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Fix overlapping MimeRender instances (#1376)

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fisx 2020-12-09 23:08:54 +01:00 committed by GitHub
parent 505e6d346b
commit 6ebb9e419e
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1 changed files with 25 additions and 8 deletions
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33
servant/src/Servant/API/UVerb.hs
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@ -36,7 +36,7 @@ where
import Data.Proxy (Proxy (Proxy))
import GHC.TypeLits (Nat)
import Network.HTTP.Types (Status, StdMethod)
import Servant.API.ContentTypes (NoContent, MimeRender(mimeRender), MimeUnrender(mimeUnrender))
import Servant.API.ContentTypes (JSON, PlainText, FormUrlEncoded, OctetStream, NoContent, MimeRender(mimeRender), MimeUnrender(mimeUnrender))
import Servant.API.Status (KnownStatus, statusVal)
import Servant.API.UVerb.Union
@ -69,13 +69,6 @@ instance (HasStatus a, HasStatuses as) => HasStatuses (a ': as) where
newtype WithStatus (k :: Nat) a = WithStatus a
deriving (Eq, Show)
instance MimeRender ctype a => MimeRender ctype (WithStatus _status a) where
mimeRender contentTypeProxy (WithStatus a) = mimeRender contentTypeProxy a
instance MimeUnrender ctype a => MimeUnrender ctype (WithStatus _status a) where
mimeUnrender contentTypeProxy input =
WithStatus <$> mimeUnrender contentTypeProxy input
-- | an instance of this typeclass assigns a HTTP status code to a return type
--
-- Example:
@ -105,3 +98,27 @@ instance KnownStatus n => HasStatus (WithStatus n a) where
-- Backwards compatibility is tricky, though: this type alias would mean people would have to
-- use 'respond' instead of 'pure' or 'return', so all old handlers would have to be rewritten.
data UVerb (method :: StdMethod) (contentTypes :: [*]) (as :: [*])
instance {-# OVERLAPPING #-} MimeRender JSON a => MimeRender JSON (WithStatus _status a) where
mimeRender contentTypeProxy (WithStatus a) = mimeRender contentTypeProxy a
instance {-# OVERLAPPING #-} MimeRender PlainText a => MimeRender PlainText (WithStatus _status a) where
mimeRender contentTypeProxy (WithStatus a) = mimeRender contentTypeProxy a
instance {-# OVERLAPPING #-} MimeRender FormUrlEncoded a => MimeRender FormUrlEncoded (WithStatus _status a) where
mimeRender contentTypeProxy (WithStatus a) = mimeRender contentTypeProxy a
instance {-# OVERLAPPING #-} MimeRender OctetStream a => MimeRender OctetStream (WithStatus _status a) where
mimeRender contentTypeProxy (WithStatus a) = mimeRender contentTypeProxy a
instance {-# OVERLAPPING #-} MimeUnrender JSON a => MimeUnrender JSON (WithStatus _status a) where
mimeUnrender contentTypeProxy input = WithStatus <$> mimeUnrender contentTypeProxy input
instance {-# OVERLAPPING #-} MimeUnrender PlainText a => MimeUnrender PlainText (WithStatus _status a) where
mimeUnrender contentTypeProxy input = WithStatus <$> mimeUnrender contentTypeProxy input
instance {-# OVERLAPPING #-} MimeUnrender FormUrlEncoded a => MimeUnrender FormUrlEncoded (WithStatus _status a) where
mimeUnrender contentTypeProxy input = WithStatus <$> mimeUnrender contentTypeProxy input
instance {-# OVERLAPPING #-} MimeUnrender OctetStream a => MimeUnrender OctetStream (WithStatus _status a) where
mimeUnrender contentTypeProxy input = WithStatus <$> mimeUnrender contentTypeProxy input