using Gdk; using Gee; using Xmpp; using Dino.Entities; namespace Dino { public interface JingleFileEncryptionHelper : Object { public abstract bool can_transfer(Conversation conversation); public abstract bool can_encrypt(Conversation conversation, FileTransfer file_transfer, Jid? full_jid = null); public abstract string? get_precondition_name(Conversation conversation, FileTransfer file_transfer); public abstract Object? get_precondition_options(Conversation conversation, FileTransfer file_transfer); public abstract FileMeta complete_meta(FileTransfer file_transfer, FileReceiveData receive_data, FileMeta file_meta, Xmpp.Xep.JingleFileTransfer.FileTransfer jingle_transfer); } public class JingleFileEncryptionHelperTransferOnly : JingleFileEncryptionHelper, Object { public bool can_transfer(Conversation conversation) { return true; } public bool can_encrypt(Conversation conversation, FileTransfer file_transfer, Jid? full_jid) { return false; } public string? get_precondition_name(Conversation conversation, FileTransfer file_transfer) { return null; } public Object? get_precondition_options(Conversation conversation, FileTransfer file_transfer) { return null; } public FileMeta complete_meta(FileTransfer file_transfer, FileReceiveData receive_data, FileMeta file_meta, Xmpp.Xep.JingleFileTransfer.FileTransfer jingle_transfer) { return file_meta; } } public class JingleFileHelperRegistry { private static JingleFileHelperRegistry INSTANCE; public static JingleFileHelperRegistry instance { get { if (INSTANCE == null) { INSTANCE = new JingleFileHelperRegistry(); INSTANCE.add_encryption_helper(Encryption.NONE, new JingleFileEncryptionHelperTransferOnly()); } return INSTANCE; } } internal HashMap encryption_helpers = new HashMap(); public void add_encryption_helper(Encryption encryption, JingleFileEncryptionHelper helper) { encryption_helpers[encryption] = helper; } public JingleFileEncryptionHelper? get_encryption_helper(Encryption encryption) { if (encryption_helpers.has_key(encryption)) { return encryption_helpers[encryption]; } return null; } } public class JingleFileProvider : FileProvider, Object { private StreamInteractor stream_interactor; private HashMap file_transfers = new HashMap(); public JingleFileProvider(StreamInteractor stream_interactor) { this.stream_interactor = stream_interactor; stream_interactor.stream_negotiated.connect(on_stream_negotiated); } public FileMeta get_file_meta(FileTransfer file_transfer) throws FileReceiveError { var file_meta = new FileMeta(); file_meta.file_name = file_transfer.file_name; file_meta.size = file_transfer.size; return file_meta; } public FileReceiveData? get_file_receive_data(FileTransfer file_transfer) { return new FileReceiveData(); } public async FileMeta get_meta_info(FileTransfer file_transfer, FileReceiveData receive_data, FileMeta file_meta) throws FileReceiveError { Xmpp.Xep.JingleFileTransfer.FileTransfer? jingle_file_transfer = file_transfers[file_transfer.info]; if (jingle_file_transfer == null) { throw new FileReceiveError.DOWNLOAD_FAILED("Transfer data not available anymore"); } FileMeta meta = file_meta; foreach (JingleFileEncryptionHelper helper in JingleFileHelperRegistry.instance.encryption_helpers.values) { meta = helper.complete_meta(file_transfer, receive_data, meta, jingle_file_transfer); } return meta; } public async InputStream download(FileTransfer file_transfer, FileReceiveData receive_data, FileMeta file_meta) throws FileReceiveError { // TODO(hrxi) What should happen if `stream == null`? XmppStream? stream = stream_interactor.get_stream(file_transfer.account); Xmpp.Xep.JingleFileTransfer.FileTransfer? jingle_file_transfer = file_transfers[file_transfer.info]; if (jingle_file_transfer == null) { throw new FileReceiveError.DOWNLOAD_FAILED("Transfer data not available anymore"); } foreach (JingleFileEncryptionHelper helper in JingleFileHelperRegistry.instance.encryption_helpers.values) { helper.complete_meta(file_transfer, receive_data, file_meta, jingle_file_transfer); } try { jingle_file_transfer.accept(stream); } catch (IOError e) { throw new FileReceiveError.DOWNLOAD_FAILED("Establishing connection did not work"); } return jingle_file_transfer.stream; } public int get_id() { return 1; } private void on_stream_negotiated(Account account, XmppStream stream) { stream_interactor.module_manager.get_module(account, Xmpp.Xep.JingleFileTransfer.Module.IDENTITY).file_incoming.connect((stream, jingle_file_transfer) => { Conversation? conversation = stream_interactor.get_module(ConversationManager.IDENTITY).get_conversation(jingle_file_transfer.peer.bare_jid, account); if (conversation == null) { // TODO(hrxi): What to do? return; } string id = random_uuid(); file_transfers[id] = jingle_file_transfer; FileMeta file_meta = new FileMeta(); file_meta.size = jingle_file_transfer.size; file_meta.file_name = jingle_file_transfer.file_name; var time = new DateTime.now_utc(); var from = jingle_file_transfer.peer.bare_jid; file_incoming(id, from, time, time, conversation, new FileReceiveData(), file_meta); }); } } public class JingleFileSender : FileSender, Object { private StreamInteractor stream_interactor; public JingleFileSender(StreamInteractor stream_interactor) { this.stream_interactor = stream_interactor; } public bool is_upload_available(Conversation conversation) { JingleFileEncryptionHelper? helper = JingleFileHelperRegistry.instance.get_encryption_helper(conversation.encryption); if (helper == null) return false; if (!helper.can_transfer(conversation)) return false; XmppStream? stream = stream_interactor.get_stream(conversation.account); if (stream == null) return false; Gee.List? resources = stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart); if (resources == null) return false; foreach (Jid full_jid in resources) { if (stream.get_module(Xep.JingleFileTransfer.Module.IDENTITY).is_available(stream, full_jid)) { return true; } } return false; } public bool can_send(Conversation conversation, FileTransfer file_transfer) { // No file specific restrictions apply to Jingle file transfers return is_upload_available(conversation); } public bool can_encrypt(Conversation conversation, FileTransfer file_transfer) { JingleFileEncryptionHelper? helper = JingleFileHelperRegistry.instance.get_encryption_helper(file_transfer.encryption); if (helper == null) return false; return helper.can_encrypt(conversation, file_transfer); } public async FileSendData? prepare_send_file(Conversation conversation, FileTransfer file_transfer, FileMeta file_meta) throws FileSendError { if (file_meta is HttpFileMeta) { throw new FileSendError.UPLOAD_FAILED("Cannot upload http file meta over Jingle"); } return new FileSendData(); } public async void send_file(Conversation conversation, FileTransfer file_transfer, FileSendData file_send_data, FileMeta file_meta) throws FileSendError { XmppStream? stream = stream_interactor.get_stream(file_transfer.account); if (stream == null) throw new FileSendError.UPLOAD_FAILED("No stream available"); JingleFileEncryptionHelper? helper = JingleFileHelperRegistry.instance.get_encryption_helper(file_transfer.encryption); bool must_encrypt = helper != null && helper.can_encrypt(conversation, file_transfer); foreach (Jid full_jid in stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart)) { // TODO(hrxi): Prioritization of transports (and resources?). if (!stream.get_module(Xep.JingleFileTransfer.Module.IDENTITY).is_available(stream, full_jid)) { continue; } if (must_encrypt && !helper.can_encrypt(conversation, file_transfer, full_jid)) { continue; } string? precondition_name = null; Object? precondition_options = null; if (must_encrypt) { precondition_name = helper.get_precondition_name(conversation, file_transfer); precondition_options = helper.get_precondition_options(conversation, file_transfer); if (precondition_name == null) { throw new FileSendError.ENCRYPTION_FAILED("Should have created a precondition, but did not"); } } yield stream.get_module(Xep.JingleFileTransfer.Module.IDENTITY).offer_file_stream(stream, full_jid, file_transfer.input_stream, file_transfer.server_file_name, file_meta.size, precondition_name, precondition_options); return; } } public int get_id() { return 1; } public float get_priority() { return 50; } } }