public void AcceptGroupInvite([FromBody] string messageId)
{
var userId = HttpContext.User.Id();
var message = _messageSource.GetMessageById(userId, messageId);
if (message == null || message.Type != "Group")
{
return;
}
var groupInvite = message as GroupInviteMessage;
var groupId = groupInvite.GroupId;
_groupSource.AddUser(groupId, userId);
var user = _userSource.Get(userId);
user.Groups.Add(groupId);
_userSource.Update(user);
_messageSource.DeleteMessage(userId, groupInvite.MessageId);
}