69 lines
1.9 KiB
Haskell
69 lines
1.9 KiB
Haskell
{-# LANGUAGE TypeSynonymInstances #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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---------------------------------------------------------
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--
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-- Module : Yesod.Helpers.Static
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-- Copyright : Michael Snoyman
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-- License : BSD3
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--
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-- Maintainer : Michael Snoyman <michael@snoyman.com>
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-- Stability : Unstable
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-- Portability : portable
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--
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-- Serve static files from a Yesod app.
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--
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-- This is most useful for standalone testing. When running on a production
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-- server (like Apache), just let the server do the static serving.
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--
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---------------------------------------------------------
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module Yesod.Helpers.Static
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( serveStatic
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, FileLookup
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, fileLookupDir
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) where
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import qualified Data.ByteString as B
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import System.Directory (doesFileExist)
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import Control.Applicative ((<$>))
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import Yesod
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type FileLookup = FilePath -> IO (Maybe B.ByteString)
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-- | A 'FileLookup' for files in a directory.
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fileLookupDir :: FilePath -> FileLookup
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fileLookupDir dir fp = do
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let fp' = dir ++ '/' : fp -- FIXME incredibly insecure...
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exists <- doesFileExist fp'
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if exists
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then Just <$> B.readFile fp'
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else return Nothing
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serveStatic :: FileLookup -> Verb -> Handler
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serveStatic fl Get = getStatic fl
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serveStatic _ _ = notFound
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getStatic :: FileLookup -> Handler
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getStatic fl = do
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fp <- urlParam "filepath" -- FIXME check for ..
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content <- liftIO $ fl fp
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case content of
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Nothing -> notFound
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Just bs -> return [(mimeType $ ext fp, return $ toContent bs)]
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mimeType :: String -> String
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mimeType "jpg" = "image/jpeg"
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mimeType "jpeg" = "image/jpeg"
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mimeType "js" = "text/javascript"
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mimeType "css" = "text/css"
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mimeType "html" = "text/html"
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mimeType "png" = "image/png"
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mimeType "gif" = "image/gif"
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mimeType "txt" = "text/plain"
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mimeType "flv" = "video/x-flv"
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mimeType "ogv" = "video/ogg"
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mimeType _ = "application/octet-stream"
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ext :: String -> String
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ext = reverse . fst . break (== '.') . reverse
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