2 GeneralizedNewtypeDeriving
6 -- |An internal module for HTTP headers.
7 module Network.HTTP.Lucu.Headers
20 import Control.Applicative
22 import Data.Ascii (Ascii, AsciiBuilder, CIAscii)
23 import qualified Data.Ascii as A
24 import Data.Attoparsec.Char8 as P
25 import qualified Data.ByteString as BS
28 import qualified Data.Map as M
29 import qualified Data.Map.Unicode as M
31 import Data.Monoid.Unicode
32 import Network.HTTP.Lucu.Parser.Http
33 import Prelude.Unicode
36 = Headers (Map CIAscii Ascii)
37 deriving (Eq, Show, Monoid)
39 class HasHeaders a where
40 getHeaders ∷ a → Headers
41 setHeaders ∷ a → Headers → a
43 getHeader ∷ CIAscii → a → Maybe Ascii
45 = case getHeaders a of
46 Headers m → M.lookup key m
48 hasHeader ∷ CIAscii → a → Bool
49 {-# INLINE hasHeader #-}
51 = case getHeaders a of
54 getCIHeader ∷ CIAscii → a → Maybe CIAscii
55 {-# INLINE getCIHeader #-}
57 = A.toCIAscii <$> getHeader key a
59 deleteHeader ∷ CIAscii → a → a
60 {-# INLINE deleteHeader #-}
62 = case getHeaders a of
64 → setHeaders a $ Headers $ M.delete key m
66 setHeader ∷ CIAscii → Ascii → a → a
67 {-# INLINE setHeader #-}
69 = case getHeaders a of
71 → setHeaders a $ Headers $ M.insert key val m
73 instance HasHeaders Headers where
77 singleton ∷ CIAscii → Ascii → Headers
78 {-# INLINE singleton #-}
80 = Headers $ M.singleton key val
82 toHeaders ∷ [(CIAscii, Ascii)] → Headers
83 {-# INLINE toHeaders #-}
84 toHeaders = flip mkHeaders (∅)
86 mkHeaders ∷ [(CIAscii, Ascii)] → Headers → Headers
87 mkHeaders [] (Headers m) = Headers m
88 mkHeaders ((key, val):xs) (Headers m)
89 = mkHeaders xs $ Headers $
90 case M.lookup key m of
91 Nothing → M.insert key val m
92 Just old → M.insert key (merge old val) m
94 merge ∷ Ascii → Ascii → Ascii
97 | nullA a ∧ nullA b = (∅)
100 | otherwise = a ⊕ ", " ⊕ b
104 nullA = BS.null ∘ A.toByteString
106 fromHeaders ∷ Headers → [(CIAscii, Ascii)]
107 fromHeaders (Headers m) = M.toList m
110 message-header = field-name ":" [ field-value ]
112 field-value = *( field-content | LWS )
113 field-content = <field-value を構成し、*TEXT あるいは
114 token, separators, quoted-string を連結
117 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
120 headers ∷ Parser Headers
121 {-# INLINEABLE headers #-}
122 headers = do xs ← P.many header
124 return $ toHeaders xs
126 header ∷ Parser (CIAscii, Ascii)
127 header = do name ← A.toCIAscii <$> token
130 values ← content `sepBy` try lws
133 return (name, joinValues values)
135 content ∷ Parser Ascii
136 {-# INLINE content #-}
137 content = A.unsafeFromByteString
139 takeWhile1 (\c → isText c ∧ c ≢ '\x20')
141 joinValues ∷ [Ascii] → Ascii
142 {-# INLINE joinValues #-}
143 joinValues = A.fromAsciiBuilder
145 ∘ intersperse (A.toAsciiBuilder "\x20")
146 ∘ map A.toAsciiBuilder
148 printHeaders ∷ Headers → AsciiBuilder
149 printHeaders (Headers m)
150 = mconcat (map printHeader (M.toList m)) ⊕
151 A.toAsciiBuilder "\x0D\x0A"
153 printHeader ∷ (CIAscii, Ascii) → AsciiBuilder
154 printHeader (name, value)
155 = A.toAsciiBuilder (A.fromCIAscii name) ⊕
156 A.toAsciiBuilder ": " ⊕
157 A.toAsciiBuilder value ⊕
158 A.toAsciiBuilder "\x0D\x0A"