && new String(tokenData, StandardCharsets.UTF_8)
+            .startsWith(AuthConstants.AUTHORIZATION_BASIC_HEADER);
+  }

Review Comment:
   The HTTP auth scheme name is case-insensitive (e.g., `basic`, `BASIC` should 
be treated the same as `Basic`). The current `startsWith(...)` checks are 
case-sensitive, which can incorrectly reject valid requests. Consider 
implementing a case-insensitive scheme check (without lowercasing the entire 
header if you want to preserve the credential bytes), and add a unit test that 
verifies `supportsToken` / `authenticateToken` accept a different-cased `Basic` 
scheme.



##########
plugins/idp-basic/src/main/java/org/apache/gravitino/idp/auth/BasicAuthenticator.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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.gravitino.idp.auth;
+
+import com.google.common.base.Preconditions;
+import java.nio.charset.StandardCharsets;
+import java.security.Principal;
+import java.util.Base64;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.gravitino.Config;
+import org.apache.gravitino.UserGroup;
+import org.apache.gravitino.UserPrincipal;
+import org.apache.gravitino.auth.AuthConstants;
+import org.apache.gravitino.exceptions.BadRequestException;
+import org.apache.gravitino.exceptions.UnauthorizedException;
+import org.apache.gravitino.idp.basic.password.PasswordHasher;
+import org.apache.gravitino.idp.basic.password.PasswordHasherFactory;
+import org.apache.gravitino.idp.exception.NotFoundException;
+import org.apache.gravitino.idp.storage.po.IdpUserPO;
+import org.apache.gravitino.idp.storage.service.IdpUserMetaService;
+import org.apache.gravitino.server.authentication.Authenticator;
+
+/** Authenticates HTTP Basic credentials against built-in IdP user metadata. */
+public class BasicAuthenticator implements Authenticator {
+
+  private static final String BASIC_CHALLENGE = 
AuthConstants.AUTHORIZATION_BASIC_HEADER.trim();
+
+  private IdpUserMetaService userMetaService;
+  private PasswordHasher passwordHasher;
+
+  /** Creates a {@link BasicAuthenticator} for reflective loading. */
+  public BasicAuthenticator() {}
+
+  BasicAuthenticator(IdpUserMetaService userMetaService, PasswordHasher 
passwordHasher) {
+    this.userMetaService = userMetaService;
+    this.passwordHasher = passwordHasher;
+  }
+
+  @Override
+  public boolean isDataFromToken() {
+    return true;
+  }
+
+  @Override
+  public Principal authenticateToken(byte[] tokenData) {
+    Preconditions.checkState(
+        userMetaService != null && passwordHasher != null,
+        "Basic authenticator has not been initialized");
+    String authData = requireBasicAuthHeader(tokenData);
+    BasicCredentials credentials = parseBasicCredentials(authData);
+    return authenticate(credentials, authData);
+  }
+
+  @Override
+  public void initialize(Config config) {
+    this.userMetaService = IdpUserMetaService.getInstance();
+    this.passwordHasher = PasswordHasherFactory.create();
+  }
+
+  @Override
+  public boolean supportsToken(byte[] tokenData) {
+    return tokenData != null
+        && new String(tokenData, StandardCharsets.UTF_8)
+            .startsWith(AuthConstants.AUTHORIZATION_BASIC_HEADER);
+  }
+
+  private String requireBasicAuthHeader(byte[] tokenData) {
+    if (tokenData == null) {
+      throw unauthorized("Empty token authorization header");
+    }
+
+    String authData = new String(tokenData, StandardCharsets.UTF_8);
+    if (authData.trim().isEmpty()) {
+      throw unauthorized("Empty token authorization header");
+    }
+    if (!authData.startsWith(AuthConstants.AUTHORIZATION_BASIC_HEADER)) {
+      throw unauthorized("Invalid token authorization header");
+    }
+    return authData;
+  }
+
+  private BasicCredentials parseBasicCredentials(String authData) {
+    String credential = 
authData.substring(AuthConstants.AUTHORIZATION_BASIC_HEADER.length());
+    credential = credential.trim();
+    if (credential.isEmpty()) {
+      throw new BadRequestException("Malformed Basic authorization header: 
missing credentials");
+    }
+
+    try {
+      String decodedCredential =
+          new String(Base64.getDecoder().decode(credential), 
StandardCharsets.UTF_8);
+      int separatorIndex = decodedCredential.indexOf(':');
+      if (separatorIndex < 0) {
+        throw new BadRequestException(
+            "Malformed Basic authorization header: credentials must be in 
username:password format");
+      }
+
+      String userName = decodedCredential.substring(0, separatorIndex);
+      if (userName.isEmpty()) {
+        throw new BadRequestException(
+            "Malformed Basic authorization header: username must not be 
empty");
+      }
+
+      String password = decodedCredential.substring(separatorIndex + 1);
+      if (StringUtils.isBlank(password)) {
+        throw invalidCredentials();
+      }
+      return new BasicCredentials(userName, password);
+    } catch (IllegalArgumentException e) {
+      throw new BadRequestException(e, "Malformed Basic authorization header: 
invalid base64");
+    }
+  }
+
+  private UserPrincipal authenticate(BasicCredentials credentials, String 
authData) {
+    IdpUserPO userPO = loadUser(credentials.userName());
+    if (!passwordHasher.verify(credentials.password(), 
userPO.getPasswordHash())) {
+      throw invalidCredentials();
+    }
+
+    List<UserGroup> groups =
+        
userMetaService.listGroupNamesByUsername(credentials.userName()).stream()
+            .map(groupName -> new UserGroup(Optional.empty(), groupName))
+            .collect(Collectors.toList());
+    return new UserPrincipal(credentials.userName(), groups, authData);

Review Comment:
   Returning a `UserPrincipal` that stores the raw `Authorization: Basic ...` 
header as the access token leaks user passwords (Base64-decoded) to any 
downstream logging/serialization/auditing that includes `accessToken`. Basic 
auth credentials should not be retained after authentication. Consider omitting 
the access token for BASIC (e.g., pass `null`/empty token depending on the 
available `UserPrincipal` constructors) or storing only a non-sensitive marker 
(like the scheme name) instead, and update the tests that currently assert the 
header is preserved.



##########
server-common/src/main/java/org/apache/gravitino/server/authentication/AuthenticatorFactory.java:
##########
@@ -40,7 +40,9 @@ public class AuthenticatorFactory {
           AuthenticatorType.OAUTH.name().toLowerCase(),
           OAuth2TokenAuthenticator.class.getCanonicalName(),
           AuthenticatorType.KERBEROS.name().toLowerCase(),
-          KerberosAuthenticator.class.getCanonicalName());
+          KerberosAuthenticator.class.getCanonicalName(),
+          AuthenticatorType.BASIC.name().toLowerCase(),
+          "org.apache.gravitino.idp.auth.BasicAuthenticator");

Review Comment:
   The BASIC authenticator is registered using a hard-coded FQCN string, unlike 
the other entries that use `Class.getCanonicalName()`. This is brittle during 
refactors (package/class rename won’t be caught by the compiler). If a direct 
dependency isn’t possible here, consider centralizing the class name in a 
shared constant (or in `AuthenticatorType` metadata) to avoid string 
duplication/typos and make updates safer.



##########
plugins/idp-basic/build.gradle.kts:
##########
@@ -26,6 +26,8 @@ plugins {
 dependencies {
   annotationProcessor(libs.lombok)
 
+  compileOnly(project(":api"))
+  compileOnly(project(":server-common"))

Review Comment:
   Declaring `:api` and `:server-common` as `compileOnly` means consumers that 
depend on the `idp-basic` artifact alone will not get these at runtime, which 
can lead to `ClassNotFoundException`/`NoClassDefFoundError` when loading 
`BasicAuthenticator` (it references types like `Authenticator`, `Config`, 
`UserPrincipal`, etc.). If the plugin is meant to be usable as a standalone 
dependency, consider switching these to `implementation`/`api`, or adding 
corresponding `runtimeOnly` constraints and documenting that these are required 
runtime dependencies.



##########
server-common/src/test/java/org/apache/gravitino/server/authentication/TestBasicAuthentication.java:
##########
@@ -0,0 +1,207 @@
+/*
+ * 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.gravitino.server.authentication;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import com.google.common.collect.Lists;
+import java.lang.reflect.Constructor;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.Collections;
+import java.util.List;
+import java.util.Vector;
+import javax.servlet.FilterChain;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.apache.gravitino.UserPrincipal;
+import org.apache.gravitino.auth.AuthConstants;
+import org.apache.gravitino.exceptions.BadRequestException;
+import org.apache.gravitino.exceptions.UnauthorizedException;
+import org.apache.gravitino.idp.auth.BasicAuthenticator;
+import org.apache.gravitino.idp.basic.password.PasswordHasher;
+import org.apache.gravitino.idp.exception.NotFoundException;
+import org.apache.gravitino.idp.storage.po.IdpUserPO;
+import org.apache.gravitino.idp.storage.service.IdpUserMetaService;
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+
+public class TestBasicAuthentication {
+
+  private static final String USER = "alice";
+  private static final String PASSWORD = "Passw0rd-For-Alice";
+  private static final String PASSWORD_HASH = "hash-1";
+
+  @Test
+  public void testSupportsBasic() throws Exception {
+    BasicAuthenticator authenticator = authenticator();
+
+    assertTrue(authenticator.supportsToken(basicAuthBytes(USER, PASSWORD)));
+    assertFalse(authenticator.supportsToken("Bearer 
token".getBytes(StandardCharsets.UTF_8)));
+    assertFalse(authenticator.supportsToken(null));
+  }
+
+  @Test
+  public void testValidCredentials() throws Exception {
+    BasicAuthenticator authenticator =
+        aliceAuthenticator(true, Arrays.asList("group-a", "group-b"));
+    String authHeader = basicAuthHeader(USER, PASSWORD);
+
+    UserPrincipal principal =
+        (UserPrincipal) 
authenticator.authenticateToken(basicAuthBytes(authHeader));
+
+    assertEquals(USER, principal.getName());
+    assertEquals(authHeader, principal.getAccessToken().orElse(null));

Review Comment:
   This test asserts that the `UserPrincipal` retains the full Basic 
Authorization header as an access token, which includes password-equivalent 
material. If you address the credential-retention issue in 
`BasicAuthenticator`, this assertion should be updated to expect an 
empty/redacted token to prevent accidental propagation of secrets.



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