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.kerberos;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class KerberosNameTest {
  
      @Test
      public void testParse() throws IOException {
          List<String> rules = Arrays.asList(
              "RULE:[1:$1](App\\..*)s/App\\.(.*)/$1/g",
              "RULE:[2:$1](App\\..*)s/App\\.(.*)/$1/g",
              "DEFAULT"
          );
  
          KerberosShortNamer shortNamer = KerberosShortNamer.fromUnparsedRules("REALM.COM", rules);
  
          KerberosName name = KerberosName.parse("App.service-name/example.com@REALM.COM");
          assertEquals("App.service-name", name.serviceName());
          assertEquals("example.com", name.hostName());
          assertEquals("REALM.COM", name.realm());
          assertEquals("service-name", shortNamer.shortName(name));
  
          name = KerberosName.parse("App.service-name@REALM.COM");
          assertEquals("App.service-name", name.serviceName());
          assertNull(name.hostName());
          assertEquals("REALM.COM", name.realm());
          assertEquals("service-name", shortNamer.shortName(name));
  
          name = KerberosName.parse("user/host@REALM.COM");
          assertEquals("user", name.serviceName());
          assertEquals("host", name.hostName());
          assertEquals("REALM.COM", name.realm());
          assertEquals("user", shortNamer.shortName(name));
      }
  
      @Test
      public void testToLowerCase() throws Exception {
          List<String> rules = Arrays.asList(
              "RULE:[1:$1]/L",
              "RULE:[2:$1](Test.*)s/ABC///L",
              "RULE:[2:$1](ABC.*)s/ABC/XYZ/g/L",
              "RULE:[2:$1](App\\..*)s/App\\.(.*)/$1/g/L",
              "RULE:[2:$1]/L",
              "DEFAULT"
          );
  
          KerberosShortNamer shortNamer = KerberosShortNamer.fromUnparsedRules("REALM.COM", rules);
  
          KerberosName name = KerberosName.parse("User@REALM.COM");
          assertEquals("user", shortNamer.shortName(name));
  
          name = KerberosName.parse("TestABC/host@FOO.COM");
          assertEquals("test", shortNamer.shortName(name));
  
          name = KerberosName.parse("ABC_User_ABC/host@FOO.COM");
          assertEquals("xyz_user_xyz", shortNamer.shortName(name));
  
          name = KerberosName.parse("App.SERVICE-name/example.com@REALM.COM");
          assertEquals("service-name", shortNamer.shortName(name));
  
          name = KerberosName.parse("User/root@REALM.COM");
          assertEquals("user", shortNamer.shortName(name));
      }
  
      @Test
      public void testToUpperCase() throws Exception {
          List<String> rules = Arrays.asList(
              "RULE:[1:$1]/U",
              "RULE:[2:$1](Test.*)s/ABC///U",
              "RULE:[2:$1](ABC.*)s/ABC/XYZ/g/U",
              "RULE:[2:$1](App\\..*)s/App\\.(.*)/$1/g/U",
              "RULE:[2:$1]/U",
              "DEFAULT"
          );
  
          KerberosShortNamer shortNamer = KerberosShortNamer.fromUnparsedRules("REALM.COM", rules);
  
          KerberosName name = KerberosName.parse("User@REALM.COM");
          assertEquals("USER", shortNamer.shortName(name));
  
          name = KerberosName.parse("TestABC/host@FOO.COM");
          assertEquals("TEST", shortNamer.shortName(name));
  
          name = KerberosName.parse("ABC_User_ABC/host@FOO.COM");
          assertEquals("XYZ_USER_XYZ", shortNamer.shortName(name));
  
          name = KerberosName.parse("App.SERVICE-name/example.com@REALM.COM");
          assertEquals("SERVICE-NAME", shortNamer.shortName(name));
  
          name = KerberosName.parse("User/root@REALM.COM");
          assertEquals("USER", shortNamer.shortName(name));
      }
  
      @Test
      public void testInvalidRules() {
          testInvalidRule(Collections.singletonList("default"));
          testInvalidRule(Collections.singletonList("DEFAUL"));
          testInvalidRule(Collections.singletonList("DEFAULT/L"));
          testInvalidRule(Collections.singletonList("DEFAULT/g"));
  
          testInvalidRule(Collections.singletonList("rule:[1:$1]"));
          testInvalidRule(Collections.singletonList("rule:[1:$1]/L/U"));
          testInvalidRule(Collections.singletonList("rule:[1:$1]/U/L"));
          testInvalidRule(Collections.singletonList("rule:[1:$1]/LU"));
          testInvalidRule(Collections.singletonList("RULE:[1:$1/L"));
          testInvalidRule(Collections.singletonList("RULE:[1:$1]/l"));
          testInvalidRule(Collections.singletonList("RULE:[2:$1](ABC.*)s/ABC/XYZ/L/g"));
      }
  
      private void testInvalidRule(List<String> rules) {
          assertThrows(
              IllegalArgumentException.class,
              () -> KerberosShortNamer.fromUnparsedRules("REALM.COM", rules));
      }
  }
  