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Signal Protocol cryptography library for Java
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package org.signal.libsignal.metadata.protocol;

import org.signal.client.internal.Native;
import org.signal.client.internal.NativeHandleGuard;

import org.signal.libsignal.metadata.InvalidMetadataMessageException;
import org.signal.libsignal.metadata.certificate.InvalidCertificateException;
import org.signal.libsignal.metadata.certificate.SenderCertificate;
import org.whispersystems.libsignal.protocol.CiphertextMessage;

import java.util.Optional;

public class UnidentifiedSenderMessageContent implements NativeHandleGuard.Owner {
  // Must be kept in sync with sealed_sender.proto.
  public static final int CONTENT_HINT_DEFAULT    = 0;
  public static final int CONTENT_HINT_RESENDABLE = 1;
  public static final int CONTENT_HINT_IMPLICIT   = 2;

  private final long unsafeHandle;

  @Override
  protected void finalize() {
     Native.UnidentifiedSenderMessageContent_Destroy(this.unsafeHandle);
  }

  public UnidentifiedSenderMessageContent(long nativeHandle) {
    this.unsafeHandle = nativeHandle;
  }

  public long unsafeNativeHandleWithoutGuard() {
    return this.unsafeHandle;
  }

  public UnidentifiedSenderMessageContent(byte[] serialized) throws InvalidMetadataMessageException, InvalidCertificateException {
    try {
      this.unsafeHandle = Native.UnidentifiedSenderMessageContent_Deserialize(serialized);
    } catch (Exception e) {
      throw new InvalidMetadataMessageException(e);
    }
  }

  public UnidentifiedSenderMessageContent(CiphertextMessage message,
                                          SenderCertificate senderCertificate,
                                          int contentHint,
                                          Optional groupId) {
    try (NativeHandleGuard certificateGuard = new NativeHandleGuard(senderCertificate)) {
      this.unsafeHandle = Native.UnidentifiedSenderMessageContent_New(
        message,
        certificateGuard.nativeHandle(),
        contentHint,
        groupId.orElse(null));
    }
  }

  public int getType() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return Native.UnidentifiedSenderMessageContent_GetMsgType(guard.nativeHandle());
    }
  }

  public SenderCertificate getSenderCertificate() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return new SenderCertificate(Native.UnidentifiedSenderMessageContent_GetSenderCert(guard.nativeHandle()));
    }
  }

  public byte[] getContent() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return Native.UnidentifiedSenderMessageContent_GetContents(guard.nativeHandle());
    }
  }

  public byte[] getSerialized() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return Native.UnidentifiedSenderMessageContent_GetSerialized(guard.nativeHandle());
    }
  }

  public int getContentHint() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return Native.UnidentifiedSenderMessageContent_GetContentHint(guard.nativeHandle());
    }
  }

  public Optional getGroupId() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return Optional.ofNullable(Native.UnidentifiedSenderMessageContent_GetGroupId(guard.nativeHandle()));
    }
  }
}