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throw 400 on query parameter parse failure

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Philipp Balzarek 2016-12-12 15:17:06 +01:00 committed by Oleg Grenrus
parent 8c3291355b
commit 3a0cbdd0f6
5 changed files with 139 additions and 43 deletions
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46
servant-server/src/Servant/Server/Internal.hs
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@ -28,7 +28,8 @@ import Control.Monad.Trans.Resource (runResourceT)
import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as BC8
import qualified Data.ByteString.Lazy as BL
import Data.Maybe (fromMaybe, mapMaybe)
import Data.Either (partitionEithers)
import Data.Maybe (fromMaybe)
import Data.String (fromString)
import Data.String.Conversions (cs, (<>))
import Data.Typeable
@ -45,7 +46,7 @@ import Network.Wai (Application, Request, Response,
import Prelude ()
import Prelude.Compat
import Web.HttpApiData (FromHttpApiData, parseHeaderMaybe,
parseQueryParamMaybe,
parseQueryParam,
parseUrlPieceMaybe,
parseUrlPieces)
import Servant.API ((:<|>) (..), (:>), BasicAuth, Capture,
@ -311,14 +312,23 @@ instance (KnownSymbol sym, FromHttpApiData a, HasServer api context)
Maybe a -> ServerT api m
route Proxy context subserver =
let querytext r = parseQueryText $ rawQueryString r
param r =
case lookup paramname (querytext r) of
Nothing -> Nothing -- param absent from the query string
Just Nothing -> Nothing -- param present with no value -> Nothing
Just (Just v) -> parseQueryParamMaybe v -- if present, we try to convert to
-- the right type
in route (Proxy :: Proxy api) context (passToServer subserver param)
let querytext req = parseQueryText $ rawQueryString req
parseParam req =
case lookup paramname (querytext req) of
Nothing -> return Nothing -- param absent from the query string
Just Nothing -> return Nothing -- param present with no value -> Nothing
Just (Just v) ->
case parseQueryParam v of
-- TODO: This should set an error description (including
-- paramname)
Left _e -> delayedFailFatal err400 -- parsing the request
-- paramter failed
Right param -> return $ Just param
delayed = addParameterCheck subserver . withRequest $ \req ->
parseParam req
in route (Proxy :: Proxy api) context delayed
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
-- | If you use @'QueryParams' "authors" Text@ in one of the endpoints for your API,
@ -352,12 +362,20 @@ instance (KnownSymbol sym, FromHttpApiData a, HasServer api context)
-- named "foo" or "foo[]" and call parseQueryParam on the
-- corresponding values
parameters r = filter looksLikeParam (querytext r)
values r = mapMaybe (convert . snd) (parameters r)
in route (Proxy :: Proxy api) context (passToServer subserver values)
parseParam (paramName, paramTxt) =
case parseQueryParam (fromMaybe "" paramTxt) of
Left _e -> Left paramName -- On error, remember name of parameter
Right paramVal -> Right paramVal
parseParams req =
case partitionEithers $ parseParam <$> parameters req of
([], params) -> return params -- No errors
-- TODO: This should set an error description
(_errors, _) -> delayedFailFatal err400
delayed = addParameterCheck subserver . withRequest $ \req ->
parseParams req
in route (Proxy :: Proxy api) context delayed
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
looksLikeParam (name, _) = name == paramname || name == (paramname <> "[]")
convert Nothing = Nothing
convert (Just v) = parseQueryParamMaybe v
-- | If you use @'QueryFlag' "published"@ in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function

58
servant-server/src/Servant/Server/Internal/RoutingApplication.hs
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@ -139,7 +139,7 @@ toApplication ra request respond = ra request routingRespond
-- Therefore, while routing, we delay most checks so that they
-- will ultimately occur in the right order.
--
-- A 'Delayed' contains three delayed blocks of tests, and
-- A 'Delayed' contains four delayed blocks of tests, and
-- the actual handler:
--
-- 1. Delayed captures. These can actually cause 404, and
@ -148,27 +148,36 @@ toApplication ra request respond = ra request routingRespond
-- check order from the error reporting, see above). Delayed
-- captures can provide inputs to the actual handler.
--
-- 2. Method check(s). This can cause a 405. On success,
-- 2. Query parameter checks. They require parsing and can cause 400 if the
-- parsing fails. Query parameter checks provide inputs to the handler
--
-- 3. Method check(s). This can cause a 405. On success,
-- it does not provide an input for the handler. Method checks
-- are comparatively cheap.
--
-- 3. Body and accept header checks. The request body check can
-- 4. Body and accept header checks. The request body check can
-- cause both 400 and 415. This provides an input to the handler.
-- The accept header check can be performed as the final
-- computation in this block. It can cause a 406.
--
data Delayed env c where
Delayed :: { capturesD :: env -> DelayedIO captures
, paramsD :: DelayedIO params
, methodD :: DelayedIO ()
, authD :: DelayedIO auth
, bodyD :: DelayedIO body
, serverD :: captures -> auth -> body -> Request -> RouteResult c
, serverD :: captures
-> params
-> auth
-> body
-> Request
-> RouteResult c
} -> Delayed env c
instance Functor (Delayed env) where
fmap f Delayed{..} =
Delayed
{ serverD = \ c a b req -> f <$> serverD c a b req
{ serverD = \ c p a b req -> f <$> serverD c p a b req
, ..
} -- Note [Existential Record Update]
@ -200,7 +209,7 @@ runDelayedIO m req = transResourceT runRouteResultT $ runReaderT (runDelayedIO'
-- | A 'Delayed' without any stored checks.
emptyDelayed :: RouteResult a -> Delayed env a
emptyDelayed result =
Delayed (const r) r r r (\ _ _ _ _ -> result)
Delayed (const r) r r r r (\ _ _ _ _ _ -> result)
where
r = return ()
@ -225,10 +234,21 @@ addCapture :: Delayed env (a -> b)
addCapture Delayed{..} new =
Delayed
{ capturesD = \ (txt, env) -> (,) <$> capturesD env <*> new txt
, serverD = \ (x, v) a b req -> ($ v) <$> serverD x a b req
, serverD = \ (x, v) p a b req -> ($ v) <$> serverD x p a b req
, ..
} -- Note [Existential Record Update]
-- | Add a parameter check to the end of the params block
addParameterCheck :: Delayed env (a -> b)
-> DelayedIO a
-> Delayed env b
addParameterCheck Delayed {..} new =
Delayed
{ paramsD = (,) <$> paramsD <*> new
, serverD = \c (p, pNew) a b req -> ($ pNew) <$> serverD c p a b req
, ..
}
-- | Add a method check to the end of the method block.
addMethodCheck :: Delayed env a
-> DelayedIO ()
@ -246,7 +266,7 @@ addAuthCheck :: Delayed env (a -> b)
addAuthCheck Delayed{..} new =
Delayed
{ authD = (,) <$> authD <*> new
, serverD = \ c (y, v) b req -> ($ v) <$> serverD c y b req
, serverD = \ c p (y, v) b req -> ($ v) <$> serverD c p y b req
, ..
} -- Note [Existential Record Update]
@ -257,7 +277,7 @@ addBodyCheck :: Delayed env (a -> b)
addBodyCheck Delayed{..} new =
Delayed
{ bodyD = (,) <$> bodyD <*> new
, serverD = \ c a (z, v) req -> ($ v) <$> serverD c a z req
, serverD = \ c p a (z, v) req -> ($ v) <$> serverD c p a z req
, ..
} -- Note [Existential Record Update]
@ -287,7 +307,7 @@ addAcceptCheck Delayed{..} new =
passToServer :: Delayed env (a -> b) -> (Request -> a) -> Delayed env b
passToServer Delayed{..} x =
Delayed
{ serverD = \ c a b req -> ($ x req) <$> serverD c a b req
{ serverD = \ c p a b req -> ($ x req) <$> serverD c p a b req
, ..
} -- Note [Existential Record Update]
@ -301,16 +321,14 @@ runDelayed :: Delayed env a
-> env
-> Request
-> ResourceT IO (RouteResult a)
runDelayed Delayed{..} env req =
runDelayedIO
(do c <- capturesD env
methodD
a <- authD
b <- bodyD
r <- ask
liftRouteResult (serverD c a b r)
)
req
runDelayed Delayed{..} env = runDelayedIO $ do
c <- capturesD env
methodD
a <- authD
b <- bodyD
r <- ask
p <- paramsD -- Has to be after body to respect the relative error order
liftRouteResult (serverD c p a b r)
-- | Runs a delayed server and the resulting action.
-- Takes a continuation that lets us send a response.

18
servant-server/test/Servant/Server/ErrorSpec.hs
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@ -9,6 +9,7 @@ module Servant.Server.ErrorSpec (spec) where
import Data.Aeson (encode)
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString.Lazy.Char8 as BCL
import Data.Monoid ((<>))
import Data.Proxy
import Network.HTTP.Types (hAccept, hAuthorization,
hContentType, methodGet,
@ -44,13 +45,14 @@ type ErrorOrderApi = "home"
:> BasicAuth "error-realm" ()
:> ReqBody '[JSON] Int
:> Capture "t" Int
:> QueryParam "param" Int
:> Post '[JSON] Int
errorOrderApi :: Proxy ErrorOrderApi
errorOrderApi = Proxy
errorOrderServer :: Server ErrorOrderApi
errorOrderServer = \_ _ _ -> throwError err402
errorOrderServer = \_ _ _ _ -> throwError err402
-- On error priorities:
--
@ -85,7 +87,8 @@ errorOrderSpec =
goodContentType = (hContentType, "application/json")
goodAccept = (hAccept, "application/json")
goodMethod = methodPost
goodUrl = "home/2"
goodUrl = "home/2?param=55"
badParams = goodUrl <> "?param=foo"
goodBody = encode (5 :: Int)
-- username:password = servant:server
goodAuth = (hAuthorization, "Basic c2VydmFudDpzZXJ2ZXI=")
@ -95,22 +98,24 @@ errorOrderSpec =
`shouldRespondWith` 404
it "has 405 as its second highest priority error" $ do
request badMethod goodUrl [badAuth, badContentType, badAccept] badBody
request badMethod badParams [badAuth, badContentType, badAccept] badBody
`shouldRespondWith` 405
it "has 401 as its third highest priority error (auth)" $ do
request goodMethod goodUrl [badAuth, badContentType, badAccept] badBody
request goodMethod badParams [badAuth, badContentType, badAccept] badBody
`shouldRespondWith` 401
it "has 406 as its fourth highest priority error" $ do
request goodMethod goodUrl [goodAuth, badContentType, badAccept] badBody
request goodMethod badParams [goodAuth, badContentType, badAccept] badBody
`shouldRespondWith` 406
it "has 415 as its fifth highest priority error" $ do
request goodMethod goodUrl [goodAuth, badContentType, goodAccept] badBody
request goodMethod badParams [goodAuth, badContentType, goodAccept] badBody
`shouldRespondWith` 415
it "has 400 as its sixth highest priority error" $ do
request goodMethod badParams [goodAuth, goodContentType, goodAccept] goodBody
`shouldRespondWith` 400
request goodMethod goodUrl [goodAuth, goodContentType, goodAccept] badBody
`shouldRespondWith` 400
@ -221,7 +226,6 @@ errorRetrySpec =
then Nothing
else Just "body not correct\n"
-- }}}
------------------------------------------------------------------------------
-- * Error Choice {{{

3
servant-server/test/Servant/Server/Internal/RoutingApplicationSpec.hs
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@ -59,11 +59,12 @@ delayed body srv = Delayed
{ capturesD = \_ -> return ()
, methodD = return ()
, authD = return ()
, paramsD = return ()
, bodyD = do
liftIO (writeTestResource"hia" >> putStrLn "garbage created")
_ <- register (freeTestResource >> putStrLn "garbage collected")
body
, serverD = \() () _body _req -> srv
, serverD = \() () () _body _req -> srv
}
simpleRun :: Delayed () (Handler ())

57
servant-server/test/Servant/ServerSpec.hs
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@ -275,12 +275,14 @@ captureAllSpec = do
type QueryParamApi = QueryParam "name" String :> Get '[JSON] Person
:<|> "a" :> QueryParams "names" String :> Get '[JSON] Person
:<|> "b" :> QueryFlag "capitalize" :> Get '[JSON] Person
:<|> "param" :> QueryParam "age" Integer :> Get '[JSON] Person
:<|> "multiparam" :> QueryParams "ages" Integer :> Get '[JSON] Person
queryParamApi :: Proxy QueryParamApi
queryParamApi = Proxy
qpServer :: Server QueryParamApi
qpServer = queryParamServer :<|> qpNames :<|> qpCapitalize
qpServer = queryParamServer :<|> qpNames :<|> qpCapitalize :<|> qpAge :<|> qpAges
where qpNames (_:name2:_) = return alice { name = name2 }
qpNames _ = return alice
@ -288,6 +290,11 @@ qpServer = queryParamServer :<|> qpNames :<|> qpCapitalize
qpCapitalize False = return alice
qpCapitalize True = return alice { name = map toUpper (name alice) }
qpAge Nothing = return alice
qpAge (Just age') = return alice{ age = age'}
qpAges ages = return alice{ age = sum ages}
queryParamServer (Just name_) = return alice{name = name_}
queryParamServer Nothing = return alice
@ -319,6 +326,54 @@ queryParamSpec = do
name = "john"
}
it "parses a query parameter" $
(flip runSession) (serve queryParamApi qpServer) $ do
let params = "?age=55"
response <- Network.Wai.Test.request defaultRequest{
rawQueryString = params,
queryString = parseQuery params,
pathInfo = ["param"]
}
liftIO $
decode' (simpleBody response) `shouldBe` Just alice{
age = 55
}
it "generates an error on query parameter parse failure" $
(flip runSession) (serve queryParamApi qpServer) $ do
let params = "?age=foo"
response <- Network.Wai.Test.request defaultRequest{
rawQueryString = params,
queryString = parseQuery params,
pathInfo = ["param"]
}
liftIO $ statusCode (simpleStatus response) `shouldBe` 400
return ()
it "parses multiple query parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
let params = "?ages=10&ages=22"
response <- Network.Wai.Test.request defaultRequest{
rawQueryString = params,
queryString = parseQuery params,
pathInfo = ["multiparam"]
}
liftIO $
decode' (simpleBody response) `shouldBe` Just alice{
age = 32
}
it "generates an error on parse failures of multiple parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
let params = "?ages=2&ages=foo"
response <- Network.Wai.Test.request defaultRequest{
rawQueryString = params,
queryString = parseQuery params,
pathInfo = ["multiparam"]
}
liftIO $ statusCode (simpleStatus response) `shouldBe` 400
return ()
it "allows retrieving value-less GET parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do