tus-java-client

tus is a protocol based on HTTP for resumable file uploads. Resumable means that an upload can be interrupted at any moment and can be resumed without re-uploading the previous data again. An interruption may happen willingly, if the user wants to pause, or by accident in case of a network issue or server outage.

tus-java-client is a library for uploading files using the tus protocol to any remote server supporting it.

This library is also compatible with the Android platform and can be used without any modifications using the API. The tus-android-client provides additional classes which can be used in addition the Java library.

Usage

// Create a new TusClient instance
TusClient client = new TusClient();

// Configure tus HTTP endpoint. This URL will be used for creating new uploads
// using the Creation extension
client.setUploadCreationURL(new URL("https://tusd.tusdemo.net/files"));

// Enable resumable uploads by storing the upload URL in memory
client.enableResuming(new TusURLMemoryStore());

// Open a file using which we will then create a TusUpload. If you do not have
// a File object, you can manually construct a TusUpload using an InputStream.
// See the documentation for more information.
File file = new File("./cute_kitten.png");
final TusUpload upload = new TusUpload(file);

System.out.println("Starting upload...");

// We wrap our uploading code in the TusExecutor class which will automatically catch
// exceptions and issue retries with small delays between them and take fully
// advantage of tus' resumability to offer more reliability.
// This step is optional but highly recommended.
TusExecutor executor = new TusExecutor() {
    @Override
    protected void makeAttempt() throws ProtocolException, IOException {
        // First try to resume an upload. If that's not possible we will create a new
        // upload and get a TusUploader in return. This class is responsible for opening
        // a connection to the remote server and doing the uploading.
        TusUploader uploader = client.resumeOrCreateUpload(upload);
        
        // Alternatively, if your tus server does not support the Creation extension
        // and you obtained an upload URL from another service, you can instruct
        // tus-java-client to upload to a specific URL. Please note that this is usually
        // _not_ necessary and only if the tus server does not support the Creation
        // extension. The Vimeo API would be an example where this method is needed.
        // TusUploader uploader = client.beginOrResumeUploadFromURL(upload, new URL("https://tus.server.net/files/my_file"));

        // Upload the file in chunks of 1KB sizes.
        uploader.setChunkSize(1024);

        // Upload the file as long as data is available. Once the
        // file has been fully uploaded the method will return -1
        do {
            // Calculate the progress using the total size of the uploading file and
            // the current offset.
            long totalBytes = upload.getSize();
            long bytesUploaded = uploader.getOffset();
            double progress = (double) bytesUploaded / totalBytes * 100;

            System.out.printf("Upload at %06.2f%%.\n", progress);
        } while(uploader.uploadChunk() > -1);

        // Allow the HTTP connection to be closed and cleaned up
        uploader.finish();

        System.out.println("Upload finished.");
        System.out.format("Upload available at: %s", uploader.getUploadURL().toString());
    }
};
executor.makeAttempts();

Installation

The JARs can be downloaded manually from our Maven Central Repo.

Gradle:

implementation 'io.tus.java.client:tus-java-client:0.5.0'

Maven:

<dependency>
  <groupId>io.tus.java.client</groupId>
  <artifactId>tus-java-client</artifactId>
  <version>0.5.0</version>
</dependency>

Documentation

The documentation of the latest versions can be found online at javadoc.io.

FAQ

Can I use my own custom SSLSocketFactory?

Yes, you can! Create a subclass of TusClient and override the prepareConnection method to attach your SSLSocketFactory. After this use your custom TusClient subclass as you would normally use it. Here is an example:

@Override
public void prepareConnection(@NotNull HttpURLConnection connection) {
    super.prepareConnection(connection);
    
    if(connection instanceof HttpsURLConnection) {
        HttpsURLConnection secureConnection = (HttpsURLConnection) connection;
        secureConnection.setSSLSocketFactory(mySSLSocketFactory);
    }
}

Can I use a proxy that will be used for uploading files?

Yes, just add a proxy to the TusClient as shown below (1 line added to the above usage):

TusClient client = new TusClient();
Proxy myProxy = new Proxy(...);
client.setProxy(myProxy);

License

MIT