module Network.Wai.Middleware.Debug
( debug
, debugHandle
) where
import Network.Wai (Request(..), Middleware)
import Network.Wai.Parse (parseRequestBody, lbsSink, fileName, Param, File)
import Data.ByteString.Char8 (unpack)
import qualified Data.ByteString as S
import qualified Data.ByteString.Lazy as L
import System.IO (hPutStrLn, stderr)
import Control.Monad.IO.Class (liftIO)
import qualified Data.Text.Lazy as T
import Data.Enumerator (run_, ($$), enumList)
import Data.Enumerator.List (consume)
debug :: Middleware
debug = debugHandle $ hPutStrLn stderr . T.unpack
debugHandle :: (T.Text -> IO ()) -> Middleware
debugHandle cb app req = do
body <- consume
postParams <- if any (requestMethod req ==) ["GET", "HEAD"]
then return []
else do postParams <- liftIO $ allPostParams req body
return $ collectPostParams postParams
let getParams = map emptyGetParam $ queryString req
liftIO $ cb $ T.pack $ concat
[ unpack $ requestMethod req
, " "
, unpack $ rawPathInfo req
, "\n"
, (++) "Accept: " $ maybe "" unpack $ lookup "Accept" $ requestHeaders req
, paramsToStr "GET " getParams
, paramsToStr "POST " postParams
]
liftIO $ run_ $ enumList 1 body $$ app req
where
paramsToStr prefix params = if null params then "" else "\n" ++ prefix ++ (show params)
allPostParams req body = run_ $ enumList 1 body $$ parseRequestBody lbsSink req
emptyGetParam :: (S.ByteString, Maybe S.ByteString) -> (S.ByteString, S.ByteString)
emptyGetParam (k, Just v) = (k,v)
emptyGetParam (k, Nothing) = (k,"")
collectPostParams :: ([Param], [File L.ByteString]) -> [Param]
collectPostParams (postParams, files) = postParams ++
(map (\(k,v) -> (k, S.append "FILE: " (fileName v))) files)