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.config;
  
  import org.apache.kafka.common.config.provider.ConfigProvider;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Set;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class ConfigTransformerTest {
  
      public static final String MY_KEY = "myKey";
      public static final String TEST_INDIRECTION = "testIndirection";
      public static final String TEST_KEY = "testKey";
      public static final String TEST_KEY_WITH_TTL = "testKeyWithTTL";
      public static final String TEST_PATH = "testPath";
      public static final String TEST_RESULT = "testResult";
      public static final String TEST_RESULT_WITH_TTL = "testResultWithTTL";
      public static final String TEST_RESULT_NO_PATH = "testResultNoPath";
  
      private ConfigTransformer configTransformer;
  
      @BeforeEach
      public void setup() {
          configTransformer = new ConfigTransformer(Collections.singletonMap("test", new TestConfigProvider()));
      }
  
      @Test
      public void testReplaceVariable() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:testKey}"));
          Map<String, String> data = result.data();
          Map<String, Long> ttls = result.ttls();
          assertEquals(TEST_RESULT, data.get(MY_KEY));
          assertTrue(ttls.isEmpty());
      }
  
      @Test
      public void testReplaceVariableWithTTL() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:testKeyWithTTL}"));
          Map<String, String> data = result.data();
          Map<String, Long> ttls = result.ttls();
          assertEquals(TEST_RESULT_WITH_TTL, data.get(MY_KEY));
          assertEquals(1L, ttls.get(TEST_PATH).longValue());
      }
  
      @Test
      public void testReplaceMultipleVariablesInValue() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "hello, ${test:testPath:testKey}; goodbye, ${test:testPath:testKeyWithTTL}!!!"));
          Map<String, String> data = result.data();
          assertEquals("hello, testResult; goodbye, testResultWithTTL!!!", data.get(MY_KEY));
      }
  
      @Test
      public void testNoReplacement() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:missingKey}"));
          Map<String, String> data = result.data();
          assertEquals("${test:testPath:missingKey}", data.get(MY_KEY));
      }
  
      @Test
      public void testSingleLevelOfIndirection() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testPath:testIndirection}"));
          Map<String, String> data = result.data();
          assertEquals("${test:testPath:testResult}", data.get(MY_KEY));
      }
  
      @Test
      public void testReplaceVariableNoPath() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "${test:testKey}"));
          Map<String, String> data = result.data();
          Map<String, Long> ttls = result.ttls();
          assertEquals(TEST_RESULT_NO_PATH, data.get(MY_KEY));
          assertTrue(ttls.isEmpty());
      }
  
      @Test
      public void testReplaceMultipleVariablesWithoutPathInValue() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, "first ${test:testKey}; second ${test:testKey}"));
          Map<String, String> data = result.data();
          assertEquals("first testResultNoPath; second testResultNoPath", data.get(MY_KEY));
      }
  
      @Test
      public void testNullConfigValue() {
          ConfigTransformerResult result = configTransformer.transform(Collections.singletonMap(MY_KEY, null));
          Map<String, String> data = result.data();
          Map<String, Long> ttls = result.ttls();
          assertNull(data.get(MY_KEY));
          assertTrue(ttls.isEmpty());
      }
  
      public static class TestConfigProvider implements ConfigProvider {
  
          public void configure(Map<String, ?> configs) {
          }
  
          public ConfigData get(String path) {
              return null;
          }
  
          public ConfigData get(String path, Set<String> keys) {
              Map<String, String> data = new HashMap<>();
              Long ttl = null;
              if (TEST_PATH.equals(path)) {
                  if (keys.contains(TEST_KEY)) {
                      data.put(TEST_KEY, TEST_RESULT);
                  }
                  if (keys.contains(TEST_KEY_WITH_TTL)) {
                      data.put(TEST_KEY_WITH_TTL, TEST_RESULT_WITH_TTL);
                      ttl = 1L;
                  }
                  if (keys.contains(TEST_INDIRECTION)) {
                      data.put(TEST_INDIRECTION, "${test:testPath:testResult}");
                  }
              } else {
                  if (keys.contains(TEST_KEY)) {
                      data.put(TEST_KEY, TEST_RESULT_NO_PATH);
                  }
              }
              return new ConfigData(data, ttl);
          }
  
          public void close() {
          }
      }
  
  }
  