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Snap.Util.GZip: fix Vary header handling #337

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Snap.Util.GZip: fix Vary header handling #337

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12 changes: 7 additions & 5 deletions src/Snap/Util/GZip.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ import Data.Set (Set)
import qualified Data.Set as Set (fromList, member)
import Data.Typeable (Typeable)
import Prelude (Either (..), Eq (..), IO, Show (show), id, not, ($), ($!), (&&), (++), (||))
import Snap.Core (MonadSnap, clearContentLength, finishWith, getHeader, getRequest, getResponse, modifyResponse, modifyResponseBody, setHeader)
import Snap.Core (MonadSnap, HasHeaders, clearContentLength, finishWith, getHeader, getRequest, getResponse, modifyResponse, modifyResponseBody, setHeader, addHeader)
import Snap.Internal.Debug (debug)
import Snap.Internal.Parsing (fullyParse)
import System.IO.Streams (OutputStream)
Expand Down Expand Up @@ -176,15 +176,17 @@ compressibleMimeTypes = Set.fromList [ "application/x-font-truetype"
, "text/plain"
, "text/xml" ]



updateVaryHeader :: HasHeaders a => a -> a
updateVaryHeader resp = case getHeader "Accept-Encoding" resp of
Just "*" -> resp
_ -> addHeader "Vary" "Accept-Encoding" resp

------------------------------------------------------------------------------
gzipCompression :: MonadSnap m => ByteString -> m ()
gzipCompression ce = modifyResponse f
where
f r = setHeader "Content-Encoding" ce $
setHeader "Vary" "Accept-Encoding" $
updateVaryHeader $
clearContentLength $
modifyResponseBody gcompress r

Expand All @@ -194,7 +196,7 @@ compressCompression :: MonadSnap m => ByteString -> m ()
compressCompression ce = modifyResponse f
where
f r = setHeader "Content-Encoding" ce $
setHeader "Vary" "Accept-Encoding" $
updateVaryHeader $
clearContentLength $
modifyResponseBody ccompress r

Expand Down
17 changes: 17 additions & 0 deletions test/Snap/Util/GZip/Tests.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@ import Control.Applicative ((<$>))
tests :: [Test]
tests = [ testIdentity1
, testIdentity1_charset
, testIdentity1_vary
, testIdentity2
, testIdentity3
, testIdentity4
Expand Down Expand Up @@ -240,6 +241,22 @@ testIdentity1_charset = testProperty "gzip/identity1_charset" $
let s1 = GZip.decompress $ L.fromChunks [body]
assertEqual "" s s1

testIdentity1_vary :: Test
testIdentity1_vary = testProperty "gzip/identity1_vary" $
monadicIO $ forAllM arbitrary prop
where
prop :: L.ByteString -> PropertyM IO ()
prop s = liftQ $ do
(!_,!rsp) <- goGZip (seqSnap $ withCompression $ do
modifyResponse $ setHeader "Vary" "Origin"
textPlain s)
assertEqual "" (Just "gzip") $ getHeader "Content-Encoding" rsp
assertEqual "" (Just "Origin,Accept-Encoding") $ getHeader "Vary" rsp

body <- Test.getResponseBody rsp
let s1 = GZip.decompress $ L.fromChunks [body]
assertEqual "" s s1


------------------------------------------------------------------------------
testIdentity2 :: Test
Expand Down