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fix etag parameter handling
commit88e069cc0039a006f30cdc485e99b02b287d3055 authorGreg Weber <greg@gregweber.info> dateWed 29 Jun 2011, 09:53 (15 years ago) parent4414f7b
2 files changed+119−72
Network/Wai/Application/Static.hs+60−31 tests/runtests.hs+59−41
Network/Wai/Application/Static.hs+60−31
@@ -85,15 +85,13 @@ import Data.Function (on)
8585import Data.Ord (comparing)
8686import qualified Data.ByteString.Base64 as B64
8787import Data.Either (rights)
88+import Data.Maybe (isJust, fromJust)
8889
89−#ifdef PRINT
90+{-
9091import Debug.Trace
9192debug :: (Show a) => a -> a
9293debug a = trace ("DEBUG: " ++ show a) a
93−#else
94−debug :: a -> a
95−debug = id
96−#endif
94+-}
9795
9896-- | A list of all possible extensions, starting from the largest.
9997takeExtensions :: FilePath -> [String]
@@ -189,8 +187,9 @@ mimeTypeByExt mm def =
189187defaultMimeTypeByExt :: FilePath -> MimeType
190188defaultMimeTypeByExt = mimeTypeByExt defaultMimeTypes defaultMimeType
191189
192−data CheckPieces
193− = Redirect Pieces
190+data CheckPieces =
191+ -- | Just the etag hash or Nothing for no etag hash
192+ Redirect Pieces (Maybe ByteString)
194193 | Forbidden
195194 | NotFound
196195 | FileResponse File H.ResponseHeaders
@@ -251,7 +250,7 @@ checkPieces :: (Pieces -> IO FileLookup) -- ^ file lookup function
251250checkPieces fileLookup indices pieces req maxAge
252251 | any (unsafe . piecePretty) pieces = return Forbidden
253252 | any (T.null . piecePretty) $ safeInit pieces =
254− return $ Redirect $ filterButLast (not . T.null . piecePretty) pieces
253+ return $ Redirect (filterButLast (not . T.null . piecePretty) pieces) Nothing
255254 | otherwise = do
256255 let (isFile, isFolder) =
257256 case () of
@@ -264,16 +263,17 @@ checkPieces fileLookup indices pieces req maxAge
264263 case (fl, isFile) of
265264 (Nothing, _) -> return NotFound
266265 (Just (Right file), True) -> handleCache file
267− (Just Right{}, False) -> return $ Redirect $ init pieces
266+ (Just Right{}, False) -> return $ Redirect (init pieces) Nothing
268267 (Just (Left folder@(Folder _ contents)), _) -> do
269268 case checkIndices $ map fileName $ rights contents of
270− Just index -> return $ Redirect $ setLast pieces $ Piece (T.unpack index) index
269+ Just index -> return $ Redirect (setLast pieces $ Piece (T.unpack index) index) Nothing
271270 Nothing ->
272271 if isFolder
273272 then return $ DirectoryResponse folder
274− else return $ Redirect $ pieces ++ [Piece "" ""]
273+ else return $ Redirect (pieces ++ [Piece "" ""]) Nothing
275274 where
276275 headers = W.requestHeaders req
276+ queryString = W.queryString req
277277
278278 -- HTTP caching has a cache control header that you can set an expire time for a resource.
279279 -- Max-Age is easiest because it is a simple number
@@ -285,29 +285,42 @@ checkPieces fileLookup indices pieces req maxAge
285285 --
286286 -- We should set a cache control and one of ETag or last-modifed whenever possible
287287 --
288− -- in a Yesod web application we append an etag parameter to static assets.
289− -- This should set both a max-age and ETag header
288+ -- In a Yesod web application we can append an etag parameter to static assets.
289+ -- This signals that both a max-age and ETag header should be set
290290 -- if there is no etag parameter
291291 -- * don't set the max-age
292292 -- * set ETag or last-modified
293293 -- * ETag must be calculated ahead of time.
294294 -- * last-modified is just the file mtime.
295− handleCache file =
296− case (lookup "if-none-match" headers, fileGetHash file) of
297− -- etag
298− (Just lastHash, Just getHash) -> do
299− hash <- getHash
300− if hash == lastHash
301− then return NotModified
302− else return $ FileResponse file $ ("ETag", hash):cacheControl
303− _ ->
304− case (lookup "if-modified-since" headers >>= parseDate, fileGetModified file) of
305− -- last-modified
306− (Just lastSent, Just modified) -> do
307− if lastSent >= modified
308− then return NotModified
309− else respond file
310− _ -> respond file
295+ handleCache file = do
296+ let mGetHash = fileGetHash file
297+ let etagParam = lookup "etag" queryString
298+
299+ case (etagParam, mGetHash) of
300+ (Just mEtag, Just getHash) -> do
301+ hash <- getHash
302+ if isJust mEtag && hash == fromJust mEtag
303+ then return $ FileResponse file $ ("ETag", hash):cacheControl
304+ else return $ Redirect pieces (Just hash)
305+ -- a file used to have an etag parameter, but no longer does
306+ (Just _, Nothing) -> return $ Redirect pieces Nothing
307+
308+ _ ->
309+ case (lookup "if-none-match" headers, mGetHash) of
310+ -- etag
311+ (Just lastHash, Just getHash) -> do
312+ hash <- getHash
313+ if hash == lastHash
314+ then return NotModified
315+ else return $ FileResponse file $ [("ETag", hash)]
316+ _ ->
317+ case (lookup "if-modified-since" headers >>= parseDate, fileGetModified file) of
318+ -- last-modified
319+ (Just lastSent, Just modified) -> do
320+ if lastSent >= modified
321+ then return NotModified
322+ else respond file
323+ _ -> respond file
311324
312325 respond file = do
313326 mhash <- maybe (return Nothing) (fmap Just) $ fileGetHash file
@@ -519,6 +532,18 @@ status304, statusNotModified :: H.Status
519532status304 = H.Status 304 "Not Modified"
520533statusNotModified = status304
521534
535+-- alist helper functions
536+replace :: Eq a => a -> b -> [(a, b)] -> [(a, b)]
537+replace k v [] = [(k,v)]
538+replace k v (x:xs) | fst x == k = (k,v):xs
539+ | otherwise = x:replace k v xs
540+
541+remove :: Eq a => a -> [(a, b)] -> [(a, b)]
542+remove _ [] = []
543+remove k (x:xs) | fst x == k = xs
544+ | otherwise = x:remove k xs
545+
546+
522547staticAppPieces :: StaticSettings -> Pieces -> W.Application
523548staticAppPieces _ _ req
524549 | W.requestMethod req /= "GET" = return $ W.responseLBS
@@ -559,12 +584,16 @@ staticAppPieces ss pieces req = liftIO $ do
559584 [ ("Content-Type", mt)
560585 -- TODO: set Content-Length
561586 ] lbs
562− Redirect pieces' -> do
587+
588+ Redirect pieces' mHash -> do
563589 let loc = (ssMkRedirect ss) pieces' $ toByteString (H.encodePathSegments $ map piecePretty pieces')
590+ let qString = case mHash of
591+ Just hash -> replace "etag" (Just hash) (W.queryString req)
592+ Nothing -> remove "etag" (W.queryString req)
564593
565594 return $ W.responseLBS H.status301
566595 [ ("Content-Type", "text/plain")
567− , ("Location", loc)
596+ , ("Location", S8.append loc $ H.renderQuery True qString)
568597 ] "Redirect"
569598 Forbidden -> return $ W.responseLBS H.status403
570599 [ ("Content-Type", "text/plain")
tests/runtests.hs+59−41
@@ -1,4 +1,4 @@
1−{-# LANGUAGE OverloadedStrings #-}
1+{-# LANGUAGE OverloadedStrings, NoMonomorphismRestriction #-}
22import Network.Wai.Application.Static
33
44import Test.Hspec.Monadic
@@ -41,11 +41,14 @@ setRawPathInfo r rawPinfo =
4141 in r { rawPathInfo = rawPinfo, pathInfo = pInfo }
4242
4343
44+-- debug :: String -> m0 ()
45+debug = liftIO . hPutStrLn stderr
46+
4447main :: IO a
4548main = hspecX $ do
4649 let must = liftIO . assert
47− let info = liftIO . hPutStrLn stderr
4850
51+{-
4952 describe "Pieces: pathFromPieces" $ do
5053 it "converts to a file path" $
5154 (pathFromPieces "prefix" [Piece "a" "a", Piece "bc" "bc"]) @?= "prefix/a/bc"
@@ -53,21 +56,13 @@ main = hspecX $ do
5356 prop "each piece is in file path" $ \piecesS ->
5457 let pieces = map (\p -> Piece p "") piecesS
5558 in all (\p -> ("/" ++ p) `isInfixOf` (pathFromPieces "root" $ pieces)) piecesS
59+-}
5660
5761
58− let statApp = flip runSession $ staticApp defaultFileServerSettings {ssFolder = fileSystemLookup "tests"}
59− describe "staticApp" $ do
60− it "403 for unsafe paths" $ statApp $
61− flip mapM_ ["..", "."] $ \path ->
62− assertStatus 403 =<<
63− request (setRawPathInfo defRequest path)
64−
65− it "200 for hidden paths" $ statApp $
66− flip mapM_ [".hidden/folder.png", ".hidden/haskell.png"] $ \path ->
67− assertStatus 200 =<<
68− request (setRawPathInfo defRequest path)
62+ let fileServerApp = flip runSession $ staticApp defaultFileServerSettings {ssFolder = fileSystemLookup "tests"}
6963
70− it "directory listing for index" $ statApp $ do
64+ describe "fileServerApp" $ do
65+ it "directory listing for index" $ fileServerApp $ do
7166 resp <- request (setRawPathInfo defRequest "a/")
7267 assertStatus 200 resp
7368 let body = simpleBody resp
@@ -76,11 +71,28 @@ main = hspecX $ do
7671 must $ body `contains` "<img src=\"../.hidden/folder.png\" alt=\"Folder\" />"
7772 must $ body `contains` "<a href=\"b\">b</a>"
7873
79− it "404 for non-existant files" $ statApp $
74+ let webApp = flip runSession $ staticApp defaultWebAppSettings {ssFolder = fileSystemLookup "tests"}
75+
76+ {-
77+ describe "webApp" $ do
78+ it "403 for unsafe paths" $ webApp $
79+ flip mapM_ ["..", "."] $ \path ->
80+ assertStatus 403 =<<
81+ request (setRawPathInfo defRequest path)
82+
83+ it "200 for hidden paths" $ webApp $
84+ flip mapM_ [".hidden/folder.png", ".hidden/haskell.png"] $ \path ->
85+ assertStatus 200 =<<
86+ request (setRawPathInfo defRequest path)
87+
88+-}
89+
90+{-
91+ it "404 for non-existant files" $ webApp $
8092 assertStatus 404 =<<
8193 request (setRawPathInfo defRequest "doesNotExist")
8294
83− it "301 redirect when multiple slashes" $ statApp $ do
95+ it "301 redirect when multiple slashes" $ webApp $ do
8496 req <- request (setRawPathInfo defRequest "a//b/c")
8597 assertStatus 301 req
8698 assertHeader "Location" "../../a/b/c" req
@@ -93,52 +105,57 @@ main = hspecX $ do
93105 req <- request (setRawPathInfo defRequest path)
94106 assertStatus 301 req
95107 assertHeader "Location" "http://www.example.com/a/b/c" req
108+-}
96109
97− describe "when requesting a static asset" $ do
98− let runtests = setRawPathInfo defRequest "runtests.hs"
99− it "200 when no query parameters" $ statApp $ do
100− req <- request runtests
110+ describe "webApp when requesting a static asset" $ do
111+ let statFile = setRawPathInfo defRequest "a/b"
112+ {-
113+ it "200 when no query parameters" $ webApp $ do
114+ req <- request statFile
101115 assertStatus 200 req
102116 assertNoHeader "Cache-Control" req
103117
104− it "200 when invalid if-modified-since header" $ statApp $ do
105− req <- request runtests {
106− requestHeaders = [("If-Modified-Since", "")]
107− }
108− assertStatus 200 req
118+ it "200 when no cache headers and bad cache query string" $ webApp $ do
119+ req <- request statFile { queryString = [("etag", Just "cached")] }
120+ assertStatus 301 req
121+ assertHeader "Location" "../a/b?etag=1B2M2Y8AsgTpgAmY7PhCfg%3D%3D" req
109122 assertNoHeader "Cache-Control" req
110123
111− it "200 when no cache headers and no cache query string" $ statApp $ do
112− req <- request runtests { rawQueryString ="?foo" }
113− assertStatus 200 req
124+ it "200 when no cache headers and empty cache query string" $ webApp $ do
125+ req <- request statFile { queryString = [("etag", Nothing)] }
126+ assertStatus 301 req
127+ assertHeader "Location" "../a/b?etag=1B2M2Y8AsgTpgAmY7PhCfg%3D%3D" req
114128 assertNoHeader "Cache-Control" req
115129
116− it "200 when no cache headers and bad cache query string" $ statApp $ do
117− req <- request runtests { rawQueryString ="?etag=cached" }
130+ it "Cache-Control set when etag parameter is correct" $ webApp $ do
131+ req <- request statFile { queryString = [("etag", Just "1B2M2Y8AsgTpgAmY7PhCfg==")] }
118132 assertStatus 200 req
119− assertNoHeader "Cache-Control" req
133+ assertHeader "Cache-Control" "max-age=31536000" req
134+ -}
120135
121− it "200 when no cache headers and bad cache query string" $ statApp $ do
122− req <- request runtests { rawQueryString ="?etag=" }
136+ it "200 when invalid if-modified-since header" $ webApp $ do
137+ req <- request statFile {
138+ requestHeaders = [("If-Modified-Since", "123")]
139+ }
123140 assertStatus 200 req
124− assertHeader "Cache-Control" "max-age=31536000" req
141+ assertNoHeader "Cache-Control" req
125142
126− it "200 when empty If-Unmodified-Since" $ statApp $ do
127− req <- request runtests { rawQueryString ="?cached",
143+ it "200 when empty If-Unmodified-Since" $ webApp $ do
144+ req <- request statFile {
128145 requestHeaders = [("If-Unmodified-Since", "")]
129146 }
130− info "WTF??***"
131147 assertStatus 200 req
132− assertHeader "Cache-Control" "max-age=31536000" req
148+ assertNoHeader "Cache-Control" req
133149
134− it "304 when cache header and query parameter sent" $ statApp $ do
135− req <- request runtests { rawQueryString ="?cached",
150+ it "304 when if-modified-since matches" $ webApp $ do
151+ req <- request statFile {
136152 requestHeaders = [("If-Modified-Since", "")]
137153 }
138154 assertStatus 304 req
139155 assertNoHeader "Cache-Control" req
156+{-
140157
141− let pubApp = flip runSession $ staticApp defaultWebAppSettings {ssFolder = fileSystemLookup "tests"}
158+ let pubApp = flip runSession $ staticApp defaultFileServerSettings {ssFolder = fileSystemLookup "tests"}
142159 describe "staticApp when requesting a public asset - etags" $ do
143160 it "200 when no etag parameters" $ pubApp $ do
144161 req <- request (setRawPathInfo defRequest "runtests.hs")
@@ -149,3 +166,4 @@ main = hspecX $ do
149166 req <- request (setRawPathInfo defRequest "runtests.hs") { requestHeaders = [("If-None-Match", "hash")] }
150167 assertStatus 304 req
151168 assertNoHeader "Etag" req
169+ -}