Groups.proto

syntax = "proto3";

package signalservice;

option java_package        = "org.whispersystems.signalservice.protos.groups";
option java_multiple_files = true;

message AvatarUploadAttributes {
  string key        = 1;
  string credential = 2;
  string acl        = 3;
  string algorithm  = 4;
  string date       = 5;
  string policy     = 6;
  string signature  = 7;
}

message Member {
  enum Role {
    UNKNOWN       = 0;
    DEFAULT       = 1; // Normal member
    ADMINISTRATOR = 2; // Group admin
  }

  bytes  userId          = 1; // The UuidCiphertext
  Role   role            = 2;
  bytes  profileKey      = 3; // The ProfileKeyCiphertext
  bytes  presentation    = 4; // ProfileKeyCredentialPresentation
  uint32 joinedAtVersion = 5; // The Group.version this member joined at
}

message PendingMember {
  Member member        = 1; // The “invited” member
  bytes  addedByUserId = 2; // The UID who invited this member
  uint64 timestamp     = 3; // The time the invitation occurred
}

message AccessControl {
  enum AccessRequired {
    UNKNOWN       = 0;
    MEMBER        = 2; // Any group member can make the modification
    ADMINISTRATOR = 3; // Only administrators can make the modification
  }

  AccessRequired attributes = 1; // Who can modify the group title, avatar, disappearing messages timer
  AccessRequired members    = 2; // Who can add people to the group
}

message Group {
           bytes         publicKey                 = 1; // GroupPublicParams
           bytes         title                     = 2; // Encrypted title
           string        avatar                    = 3; // Pointer to encrypted avatar (‘key’ from AvatarUploadAttributes)
           bytes         disappearingMessagesTimer = 4; // Encrypted timer
           AccessControl accessControl             = 5;
           uint32        version                   = 6; // Current group version number
  repeated Member        members                   = 7;
  repeated PendingMember pendingMembers            = 8;
}

message GroupChange {

  message Actions {

    message AddMemberAction {
      Member added = 1;
    }

    message DeleteMemberAction {
      bytes deletedUserId = 1;
    }

    message ModifyMemberRoleAction {
      bytes       userId = 1;
      Member.Role role   = 2;
    }

    message ModifyMemberProfileKeyAction {
      bytes presentation = 1;
    }

    message AddPendingMemberAction {
      PendingMember added = 1;
    }

    message DeletePendingMemberAction {
      bytes deletedUserId = 1;
    }

    message PromotePendingMemberAction {
      bytes presentation = 1;
    }

    message ModifyTitleAction {
      bytes title = 1;
    }

    message ModifyAvatarAction {
      string avatar = 1;
    }

    message ModifyDisappearingMessagesTimerAction {
      bytes timer = 1;
    }

    message ModifyAttributesAccessControlAction {
      AccessControl.AccessRequired attributesAccess = 1;
    }

    message ModifyAvatarAccessControlAction {
      AccessControl.AccessRequired avatarAccess = 1;
    }

    message ModifyMembersAccessControlAction {
      AccessControl.AccessRequired membersAccess = 1;
    }

             bytes                                 sourceUuid                      = 1; // Who made the change
             uint32                                version                         = 2; // The change version number
    repeated AddMemberAction                       addMembers                      = 3; // Members added
    repeated DeleteMemberAction                    deleteMembers                   = 4; // Members deleted
    repeated ModifyMemberRoleAction                modifyMemberRoles               = 5; // Modified member roles
    repeated ModifyMemberProfileKeyAction          modifyMemberProfileKeys         = 6; // Modified member profile keys
    repeated AddPendingMemberAction                addPendingMembers               = 7; // Pending members added
    repeated DeletePendingMemberAction             deletePendingMembers            = 8; // Pending members deleted
    repeated PromotePendingMemberAction            promotePendingMembers           = 9; // Pending invitations accepted
             ModifyTitleAction                     modifyTitle                     = 10; // Changed title
             ModifyAvatarAction                    modifyAvatar                    = 11; // Changed avatar
             ModifyDisappearingMessagesTimerAction modifyDisappearingMessagesTimer = 12; // Changed timer
             ModifyAttributesAccessControlAction   modifyAttributesAccess          = 13; // Changed attributes access control
             ModifyMembersAccessControlAction      modifyMemberAccess              = 14; // Changed membership access control
  }

  bytes  actions         = 1; // The serialized actions
  bytes  serverSignature = 2; // Server’s signature over serialized actions
  uint32 changeEpoch     = 3; // Allows clients to decide whether their change logic can successfully apply this diff
}

message GroupChanges {
  message GroupChangeState {
    GroupChange groupChange = 1;
    Group       groupState  = 2;
  }

  repeated GroupChangeState groupChanges = 1;
}

message GroupAttributeBlob {
  oneof content {
    string title                        = 1;
    bytes  avatar                       = 2;
    uint32 disappearingMessagesDuration = 3;
  }
}

message GroupExternalCredential {
  string token = 1;
}