54 lines
2 KiB
Haskell
54 lines
2 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE KindSignatures #-}
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{-# LANGUAGE PolyKinds #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE TypeOperators #-}
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module Servant.JSSpec.CustomHeaders where
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import Control.Lens
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import Data.Monoid
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import Data.Proxy
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import GHC.TypeLits
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import Servant.JS.Internal
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-- | This is a hypothetical combinator that fetches an Authorization header.
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-- The symbol in the header denotes what kind of authentication we are
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-- using -- Basic, Digest, whatever.
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data Authorization (sym :: Symbol) a
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instance (KnownSymbol sym, HasForeign sublayout)
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=> HasForeign (Authorization sym a :> sublayout) where
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type Foreign (Authorization sym a :> sublayout) = Foreign sublayout
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foreignFor Proxy req = foreignFor (Proxy :: Proxy sublayout) $
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req & reqHeaders <>~ [ ReplaceHeaderArg "Authorization" $
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tokenType (symbolVal (Proxy :: Proxy sym)) ]
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where
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tokenType t = t <> " {Authorization}"
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-- | This is a combinator that fetches an X-MyLovelyHorse header.
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data MyLovelyHorse a
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instance (HasForeign sublayout)
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=> HasForeign (MyLovelyHorse a :> sublayout) where
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type Foreign (MyLovelyHorse a :> sublayout) = Foreign sublayout
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foreignFor Proxy req = foreignFor (Proxy :: Proxy sublayout) $
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req & reqHeaders <>~ [ ReplaceHeaderArg "X-MyLovelyHorse" tpl ]
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where
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tpl = "I am good friends with {X-MyLovelyHorse}"
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-- | This is a combinator that fetches an X-WhatsForDinner header.
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data WhatsForDinner a
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instance (HasForeign sublayout)
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=> HasForeign (WhatsForDinner a :> sublayout) where
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type Foreign (WhatsForDinner a :> sublayout) = Foreign sublayout
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foreignFor Proxy req = foreignFor (Proxy :: Proxy sublayout) $
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req & reqHeaders <>~ [ ReplaceHeaderArg "X-WhatsForDinner" tpl ]
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where
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tpl = "I would like {X-WhatsForDinner} with a cherry on top."
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