nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java

   1 package org.asamk.signal.dbus;
   2
   3 import org.asamk.Signal;
   4 import org.asamk.signal.DbusConfig;
   5 import org.asamk.signal.manager.AttachmentInvalidException;
   6 import org.asamk.signal.manager.Manager;
   7 import org.asamk.signal.manager.NotMasterDeviceException;
   8 import org.asamk.signal.manager.StickerPackInvalidException;
   9 import org.asamk.signal.manager.UntrustedIdentityException;
  10 import org.asamk.signal.manager.api.Device;
  11 import org.asamk.signal.manager.api.Group;
  12 import org.asamk.signal.manager.api.Identity;
  13 import org.asamk.signal.manager.api.InactiveGroupLinkException;
  14 import org.asamk.signal.manager.api.InvalidDeviceLinkException;
  15 import org.asamk.signal.manager.api.Message;
  16 import org.asamk.signal.manager.api.Pair;
  17 import org.asamk.signal.manager.api.RecipientIdentifier;
  18 import org.asamk.signal.manager.api.SendGroupMessageResults;
  19 import org.asamk.signal.manager.api.SendMessageResults;
  20 import org.asamk.signal.manager.api.TypingAction;
  21 import org.asamk.signal.manager.api.UpdateGroup;
  22 import org.asamk.signal.manager.groups.GroupId;
  23 import org.asamk.signal.manager.groups.GroupInviteLinkUrl;
  24 import org.asamk.signal.manager.groups.GroupNotFoundException;
  25 import org.asamk.signal.manager.groups.GroupPermission;
  26 import org.asamk.signal.manager.groups.GroupSendingNotAllowedException;
  27 import org.asamk.signal.manager.groups.LastGroupAdminException;
  28 import org.asamk.signal.manager.groups.NotAGroupMemberException;
  29 import org.asamk.signal.manager.storage.recipients.Contact;
  30 import org.asamk.signal.manager.storage.recipients.Profile;
  31 import org.asamk.signal.manager.storage.recipients.RecipientAddress;
  32 import org.freedesktop.dbus.DBusPath;
  33 import org.freedesktop.dbus.connections.impl.DBusConnection;
  34 import org.freedesktop.dbus.exceptions.DBusException;
  35 import org.freedesktop.dbus.interfaces.DBusInterface;
  36 import org.whispersystems.signalservice.api.messages.SignalServiceAttachmentRemoteId;
  37 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
  38 import org.whispersystems.signalservice.api.push.exceptions.UnregisteredUserException;
  39 import org.whispersystems.signalservice.api.util.UuidUtil;
  40 import org.whispersystems.signalservice.internal.contacts.crypto.UnauthenticatedResponseException;
  41
  42 import java.io.File;
  43 import java.io.IOException;
  44 import java.net.URI;
  45 import java.net.URISyntaxException;
  46 import java.util.ArrayList;
  47 import java.util.HashMap;
  48 import java.util.List;
  49 import java.util.Map;
  50 import java.util.Optional;
  51 import java.util.Set;
  52 import java.util.UUID;
  53 import java.util.concurrent.TimeUnit;
  54 import java.util.function.Function;
  55 import java.util.function.Supplier;
  56 import java.util.stream.Collectors;
  57
  58 /**
  59  * This class implements the Manager interface using the DBus Signal interface, where possible.
  60  * It's used for the signal-cli dbus client mode (--dbus, --dbus-system)
  61  */
  62 public class DbusManagerImpl implements Manager {
  63
  64     private final Signal signal;
  65     private final DBusConnection connection;
  66
  67     public DbusManagerImpl(final Signal signal, DBusConnection connection) {
  68         this.signal = signal;
  69         this.connection = connection;
  70     }
  71
  72     @Override
  73     public String getSelfNumber() {
  74         return signal.getSelfNumber();
  75     }
  76
  77     @Override
  78     public void checkAccountState() throws IOException {
  79         throw new UnsupportedOperationException();
  80     }
  81
  82     @Override
  83     public Map<String, Pair<String, UUID>> areUsersRegistered(final Set<String> numbers) throws IOException {
  84         final var numbersList = new ArrayList<>(numbers);
  85         final var registered = signal.isRegistered(numbersList);
  86
  87         final var result = new HashMap<String, Pair<String, UUID>>();
  88         for (var i = 0; i < numbersList.size(); i++) {
  89             result.put(numbersList.get(i),
  90                     new Pair<>(numbersList.get(i), registered.get(i) ? UuidUtil.UNKNOWN_UUID : null));
  91         }
  92         return result;
  93     }
  94
  95     @Override
  96     public void updateAccountAttributes(final String deviceName) throws IOException {
  97         if (deviceName != null) {
  98             final var devicePath = signal.getThisDevice();
  99             getRemoteObject(devicePath, Signal.Device.class).Set("org.asamk.Signal.Device", "Name", deviceName);
 100         }
 101     }
 102
 103     @Override
 104     public void updateConfiguration(
 105             final Boolean readReceipts,
 106             final Boolean unidentifiedDeliveryIndicators,
 107             final Boolean typingIndicators,
 108             final Boolean linkPreviews
 109     ) throws IOException {
 110         throw new UnsupportedOperationException();
 111     }
 112
 113     @Override
 114     public void setProfile(
 115             final String givenName,
 116             final String familyName,
 117             final String about,
 118             final String aboutEmoji,
 119             final Optional<File> avatar
 120     ) throws IOException {
 121         signal.updateProfile(emptyIfNull(givenName),
 122                 emptyIfNull(familyName),
 123                 emptyIfNull(about),
 124                 emptyIfNull(aboutEmoji),
 125                 avatar == null ? "" : avatar.map(File::getPath).orElse(""),
 126                 avatar != null && !avatar.isPresent());
 127     }
 128
 129     @Override
 130     public void unregister() throws IOException {
 131         throw new UnsupportedOperationException();
 132     }
 133
 134     @Override
 135     public void deleteAccount() throws IOException {
 136         throw new UnsupportedOperationException();
 137     }
 138
 139     @Override
 140     public void submitRateLimitRecaptchaChallenge(final String challenge, final String captcha) throws IOException {
 141         throw new UnsupportedOperationException();
 142     }
 143
 144     @Override
 145     public List<Device> getLinkedDevices() throws IOException {
 146         final var thisDevice = signal.getThisDevice();
 147         return signal.listDevices().stream().map(d -> {
 148             final var device = getRemoteObject(d.getObjectPath(),
 149                     Signal.Device.class).GetAll("org.asamk.Signal.Device");
 150             return new Device((long) device.get("Id").getValue(),
 151                     (String) device.get("Name").getValue(),
 152                     (long) device.get("Created").getValue(),
 153                     (long) device.get("LastSeen").getValue(),
 154                     thisDevice.equals(d.getObjectPath()));
 155         }).collect(Collectors.toList());
 156     }
 157
 158     @Override
 159     public void removeLinkedDevices(final long deviceId) throws IOException {
 160         final var devicePath = signal.getDevice(deviceId);
 161         getRemoteObject(devicePath, Signal.Device.class).removeDevice();
 162     }
 163
 164     @Override
 165     public void addDeviceLink(final URI linkUri) throws IOException, InvalidDeviceLinkException {
 166         signal.addDevice(linkUri.toString());
 167     }
 168
 169     @Override
 170     public void setRegistrationLockPin(final Optional<String> pin) throws IOException, UnauthenticatedResponseException {
 171         if (pin.isPresent()) {
 172             signal.setPin(pin.get());
 173         } else {
 174             signal.removePin();
 175         }
 176     }
 177
 178     @Override
 179     public Profile getRecipientProfile(final RecipientIdentifier.Single recipient) throws UnregisteredUserException {
 180         throw new UnsupportedOperationException();
 181     }
 182
 183     @Override
 184     public List<Group> getGroups() {
 185         final var groups = signal.listGroups();
 186         return groups.stream().map(Signal.StructGroup::getObjectPath).map(this::getGroup).collect(Collectors.toList());
 187     }
 188
 189     @Override
 190     public SendGroupMessageResults quitGroup(
 191             final GroupId groupId, final Set<RecipientIdentifier.Single> groupAdmins
 192     ) throws GroupNotFoundException, IOException, NotAGroupMemberException, LastGroupAdminException {
 193         if (groupAdmins.size() > 0) {
 194             throw new UnsupportedOperationException();
 195         }
 196         final var group = getRemoteObject(signal.getGroup(groupId.serialize()), Signal.Group.class);
 197         group.quitGroup();
 198         return new SendGroupMessageResults(0, List.of());
 199     }
 200
 201     @Override
 202     public void deleteGroup(final GroupId groupId) throws IOException {
 203         throw new UnsupportedOperationException();
 204     }
 205
 206     @Override
 207     public Pair<GroupId, SendGroupMessageResults> createGroup(
 208             final String name, final Set<RecipientIdentifier.Single> members, final File avatarFile
 209     ) throws IOException, AttachmentInvalidException {
 210         final var newGroupId = signal.createGroup(emptyIfNull(name),
 211                 members.stream().map(RecipientIdentifier.Single::getIdentifier).collect(Collectors.toList()),
 212                 avatarFile == null ? "" : avatarFile.getPath());
 213         return new Pair<>(GroupId.unknownVersion(newGroupId), new SendGroupMessageResults(0, List.of()));
 214     }
 215
 216     @Override
 217     public SendGroupMessageResults updateGroup(
 218             final GroupId groupId, final UpdateGroup updateGroup
 219     ) throws IOException, GroupNotFoundException, AttachmentInvalidException, NotAGroupMemberException, GroupSendingNotAllowedException {
 220         final var group = getRemoteObject(signal.getGroup(groupId.serialize()), Signal.Group.class);
 221         if (updateGroup.getName() != null) {
 222             group.Set("org.asamk.Signal.Group", "Name", updateGroup.getName());
 223         }
 224         if (updateGroup.getDescription() != null) {
 225             group.Set("org.asamk.Signal.Group", "Description", updateGroup.getDescription());
 226         }
 227         if (updateGroup.getAvatarFile() != null) {
 228             group.Set("org.asamk.Signal.Group",
 229                     "Avatar",
 230                     updateGroup.getAvatarFile() == null ? "" : updateGroup.getAvatarFile().getPath());
 231         }
 232         if (updateGroup.getExpirationTimer() != null) {
 233             group.Set("org.asamk.Signal.Group", "MessageExpirationTimer", updateGroup.getExpirationTimer());
 234         }
 235         if (updateGroup.getAddMemberPermission() != null) {
 236             group.Set("org.asamk.Signal.Group", "PermissionAddMember", updateGroup.getAddMemberPermission().name());
 237         }
 238         if (updateGroup.getEditDetailsPermission() != null) {
 239             group.Set("org.asamk.Signal.Group", "PermissionEditDetails", updateGroup.getEditDetailsPermission().name());
 240         }
 241         if (updateGroup.getIsAnnouncementGroup() != null) {
 242             group.Set("org.asamk.Signal.Group",
 243                     "PermissionSendMessage",
 244                     updateGroup.getIsAnnouncementGroup()
 245                             ? GroupPermission.ONLY_ADMINS.name()
 246                             : GroupPermission.EVERY_MEMBER.name());
 247         }
 248         if (updateGroup.getMembers() != null) {
 249             group.addMembers(updateGroup.getMembers()
 250                     .stream()
 251                     .map(RecipientIdentifier.Single::getIdentifier)
 252                     .collect(Collectors.toList()));
 253         }
 254         if (updateGroup.getRemoveMembers() != null) {
 255             group.removeMembers(updateGroup.getRemoveMembers()
 256                     .stream()
 257                     .map(RecipientIdentifier.Single::getIdentifier)
 258                     .collect(Collectors.toList()));
 259         }
 260         if (updateGroup.getAdmins() != null) {
 261             group.addAdmins(updateGroup.getAdmins()
 262                     .stream()
 263                     .map(RecipientIdentifier.Single::getIdentifier)
 264                     .collect(Collectors.toList()));
 265         }
 266         if (updateGroup.getRemoveAdmins() != null) {
 267             group.removeAdmins(updateGroup.getRemoveAdmins()
 268                     .stream()
 269                     .map(RecipientIdentifier.Single::getIdentifier)
 270                     .collect(Collectors.toList()));
 271         }
 272         if (updateGroup.isResetGroupLink()) {
 273             group.resetLink();
 274         }
 275         if (updateGroup.getGroupLinkState() != null) {
 276             switch (updateGroup.getGroupLinkState()) {
 277                 case DISABLED -> group.disableLink();
 278                 case ENABLED -> group.enableLink(false);
 279                 case ENABLED_WITH_APPROVAL -> group.enableLink(true);
 280             }
 281         }
 282         return new SendGroupMessageResults(0, List.of());
 283     }
 284
 285     @Override
 286     public Pair<GroupId, SendGroupMessageResults> joinGroup(final GroupInviteLinkUrl inviteLinkUrl) throws IOException, InactiveGroupLinkException {
 287         final var newGroupId = signal.joinGroup(inviteLinkUrl.getUrl());
 288         return new Pair<>(GroupId.unknownVersion(newGroupId), new SendGroupMessageResults(0, List.of()));
 289     }
 290
 291     @Override
 292     public void sendTypingMessage(
 293             final TypingAction action, final Set<RecipientIdentifier> recipients
 294     ) throws IOException, UntrustedIdentityException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 295         for (final var recipient : recipients) {
 296             if (recipient instanceof RecipientIdentifier.Single) {
 297                 signal.sendTyping(((RecipientIdentifier.Single) recipient).getIdentifier(),
 298                         action == TypingAction.STOP);
 299             } else if (recipient instanceof RecipientIdentifier.Group) {
 300                 throw new UnsupportedOperationException();
 301             }
 302         }
 303     }
 304
 305     @Override
 306     public void sendReadReceipt(
 307             final RecipientIdentifier.Single sender, final List<Long> messageIds
 308     ) throws IOException, UntrustedIdentityException {
 309         signal.sendReadReceipt(sender.getIdentifier(), messageIds);
 310     }
 311
 312     @Override
 313     public void sendViewedReceipt(
 314             final RecipientIdentifier.Single sender, final List<Long> messageIds
 315     ) throws IOException, UntrustedIdentityException {
 316         throw new UnsupportedOperationException();
 317     }
 318
 319     @Override
 320     public SendMessageResults sendMessage(
 321             final Message message, final Set<RecipientIdentifier> recipients
 322     ) throws IOException, AttachmentInvalidException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 323         return handleMessage(recipients,
 324                 numbers -> signal.sendMessage(message.messageText(), message.attachments(), numbers),
 325                 () -> signal.sendNoteToSelfMessage(message.messageText(), message.attachments()),
 326                 groupId -> signal.sendGroupMessage(message.messageText(), message.attachments(), groupId));
 327     }
 328
 329     @Override
 330     public SendMessageResults sendRemoteDeleteMessage(
 331             final long targetSentTimestamp, final Set<RecipientIdentifier> recipients
 332     ) throws IOException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 333         return handleMessage(recipients,
 334                 numbers -> signal.sendRemoteDeleteMessage(targetSentTimestamp, numbers),
 335                 () -> signal.sendRemoteDeleteMessage(targetSentTimestamp, signal.getSelfNumber()),
 336                 groupId -> signal.sendGroupRemoteDeleteMessage(targetSentTimestamp, groupId));
 337     }
 338
 339     @Override
 340     public SendMessageResults sendMessageReaction(
 341             final String emoji,
 342             final boolean remove,
 343             final RecipientIdentifier.Single targetAuthor,
 344             final long targetSentTimestamp,
 345             final Set<RecipientIdentifier> recipients
 346     ) throws IOException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 347         return handleMessage(recipients,
 348                 numbers -> signal.sendMessageReaction(emoji,
 349                         remove,
 350                         targetAuthor.getIdentifier(),
 351                         targetSentTimestamp,
 352                         numbers),
 353                 () -> signal.sendMessageReaction(emoji,
 354                         remove,
 355                         targetAuthor.getIdentifier(),
 356                         targetSentTimestamp,
 357                         signal.getSelfNumber()),
 358                 groupId -> signal.sendGroupMessageReaction(emoji,
 359                         remove,
 360                         targetAuthor.getIdentifier(),
 361                         targetSentTimestamp,
 362                         groupId));
 363     }
 364
 365     @Override
 366     public SendMessageResults sendEndSessionMessage(final Set<RecipientIdentifier.Single> recipients) throws IOException {
 367         signal.sendEndSessionMessage(recipients.stream()
 368                 .map(RecipientIdentifier.Single::getIdentifier)
 369                 .collect(Collectors.toList()));
 370         return new SendMessageResults(0, Map.of());
 371     }
 372
 373     @Override
 374     public void setContactName(
 375             final RecipientIdentifier.Single recipient, final String name
 376     ) throws NotMasterDeviceException, UnregisteredUserException {
 377         signal.setContactName(recipient.getIdentifier(), name);
 378     }
 379
 380     @Override
 381     public void setContactBlocked(
 382             final RecipientIdentifier.Single recipient, final boolean blocked
 383     ) throws NotMasterDeviceException, IOException {
 384         signal.setContactBlocked(recipient.getIdentifier(), blocked);
 385     }
 386
 387     @Override
 388     public void setGroupBlocked(
 389             final GroupId groupId, final boolean blocked
 390     ) throws GroupNotFoundException, IOException {
 391         setGroupProperty(groupId, "IsBlocked", blocked);
 392     }
 393
 394     private void setGroupProperty(final GroupId groupId, final String propertyName, final boolean blocked) {
 395         final var group = getRemoteObject(signal.getGroup(groupId.serialize()), Signal.Group.class);
 396         group.Set("org.asamk.Signal.Group", propertyName, blocked);
 397     }
 398
 399     @Override
 400     public void setExpirationTimer(
 401             final RecipientIdentifier.Single recipient, final int messageExpirationTimer
 402     ) throws IOException {
 403         signal.setExpirationTimer(recipient.getIdentifier(), messageExpirationTimer);
 404     }
 405
 406     @Override
 407     public URI uploadStickerPack(final File path) throws IOException, StickerPackInvalidException {
 408         try {
 409             return new URI(signal.uploadStickerPack(path.getPath()));
 410         } catch (URISyntaxException e) {
 411             throw new AssertionError(e);
 412         }
 413     }
 414
 415     @Override
 416     public void requestAllSyncData() throws IOException {
 417         signal.sendSyncRequest();
 418     }
 419
 420     @Override
 421     public void addReceiveHandler(final ReceiveMessageHandler handler) {
 422         throw new UnsupportedOperationException();
 423     }
 424
 425     @Override
 426     public void removeReceiveHandler(final ReceiveMessageHandler handler) {
 427         throw new UnsupportedOperationException();
 428     }
 429
 430     @Override
 431     public boolean isReceiving() {
 432         throw new UnsupportedOperationException();
 433     }
 434
 435     @Override
 436     public void receiveMessages(final ReceiveMessageHandler handler) throws IOException {
 437         throw new UnsupportedOperationException();
 438     }
 439
 440     @Override
 441     public void receiveMessages(
 442             final long timeout, final TimeUnit unit, final ReceiveMessageHandler handler
 443     ) throws IOException {
 444         throw new UnsupportedOperationException();
 445     }
 446
 447     @Override
 448     public void setIgnoreAttachments(final boolean ignoreAttachments) {
 449         throw new UnsupportedOperationException();
 450     }
 451
 452     @Override
 453     public boolean hasCaughtUpWithOldMessages() {
 454         throw new UnsupportedOperationException();
 455     }
 456
 457     @Override
 458     public boolean isContactBlocked(final RecipientIdentifier.Single recipient) {
 459         return signal.isContactBlocked(recipient.getIdentifier());
 460     }
 461
 462     @Override
 463     public File getAttachmentFile(final SignalServiceAttachmentRemoteId attachmentId) {
 464         throw new UnsupportedOperationException();
 465     }
 466
 467     @Override
 468     public void sendContacts() throws IOException {
 469         signal.sendContacts();
 470     }
 471
 472     @Override
 473     public List<Pair<RecipientAddress, Contact>> getContacts() {
 474         throw new UnsupportedOperationException();
 475     }
 476
 477     @Override
 478     public String getContactOrProfileName(final RecipientIdentifier.Single recipient) {
 479         return signal.getContactName(recipient.getIdentifier());
 480     }
 481
 482     @Override
 483     public Group getGroup(final GroupId groupId) {
 484         final var groupPath = signal.getGroup(groupId.serialize());
 485         return getGroup(groupPath);
 486     }
 487
 488     @SuppressWarnings("unchecked")
 489     private Group getGroup(final DBusPath groupPath) {
 490         final var group = getRemoteObject(groupPath, Signal.Group.class).GetAll("org.asamk.Signal.Group");
 491         final var id = (byte[]) group.get("Id").getValue();
 492         try {
 493             return new Group(GroupId.unknownVersion(id),
 494                     (String) group.get("Name").getValue(),
 495                     (String) group.get("Description").getValue(),
 496                     GroupInviteLinkUrl.fromUri((String) group.get("GroupInviteLink").getValue()),
 497                     ((List<String>) group.get("Members").getValue()).stream()
 498                             .map(m -> new RecipientAddress(null, m))
 499                             .collect(Collectors.toSet()),
 500                     ((List<String>) group.get("PendingMembers").getValue()).stream()
 501                             .map(m -> new RecipientAddress(null, m))
 502                             .collect(Collectors.toSet()),
 503                     ((List<String>) group.get("RequestingMembers").getValue()).stream()
 504                             .map(m -> new RecipientAddress(null, m))
 505                             .collect(Collectors.toSet()),
 506                     ((List<String>) group.get("Admins").getValue()).stream()
 507                             .map(m -> new RecipientAddress(null, m))
 508                             .collect(Collectors.toSet()),
 509                     (boolean) group.get("IsBlocked").getValue(),
 510                     (int) group.get("MessageExpirationTimer").getValue(),
 511                     GroupPermission.valueOf((String) group.get("PermissionAddMember").getValue()),
 512                     GroupPermission.valueOf((String) group.get("PermissionEditDetails").getValue()),
 513                     GroupPermission.valueOf((String) group.get("PermissionSendMessage").getValue()),
 514                     (boolean) group.get("IsMember").getValue(),
 515                     (boolean) group.get("IsAdmin").getValue());
 516         } catch (GroupInviteLinkUrl.InvalidGroupLinkException | GroupInviteLinkUrl.UnknownGroupLinkVersionException e) {
 517             throw new AssertionError(e);
 518         }
 519     }
 520
 521     @Override
 522     public List<Identity> getIdentities() {
 523         throw new UnsupportedOperationException();
 524     }
 525
 526     @Override
 527     public List<Identity> getIdentities(final RecipientIdentifier.Single recipient) {
 528         throw new UnsupportedOperationException();
 529     }
 530
 531     @Override
 532     public boolean trustIdentityVerified(final RecipientIdentifier.Single recipient, final byte[] fingerprint) {
 533         throw new UnsupportedOperationException();
 534     }
 535
 536     @Override
 537     public boolean trustIdentityVerifiedSafetyNumber(
 538             final RecipientIdentifier.Single recipient, final String safetyNumber
 539     ) {
 540         throw new UnsupportedOperationException();
 541     }
 542
 543     @Override
 544     public boolean trustIdentityVerifiedSafetyNumber(
 545             final RecipientIdentifier.Single recipient, final byte[] safetyNumber
 546     ) {
 547         throw new UnsupportedOperationException();
 548     }
 549
 550     @Override
 551     public boolean trustIdentityAllKeys(final RecipientIdentifier.Single recipient) {
 552         throw new UnsupportedOperationException();
 553     }
 554
 555     @Override
 556     public SignalServiceAddress resolveSignalServiceAddress(final SignalServiceAddress address) {
 557         return address;
 558     }
 559
 560     @Override
 561     public void close() throws IOException {
 562     }
 563
 564     private SendMessageResults handleMessage(
 565             Set<RecipientIdentifier> recipients,
 566             Function<List<String>, Long> recipientsHandler,
 567             Supplier<Long> noteToSelfHandler,
 568             Function<byte[], Long> groupHandler
 569     ) {
 570         long timestamp = 0;
 571         final var singleRecipients = recipients.stream()
 572                 .filter(r -> r instanceof RecipientIdentifier.Single)
 573                 .map(RecipientIdentifier.Single.class::cast)
 574                 .map(RecipientIdentifier.Single::getIdentifier)
 575                 .collect(Collectors.toList());
 576         if (singleRecipients.size() > 0) {
 577             timestamp = recipientsHandler.apply(singleRecipients);
 578         }
 579
 580         if (recipients.contains(RecipientIdentifier.NoteToSelf.INSTANCE)) {
 581             timestamp = noteToSelfHandler.get();
 582         }
 583         final var groupRecipients = recipients.stream()
 584                 .filter(r -> r instanceof RecipientIdentifier.Group)
 585                 .map(RecipientIdentifier.Group.class::cast)
 586                 .map(g -> g.groupId)
 587                 .collect(Collectors.toList());
 588         for (final var groupId : groupRecipients) {
 589             timestamp = groupHandler.apply(groupId.serialize());
 590         }
 591         return new SendMessageResults(timestamp, Map.of());
 592     }
 593
 594     private String emptyIfNull(final String string) {
 595         return string == null ? "" : string;
 596     }
 597
 598     private <T extends DBusInterface> T getRemoteObject(final DBusPath devicePath, final Class<T> type) {
 599         try {
 600             return connection.getRemoteObject(DbusConfig.getBusname(), devicePath.getPath(), type);
 601         } catch (DBusException e) {
 602             throw new AssertionError(e);
 603         }
 604     }
 605 }