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HttpRedirect.hs
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HttpRedirect.hs
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{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_GHC -fwarn-unused-binds -fwarn-unused-imports #-}
import Network.Wai
import Network.Wai.Handler.Warp
import Network.HTTP.Types
import Data.List.Extra
import Data.Tuple.Extra
import System.FilePath
import System.Directory
import qualified Data.ByteString.Char8 as BS
import Control.Monad.Extra
import Control.Monad.IO.Class
import qualified Network.HTTP.Conduit as C
import Network.Connection
import Data.Conduit.Binary
import qualified Data.Conduit as C
import Control.Monad.Trans.Resource
import Network
main :: IO ()
main = withSocketsDo $ do
let port = 3000
putStrLn $ "Listening on port " ++ show port
run port $ \req f -> f =<< app req
app :: Request -> IO Response
app req = do
let want = tail $ BS.unpack $ rawPathInfo req `BS.append` rawQueryString req
let url = uncurry (++) $ first (++ ":/") $ break ('/' ==) want
let file = "mirror" </> replace "?" "_" (replace "/" "_" want)
createDirectoryIfMissing True "mirror"
-- download the file
unlessM (doesFileExist file) $ do
manager <- C.newManager $ C.mkManagerSettings (TLSSettingsSimple True False False) Nothing
request <- C.parseUrlThrow url
runResourceT $ do
response <- C.http request manager
C.responseBody response C.$$+- sinkFile file
liftIO $ print $ C.responseStatus response
-- pass it onwards
return $ responseFile status200 [] file Nothing