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{-# LANGUAGE NamedFieldPuns #-}
module Roster where
import Control.Concurrent.STM
import Control.Monad
import Crypto.PubKey.Curve25519
import qualified Data.HashMap.Strict as HashMap
;import Data.HashMap.Strict (HashMap)
import Data.Maybe
import Network.Tox.DHT.Transport as DHT
import Network.Tox.NodeId
import Network.Tox.Onion.Transport as Onion
import System.IO
newtype Roster = Roster { accounts :: TVar (HashMap NodeId Account) }
data Account = Account
{ userSecret :: SecretKey -- local secret key
, contacts :: TVar (HashMap NodeId Contact) -- received contact info
}
data Contact = Contact
{ contactKeyPacket :: Maybe (DHT.DHTPublicKey)
, contactFriendRequest :: Maybe (DHT.FriendRequest)
}
mergeContact :: Contact -> Maybe Contact -> Maybe Contact
mergeContact (Contact newk newf) (Just (Contact oldk oldf)) =
Just (Contact mergek mergef)
where
mergek = mplus oldk $ do
n <- newk
stamp <- fmap DHT.dhtpkNonce oldk `mplus` return minBound
guard (stamp <= DHT.dhtpkNonce n)
return n
mergef = mplus oldf newf
mergeContact new Nothing = Just new
newRoster :: IO Roster
newRoster = atomically $ Roster <$> newTVar HashMap.empty
newAccount :: SecretKey -> STM Account
newAccount sk = Account sk <$> newTVar HashMap.empty
addRoster :: Roster -> SecretKey -> STM ()
addRoster (Roster as) sk = do
a <- newAccount sk
modifyTVar' as $ HashMap.insert (key2id $ toPublic sk) a
delRoster :: Roster -> PublicKey -> STM ()
delRoster (Roster as) pk = modifyTVar' as $ HashMap.delete (key2id pk)
updateRoster :: Roster -> Onion.AnnouncedRendezvous -> (PublicKey,Onion.OnionData) -> IO ()
updateRoster roster Onion.AnnouncedRendezvous{remoteUserKey} (localUserKey,omsg) = do
hPutStrLn stderr "updateRoster!!!"
atomically $ do
as <- readTVar (accounts roster)
maybe (return ())
(updateAccount remoteUserKey omsg)
$ HashMap.lookup (key2id localUserKey) as
updateAccount :: PublicKey -> Onion.OnionData -> Account -> STM ()
updateAccount remoteUserKey (Onion.OnionDHTPublicKey dhtpk) acc = do
modifyTVar' (contacts acc) $ HashMap.alter (mergeContact $ Contact (Just dhtpk) Nothing)
(key2id remoteUserKey)
updateAccount remoteUserKey (Onion.OnionFriendRequest fr) acc = do
modifyTVar' (contacts acc) $ HashMap.alter (mergeContact $ Contact Nothing (Just fr))
(key2id remoteUserKey)
dnsPresentation :: Roster -> STM String
dnsPresentation (Roster accsvar) = do
accs <- readTVar accsvar
ms <- forM accs $ \Account { userSecret = sec, contacts = cvar } -> do
cs <- readTVar cvar
return $
"; local key = " ++ show (key2id $ toPublic sec) ++ "\n"
++ concatMap dnsPresentation1
(mapMaybe (\(nid,m) -> ((,) nid) <$> contactKeyPacket m)
$ HashMap.toList cs)
return $ concat ms
dnsPresentation1 :: (NodeId,DHTPublicKey) -> String
dnsPresentation1 (nid,dk) = unlines
[ concat [ show nid, ".tox. IN CNAME ", show (key2id $ dhtpk dk), ".dht." ]
]
type LocalKey = NodeId
type RemoteKey = NodeId
friendRequests :: Roster -> STM (HashMap LocalKey [(RemoteKey,DHT.FriendRequest)])
friendRequests (Roster roster) = do
accs <- readTVar roster
forM accs $ \Account { userSecret = sec, contacts = cvar } -> do
cs <- readTVar cvar
let remotes = mapMaybe (\(nid,m) -> ((,) nid) <$> contactFriendRequest m)
$ HashMap.toList cs
return remotes
|
