add: added unit test for GssapiCallbackHandler

Author: SML0127

fluss-common/src/test/java/com/alibaba/fluss/security/auth/sasl/gssapi/GssapiServerCallbackHandlerTest.java

@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2024 Alibaba Group Holding Ltd.
+ *
+ *  Licensed 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 com.alibaba.fluss.security.auth.sasl.gssapi;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+
+import javax.security.auth.callback.Callback;
+import javax.security.auth.callback.UnsupportedCallbackException;
+import javax.security.sasl.AuthorizeCallback;
+
+import java.io.IOException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+/** Unit tests for {@link GssapiServerCallbackHandler}. */
+public class GssapiServerCallbackHandlerTest {
+
+    private GssapiServerCallbackHandler handler;
+
+    @BeforeEach
+    public void setUp() {
+        this.handler = new GssapiServerCallbackHandler();
+    }
+
+    @Test
+    public void testSuccessfulAuthorization() throws IOException, UnsupportedCallbackException {
+        String principal = "user-a@FLUSS.COM";
+        AuthorizeCallback cb = new AuthorizeCallback(principal, principal);
+
+        handler.handle(new Callback[] {cb});
+
+        assertThat(cb.isAuthorized()).isTrue();
+        assertThat(cb.getAuthorizedID()).isEqualTo(principal);
+    }
+
+    @Test
+    public void testFailedAuthorizationOnIdMismatch()
+            throws IOException, UnsupportedCallbackException {
+        AuthorizeCallback cb = new AuthorizeCallback("user-a@FLUSS.COM", "user-b@FLUSS.COM");
+
+        handler.handle(new Callback[] {cb});
+        assertThat(cb.isAuthorized()).isFalse();
+    }
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    public void testInvalidAuthenticationIdThrowsException(String invalidAuthenticationId) {
+        AuthorizeCallback cb = new AuthorizeCallback(invalidAuthenticationId, "user-b@FLUSS.COM");
+        assertThatThrownBy(() -> handler.handle(new Callback[] {cb}))
+                .isInstanceOf(IOException.class)
+                .hasMessageContaining("Authentication ID cannot be null or empty");
+    }
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    public void testInvalidAuthorizationIdThrowsException(String invalidAuthorizationId) {
+        AuthorizeCallback cb = new AuthorizeCallback("user-a@FLUSS.com", invalidAuthorizationId);
+        assertThatThrownBy(() -> handler.handle(new Callback[] {cb}))
+                .isInstanceOf(IOException.class)
+                .hasMessageContaining("Authorization ID cannot be null or empty");
+    }
+
+    @Test
+    public void testUnsupportedCallbackThrowsException() {
+        Callback unsupportedCallback = new javax.security.auth.callback.NameCallback("unsupported");
+        assertThatThrownBy(() -> handler.handle(new Callback[] {unsupportedCallback}))
+                .isInstanceOf(UnsupportedCallbackException.class);
+    }
+}