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module Erebos.State (
LocalState(..),
SharedState, SharedType(..),
SharedTypeID, mkSharedTypeID,
MonadHead(..),
updateLocalHead_,
loadLocalStateHead,
updateSharedState, updateSharedState_,
lookupSharedValue, makeSharedStateUpdate,
localIdentity,
headLocalIdentity,
mergeSharedIdentity,
updateSharedIdentity,
interactiveIdentityUpdate,
) where
import Control.Monad.Except
import Control.Monad.Reader
import Data.Foldable
import Data.Maybe
import qualified Data.Text as T
import qualified Data.Text.IO as T
import Data.Typeable
import Data.UUID (UUID)
import qualified Data.UUID as U
import System.IO
import Erebos.Identity
import Erebos.PubKey
import Erebos.Storage
import Erebos.Storage.Merge
data LocalState = LocalState
{ lsIdentity :: Stored (Signed ExtendedIdentityData)
, lsShared :: [Stored SharedState]
}
data SharedState = SharedState
{ ssPrev :: [Stored SharedState]
, ssType :: Maybe SharedTypeID
, ssValue :: [Ref]
}
newtype SharedTypeID = SharedTypeID UUID
deriving (Eq, Ord, StorableUUID)
mkSharedTypeID :: String -> SharedTypeID
mkSharedTypeID = maybe (error "Invalid shared type ID") SharedTypeID . U.fromString
class Mergeable a => SharedType a where
sharedTypeID :: proxy a -> SharedTypeID
instance Storable LocalState where
store' st = storeRec $ do
storeRef "id" $ lsIdentity st
mapM_ (storeRef "shared") $ lsShared st
load' = loadRec $ LocalState
<$> loadRef "id"
<*> loadRefs "shared"
instance HeadType LocalState where
headTypeID _ = mkHeadTypeID "1d7491a9-7bcb-4eaa-8f13-c8c4c4087e4e"
instance Storable SharedState where
store' st = storeRec $ do
mapM_ (storeRef "PREV") $ ssPrev st
storeMbUUID "type" $ ssType st
mapM_ (storeRawRef "value") $ ssValue st
load' = loadRec $ SharedState
<$> loadRefs "PREV"
<*> loadMbUUID "type"
<*> loadRawRefs "value"
instance SharedType (Maybe ComposedIdentity) where
sharedTypeID _ = mkSharedTypeID "0c6c1fe0-f2d7-4891-926b-c332449f7871"
class (MonadIO m, MonadStorage m) => MonadHead a m where
updateLocalHead :: (Stored a -> m (Stored a, b)) -> m b
getLocalHead :: m (Stored a)
getLocalHead = updateLocalHead $ \x -> return (x, x)
updateLocalHead_ :: MonadHead a m => (Stored a -> m (Stored a)) -> m ()
updateLocalHead_ f = updateLocalHead (fmap (,()) . f)
instance (HeadType a, MonadIO m) => MonadHead a (ReaderT (Head a) m) where
updateLocalHead f = do
h <- ask
snd <$> updateHead h f
loadLocalStateHead :: MonadIO m => Storage -> m (Head LocalState)
loadLocalStateHead st = loadHeads st >>= \case
(h:_) -> return h
[] -> liftIO $ do
putStr "Name: "
hFlush stdout
name <- T.getLine
putStr "Device: "
hFlush stdout
devName <- T.getLine
owner <- if
| T.null name -> return Nothing
| otherwise -> Just <$> createIdentity st (Just name) Nothing
identity <- createIdentity st (if T.null devName then Nothing else Just devName) owner
shared <- wrappedStore st $ SharedState
{ ssPrev = []
, ssType = Just $ sharedTypeID @(Maybe ComposedIdentity) Proxy
, ssValue = [storedRef $ idExtData $ fromMaybe identity owner]
}
storeHead st $ LocalState
{ lsIdentity = idExtData identity
, lsShared = [shared]
}
localIdentity :: LocalState -> UnifiedIdentity
localIdentity ls = maybe (error "failed to verify local identity")
(updateOwners $ maybe [] idExtDataF $ lookupSharedValue $ lsShared ls)
(validateExtendedIdentity $ lsIdentity ls)
headLocalIdentity :: Head LocalState -> UnifiedIdentity
headLocalIdentity = localIdentity . headObject
updateSharedState_ :: forall a m. (SharedType a, MonadHead LocalState m) => (a -> m a) -> Stored LocalState -> m (Stored LocalState)
updateSharedState_ f = fmap fst <$> updateSharedState (fmap (,()) . f)
updateSharedState :: forall a b m. (SharedType a, MonadHead LocalState m) => (a -> m (a, b)) -> Stored LocalState -> m (Stored LocalState, b)
updateSharedState f = \ls -> do
let shared = lsShared $ fromStored ls
val = lookupSharedValue shared
st <- getStorage
(val', x) <- f val
(,x) <$> if toComponents val' == toComponents val
then return ls
else do shared' <- makeSharedStateUpdate st val' shared
wrappedStore st (fromStored ls) { lsShared = [shared'] }
lookupSharedValue :: forall a. SharedType a => [Stored SharedState] -> a
lookupSharedValue = mergeSorted . filterAncestors . map wrappedLoad . concatMap (ssValue . fromStored) . filterAncestors . helper
where helper (x:xs) | Just sid <- ssType (fromStored x), sid == sharedTypeID @a Proxy = x : helper xs
| otherwise = helper $ ssPrev (fromStored x) ++ xs
helper [] = []
makeSharedStateUpdate :: forall a m. MonadIO m => SharedType a => Storage -> a -> [Stored SharedState] -> m (Stored SharedState)
makeSharedStateUpdate st val prev = liftIO $ wrappedStore st SharedState
{ ssPrev = prev
, ssType = Just $ sharedTypeID @a Proxy
, ssValue = storedRef <$> toComponents val
}
mergeSharedIdentity :: (MonadHead LocalState m, MonadError String m) => m UnifiedIdentity
mergeSharedIdentity = updateLocalHead $ updateSharedState $ \case
Just cidentity -> do
identity <- mergeIdentity cidentity
return (Just $ toComposedIdentity identity, identity)
Nothing -> throwError "no existing shared identity"
updateSharedIdentity :: (MonadHead LocalState m, MonadError String m) => m ()
updateSharedIdentity = updateLocalHead_ $ updateSharedState_ $ \case
Just identity -> do
Just . toComposedIdentity <$> interactiveIdentityUpdate identity
Nothing -> throwError "no existing shared identity"
interactiveIdentityUpdate :: (Foldable f, MonadStorage m, MonadIO m, MonadError String m) => Identity f -> m UnifiedIdentity
interactiveIdentityUpdate identity = do
let public = idKeyIdentity identity
name <- liftIO $ do
T.putStr $ T.concat $ concat
[ [ T.pack "Name" ]
, case idName identity of
Just name -> [T.pack " [", name, T.pack "]"]
Nothing -> []
, [ T.pack ": " ]
]
hFlush stdout
T.getLine
if | T.null name -> mergeIdentity identity
| otherwise -> do
secret <- loadKey public
maybe (throwError "created invalid identity") return . validateIdentity =<<
mstore =<< sign secret =<< mstore (emptyIdentityData public)
{ iddPrev = toList $ idDataF identity
, iddName = Just name
}
|