for (Entry<String, ConnectedTab> entry : collaborators) {
String userId = entry.getValue().loginInfo.userId;
String username = entry.getValue().loginInfo.username;
ParticipantUserDetailsImpl participantDetails = ParticipantUserDetailsImpl.make();
ParticipantImpl participant = ParticipantImpl.make().setId(entry.getKey()).setUserId(userId);
UserDetailsImpl userDetails = UserDetailsImpl.make()
.setUserId(userId).setDisplayEmail(username).setDisplayName(username)
.setGivenName(username);
participantDetails.setParticipant(participant);
participantDetails.setUserDetails(userDetails);