signal-desktop/protos/Backups.proto

// Copyright 2024 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

syntax = "proto3";

package signalbackups;

option java_package = "org.thoughtcrime.securesms.backup.v2.proto";

message BackupInfo {
  uint64 version = 1;
  uint64 backupTimeMs = 2;
}

message Frame {
  oneof item {
    AccountData account = 1;
    Recipient recipient = 2;
    Chat chat = 3;
    ChatItem chatItem = 4;
    Call call = 5;
    StickerPack stickerPack = 6;
  }
}

message AccountData {
  enum PhoneNumberSharingMode {
    UNKNOWN = 0;
    EVERYBODY = 1;
    NOBODY = 2;
  }
  message UsernameLink {
    enum Color {
      UNKNOWN = 0;
      BLUE = 1;
      WHITE = 2;
      GREY = 3;
      OLIVE = 4;
      GREEN = 5;
      ORANGE = 6;
      PINK = 7;
      PURPLE = 8;
    }

    bytes entropy = 1;  // 32 bytes of entropy used for encryption
    bytes serverId = 2; // 16 bytes of encoded UUID provided by the server
    Color color = 3;
  }

  message AccountSettings {
    bool readReceipts = 1;
    bool sealedSenderIndicators = 2;
    bool typingIndicators = 3;
    bool linkPreviews = 4;
    bool notDiscoverableByPhoneNumber = 5;
    bool preferContactAvatars = 6;
    uint32 universalExpireTimer = 7; // 0 means no universal expire timer.
    repeated string preferredReactionEmoji = 8;
    bool displayBadgesOnProfile = 9;
    bool keepMutedChatsArchived = 10;
    bool hasSetMyStoriesPrivacy = 11;
    bool hasViewedOnboardingStory = 12;
    bool storiesDisabled = 13;
    optional bool storyViewReceiptsEnabled = 14;
    bool hasSeenGroupStoryEducationSheet = 15;
    bool hasCompletedUsernameOnboarding = 16;
    PhoneNumberSharingMode phoneNumberSharingMode = 17;
  }

  bytes profileKey = 1;
  optional string username = 2;
  UsernameLink usernameLink = 3;
  string givenName = 4;
  string familyName = 5;
  string avatarUrlPath = 6;
  bytes subscriberId = 7;
  string subscriberCurrencyCode = 8;
  bool subscriptionManuallyCancelled = 9;
  AccountSettings accountSettings = 10;
}

message Recipient {
  uint64 id = 1; // generated id for reference only within this file
  oneof destination {
    Contact contact = 2;
    Group group = 3;
    DistributionList distributionList = 4;
    Self self = 5;
    ReleaseNotes releaseNotes = 6;
  }
}

message Contact {
  enum Registered {
    UNKNOWN = 0;
    REGISTERED = 1;
    NOT_REGISTERED = 2;
  }

  optional bytes aci = 1; // should be 16 bytes
  optional bytes pni = 2; // should be 16 bytes
  optional string username = 3;
  optional uint64 e164 = 4;
  bool blocked = 5;
  bool hidden = 6;
  Registered registered = 7;
  uint64 unregisteredTimestamp = 8;
  optional bytes profileKey = 9;
  bool profileSharing = 10;
  optional string profileGivenName = 11;
  optional string profileFamilyName = 12;
  bool hideStory = 13;
}

message Group {
  enum StorySendMode {
    DEFAULT = 0;
    DISABLED = 1;
    ENABLED = 2;
  }

  bytes masterKey = 1;
  bool whitelisted = 2;
  bool hideStory = 3;
  StorySendMode storySendMode = 4;
  string name = 5;
}

message Self {}

message ReleaseNotes {}

message Chat {
  uint64 id = 1; // generated id for reference only within this file
  uint64 recipientId = 2;
  bool archived = 3;
  uint32 pinnedOrder = 4; // 0 = unpinned, otherwise chat is considered pinned and will be displayed in ascending order
  uint64 expirationTimerMs = 5; // 0 = no expire timer.
  uint64 muteUntilMs = 6;
  bool markedUnread = 7;
  bool dontNotifyForMentionsIfMuted = 8;
  FilePointer wallpaper = 9;
}

message DistributionList {
  enum PrivacyMode {
    UNKNOWN = 0;
    ONLY_WITH = 1;
    ALL_EXCEPT = 2;
    ALL = 3;
  }

  string name = 1;
  bytes distributionId = 2; // distribution list ids are uuids
  bool allowReplies = 3;
  uint64 deletionTimestamp = 4;
  PrivacyMode privacyMode = 5;
  repeated uint64 memberRecipientIds = 6; // generated recipient id
}

message Identity {
  bytes serviceId = 1;
  bytes identityKey = 2;
  uint64 timestamp = 3;
  bool firstUse = 4;
  bool verified = 5;
  bool nonblockingApproval = 6;
}

message Call {
  enum Type {
    UNKNOWN_TYPE = 0;
    AUDIO_CALL = 1;
    VIDEO_CALL = 2;
    GROUP_CALL = 3;
    AD_HOC_CALL = 4;
  }

  enum State {
    UNKNOWN_EVENT = 0;
    COMPLETED = 1; // A call that was successfully completed or was accepted and in-progress at the time of the backup.
    DECLINED_BY_USER = 2; // An incoming call that was manually declined by the user.
    DECLINED_BY_NOTIFICATION_PROFILE = 3; // An incoming call that was automatically declined by an active notification profile.
    MISSED = 4; // An incoming call that either expired, was cancelled by the sender, or was auto-rejected due to already being in a different call.
  }

  uint64 callId = 1;
  uint64 conversationRecipientId = 2;
  Type type = 3;
  bool outgoing = 4;
  uint64 timestamp = 5;
  optional uint64 ringerRecipientId = 6;
  State state = 7;
}

message ChatItem {
  message IncomingMessageDetails {
    uint64 dateReceived = 1;
    uint64 dateServerSent = 2;
    bool read = 3;
    bool sealedSender = 4;
  }

  message OutgoingMessageDetails {
    repeated SendStatus sendStatus = 1;
  }

  message DirectionlessMessageDetails {
  }

  uint64 chatId = 1;   // conversation id
  uint64 authorId = 2; // recipient id
  uint64 dateSent = 3;
  optional uint64 expireStartDate = 4; // timestamp of when expiration timer started ticking down
  optional uint64 expiresInMs = 5; // how long timer of message is (ms)
  repeated ChatItem revisions = 6; // ordered from oldest to newest
  bool sms = 7;

  oneof directionalDetails {
    IncomingMessageDetails incoming = 8;
    OutgoingMessageDetails outgoing = 9;
    DirectionlessMessageDetails directionless = 10;
  }

  oneof item {
    StandardMessage standardMessage = 11;
    ContactMessage contactMessage = 12;
    StickerMessage stickerMessage = 13;
    RemoteDeletedMessage remoteDeletedMessage = 14;
    ChatUpdateMessage updateMessage = 15;
  }
}

message SendStatus {
  enum Status {
    UNKNOWN = 0;
    FAILED = 1;
    PENDING = 2;
    SENT = 3;
    DELIVERED = 4;
    READ = 5;
    VIEWED = 6;
    SKIPPED = 7; // e.g. user in group was blocked, so we skipped sending to them
  }

  uint64 recipientId = 1;
  Status deliveryStatus = 2;
  bool networkFailure = 3;
  bool identityKeyMismatch = 4;
  bool sealedSender = 5;
  uint64 lastStatusUpdateTimestamp = 6; // the time the status was last updated -- if from a receipt, it should be the sentTime of the receipt
}

message Text {
  string body = 1;
  repeated BodyRange bodyRanges = 2;
}

message StandardMessage {
  optional Quote quote = 1;
  optional Text text = 2;
  repeated MessageAttachment attachments = 3;
  repeated LinkPreview linkPreview = 4;
  optional FilePointer longText = 5;
  repeated Reaction reactions = 6;
}

message ContactMessage {
  repeated ContactAttachment contact = 1;
  repeated Reaction reactions = 2;
}

message ContactAttachment {
  message Name {
    optional string givenName = 1;
    optional string familyName = 2;
    optional string prefix = 3;
    optional string suffix = 4;
    optional string middleName = 5;
    optional string displayName = 6;
  }

  message Phone {
    enum Type {
      UNKNOWN = 0;
      HOME = 1;
      MOBILE = 2;
      WORK = 3;
      CUSTOM = 4;
    }

    optional string value = 1;
    optional Type type = 2;
    optional string label = 3;
  }

  message Email {
    enum Type {
      UNKNOWN = 0;
      HOME = 1;
      MOBILE = 2;
      WORK = 3;
      CUSTOM = 4;
    }

    optional string value = 1;
    optional Type type = 2;
    optional string label = 3;
  }

  message PostalAddress {
    enum Type {
      UNKNOWN = 0;
      HOME = 1;
      WORK = 2;
      CUSTOM = 3;
    }

    optional Type type = 1;
    optional string label = 2;
    optional string street = 3;
    optional string pobox = 4;
    optional string neighborhood = 5;
    optional string city = 6;
    optional string region = 7;
    optional string postcode = 8;
    optional string country = 9;
  }

  optional Name name = 1;
  repeated Phone number = 3;
  repeated Email email = 4;
  repeated PostalAddress address = 5;
  optional string avatarUrlPath = 6;
  optional string organization = 7;
}

message DocumentMessage {
  Text text = 1;
  FilePointer document = 2;
  repeated Reaction reactions = 3;
}

message StickerMessage {
  Sticker sticker = 1;
  repeated Reaction reactions = 2;
}

// Tombstone for remote delete
message RemoteDeletedMessage {}

message Sticker {
  bytes packId = 1;
  bytes packKey = 2;
  uint32 stickerId = 3;
  optional string emoji = 4;
  // Stickers are uploaded to be sent as attachments; we also
  // back them up as normal attachments when they are in messages.
  // DO NOT treat this as the definitive source of a sticker in
  // an installed StickerPack that shares the same packId.
  FilePointer data = 5;
}

message LinkPreview {
  string url = 1;
  optional string title = 2;
  optional FilePointer image = 3;
  optional string description = 4;
  optional uint64 date = 5;
}

// A FilePointer on a message that has additional
// metadata that applies only to message attachments.
message MessageAttachment {
  // Similar to SignalService.AttachmentPointer.Flags,
  // but explicitly mutually exclusive. Note the different raw values
  // (non-zero starting values are not supported in proto3.)
  enum Flag {
    NONE = 0;
    VOICE_MESSAGE = 1;
    BORDERLESS = 2;
    GIF = 3;
  }

  FilePointer pointer = 1;
  Flag flag = 2;
}

message FilePointer {
  // References attachments in the backup (media) storage tier.
  message BackupLocator {
    string mediaName = 1;
    uint32 cdnNumber = 2;
  }

  // References attachments in the transit storage tier.
  // May be downloaded or not when the backup is generated;
  // primarily for free-tier users who cannot copy the
  // attachments to the backup (media) storage tier.
  message AttachmentLocator {
    string cdnKey = 1;
    uint32 cdnNumber = 2;
    uint64 uploadTimestamp = 3;
  }

  // An attachment that was copied from the transit storage tier
  // to the backup (media) storage tier up without being downloaded.
  // Its MediaName should be generated as “{sender_aci}_{cdn_attachment_key}”,
  // but should eventually transition to a BackupLocator with mediaName
  // being the content hash once it is downloaded.
  message UndownloadedBackupLocator {
    bytes senderAci = 1;
    string cdnKey = 2;
    uint32 cdnNumber = 3;
  }

  oneof locator {
    BackupLocator backupLocator = 1;
    AttachmentLocator attachmentLocator= 2;
    UndownloadedBackupLocator undownloadedBackupLocator = 3;
  }

  optional bytes key = 5;
  optional string contentType = 6;
  // Size of fullsize decrypted media blob in bytes.
  // Can be ignored if unset/unavailable.
  optional uint32 size = 7;
  optional bytes incrementalMac = 8;
  optional uint32 incrementalMacChunkSize = 9;
  optional string fileName = 10;
  optional uint32 width = 11;
  optional uint32 height = 12;
  optional string caption = 13;
  optional string blurHash = 14;
}

message Quote {
  enum Type {
    UNKNOWN = 0;
    NORMAL = 1;
    GIFTBADGE = 2;
  }

  message QuotedAttachment {
    optional string contentType = 1;
    optional string fileName = 2;
    optional MessageAttachment thumbnail = 3;
  }

  optional uint64 targetSentTimestamp = 1; // null if the target message could not be found at time of quote insert
  uint64 authorId = 2;
  optional string text = 3;
  repeated QuotedAttachment attachments = 4;
  repeated BodyRange bodyRanges = 5;
  Type type = 6;
}

message BodyRange {
  enum Style {
    NONE = 0;
    BOLD = 1;
    ITALIC = 2;
    SPOILER = 3;
    STRIKETHROUGH = 4;
    MONOSPACE = 5;
  }

  optional uint32 start = 1;
  optional uint32 length = 2;

  oneof associatedValue {
    bytes mentionAci = 3;
    Style style = 4;
  }
}

message Reaction {
  string emoji = 1;
  uint64 authorId = 2;
  uint64 sentTimestamp = 3;
  optional uint64 receivedTimestamp = 4;
  uint64 sortOrder = 5; // A higher sort order means that a reaction is more recent
}

message ChatUpdateMessage {
  oneof update {
    SimpleChatUpdate simpleUpdate = 1;
    GroupChangeChatUpdate groupChange = 2;
    ExpirationTimerChatUpdate expirationTimerChange = 3;
    ProfileChangeChatUpdate profileChange = 4;
    ThreadMergeChatUpdate threadMerge = 5;
    SessionSwitchoverChatUpdate sessionSwitchover = 6;
    CallChatUpdate callingMessage = 7;
  }
}

message CallChatUpdate{
  oneof call {
    uint64 callId = 1; // maps to id of Call from call log
    IndividualCallChatUpdate callMessage = 2;
    GroupCallChatUpdate groupCall = 3;
  }
}

message IndividualCallChatUpdate {
  enum Type {
    UNKNOWN = 0;
    INCOMING_AUDIO_CALL = 1;
    INCOMING_VIDEO_CALL = 2;
    OUTGOING_AUDIO_CALL = 3;
    OUTGOING_VIDEO_CALL = 4;
    MISSED_INCOMING_AUDIO_CALL = 5;
    MISSED_INCOMING_VIDEO_CALL = 6;
    UNANSWERED_OUTGOING_AUDIO_CALL = 7;
    UNANSWERED_OUTGOING_VIDEO_CALL = 8;
  }

  Type type = 1;
}

message GroupCallChatUpdate {
  optional bytes startedCallAci = 1;
  uint64 startedCallTimestamp = 2;
  repeated bytes inCallAcis = 3;
}

message SimpleChatUpdate {
  enum Type {
    UNKNOWN = 0;
    JOINED_SIGNAL = 1;
    IDENTITY_UPDATE = 2;
    IDENTITY_VERIFIED = 3;
    IDENTITY_DEFAULT = 4; // marking as unverified
    CHANGE_NUMBER = 5;
    BOOST_REQUEST = 6;
    END_SESSION = 7;
    CHAT_SESSION_REFRESH = 8;
    BAD_DECRYPT = 9;
    PAYMENTS_ACTIVATED = 10;
    PAYMENT_ACTIVATION_REQUEST = 11;
  }

  Type type = 1;
}

// For 1:1 chat updates only.
// For group thread updates use GroupExpirationTimerUpdate.
message ExpirationTimerChatUpdate {
  uint32 expiresInMs = 1; // 0 means the expiration timer was disabled
}

message ProfileChangeChatUpdate {
  string previousName = 1;
  string newName = 2;
}

message ThreadMergeChatUpdate {
  uint64 previousE164 = 1;
}

message SessionSwitchoverChatUpdate {
  uint64 e164 = 1;
}

message GroupChangeChatUpdate {
  message Update {
    // Note: group expiration timer changes are represented as ExpirationTimerChatUpdate.
    oneof update {
      GenericGroupUpdate genericGroupUpdate = 1;
      GroupCreationUpdate groupCreationUpdate = 2;
      GroupNameUpdate groupNameUpdate = 3;
      GroupAvatarUpdate groupAvatarUpdate = 4;
      GroupDescriptionUpdate groupDescriptionUpdate = 5;
      GroupMembershipAccessLevelChangeUpdate groupMembershipAccessLevelChangeUpdate = 6;
      GroupAttributesAccessLevelChangeUpdate groupAttributesAccessLevelChangeUpdate = 7;
      GroupAnnouncementOnlyChangeUpdate groupAnnouncementOnlyChangeUpdate = 8;
      GroupAdminStatusUpdate groupAdminStatusUpdate = 9;
      GroupMemberLeftUpdate groupMemberLeftUpdate = 10;
      GroupMemberRemovedUpdate groupMemberRemovedUpdate = 11;
      SelfInvitedToGroupUpdate selfInvitedToGroupUpdate = 12;
      SelfInvitedOtherUserToGroupUpdate selfInvitedOtherUserToGroupUpdate = 13;
      GroupUnknownInviteeUpdate groupUnknownInviteeUpdate = 14;
      GroupInvitationAcceptedUpdate groupInvitationAcceptedUpdate = 15;
      GroupInvitationDeclinedUpdate groupInvitationDeclinedUpdate = 16;
      GroupMemberJoinedUpdate groupMemberJoinedUpdate = 17;
      GroupMemberAddedUpdate groupMemberAddedUpdate = 18;
      GroupSelfInvitationRevokedUpdate groupSelfInvitationRevokedUpdate = 19;
      GroupInvitationRevokedUpdate groupInvitationRevokedUpdate = 20;
      GroupJoinRequestUpdate groupJoinRequestUpdate = 21;
      GroupJoinRequestApprovalUpdate groupJoinRequestApprovalUpdate = 22;
      GroupJoinRequestCanceledUpdate groupJoinRequestCanceledUpdate = 23;
      GroupInviteLinkResetUpdate groupInviteLinkResetUpdate = 24;
      GroupInviteLinkEnabledUpdate groupInviteLinkEnabledUpdate = 25;
      GroupInviteLinkAdminApprovalUpdate groupInviteLinkAdminApprovalUpdate = 26;
      GroupInviteLinkDisabledUpdate groupInviteLinkDisabledUpdate = 27;
      GroupMemberJoinedByLinkUpdate groupMemberJoinedByLinkUpdate = 28;
      GroupV2MigrationUpdate groupV2MigrationUpdate = 29;
      GroupV2MigrationSelfInvitedUpdate groupV2MigrationSelfInvitedUpdate = 30;
      GroupV2MigrationInvitedMembersUpdate groupV2MigrationInvitedMembersUpdate = 31;
      GroupV2MigrationDroppedMembersUpdate groupV2MigrationDroppedMembersUpdate = 32;
      GroupSequenceOfRequestsAndCancelsUpdate groupSequenceOfRequestsAndCancelsUpdate = 33;
      GroupExpirationTimerUpdate groupExpirationTimerUpdate = 34;
    }
  }

  // Must be one or more; all updates batched together came from
  // a single batched group state update.
  repeated Update updates = 1;
}

message GenericGroupUpdate {
  optional bytes updaterAci = 1;
}

message GroupCreationUpdate {
  optional bytes updaterAci = 1;
}

message GroupNameUpdate {
  optional bytes updaterAci = 1;
  // Null value means the group name was removed.
  optional string newGroupName = 2;
}

message GroupAvatarUpdate {
  optional bytes updaterAci = 1;
  bool wasRemoved = 2;
}

message GroupDescriptionUpdate {
  optional bytes updaterAci = 1;
  // Null value means the group description was removed.
  optional string newDescription = 2;
}

enum GroupV2AccessLevel {
  UNKNOWN = 0;
  ANY = 1;
  MEMBER = 2;
  ADMINISTRATOR = 3;
  UNSATISFIABLE = 4;
}

message GroupMembershipAccessLevelChangeUpdate {
  optional bytes updaterAci = 1;
  GroupV2AccessLevel accessLevel = 2;
}

message GroupAttributesAccessLevelChangeUpdate {
  optional bytes updaterAci = 1;
  GroupV2AccessLevel accessLevel = 2;
}

message GroupAnnouncementOnlyChangeUpdate {
  optional bytes updaterAci = 1;
  bool isAnnouncementOnly = 2;
}

message GroupAdminStatusUpdate {
  optional bytes updaterAci = 1;
  // The aci who had admin status granted or revoked.
  bytes memberAci = 2;
  bool wasAdminStatusGranted = 3;
}

message GroupMemberLeftUpdate {
  bytes aci = 1;
}

message GroupMemberRemovedUpdate {
  optional bytes removerAci = 1;
  bytes removedAci = 2;
}

message SelfInvitedToGroupUpdate {
  optional bytes inviterAci = 1;
}

message SelfInvitedOtherUserToGroupUpdate {
  // If no invitee id available, use GroupUnknownInviteeUpdate
  bytes inviteeServiceId = 1;
}

message GroupUnknownInviteeUpdate {
  // Can be the self user.
  optional bytes inviterAci = 1;
  uint32 inviteeCount = 2;
}

message GroupInvitationAcceptedUpdate {
  optional bytes inviterAci = 1;
  bytes newMemberAci = 2;
}

message GroupInvitationDeclinedUpdate {
  optional bytes inviterAci = 1;
  // Note: if invited by pni, just set inviteeAci to nil.
  optional bytes inviteeAci = 2;
}

message GroupMemberJoinedUpdate {
  bytes newMemberAci = 1;
}

message GroupMemberAddedUpdate {
  optional bytes updaterAci = 1;
  bytes newMemberAci = 2;
  bool hadOpenInvitation = 3;
  // If hadOpenInvitation is true, optionally include aci of the inviter.
  optional bytes inviterAci = 4;
}

// An invitation to self was revoked.
message GroupSelfInvitationRevokedUpdate {
  optional bytes revokerAci = 1;
}

// These invitees should never be the local user.
// Use GroupSelfInvitationRevokedUpdate in those cases.
// The inviter or updater can be the local user.
message GroupInvitationRevokedUpdate {
  message Invitee {
    optional bytes inviterAci = 1;
    // Prefer to use aci over pni. No need to set
    // pni if aci is set. Both can be missing.
    optional bytes inviteeAci = 2;
    optional bytes inviteePni = 3;
  }

  // The member that revoked the invite(s), not the inviter!
  // Assumed to be an admin (at the time, may no longer be an
  // admin or even a member).
  optional bytes updaterAci = 1;
  repeated Invitee invitees = 2;
}

message GroupJoinRequestUpdate {
  bytes requestorAci = 1;
}

message GroupJoinRequestApprovalUpdate {
  bytes requestorAci = 1;
  // The aci that approved or rejected the request.
  optional bytes updaterAci = 2;
  bool wasApproved = 3;
}

message GroupJoinRequestCanceledUpdate {
  bytes requestorAci = 1;
}

// A single requestor has requested to join and cancelled
// their request repeatedly with no other updates in between.
// The last action encompassed by this update is always a
// cancellation; if there was another open request immediately
// after, it will be a separate GroupJoinRequestUpdate, either
// in the same frame or in a subsequent frame.
message GroupSequenceOfRequestsAndCancelsUpdate {
  bytes requestorAci = 1;
  uint32 count = 2;
}

message GroupInviteLinkResetUpdate {
  optional bytes updaterAci = 1;
}

message GroupInviteLinkEnabledUpdate {
  optional bytes updaterAci = 1;
  bool linkRequiresAdminApproval = 2;
}

message GroupInviteLinkAdminApprovalUpdate {
  optional bytes updaterAci = 1;
  bool linkRequiresAdminApproval = 2;
}

message GroupInviteLinkDisabledUpdate {
  optional bytes updaterAci = 1;
}

message GroupMemberJoinedByLinkUpdate {
  bytes newMemberAci = 1;
}

// A gv1->gv2 migration occurred.
message GroupV2MigrationUpdate  {}

// Another user migrated gv1->gv2 but was unable to add
// the local user and invited them instead.
message GroupV2MigrationSelfInvitedUpdate {}

// The local user migrated gv1->gv2 but was unable to
// add some members and invited them instead.
// (Happens if we don't have the invitee's profile key)
message GroupV2MigrationInvitedMembersUpdate {
  uint32 invitedMembersCount = 1;
}

// The local user migrated gv1->gv2 but was unable to
// add or invite some members and dropped them instead.
// (Happens for e164 members where we don't have an aci).
message GroupV2MigrationDroppedMembersUpdate {
  uint32 droppedMembersCount = 1;
}

// For 1:1 timer updates, use ExpirationTimerChatUpdate.
message GroupExpirationTimerUpdate {
  uint32 expiresInMs = 1; // 0 means the expiration timer was disabled
  optional bytes updaterAci = 2;
}

message StickerPack {
  bytes packId = 1;
  bytes packKey = 2;
  string title = 3;
  string author = 4;
  repeated StickerPackSticker stickers = 5; // First one should be cover sticker.
}

message StickerPackSticker {
  string emoji = 1;
  uint32 id = 2;
}