module Network.QUIC.Packet.Token (
    CryptoToken (..),
    isRetryToken,
    generateToken,
    generateRetryToken,
    encryptToken,
    decryptToken,
) where

import qualified Crypto.Token as CT
import Data.UnixTime
import Foreign.C.Types
import Foreign.Ptr
import Foreign.Storable
import Network.ByteOrder

import Network.QUIC.Imports
import Network.QUIC.Types

----------------------------------------------------------------

data CryptoToken = CryptoToken
    { CryptoToken -> Version
tokenQUICVersion :: Version
    , CryptoToken -> TimeMicrosecond
tokenCreatedTime :: TimeMicrosecond
    , CryptoToken -> Maybe (CID, CID, CID)
tokenCIDs :: Maybe (CID, CID, CID) -- local, remote, orig local
    }

isRetryToken :: CryptoToken -> Bool
isRetryToken :: CryptoToken -> Bool
isRetryToken CryptoToken
token = forall a. Maybe a -> Bool
isJust forall a b. (a -> b) -> a -> b
$ CryptoToken -> Maybe (CID, CID, CID)
tokenCIDs CryptoToken
token

----------------------------------------------------------------

generateToken :: Version -> IO CryptoToken
generateToken :: Version -> IO CryptoToken
generateToken Version
ver = do
    TimeMicrosecond
t <- IO TimeMicrosecond
getTimeMicrosecond
    forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ Version -> TimeMicrosecond -> Maybe (CID, CID, CID) -> CryptoToken
CryptoToken Version
ver TimeMicrosecond
t forall a. Maybe a
Nothing

generateRetryToken :: Version -> CID -> CID -> CID -> IO CryptoToken
generateRetryToken :: Version -> CID -> CID -> CID -> IO CryptoToken
generateRetryToken Version
ver CID
l CID
r CID
o = do
    TimeMicrosecond
t <- IO TimeMicrosecond
getTimeMicrosecond
    forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ Version -> TimeMicrosecond -> Maybe (CID, CID, CID) -> CryptoToken
CryptoToken Version
ver TimeMicrosecond
t forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just (CID
l, CID
r, CID
o)

----------------------------------------------------------------

encryptToken :: CT.TokenManager -> CryptoToken -> IO Token
encryptToken :: TokenManager -> CryptoToken -> IO Token
encryptToken = forall a ba.
(Storable a, ByteArray ba) =>
TokenManager -> a -> IO ba
CT.encryptToken

decryptToken :: CT.TokenManager -> Token -> IO (Maybe CryptoToken)
decryptToken :: TokenManager -> Token -> IO (Maybe CryptoToken)
decryptToken = forall a ba.
(Storable a, ByteArray ba) =>
TokenManager -> ba -> IO (Maybe a)
CT.decryptToken

----------------------------------------------------------------

cryptoTokenSize :: Int
cryptoTokenSize :: Int
cryptoTokenSize = Int
76 -- 4 + 8 + 1 + (1 + 20) * 3

-- length includes its field
instance Storable CryptoToken where
    sizeOf :: CryptoToken -> Int
sizeOf ~CryptoToken
_ = Int
cryptoTokenSize
    alignment :: CryptoToken -> Int
alignment ~CryptoToken
_ = Int
4
    peek :: Ptr CryptoToken -> IO CryptoToken
peek Ptr CryptoToken
ptr = do
        ReadBuffer
rbuf <- Buffer -> Int -> IO ReadBuffer
newReadBuffer (forall a b. Ptr a -> Ptr b
castPtr Ptr CryptoToken
ptr) Int
cryptoTokenSize
        Version
ver <- Word32 -> Version
Version forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. Readable a => a -> IO Word32
read32 ReadBuffer
rbuf
        CTime
s <- Int64 -> CTime
CTime forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a b. (Integral a, Num b) => a -> b
fromIntegral forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. Readable a => a -> IO Word64
read64 ReadBuffer
rbuf
        let tim :: TimeMicrosecond
tim = CTime -> Int32 -> TimeMicrosecond
UnixTime CTime
s Int32
0
        Word8
typ <- forall a. Readable a => a -> IO Word8
read8 ReadBuffer
rbuf
        case Word8
typ of
            Word8
0 -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ Version -> TimeMicrosecond -> Maybe (CID, CID, CID) -> CryptoToken
CryptoToken Version
ver TimeMicrosecond
tim forall a. Maybe a
Nothing
            Word8
_ -> do
                CID
l <- forall {a}. Readable a => a -> IO CID
pick ReadBuffer
rbuf
                CID
r <- forall {a}. Readable a => a -> IO CID
pick ReadBuffer
rbuf
                CID
o <- forall {a}. Readable a => a -> IO CID
pick ReadBuffer
rbuf
                forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ Version -> TimeMicrosecond -> Maybe (CID, CID, CID) -> CryptoToken
CryptoToken Version
ver TimeMicrosecond
tim forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just (CID
l, CID
r, CID
o)
      where
        pick :: a -> IO CID
pick a
rbuf = do
            Int
xlen0 <- forall a b. (Integral a, Num b) => a -> b
fromIntegral forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. Readable a => a -> IO Word8
read8 a
rbuf
            let xlen :: Int
xlen = forall a. Ord a => a -> a -> a
min Int
xlen0 Int
20
            CID
x <- ShortByteString -> CID
makeCID forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. Readable a => a -> Int -> IO ShortByteString
extractShortByteString a
rbuf Int
xlen
            forall a. Readable a => a -> Int -> IO ()
ff a
rbuf (Int
20 forall a. Num a => a -> a -> a
- Int
xlen)
            forall (m :: * -> *) a. Monad m => a -> m a
return CID
x
    poke :: Ptr CryptoToken -> CryptoToken -> IO ()
poke Ptr CryptoToken
ptr (CryptoToken (Version Word32
ver) TimeMicrosecond
tim Maybe (CID, CID, CID)
mcids) = do
        WriteBuffer
wbuf <- Buffer -> Int -> IO WriteBuffer
newWriteBuffer (forall a b. Ptr a -> Ptr b
castPtr Ptr CryptoToken
ptr) Int
cryptoTokenSize
        WriteBuffer -> Word32 -> IO ()
write32 WriteBuffer
wbuf Word32
ver
        let CTime Int64
s = TimeMicrosecond -> CTime
utSeconds TimeMicrosecond
tim
        WriteBuffer -> Word64 -> IO ()
write64 WriteBuffer
wbuf forall a b. (a -> b) -> a -> b
$ forall a b. (Integral a, Num b) => a -> b
fromIntegral Int64
s
        case Maybe (CID, CID, CID)
mcids of
            Maybe (CID, CID, CID)
Nothing -> WriteBuffer -> Word8 -> IO ()
write8 WriteBuffer
wbuf Word8
0
            Just (CID
l, CID
r, CID
o) -> do
                WriteBuffer -> Word8 -> IO ()
write8 WriteBuffer
wbuf Word8
1
                WriteBuffer -> CID -> IO ()
bury WriteBuffer
wbuf CID
l
                WriteBuffer -> CID -> IO ()
bury WriteBuffer
wbuf CID
r
                WriteBuffer -> CID -> IO ()
bury WriteBuffer
wbuf CID
o
      where
        bury :: WriteBuffer -> CID -> IO ()
bury WriteBuffer
wbuf CID
x = do
            let (ShortByteString
xcid, Word8
xlen) = CID -> (ShortByteString, Word8)
unpackCID CID
x
            WriteBuffer -> Word8 -> IO ()
write8 WriteBuffer
wbuf Word8
xlen
            WriteBuffer -> ShortByteString -> IO ()
copyShortByteString WriteBuffer
wbuf ShortByteString
xcid
            forall a. Readable a => a -> Int -> IO ()
ff WriteBuffer
wbuf (Int
20 forall a. Num a => a -> a -> a
- forall a b. (Integral a, Num b) => a -> b
fromIntegral Word8
xlen)