59 lines
2.2 KiB
Haskell
59 lines
2.2 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE FlexibleContexts #-}
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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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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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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 Data.Text (pack)
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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 lang () api)
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=> HasForeign lang () (Authorization sym a :> api) where
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type Foreign () (Authorization sym a :> api) = Foreign () api
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foreignFor lang ftype Proxy req = foreignFor lang ftype (Proxy :: Proxy api) $
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req & reqHeaders <>~
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[ ReplaceHeaderArg (Arg "Authorization" ())
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$ tokenType (pack . 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 lang () api)
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=> HasForeign lang () (MyLovelyHorse a :> api) where
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type Foreign () (MyLovelyHorse a :> api) = Foreign () api
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foreignFor lang ftype Proxy req = foreignFor lang ftype (Proxy :: Proxy api) $
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req & reqHeaders <>~ [ ReplaceHeaderArg (Arg "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 lang () api)
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=> HasForeign lang () (WhatsForDinner a :> api) where
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type Foreign () (WhatsForDinner a :> api) = Foreign () api
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foreignFor lang ftype Proxy req = foreignFor lang ftype (Proxy :: Proxy api) $
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req & reqHeaders <>~ [ ReplaceHeaderArg (Arg "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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