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Add Content Types.

Browse source 
Still needs QQ.
This commit is contained in:
Julian K. Arni 2015-01-08 16:24:19 +01:00
parent 648dc2f2fb
commit 8930a45403
11 changed files with 158 additions and 36 deletions
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12
default.nix Normal file
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@ -0,0 +1,12 @@
{ pkgs ? import <nixpkgs> { config.allowUnfree = true; }
, src ? builtins.filterSource (path: type:
type != "unknown" &&
baseNameOf path != ".git" &&
baseNameOf path != "result" &&
baseNameOf path != "dist") ./.
}:
pkgs.haskellPackages.buildLocalCabalWithArgs {
name = "servant";
inherit src;
args = {};
}

3
servant.cabal
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@ -28,6 +28,7 @@ library
Servant.API
Servant.API.Alternative
Servant.API.Capture
Servant.API.ContentTypes
Servant.API.Delete
Servant.API.Get
Servant.API.Header
@ -44,6 +45,8 @@ library
Servant.Utils.Links
build-depends:
base >=4.7 && <5
, bytestring == 0.10.*
, http-types == 0.8.*
, text >= 1
, template-haskell
, parsec >= 3.1

4
src/Servant/API.hs
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@ -30,6 +30,9 @@ module Servant.API (
-- | PATCH requests
module Servant.API.Patch,
-- * Content Types
module Servant.API.ContentTypes,
-- * Untyped endpoints
-- | Plugging in a wai 'Network.Wai.Application', serving directories
module Servant.API.Raw,
@ -43,6 +46,7 @@ module Servant.API (
import Servant.API.Alternative ( (:<|>)(..) )
import Servant.API.Capture ( Capture )
import Servant.API.ContentTypes ( Accept(..), MimeRender(..), HTML, XML, JSON )
import Servant.API.Delete ( Delete )
import Servant.API.Get ( Get )
import Servant.API.Header ( Header )

55
src/Servant/API/ContentTypes.hs Normal file
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@ -0,0 +1,55 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeOperators #-}
module Servant.API.ContentTypes where
import Data.ByteString (ByteString)
import Data.Proxy (Proxy(..))
import Data.Typeable (Typeable)
data XML deriving Typeable
data HTML deriving Typeable
data JSON deriving Typeable
type ContentTypeBS = ByteString
class Accept ctype where
isContentType :: Proxy ctype -> ByteString -> Bool
contentType :: Proxy ctype -> ContentTypeBS
isContentType p bs = bs == contentType p
instance Accept HTML where
contentType _ = "text/html"
instance Accept JSON where
contentType _ = "application/json"
instance Accept XML where
contentType _ = "application/xml"
-- | Instantiate this class to register a way of serializing a type based
-- on the @Accept@ header.
class Accept ctype => MimeRender ctype a where
toByteString :: Proxy ctype -> a -> ByteString
class AllCTRender list a where
handleAcceptH :: Proxy list -> ContentTypeBS -> a -> (ByteString, ContentTypeBS)
instance MimeRender ctyp a => AllCTRender '[ctyp] a where
handleAcceptH _ accept val = (toByteString pctyp val, accept)
where pctyp = Proxy :: Proxy ctyp
instance ( MimeRender ctyp a
, AllCTRender ctyps a
) => AllCTRender (ctyp ': ctyps) a where
handleAcceptH _ accept val
| isContentType pctyp accept = (toByteString pctyp val, accept)
| otherwise = handleAcceptH pctyps accept val
where pctyp = Proxy :: Proxy ctyp
pctyps = Proxy :: Proxy ctyps

4
src/Servant/API/ContentTypes/HTML.hs Normal file
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@ -0,0 +1,4 @@
module Servant.API.ContentTypes.HTML where
data HTML
deriving Typeable

6
src/Servant/API/Get.hs
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@ -1,4 +1,6 @@
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE KindSignatures #-}
module Servant.API.Get where
import Data.Typeable ( Typeable )
@ -7,6 +9,6 @@ import Data.Typeable ( Typeable )
--
-- Example:
--
-- > type MyApi = "books" :> Get [Book]
data Get a
-- > type MyApi = "books" :> Get '[JSON] [Book]
data Get (cts::[*]) a
deriving Typeable

6
src/Servant/API/Post.hs
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@ -1,4 +1,6 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE KindSignatures #-}
module Servant.API.Post where
import Data.Typeable ( Typeable )
@ -12,6 +14,6 @@ import Data.Typeable ( Typeable )
-- > -- POST /books
-- > -- with a JSON encoded Book as the request body
-- > -- returning the just-created Book
-- > type MyApi = "books" :> ReqBody Book :> Post Book
data Post a
-- > type MyApi = "books" :> ReqBody Book :> Post '[JSON] Book
data Post (cts::[*]) a
deriving Typeable

6
src/Servant/API/Put.hs
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@ -1,4 +1,6 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE KindSignatures #-}
module Servant.API.Put where
import Data.Typeable ( Typeable )
@ -10,6 +12,6 @@ import Data.Typeable ( Typeable )
--
-- > -- PUT /books/:isbn
-- > -- with a Book as request body, returning the updated Book
-- > type MyApi = "books" :> Capture "isbn" Text :> ReqBody Book :> Put Book
data Put a
-- > type MyApi = "books" :> Capture "isbn" Text :> ReqBody Book :> Put '[JSON] Book
data Put (cts::[*]) a
deriving Typeable

44
src/Servant/Utils/Links.hs
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@ -122,6 +122,14 @@ import Servant.API.Sub ( type (:>) )
import Servant.API.Raw ( Raw )
import Servant.API.Alternative ( type (:<|>) )
-- | A safe link datatype.
-- The only way of constructing a 'Link' is using 'safeLink', which means any
-- 'Link' is guaranteed to be part of the mentioned API.
data Link = Link
{ _segments :: [String] -- ^ Segments of "foo/bar" would be ["foo", "bar"]
, _queryParams :: [Param Query]
} deriving Show
-- | If either a or b produce an empty constraint, produce an empty constraint.
type family Or (a :: Constraint) (b :: Constraint) :: Constraint where
Or () b = ()
@ -156,14 +164,26 @@ type family IsElem endpoint api :: Constraint where
IsElem sa (MatrixFlag x :> sb) = IsElem sa sb
IsElem e e = ()
IsElem e a = IsElem' e a
IsElem (Get ct typ) (Get ct' typ) = IsSubList ct ct'
IsElem (Post ct typ) (Post ct' typ) = IsSubList ct ct'
IsElem (Put ct typ) (Put ct' typ) = IsSubList ct ct'
IsElem e e = 'True
IsElem e a = 'False
-- | A safe link datatype.
-- The only way of constructing a 'Link' is using 'safeLink', which means any
-- 'Link' is guaranteed to be part of the mentioned API.
data Link = Link
{ _segments :: [String] -- ^ Segments of "foo/bar" would be ["foo", "bar"]
, _queryParams :: [Param Query]
} deriving Show
type family IsSubList a b where
IsSubList '[] b = 'True
IsSubList '[x] (x ': xs) = 'True
IsSubList '[x] (y ': ys) = IsSubList '[x] ys
IsSubList (x ': xs) y = IsSubList '[x] y `And` IsSubList xs y
IsSubList a b = 'False
type family IsLink'' l where
IsLink'' (e :> Get cts x) = IsLink' e
IsLink'' (e :> Post cts x) = IsLink' e
IsLink'' (e :> Put cts x) = IsLink' e
IsLink'' (e :> Delete) = IsLink' e
IsLink'' a = 'False
-- Phantom types for Param
@ -317,16 +337,16 @@ instance (ToText v, HasLink sub)
addSegment (escape . unpack $ toText v) l
-- Verb (terminal) instances
instance HasLink (Get r) where
type MkLink (Get r) = URI
instance HasLink (Get y r) where
type MkLink (Get y r) = URI
toLink _ = linkURI
instance HasLink (Post r) where
type MkLink (Post r) = URI
type MkLink (Post y r) = URI
toLink _ = linkURI
instance HasLink (Put r) where
type MkLink (Put r) = URI
instance HasLink (Put y r) where
type MkLink (Put y r) = URI
toLink _ = linkURI
instance HasLink Delete where

24
test/Servant/QQSpec.hs
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@ -9,8 +9,10 @@
{-# LANGUAGE UndecidableInstances #-}
module Servant.QQSpec where
import Test.Hspec ( Expectation, Spec, shouldBe, it, describe )
import Test.Hspec ( Expectation, Spec, shouldBe, it, describe, pendingWith )
spec = describe "this" $ it "is" $ pendingWith "playing around"
{-
import Servant.API
( (:<|>),
ReqBody,
@ -21,6 +23,7 @@ import Servant.API
Post,
Capture,
(:>),
JSON,
sitemap )
--------------------------------------------------------------------------
@ -31,14 +34,14 @@ import Servant.API
type SimpleGet = [sitemap|
GET hello ()
|]
type SimpleGet' = "hello" :> Get ()
type SimpleGet'' = "hello" :> Get Bool
type SimpleGet' = "hello" :> Get '[JSON] ()
type SimpleGet'' = "hello" :> Get '[JSON] Bool
type SimpleGet2 = [sitemap|
GET hello Bool
|]
type SimpleGet2' = "hello" :> Get Bool
type SimpleGet2'' = "hello" :> Get Int
type SimpleGet2' = "hello" :> Get '[JSON] Bool
type SimpleGet2'' = "hello" :> Get '[JSON] Int
type SimplePost = [sitemap|
POST hello ()
@ -106,18 +109,18 @@ type TwoPaths = [sitemap|
POST hello Bool
GET hello Bool
|]
type TwoPaths' = ("hello" :> Post Bool) :<|> ("hello" :> Get Bool)
type TwoPaths' = ("hello" :> Post Bool) :<|> ("hello" :> Get '[JSON] Bool)
type WithInlineComments = [sitemap|
GET hello Bool -- This is a comment
|]
type WithInlineComments' = "hello" :> Get Bool
type WithInlineComments' = "hello" :> Get '[JSON] Bool
type WithInlineComments2 = [sitemap|
GET hello Bool
-- This is a comment
|]
type WithInlineComments2' = "hello" :> Get Bool
type WithInlineComments2' = "hello" :> Get '[JSON] Bool
type WithBlockComments = [sitemap|
@ -125,7 +128,7 @@ GET hello Bool {-
POST hello Bool
-}
|]
type WithBlockComments' = "hello" :> Get Bool
type WithBlockComments' = "hello" :> Get '[JSON] Bool
type WithBlockComments2 = [sitemap|
GET hello Bool {-
@ -133,7 +136,7 @@ POST hello Bool
-}
POST hello Bool
|]
type WithBlockComments2' = ("hello" :> Get Bool) :<|> ("hello" :> Post Bool)
type WithBlockComments2' = ("hello" :> Get '[JSON] Bool) :<|> ("hello" :> Post Bool)
--------------------------------------------------------------------------
-- Spec
@ -185,6 +188,7 @@ spec = do
(u::WithBlockComments) ~= (u::WithBlockComments') ~> True
(u::WithBlockComments2) ~= (u::WithBlockComments2') ~> True
-}
--------------------------------------------------------------------------
-- Utilities

30
test/Servant/Utils/LinksSpec.hs
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@ -8,29 +8,43 @@ module Servant.Utils.LinksSpec where
import Test.Hspec ( Spec, it, describe, shouldBe, Expectation )
import Data.Proxy ( Proxy(..) )
import Servant.API
import Servant.API ( type (:<|>), ReqBody, QueryParam, MatrixParam, MatrixParams
, MatrixFlag, Get, Post, Capture, type (:>) , HTML , JSON, XML )
import Servant.QQSpec ( (~>) )
import Servant.Utils.Links ( IsElem, IsLink )
<<<<<<< HEAD
type TestApi =
-- Capture and query/matrix params
"hello" :> Capture "name" String :> QueryParam "capital" Bool :> Delete
:<|> "parent" :> MatrixParams "name" String :> "child"
:> MatrixParam "gender" String :> Get String
:> MatrixParam "gender" String :> Get '[JSON] String
-- Flags
:<|> "ducks" :> MatrixFlag "yellow" :> MatrixFlag "loud" :> Delete
:<|> "balls" :> QueryFlag "bouncy" :> QueryFlag "fast" :> Delete
-- All of the verbs
:<|> "get" :> Get ()
:<|> "put" :> Put ()
:<|> "post" :> ReqBody 'True :> Post ()
:<|> "get" :> Get '[JSON] ()
:<|> "put" :> Put '[JSON] ()
:<|> "post" :> ReqBody 'True :> Post '[JSON] ()
:<|> "delete" :> Header "ponies" :> Delete
:<|> "raw" :> Raw
type TestLink = "hello" :> "hi" :> Get Bool
type TestLink2 = "greet" :> Post Bool
type TestLink3 = "parent" :> "child" :> Get String
type TestLink = "hello" :> "hi" :> Get '[JSON] Bool
type TestLink2 = "greet" :> Post '[XML] Bool
type TestLink3 = "parent" :> "child" :> Get '[JSON] String
type BadTestLink = "hallo" :> "hi" :> Get '[JSON] Bool
type BadTestLink2 = "greet" :> Get '[XML] Bool
type BadTestLink3 = "parent" :> "child" :> MatrixFlag "male" :> Get '[JSON] String
type BadTestLink' = "hello" :> "hi" :> Get '[HTML] Bool
type BadTestLink'2 = "greet" :> Get '[HTML] Bool
type NotALink = "hello" :> Capture "x" Bool :> Get '[JSON] Bool
type NotALink2 = "hello" :> ReqBody 'True :> Get '[JSON] Bool
apiLink :: (IsElem endpoint TestApi, HasLink endpoint)
=> Proxy endpoint -> MkLink endpoint