@@ -1,29 +1,29 @@
1−{-# LANGUAGE CPP #-}
1+{-# LANGUAGE AllowAmbiguousTypes #-}
2{-# LANGUAGE ConstraintKinds #-}
2{-# LANGUAGE ConstraintKinds #-}
3{-# LANGUAGE DataKinds #-}
3{-# LANGUAGE DataKinds #-}
4{-# LANGUAGE DeriveDataTypeable #-}
4{-# LANGUAGE DeriveDataTypeable #-}
5{-# LANGUAGE FlexibleContexts #-}
5{-# LANGUAGE FlexibleContexts #-}
6{-# LANGUAGE FlexibleInstances #-}
6{-# LANGUAGE FlexibleInstances #-}
7+{-# LANGUAGE InstanceSigs #-}
7{-# LANGUAGE MultiParamTypeClasses #-}
8{-# LANGUAGE MultiParamTypeClasses #-}
8{-# LANGUAGE OverloadedStrings #-}
9{-# LANGUAGE OverloadedStrings #-}
9{-# LANGUAGE PolyKinds #-}
10{-# LANGUAGE PolyKinds #-}
11+{-# LANGUAGE QuantifiedConstraints #-}
10{-# LANGUAGE RankNTypes #-}
12{-# LANGUAGE RankNTypes #-}
11{-# LANGUAGE ScopedTypeVariables #-}
13{-# LANGUAGE ScopedTypeVariables #-}
12{-# LANGUAGE TupleSections #-}
14{-# LANGUAGE TupleSections #-}
15+{-# LANGUAGE TypeApplications #-}
13{-# LANGUAGE TypeFamilies #-}
16{-# LANGUAGE TypeFamilies #-}
14{-# LANGUAGE TypeOperators #-}
17{-# LANGUAGE TypeOperators #-}
15{-# LANGUAGE UndecidableInstances #-}
18{-# LANGUAGE UndecidableInstances #-}
17−#if MIN_VERSION_base(4,9,0) && __GLASGOW_HASKELL__ >= 802
18−#define HAS_TYPE_ERROR
21module Servant.Server.Internal
20module Servant.Server.Internal
22 ( module Servant.Server.Internal
21 ( module Servant.Server.Internal
23 , module Servant.Server.Internal.BasicAuth
22 , module Servant.Server.Internal.BasicAuth
24 , module Servant.Server.Internal.Context
23 , module Servant.Server.Internal.Context
25 , module Servant.Server.Internal.Delayed
24 , module Servant.Server.Internal.Delayed
26 , module Servant.Server.Internal.DelayedIO
25 , module Servant.Server.Internal.DelayedIO
26+ , module Servant.Server.Internal.ErrorFormatter
27 , module Servant.Server.Internal.Handler
27 , module Servant.Server.Internal.Handler
28 , module Servant.Server.Internal.Router
28 , module Servant.Server.Internal.Router
29 , module Servant.Server.Internal.RouteResult
29 , module Servant.Server.Internal.RouteResult
@@ -41,12 +41,11 @@ import qualified Data.ByteString as B
41import qualified Data.ByteString.Builder as BB
41import qualified Data.ByteString.Builder as BB
42import qualified Data.ByteString.Char8 as BC8
42import qualified Data.ByteString.Char8 as BC8
43import qualified Data.ByteString.Lazy as BL
43import qualified Data.ByteString.Lazy as BL
44+import Data.Constraint (Constraint, Dict(..))
44import Data.Either
45import Data.Either
45 (partitionEithers)
46 (partitionEithers)
46import Data.Maybe
47import Data.Maybe
47 (fromMaybe, isNothing, mapMaybe, maybeToList)
48 (fromMaybe, isNothing, mapMaybe, maybeToList)
50import Data.String
49import Data.String
51 (IsString (..))
50 (IsString (..))
52import Data.String.Conversions
51import Data.String.Conversions
@@ -55,8 +54,9 @@ import Data.Tagged
55 (Tagged (..), retag, untag)
54 (Tagged (..), retag, untag)
56import qualified Data.Text as T
55import qualified Data.Text as T
57import Data.Typeable
56import Data.Typeable
58import GHC.TypeLits
58import GHC.TypeLits
59− (KnownNat, KnownSymbol, natVal, symbolVal)
59+ (KnownNat, KnownSymbol, TypeError, symbolVal)
60import qualified Network.HTTP.Media as NHM
60import qualified Network.HTTP.Media as NHM
61import Network.HTTP.Types hiding
61import Network.HTTP.Types hiding
62 (Header, ResponseHeaders)
62 (Header, ResponseHeaders)
@@ -64,47 +64,52 @@ import Network.Socket
64 (SockAddr)
64 (SockAddr)
65import Network.Wai
65import Network.Wai
66 (Application, Request, httpVersion, isSecure, lazyRequestBody,
66 (Application, Request, httpVersion, isSecure, lazyRequestBody,
67− queryString, remoteHost, requestBody, requestHeaders,
67+ queryString, remoteHost, getRequestBodyChunk, requestHeaders,
68 requestMethod, responseLBS, responseStream, vault)
68 requestMethod, responseLBS, responseStream, vault)
69import Prelude ()
69import Prelude ()
70import Prelude.Compat
70import Prelude.Compat
71import Servant.API
71import Servant.API
72 ((:<|>) (..), (:>), Accept (..), BasicAuth, Capture',
72 ((:<|>) (..), (:>), Accept (..), BasicAuth, Capture',
73− CaptureAll, Description, EmptyAPI, FramingRender (..),
73+ CaptureAll, Description, EmptyAPI, Fragment,
74− FramingUnrender (..), FromSourceIO (..), Header', If,
74+ FramingRender (..), FramingUnrender (..), FromSourceIO (..),
75− IsSecure (..), QueryFlag, QueryParam', QueryParams, Raw,
75+ Header', If, IsSecure (..), NoContentVerb, QueryFlag,
76− ReflectMethod (reflectMethod), RemoteHost, ReqBody',
76+ QueryParam', QueryParams, Raw, ReflectMethod (reflectMethod),
77− SBool (..), SBoolI (..), SourceIO, Stream, StreamBody',
77+ RemoteHost, ReqBody', SBool (..), SBoolI (..), SourceIO,
78− Summary, ToSourceIO (..), Vault, Verb, NoContentVerb,
78+ Stream, StreamBody', Summary, ToSourceIO (..), Vault, Verb,
79− WithNamedContext)
79+ WithNamedContext, NamedRoutes)
80+import Servant.API.Generic (GenericMode(..), ToServant, ToServantApi, GServantProduct, toServant, fromServant)
80import Servant.API.ContentTypes
81import Servant.API.ContentTypes
81 (AcceptHeader (..), AllCTRender (..), AllCTUnrender (..),
82 (AcceptHeader (..), AllCTRender (..), AllCTUnrender (..),
82− AllMime, MimeRender (..), MimeUnrender (..), canHandleAcceptH,
83+ AllMime, MimeRender (..), MimeUnrender (..), NoContent,
83− NoContent)
84+ canHandleAcceptH)
84import Servant.API.Modifiers
85import Servant.API.Modifiers
85 (FoldLenient, FoldRequired, RequestArgument,
86 (FoldLenient, FoldRequired, RequestArgument,
86 unfoldRequestArgument)
87 unfoldRequestArgument)
87import Servant.API.ResponseHeaders
88import Servant.API.ResponseHeaders
88 (GetHeaders, Headers, getHeaders, getResponse)
89 (GetHeaders, Headers, getHeaders, getResponse)
90+import Servant.API.Status
89import qualified Servant.Types.SourceT as S
92import qualified Servant.Types.SourceT as S
93+import Servant.API.TypeErrors
90import Web.HttpApiData
94import Web.HttpApiData
91− (FromHttpApiData, parseHeader, parseQueryParam,
95+ (FromHttpApiData, parseHeader, parseQueryParam, parseUrlPiece,
92− parseUrlPieces, parseUrlPiece)
96+ parseUrlPieces)
94import Servant.Server.Internal.BasicAuth
98import Servant.Server.Internal.BasicAuth
95import Servant.Server.Internal.Context
99import Servant.Server.Internal.Context
96import Servant.Server.Internal.Delayed
100import Servant.Server.Internal.Delayed
97import Servant.Server.Internal.DelayedIO
101import Servant.Server.Internal.DelayedIO
102+import Servant.Server.Internal.ErrorFormatter
98import Servant.Server.Internal.Handler
103import Servant.Server.Internal.Handler
99import Servant.Server.Internal.Router
104import Servant.Server.Internal.Router
100import Servant.Server.Internal.RouteResult
105import Servant.Server.Internal.RouteResult
101import Servant.Server.Internal.RoutingApplication
106import Servant.Server.Internal.RoutingApplication
102import Servant.Server.Internal.ServerError
107import Servant.Server.Internal.ServerError
104−#ifdef HAS_TYPE_ERROR
105import GHC.TypeLits
109import GHC.TypeLits
106 (ErrorMessage (..), TypeError)
110 (ErrorMessage (..), TypeError)
107−#endif
111+import Servant.API.TypeLevel
112+ (AtLeastOneFragment, FragmentUnique)
109class HasServer api context where
114class HasServer api context where
110 type ServerT api (m :: * -> *) :: *
115 type ServerT api (m :: * -> *) :: *
@@ -168,7 +173,10 @@ instance (HasServer a context, HasServer b context) => HasServer (a :<|> b) cont
168-- > server = getBook
173-- > server = getBook
169-- > where getBook :: Text -> Handler Book
174-- > where getBook :: Text -> Handler Book
170-- > getBook isbn = ...
175-- > getBook isbn = ...
176+instance (KnownSymbol capture, FromHttpApiData a, Typeable a
171−instance (KnownSymbol capture, FromHttpApiData a, HasServer api context, SBoolI (FoldLenient mods))
177+ , HasServer api context, SBoolI (FoldLenient mods)
178+ , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
172 => HasServer (Capture' mods capture a :> api) context where
180 => HasServer (Capture' mods capture a :> api) context where
174 type ServerT (Capture' mods capture a :> api) m =
182 type ServerT (Capture' mods capture a :> api) m =
@@ -177,15 +185,19 @@ instance (KnownSymbol capture, FromHttpApiData a, HasServer api context, SBoolI
177 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
185 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
179 route Proxy context d =
187 route Proxy context d =
180− CaptureRouter $
188+ CaptureRouter [hint] $
181 route (Proxy :: Proxy api)
189 route (Proxy :: Proxy api)
191+ (addCapture d $ \ txt -> withRequest $ \ request ->
183− (addCapture d $ \ txt -> case ( sbool :: SBool (FoldLenient mods)
192+ case ( sbool :: SBool (FoldLenient mods)
184− , parseUrlPiece txt :: Either T.Text a) of
193+ , parseUrlPiece txt :: Either T.Text a) of
185− (SFalse, Left e) -> delayedFail err400 { errBody = cs e }
194+ (SFalse, Left e) -> delayedFail $ formatError rep request $ cs e
186− (SFalse, Right v) -> return v
195+ (SFalse, Right v) -> return v
187− (STrue, piece) -> return $ (either (Left . cs) Right) piece
196+ (STrue, piece) -> return $ (either (Left . cs) Right) piece)
198+ rep = typeRep (Proxy :: Proxy Capture')
199+ formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
200+ hint = CaptureHint (T.pack $ symbolVal $ Proxy @capture) (typeRep (Proxy :: Proxy a))
190-- | If you use 'CaptureAll' in one of the endpoints for your API,
202-- | If you use 'CaptureAll' in one of the endpoints for your API,
191-- this automatically requires your server-side handler to be a
203-- this automatically requires your server-side handler to be a
@@ -204,7 +216,10 @@ instance (KnownSymbol capture, FromHttpApiData a, HasServer api context, SBoolI
204-- > server = getSourceFile
216-- > server = getSourceFile
205-- > where getSourceFile :: [Text] -> Handler Book
217-- > where getSourceFile :: [Text] -> Handler Book
206-- > getSourceFile pathSegments = ...
218-- > getSourceFile pathSegments = ...
207−instance (KnownSymbol capture, FromHttpApiData a, HasServer api context)
219+instance (KnownSymbol capture, FromHttpApiData a, Typeable a
220+ , HasServer api context
221+ , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
208 => HasServer (CaptureAll capture a :> api) context where
223 => HasServer (CaptureAll capture a :> api) context where
210 type ServerT (CaptureAll capture a :> api) m =
225 type ServerT (CaptureAll capture a :> api) m =
@@ -213,14 +228,18 @@ instance (KnownSymbol capture, FromHttpApiData a, HasServer api context)
213 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
228 hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
215 route Proxy context d =
230 route Proxy context d =
216− CaptureAllRouter $
231+ CaptureAllRouter [hint] $
217 route (Proxy :: Proxy api)
232 route (Proxy :: Proxy api)
234+ (addCapture d $ \ txts -> withRequest $ \ request ->
219− (addCapture d $ \ txts -> case parseUrlPieces txts of
235+ case parseUrlPieces txts of
220− Left _ -> delayedFail err400
236+ Left e -> delayedFail $ formatError rep request $ cs e
221− Right v -> return v
237+ Right v -> return v
240+ rep = typeRep (Proxy :: Proxy CaptureAll)
241+ formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
242+ hint = CaptureHint (T.pack $ symbolVal $ Proxy @capture) (typeRep (Proxy :: Proxy [a]))
225allowedMethodHead :: Method -> Request -> Bool
244allowedMethodHead :: Method -> Request -> Bool
226allowedMethodHead method request = method == methodGet && requestMethod request == methodHead
245allowedMethodHead method request = method == methodGet && requestMethod request == methodHead
@@ -240,10 +259,10 @@ methodCheck method request
240-- body check is no longer an option. However, we now run the accept
259-- body check is no longer an option. However, we now run the accept
241-- check before the body check and can therefore afford to make it
260-- check before the body check and can therefore afford to make it
242-- recoverable.
261-- recoverable.
243−acceptCheck :: (AllMime list) => Proxy list -> B.ByteString -> DelayedIO ()
262+acceptCheck :: (AllMime list) => Proxy list -> AcceptHeader -> DelayedIO ()
244acceptCheck proxy accH
263acceptCheck proxy accH
245− | canHandleAcceptH proxy (AcceptHeader accH) = return ()
264+ | canHandleAcceptH proxy accH = return ()
246− | otherwise = delayedFail err406
265+ | otherwise = delayedFail err406
248methodRouter :: (AllCTRender ctypes a)
267methodRouter :: (AllCTRender ctypes a)
249 => (b -> ([(HeaderName, B.ByteString)], a))
268 => (b -> ([(HeaderName, B.ByteString)], a))
@@ -253,12 +272,12 @@ methodRouter :: (AllCTRender ctypes a)
253methodRouter splitHeaders method proxy status action = leafRouter route'
272methodRouter splitHeaders method proxy status action = leafRouter route'
255 route' env request respond =
274 route' env request respond =
256− let accH = fromMaybe ct_wildcard $ lookup hAccept $ requestHeaders request
275+ let accH = getAcceptHeader request
257 in runAction (action `addMethodCheck` methodCheck method request
276 in runAction (action `addMethodCheck` methodCheck method request
258 `addAcceptCheck` acceptCheck proxy accH
277 `addAcceptCheck` acceptCheck proxy accH
259 ) env request respond $ \ output -> do
278 ) env request respond $ \ output -> do
260 let (headers, b) = splitHeaders output
279 let (headers, b) = splitHeaders output
261− case handleAcceptH proxy (AcceptHeader accH) b of
280+ case handleAcceptH proxy accH b of
262 Nothing -> FailFatal err406 -- this should not happen (checked before), so we make it fatal if it does
281 Nothing -> FailFatal err406 -- this should not happen (checked before), so we make it fatal if it does
263 Just (contentT, body) ->
282 Just (contentT, body) ->
264 let bdy = if allowedMethodHead method request then "" else body
283 let bdy = if allowedMethodHead method request then "" else body
@@ -284,7 +303,7 @@ instance {-# OVERLAPPABLE #-}
285 route Proxy _ = methodRouter ([],) method (Proxy :: Proxy ctypes) status
304 route Proxy _ = methodRouter ([],) method (Proxy :: Proxy ctypes) status
286 where method = reflectMethod (Proxy :: Proxy method)
305 where method = reflectMethod (Proxy :: Proxy method)
287− status = toEnum . fromInteger $ natVal (Proxy :: Proxy status)
306+ status = statusFromNat (Proxy :: Proxy status)
289instance {-# OVERLAPPING #-}
308instance {-# OVERLAPPING #-}
290 ( AllCTRender ctypes a, ReflectMethod method, KnownNat status
309 ( AllCTRender ctypes a, ReflectMethod method, KnownNat status
@@ -296,7 +315,7 @@ instance {-# OVERLAPPING #-}
297 route Proxy _ = methodRouter (\x -> (getHeaders x, getResponse x)) method (Proxy :: Proxy ctypes) status
316 route Proxy _ = methodRouter (\x -> (getHeaders x, getResponse x)) method (Proxy :: Proxy ctypes) status
298 where method = reflectMethod (Proxy :: Proxy method)
317 where method = reflectMethod (Proxy :: Proxy method)
299− status = toEnum . fromInteger $ natVal (Proxy :: Proxy status)
318+ status = statusFromNat (Proxy :: Proxy status)
301instance (ReflectMethod method) =>
320instance (ReflectMethod method) =>
302 HasServer (NoContentVerb method) context where
321 HasServer (NoContentVerb method) context where
@@ -317,7 +336,7 @@ instance {-# OVERLAPPABLE #-}
318 route Proxy _ = streamRouter ([],) method status (Proxy :: Proxy framing) (Proxy :: Proxy ctype)
337 route Proxy _ = streamRouter ([],) method status (Proxy :: Proxy framing) (Proxy :: Proxy ctype)
319 where method = reflectMethod (Proxy :: Proxy method)
338 where method = reflectMethod (Proxy :: Proxy method)
320− status = toEnum . fromInteger $ natVal (Proxy :: Proxy status)
339+ status = statusFromNat (Proxy :: Proxy status)
323instance {-# OVERLAPPING #-}
342instance {-# OVERLAPPING #-}
@@ -331,7 +350,7 @@ instance {-# OVERLAPPING #-}
332 route Proxy _ = streamRouter (\x -> (getHeaders x, getResponse x)) method status (Proxy :: Proxy framing) (Proxy :: Proxy ctype)
351 route Proxy _ = streamRouter (\x -> (getHeaders x, getResponse x)) method status (Proxy :: Proxy framing) (Proxy :: Proxy ctype)
333 where method = reflectMethod (Proxy :: Proxy method)
352 where method = reflectMethod (Proxy :: Proxy method)
334− status = toEnum . fromInteger $ natVal (Proxy :: Proxy status)
353+ status = statusFromNat (Proxy :: Proxy status)
337streamRouter :: forall ctype a c chunk env framing. (MimeRender ctype chunk, FramingRender framing, ToSourceIO chunk a) =>
356streamRouter :: forall ctype a c chunk env framing. (MimeRender ctype chunk, FramingRender framing, ToSourceIO chunk a) =>
@@ -343,7 +362,7 @@ streamRouter :: forall ctype a c chunk env framing. (MimeRender ctype chunk, Fra
343 -> Delayed env (Handler c)
362 -> Delayed env (Handler c)
344 -> Router env
363 -> Router env
345streamRouter splitHeaders method status framingproxy ctypeproxy action = leafRouter $ \env request respond ->
364streamRouter splitHeaders method status framingproxy ctypeproxy action = leafRouter $ \env request respond ->
346− let accH = fromMaybe ct_wildcard $ lookup hAccept $ requestHeaders request
365+ let AcceptHeader accH = getAcceptHeader request
347 cmediatype = NHM.matchAccept [contentType ctypeproxy] accH
366 cmediatype = NHM.matchAccept [contentType ctypeproxy] accH
348 accCheck = when (isNothing cmediatype) $ delayedFail err406
367 accCheck = when (isNothing cmediatype) $ delayedFail err406
349 contentHeader = (hContentType, NHM.renderHeader . maybeToList $ cmediatype)
368 contentHeader = (hContentType, NHM.renderHeader . maybeToList $ cmediatype)
@@ -388,6 +407,7 @@ streamRouter splitHeaders method status framingproxy ctypeproxy action = leafRou
389 (KnownSymbol sym, FromHttpApiData a, HasServer api context
408 (KnownSymbol sym, FromHttpApiData a, HasServer api context
390 , SBoolI (FoldRequired mods), SBoolI (FoldLenient mods)
409 , SBoolI (FoldRequired mods), SBoolI (FoldLenient mods)
410+ , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
392 => HasServer (Header' mods sym a :> api) context where
412 => HasServer (Header' mods sym a :> api) context where
@@ -399,6 +419,9 @@ instance
399 route Proxy context subserver = route (Proxy :: Proxy api) context $
419 route Proxy context subserver = route (Proxy :: Proxy api) context $
400 subserver `addHeaderCheck` withRequest headerCheck
420 subserver `addHeaderCheck` withRequest headerCheck
422+ rep = typeRep (Proxy :: Proxy Header')
423+ formatError = headerParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
402 headerName :: IsString n => n
425 headerName :: IsString n => n
403 headerName = fromString $ symbolVal (Proxy :: Proxy sym)
426 headerName = fromString $ symbolVal (Proxy :: Proxy sym)
@@ -409,15 +432,13 @@ instance
409 mev :: Maybe (Either T.Text a)
432 mev :: Maybe (Either T.Text a)
410 mev = fmap parseHeader $ lookup headerName (requestHeaders req)
433 mev = fmap parseHeader $ lookup headerName (requestHeaders req)
412− errReq = delayedFailFatal err400
435+ errReq = delayedFailFatal $ formatError rep req
413− { errBody = "Header " <> headerName <> " is required"
436+ $ "Header " <> headerName <> " is required"
416− errSt e = delayedFailFatal err400
438+ errSt e = delayedFailFatal $ formatError rep req
417− { errBody = cs $ "Error parsing header "
439+ $ cs $ "Error parsing header "
418− <> headerName
440+ <> headerName
419− <> " failed: " <> e
441+ <> " failed: " <> e
422-- | If you use @'QueryParam' "author" Text@ in one of the endpoints for your API,
443-- | If you use @'QueryParam' "author" Text@ in one of the endpoints for your API,
423-- this automatically requires your server-side handler to be a function
444-- this automatically requires your server-side handler to be a function
@@ -443,6 +464,7 @@ instance
444 ( KnownSymbol sym, FromHttpApiData a, HasServer api context
465 ( KnownSymbol sym, FromHttpApiData a, HasServer api context
445 , SBoolI (FoldRequired mods), SBoolI (FoldLenient mods)
466 , SBoolI (FoldRequired mods), SBoolI (FoldLenient mods)
467+ , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
447 => HasServer (QueryParam' mods sym a :> api) context where
469 => HasServer (QueryParam' mods sym a :> api) context where
@@ -455,6 +477,9 @@ instance
455 let querytext = queryToQueryText . queryString
477 let querytext = queryToQueryText . queryString
456 paramname = cs $ symbolVal (Proxy :: Proxy sym)
478 paramname = cs $ symbolVal (Proxy :: Proxy sym)
480+ rep = typeRep (Proxy :: Proxy QueryParam')
481+ formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
458 parseParam :: Request -> DelayedIO (RequestArgument mods a)
483 parseParam :: Request -> DelayedIO (RequestArgument mods a)
459 parseParam req =
484 parseParam req =
460 unfoldRequestArgument (Proxy :: Proxy mods) errReq errSt mev
485 unfoldRequestArgument (Proxy :: Proxy mods) errReq errSt mev
@@ -462,14 +487,12 @@ instance
462 mev :: Maybe (Either T.Text a)
487 mev :: Maybe (Either T.Text a)
463 mev = fmap parseQueryParam $ join $ lookup paramname $ querytext req
488 mev = fmap parseQueryParam $ join $ lookup paramname $ querytext req
465− errReq = delayedFailFatal err400
490+ errReq = delayedFailFatal $ formatError rep req
466− { errBody = cs $ "Query parameter " <> paramname <> " is required"
491+ $ cs $ "Query parameter " <> paramname <> " is required"
469− errSt e = delayedFailFatal err400
493+ errSt e = delayedFailFatal $ formatError rep req
470− { errBody = cs $ "Error parsing query parameter "
494+ $ cs $ "Error parsing query parameter "
471− <> paramname <> " failed: " <> e
495+ <> paramname <> " failed: " <> e
474 delayed = addParameterCheck subserver . withRequest $ \req ->
497 delayed = addParameterCheck subserver . withRequest $ \req ->
475 parseParam req
498 parseParam req
@@ -495,7 +518,8 @@ instance
495-- > server = getBooksBy
518-- > server = getBooksBy
496-- > where getBooksBy :: [Text] -> Handler [Book]
519-- > where getBooksBy :: [Text] -> Handler [Book]
497-- > getBooksBy authors = ...return all books by these authors...
520-- > getBooksBy authors = ...return all books by these authors...
498−instance (KnownSymbol sym, FromHttpApiData a, HasServer api context)
521+instance (KnownSymbol sym, FromHttpApiData a, HasServer api context
522+ , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters)
499 => HasServer (QueryParams sym a :> api) context where
523 => HasServer (QueryParams sym a :> api) context where
501 type ServerT (QueryParams sym a :> api) m =
525 type ServerT (QueryParams sym a :> api) m =
@@ -506,21 +530,23 @@ instance (KnownSymbol sym, FromHttpApiData a, HasServer api context)
506 route Proxy context subserver = route (Proxy :: Proxy api) context $
530 route Proxy context subserver = route (Proxy :: Proxy api) context $
507 subserver `addParameterCheck` withRequest paramsCheck
531 subserver `addParameterCheck` withRequest paramsCheck
533+ rep = typeRep (Proxy :: Proxy QueryParams)
534+ formatError = urlParseErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
509 paramname = cs $ symbolVal (Proxy :: Proxy sym)
536 paramname = cs $ symbolVal (Proxy :: Proxy sym)
510 paramsCheck req =
537 paramsCheck req =
511 case partitionEithers $ fmap parseQueryParam params of
538 case partitionEithers $ fmap parseQueryParam params of
512 ([], parsed) -> return parsed
539 ([], parsed) -> return parsed
513− (errs, _) -> delayedFailFatal err400
540+ (errs, _) -> delayedFailFatal $ formatError rep req
514− { errBody = cs $ "Error parsing query parameter(s) "
541+ $ cs $ "Error parsing query parameter(s) "
515− <> paramname <> " failed: "
542+ <> paramname <> " failed: "
516− <> T.intercalate ", " errs
543+ <> T.intercalate ", " errs
519 params :: [T.Text]
545 params :: [T.Text]
520 params = mapMaybe snd
546 params = mapMaybe snd
521 . filter (looksLikeParam . fst)
547 . filter (looksLikeParam . fst)
522− . queryToQueryText
548+ . queryToQueryText
523− . queryString
549+ . queryString
526 looksLikeParam name = name == paramname || name == (paramname <> "[]")
552 looksLikeParam name = name == paramname || name == (paramname <> "[]")
@@ -588,7 +614,7 @@ instance HasServer Raw context where
588-- The @Content-Type@ header is inspected, and the list provided is used to
614-- The @Content-Type@ header is inspected, and the list provided is used to
589-- attempt deserialization. If the request does not have a @Content-Type@
615-- attempt deserialization. If the request does not have a @Content-Type@
590-- header, it is treated as @application/octet-stream@ (as specified in
616-- header, it is treated as @application/octet-stream@ (as specified in
591−-- <http://tools.ietf.org/html/rfc7231#section-3.1.1.5 RFC7231>.
617+-- [RFC 7231 section 3.1.1.5](http://tools.ietf.org/html/rfc7231#section-3.1.1.5)).
592-- This lets servant worry about extracting it from the request and turning
618-- This lets servant worry about extracting it from the request and turning
593-- it into a value of the type you specify.
619-- it into a value of the type you specify.
@@ -604,6 +630,7 @@ instance HasServer Raw context where
604-- > where postBook :: Book -> Handler Book
630-- > where postBook :: Book -> Handler Book
605-- > postBook book = ...insert into your db...
631-- > postBook book = ...insert into your db...
606instance ( AllCTUnrender list a, HasServer api context, SBoolI (FoldLenient mods)
632instance ( AllCTUnrender list a, HasServer api context, SBoolI (FoldLenient mods)
633+ , HasContextEntry (MkContextWithErrorFormatter context) ErrorFormatters
607 ) => HasServer (ReqBody' mods list a :> api) context where
634 ) => HasServer (ReqBody' mods list a :> api) context where
609 type ServerT (ReqBody' mods list a :> api) m =
636 type ServerT (ReqBody' mods list a :> api) m =
@@ -615,6 +642,9 @@ instance ( AllCTUnrender list a, HasServer api context, SBoolI (FoldLenient mods
615 = route (Proxy :: Proxy api) context $
642 = route (Proxy :: Proxy api) context $
616 addBodyCheck subserver ctCheck bodyCheck
643 addBodyCheck subserver ctCheck bodyCheck
645+ rep = typeRep (Proxy :: Proxy ReqBody')
646+ formatError = bodyParserErrorFormatter $ getContextEntry (mkContextWithErrorFormatter context)
618 -- Content-Type check, we only lookup we can try to parse the request body
648 -- Content-Type check, we only lookup we can try to parse the request body
619 ctCheck = withRequest $ \ request -> do
649 ctCheck = withRequest $ \ request -> do
620 -- See HTTP RFC 2616, section 7.2.1
650 -- See HTTP RFC 2616, section 7.2.1
@@ -633,7 +663,7 @@ instance ( AllCTUnrender list a, HasServer api context, SBoolI (FoldLenient mods
633 case sbool :: SBool (FoldLenient mods) of
663 case sbool :: SBool (FoldLenient mods) of
634 STrue -> return mrqbody
664 STrue -> return mrqbody
635 SFalse -> case mrqbody of
665 SFalse -> case mrqbody of
636− Left e -> delayedFailFatal err400 { errBody = cs e }
666+ Left e -> delayedFailFatal $ formatError rep request e
637 Right v -> return v
667 Right v -> return v
@@ -656,7 +686,7 @@ instance
656 bodyCheck fromRS = withRequest $ \req -> do
686 bodyCheck fromRS = withRequest $ \req -> do
657 let mimeUnrender' = mimeUnrender (Proxy :: Proxy ctype) :: BL.ByteString -> Either String chunk
687 let mimeUnrender' = mimeUnrender (Proxy :: Proxy ctype) :: BL.ByteString -> Either String chunk
658 let framingUnrender' = framingUnrender (Proxy :: Proxy framing) mimeUnrender' :: SourceIO B.ByteString -> SourceIO chunk
688 let framingUnrender' = framingUnrender (Proxy :: Proxy framing) mimeUnrender' :: SourceIO B.ByteString -> SourceIO chunk
659− let body = requestBody req
689+ let body = getRequestBodyChunk req
660 let rs = S.fromAction B.null body
690 let rs = S.fromAction B.null body
661 let rs' = fromRS $ framingUnrender' rs
691 let rs' = fromRS $ framingUnrender' rs
662 return rs'
692 return rs'
@@ -725,12 +755,12 @@ data EmptyServer = EmptyServer deriving (Typeable, Eq, Show, Bounded, Enum)
725emptyServer :: ServerT EmptyAPI m
755emptyServer :: ServerT EmptyAPI m
726emptyServer = Tagged EmptyServer
756emptyServer = Tagged EmptyServer
728−-- | The server for an `EmptyAPI` is `emptyAPIServer`.
758+-- | The server for an `EmptyAPI` is `emptyServer`.
730-- > type MyApi = "nothing" :> EmptyApi
760-- > type MyApi = "nothing" :> EmptyApi
732-- > server :: Server MyApi
762-- > server :: Server MyApi
733−-- > server = emptyAPIServer
763+-- > server = emptyServer
734instance HasServer EmptyAPI context where
764instance HasServer EmptyAPI context where
735 type ServerT EmptyAPI m = Tagged m EmptyServer
765 type ServerT EmptyAPI m = Tagged m EmptyServer
@@ -759,7 +789,10 @@ instance ( KnownSymbol realm
759-- * helpers
789-- * helpers
761ct_wildcard :: B.ByteString
791ct_wildcard :: B.ByteString
762−ct_wildcard = "*" <> "/" <> "*" -- Because CPP
792+ct_wildcard = "*" <> "/" <> "*"
794+getAcceptHeader :: Request -> AcceptHeader
795+getAcceptHeader = AcceptHeader . fromMaybe ct_wildcard . lookup hAccept . requestHeaders
764-- * General Authentication
797-- * General Authentication
@@ -784,39 +817,15 @@ instance (HasContextEntry context (NamedContext name subContext), HasServer subA
784 hoistServerWithContext _ _ nt s = hoistServerWithContext (Proxy :: Proxy subApi) (Proxy :: Proxy subContext) nt s
817 hoistServerWithContext _ _ nt s = hoistServerWithContext (Proxy :: Proxy subApi) (Proxy :: Proxy subContext) nt s
786-------------------------------------------------------------------------------
819-------------------------------------------------------------------------------
787−-- TypeError helpers
820+-- Custom type errors
788-------------------------------------------------------------------------------
821-------------------------------------------------------------------------------
790−#ifdef HAS_TYPE_ERROR
823+-- Erroring instance for 'HasServer' when a combinator is not fully applied
791−-- | This instance catches mistakes when there are non-saturated
792−-- type applications on LHS of ':>'.
794−-- >>> serve (Proxy :: Proxy (Capture "foo" :> Get '[JSON] Int)) (error "...")
796−-- ...Expected something of kind Symbol or *, got: k -> l on the LHS of ':>'.
797−-- ...Maybe you haven't applied enough arguments to
798−-- ...Capture' '[] "foo"
801−-- >>> undefined :: Server (Capture "foo" :> Get '[JSON] Int)
803−-- ...Expected something of kind Symbol or *, got: k -> l on the LHS of ':>'.
804−-- ...Maybe you haven't applied enough arguments to
805−-- ...Capture' '[] "foo"
808−instance TypeError (HasServerArrowKindError arr) => HasServer ((arr :: k -> l) :> api) context
824+instance TypeError (PartialApplication HasServer arr) => HasServer ((arr :: a -> b) :> sub) context
810− type ServerT (arr :> api) m = TypeError (HasServerArrowKindError arr)
826+ type ServerT (arr :> sub) _ = TypeError (PartialApplication (HasServer :: * -> [*] -> Constraint) arr)
811− -- it doens't really matter what sub route we peak
827+ route = error "unreachable"
812− route _ _ _ = error "servant-server panic: impossible happened in HasServer (arr :> api)"
813− hoistServerWithContext _ _ _ = id
828+ hoistServerWithContext _ _ _ _ = error "unreachable"
815−-- Cannot have TypeError here, otherwise use of this symbol will error :)
816−type HasServerArrowKindError arr =
817− 'Text "Expected something of kind Symbol or *, got: k -> l on the LHS of ':>'."
818− ':$$: 'Text "Maybe you haven't applied enough arguments to"
821-- | This instance prevents from accidentally using '->' instead of ':>'
830-- | This instance prevents from accidentally using '->' instead of ':>'
@@ -850,7 +859,103 @@ type HasServerArrowTypeError a b =
850 ':$$: 'ShowType a
859 ':$$: 'ShowType a
851 ':$$: 'Text "and"
860 ':$$: 'Text "and"
852 ':$$: 'ShowType b
861 ':$$: 'ShowType b
863+-- Erroring instances for 'HasServer' for unknown API combinators
865+-- XXX: This omits the @context@ parameter, e.g.:
867+-- "There is no instance for HasServer (Bool :> …)". Do we care ?
868+instance {-# OVERLAPPABLE #-} TypeError (NoInstanceForSub HasServer ty) => HasServer (ty :> sub) context
870+instance {-# OVERLAPPABLE #-} TypeError (NoInstanceFor (HasServer api context)) => HasServer api context
872+-- | Ignore @'Fragment'@ in server handlers.
873+-- See <https://ietf.org/rfc/rfc2616.html#section-15.1.3> for more details.
877+-- > type MyApi = "books" :> Fragment Text :> Get '[JSON] [Book]
879+-- > server :: Server MyApi
880+-- > server = getBooks
881+-- > where getBooks :: Handler [Book]
882+-- > getBooks = ...return all books...
883+instance (AtLeastOneFragment api, FragmentUnique (Fragment a1 :> api), HasServer api context)
884+ => HasServer (Fragment a1 :> api) context where
885+ type ServerT (Fragment a1 :> api) m = ServerT api m
887+ route _ = route (Proxy :: Proxy api)
889+ hoistServerWithContext _ = hoistServerWithContext (Proxy :: Proxy api)
856-- >>> import Servant
892-- >>> import Servant
894+-- | A type that specifies that an API record contains a server implementation.
895+data AsServerT (m :: * -> *)
896+instance GenericMode (AsServerT m) where
897+ type AsServerT m :- api = ServerT api m
899+type AsServer = AsServerT Handler
902+-- | Set of constraints required to convert to / from vanilla server types.
903+type GServerConstraints api m =
904+ ( ToServant api (AsServerT m) ~ ServerT (ToServantApi api) m
905+ , GServantProduct (Rep (api (AsServerT m)))
908+-- | This class is a necessary evil: in the implementation of 'HasServer' for
909+-- @'NamedRoutes' api@, we essentially need the quantified constraint @forall
910+-- m. 'GServerConstraints' m@ to hold.
912+-- We cannot require do that directly as the definition of 'GServerConstraints'
913+-- contains type family applications ('Rep' and 'ServerT'). The trick is to hide
914+-- those type family applications behind a typeclass providing evidence for
915+-- @'GServerConstraints' api m@ in the form of a dictionary, and require that
916+-- @forall m. 'GServer' api m@ instead.
918+-- Users shouldn't have to worry about this class, as the only possible instance
919+-- is provided in this module for all record APIs.
921+class GServer (api :: * -> *) (m :: * -> *) where
922+ gServerProof :: Dict (GServerConstraints api m)
925+ ( ToServant api (AsServerT m) ~ ServerT (ToServantApi api) m
926+ , GServantProduct (Rep (api (AsServerT m)))
927+ ) => GServer api m where
931+ ( HasServer (ToServantApi api) context
932+ , forall m. Generic (api (AsServerT m))
933+ , forall m. GServer api m
934+ ) => HasServer (NamedRoutes api) context where
936+ type ServerT (NamedRoutes api) m = api (AsServerT m)
939+ :: Proxy (NamedRoutes api)
941+ -> Delayed env (api (AsServerT Handler))
943+ route _ ctx delayed =
944+ case gServerProof @api @Handler of
945+ Dict -> route (Proxy @(ToServantApi api)) ctx (toServant <$> delayed)
947+ hoistServerWithContext
948+ :: forall m n. Proxy (NamedRoutes api)
950+ -> (forall x. m x -> n x)
951+ -> api (AsServerT m)
952+ -> api (AsServerT n)
953+ hoistServerWithContext _ pctx nat server =
954+ case (gServerProof @api @m, gServerProof @api @n) of
956+ fromServant servantSrvN
958+ servantSrvM :: ServerT (ToServantApi api) m =
960+ servantSrvN :: ServerT (ToServantApi api) n =
961+ hoistServerWithContext (Proxy @(ToServantApi api)) pctx nat servantSrvM