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.Message;
  14 import org.asamk.signal.manager.api.RecipientIdentifier;
  15 import org.asamk.signal.manager.api.SendGroupMessageResults;
  16 import org.asamk.signal.manager.api.SendMessageResults;
  17 import org.asamk.signal.manager.api.TypingAction;
  18 import org.asamk.signal.manager.api.UpdateGroup;
  19 import org.asamk.signal.manager.groups.GroupId;
  20 import org.asamk.signal.manager.groups.GroupInviteLinkUrl;
  21 import org.asamk.signal.manager.groups.GroupNotFoundException;
  22 import org.asamk.signal.manager.groups.GroupPermission;
  23 import org.asamk.signal.manager.groups.GroupSendingNotAllowedException;
  24 import org.asamk.signal.manager.groups.LastGroupAdminException;
  25 import org.asamk.signal.manager.groups.NotAGroupMemberException;
  26 import org.asamk.signal.manager.storage.recipients.Contact;
  27 import org.asamk.signal.manager.storage.recipients.Profile;
  28 import org.asamk.signal.manager.storage.recipients.RecipientAddress;
  29 import org.freedesktop.dbus.DBusPath;
  30 import org.freedesktop.dbus.connections.impl.DBusConnection;
  31 import org.freedesktop.dbus.exceptions.DBusException;
  32 import org.freedesktop.dbus.interfaces.DBusInterface;
  33 import org.whispersystems.libsignal.IdentityKey;
  34 import org.whispersystems.libsignal.InvalidKeyException;
  35 import org.whispersystems.libsignal.util.Pair;
  36 import org.whispersystems.libsignal.util.guava.Optional;
  37 import org.whispersystems.signalservice.api.groupsv2.GroupLinkNotActiveException;
  38 import org.whispersystems.signalservice.api.messages.SignalServiceAttachmentRemoteId;
  39 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
  40 import org.whispersystems.signalservice.api.push.exceptions.UnregisteredUserException;
  41 import org.whispersystems.signalservice.api.util.UuidUtil;
  42 import org.whispersystems.signalservice.internal.contacts.crypto.UnauthenticatedResponseException;
  43
  44 import java.io.File;
  45 import java.io.IOException;
  46 import java.net.URI;
  47 import java.net.URISyntaxException;
  48 import java.util.ArrayList;
  49 import java.util.HashMap;
  50 import java.util.List;
  51 import java.util.Map;
  52 import java.util.Set;
  53 import java.util.UUID;
  54 import java.util.concurrent.TimeUnit;
  55 import java.util.function.Function;
  56 import java.util.function.Supplier;
  57 import java.util.stream.Collectors;
  58
  59 /**
  60  * This class implements the Manager interface using the DBus Signal interface, where possible.
  61  * It's used for the signal-cli dbus client mode (--dbus, --dbus-system)
  62  */
  63 public class DbusManagerImpl implements Manager {
  64
  65     private final Signal signal;
  66     private final DBusConnection connection;
  67
  68     public DbusManagerImpl(final Signal signal, DBusConnection connection) {
  69         this.signal = signal;
  70         this.connection = connection;
  71     }
  72
  73     @Override
  74     public String getSelfNumber() {
  75         return signal.getSelfNumber();
  76     }
  77
  78     @Override
  79     public void checkAccountState() throws IOException {
  80         throw new UnsupportedOperationException();
  81     }
  82
  83     @Override
  84     public Map<String, Pair<String, UUID>> areUsersRegistered(final Set<String> numbers) throws IOException {
  85         final var numbersList = new ArrayList<>(numbers);
  86         final var registered = signal.isRegistered(numbersList);
  87
  88         final var result = new HashMap<String, Pair<String, UUID>>();
  89         for (var i = 0; i < numbersList.size(); i++) {
  90             result.put(numbersList.get(i),
  91                     new Pair<>(numbersList.get(i), registered.get(i) ? UuidUtil.UNKNOWN_UUID : null));
  92         }
  93         return result;
  94     }
  95
  96     @Override
  97     public void updateAccountAttributes(final String deviceName) throws IOException {
  98         if (deviceName != null) {
  99             final var devicePath = signal.getThisDevice();
 100             getRemoteObject(devicePath, Signal.Device.class).Set("org.asamk.Signal.Device", "Name", deviceName);
 101         }
 102     }
 103
 104     @Override
 105     public void updateConfiguration(
 106             final Boolean readReceipts,
 107             final Boolean unidentifiedDeliveryIndicators,
 108             final Boolean typingIndicators,
 109             final Boolean linkPreviews
 110     ) throws IOException {
 111         throw new UnsupportedOperationException();
 112     }
 113
 114     @Override
 115     public void setProfile(
 116             final String givenName,
 117             final String familyName,
 118             final String about,
 119             final String aboutEmoji,
 120             final Optional<File> avatar
 121     ) throws IOException {
 122         signal.updateProfile(emptyIfNull(givenName),
 123                 emptyIfNull(familyName),
 124                 emptyIfNull(about),
 125                 emptyIfNull(aboutEmoji),
 126                 avatar == null ? "" : avatar.transform(File::getPath).or(""),
 127                 avatar != null && !avatar.isPresent());
 128     }
 129
 130     @Override
 131     public void unregister() throws IOException {
 132         throw new UnsupportedOperationException();
 133     }
 134
 135     @Override
 136     public void deleteAccount() throws IOException {
 137         throw new UnsupportedOperationException();
 138     }
 139
 140     @Override
 141     public void submitRateLimitRecaptchaChallenge(final String challenge, final String captcha) throws IOException {
 142         throw new UnsupportedOperationException();
 143     }
 144
 145     @Override
 146     public List<Device> getLinkedDevices() throws IOException {
 147         final var thisDevice = signal.getThisDevice();
 148         return signal.listDevices().stream().map(d -> {
 149             final var device = getRemoteObject(d.getObjectPath(),
 150                     Signal.Device.class).GetAll("org.asamk.Signal.Device");
 151             return new Device((long) device.get("Id").getValue(),
 152                     (String) device.get("Name").getValue(),
 153                     (long) device.get("Created").getValue(),
 154                     (long) device.get("LastSeen").getValue(),
 155                     thisDevice.equals(d.getObjectPath()));
 156         }).collect(Collectors.toList());
 157     }
 158
 159     @Override
 160     public void removeLinkedDevices(final long deviceId) throws IOException {
 161         final var devicePath = signal.getDevice(deviceId);
 162         getRemoteObject(devicePath, Signal.Device.class).removeDevice();
 163     }
 164
 165     @Override
 166     public void addDeviceLink(final URI linkUri) throws IOException, InvalidKeyException {
 167         signal.addDevice(linkUri.toString());
 168     }
 169
 170     @Override
 171     public void setRegistrationLockPin(final Optional<String> pin) throws IOException, UnauthenticatedResponseException {
 172         if (pin.isPresent()) {
 173             signal.setPin(pin.get());
 174         } else {
 175             signal.removePin();
 176         }
 177     }
 178
 179     @Override
 180     public Profile getRecipientProfile(final RecipientIdentifier.Single recipient) throws UnregisteredUserException {
 181         throw new UnsupportedOperationException();
 182     }
 183
 184     @Override
 185     public List<Group> getGroups() {
 186         final var groups = signal.listGroups();
 187         return groups.stream().map(Signal.StructGroup::getObjectPath).map(this::getGroup).collect(Collectors.toList());
 188     }
 189
 190     @Override
 191     public SendGroupMessageResults quitGroup(
 192             final GroupId groupId, final Set<RecipientIdentifier.Single> groupAdmins
 193     ) throws GroupNotFoundException, IOException, NotAGroupMemberException, LastGroupAdminException {
 194         if (groupAdmins.size() > 0) {
 195             throw new UnsupportedOperationException();
 196         }
 197         final var group = getRemoteObject(signal.getGroup(groupId.serialize()), Signal.Group.class);
 198         group.quitGroup();
 199         return new SendGroupMessageResults(0, List.of());
 200     }
 201
 202     @Override
 203     public void deleteGroup(final GroupId groupId) throws IOException {
 204         throw new UnsupportedOperationException();
 205     }
 206
 207     @Override
 208     public Pair<GroupId, SendGroupMessageResults> createGroup(
 209             final String name, final Set<RecipientIdentifier.Single> members, final File avatarFile
 210     ) throws IOException, AttachmentInvalidException {
 211         final var newGroupId = signal.createGroup(emptyIfNull(name),
 212                 members.stream().map(RecipientIdentifier.Single::getIdentifier).collect(Collectors.toList()),
 213                 avatarFile == null ? "" : avatarFile.getPath());
 214         return new Pair<>(GroupId.unknownVersion(newGroupId), new SendGroupMessageResults(0, List.of()));
 215     }
 216
 217     @Override
 218     public SendGroupMessageResults updateGroup(
 219             final GroupId groupId, final UpdateGroup updateGroup
 220     ) throws IOException, GroupNotFoundException, AttachmentInvalidException, NotAGroupMemberException, GroupSendingNotAllowedException {
 221         final var group = getRemoteObject(signal.getGroup(groupId.serialize()), Signal.Group.class);
 222         if (updateGroup.getName() != null) {
 223             group.Set("org.asamk.Signal.Group", "Name", updateGroup.getName());
 224         }
 225         if (updateGroup.getDescription() != null) {
 226             group.Set("org.asamk.Signal.Group", "Description", updateGroup.getDescription());
 227         }
 228         if (updateGroup.getAvatarFile() != null) {
 229             group.Set("org.asamk.Signal.Group",
 230                     "Avatar",
 231                     updateGroup.getAvatarFile() == null ? "" : updateGroup.getAvatarFile().getPath());
 232         }
 233         if (updateGroup.getExpirationTimer() != null) {
 234             group.Set("org.asamk.Signal.Group", "MessageExpirationTimer", updateGroup.getExpirationTimer());
 235         }
 236         if (updateGroup.getAddMemberPermission() != null) {
 237             group.Set("org.asamk.Signal.Group", "PermissionAddMember", updateGroup.getAddMemberPermission().name());
 238         }
 239         if (updateGroup.getEditDetailsPermission() != null) {
 240             group.Set("org.asamk.Signal.Group", "PermissionEditDetails", updateGroup.getEditDetailsPermission().name());
 241         }
 242         if (updateGroup.getIsAnnouncementGroup() != null) {
 243             group.Set("org.asamk.Signal.Group",
 244                     "PermissionSendMessage",
 245                     updateGroup.getIsAnnouncementGroup()
 246                             ? GroupPermission.ONLY_ADMINS.name()
 247                             : GroupPermission.EVERY_MEMBER.name());
 248         }
 249         if (updateGroup.getMembers() != null) {
 250             group.addMembers(updateGroup.getMembers()
 251                     .stream()
 252                     .map(RecipientIdentifier.Single::getIdentifier)
 253                     .collect(Collectors.toList()));
 254         }
 255         if (updateGroup.getRemoveMembers() != null) {
 256             group.removeMembers(updateGroup.getRemoveMembers()
 257                     .stream()
 258                     .map(RecipientIdentifier.Single::getIdentifier)
 259                     .collect(Collectors.toList()));
 260         }
 261         if (updateGroup.getAdmins() != null) {
 262             group.addAdmins(updateGroup.getAdmins()
 263                     .stream()
 264                     .map(RecipientIdentifier.Single::getIdentifier)
 265                     .collect(Collectors.toList()));
 266         }
 267         if (updateGroup.getRemoveAdmins() != null) {
 268             group.removeAdmins(updateGroup.getRemoveAdmins()
 269                     .stream()
 270                     .map(RecipientIdentifier.Single::getIdentifier)
 271                     .collect(Collectors.toList()));
 272         }
 273         if (updateGroup.isResetGroupLink()) {
 274             group.resetLink();
 275         }
 276         if (updateGroup.getGroupLinkState() != null) {
 277             switch (updateGroup.getGroupLinkState()) {
 278                 case DISABLED:
 279                     group.disableLink();
 280                     break;
 281                 case ENABLED:
 282                     group.enableLink(false);
 283                     break;
 284                 case ENABLED_WITH_APPROVAL:
 285                     group.enableLink(true);
 286                     break;
 287             }
 288         }
 289         return new SendGroupMessageResults(0, List.of());
 290     }
 291
 292     @Override
 293     public Pair<GroupId, SendGroupMessageResults> joinGroup(final GroupInviteLinkUrl inviteLinkUrl) throws IOException, GroupLinkNotActiveException {
 294         final var newGroupId = signal.joinGroup(inviteLinkUrl.getUrl());
 295         return new Pair<>(GroupId.unknownVersion(newGroupId), new SendGroupMessageResults(0, List.of()));
 296     }
 297
 298     @Override
 299     public void sendTypingMessage(
 300             final TypingAction action, final Set<RecipientIdentifier> recipients
 301     ) throws IOException, UntrustedIdentityException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 302         for (final var recipient : recipients) {
 303             if (recipient instanceof RecipientIdentifier.Single) {
 304                 signal.sendTyping(((RecipientIdentifier.Single) recipient).getIdentifier(),
 305                         action == TypingAction.STOP);
 306             } else if (recipient instanceof RecipientIdentifier.Group) {
 307                 throw new UnsupportedOperationException();
 308             }
 309         }
 310     }
 311
 312     @Override
 313     public void sendReadReceipt(
 314             final RecipientIdentifier.Single sender, final List<Long> messageIds
 315     ) throws IOException, UntrustedIdentityException {
 316         signal.sendReadReceipt(sender.getIdentifier(), messageIds);
 317     }
 318
 319     @Override
 320     public void sendViewedReceipt(
 321             final RecipientIdentifier.Single sender, final List<Long> messageIds
 322     ) throws IOException, UntrustedIdentityException {
 323         throw new UnsupportedOperationException();
 324     }
 325
 326     @Override
 327     public SendMessageResults sendMessage(
 328             final Message message, final Set<RecipientIdentifier> recipients
 329     ) throws IOException, AttachmentInvalidException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 330         return handleMessage(recipients,
 331                 numbers -> signal.sendMessage(message.getMessageText(), message.getAttachments(), numbers),
 332                 () -> signal.sendNoteToSelfMessage(message.getMessageText(), message.getAttachments()),
 333                 groupId -> signal.sendGroupMessage(message.getMessageText(), message.getAttachments(), groupId));
 334     }
 335
 336     @Override
 337     public SendMessageResults sendRemoteDeleteMessage(
 338             final long targetSentTimestamp, final Set<RecipientIdentifier> recipients
 339     ) throws IOException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 340         return handleMessage(recipients,
 341                 numbers -> signal.sendRemoteDeleteMessage(targetSentTimestamp, numbers),
 342                 () -> signal.sendRemoteDeleteMessage(targetSentTimestamp, signal.getSelfNumber()),
 343                 groupId -> signal.sendGroupRemoteDeleteMessage(targetSentTimestamp, groupId));
 344     }
 345
 346     @Override
 347     public SendMessageResults sendMessageReaction(
 348             final String emoji,
 349             final boolean remove,
 350             final RecipientIdentifier.Single targetAuthor,
 351             final long targetSentTimestamp,
 352             final Set<RecipientIdentifier> recipients
 353     ) throws IOException, NotAGroupMemberException, GroupNotFoundException, GroupSendingNotAllowedException {
 354         return handleMessage(recipients,
 355                 numbers -> signal.sendMessageReaction(emoji,
 356                         remove,
 357                         targetAuthor.getIdentifier(),
 358                         targetSentTimestamp,
 359                         numbers),
 360                 () -> signal.sendMessageReaction(emoji,
 361                         remove,
 362                         targetAuthor.getIdentifier(),
 363                         targetSentTimestamp,
 364                         signal.getSelfNumber()),
 365                 groupId -> signal.sendGroupMessageReaction(emoji,
 366                         remove,
 367                         targetAuthor.getIdentifier(),
 368                         targetSentTimestamp,
 369                         groupId));
 370     }
 371
 372     @Override
 373     public SendMessageResults sendEndSessionMessage(final Set<RecipientIdentifier.Single> recipients) throws IOException {
 374         signal.sendEndSessionMessage(recipients.stream()
 375                 .map(RecipientIdentifier.Single::getIdentifier)
 376                 .collect(Collectors.toList()));
 377         return new SendMessageResults(0, Map.of());
 378     }
 379
 380     @Override
 381     public void setContactName(
 382             final RecipientIdentifier.Single recipient, final String name
 383     ) throws NotMasterDeviceException, UnregisteredUserException {
 384         signal.setContactName(recipient.getIdentifier(), name);
 385     }
 386
 387     @Override
 388     public void setContactBlocked(
 389             final RecipientIdentifier.Single recipient, final boolean blocked
 390     ) throws NotMasterDeviceException, IOException {
 391         signal.setContactBlocked(recipient.getIdentifier(), blocked);
 392     }
 393
 394     @Override
 395     public void setGroupBlocked(
 396             final GroupId groupId, final boolean blocked
 397     ) throws GroupNotFoundException, IOException {
 398         setGroupProperty(groupId, "IsBlocked", blocked);
 399     }
 400
 401     private void setGroupProperty(final GroupId groupId, final String propertyName, final boolean blocked) {
 402         final var group = getRemoteObject(signal.getGroup(groupId.serialize()), Signal.Group.class);
 403         group.Set("org.asamk.Signal.Group", propertyName, blocked);
 404     }
 405
 406     @Override
 407     public void setExpirationTimer(
 408             final RecipientIdentifier.Single recipient, final int messageExpirationTimer
 409     ) throws IOException {
 410         signal.setExpirationTimer(recipient.getIdentifier(), messageExpirationTimer);
 411     }
 412
 413     @Override
 414     public URI uploadStickerPack(final File path) throws IOException, StickerPackInvalidException {
 415         try {
 416             return new URI(signal.uploadStickerPack(path.getPath()));
 417         } catch (URISyntaxException e) {
 418             throw new AssertionError(e);
 419         }
 420     }
 421
 422     @Override
 423     public void requestAllSyncData() throws IOException {
 424         signal.sendSyncRequest();
 425     }
 426
 427     @Override
 428     public void receiveMessages(
 429             final long timeout,
 430             final TimeUnit unit,
 431             final boolean returnOnTimeout,
 432             final boolean ignoreAttachments,
 433             final ReceiveMessageHandler handler
 434     ) throws IOException {
 435         throw new UnsupportedOperationException();
 436     }
 437
 438     @Override
 439     public boolean hasCaughtUpWithOldMessages() {
 440         throw new UnsupportedOperationException();
 441     }
 442
 443     @Override
 444     public boolean isContactBlocked(final RecipientIdentifier.Single recipient) {
 445         return signal.isContactBlocked(recipient.getIdentifier());
 446     }
 447
 448     @Override
 449     public File getAttachmentFile(final SignalServiceAttachmentRemoteId attachmentId) {
 450         throw new UnsupportedOperationException();
 451     }
 452
 453     @Override
 454     public void sendContacts() throws IOException {
 455         signal.sendContacts();
 456     }
 457
 458     @Override
 459     public List<Pair<RecipientAddress, Contact>> getContacts() {
 460         throw new UnsupportedOperationException();
 461     }
 462
 463     @Override
 464     public String getContactOrProfileName(final RecipientIdentifier.Single recipient) {
 465         return signal.getContactName(recipient.getIdentifier());
 466     }
 467
 468     @Override
 469     public Group getGroup(final GroupId groupId) {
 470         final var groupPath = signal.getGroup(groupId.serialize());
 471         return getGroup(groupPath);
 472     }
 473
 474     @SuppressWarnings("unchecked")
 475     private Group getGroup(final DBusPath groupPath) {
 476         final var group = getRemoteObject(groupPath, Signal.Group.class).GetAll("org.asamk.Signal.Group");
 477         final var id = (byte[]) group.get("Id").getValue();
 478         try {
 479             return new Group(GroupId.unknownVersion(id),
 480                     (String) group.get("Name").getValue(),
 481                     (String) group.get("Description").getValue(),
 482                     GroupInviteLinkUrl.fromUri((String) group.get("GroupInviteLink").getValue()),
 483                     ((List<String>) group.get("Members").getValue()).stream()
 484                             .map(m -> new RecipientAddress(null, m))
 485                             .collect(Collectors.toSet()),
 486                     ((List<String>) group.get("PendingMembers").getValue()).stream()
 487                             .map(m -> new RecipientAddress(null, m))
 488                             .collect(Collectors.toSet()),
 489                     ((List<String>) group.get("RequestingMembers").getValue()).stream()
 490                             .map(m -> new RecipientAddress(null, m))
 491                             .collect(Collectors.toSet()),
 492                     ((List<String>) group.get("Admins").getValue()).stream()
 493                             .map(m -> new RecipientAddress(null, m))
 494                             .collect(Collectors.toSet()),
 495                     (boolean) group.get("IsBlocked").getValue(),
 496                     (int) group.get("MessageExpirationTimer").getValue(),
 497                     GroupPermission.valueOf((String) group.get("PermissionAddMember").getValue()),
 498                     GroupPermission.valueOf((String) group.get("PermissionEditDetails").getValue()),
 499                     GroupPermission.valueOf((String) group.get("PermissionSendMessage").getValue()),
 500                     (boolean) group.get("IsMember").getValue(),
 501                     (boolean) group.get("IsAdmin").getValue());
 502         } catch (GroupInviteLinkUrl.InvalidGroupLinkException | GroupInviteLinkUrl.UnknownGroupLinkVersionException e) {
 503             throw new AssertionError(e);
 504         }
 505     }
 506
 507     @Override
 508     public List<Identity> getIdentities() {
 509         throw new UnsupportedOperationException();
 510     }
 511
 512     @Override
 513     public List<Identity> getIdentities(final RecipientIdentifier.Single recipient) {
 514         throw new UnsupportedOperationException();
 515     }
 516
 517     @Override
 518     public boolean trustIdentityVerified(final RecipientIdentifier.Single recipient, final byte[] fingerprint) {
 519         throw new UnsupportedOperationException();
 520     }
 521
 522     @Override
 523     public boolean trustIdentityVerifiedSafetyNumber(
 524             final RecipientIdentifier.Single recipient, final String safetyNumber
 525     ) {
 526         throw new UnsupportedOperationException();
 527     }
 528
 529     @Override
 530     public boolean trustIdentityVerifiedSafetyNumber(
 531             final RecipientIdentifier.Single recipient, final byte[] safetyNumber
 532     ) {
 533         throw new UnsupportedOperationException();
 534     }
 535
 536     @Override
 537     public boolean trustIdentityAllKeys(final RecipientIdentifier.Single recipient) {
 538         throw new UnsupportedOperationException();
 539     }
 540
 541     @Override
 542     public String computeSafetyNumber(
 543             final SignalServiceAddress theirAddress, final IdentityKey theirIdentityKey
 544     ) {
 545         throw new UnsupportedOperationException();
 546     }
 547
 548     @Override
 549     public SignalServiceAddress resolveSignalServiceAddress(final SignalServiceAddress address) {
 550         return address;
 551     }
 552
 553     @Override
 554     public void close() throws IOException {
 555     }
 556
 557     private SendMessageResults handleMessage(
 558             Set<RecipientIdentifier> recipients,
 559             Function<List<String>, Long> recipientsHandler,
 560             Supplier<Long> noteToSelfHandler,
 561             Function<byte[], Long> groupHandler
 562     ) {
 563         long timestamp = 0;
 564         final var singleRecipients = recipients.stream()
 565                 .filter(r -> r instanceof RecipientIdentifier.Single)
 566                 .map(RecipientIdentifier.Single.class::cast)
 567                 .map(RecipientIdentifier.Single::getIdentifier)
 568                 .collect(Collectors.toList());
 569         if (singleRecipients.size() > 0) {
 570             timestamp = recipientsHandler.apply(singleRecipients);
 571         }
 572
 573         if (recipients.contains(RecipientIdentifier.NoteToSelf.INSTANCE)) {
 574             timestamp = noteToSelfHandler.get();
 575         }
 576         final var groupRecipients = recipients.stream()
 577                 .filter(r -> r instanceof RecipientIdentifier.Group)
 578                 .map(RecipientIdentifier.Group.class::cast)
 579                 .map(g -> g.groupId)
 580                 .collect(Collectors.toList());
 581         for (final var groupId : groupRecipients) {
 582             timestamp = groupHandler.apply(groupId.serialize());
 583         }
 584         return new SendMessageResults(timestamp, Map.of());
 585     }
 586
 587     private String emptyIfNull(final String string) {
 588         return string == null ? "" : string;
 589     }
 590
 591     private <T extends DBusInterface> T getRemoteObject(final DBusPath devicePath, final Class<T> type) {
 592         try {
 593             return connection.getRemoteObject(DbusConfig.getBusname(), devicePath.getPath(), type);
 594         } catch (DBusException e) {
 595             throw new AssertionError(e);
 596         }
 597     }
 598 }