content: /*
   * 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.kafka.common.security.oauthbearer.internals;
  
  import org.apache.kafka.common.config.ConfigException;
  import org.apache.kafka.common.security.auth.AuthenticateCallbackHandler;
  import org.apache.kafka.common.security.auth.SaslExtensions;
  import org.apache.kafka.common.security.auth.SaslExtensionsCallback;
  import org.apache.kafka.common.security.oauthbearer.OAuthBearerToken;
  import org.apache.kafka.common.security.oauthbearer.OAuthBearerTokenCallback;
  
  import org.junit.jupiter.api.Test;
  
  import java.nio.charset.StandardCharsets;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import javax.security.auth.callback.Callback;
  import javax.security.auth.callback.UnsupportedCallbackException;
  import javax.security.auth.login.AppConfigurationEntry;
  import javax.security.sasl.SaslException;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.fail;
  
  public class OAuthBearerSaslClientTest {
  
      private static final Map<String, String> TEST_PROPERTIES = new LinkedHashMap<>() {
          {
              put("One", "1");
              put("Two", "2");
              put("Three", "3");
          }
      };
      private SaslExtensions testExtensions = new SaslExtensions(TEST_PROPERTIES);
      private final String errorMessage = "Error as expected!";
  
      public class ExtensionsCallbackHandler implements AuthenticateCallbackHandler {
          private final boolean toThrow;
          private boolean configured = false;
  
          ExtensionsCallbackHandler(boolean toThrow) {
              this.toThrow = toThrow;
          }
  
          public boolean configured() {
              return configured;
          }
  
          @Override
          public void configure(Map<String, ?> configs, String saslMechanism, List<AppConfigurationEntry> jaasConfigEntries) {
              configured = true;
          }
  
          @Override
          public void handle(Callback[] callbacks) throws UnsupportedCallbackException {
              for (Callback callback : callbacks) {
                  if (callback instanceof OAuthBearerTokenCallback)
                      ((OAuthBearerTokenCallback) callback).token(new OAuthBearerToken() {
                          @Override
                          public String value() {
                              return "";
                          }
  
                          @Override
                          public Set<String> scope() {
                              return Collections.emptySet();
                          }
  
                          @Override
                          public long lifetimeMs() {
                              return 100;
                          }
  
                          @Override
                          public String principalName() {
                              return "principalName";
                          }
  
                          @Override
                          public Long startTimeMs() {
                              return null;
                          }
                      });
                  else if (callback instanceof SaslExtensionsCallback) {
                      if (toThrow)
                          throw new ConfigException(errorMessage);
                      else
                          ((SaslExtensionsCallback) callback).extensions(testExtensions);
                  } else
                      throw new UnsupportedCallbackException(callback);
              }
          }
  
          @Override
          public void close() {
          }
      }
  
      @Test
      public void testAttachesExtensionsToFirstClientMessage() throws Exception {
          String expectedToken = new String(new OAuthBearerClientInitialResponse("", testExtensions).toBytes(), StandardCharsets.UTF_8);
  
          OAuthBearerSaslClient client = new OAuthBearerSaslClient(new ExtensionsCallbackHandler(false));
  
          String message = new String(client.evaluateChallenge("".getBytes()), StandardCharsets.UTF_8);
  
          assertEquals(expectedToken, message);
      }
  
      @Test
      public void testNoExtensionsDoesNotAttachAnythingToFirstClientMessage() throws Exception {
          TEST_PROPERTIES.clear();
          testExtensions = new SaslExtensions(TEST_PROPERTIES);
          String expectedToken = new String(new OAuthBearerClientInitialResponse("", new SaslExtensions(TEST_PROPERTIES)).toBytes(), StandardCharsets.UTF_8);
          OAuthBearerSaslClient client = new OAuthBearerSaslClient(new ExtensionsCallbackHandler(false));
  
          String message = new String(client.evaluateChallenge("".getBytes()), StandardCharsets.UTF_8);
  
          assertEquals(expectedToken, message);
      }
  
      @Test
      public void testWrapsExtensionsCallbackHandlingErrorInSaslExceptionInFirstClientMessage() {
          OAuthBearerSaslClient client = new OAuthBearerSaslClient(new ExtensionsCallbackHandler(true));
          try {
              client.evaluateChallenge("".getBytes());
              fail("Should have failed with " + SaslException.class.getName());
          } catch (SaslException e) {
              // assert it has caught our expected exception
              assertEquals(ConfigException.class, e.getCause().getClass());
              assertEquals(errorMessage, e.getCause().getMessage());
          }
  
      }
  }
  