Class AltsChannelBuilder

alts/src/main/java/io/grpc/alts/AltsChannelBuilder.java:34–97

ALTS version of ManagedChannelBuilder. This class sets up a secure and authenticated communication between two cloud VMs using ALTS.

 * communication between two cloud VMs using ALTS.
 */
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/4151")
public final class AltsChannelBuilder extends ForwardingChannelBuilder2<AltsChannelBuilder> {
  private final NettyChannelBuilder delegate;
  private final AltsChannelCredentials.Builder credentialsBuilder =
      new AltsChannelCredentials.Builder();

  /** "Overrides" the static method in {@link ManagedChannelBuilder}. */
  public static AltsChannelBuilder forTarget(String target) {
    return new AltsChannelBuilder(target);
  }

  /** "Overrides" the static method in {@link ManagedChannelBuilder}. */
  public static AltsChannelBuilder forAddress(String name, int port) {
    return forTarget(GrpcUtil.authorityFromHostAndPort(name, port));
  }

  private AltsChannelBuilder(String target) {
    delegate = NettyChannelBuilder.forTarget(target);
  }

  /**
   * Adds an expected target service accounts. One of the added service accounts should match peer
   * service account in the handshaker result. Otherwise, the handshake fails.
   */
  public AltsChannelBuilder addTargetServiceAccount(String targetServiceAccount) {
    credentialsBuilder.addTargetServiceAccount(targetServiceAccount);
    return this;
  }

  /**
   * Enables untrusted ALTS for testing. If this function is called, we will not check whether ALTS
   * is running on Google Cloud Platform.
   */
  public AltsChannelBuilder enableUntrustedAltsForTesting() {
    credentialsBuilder.enableUntrustedAltsForTesting();
    return this;
  }

  /** Sets a new handshaker service address for testing. */
  public AltsChannelBuilder setHandshakerAddressForTesting(String handshakerAddress) {
    credentialsBuilder.setHandshakerAddressForTesting(handshakerAddress);
    return this;
  }

  @Override
  protected NettyChannelBuilder delegate() {
    return delegate;
  }

  @Override
  public ManagedChannel build() {
    InternalNettyChannelBuilder.setProtocolNegotiatorFactory(
        delegate(),
        credentialsBuilder.buildProtocolNegotiatorFactory());

    return delegate().build();
  }