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{-# LANGUAGE OverloadedStrings, DeriveGeneric #-}
module SessionID (
SessionID,
mkSessionID,
sessionLogFile,
withSessionID,
sessionIDUrl,
) where
import Serialization
import System.FilePath
import Data.Text
import System.IO
import Network.Wai.Handler.Warp (Port)
import Network.WebSockets hiding (Message)
import qualified Data.Aeson
import Data.Maybe
-- | A SessionID is the base name of the log file to use,
-- and may not contain any path information.
newtype SessionID = SessionID FilePath
deriving (Show, Eq, Ord, Generic)
instance ToJSON SessionID
instance FromJSON SessionID
instance WebSocketsData SessionID where
-- fromDataMessage = fromLazyByteString . fromDataMessage
fromLazyByteString = fromMaybe (error "bad SessionID") . Data.Aeson.decode
toLazyByteString = Data.Aeson.encode
-- | Smart constructor that enforces legal SessionID contents.
--
-- The passed Text can either be the bare SessionID, or it can be an URL
-- which ends with the SessionID.
mkSessionID :: Text -> Maybe SessionID
mkSessionID t =
let s = unpack t
in if "http" `isPrefixOf` t
then Just $ SessionID $ takeFileName s
else if takeFileName s == s
then Just $ SessionID s
else Nothing
sessionLogFile :: FilePath -> SessionID -> FilePath
sessionLogFile dir (SessionID f) = dir </> "debug-me." ++ f ++ ".log"
-- | Allocate a new SessionID and return an open Handle to its log file.
withSessionID :: FilePath -> ((Handle, SessionID) -> IO a) -> IO a
withSessionID dir a = do
-- TODO find an unused log file and open it
let sid = SessionID "1"
withFile "debug-me-server.log" WriteMode $ \h -> a (h, sid)
type UrlString = String
sessionIDUrl :: SessionID -> String -> Port -> UrlString
sessionIDUrl (SessionID f) host port = "http://" ++ host ++ ":" ++ show port ++ "/" ++ f
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