{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}

module Network.Wai.Handler.Warp.HTTP2 (
    http2,
    http2server,
) where

import qualified Data.ByteString as BS
import Data.IORef (readIORef)
import qualified Data.IORef as I
import qualified Network.HTTP2.Frame as H2
import qualified Network.HTTP2.Server as H2
import Network.Socket (SockAddr)
import Network.Socket.BufferPool
import Network.Wai
import Network.Wai.Internal (ResponseReceived (..))
import qualified System.TimeManager as T
import qualified UnliftIO

import Network.Wai.Handler.Warp.HTTP2.File
import Network.Wai.Handler.Warp.HTTP2.PushPromise
import Network.Wai.Handler.Warp.HTTP2.Request
import Network.Wai.Handler.Warp.HTTP2.Response
import Network.Wai.Handler.Warp.Imports
import qualified Network.Wai.Handler.Warp.Settings as S
import Network.Wai.Handler.Warp.Types

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

http2
    :: S.Settings
    -> InternalInfo
    -> Connection
    -> Transport
    -> Application
    -> SockAddr
    -> T.Handle
    -> ByteString
    -> IO ()
http2 :: Settings
-> InternalInfo
-> Connection
-> Transport
-> Application
-> SockAddr
-> Handle
-> ByteString
-> IO ()
http2 Settings
settings InternalInfo
ii Connection
conn Transport
transport Application
app SockAddr
peersa Handle
th ByteString
bs = do
    RecvN
rawRecvN <- ByteString -> Recv -> IO RecvN
makeRecvN ByteString
bs (Recv -> IO RecvN) -> Recv -> IO RecvN
forall a b. (a -> b) -> a -> b
$ Connection -> Recv
connRecv Connection
conn
    WriteBuffer
writeBuffer <- IORef WriteBuffer -> IO WriteBuffer
forall a. IORef a -> IO a
readIORef (IORef WriteBuffer -> IO WriteBuffer)
-> IORef WriteBuffer -> IO WriteBuffer
forall a b. (a -> b) -> a -> b
$ Connection -> IORef WriteBuffer
connWriteBuffer Connection
conn
    -- This thread becomes the sender in http2 library.
    -- In the case of event source, one request comes and one
    -- worker gets busy. But it is likely that the receiver does
    -- not receive any data at all while the sender is sending
    -- output data from the worker. It's not good enough to tickle
    -- the time handler in the receiver only. So, we should tickle
    -- the time handler in both the receiver and the sender.
    let recvN :: RecvN
recvN = Handle -> Int -> RecvN -> RecvN
wrappedRecvN Handle
th (Settings -> Int
S.settingsSlowlorisSize Settings
settings) RecvN
rawRecvN
        sendBS :: ByteString -> IO ()
sendBS ByteString
x = Connection -> ByteString -> IO ()
connSendAll Connection
conn ByteString
x IO () -> IO () -> IO ()
forall a b. IO a -> IO b -> IO b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Handle -> IO ()
T.tickle Handle
th
        conf :: Config
conf =
            H2.Config
                { confWriteBuffer :: Buffer
confWriteBuffer = WriteBuffer -> Buffer
bufBuffer WriteBuffer
writeBuffer
                , confBufferSize :: Int
confBufferSize = WriteBuffer -> Int
bufSize WriteBuffer
writeBuffer
                , confSendAll :: ByteString -> IO ()
confSendAll = ByteString -> IO ()
sendBS
                , confReadN :: RecvN
confReadN = RecvN
recvN
                , confPositionReadMaker :: PositionReadMaker
confPositionReadMaker = InternalInfo -> PositionReadMaker
pReadMaker InternalInfo
ii
                , confTimeoutManager :: Manager
confTimeoutManager = InternalInfo -> Manager
timeoutManager InternalInfo
ii
#if MIN_VERSION_http2(4,2,0)
                , confMySockAddr :: SockAddr
confMySockAddr = Connection -> SockAddr
connMySockAddr Connection
conn
                , confPeerSockAddr :: SockAddr
confPeerSockAddr = SockAddr
peersa
#endif
                }
    IO ()
checkTLS
    Connection -> Bool -> IO ()
setConnHTTP2 Connection
conn Bool
True
    ServerConfig -> Config -> Server -> IO ()
H2.run ServerConfig
H2.defaultServerConfig Config
conf (Server -> IO ()) -> Server -> IO ()
forall a b. (a -> b) -> a -> b
$
        Settings
-> InternalInfo -> Transport -> SockAddr -> Application -> Server
http2server Settings
settings InternalInfo
ii Transport
transport SockAddr
peersa Application
app
  where
    checkTLS :: IO ()
checkTLS = case Transport
transport of
        Transport
TCP -> () -> IO ()
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return () -- direct
        Transport
tls -> Bool -> IO () -> IO ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless (Transport -> Bool
tls12orLater Transport
tls) (IO () -> IO ()) -> IO () -> IO ()
forall a b. (a -> b) -> a -> b
$ Connection -> ErrorCodeId -> ByteString -> IO ()
goaway Connection
conn ErrorCodeId
H2.InadequateSecurity ByteString
"Weak TLS"
    tls12orLater :: Transport -> Bool
tls12orLater Transport
tls = Transport -> Int
tlsMajorVersion Transport
tls Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
3 Bool -> Bool -> Bool
&& Transport -> Int
tlsMinorVersion Transport
tls Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
>= Int
3

-- | Converting WAI application to the server type of http2 library.
--
-- Since 3.3.11
http2server
    :: S.Settings
    -> InternalInfo
    -> Transport
    -> SockAddr
    -> Application
    -> H2.Server
http2server :: Settings
-> InternalInfo -> Transport -> SockAddr -> Application -> Server
http2server Settings
settings InternalInfo
ii Transport
transport SockAddr
addr Application
app Request
h2req0 Aux
aux0 Response -> [PushPromise] -> IO ()
response = do
    Request
req <- Request -> Aux -> IO Request
toWAIRequest Request
h2req0 Aux
aux0
    IORef (Maybe (Response, [PushPromise], Status))
ref <- Maybe (Response, [PushPromise], Status)
-> IO (IORef (Maybe (Response, [PushPromise], Status)))
forall a. a -> IO (IORef a)
I.newIORef Maybe (Response, [PushPromise], Status)
forall a. Maybe a
Nothing
    Either SomeException ResponseReceived
eResponseReceived <- IO ResponseReceived -> IO (Either SomeException ResponseReceived)
forall (m :: * -> *) a.
MonadUnliftIO m =>
m a -> m (Either SomeException a)
UnliftIO.tryAny (IO ResponseReceived -> IO (Either SomeException ResponseReceived))
-> IO ResponseReceived
-> IO (Either SomeException ResponseReceived)
forall a b. (a -> b) -> a -> b
$ Application
app Request
req ((Response -> IO ResponseReceived) -> IO ResponseReceived)
-> (Response -> IO ResponseReceived) -> IO ResponseReceived
forall a b. (a -> b) -> a -> b
$ \Response
rsp -> do
        (Response
h2rsp, Status
st, Bool
hasBody) <- Settings
-> InternalInfo
-> Request
-> Response
-> IO (Response, Status, Bool)
fromResponse Settings
settings InternalInfo
ii Request
req Response
rsp
        [PushPromise]
pps <- if Bool
hasBody then InternalInfo -> Request -> IO [PushPromise]
fromPushPromises InternalInfo
ii Request
req else [PushPromise] -> IO [PushPromise]
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return []
        IORef (Maybe (Response, [PushPromise], Status))
-> Maybe (Response, [PushPromise], Status) -> IO ()
forall a. IORef a -> a -> IO ()
I.writeIORef IORef (Maybe (Response, [PushPromise], Status))
ref (Maybe (Response, [PushPromise], Status) -> IO ())
-> Maybe (Response, [PushPromise], Status) -> IO ()
forall a b. (a -> b) -> a -> b
$ (Response, [PushPromise], Status)
-> Maybe (Response, [PushPromise], Status)
forall a. a -> Maybe a
Just (Response
h2rsp, [PushPromise]
pps, Status
st)
        ()
_ <- Response -> [PushPromise] -> IO ()
response Response
h2rsp [PushPromise]
pps
        ResponseReceived -> IO ResponseReceived
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return ResponseReceived
ResponseReceived
    case Either SomeException ResponseReceived
eResponseReceived of
        Right ResponseReceived
ResponseReceived -> do
            Just (Response
h2rsp, [PushPromise]
pps, Status
st) <- IORef (Maybe (Response, [PushPromise], Status))
-> IO (Maybe (Response, [PushPromise], Status))
forall a. IORef a -> IO a
I.readIORef IORef (Maybe (Response, [PushPromise], Status))
ref
            let msiz :: Maybe Integer
msiz = Int -> Integer
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Int -> Integer) -> Maybe Int -> Maybe Integer
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Response -> Maybe Int
H2.responseBodySize Response
h2rsp
            Request -> Status -> Maybe Integer -> IO ()
logResponse Request
req Status
st Maybe Integer
msiz
            (PushPromise -> IO ()) -> [PushPromise] -> IO ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (Request -> PushPromise -> IO ()
logPushPromise Request
req) [PushPromise]
pps
        Left SomeException
e -> do
            Settings -> Maybe Request -> SomeException -> IO ()
S.settingsOnException Settings
settings (Request -> Maybe Request
forall a. a -> Maybe a
Just Request
req) SomeException
e
            let ersp :: Response
ersp = Settings -> SomeException -> Response
S.settingsOnExceptionResponse Settings
settings SomeException
e
                st :: Status
st = Response -> Status
responseStatus Response
ersp
            (Response
h2rsp', Status
_, Bool
_) <- Settings
-> InternalInfo
-> Request
-> Response
-> IO (Response, Status, Bool)
fromResponse Settings
settings InternalInfo
ii Request
req Response
ersp
            let msiz :: Maybe Integer
msiz = Int -> Integer
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Int -> Integer) -> Maybe Int -> Maybe Integer
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Response -> Maybe Int
H2.responseBodySize Response
h2rsp'
            ()
_ <- Response -> [PushPromise] -> IO ()
response Response
h2rsp' []
            Request -> Status -> Maybe Integer -> IO ()
logResponse Request
req Status
st Maybe Integer
msiz
    () -> IO ()
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
  where
    toWAIRequest :: Request -> Aux -> IO Request
toWAIRequest Request
h2req Aux
aux = InternalInfo -> Settings -> SockAddr -> ToReq
toRequest InternalInfo
ii Settings
settings SockAddr
addr TokenHeaderTable
hdr Maybe Int
bdylen Recv
bdy Handle
th Transport
transport
      where
        !hdr :: TokenHeaderTable
hdr = Request -> TokenHeaderTable
H2.requestHeaders Request
h2req
        !bdy :: Recv
bdy = Request -> Recv
H2.getRequestBodyChunk Request
h2req
        !bdylen :: Maybe Int
bdylen = Request -> Maybe Int
H2.requestBodySize Request
h2req
        !th :: Handle
th = Aux -> Handle
H2.auxTimeHandle Aux
aux

    logResponse :: Request -> Status -> Maybe Integer -> IO ()
logResponse = Settings -> Request -> Status -> Maybe Integer -> IO ()
S.settingsLogger Settings
settings

    logPushPromise :: Request -> PushPromise -> IO ()
logPushPromise Request
req PushPromise
pp = Request -> ByteString -> Integer -> IO ()
logger Request
req ByteString
path Integer
siz
      where
        !logger :: Request -> ByteString -> Integer -> IO ()
logger = Settings -> Request -> ByteString -> Integer -> IO ()
S.settingsServerPushLogger Settings
settings
        !path :: ByteString
path = PushPromise -> ByteString
H2.promiseRequestPath PushPromise
pp
        !siz :: Integer
siz = case Response -> Maybe Int
H2.responseBodySize (Response -> Maybe Int) -> Response -> Maybe Int
forall a b. (a -> b) -> a -> b
$ PushPromise -> Response
H2.promiseResponse PushPromise
pp of
            Maybe Int
Nothing -> Integer
0
            Just Int
s -> Int -> Integer
forall a b. (Integral a, Num b) => a -> b
fromIntegral Int
s

wrappedRecvN
    :: T.Handle -> Int -> (BufSize -> IO ByteString) -> (BufSize -> IO ByteString)
wrappedRecvN :: Handle -> Int -> RecvN -> RecvN
wrappedRecvN Handle
th Int
slowlorisSize RecvN
readN Int
bufsize = do
    ByteString
bs <- (SomeException -> Recv) -> Recv -> Recv
forall (m :: * -> *) a.
MonadUnliftIO m =>
(SomeException -> m a) -> m a -> m a
UnliftIO.handleAny SomeException -> Recv
handler (Recv -> Recv) -> Recv -> Recv
forall a b. (a -> b) -> a -> b
$ RecvN
readN Int
bufsize
    -- TODO: think about the slowloris protection in HTTP2: current code
    -- might open a slow-loris attack vector. Rather than timing we should
    -- consider limiting the per-client connections assuming that in HTTP2
    -- we should allow only few connections per host (real-world
    -- deployments with large NATs may be trickier).
    Bool -> IO () -> IO ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when
        (ByteString -> Int
BS.length ByteString
bs Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
0 Bool -> Bool -> Bool
&& ByteString -> Int
BS.length ByteString
bs Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
>= Int
slowlorisSize Bool -> Bool -> Bool
|| Int
bufsize Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
slowlorisSize) (IO () -> IO ()) -> IO () -> IO ()
forall a b. (a -> b) -> a -> b
$
        Handle -> IO ()
T.tickle Handle
th
    ByteString -> Recv
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
bs
  where
    handler :: UnliftIO.SomeException -> IO ByteString
    handler :: SomeException -> Recv
handler SomeException
_ = ByteString -> Recv
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
""

-- connClose must not be called here since Run:fork calls it
goaway :: Connection -> H2.ErrorCodeId -> ByteString -> IO ()
goaway :: Connection -> ErrorCodeId -> ByteString -> IO ()
goaway Connection{IO ()
Recv
IORef Bool
IORef WriteBuffer
SockAddr
[ByteString] -> IO ()
RecvBuf
ByteString -> IO ()
SendFile
connRecv :: Connection -> Recv
connWriteBuffer :: Connection -> IORef WriteBuffer
connSendAll :: Connection -> ByteString -> IO ()
connMySockAddr :: Connection -> SockAddr
connSendMany :: [ByteString] -> IO ()
connSendAll :: ByteString -> IO ()
connSendFile :: SendFile
connClose :: IO ()
connRecv :: Recv
connRecvBuf :: RecvBuf
connWriteBuffer :: IORef WriteBuffer
connHTTP2 :: IORef Bool
connMySockAddr :: SockAddr
connSendMany :: Connection -> [ByteString] -> IO ()
connSendFile :: Connection -> SendFile
connClose :: Connection -> IO ()
connRecvBuf :: Connection -> RecvBuf
connHTTP2 :: Connection -> IORef Bool
..} ErrorCodeId
etype ByteString
debugmsg = ByteString -> IO ()
connSendAll ByteString
bytestream
  where
    einfo :: EncodeInfo
einfo = (FrameFlags -> FrameFlags) -> Int -> EncodeInfo
H2.encodeInfo FrameFlags -> FrameFlags
forall a. a -> a
id Int
0
    frame :: FramePayload
frame = Int -> ErrorCodeId -> ByteString -> FramePayload
H2.GoAwayFrame Int
0 ErrorCodeId
etype ByteString
debugmsg
    bytestream :: ByteString
bytestream = EncodeInfo -> FramePayload -> ByteString
H2.encodeFrame EncodeInfo
einfo FramePayload
frame