Spring data mongodb、SSLの設定方法は？

Spring Bootアプリをmongodbに接続するだけの場合は、keyStoreとtrustStoreをJavaコードで使用できます。したがって、コマンドラインから証明書を追加する必要はありません。 Cloud Foundryを使用している場合は、アプリをmongodbServicesに接続すると、System.getEnv（ "VCAP_SERVICES"）に必要なすべての資格情報を取得できます。

@Configuration
public class MongoConfiguration extends AbstractMongoConfiguration {
    private static Log logger = LogFactory.getLog(MongoConfiguration.class);
    @Value("${spring.data.mongodb.database}")
    private String defaultDatabase; //database you want to connect
    private String host;
    private int port;
    private String authenticationDb; //usually admin
    private String username;
    private char[] password;
    private String certificateDecoded; //your CA Certifcate decoded (starts with BEGIN CERTIFICATE)

    public MongoConfiguration() {
        //method for credentials initialization
    }

    //you can't set replicaset=replset in mongooptions so if you want set replicaset, you have to use 
    // customEditorConfigurer in combintaion with class that implementsPropertyEditorRegistrar
    @Bean
    public static CustomEditorConfigurer customEditorConfigurer(){
        CustomEditorConfigurer configurer = new CustomEditorConfigurer();
        configurer.setPropertyEditorRegistrars(
                new PropertyEditorRegistrar[]{new ServerAddressPropertyEditorRegistrar()});
        return configurer;
    }

    @Override
    protected String getDatabaseName() {
        return authenticationDb;
    }

    @Override
    @Bean
    public MongoClient mongoClient() {
        MongoClient mongoClient = new MongoClient(Arrays.asList(new ServerAddress(host, port)), mongoCredentials(), mongoClientOptions());
        return mongoClient;
    }

    @Bean
    public MongoClientOptions mongoClientOptions() {
        MongoClientOptions.Builder mongoClientOptions = MongoClientOptions.builder().sslInvalidHostNameAllowed(true).sslEnabled(true);
        try {
            InputStream inputStream = new ByteArrayInputStream(certificateDecoded.getBytes(StandardCharsets.UTF_8));
            CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
            X509Certificate caCert = (X509Certificate) certificateFactory.generateCertificate(inputStream);

            TrustManagerFactory trustManagerFactory = TrustManagerFactory
                    .getInstance(TrustManagerFactory.getDefaultAlgorithm());
            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            keyStore.load(null); // You don't need the KeyStore instance to come from a file.
            keyStore.setCertificateEntry("caCert", caCert);

            trustManagerFactory.init(keyStore);

            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustManagerFactory.getTrustManagers(), null);
            mongoClientOptions.sslContext(sslContext);
            mongoClientOptions.sslInvalidHostNameAllowed(true);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }

        return mongoClientOptions.build();
    }

    private MongoCredential mongoCredentials() {
        return MongoCredential.createCredential(username, authenticationDb, password);
    }

//With MongoTemplate you have access to db.
    @Bean
    public MongoTemplate mongoTemplate() {
        SimpleMongoDbFactory factory = new SimpleMongoDbFactory(mongoClient(), defaultDatabase);
        return new MongoClient(factory);

    }
}


public final class ServerAddressPropertyEditorRegistrar implements PropertyEditorRegistrar {
    @Override
    public void registerCustomEditors(PropertyEditorRegistry registry) {
        registry.registerCustomEditor(ServerAddress[].class, new ServerAddressPropertyEditor());
    }
}