servant/servant-server/test/Servant/ServerSpec.hs

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{-# LANGUAGE CPP #-}
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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE PolyKinds #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
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{-# LANGUAGE TypeSynonymInstances #-}
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module Servant.ServerSpec where
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#if !MIN_VERSION_base(4,8,0)
import Control.Applicative ((<$>))
#endif
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import Control.Monad (forM_, when, unless)
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import Control.Monad.Trans.Except (ExceptT, throwE)
import Data.Aeson (FromJSON, ToJSON, decode', encode)
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import qualified Data.ByteString.Base64 as Base64
import Data.ByteString.Conversion ()
import Data.Char (toUpper)
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import Data.Monoid
import Data.Proxy (Proxy (Proxy))
import Data.String (fromString)
import Data.String.Conversions (cs)
import qualified Data.Text as T
import GHC.Generics (Generic)
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import Network.HTTP.Types (Status (..), hAccept, hContentType,
methodDelete, methodGet,
methodHead, methodPatch,
methodPost, methodPut, ok200,
imATeaPot418,
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parseQuery)
import Network.Wai (Application, Request, requestHeaders, pathInfo,
queryString, rawQueryString,
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responseBuilder, responseLBS)
import Network.Wai.Internal (Response (ResponseBuilder))
import Network.Wai.Test (defaultRequest, request,
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runSession, simpleBody,
simpleHeaders, simpleStatus)
import Servant.API ((:<|>) (..), (:>), AuthProtect,
BasicAuth, BasicAuthData(BasicAuthData),
Capture, Delete, Get, Header (..),
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Headers, HttpVersion,
IsSecure (..), JSON,
NoContent (..), Patch, PlainText,
Post, Put,
QueryFlag, QueryParam, QueryParams,
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Raw, RemoteHost, ReqBody,
StdMethod (..), Verb, addHeader)
import Servant.API.Internal.Test.ComprehensiveAPI
import Servant.Server (ServantErr (..), Server, err401, err403, err404,
serve, serveWithContext, Context((:.), EmptyContext))
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import Test.Hspec (Spec, context, describe, it,
shouldBe, shouldContain)
import qualified Test.Hspec.Wai as THW
import Test.Hspec.Wai (get, liftIO, matchHeaders,
matchStatus, shouldRespondWith,
with, (<:>))
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import Servant.Server.Internal.BasicAuth (BasicAuthCheck(BasicAuthCheck),
BasicAuthResult(Authorized,Unauthorized))
import Servant.Server.Experimental.Auth
(AuthHandler, AuthServerData,
mkAuthHandler)
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import Servant.Server.Internal.RoutingApplication
(toApplication, RouteResult(..))
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import Servant.Server.Internal.Router
(tweakResponse, runRouter,
Router, Router'(LeafRouter))
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import Servant.Server.Internal.Context
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(NamedContext(..))
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-- * comprehensive api test
-- This declaration simply checks that all instances are in place.
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_ = serveWithContext comprehensiveAPI comprehensiveApiContext
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comprehensiveApiContext :: Context '[NamedContext "foo" '[]]
comprehensiveApiContext = NamedContext EmptyContext :. EmptyContext
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-- * Specs
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spec :: Spec
spec = do
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verbSpec
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captureSpec
queryParamSpec
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reqBodySpec
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headerSpec
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rawSpec
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alternativeSpec
responseHeadersSpec
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routerSpec
miscCombinatorSpec
basicAuthSpec
genAuthSpec
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------------------------------------------------------------------------------
-- * verbSpec {{{
------------------------------------------------------------------------------
type VerbApi method status
= Verb method status '[JSON] Person
:<|> "noContent" :> Verb method status '[JSON] NoContent
:<|> "header" :> Verb method status '[JSON] (Headers '[Header "H" Int] Person)
:<|> "headerNC" :> Verb method status '[JSON] (Headers '[Header "H" Int] NoContent)
verbSpec :: Spec
verbSpec = describe "Servant.API.Verb" $ do
let server :: Server (VerbApi method status)
server = return alice
:<|> return NoContent
:<|> return (addHeader 5 alice)
:<|> return (addHeader 10 NoContent)
get200 = Proxy :: Proxy (VerbApi 'GET 200)
post210 = Proxy :: Proxy (VerbApi 'POST 210)
put203 = Proxy :: Proxy (VerbApi 'PUT 203)
delete280 = Proxy :: Proxy (VerbApi 'DELETE 280)
patch214 = Proxy :: Proxy (VerbApi 'PATCH 214)
wrongMethod m = if m == methodPatch then methodPost else methodPatch
test desc api method (status :: Int) = context desc $
with (return $ serve api server) $ do
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-- HEAD and 214/215 need not return bodies
unless (status `elem` [214, 215] || method == methodHead) $
it "returns the person" $ do
response <- THW.request method "/" [] ""
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liftIO $ statusCode (simpleStatus response) `shouldBe` status
liftIO $ decode' (simpleBody response) `shouldBe` Just alice
it "returns no content on NoContent" $ do
response <- THW.request method "/noContent" [] ""
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liftIO $ statusCode (simpleStatus response) `shouldBe` status
liftIO $ simpleBody response `shouldBe` ""
-- HEAD should not return body
when (method == methodHead) $
it "HEAD returns no content body" $ do
response <- THW.request method "/" [] ""
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liftIO $ simpleBody response `shouldBe` ""
it "throws 405 on wrong method " $ do
THW.request (wrongMethod method) "/" [] ""
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`shouldRespondWith` 405
it "returns headers" $ do
response1 <- THW.request method "/header" [] ""
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liftIO $ statusCode (simpleStatus response1) `shouldBe` status
liftIO $ simpleHeaders response1 `shouldContain` [("H", "5")]
response2 <- THW.request method "/header" [] ""
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liftIO $ statusCode (simpleStatus response2) `shouldBe` status
liftIO $ simpleHeaders response2 `shouldContain` [("H", "5")]
it "handles trailing '/' gracefully" $ do
response <- THW.request method "/headerNC/" [] ""
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liftIO $ statusCode (simpleStatus response) `shouldBe` status
it "returns 406 if the Accept header is not supported" $ do
THW.request method "" [(hAccept, "crazy/mime")] ""
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`shouldRespondWith` 406
it "responds if the Accept header is supported" $ do
response <- THW.request method ""
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[(hAccept, "application/json")] ""
liftIO $ statusCode (simpleStatus response) `shouldBe` status
it "sets the Content-Type header" $ do
response <- THW.request method "" [] ""
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liftIO $ simpleHeaders response `shouldContain`
[("Content-Type", "application/json")]
test "GET 200" get200 methodGet 200
test "POST 210" post210 methodPost 210
test "PUT 203" put203 methodPut 203
test "DELETE 280" delete280 methodDelete 280
test "PATCH 214" patch214 methodPatch 214
test "GET 200 with HEAD" get200 methodHead 200
-- }}}
------------------------------------------------------------------------------
-- * captureSpec {{{
------------------------------------------------------------------------------
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type CaptureApi = Capture "legs" Integer :> Get '[JSON] Animal
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captureApi :: Proxy CaptureApi
captureApi = Proxy
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captureServer :: Integer -> ExceptT ServantErr IO Animal
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captureServer legs = case legs of
4 -> return jerry
2 -> return tweety
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_ -> throwE err404
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captureSpec :: Spec
captureSpec = do
describe "Servant.API.Capture" $ do
with (return (serve captureApi captureServer)) $ do
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it "can capture parts of the 'pathInfo'" $ do
response <- get "/2"
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liftIO $ decode' (simpleBody response) `shouldBe` Just tweety
it "returns 400 if the decoding fails" $ do
get "/notAnInt" `shouldRespondWith` 400
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with (return (serve
(Proxy :: Proxy (Capture "captured" String :> Raw))
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(\ "captured" request_ respond ->
respond $ responseLBS ok200 [] (cs $ show $ pathInfo request_)))) $ do
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it "strips the captured path snippet from pathInfo" $ do
get "/captured/foo" `shouldRespondWith` (fromString (show ["foo" :: String]))
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-- }}}
------------------------------------------------------------------------------
-- * queryParamSpec {{{
------------------------------------------------------------------------------
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type QueryParamApi = QueryParam "name" String :> Get '[JSON] Person
:<|> "a" :> QueryParams "names" String :> Get '[JSON] Person
:<|> "b" :> QueryFlag "capitalize" :> Get '[JSON] Person
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queryParamApi :: Proxy QueryParamApi
queryParamApi = Proxy
qpServer :: Server QueryParamApi
qpServer = queryParamServer :<|> qpNames :<|> qpCapitalize
where qpNames (_:name2:_) = return alice { name = name2 }
qpNames _ = return alice
qpCapitalize False = return alice
qpCapitalize True = return alice { name = map toUpper (name alice) }
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queryParamServer (Just name_) = return alice{name = name_}
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queryParamServer Nothing = return alice
queryParamSpec :: Spec
queryParamSpec = do
describe "Servant.API.QueryParam" $ do
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it "allows retrieving simple GET parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
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let params1 = "?name=bob"
response1 <- Network.Wai.Test.request defaultRequest{
rawQueryString = params1,
queryString = parseQuery params1
}
liftIO $ do
decode' (simpleBody response1) `shouldBe` Just alice{
name = "bob"
}
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it "allows retrieving lists in GET parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
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let params2 = "?names[]=bob&names[]=john"
response2 <- Network.Wai.Test.request defaultRequest{
rawQueryString = params2,
queryString = parseQuery params2,
pathInfo = ["a"]
}
liftIO $
decode' (simpleBody response2) `shouldBe` Just alice{
name = "john"
}
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it "allows retrieving value-less GET parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
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let params3 = "?capitalize"
response3 <- Network.Wai.Test.request defaultRequest{
rawQueryString = params3,
queryString = parseQuery params3,
pathInfo = ["b"]
}
liftIO $
decode' (simpleBody response3) `shouldBe` Just alice{
name = "ALICE"
}
let params3' = "?capitalize="
response3' <- Network.Wai.Test.request defaultRequest{
rawQueryString = params3',
queryString = parseQuery params3',
pathInfo = ["b"]
}
liftIO $
decode' (simpleBody response3') `shouldBe` Just alice{
name = "ALICE"
}
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let params3'' = "?unknown="
response3'' <- Network.Wai.Test.request defaultRequest{
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rawQueryString = params3'',
queryString = parseQuery params3'',
pathInfo = ["b"]
}
liftIO $
decode' (simpleBody response3'') `shouldBe` Just alice{
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name = "Alice"
}
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-- }}}
------------------------------------------------------------------------------
-- * reqBodySpec {{{
------------------------------------------------------------------------------
type ReqBodyApi = ReqBody '[JSON] Person :> Post '[JSON] Person
:<|> "blah" :> ReqBody '[JSON] Person :> Put '[JSON] Integer
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reqBodyApi :: Proxy ReqBodyApi
reqBodyApi = Proxy
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reqBodySpec :: Spec
reqBodySpec = describe "Servant.API.ReqBody" $ do
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let server :: Server ReqBodyApi
server = return :<|> return . age
mkReq method x = THW.request method x
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[(hContentType, "application/json;charset=utf-8")]
with (return $ serve reqBodyApi server) $ do
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it "passes the argument to the handler" $ do
response <- mkReq methodPost "" (encode alice)
liftIO $ decode' (simpleBody response) `shouldBe` Just alice
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it "rejects invalid request bodies with status 400" $ do
mkReq methodPut "/blah" "some invalid body" `shouldRespondWith` 400
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it "responds with 415 if the request body media type is unsupported" $ do
THW.request methodPost "/"
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[(hContentType, "application/nonsense")] "" `shouldRespondWith` 415
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-- }}}
------------------------------------------------------------------------------
-- * headerSpec {{{
------------------------------------------------------------------------------
type HeaderApi a = Header "MyHeader" a :> Delete '[JSON] ()
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headerApi :: Proxy (HeaderApi a)
headerApi = Proxy
headerSpec :: Spec
headerSpec = describe "Servant.API.Header" $ do
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let expectsInt :: Maybe Int -> ExceptT ServantErr IO ()
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expectsInt (Just x) = when (x /= 5) $ error "Expected 5"
expectsInt Nothing = error "Expected an int"
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let expectsString :: Maybe String -> ExceptT ServantErr IO ()
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expectsString (Just x) = when (x /= "more from you") $ error "Expected more from you"
expectsString Nothing = error "Expected a string"
with (return (serve headerApi expectsInt)) $ do
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let delete' x = THW.request methodDelete x [("MyHeader", "5")]
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it "passes the header to the handler (Int)" $
delete' "/" "" `shouldRespondWith` 200
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with (return (serve headerApi expectsString)) $ do
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let delete' x = THW.request methodDelete x [("MyHeader", "more from you")]
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it "passes the header to the handler (String)" $
delete' "/" "" `shouldRespondWith` 200
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-- }}}
------------------------------------------------------------------------------
-- * rawSpec {{{
------------------------------------------------------------------------------
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type RawApi = "foo" :> Raw
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rawApi :: Proxy RawApi
rawApi = Proxy
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rawApplication :: Show a => (Request -> a) -> Application
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rawApplication f request_ respond = respond $ responseLBS ok200 []
(cs $ show $ f request_)
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rawSpec :: Spec
rawSpec = do
describe "Servant.API.Raw" $ do
it "runs applications" $ do
(flip runSession) (serve rawApi (rawApplication (const (42 :: Integer)))) $ do
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response <- Network.Wai.Test.request defaultRequest{
pathInfo = ["foo"]
}
liftIO $ do
simpleBody response `shouldBe` "42"
it "gets the pathInfo modified" $ do
(flip runSession) (serve rawApi (rawApplication pathInfo)) $ do
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response <- Network.Wai.Test.request defaultRequest{
pathInfo = ["foo", "bar"]
}
liftIO $ do
simpleBody response `shouldBe` cs (show ["bar" :: String])
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-- }}}
------------------------------------------------------------------------------
-- * alternativeSpec {{{
------------------------------------------------------------------------------
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type AlternativeApi =
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"foo" :> Get '[JSON] Person
:<|> "bar" :> Get '[JSON] Animal
:<|> "foo" :> Get '[PlainText] T.Text
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:<|> "bar" :> Post '[JSON] Animal
:<|> "bar" :> Put '[JSON] Animal
:<|> "bar" :> Delete '[JSON] ()
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alternativeApi :: Proxy AlternativeApi
alternativeApi = Proxy
alternativeServer :: Server AlternativeApi
alternativeServer =
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return alice
:<|> return jerry
:<|> return "a string"
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:<|> return jerry
:<|> return jerry
:<|> return ()
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alternativeSpec :: Spec
alternativeSpec = do
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describe "Servant.API.Alternative" $ do
with (return $ serve alternativeApi alternativeServer) $ do
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it "unions endpoints" $ do
response <- get "/foo"
liftIO $ do
decode' (simpleBody response) `shouldBe`
Just alice
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response_ <- get "/bar"
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liftIO $ do
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decode' (simpleBody response_) `shouldBe`
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Just jerry
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it "checks all endpoints before returning 415" $ do
get "/foo" `shouldRespondWith` 200
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it "returns 404 if the path does not exist" $ do
get "/nonexistent" `shouldRespondWith` 404
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-- }}}
------------------------------------------------------------------------------
-- * responseHeaderSpec {{{
------------------------------------------------------------------------------
type ResponseHeadersApi =
Get '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
:<|> Post '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
:<|> Put '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
:<|> Patch '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
responseHeadersServer :: Server ResponseHeadersApi
responseHeadersServer = let h = return $ addHeader 5 $ addHeader "kilroy" "hi"
in h :<|> h :<|> h :<|> h
responseHeadersSpec :: Spec
responseHeadersSpec = describe "ResponseHeaders" $ do
with (return $ serve (Proxy :: Proxy ResponseHeadersApi) responseHeadersServer) $ do
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let methods = [methodGet, methodPost, methodPut, methodPatch]
it "includes the headers in the response" $
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forM_ methods $ \method ->
THW.request method "/" [] ""
`shouldRespondWith` "\"hi\""{ matchHeaders = ["H1" <:> "5", "H2" <:> "kilroy"]
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, matchStatus = 200
}
it "responds with not found for non-existent endpoints" $
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forM_ methods $ \method ->
THW.request method "blahblah" [] ""
`shouldRespondWith` 404
it "returns 406 if the Accept header is not supported" $
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forM_ methods $ \method ->
THW.request method "" [(hAccept, "crazy/mime")] ""
`shouldRespondWith` 406
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-- }}}
------------------------------------------------------------------------------
-- * routerSpec {{{
------------------------------------------------------------------------------
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routerSpec :: Spec
routerSpec = do
describe "Servant.Server.Internal.Router" $ do
let app' :: Application
app' = toApplication $ runRouter router'
router', router :: Router
router' = tweakResponse (twk <$>) router
router = LeafRouter $ \_ cont -> cont (Route $ responseBuilder (Status 201 "") [] "")
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twk :: Response -> Response
twk (ResponseBuilder (Status i s) hs b) = ResponseBuilder (Status (i + 1) s) hs b
twk b = b
describe "tweakResponse" . with (return app') $ do
it "calls f on route result" $ do
get "" `shouldRespondWith` 202
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-- }}}
------------------------------------------------------------------------------
-- * miscCombinatorSpec {{{
------------------------------------------------------------------------------
type MiscCombinatorsAPI
= "version" :> HttpVersion :> Get '[JSON] String
:<|> "secure" :> IsSecure :> Get '[JSON] String
:<|> "host" :> RemoteHost :> Get '[JSON] String
miscApi :: Proxy MiscCombinatorsAPI
miscApi = Proxy
miscServ :: Server MiscCombinatorsAPI
miscServ = versionHandler
:<|> secureHandler
:<|> hostHandler
where versionHandler = return . show
secureHandler Secure = return "secure"
secureHandler NotSecure = return "not secure"
hostHandler = return . show
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miscCombinatorSpec :: Spec
miscCombinatorSpec = with (return $ serve miscApi miscServ) $
describe "Misc. combinators for request inspection" $ do
it "Successfully gets the HTTP version specified in the request" $
go "/version" "\"HTTP/1.0\""
it "Checks that hspec-wai uses HTTP, not HTTPS" $
go "/secure" "\"not secure\""
it "Checks that hspec-wai issues request from 0.0.0.0" $
go "/host" "\"0.0.0.0:0\""
where go path res = Test.Hspec.Wai.get path `shouldRespondWith` res
-- }}}
------------------------------------------------------------------------------
-- * Basic Authentication {{{
------------------------------------------------------------------------------
type BasicAuthAPI =
BasicAuth "foo" () :> "basic" :> Get '[JSON] Animal
:<|> Raw
basicAuthApi :: Proxy BasicAuthAPI
basicAuthApi = Proxy
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basicAuthServer :: Server BasicAuthAPI
basicAuthServer =
const (return jerry) :<|>
(\ _ respond -> respond $ responseLBS imATeaPot418 [] "")
basicAuthContext :: Context '[ BasicAuthCheck () ]
basicAuthContext =
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let basicHandler = BasicAuthCheck $ \(BasicAuthData usr pass) ->
if usr == "servant" && pass == "server"
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then return (Authorized ())
else return Unauthorized
in basicHandler :. EmptyContext
basicAuthSpec :: Spec
basicAuthSpec = do
describe "Servant.API.BasicAuth" $ do
with (return (serveWithContext basicAuthApi basicAuthContext basicAuthServer)) $ do
context "Basic Authentication" $ do
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let basicAuthHeaders user password =
[("Authorization", "Basic " <> Base64.encode (user <> ":" <> password))]
it "returns 401 when no credentials given" $ do
get "/basic" `shouldRespondWith` 401
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it "returns 403 when invalid credentials given" $ do
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THW.request methodGet "/basic" (basicAuthHeaders "servant" "wrong") ""
`shouldRespondWith` 403
it "returns 200 with the right password" $ do
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THW.request methodGet "/basic" (basicAuthHeaders "servant" "server") ""
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`shouldRespondWith` 200
it "plays nice with subsequent Raw endpoints" $ do
get "/foo" `shouldRespondWith` 418
-- }}}
------------------------------------------------------------------------------
-- * General Authentication {{{
------------------------------------------------------------------------------
type GenAuthAPI = AuthProtect "auth" :> "auth" :> Get '[JSON] Animal
:<|> Raw
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genAuthApi :: Proxy GenAuthAPI
genAuthApi = Proxy
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genAuthServer :: Server GenAuthAPI
genAuthServer = const (return tweety)
:<|> (\ _ respond -> respond $ responseLBS imATeaPot418 [] "")
type instance AuthServerData (AuthProtect "auth") = ()
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genAuthContext :: Context '[AuthHandler Request ()]
genAuthContext =
let authHandler = \req -> case lookup "Auth" (requestHeaders req) of
Just "secret" -> return ()
Just _ -> throwE err403
Nothing -> throwE err401
in mkAuthHandler authHandler :. EmptyContext
genAuthSpec :: Spec
genAuthSpec = do
describe "Servant.API.Auth" $ do
with (return (serveWithContext genAuthApi genAuthContext genAuthServer)) $ do
context "Custom Auth Protection" $ do
it "returns 401 when missing headers" $ do
get "/auth" `shouldRespondWith` 401
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it "returns 403 on wrong passwords" $ do
THW.request methodGet "/auth" [("Auth","wrong")] "" `shouldRespondWith` 403
it "returns 200 with the right header" $ do
THW.request methodGet "/auth" [("Auth","secret")] "" `shouldRespondWith` 200
it "plays nice with subsequent Raw endpoints" $ do
get "/foo" `shouldRespondWith` 418
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-- }}}
------------------------------------------------------------------------------
-- * Test data types {{{
------------------------------------------------------------------------------
data Person = Person {
name :: String,
age :: Integer
}
deriving (Eq, Show, Generic)
instance ToJSON Person
instance FromJSON Person
alice :: Person
alice = Person "Alice" 42
data Animal = Animal {
species :: String,
numberOfLegs :: Integer
}
deriving (Eq, Show, Generic)
instance ToJSON Animal
instance FromJSON Animal
jerry :: Animal
jerry = Animal "Mouse" 4
tweety :: Animal
tweety = Animal "Bird" 2
-- }}}