@Override
public Boolean send(ConnectionManager connectionManager) throws DespotifyException {
if (user == null) {
ManagedConnection connection = connectionManager.getManagedConnection();
user = connection.getSession().getUser();
connection.close();
}
if (playlist.getLoaded() == null) {
new LoadPlaylist(store, playlist).send(connectionManager);
}
if (!playlist.isCollaborative() && !playlist.getAuthor().equals(user.getId())) {
throw new DespotifyException("Playlist must be collaborative or owned by the current user!");
}
if (user.getPlaylists() == null) {
new LoadUserPlaylists(store, user).send(connectionManager);
}
if (playlist.getTracks() == null) {
playlist.setTracks(new ArrayList<Track>());
}
long previousChecksum = playlist.calculateChecksum();
if (position != null && position != playlist.getTracks().size()) {
throw new IllegalArgumentException("position not implemented!");
}
if (position == null) {
position = playlist.size();
}
playlist.getTracks().add(position, track);
playlist.setChecksum(playlist.calculateChecksum());
String xml = String.format(
"<change><ops><add><i>%s</i><items>%s</items></add></ops><time>%d</time><user>%s</user></change>" +
"<version>%010d,%010d,%010d,%d</version>",
position,
track.getId() + "01", // hex uuid tag
new Date().getTime() / 1000,
user.getId(),
playlist.getRevision() + 1,
playlist.getTracks().size(),
playlist.getChecksum(),
playlist.isCollaborative() ? 1 : 0
);
/* Create channel callback */
ChannelCallback callback = new ChannelCallback();
Channel channel = new Channel("Change-Playlist-Channel", Channel.Type.TYPE_PLAYLIST, callback);
byte[] xmlBytes = xml.getBytes();
ByteBuffer buffer = ByteBuffer.allocate(2 + 16 + 1 + 4 + 4 + 4 + 1 + 1 + xmlBytes.length);
/* Append channel id, playlist id and some bytes... */
buffer.putShort((short) channel.getId());
buffer.put(playlist.getByteUUID());
buffer.put((byte) 0x02); // track UUID type tag
buffer.putInt(playlist.getRevision().intValue());
buffer.putInt(playlist.getTracks().size() - 1);
buffer.putInt((int)previousChecksum); // -1 only seen when creating new playlist.
buffer.put((byte) (playlist.isCollaborative() ? 0x01 : 0x00));
buffer.put((byte) 0x03); // unknown
buffer.put(xmlBytes);
buffer.flip();
/* Register channel. */
Channel.register(channel);
/* Send packet. */
ManagedConnection connection = connectionManager.getManagedConnection();
connection.getProtocol().sendPacket(PacketType.changePlaylist, buffer, "add track to playlist");
/* Get response. */
byte[] data = callback.getData("add track to playlist, updated playlist response");
connection.close();
xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<playlist>\n" +
new String(data, Charset.forName("UTF-8")) +
"\n</playlist>";