symantic-http-server (empty) → 0.0.0.20190324
raw patch · 4 files changed
+1622/−0 lines, 4 filesdep +basedep +base64-bytestringdep +bytestring
Dependencies added: base, base64-bytestring, bytestring, containers, http-api-data, http-media, http-types, monad-classes, network-uri, stm, symantic-http, text, time, transformers, wai, warp, word8
Files
- COPYING +674/−0
- Symantic/HTTP/Server.hs +857/−0
- stack.yaml +10/−0
- symantic-http-server.cabal +81/−0
+ COPYING view
@@ -0,0 +1,674 @@+ GNU GENERAL PUBLIC LICENSE+ Version 3, 29 June 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++ Preamble++ The GNU General Public License is a free, copyleft license for+software and other kinds of works.++ The licenses for most software and other practical works are designed+to take away your freedom to share and change the works. By contrast,+the GNU General Public License is intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users. We, the Free Software Foundation, use the+GNU General Public License for most of our software; it applies also to+any other work released this way by its authors. You can apply it to+your programs, too.++ When we speak of free software, we are referring to freedom, not+price. 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+ Symantic/HTTP/Server.hs view
@@ -0,0 +1,857 @@+{-# LANGUAGE GADTs #-}+{-# LANGUAGE ConstraintKinds #-}+{-# LANGUAGE DeriveFunctor #-}+{-# LANGUAGE GeneralizedNewtypeDeriving #-}+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE Rank2Types #-}+{-# LANGUAGE UndecidableInstances #-}+{-# OPTIONS_GHC -fno-warn-orphans #-}+-- | See <https://hackage.haskell.org/package/symantic-http-demo symantic-http-demo>+-- for an example of how to use this module.+module Symantic.HTTP.Server where++import Control.Arrow (first)+import Control.Applicative (Applicative(..))+import Control.Monad (Monad(..), unless, sequence, guard, (=<<))+import Control.Monad.Trans.Class (MonadTrans(..))+import Control.Monad.Trans.Except (ExceptT(..), runExceptT)+import Data.Bool+import Data.Either (Either(..))+import Data.Eq (Eq(..))+import Data.Function (($), (.), id)+import Data.Functor (Functor(..), (<$>))+import Data.Int (Int)+import Data.Maybe (Maybe(..), fromMaybe, catMaybes)+import Data.Monoid (Monoid(..))+import Data.Ord (Ord(..))+import Data.Proxy (Proxy(..))+import Data.Semigroup (Semigroup(..))+import Data.String (String, IsString(..))+import Data.Text (Text)+import System.IO (IO)+import Text.Show (Show(..))+import qualified Control.Monad.Classes as MC+import qualified Control.Monad.Trans.Cont as C+import qualified Control.Monad.Trans.Reader as R+import qualified Control.Monad.Trans.State.Strict as S+import qualified Control.Monad.Trans.Writer.Strict as W+import qualified Data.ByteString as BS+import qualified Data.ByteString.Base64 as BS64+import qualified Data.ByteString.Builder as BSB+import qualified Data.ByteString.Lazy as BSL+import qualified Data.List as List+import qualified Data.List.NonEmpty as NonEmpty+import qualified Data.Text.Encoding as Text+import qualified Data.Word8 as Word8+import qualified Network.HTTP.Media as Media+import qualified Network.HTTP.Types as HTTP+import qualified Network.HTTP.Types.Header as HTTP+import qualified Network.Wai as Wai+import qualified Web.HttpApiData as Web++import Symantic.HTTP++-- * Type 'Server'+-- | @'Server' responses k@ is a recipe to produce an 'Wai.Application'+-- from arguments 'responses' (one per number of alternative routes),+-- separated by (':!:').+--+-- 'Server' is analogous to a scanf using a format customized for HTTP routing.+--+-- The multiple 'ServerCheckT' monad transformers are there+-- to prioritize the errors according to the type of check raising them,+-- instead of the order of the combinators within an actual API specification.+newtype Server responses k = Server { unServer ::+ S.StateT ServerState+ (ServerCheckT [ServerErrorBody] -- 8th check, 400 error+ (ServerCheckT [ServerErrorHeader] -- 7th check, 400 error+ (ServerCheckT [ServerErrorQuery] -- 6th check, 400 error+ (ServerCheckT [ServerErrorContentType] -- 5th check, 415 error+ (ServerCheckT [ServerErrorAccept] -- 4th check, 406 error+ (ServerCheckT [ServerErrorBasicAuth] -- 3rd check, 401 or 403 error+ (ServerCheckT [ServerErrorMethod] -- 2nd check, 405 error+ (ServerCheckT [ServerErrorPath] -- 1st check, 404 error+ IO))))))))+ (responses -> k)+ } deriving (Functor)++-- | @'server' api responses@ returns a 'Wai.Application'+-- ready to be given to @Warp.run 80@.+server ::+ Server responses (Response Server) ->+ responses ->+ Wai.Application+server (Server api) responses rq re = do+ lrPath <- runServerChecks api $ ServerState rq+ case lrPath of+ Left err -> respondError HTTP.status404 [] err+ Right lrMethod ->+ case lrMethod of+ Left err -> respondError HTTP.status405 [] err+ Right lrBasicAuth ->+ case lrBasicAuth of+ Left err ->+ case failError err of+ [] -> respondError HTTP.status500 [] err+ ServerErrorBasicAuth realm ba:_ ->+ case ba of+ BasicAuth_Unauthorized ->+ respondError HTTP.status403 [] err+ _ ->+ respondError HTTP.status401+ [ ( HTTP.hWWWAuthenticate+ , "Basic realm=\""<>Web.toHeader realm<>"\""+ ) ] err+ Right lrAccept ->+ case lrAccept of+ Left err -> respondError HTTP.status406 [] err+ Right lrContentType ->+ case lrContentType of+ Left err -> respondError HTTP.status415 [] err+ Right lrQuery ->+ case lrQuery of+ Left err -> respondError HTTP.status400 [] err+ Right lrHeader ->+ case lrHeader of+ Left err -> respondError HTTP.status400 [] err+ Right lrBody ->+ case lrBody of+ Left err -> respondError HTTP.status400 [] err+ Right (app, _st) ->+ app responses rq re+ where+ respondError ::+ Show err =>+ HTTP.Status ->+ [(HTTP.HeaderName, HeaderValue)] ->+ err -> IO Wai.ResponseReceived+ respondError st hs err =+ -- Trace.trace (show err) $+ re $ Wai.responseLBS st+ ( (HTTP.hContentType, Media.renderHeader $ mediaType @PlainText)+ : hs+ ) (fromString $ show err) -- TODO: see what to return in the body++-- | Unwrap the 'ExceptT' constructors to reach the 'Either' constructors.+runServerChecks ::+ S.StateT ServerState (ExceptT e1 (ExceptT e2 (ExceptT e3 (ExceptT e4 (ExceptT e5 (ExceptT e6 (ExceptT e7 (ExceptT e8 IO)))))))) a ->+ ServerState -> IO (Either e8 (Either e7 (Either e6 (Either e5 (Either e4 (Either e3 (Either e2 (Either e1 (a, ServerState)))))))))+runServerChecks s st =+ runExceptT $+ runExceptT $+ runExceptT $+ runExceptT $+ runExceptT $+ runExceptT $+ runExceptT $+ runExceptT $+ S.runStateT s st++-- ** Type 'ServerCheckT'+type ServerCheckT e = ExceptT (Fail e)++-- *** Type 'RouteResult'+type RouteResult e = Either (Fail e)++-- *** Type 'Fail'+data Fail e+ = Fail ServerState e -- ^ Keep trying other paths. 404, 405 or 406.+ | FailFatal !ServerState !e -- ^ Don't try other paths.+ deriving (Show)+failState :: Fail e -> ServerState+failState (Fail st _) = st+failState (FailFatal st _) = st+failError :: Fail e -> e+failError (Fail _st e) = e+failError (FailFatal _st e) = e+instance Semigroup e => Semigroup (Fail e) where+ Fail _ x <> Fail st y = Fail st (x<>y)+ FailFatal _ x <> Fail st y = FailFatal st (x<>y)+ Fail _ x <> FailFatal st y = FailFatal st (x<>y)+ FailFatal _ x <> FailFatal st y = FailFatal st (x<>y)++-- ** Type 'ServerState'+newtype ServerState = ServerState+ { serverState_request :: Wai.Request+ }+instance Show ServerState where+ show _ = "ServerState"++instance Cat Server where+ (<.>) ::+ forall a b c repr.+ repr ~ Server =>+ repr a b -> repr b c -> repr a c+ -- NOTE: if x fails, run y to see if it fails on a more prioritized check.+ -- And if so, fail with y instead of x.+ -- + -- This long spaghetti code may probably be avoided+ -- with a more sophisticated 'Server' using a binary tree+ -- instead of nested 'Either's, so that its 'Monad' instance+ -- would do the right thing. But to my mind,+ -- with the very few priorities of checks currently needed,+ -- this is not worth the cognitive pain to design it.+ -- Some copying/pasting/adapting will do for now.+ Server x <.> Server y = Server $+ S.StateT $ \st -> do+ xPath <- MC.exec @IO $ runServerChecks x st+ case xPath of+ Left xe -> MC.throw xe+ Right xMethod ->+ case xMethod of+ Left xe -> do+ yPath <- MC.exec @IO $ runServerChecks y (failState xe)+ case yPath of+ Left ye -> MC.throw ye+ Right _yMethod -> MC.throw xe+ Right xBasicAuth ->+ case xBasicAuth of+ Left xe -> do+ yPath <- MC.exec @IO $ runServerChecks y (failState xe)+ case yPath of+ Left ye -> MC.throw ye+ Right yMethod ->+ case yMethod of+ Left ye -> MC.throw ye+ Right _yBasicAuth -> MC.throw xe+ Right xAccept ->+ case xAccept of+ Left xe -> do+ yPath <- MC.exec @IO $ runServerChecks y (failState xe)+ case yPath of+ Left ye -> MC.throw ye+ Right yMethod ->+ case yMethod of+ Left ye -> MC.throw ye+ Right yBasicAuth ->+ case yBasicAuth of+ Left ye -> MC.throw ye+ Right _yAccept -> MC.throw xe+ Right xContentType ->+ case xContentType of+ Left xe -> do+ yPath <- MC.exec @IO $ runServerChecks y (failState xe)+ case yPath of+ Left ye -> MC.throw ye+ Right yMethod ->+ case yMethod of+ Left ye -> MC.throw ye+ Right yBasicAuth ->+ case yBasicAuth of+ Left ye -> MC.throw ye+ Right yAccept ->+ case yAccept of+ Left ye -> MC.throw ye+ Right _yQuery -> MC.throw xe+ Right xQuery ->+ case xQuery of+ Left xe -> do+ yPath <- MC.exec @IO $ runServerChecks y (failState xe)+ case yPath of+ Left ye -> MC.throw ye+ Right yMethod ->+ case yMethod of+ Left ye -> MC.throw ye+ Right yBasicAuth ->+ case yBasicAuth of+ Left ye -> MC.throw ye+ Right yAccept ->+ case yAccept of+ Left ye -> MC.throw ye+ Right yQuery ->+ case yQuery of+ Left ye -> MC.throw ye+ Right _yHeader -> MC.throw xe+ Right xHeader ->+ case xHeader of+ Left xe -> do+ yPath <- MC.exec @IO $ runServerChecks y (failState xe)+ case yPath of+ Left ye -> MC.throw ye+ Right yMethod ->+ case yMethod of+ Left ye -> MC.throw ye+ Right yBasicAuth ->+ case yBasicAuth of+ Left ye -> MC.throw ye+ Right yAccept ->+ case yAccept of+ Left ye -> MC.throw ye+ Right yQuery ->+ case yQuery of+ Left ye -> MC.throw ye+ Right yHeader ->+ case yHeader of+ Left ye -> MC.throw ye+ Right _yBody -> MC.throw xe+ Right xBody ->+ case xBody of+ Left xe -> do+ yPath <- MC.exec @IO $ runServerChecks y (failState xe)+ case yPath of+ Left ye -> MC.throw ye+ Right yMethod ->+ case yMethod of+ Left ye -> MC.throw ye+ Right yBasicAuth ->+ case yBasicAuth of+ Left ye -> MC.throw ye+ Right yAccept ->+ case yAccept of+ Left ye -> MC.throw ye+ Right yQuery ->+ case yQuery of+ Left ye -> MC.throw ye+ Right yHeader ->+ case yHeader of+ Left ye -> MC.throw ye+ Right _yBody -> MC.throw xe+ Right (a2b, st') ->+ (first (. a2b)) <$> S.runStateT y st'+instance Alt Server where+ Server x <!> Server y = Server $+ S.StateT $ \st -> do+ xPath <- MC.exec @IO $ runServerChecks x st+ yPath <- MC.exec @IO $ runServerChecks y st+ let fy = (first (\b2k (_a:!:b) -> b2k b) <$>)+ case xPath of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left ye -> MC.throw (xe<>ye)+ Right yMethod ->+ fy $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $+ return $ Right yMethod+ Right xMethod ->+ case xMethod of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left _ye -> MC.throw xe+ Right yMethod ->+ case yMethod of+ Left ye -> MC.throw (xe<>ye)+ Right yBasicAuth ->+ fy $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $+ return $ Right $ yBasicAuth+ Right xBasicAuth ->+ case xBasicAuth of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left _ye -> MC.throw xe+ Right yMethod ->+ case yMethod of+ Left _ye -> MC.throw xe+ Right yBasicAuth ->+ case yBasicAuth of+ Left ye -> MC.throw (xe<>ye)+ Right yAccept ->+ fy $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $+ return $ Right yAccept+ Right xAccept ->+ case xAccept of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left _ye -> MC.throw xe+ Right yMethod ->+ case yMethod of+ Left _ye -> MC.throw xe+ Right yBasicAuth ->+ case yBasicAuth of+ Left _ye -> MC.throw xe+ Right yAccept ->+ case yAccept of+ Left ye -> MC.throw (xe<>ye)+ Right yContentType ->+ fy $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ ExceptT $+ return $ Right yContentType+ Right xContentType ->+ case xContentType of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left _ye -> MC.throw xe+ Right yMethod ->+ case yMethod of+ Left _ye -> MC.throw xe+ Right yBasicAuth ->+ case yBasicAuth of+ Left _ye -> MC.throw xe+ Right yAccept ->+ case yAccept of+ Left _ye -> MC.throw xe+ Right yContentType ->+ case yContentType of+ Left ye -> MC.throw (xe<>ye)+ Right yQuery ->+ fy $ ExceptT $ ExceptT $ ExceptT $ ExceptT $+ return $ Right yQuery+ Right xQuery ->+ case xQuery of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left _ye -> MC.throw xe+ Right yMethod ->+ case yMethod of+ Left _ye -> MC.throw xe+ Right yBasicAuth ->+ case yBasicAuth of+ Left _ye -> MC.throw xe+ Right yAccept ->+ case yAccept of+ Left _ye -> MC.throw xe+ Right yContentType ->+ case yContentType of+ Left _ye -> MC.throw xe+ Right yQuery ->+ case yQuery of+ Left ye -> MC.throw (xe<>ye)+ Right yHeader ->+ fy $ ExceptT $ ExceptT $ ExceptT $+ return $ Right yHeader+ Right xHeader ->+ case xHeader of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left _ye -> MC.throw xe+ Right yMethod ->+ case yMethod of+ Left _ye -> MC.throw xe+ Right yBasicAuth ->+ case yBasicAuth of+ Left _ye -> MC.throw xe+ Right yAccept ->+ case yAccept of+ Left _ye -> MC.throw xe+ Right yContentType ->+ case yContentType of+ Left _ye -> MC.throw xe+ Right yQuery ->+ case yQuery of+ Left _ye -> MC.throw xe+ Right yHeader ->+ case yHeader of+ Left ye -> MC.throw (xe<>ye)+ Right yBody ->+ fy $ ExceptT $ ExceptT $+ return $ Right yBody+ Right xBody ->+ case xBody of+ Left xe | FailFatal{} <- xe -> MC.throw xe+ | otherwise ->+ case yPath of+ Left _ye -> MC.throw xe+ Right yMethod ->+ case yMethod of+ Left _ye -> MC.throw xe+ Right yBasicAuth ->+ case yBasicAuth of+ Left _ye -> MC.throw xe+ Right yAccept ->+ case yAccept of+ Left _ye -> MC.throw xe+ Right yContentType ->+ case yContentType of+ Left _ye -> MC.throw xe+ Right yQuery ->+ case yQuery of+ Left _ye -> MC.throw xe+ Right yHeader ->+ case yHeader of+ Left _ye -> MC.throw xe+ Right yBody ->+ case yBody of+ Left ye -> MC.throw (xe<>ye)+ Right yr ->+ fy $ ExceptT $+ return $ Right yr+ Right xr ->+ return $ first (\a2k (a:!:_b) -> a2k a) xr+instance Pro Server where+ dimap a2b _b2a (Server r) = Server $ (\k b2k -> k (b2k . a2b)) <$> r++-- ** Type 'ServerErrorPath'+newtype ServerErrorPath = ServerErrorPath Text+ deriving (Eq, Show)+instance HTTP_Path Server where+ type PathConstraint Server a = Web.FromHttpApiData a+ segment expSegment = Server $ do+ st@ServerState+ { serverState_request = req+ } <- S.get+ case Wai.pathInfo req of+ [] -> MC.throw $ Fail st [ServerErrorPath "empty path segment"]+ [""] -> MC.throw $ Fail st [ServerErrorPath "trailing slash"]+ curr:next+ | curr /= expSegment ->+ MC.throw $ Fail st [ServerErrorPath $ "expected: "<>expSegment<>" but got: "<>curr]+ | otherwise -> do+ S.put st+ { serverState_request = req{ Wai.pathInfo = next }+ }+ return id+ capture' :: forall a k. PathConstraint Server a => Name -> Server (a -> k) k+ capture' name = Server $ do+ st@ServerState+ { serverState_request = req+ } <- S.get+ case Wai.pathInfo req of+ [] -> MC.throw $ Fail st [ServerErrorPath "empty"]+ [""] -> MC.throw $ Fail st [ServerErrorPath "trailing slash"]+ curr:next ->+ case Web.parseUrlPiece curr of+ Left err -> MC.throw $ Fail st [ServerErrorPath $ "capture: "<>fromString name<>": "<>err]+ Right a -> do+ S.put st+ { serverState_request = req{ Wai.pathInfo = next }+ }+ return ($ a)+ captureAll = Server $ do+ req <- S.gets serverState_request+ return ($ Wai.pathInfo req)++-- ** Type 'ServerErrorMethod'+data ServerErrorMethod = ServerErrorMethod+ deriving (Eq, Show)++-- | TODO: add its own error?+instance HTTP_Version Server where+ version exp = Server $ do+ st <- S.get+ let got = Wai.httpVersion $ serverState_request st+ if got == exp+ then return id+ else MC.throw $ Fail st [ServerErrorMethod] -- FIXME: ServerErrorVersion++-- ** Type 'ServerErrorAccept'+data ServerErrorAccept =+ ServerErrorAccept+ MediaTypes+ (Maybe (Either BS.ByteString MediaType))+ deriving (Eq, Show)++-- ** Type 'ServerErrorContentType'+data ServerErrorContentType = ServerErrorContentType+ deriving (Eq, Show)++-- ** Type 'ServerErrorQuery'+newtype ServerErrorQuery = ServerErrorQuery Text+ deriving (Show)+instance HTTP_Query Server where+ type QueryConstraint Server a = Web.FromHttpApiData a+ queryParams' name = Server $ do+ st <- S.get+ lift $ ExceptT $ ExceptT $ ExceptT $ return $+ let qs = Wai.queryString $ serverState_request st in+ let vals = catMaybes $ (<$> qs) $ \(n,v) ->+ if n == name+ then Web.parseQueryParam . Text.decodeUtf8 <$> v+ else Nothing in+ case sequence vals of+ Left err -> Left $ Fail st [ServerErrorQuery err]+ Right vs -> Right $ Right $ Right ($ vs)++-- ** Type 'ServerErrorHeader'+data ServerErrorHeader = ServerErrorHeader+ deriving (Eq, Show)+instance HTTP_Header Server where+ header n = Server $ do+ st <- S.get+ lift $ ExceptT $ ExceptT $ return $+ let hs = Wai.requestHeaders $ serverState_request st in+ case List.lookup n hs of+ Nothing -> Left $ Fail st [ServerErrorHeader]+ Just v -> Right $ Right ($ v)++-- ** Type 'ServerErrorBasicAuth'+data ServerErrorBasicAuth =+ ServerErrorBasicAuth BasicAuthRealm (BasicAuth ())+ deriving (Show)++-- ** Class 'ServerBasicAuth'+class ServerBasicAuth a where+ serverBasicAuth ::+ BasicAuthUser ->+ BasicAuthPass ->+ IO (BasicAuth a)++-- | WARNING: current implementation of Basic Access Authentication+-- is not immune to certian kinds of timing attacks.+-- Decoding payloads does not take a fixed amount of time.+instance HTTP_BasicAuth Server where+ type BasicAuthConstraint Server a = ServerBasicAuth a+ type BasicAuthArgs Server a k = a -> k+ basicAuth' realm = Server $ do+ st <- S.get+ let err e = MC.throw $ Fail st [ServerErrorBasicAuth realm e]+ case decodeAuthorization $ serverState_request st of+ Nothing -> err BasicAuth_BadPassword+ Just (user, pass) -> do+ MC.exec @IO (serverBasicAuth user pass) >>= \case+ BasicAuth_BadPassword -> err BasicAuth_BadPassword+ BasicAuth_NoSuchUser -> err BasicAuth_NoSuchUser+ BasicAuth_Unauthorized -> err BasicAuth_Unauthorized+ BasicAuth_Authorized a -> return ($ a)+ where+ -- | Find and decode an 'Authorization' header from the request as a Basic Auth+ decodeAuthorization :: Wai.Request -> Maybe (BasicAuthUser, BasicAuthPass)+ decodeAuthorization req = do+ hAuthorization <- List.lookup "Authorization" $ Wai.requestHeaders req+ let (basic, rest) = BS.break Word8.isSpace hAuthorization+ guard (BS.map Word8.toLower basic == "basic")+ let decoded = BS64.decodeLenient (BS.dropWhile Word8.isSpace rest)+ let (user, colon_pass) = BS.break (== Word8._colon) decoded+ (_, pass) <- BS.uncons colon_pass+ return (Text.decodeUtf8 user, Text.decodeUtf8 pass)++-- ** Type 'ServerErrorBody'+newtype ServerErrorBody = ServerErrorBody String+ deriving (Eq, Show)++-- *** Type 'ServerBodyArg'+newtype ServerBodyArg (ts::[*]) a = ServerBodyArg a++instance HTTP_Body Server where+ type BodyConstraint Server a ts = MimeTypes ts (MimeDecodable a)+ type BodyArg Server a ts = ServerBodyArg ts a+ body' ::+ forall a ts k repr.+ BodyConstraint repr a ts =>+ repr ~ Server =>+ repr (BodyArg repr a ts -> k) k+ body'= Server $ do+ st <- S.get+ lift $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ do+ let hs = Wai.requestHeaders $ serverState_request st+ let reqContentType =+ -- DOC: http://www.w3.org/Protocols/rfc2616/rfc2616-sec7.html#sec7.2.1+ -- DOC: http://www.w3.org/2001/tag/2002/0129-mime+ fromMaybe "application/octet-stream" $+ List.lookup HTTP.hContentType hs+ case matchContent @ts @(MimeDecodable a) reqContentType of+ Nothing -> return $ Left $ Fail st [ServerErrorContentType]+ Just (MimeType mt) -> do+ bodyBS <- MC.exec @IO $ Wai.requestBody $ serverState_request st+ return $ Right $ Right $ Right $+ -- NOTE: delay 'mimeDecode' after all checks+ case mimeDecode mt $ BSL.fromStrict bodyBS of+ Left err -> Left $ Fail st [ServerErrorBody err]+ Right a -> Right ($ ServerBodyArg a)++-- *** Type 'ServerBodyStreamArg'+newtype ServerBodyStreamArg as (ts::[*]) framing+ = ServerBodyStreamArg as+instance HTTP_BodyStream Server where+ type BodyStreamConstraint Server as ts framing =+ ( FramingDecode framing as+ , MC.MonadExec IO (FramingMonad as)+ , MimeTypes ts (MimeDecodable (FramingYield as))+ )+ type BodyStreamArg Server as ts framing =+ ServerBodyStreamArg as ts framing+ bodyStream' ::+ forall as ts framing k repr.+ BodyStreamConstraint repr as ts framing =>+ repr ~ Server =>+ repr (BodyStreamArg repr as ts framing -> k) k+ bodyStream'= Server $ do+ st <- S.get+ lift $ ExceptT $ ExceptT $ ExceptT $ ExceptT $ do+ let hs = Wai.requestHeaders $ serverState_request st+ let reqContentType =+ -- DOC: http://www.w3.org/Protocols/rfc2616/rfc2616-sec7.html#sec7.2.1+ -- DOC: http://www.w3.org/2001/tag/2002/0129-mime+ fromMaybe "application/octet-stream" $+ List.lookup HTTP.hContentType hs+ case matchContent @ts @(MimeDecodable (FramingYield as)) reqContentType of+ Nothing -> return $ Left $ Fail st [ServerErrorContentType]+ Just (MimeType mt) -> do+ let bodyBS = Wai.requestBody $ serverState_request st+ return $ Right $ Right $ Right $+ Right ($ ServerBodyStreamArg $+ framingDecode (Proxy @framing) (mimeDecode mt) $+ MC.exec @IO bodyBS+ )++-- * Type 'ServerResponse'+-- | A continuation for |server|'s users to respond.+--+-- This newtype has two uses :+-- * Carrying the 'ts' type variable to 'server'.+-- * Providing a 'return' for the simple response case+-- of 'HTTP.status200' and no extra headers.+newtype ServerRes (ts::[*]) m a+ = ServerResponse+ { unServerResponse :: m a+ } deriving (Functor, Applicative, Monad)+type ServerResponse ts m = ServerRes ts+ (R.ReaderT Wai.Request+ (W.WriterT HTTP.ResponseHeaders+ (W.WriterT HTTP.Status+ (C.ContT Wai.Response m))))+instance MonadTrans (ServerRes ts) where+ lift = ServerResponse+-- | All supported effects are handled by nested 'Monad's.+type instance MC.CanDo (ServerResponse ts m) eff = 'False+type instance MC.CanDo (C.ContT ts m) (MC.EffExec eff) = 'False++instance HTTP_Response Server where+ type ResponseConstraint Server a ts = MimeTypes ts (MimeEncodable a)+ type ResponseArgs Server a ts = ServerResponse ts IO a+ type Response Server =+ Wai.Request ->+ (Wai.Response -> IO Wai.ResponseReceived) ->+ IO Wai.ResponseReceived+ response ::+ forall a ts repr.+ ResponseConstraint repr a ts =>+ repr ~ Server =>+ HTTP.Method ->+ repr (ResponseArgs repr a ts)+ (Response repr)+ response expMethod = Server $ do+ st@ServerState+ { serverState_request = req+ } <- S.get+ + -- Check the path has been fully consumed+ unless (List.null $ Wai.pathInfo req) $+ MC.throw $ Fail st [ServerErrorPath "path is longer"]+ + -- Check the method+ let reqMethod = Wai.requestMethod $ serverState_request st+ unless (reqMethod == expMethod+ || reqMethod == HTTP.methodHead+ && expMethod == HTTP.methodGet) $+ MC.throw $ Fail st [ServerErrorMethod]+ + -- Check the Accept header+ let reqHeaders = Wai.requestHeaders $ serverState_request st+ MimeType reqAccept <- do+ case List.lookup HTTP.hAccept reqHeaders of+ Nothing ->+ return $ NonEmpty.head $ mimeTypes @ts @(MimeEncodable a)+ Just h ->+ case matchAccept @ts @(MimeEncodable a) h of+ Nothing -> MC.throw $ Fail st [ServerErrorAccept (mediaTypes @ts @(MimeEncodable a)) (Just (Left h))]+ Just mt -> return mt+ + return $ \(ServerResponse k) rq re -> re =<< do+ C.runContT (W.runWriterT $ W.runWriterT $ R.runReaderT k rq) $ \((a,hs),sta) ->+ return{-IO-} $+ Wai.responseLBS sta+ ((HTTP.hContentType, Media.renderHeader $ mediaTypeFor reqAccept):hs)+ (if reqMethod == HTTP.methodHead+ then ""+ else mimeEncode reqAccept a)++-- * Type 'ServerResponseStream'+--+-- This newtype has three uses :+-- * Carrying the 'framing' type variable to 'server'.+-- * Carrying the 'ts' type variable to 'server'.+-- * Providing a 'return' for the simple response case+-- of 'HTTP.status200' and no extra headers.+newtype ServerResStream framing (ts::[*]) m as+ = ServerResponseStream+ { unServerResponseStream :: m as+ } deriving (Functor, Applicative, Monad)+instance MonadTrans (ServerResStream framing ts) where+ lift = ServerResponseStream+type ServerResponseStream framing ts m = ServerResStream framing ts+ (R.ReaderT Wai.Request+ (W.WriterT HTTP.ResponseHeaders+ (W.WriterT HTTP.Status+ (C.ContT Wai.Response m))))+-- | All supported effects are handled by nested 'Monad's.+type instance MC.CanDo (ServerResponseStream framing ts m) eff = 'False++instance HTTP_ResponseStream Server where+ type ResponseStreamConstraint Server as ts framing =+ ( FramingEncode framing as+ , MimeTypes ts (MimeEncodable (FramingYield as))+ )+ type ResponseStreamArgs Server as ts framing =+ ServerResponseStream framing ts IO as+ type ResponseStream Server =+ Wai.Request ->+ (Wai.Response -> IO Wai.ResponseReceived) ->+ IO Wai.ResponseReceived+ responseStream ::+ forall as ts framing repr.+ ResponseStreamConstraint repr as ts framing =>+ repr ~ Server =>+ HTTP.Method ->+ repr (ResponseStreamArgs repr as ts framing)+ (ResponseStream repr)+ responseStream expMethod = Server $ do+ st@ServerState+ { serverState_request = req+ } <- S.get+ + -- Check the path has been fully consumed+ unless (List.null $ Wai.pathInfo req) $+ MC.throw $ Fail st [ServerErrorPath "path is longer"]+ + -- Check the method+ let reqMethod = Wai.requestMethod $ serverState_request st+ unless (reqMethod == expMethod+ || reqMethod == HTTP.methodHead+ && expMethod == HTTP.methodGet) $+ MC.throw $ Fail st [ServerErrorMethod]+ + -- Check the Accept header+ let reqHeaders = Wai.requestHeaders $ serverState_request st+ MimeType reqAccept <- do+ case List.lookup HTTP.hAccept reqHeaders of+ Nothing ->+ return $ NonEmpty.head $ mimeTypes @ts @(MimeEncodable (FramingYield as))+ Just h ->+ case matchAccept @ts @(MimeEncodable (FramingYield as)) h of+ Nothing -> MC.throw $ Fail st [ServerErrorAccept (mediaTypes @ts @(MimeEncodable (FramingYield as))) (Just (Left h))]+ Just mt -> return mt+ + return $ \(ServerResponseStream k) rq re -> re =<< do+ C.runContT (W.runWriterT $ W.runWriterT $ R.runReaderT k rq) $ \((as,hs),sta) ->+ return{-IO-} $+ Wai.responseStream sta+ ( (HTTP.hContentType, Media.renderHeader $ mediaTypeFor reqAccept)+ : hs+ ) $ \write flush ->+ if reqMethod == HTTP.methodHead+ then flush+ else+ let enc = framingEncode (Proxy @framing) (mimeEncode reqAccept) in+ let go curr =+ case curr of+ Left _end -> flush+ Right (bsl, next) -> do+ unless (BSL.null bsl) $ do+ write (BSB.lazyByteString bsl)+ flush+ enc next >>= go+ in enc as >>= go++-- | Return worse 'HTTP.Status'.+instance Semigroup HTTP.Status where+ x <> y =+ if rank (HTTP.statusCode x) < rank (HTTP.statusCode y)+ then x+ else y+ where+ rank :: Int -> Int+ rank 404 = 0 -- Not Found+ rank 405 = 1 -- Method Not Allowed+ rank 401 = 2 -- Unauthorized+ rank 415 = 3 -- Unsupported Media Type+ rank 406 = 4 -- Not Acceptable+ rank 400 = 5 -- Bad Request+ rank _ = 6+-- | Useful when 'HTTP.Status' is within a 'W.WriterT'.+instance Monoid HTTP.Status where+ mempty = HTTP.status200+ mappend = (<>)
+ stack.yaml view
@@ -0,0 +1,10 @@+resolver: lts-12.26+packages:+- '.'+- location: '../symantic-http'+ extra-dep: true+extra-deps:+- http-api-data-0.4@sha256:ad69f7cd0d1e7723abfbed6f88ac987bdf75a402b29de161eb867c6131c9d427+- monad-classes-0.3.2.2@sha256:793faead28dafb47f115c4dec877ce3e3ffab604f134d852652385632ea0923f+nix:+ packages: [zlib]
+ symantic-http-server.cabal view
@@ -0,0 +1,81 @@+name: symantic-http-server+-- PVP: +-+------- breaking API changes+-- | | +----- non-breaking API additions+-- | | | +--- code changes with no API change+version: 0.0.0.20190324+category: Protocol+synopsis: symantic-http applied to the derivation of HTTP servers+description: + This library applies <https://hackage.haskell.org/package/symantic-http symantic-http>+ to the building of an HTTP server (request routing and decoding)+ based upon <https://hackage.haskell.org/package/warp warp>,+ .+ For learning how to use this library,+ you can read the demo example+ in <git://git.autogeree.net/symantic-http symantic-http.git>.+extra-doc-files:+license: GPL-3+license-file: COPYING+stability: experimental+author: Julien Moutinho <julm+symantic-http@autogeree.net>+maintainer: Julien Moutinho <julm+symantic-http@autogeree.net>+bug-reports: Julien Moutinho <julm+symantic-http@autogeree.net>+-- homepage:++build-type: Simple+cabal-version: 1.24+tested-with: GHC==8.4.4+extra-source-files:+ stack.yaml+extra-tmp-files:++Source-Repository head+ location: git://git.autogeree.net/symantic-http+ type: git++Library+ exposed-modules:+ Symantic.HTTP.Server+ default-language: Haskell2010+ default-extensions:+ AllowAmbiguousTypes+ DataKinds+ FlexibleContexts+ FlexibleInstances+ InstanceSigs+ LambdaCase+ MultiParamTypeClasses+ NamedFieldPuns+ NoImplicitPrelude+ RecordWildCards+ ScopedTypeVariables+ TupleSections+ TypeApplications+ TypeFamilies+ TypeOperators+ ghc-options:+ -Wall+ -Wincomplete-uni-patterns+ -Wincomplete-record-updates+ -fno-warn-tabs+ -- -fhide-source-paths+ build-depends:+ symantic-http >= 0.0+ , base >= 4.10 && < 5+ , base64-bytestring >= 1.0.0.1+ , bytestring >= 0.10+ , containers >= 0.5+ , http-api-data >= 0.4+ , http-media >= 0.7+ , http-types >= 0.12+ , monad-classes >= 0.3.2+ , network-uri >= 2.6+ , stm >= 2.4.5+ , text >= 1.2+ , time >= 1.8+ , transformers >= 0.5+ , wai >= 3.2.1.1+ , warp >= 3.2+ , word8 >= 0.1.3+ -- pkgconfig-depends: zlib+ -- extra-libraries: z