Yet Another Huge Changes

[Lucu.git] / Network / HTTP / Lucu / Preprocess.hs

diff --git a/Network/HTTP/Lucu/Preprocess.hs b/Network/HTTP/Lucu/Preprocess.hs
index 739dec89f6d6058486a00cf404e7d6a12b7280c9..8e3087ebae70654ae0b4a8f74b5e1f0a4102c466 100644 (file)
--- a/Network/HTTP/Lucu/Preprocess.hs
+++ b/Network/HTTP/Lucu/Preprocess.hs
@@ -12,11 +12,12 @@ module Network.HTTP.Lucu.Preprocess
     where
 import Control.Applicative
 import Control.Monad
-import Control.Monad.State
+import Control.Monad.State.Strict
 import Data.Ascii (Ascii)
 import qualified Data.Ascii as A
 import qualified Data.ByteString.Char8 as C8
 import Data.Maybe
+import qualified Data.Strict.Maybe as S
 import Data.Text (Text)
 import qualified Data.Text as T
 import qualified Data.Text.Encoding as T
@@ -30,12 +31,13 @@ import Prelude.Unicode
 
 data AugmentedRequest
     = AugmentedRequest {
-        arRequest          ∷ !(Maybe Request)
+        arRequest          ∷ !Request
       , arInitialStatus    ∷ !StatusCode
-      , arWillClose        ∷ !Bool
+      , arWillChunkBody    ∷ !Bool
       , arWillDiscardBody  ∷ !Bool
-      , arExpectedContinue ∷ !(Maybe Bool)
-      , arReqBodyLength    ∷ !(Maybe RequestBodyLength)
+      , arWillClose        ∷ !Bool
+      , arExpectedContinue ∷ !Bool
+      , arReqBodyLength    ∷ !(S.Maybe RequestBodyLength)
       }
 
 data RequestBodyLength
@@ -43,42 +45,20 @@ data RequestBodyLength
     | Chunked
     deriving (Eq, Show)
 
-preprocess ∷ Text
-           → PortNumber
-           → Either StatusCode Request
-           → AugmentedRequest
-preprocess localHost localPort request
-    = case request of
-        Right req
-            → preprocess' localHost localPort req
-        Left sc
-            → unparsable sc
-
-unparsable ∷ StatusCode → AugmentedRequest
-unparsable sc
-    = AugmentedRequest {
-        arRequest          = Nothing
-      , arInitialStatus    = sc
-      , arWillClose        = True
-      , arWillDiscardBody  = False
-      , arExpectedContinue = Nothing
-      , arReqBodyLength    = Nothing
-      }
-
-preprocess' ∷ Text → PortNumber → Request → AugmentedRequest
-preprocess' localHost localPort req@(Request {..})
+preprocess ∷ Text → PortNumber → Request → AugmentedRequest
+preprocess localHost localPort req@(Request {..})
     = execState go initialAR
     where
       initialAR ∷ AugmentedRequest
       initialAR = AugmentedRequest {
-                    arRequest          = Just req
+                    arRequest          = req
                   , arInitialStatus    = Ok
-                  , arWillClose        = False
+                  , arWillChunkBody    = False
                   , arWillDiscardBody  = False
-                  , arExpectedContinue = Just False
-                  , arReqBodyLength    = Nothing
+                  , arWillClose        = False
+                  , arExpectedContinue = False
+                  , arReqBodyLength    = S.Nothing
                   }
-
       go ∷ State AugmentedRequest ()
       go = do examineHttpVersion
               examineMethod
@@ -88,7 +68,7 @@ preprocess' localHost localPort req@(Request {..})
 
 setRequest ∷ Request → State AugmentedRequest ()
 setRequest req
-    = modify $ \ar → ar { arRequest = Just req }
+    = modify $ \ar → ar { arRequest = req }
 
 setStatus ∷ StatusCode → State AugmentedRequest ()
 setStatus sc
@@ -98,25 +78,25 @@ setWillClose ∷ Bool → State AugmentedRequest ()
 setWillClose b
     = modify $ \ar → ar { arWillClose = b }
 
-setBodyLength ∷ Maybe RequestBodyLength → State AugmentedRequest ()
+setBodyLength ∷ S.Maybe RequestBodyLength → State AugmentedRequest ()
 setBodyLength len
     = modify $ \ar → ar { arReqBodyLength = len }
 
 examineHttpVersion ∷ State AugmentedRequest ()
 examineHttpVersion
-    = do req ← gets (fromJust ∘ arRequest)
+    = do req ← gets arRequest
          case reqVersion req of
            -- HTTP/1.0 requests can't Keep-Alive.
            HttpVersion 1 0
                → setWillClose True
            HttpVersion 1 1
-               → return ()
+               → modify $ \ar → ar { arWillChunkBody = True }
            _   → do setStatus    HttpVersionNotSupported
                     setWillClose True
 
 examineMethod ∷ State AugmentedRequest ()
 examineMethod
-    = do req ← gets (fromJust ∘ arRequest)
+    = do req ← gets arRequest
          case reqMethod req of
            GET    → return ()
            HEAD   → modify $ \ar → ar { arWillDiscardBody = True }
@@ -127,7 +107,7 @@ examineMethod
 
 examineAuthority ∷ Text → PortNumber → State AugmentedRequest ()
 examineAuthority localHost localPort
-    = do req ← gets (fromJust ∘ arRequest)
+    = do req ← gets arRequest
          when (isNothing $ uriAuthority $ reqURI req) $
              case reqVersion req of
                -- HTTP/1.0 requests have no Host header so complete it
@@ -178,13 +158,13 @@ updateAuthority host port req
 
 examineHeaders ∷ State AugmentedRequest ()
 examineHeaders
-    = do req ← gets (fromJust ∘ arRequest)
+    = do req ← gets arRequest
 
          case getCIHeader "Expect" req of
            Nothing → return ()
            Just v
                | v ≡ "100-continue"
-                   → modify $ \ar → ar { arExpectedContinue = Just True }
+                   → modify $ \ar → ar { arExpectedContinue = True }
                | otherwise
                    → setStatus ExpectationFailed
 
@@ -194,7 +174,7 @@ examineHeaders
                | v ≡ "identity"
                    → return ()
                | v ≡ "chunked"
-                   → setBodyLength $ Just Chunked
+                   → setBodyLength $ S.Just Chunked
                | otherwise
                    → setStatus NotImplemented
 
@@ -203,7 +183,7 @@ examineHeaders
            Just value → case C8.readInt value of
                            Just (len, garbage)
                                | C8.null garbage ∧ len ≥ 0
-                                   → setBodyLength $ Just $ Fixed len
+                                   → setBodyLength $ S.Just $ Fixed len
                            _       → setStatus BadRequest
 
          case getCIHeader "Connection" req of
@@ -214,13 +194,13 @@ examineHeaders
 
 examineBodyLength ∷ State AugmentedRequest ()
 examineBodyLength
-    = do req ← gets (fromJust ∘ arRequest)
+    = do req ← gets arRequest
          len ← gets arReqBodyLength
          if reqMustHaveBody req then
              -- POST and PUT requests must have an entity body.
-             when (isNothing len)
+             when (S.isNothing len)
                  $ setStatus LengthRequired
          else
              -- Other requests must NOT have an entity body.
-             when (isJust len)
+             when (S.isJust len)
                  $ setStatus BadRequest