204 lines
6.5 KiB
Haskell
204 lines
6.5 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE CPP #-}
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{-# LANGUAGE FlexibleInstances #-}
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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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-- 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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, StaticRoute (..)
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-- * Smart constructor
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, static
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-- * Template Haskell helpers
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, staticFiles
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{-
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-- * Embed files
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, getStaticHandler
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-}
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-- * Hashing
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, base64md5
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#if TEST
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, testSuite
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#endif
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) where
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import System.Directory
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import Control.Monad
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import Yesod.Handler
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import Yesod.Core
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import Data.List (intercalate)
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import Language.Haskell.TH
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import Language.Haskell.TH.Syntax
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import Data.Char
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import qualified Data.ByteString.Lazy as L
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import Data.Digest.Pure.MD5
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import qualified Data.ByteString.Base64
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import qualified Data.ByteString.Char8 as S8
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import qualified Data.Serialize
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import Network.Wai.Application.Static
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( defaultMimeTypeByExt, StaticSettings (..), staticAppPieces
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, defaultListing
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)
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#if TEST
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import Test.Framework (testGroup, Test)
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import Test.Framework.Providers.HUnit
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import Test.HUnit hiding (Test)
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#endif
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newtype Static = Static StaticSettings
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-- | Default value of 'Static' for a given file folder.
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--
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-- Does not have index files, uses default directory listings and default mime
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-- type list.
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static :: FilePath -> Static
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static fp = Static $ StaticSettings fp [] (Just defaultListing)
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(return . defaultMimeTypeByExt)
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-- | Manually construct a static route.
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-- The first argument is a sub-path to the file being served whereas the second argument is the key value pairs in the query string.
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-- For example,
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-- > StaticRoute $ StaticR ["thumb001.jpg"] [("foo", "5"), ("bar", "choc")]
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-- would generate a url such as 'http://site.com/static/thumb001.jpg?foo=5&bar=choc'
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-- The StaticRoute constructor can be used when url's cannot be statically generated at compile-time.
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-- E.g. When generating image galleries.
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data StaticRoute = StaticRoute [String] [(String, String)]
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deriving (Eq, Show, Read)
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type instance Route Static = StaticRoute
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instance RenderRoute StaticRoute where
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renderRoute (StaticRoute x y) = (x, y)
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instance Yesod master => YesodDispatch Static master where
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yesodDispatch (Static set) _ pieces _ _ =
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Just $ staticAppPieces set pieces
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{- FIXME
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-- | Dispatch static route for a subsite
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--
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-- Subsites with static routes can't (yet) define Static routes the same way "master" sites can.
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-- Instead of a subsite route:
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-- /static StaticR Static getStatic
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-- Use a normal route:
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-- /static/*Strings StaticR GET
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--
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-- Then, define getStaticR something like:
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-- getStaticR = getStaticHandler ($(mkEmbedFiles "static") typeByExt) StaticR
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-- */ end CPP comment
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getStaticHandler :: Static -> (StaticRoute -> Route sub) -> [String] -> GHandler sub y ChooseRep
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getStaticHandler static toSubR pieces = do
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toMasterR <- getRouteToMaster
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toMasterHandler (toMasterR . toSubR) toSub route handler
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where route = StaticRoute pieces []
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toSub _ = static
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staticSite = getSubSite :: Site (Route Static) (String -> Maybe (GHandler Static y ChooseRep))
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handler = fromMaybe notFound $ handleSite staticSite undefined route "GET"
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-}
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notHidden :: FilePath -> Bool
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notHidden ('.':_) = False
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notHidden "tmp" = False
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notHidden _ = True
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getFileList :: FilePath -> IO [[String]]
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getFileList = flip go id
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where
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go :: String -> ([String] -> [String]) -> IO [[String]]
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go fp front = do
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allContents <- filter notHidden `fmap` getDirectoryContents fp
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let fullPath :: String -> String
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fullPath f = fp ++ '/' : f
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files <- filterM (doesFileExist . fullPath) allContents
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let files' = map (front . return) files
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dirs <- filterM (doesDirectoryExist . fullPath) allContents
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dirs' <- mapM (\f -> go (fullPath f) (front . (:) f)) dirs
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return $ concat $ files' : dirs'
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-- | This piece of Template Haskell will find all of the files in the given directory and create Haskell identifiers for them. For example, if you have the files \"static\/style.css\" and \"static\/js\/script.js\", it will essentailly create:
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--
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-- > style_css = StaticRoute ["style.css"] []
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-- > js_script_js = StaticRoute ["js/script.js"] []
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staticFiles :: FilePath -> Q [Dec]
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staticFiles fp = do
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fs <- qRunIO $ getFileList fp
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concat `fmap` mapM go fs
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where
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replace' c
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| 'A' <= c && c <= 'Z' = c
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| 'a' <= c && c <= 'z' = c
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| '0' <= c && c <= '9' = c
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| otherwise = '_'
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go f = do
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let adjust [] = ""
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adjust str@(x:xs) | isDigit x = '_' : x : xs
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| isUpper x = toLower x : xs
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| otherwise = str
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let name = mkName $ intercalate "_" $ map (adjust . map replace') f
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f' <- lift f
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let sr = ConE $ mkName "StaticRoute"
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hash <- qRunIO $ fmap base64md5 $ L.readFile $ fp ++ '/' : intercalate "/" f
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let qs = ListE [TupE [LitE $ StringL hash, ListE []]]
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return
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[ SigD name $ ConT ''Route `AppT` ConT ''Static
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, FunD name
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[ Clause [] (NormalB $ sr `AppE` f' `AppE` qs) []
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]
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]
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#if TEST
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testSuite :: Test
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testSuite = testGroup "Yesod.Helpers.Static"
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[ testCase "get file list" caseGetFileList
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]
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caseGetFileList :: Assertion
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caseGetFileList = do
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x <- getFileList "test"
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x @?= [["foo"], ["bar", "baz"]]
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#endif
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-- | md5-hashes the given lazy bytestring and returns the hash as
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-- base64url-encoded string.
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--
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-- This function returns the first 8 characters of the hash.
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base64md5 :: L.ByteString -> String
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base64md5 = map go
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. take 8
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. S8.unpack
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. Data.ByteString.Base64.encode
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. Data.Serialize.encode
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. md5
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where
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go '+' = '-'
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go '/' = '_'
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go c = c
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