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.security.auth.SaslExtensions;
  
  import org.junit.jupiter.api.Test;
  
  import java.nio.charset.StandardCharsets;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.security.sasl.SaslException;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class OAuthBearerClientInitialResponseTest {
  
      /*
          Test how a client would build a response
       */
      @Test
      public void testBuildClientResponseToBytes() throws Exception {
          String expectedMessage = "n,,\u0001auth=Bearer 123.345.567\u0001nineteen=42\u0001\u0001";
  
          Map<String, String> extensions = new HashMap<>();
          extensions.put("nineteen", "42");
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse("123.345.567", new SaslExtensions(extensions));
  
          String message = new String(response.toBytes(), StandardCharsets.UTF_8);
  
          assertEquals(expectedMessage, message);
      }
  
      @Test
      public void testBuildServerResponseToBytes() throws Exception {
          String serverMessage = "n,,\u0001auth=Bearer 123.345.567\u0001nineteen=42\u0001\u0001";
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(serverMessage.getBytes(StandardCharsets.UTF_8));
  
          String message = new String(response.toBytes(), StandardCharsets.UTF_8);
  
          assertEquals(serverMessage, message);
      }
  
      @Test
      public void testThrowsSaslExceptionOnInvalidExtensionKey() {
          Map<String, String> extensions = new HashMap<>();
          extensions.put("19", "42"); // keys can only be a-z
          assertThrows(SaslException.class, () -> new OAuthBearerClientInitialResponse("123.345.567", new SaslExtensions(extensions)));
      }
  
      @Test
      public void testToken() throws Exception {
          String message = "n,,\u0001auth=Bearer 123.345.567\u0001\u0001";
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(message.getBytes(StandardCharsets.UTF_8));
          assertEquals("123.345.567", response.tokenValue());
          assertEquals("", response.authorizationId());
      }
  
      @Test
      public void testAuthorizationId() throws Exception {
          String message = "n,a=myuser,\u0001auth=Bearer 345\u0001\u0001";
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(message.getBytes(StandardCharsets.UTF_8));
          assertEquals("345", response.tokenValue());
          assertEquals("myuser", response.authorizationId());
      }
  
      @Test
      public void testExtensions() throws Exception {
          String message = "n,,\u0001propA=valueA1, valueA2\u0001auth=Bearer 567\u0001propB=valueB\u0001\u0001";
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(message.getBytes(StandardCharsets.UTF_8));
          assertEquals("567", response.tokenValue());
          assertEquals("", response.authorizationId());
          assertEquals("valueA1, valueA2", response.extensions().map().get("propA"));
          assertEquals("valueB", response.extensions().map().get("propB"));
      }
  
      // The example in the RFC uses `vF9dft4qmTc2Nvb3RlckBhbHRhdmlzdGEuY29tCg==` as the token
      // But since we use Base64Url encoding, padding is omitted. Hence this test verifies without '='.
      @Test
      public void testRfc7688Example() throws Exception {
          String message = "n,a=user@example.com,\u0001host=server.example.com\u0001port=143\u0001" +
                  "auth=Bearer vF9dft4qmTc2Nvb3RlckBhbHRhdmlzdGEuY29tCg\u0001\u0001";
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(message.getBytes(StandardCharsets.UTF_8));
          assertEquals("vF9dft4qmTc2Nvb3RlckBhbHRhdmlzdGEuY29tCg", response.tokenValue());
          assertEquals("user@example.com", response.authorizationId());
          assertEquals("server.example.com", response.extensions().map().get("host"));
          assertEquals("143", response.extensions().map().get("port"));
      }
  
      // RFC 6750 token format  1*( ALPHA / DIGIT /"-" / "." / "_" / "~" / "+" / "/" ) *"="
      @Test
      public void testCharSupportForRfc6750Token() throws Exception {
          String message = "n,a=user@example.com,\u0001host=server.example.com\u0001port=143\u0001" +
                  "auth=Bearer vF-9.df_t4qm~Tc2Nvb3RlckBhbHR+hdmlzdGEuY29/tCg==\u0001\u0001";
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(message.getBytes(StandardCharsets.UTF_8));
          assertEquals("vF-9.df_t4qm~Tc2Nvb3RlckBhbHR+hdmlzdGEuY29/tCg==", response.tokenValue());
          assertEquals("user@example.com", response.authorizationId());
          assertEquals("server.example.com", response.extensions().map().get("host"));
          assertEquals("143", response.extensions().map().get("port"));
      }
  
      @Test
      public void testNoExtensionsFromByteArray() throws Exception {
          String message = "n,a=user@example.com,\u0001" +
                  "auth=Bearer vF9dft4qmTc2Nvb3RlckBhbHRhdmlzdGEuY29tCg\u0001\u0001";
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(message.getBytes(StandardCharsets.UTF_8));
          assertEquals("vF9dft4qmTc2Nvb3RlckBhbHRhdmlzdGEuY29tCg", response.tokenValue());
          assertEquals("user@example.com", response.authorizationId());
          assertTrue(response.extensions().map().isEmpty());
      }
  
      @Test
      public void testNoExtensionsFromTokenAndNullExtensions() throws Exception {
          OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse("token", null);
          assertTrue(response.extensions().map().isEmpty());
      }
  
      @Test
      public void testValidateNullExtensions() throws Exception {
          OAuthBearerClientInitialResponse.validateExtensions(null);
      }
  }
  