SMB Support

Spring Integration provides support for file transfer operations with SMB.

The Server Message Block (SMB) is a simple network protocol that lets you transfer files to a shared file server.

You need to include this dependency into your project:

Maven

<dependency>
    <groupId>org.springframework.integration</groupId>
    <artifactId>spring-integration-smb</artifactId>
    <version>6.0.0-M3</version>
</dependency>

Gradle

compile "org.springframework.integration:spring-integration-smb:6.0.0-M3"

Overview

The Java CIFS Client Library has been chosen as a Java implementation for the CIFS/SMB networking protocol. Its SmbFile abstraction is simply wrapped to the Spring Integration "Remote File" foundations like SmbSession, SmbRemoteFileTemplate, etc.

The SMB Channel Adapters and support classes implementations are fully similar to existing components for (S)FTP or AWS S3 protocols. So, if you familiar with those components it is pretty straightforward to use.

SMB Session Factory

Before configuring the SMB adapter, you must configure an SMB session factory. You can configure the SMB session factory with a regular bean definition, as the following examples show:

The SmbSessionFactory exposes options to set the SMB protocol with Min/Max versions. For example, supporting a minimum version of SMB 2.1 and a maximum version of the SMB 3.1.1:

@Bean
public SmbSessionFactory smbSessionFactory() {
    SmbSessionFactory smbSession = new SmbSessionFactory();
    smbSession.setHost("myHost");
    smbSession.setPort(445);
    smbSession.setDomain("myDomain");
    smbSession.setUsername("myUser");
    smbSession.setPassword("myPassword");
    smbSession.setShareAndDir("myShareAndDir");
    smbSession.setSmbMinVersion(DialectVersion.SMB210);
    smbSession.setSmbMaxVersion(DialectVersion.SMB311);
    return smbSession;
}

The SmbSessionFactory can be initialized with a custom jcifs.CIFSContext.

Setting of the SMB protocol Min/Max versions must be done in your implementation of jcifs.CIFSContext.

@Bean
public SmbSessionFactory smbSessionFactory() {
    SmbSessionFactory smbSession = new SmbSessionFactory(new MyCIFSContext());
    smbSession.setHost("myHost");
    smbSession.setPort(445);
    smbSession.setDomain("myDomain");
    smbSession.setUsername("myUser");
    smbSession.setPassword("myPassword");
    smbSession.setShareAndDir("myShareAndDir");
    return smbSession;
}

SMB Inbound Channel Adapter

To download SMB files locally the SmbInboundFileSynchronizingMessageSource is provided. It is simple extension of the AbstractInboundFileSynchronizingMessageSource which requires SmbInboundFileSynchronizer injection. For filtering remote files you still can use any existing FileListFilter implementations, but particular SmbRegexPatternFileListFilter and SmbSimplePatternFileListFilter are provided.

@Bean
public SmbInboundFileSynchronizer smbInboundFileSynchronizer() {
    SmbInboundFileSynchronizer fileSynchronizer =
        new SmbInboundFileSynchronizer(smbSessionFactory());
    fileSynchronizer.setFilter(compositeFileListFilter());
    fileSynchronizer.setRemoteDirectory("mySharedDirectoryPath");
    fileSynchronizer.setDeleteRemoteFiles(true);
    return fileSynchronizer;
}

@Bean
public CompositeFileListFilter<SmbFile> compositeFileListFilter() {
    CompositeFileListFilter<SmbFile> filters = new CompositeFileListFilter<>();
    filters.addFilter(new SmbRegexPatternFileListFilter("^(?i).+((\\.txt))$"));
    return filters;
}

@Bean
public MessageChannel smbFileInputChannel() {
    return new DirectChannel();
}

@Bean
@InboundChannelAdapter(value = "smbFileInputChannel",
                       poller = @Poller(fixedDelay = "2000"))
public MessageSource<File> smbMessageSource() {
    SmbInboundFileSynchronizingMessageSource messageSource =
        new SmbInboundFileSynchronizingMessageSource(smbInboundFileSynchronizer());
    messageSource.setLocalDirectory(new File("myLocalDirectoryPath"));
    messageSource.setAutoCreateLocalDirectory(true);
    return messageSource;
}

For XML configuration the <int-smb:inbound-channel-adapter> component is provided.

Configuring with the Java DSL

The following Spring Boot application shows an example of how to configure the inbound adapter with the Java DSL:

@SpringBootApplication
public class SmbJavaApplication {

    public static void main(String[] args) {
        new SpringApplicationBuilder(SmbJavaApplication.class)
            .web(false)
            .run(args);
    }

    @Bean
    public SmbSessionFactory smbSessionFactory() {
        SmbSessionFactory smbSession = new SmbSessionFactory();
        smbSession.setHost("myHost");
        smbSession.setPort(445);
        smbSession.setDomain("myDomain");
        smbSession.setUsername("myUser");
        smbSession.setPassword("myPassword");
        smbSession.setShareAndDir("myShareAndDir");
        smbSession.setSmbMinVersion(DialectVersion.SMB210);
        smbSession.setSmbMaxVersion(DialectVersion.SMB311);
        return smbSession;
    }

    @Bean
    public IntegrationFlow smbInboundFlow() {
        return IntegrationFlows
            .from(Smb.inboundAdapter(smbSessionFactory())
                    .preserveTimestamp(true)
                    .remoteDirectory("smbSource")
                    .regexFilter(".*\\.txt$")
                    .localFilename(f -> f.toUpperCase() + ".a")
                    .localDirectory(new File("d:\\smb_files")),
                        e -> e.id("smbInboundAdapter")
                    .autoStartup(true)
                    .poller(Pollers.fixedDelay(5000)))
            .handle(m -> System.out.println(m.getPayload()))
            .get();
    }
}

SMB Outbound Channel Adapter

For writing files to an SMB share, and for XML <int-smb:outbound-channel-adapter> component we use the SmbMessageHandler. In case of Java configuration a SmbMessageHandler should be supplied with the SmbSessionFactory (or SmbRemoteFileTemplate).

@Bean
@ServiceActivator(inputChannel = "storeToSmbShare")
public MessageHandler smbMessageHandler(SmbSessionFactory smbSessionFactory) {
    SmbMessageHandler handler = new SmbMessageHandler(smbSessionFactory);
    handler.setRemoteDirectoryExpression(
        new LiteralExpression("remote-target-dir"));
    handler.setFileNameGenerator(m ->
        m.getHeaders().get(FileHeaders.FILENAME, String.class) + ".test");
    handler.setAutoCreateDirectory(true);
    return handler;
}

Configuring with the Java DSL

The following Spring Boot application shows an example of how to configure the outbound adapter using the Java DSL:

@SpringBootApplication
@IntegrationComponentScan
public class SmbJavaApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context =
            new SpringApplicationBuilder(SmbJavaApplication.class)
                .web(false)
                .run(args);
        MyGateway gateway = context.getBean(MyGateway.class);
        gateway.sendToSmb(new File("/foo/bar.txt"));
    }

    @Bean
    public SmbSessionFactory smbSessionFactory() {
        SmbSessionFactory smbSession = new SmbSessionFactory();
        smbSession.setHost("myHost");
        smbSession.setPort(445);
        smbSession.setDomain("myDomain");
        smbSession.setUsername("myUser");
        smbSession.setPassword("myPassword");
        smbSession.setShareAndDir("myShareAndDir");
        smbSession.setSmbMinVersion(DialectVersion.SMB210);
        smbSession.setSmbMaxVersion(DialectVersion.SMB311);
        return smbSession;
    }

    @Bean
    public IntegrationFlow smbOutboundFlow() {
        return IntegrationFlows.from("toSmbChannel")
                .handle(Smb.outboundAdapter(smbSessionFactory(), FileExistsMode.REPLACE)
                        .useTemporaryFileName(false)
                        .fileNameExpression("headers['" + FileHeaders.FILENAME + "']")
                        .remoteDirectory("smbTarget")
                ).get();
    }

    @MessagingGateway
    public interface MyGateway {

         @Gateway(requestChannel = "toSmbChannel")
         void sendToSmb(File file);
    }

}