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module State (
LocalState(..),
SharedState(..),
loadLocalState,
updateLocalState, updateLocalState_,
updateSharedState, updateSharedState_,
mergeSharedStates,
mergeSharedIdentity,
updateIdentity,
) where
import Data.List
import Data.Maybe
import qualified Data.Text as T
import qualified Data.Text.IO as T
import System.IO
import Identity
import Message
import PubKey
import Storage
import Util
data LocalState = LocalState
{ lsIdentity :: Stored (Signed IdentityData)
, lsShared :: [Stored SharedState]
, lsMessages :: StoredList DirectMessageThread -- TODO: move to shared
}
data SharedState = SharedState
{ ssPrev :: [Stored SharedState]
, ssIdentity :: [Stored (Signed IdentityData)]
}
instance Storable LocalState where
store' st = storeRec $ do
storeRef "id" $ lsIdentity st
mapM_ (storeRef "shared") $ lsShared st
storeRef "dmsg" $ lsMessages st
load' = loadRec $ LocalState
<$> loadRef "id"
<*> loadRefs "shared"
<*> loadRef "dmsg"
instance Storable SharedState where
store' st = storeRec $ do
mapM_ (storeRef "PREV") $ ssPrev st
mapM_ (storeRef "id") $ ssIdentity st
load' = loadRec $ SharedState
<$> loadRefs "PREV"
<*> loadRefs "id"
loadLocalState :: Storage -> IO Head
loadLocalState st = loadHeadDef st "erebos" $ do
putStr "Name: "
hFlush stdout
name <- T.getLine
putStr "Device: "
hFlush stdout
devName <- T.getLine
(owner, secret) <- if
| T.null name -> return (Nothing, Nothing)
| otherwise -> do
(secret, public) <- generateKeys st
(_secretMsg, publicMsg) <- generateKeys st
return . (, Just secret) . Just =<< wrappedStore st =<< sign secret =<<
wrappedStore st (emptyIdentityData public)
{ iddName = Just name, iddKeyMessage = Just publicMsg }
(devSecret, devPublic) <- generateKeys st
(_devSecretMsg, devPublicMsg) <- generateKeys st
identity <- wrappedStore st =<< maybe return signAdd secret =<< sign devSecret =<< wrappedStore st (emptyIdentityData devPublic)
{ iddName = if T.null devName then Nothing else Just devName
, iddOwner = owner
, iddKeyMessage = Just devPublicMsg
}
msgs <- emptySList st
shared <- wrappedStore st $ SharedState
{ ssPrev = []
, ssIdentity = [fromMaybe identity owner]
}
return $ LocalState
{ lsIdentity = identity
, lsShared = [shared]
, lsMessages = msgs
}
updateLocalState_ :: Storage -> (Stored LocalState -> IO (Stored LocalState)) -> IO ()
updateLocalState_ st f = updateLocalState st (fmap (,()) . f)
updateLocalState :: Storage -> (Stored LocalState -> IO (Stored LocalState, a)) -> IO a
updateLocalState ls f = do
Just erebosHead <- loadHead ls "erebos"
(st, x) <- f $ wrappedLoad (headRef erebosHead)
Right _ <- replaceHead st (Right erebosHead)
return x
updateSharedState_ :: Storage -> (Stored SharedState -> IO (Stored SharedState)) -> IO ()
updateSharedState_ st f = updateSharedState st (fmap (,()) . f)
updateSharedState :: Storage -> (Stored SharedState -> IO (Stored SharedState, a)) -> IO a
updateSharedState st f = updateLocalState st $ \ls -> do
(shared, x) <- f =<< mergeSharedStates (lsShared $ fromStored ls)
(,x) <$> wrappedStore st (fromStored ls) { lsShared = [shared] }
mergeSharedStates :: [(Stored SharedState)] -> IO (Stored SharedState)
mergeSharedStates [s] = return s
mergeSharedStates ss@(s:_) = wrappedStore (storedStorage s) $ SharedState
{ ssPrev = ss
, ssIdentity = uniq $ sort $ concatMap (ssIdentity . fromStored) $ ss -- TODO: ancestor elimination
}
mergeSharedStates [] = error "mergeSharedStates: empty list"
mergeSharedIdentity :: Storage -> IO UnifiedIdentity
mergeSharedIdentity st = updateSharedState st $ \sshared -> do
let shared = fromStored sshared
Just cidentity = verifyIdentityF $ ssIdentity shared
identity <- mergeIdentity cidentity
sshared' <- wrappedStore st $ shared { ssIdentity = [idData identity] }
return (sshared', identity)
updateIdentity :: Storage -> IO ()
updateIdentity st = updateSharedState_ st $ \sshared -> do
let shared = fromStored sshared
Just identity = verifyIdentityF $ ssIdentity shared
public = idKeyIdentity identity
T.putStr $ T.concat $ concat
[ [ T.pack "Name" ]
, case idName identity of
Just name -> [T.pack " [", name, T.pack "]"]
Nothing -> []
, [ T.pack ": " ]
]
hFlush stdout
name <- T.getLine
identity' <- if
| T.null name -> idData <$> mergeIdentity identity
| otherwise -> do
Just secret <- loadKey public
wrappedStore st =<< sign secret =<< wrappedStore st (emptyIdentityData public)
{ iddPrev = ssIdentity shared
, iddName = Just name
}
wrappedStore st shared { ssIdentity = [identity'] }
|