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|
-- | Implements a basic static file server for previewing options
--
{-# LANGUAGE OverloadedStrings #-}
module Hakyll.Web.Preview.Server
( staticServer
) where
import Control.Monad.Trans (liftIO)
import Control.Applicative ((<$>))
import Codec.Binary.UTF8.String
import Network.HTTP.Base (urlDecode)
import System.FilePath ((</>))
import System.Directory (doesFileExist)
import qualified Data.ByteString as SB
import Snap.Util.FileServe (serveFile)
import Snap.Types (Snap, rqURI, getRequest, writeBS)
import Snap.Http.Server ( httpServe, setAccessLog, setErrorLog, addListen
, ConfigListen (..), emptyConfig
)
import Hakyll.Core.Util.String (replaceAll)
-- | The first file in the list that actually exists is returned
--
findFile :: [FilePath] -> IO (Maybe FilePath)
findFile [] = return Nothing
findFile (x : xs) = do
exists <- doesFileExist x
if exists then return (Just x) else findFile xs
-- | Serve a given directory
--
static :: FilePath -- ^ Directory to serve
-> (FilePath -> IO ()) -- ^ Pre-serve hook
-> Snap ()
static directory preServe = do
-- Obtain the path
uri <- rqURI <$> getRequest
let filePath = replaceAll "\\?.*$" (const "") -- Remove trailing ?
$ replaceAll "#[^#]*$" (const "") -- Remove #section
$ replaceAll "^/" (const "") -- Remove leading /
$ urlDecode $ decode $ SB.unpack uri
-- Try to find the requested file
r <- liftIO $ findFile $ map (directory </>) $
[ filePath
, filePath </> "index.htm"
, filePath </> "index.html"
]
case r of
-- Not found, error
Nothing -> writeBS "Not found"
-- Found, serve
Just f -> do
liftIO $ preServe f
serveFile f
-- | Main method, runs a static server in the given directory
--
staticServer :: FilePath -- ^ Directory to serve
-> (FilePath -> IO ()) -- ^ Pre-serve hook
-> Int -- ^ Port to listen on
-> IO () -- ^ Blocks forever
staticServer directory preServe port =
httpServe config $ static directory preServe
where
-- Snap server config
config = addListen (ListenHttp "0.0.0.0" port)
$ setAccessLog Nothing
$ setErrorLog Nothing
$ emptyConfig
|
