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.camel.component.azure.key.vault.springboot;
  
  import com.azure.core.credential.TokenCredential;
  import com.azure.identity.ClientSecretCredential;
  import com.azure.identity.ClientSecretCredentialBuilder;
  import com.azure.identity.DefaultAzureCredentialBuilder;
  import com.azure.security.keyvault.secrets.SecretClient;
  import com.azure.security.keyvault.secrets.SecretClientBuilder;
  import org.apache.camel.RuntimeCamelException;
  import org.apache.camel.component.azure.key.vault.KeyVaultPropertiesFunction;
  import org.apache.camel.util.ObjectHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
  import org.springframework.boot.origin.OriginTrackedValue;
  import org.springframework.context.ApplicationListener;
  import org.springframework.core.env.ConfigurableEnvironment;
  import org.springframework.core.env.MapPropertySource;
  import org.springframework.core.env.PropertiesPropertySource;
  import org.springframework.core.env.PropertySource;
  
  import java.util.Properties;
  
  public class SpringBootAzureKeyVaultPropertiesParser implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {
      private static final Logger LOG = LoggerFactory.getLogger(SpringBootAzureKeyVaultPropertiesParser.class);
  
      @Override
      public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
          SecretClient client;
          ConfigurableEnvironment environment = event.getEnvironment();
          if (Boolean.parseBoolean(environment.getProperty("camel.component.azure-key-vault.early-resolve-properties"))) {
              String vaultName = environment.getProperty("camel.vault.azure.vaultName");
              String clientId = environment.getProperty("camel.vault.azure.clientId");
              String clientSecret = environment.getProperty("camel.vault.azure.clientSecret");
              String tenantId = environment.getProperty("camel.vault.azure.tenantId");
              boolean azureIdentityEnabled = Boolean.parseBoolean(System.getenv("camel.vault.azure.azureIdentityEnabled"));
              if (ObjectHelper.isNotEmpty(vaultName) && ObjectHelper.isNotEmpty(clientId) && ObjectHelper.isNotEmpty(clientSecret)
                      && ObjectHelper.isNotEmpty(tenantId) && !azureIdentityEnabled) {
                  String keyVaultUri = "https://" + vaultName + ".vault.azure.net";
  
                  // Credential
                  ClientSecretCredential credential = new ClientSecretCredentialBuilder()
                          .tenantId(tenantId)
                          .clientId(clientId)
                          .clientSecret(clientSecret)
                          .build();
  
                  // Build Client
                  client = new SecretClientBuilder()
                          .vaultUrl(keyVaultUri)
                          .credential(credential)
                          .buildClient();
              } else if (ObjectHelper.isNotEmpty(vaultName) && azureIdentityEnabled) {
                  String keyVaultUri = "https://" + vaultName + ".vault.azure.net";
  
                  // Credential
                  TokenCredential credential = new DefaultAzureCredentialBuilder().build();
  
                  // Build Client
                  client = new SecretClientBuilder()
                          .vaultUrl(keyVaultUri)
                          .credential(credential)
                          .buildClient();
              } else {
                  throw new RuntimeCamelException(
                          "Using the Azure Key Vault Properties Function requires setting Azure credentials as application properties or environment variables or enable the Azure Identity Authentication mechanism");
              }
              KeyVaultPropertiesFunction keyVaultPropertiesFunction = new KeyVaultPropertiesFunction(client);
              final Properties props = new Properties();
              for (PropertySource mutablePropertySources : event.getEnvironment().getPropertySources()) {
                  if (mutablePropertySources instanceof MapPropertySource mapPropertySource) {
                      mapPropertySource.getSource().forEach((key, value) -> {
                          String stringValue = null;
                          if ((value instanceof OriginTrackedValue originTrackedValue &&
                                  originTrackedValue.getValue() instanceof String v)) {
                              stringValue = v;
                          } else if (value instanceof String v) {
                              stringValue = v;
                          }
                          if (stringValue != null &&
                                  stringValue.startsWith("{{azure:") &&
                                  stringValue.endsWith("}}")) {
                              LOG.debug("decrypting and overriding property {}", key);
                              try {
                                  String element = keyVaultPropertiesFunction.apply(stringValue
                                          .replace("{{azure:", "")
                                          .replace("}}", ""));
                                  props.put(key, element);
                              } catch (Exception e) {
                                  // Log and do nothing
                                  LOG.debug("failed to parse property {}. This exception is ignored.", key, e);
                              }
                          }
                      });
                  }
              }
              environment.getPropertySources().addFirst(new PropertiesPropertySource("overridden-camel-azure-key-vault-properties", props));
          }
      }
  }
  