+{-# LANGUAGE
+ GeneralizedNewtypeDeriving
+ , OverloadedStrings
+ , UnicodeSyntax
+ #-}
module Network.HTTP.Lucu.Headers
( Headers
, HasHeaders(..)
- , emptyHeaders -- Headers
+
+ , singleton
+
+ , toHeaders
+ , fromHeaders
+
+ , headersP
+ , printHeaders
)
where
+import Control.Applicative
+import Data.Ascii (Ascii, AsciiBuilder, CIAscii)
+import qualified Data.Ascii as A
+import Data.Attoparsec.Char8 as P
+import qualified Data.ByteString as BS
+import Data.Map (Map)
+import qualified Data.Map as M
+import qualified Data.Map.Unicode as M
+import Data.Monoid
+import Data.Monoid.Unicode
+import Network.HTTP.Lucu.Parser.Http
+import Network.HTTP.Lucu.Utils
+import Prelude.Unicode
-import qualified Data.ByteString.Lazy.Char8 as B
-import Data.ByteString.Lazy.Char8 (ByteString)
-import Data.Char
-import Data.List
-
-type Headers = [ (ByteString, ByteString) ]
+newtype Headers
+ = Headers (Map CIAscii Ascii)
+ deriving (Eq, Show, Monoid)
class HasHeaders a where
- getHeaders :: a -> Headers
- setHeaders :: a -> Headers -> a
+ getHeaders ∷ a → Headers
+ setHeaders ∷ a → Headers → a
+
+ getHeader ∷ CIAscii → a → Maybe Ascii
+ getHeader key a
+ = case getHeaders a of
+ Headers m → M.lookup key m
+
+ hasHeader ∷ CIAscii → a → Bool
+ {-# INLINE hasHeader #-}
+ hasHeader key a
+ = case getHeaders a of
+ Headers m → key M.∈ m
+
+ getCIHeader ∷ CIAscii → a → Maybe CIAscii
+ {-# INLINE getCIHeader #-}
+ getCIHeader key a
+ = A.toCIAscii <$> getHeader key a
+
+ deleteHeader ∷ CIAscii → a → a
+ {-# INLINE deleteHeader #-}
+ deleteHeader key a
+ = case getHeaders a of
+ Headers m
+ → setHeaders a $ Headers $ M.delete key m
- getHeader :: a -> ByteString -> Maybe ByteString
- getHeader a key
- = fmap snd $ find (noCaseEq key . fst) (getHeaders a)
+ setHeader ∷ CIAscii → Ascii → a → a
+ {-# INLINE setHeader #-}
+ setHeader key val a
+ = case getHeaders a of
+ Headers m
+ → setHeaders a $ Headers $ M.insert key val m
- deleteHeader :: a -> ByteString -> a
- deleteHeader a key
- = setHeaders a $ filter (not . noCaseEq key . fst) (getHeaders a)
+instance HasHeaders Headers where
+ getHeaders = id
+ setHeaders _ = id
- addHeader :: a -> ByteString -> ByteString -> a
- addHeader a key val
- = setHeaders a $ (getHeaders a) ++ [(key, val)]
+singleton ∷ CIAscii → Ascii → Headers
+{-# INLINE singleton #-}
+singleton key val
+ = Headers $ M.singleton key val
- setHeader :: a -> ByteString -> ByteString -> a
- setHeader a key val
- = let list = getHeaders a
- deleted = filter (not . noCaseEq key . fst) list
- added = deleted ++ [(key, val)]
- in
- setHeaders a added
+toHeaders ∷ [(CIAscii, Ascii)] → Headers
+{-# INLINE toHeaders #-}
+toHeaders = flip mkHeaders (∅)
-noCaseEq :: ByteString -> ByteString -> Bool
-noCaseEq a b
- = (B.map toLower a) == (B.map toLower b)
+mkHeaders ∷ [(CIAscii, Ascii)] → Headers → Headers
+mkHeaders [] (Headers m) = Headers m
+mkHeaders ((key, val):xs) (Headers m)
+ = mkHeaders xs $ Headers $
+ case M.lookup key m of
+ Nothing → M.insert key val m
+ Just old → M.insert key (merge old val) m
+ where
+ merge ∷ Ascii → Ascii → Ascii
+ {-# INLINE merge #-}
+ merge a b
+ | nullA a ∧ nullA b = (∅)
+ | nullA a = b
+ | nullA b = a
+ | otherwise = a ⊕ ", " ⊕ b
+
+ nullA ∷ Ascii → Bool
+ {-# INLINE nullA #-}
+ nullA = BS.null ∘ A.toByteString
+
+fromHeaders ∷ Headers → [(CIAscii, Ascii)]
+fromHeaders (Headers m) = M.toList m
+
+{-
+ message-header = field-name ":" [ field-value ]
+ field-name = token
+ field-value = *( field-content | LWS )
+ field-content = <field-value を構成し、*TEXT あるいは
+ token, separators, quoted-string を連結
+ したものから成る OCTET>
+ field-value の先頭および末尾にある LWS は全て削除され、それ以外の
+ LWS は單一の SP に變換される。
+-}
+headersP ∷ Parser Headers
+{-# INLINEABLE headersP #-}
+headersP = do xs ← P.many header
+ crlf
+ return $ toHeaders xs
+ where
+ header ∷ Parser (CIAscii, Ascii)
+ header = do name ← A.toCIAscii <$> token
+ _ ← char ':'
+ skipMany lws
+ values ← sepBy content (try lws)
+ skipMany (try lws)
+ crlf
+ return (name, joinValues values)
+
+ content ∷ Parser Ascii
+ {-# INLINE content #-}
+ content = A.unsafeFromByteString
+ <$>
+ takeWhile1 (\c → (¬) (isSPHT c) ∧ isText c)
-emptyHeaders :: Headers
-emptyHeaders = []
\ No newline at end of file
+ joinValues ∷ [Ascii] → Ascii
+ {-# INLINE joinValues #-}
+ joinValues = A.fromAsciiBuilder ∘ joinWith "\x20" ∘ map A.toAsciiBuilder
+
+printHeaders ∷ Headers → AsciiBuilder
+printHeaders (Headers m)
+ = mconcat (map printHeader (M.toList m)) ⊕
+ A.toAsciiBuilder "\x0D\x0A"
+ where
+ printHeader ∷ (CIAscii, Ascii) → AsciiBuilder
+ printHeader (name, value)
+ = A.toAsciiBuilder (A.fromCIAscii name) ⊕
+ A.toAsciiBuilder ": " ⊕
+ A.toAsciiBuilder value ⊕
+ A.toAsciiBuilder "\x0D\x0A"