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using Gdk;
using Gee;
using Xmpp;
using Dino.Entities;
namespace Dino {
public interface JingleFileEncryptionHelper : Object {
public abstract bool can_transfer(Conversation conversation);
public abstract async 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 Encryption get_encryption(Xmpp.Xep.JingleFileTransfer.FileTransfer jingle_transfer);
}
public class JingleFileEncryptionHelperTransferOnly : JingleFileEncryptionHelper, Object {
public bool can_transfer(Conversation conversation) {
return true;
}
public async 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 Encryption get_encryption(Xmpp.Xep.JingleFileTransfer.FileTransfer jingle_transfer) {
return Encryption.NONE;
}
}
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, JingleFileEncryptionHelper> encryption_helpers = new HashMap<Encryption, JingleFileEncryptionHelper>();
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<string, Xmpp.Xep.JingleFileTransfer.FileTransfer> file_transfers = new HashMap<string, Xmpp.Xep.JingleFileTransfer.FileTransfer>();
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 {
return file_meta;
}
public Encryption get_encryption(FileTransfer file_transfer, FileReceiveData receive_data, FileMeta file_meta) {
Xmpp.Xep.JingleFileTransfer.FileTransfer? jingle_file_transfer = file_transfers[file_transfer.info];
if (jingle_file_transfer == null) {
warning("Could not determine jingle encryption - transfer data not available anymore");
return Encryption.NONE;
}
foreach (JingleFileEncryptionHelper helper in JingleFileHelperRegistry.instance.encryption_helpers.values) {
var encryption = helper.get_encryption(jingle_file_transfer);
if (encryption != Encryption.NONE) return encryption;
}
return Encryption.NONE;
}
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");
}
try {
yield 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 async bool is_upload_available(Conversation conversation) {
if (conversation.type_ != Conversation.Type.CHAT) return false;
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<Jid>? resources = stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart);
if (resources == null) return false;
foreach (Jid full_jid in resources) {
if (yield stream.get_module(Xep.JingleFileTransfer.Module.IDENTITY).is_available(stream, full_jid)) {
return true;
}
}
return false;
}
public async long get_file_size_limit(Conversation conversation) {
if (yield can_send_conv(conversation)) {
return int.MAX;
}
return -1;
}
public async bool can_send(Conversation conversation, FileTransfer file_transfer) {
return yield can_send_conv(conversation);
}
private async bool can_send_conv(Conversation conversation) {
if (conversation.type_ != Conversation.Type.CHAT) return false;
// No file specific restrictions apply to Jingle file transfers
return yield is_upload_available(conversation);
}
public async bool can_encrypt(Conversation conversation, FileTransfer file_transfer) {
JingleFileEncryptionHelper? helper = JingleFileHelperRegistry.instance.get_encryption_helper(file_transfer.encryption);
if (helper == null) return false;
return yield 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 && yield helper.can_encrypt(conversation, file_transfer);
// TODO(hrxi): Prioritization of transports (and resources?).
foreach (Jid full_jid in stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart)) {
if (full_jid.equals(stream.get_flag(Bind.Flag.IDENTITY).my_jid)) {
continue;
}
if (!yield stream.get_module(Xep.JingleFileTransfer.Module.IDENTITY).is_available(stream, full_jid)) {
continue;
}
if (must_encrypt && !yield 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");
}
}
try {
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);
} catch (Error e) {
throw new FileSendError.UPLOAD_FAILED(@"offer_file_stream failed: $(e.message)");
}
return;
}
}
public int get_id() { return 1; }
public float get_priority() { return 50; }
}
}
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