76 lines
2.3 KiB
Haskell
76 lines
2.3 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeFamilies #-}
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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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-- In fact, in an ideal setup you'll serve your static files from a separate
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-- domain name to save time on transmitting cookies. In that case, you may wish
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-- to use 'urlRenderOverride' to redirect requests to this subsite to a
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-- separate domain name.
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module Yesod.Helpers.Static
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( -- * Subsite
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Static (..)
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, StaticRoutes (..)
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, siteStatic
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-- * Lookup files in filesystem
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, fileLookupDir
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) where
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import System.Directory (doesFileExist)
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import Control.Monad
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import Yesod
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import Data.List (intercalate)
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-- | A function for looking up file contents. For serving from the file system,
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-- see 'fileLookupDir'.
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data Static = Static (FilePath -> IO (Maybe (Either FilePath Content)))
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$(mkYesodSub "Static" [] [$parseRoutes|
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/* StaticRoute GET
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|])
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-- | Lookup files in a specific directory.
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--
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-- If you are just using this in combination with the static subsite (you
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-- probably are), the handler itself checks that no unsafe paths are being
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-- requested. In particular, no path segments may begin with a single period,
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-- so hidden files and parent directories are safe.
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fileLookupDir :: FilePath -> Static
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fileLookupDir dir = Static $ \fp -> do
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let fp' = dir ++ '/' : fp
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exists <- doesFileExist fp'
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if exists
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then return $ Just $ Left fp'
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else return Nothing
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getStaticRoute :: [String]
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-> GHandler Static master [(ContentType, Content)]
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getStaticRoute fp' = do
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Static fl <- getYesodSub
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when (any isUnsafe fp') notFound
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let fp = intercalate "/" fp'
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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 (Left fp'') -> sendFile (typeByExt $ ext fp'') fp''
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Just (Right bs) -> return [(typeByExt $ ext fp, cs bs)]
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where
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isUnsafe [] = True
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isUnsafe ('.':_) = True
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isUnsafe _ = False
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