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|
module Network.HTTP.Types.Method
(
Method
, methodGet
, methodPost
, methodHead
, methodPut
, methodDelete
, methodTrace
, methodConnect
, methodOptions
, methodPatch
, StdMethod(..)
, parseMethod
, renderMethod
, renderStdMethod
)
where
import Control.Arrow ((|||))
import Data.Array
import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as B8
-- | HTTP method (flat string type).
type Method = B.ByteString
-- | HTTP Method constants.
methodGet, methodPost, methodHead, methodPut, methodDelete, methodTrace, methodConnect, methodOptions, methodPatch :: Method
methodGet = renderStdMethod GET
methodPost = renderStdMethod POST
methodHead = renderStdMethod HEAD
methodPut = renderStdMethod PUT
methodDelete = renderStdMethod DELETE
methodTrace = renderStdMethod TRACE
methodConnect = renderStdMethod CONNECT
methodOptions = renderStdMethod OPTIONS
methodPatch = renderStdMethod PATCH
-- | HTTP standard method (as defined by RFC 2616, and PATCH which is defined
-- by RFC 5789).
data StdMethod
= GET
| POST
| HEAD
| PUT
| DELETE
| TRACE
| CONNECT
| OPTIONS
| PATCH
deriving (Read, Show, Eq, Ord, Enum, Bounded, Ix)
-- These are ordered by suspected frequency. More popular methods should go first.
-- The reason is that methodList is used with lookup.
-- lookup is probably faster for these few cases than setting up an elaborate data structure.
methodArray :: Array StdMethod Method
methodArray = listArray (minBound, maxBound) $ map (B8.pack . show) [minBound :: StdMethod .. maxBound]
methodList :: [(Method, StdMethod)]
methodList = map (\(a, b) -> (b, a)) (assocs methodArray)
-- | Convert a method 'ByteString' to a 'StdMethod' if possible.
parseMethod :: Method -> Either B.ByteString StdMethod
parseMethod bs = maybe (Left bs) Right $ lookup bs methodList
-- | Convert an algebraic method to a 'ByteString'.
renderMethod :: Either B.ByteString StdMethod -> Method
renderMethod = id ||| renderStdMethod
-- | Convert a 'StdMethod' to a 'ByteString'.
renderStdMethod :: StdMethod -> Method
renderStdMethod m = methodArray ! m
|
