eeva/servant
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Merge remote-tracking branch 'servant-server/prepare-merge' into merge

Browse source
This commit is contained in:
Julian K. Arni 2015-04-20 11:23:33 +02:00
commit 29a54fe290
16 changed files with 1978 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
servant-server/CHANGELOG.md Normal file
View file

@ -0,0 +1,26 @@
0.3
---
* Add a `RouteMismatch` constructor for arbitrary HTTP response codes (https://github.com/haskell-servant/servant-server/pull/22)
* Add support for the `Patch` combinator
* Support for `Accept`/`Content-type` headers and for the content-type aware combinators in *servant-0.3*
* Export `toApplication` from `Servant.Server` (https://github.com/haskell-servant/servant-server/pull/29)
* Support other Monads than just `EitherT (Int, String) IO` (https://github.com/haskell-servant/servant-server/pull/21)
* Canonicalize API types before generating the handler types with `Server`
* Make methods return status code 204 if they return () (https://github.com/haskell-servant/servant-server/issues/28)
* Add server support for response headers
0.2.4
-----
* Added support for matrix parameters, see e.g. http://www.w3.org/DesignIssues/MatrixURIs.html
* Add support for serializing based on Accept header
(https://github.com/haskell-servant/servant-server/issues/9)
* Ignore trailing slashes
(https://github.com/haskell-servant/servant-server/issues/5)
0.2.3
-----
* Fix consuming request body issue
(https://github.com/haskell-servant/servant/issues/3)
* Make code sample in Servant.Server complete

30
servant-server/LICENSE Normal file
View file

@ -0,0 +1,30 @@
Copyright (c) 2014, Zalora South East Asia Pte Ltd
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Zalora South East Asia Pte Ltd nor the names of other
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

20
servant-server/README.md Normal file
View file

@ -0,0 +1,20 @@
# servant-server
[![Build Status](https://secure.travis-ci.org/haskell-servant/servant-server.svg)](http://travis-ci.org/haskell-servant/servant-server)
[![Coverage Status](https://coveralls.io/repos/haskell-servant/servant-server/badge.svg)](https://coveralls.io/r/haskell-servant/servant-server)
![servant](https://raw.githubusercontent.com/haskell-servant/servant/master/servant.png)
This library lets you *implement* an HTTP server with handlers for each endpoint of a servant API, handling most of the boilerplate for you.
## Getting started
We've written a [Getting Started](http://haskell-servant.github.io/getting-started/) guide that introduces the core types and features of servant. After this article, you should be able to write your first servant webservices, learning the rest from the haddocks' examples.
## Repositories and Haddocks
- The core [servant](http://github.com/haskell-servant) package - [docs](http://hackage.haskell.org/package/servant)
- Implementing an HTTP server for a webservice API with [servant-server](http://github.com/haskell-servant/servant-server) - [docs](http://hackage.haskell.org/package/servant-server)
- (Haskell) client-side function generation with [servant-client](http://github.com/haskell-servant/servant-client) - [docs](http://hackage.haskell.org/package/servant-client)
- (Javascript) client-side function generation with [servant-jquery](http://github.com/haskell-servant/servant-jquery) - [docs](http://hackage.haskell.org/package/servant-jquery)
- API docs generation with [servant-docs](http://github.com/haskell-servant/servant-docs) - [docs](http://hackage.haskell.org/package/servant-docs)

2
servant-server/Setup.hs Normal file
View file

@ -0,0 +1,2 @@
import Distribution.Simple
main = defaultMain

15
servant-server/default.nix Normal file
View file

@ -0,0 +1,15 @@
{ pkgs ? import <nixpkgs> { config.allowUnfree = true; }
, src ? builtins.filterSource (path: type:
type != "unknown" &&
baseNameOf path != ".git" &&
baseNameOf path != "result" &&
baseNameOf path != "dist") ./.
, servant ? import ../servant {}
}:
pkgs.haskellPackages.buildLocalCabalWithArgs {
name = "servant-server";
inherit src;
args = {
inherit servant;
};
}

2
servant-server/example/README.md Normal file
View file

@ -0,0 +1,2 @@
- `greet.hs` shows how to write a simple webservice, run it, query it with automatically-derived haskell functions and print the (generated) markdown documentation for the API.
- `greet.md` contains the aforementionned generated documentation.

72
servant-server/example/greet.hs Normal file
View file

@ -0,0 +1,72 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE OverloadedStrings #-}
import Data.Aeson
import Data.Monoid
import Data.Proxy
import Data.Text
import GHC.Generics
import Network.Wai
import Network.Wai.Handler.Warp
import Servant
-- * Example
-- | A greet message data type
newtype Greet = Greet { _msg :: Text }
deriving (Generic, Show)
instance FromJSON Greet
instance ToJSON Greet
-- API specification
type TestApi =
-- GET /hello/:name?capital={true, false} returns a Greet as JSON
"hello" :> Capture "name" Text :> QueryParam "capital" Bool :> Get '[JSON] Greet
-- POST /greet with a Greet as JSON in the request body,
-- returns a Greet as JSON
:<|> "greet" :> ReqBody '[JSON] Greet :> Post '[JSON] Greet
-- DELETE /greet/:greetid
:<|> "greet" :> Capture "greetid" Text :> Delete
testApi :: Proxy TestApi
testApi = Proxy
-- Server-side handlers.
--
-- There's one handler per endpoint, which, just like in the type
-- that represents the API, are glued together using :<|>.
--
-- Each handler runs in the 'EitherT (Int, String) IO' monad.
server :: Server TestApi
server = helloH :<|> postGreetH :<|> deleteGreetH
where helloH name Nothing = helloH name (Just False)
helloH name (Just False) = return . Greet $ "Hello, " <> name
helloH name (Just True) = return . Greet . toUpper $ "Hello, " <> name
postGreetH greet = return greet
deleteGreetH _ = return ()
-- Turn the server into a WAI app. 'serve' is provided by servant,
-- more precisely by the Servant.Server module.
test :: Application
test = serve testApi server
-- Run the server.
--
-- 'run' comes from Network.Wai.Handler.Warp
runTestServer :: Port -> IO ()
runTestServer port = run port test
-- Put this all to work!
main :: IO ()
main = runTestServer 8001

52
servant-server/example/greet.md Normal file
View file

@ -0,0 +1,52 @@
POST /greet
-----------
**Request Body**:
``` javascript
{"msg":"Hello, haskeller!"}
```
**Response**:
- Status code 201
- Response body as below.
``` javascript
{"msg":"Hello, haskeller!"}
```
GET /hello/:name
----------------
**Captures**:
- *name*: name of the person to greet
**GET Parameters**:
- capital
- **Values**: *true, false*
- **Description**: Get the greeting message in uppercase (true) or not (false). Default is false.
**Response**:
- Status code 200
- Response body as below.
``` javascript
{"msg":"Hello, haskeller!"}
```
DELETE /greet/:greetid
----------------------
**Captures**:
- *greetid*: identifier of the greet msg to remove
**Response**:
- Status code 204
- No response body

101
servant-server/servant-server.cabal Normal file
View file

@ -0,0 +1,101 @@
name: servant-server
version: 0.2.4
synopsis: A family of combinators for defining webservices APIs and serving them
description:
A family of combinators for defining webservices APIs and serving them
.
You can learn about the basics in <http://haskell-servant.github.io/getting-started/ the getting started> guide.
.
<https://github.com/haskell-servant/servant-server/blob/master/example/greet.hs Here>'s a runnable example, with comments, that defines a dummy API and
implements a webserver that serves this API, using this package.
homepage: http://haskell-servant.github.io/
Bug-reports: http://github.com/haskell-servant/servant-server/issues
license: BSD3
license-file: LICENSE
author: Alp Mestanogullari, Sönke Hahn, Julian K. Arni
maintainer: alpmestan@gmail.com
copyright: 2014 Zalora South East Asia Pte Ltd
category: Web
build-type: Simple
cabal-version: >=1.10
tested-with: GHC >= 7.8
extra-source-files:
CHANGELOG.md
README.md
source-repository head
type: git
location: http://github.com/haskell-servant/servant-server.git
library
exposed-modules:
Servant
Servant.Server
Servant.Server.Internal
Servant.Utils.StaticFiles
build-depends:
base >= 4.7 && < 5
, aeson >= 0.7 && < 0.9
, attoparsec >= 0.12 && < 0.13
, bytestring >= 0.10 && < 0.11
, either >= 4.3 && < 4.4
, http-types >= 0.8 && < 0.9
, network-uri >= 2.6 && < 2.7
, safe >= 0.3 && < 0.4
, servant >= 0.2 && < 0.4
, split >= 0.2 && < 0.3
, string-conversions >= 0.3 && < 0.4
, system-filepath >= 0.4 && < 0.5
, text >= 1.2 && < 1.3
, transformers >= 0.3 && < 0.5
, wai >= 3.0 && < 3.1
, wai-app-static >= 3.0 && < 3.1
, warp >= 3.0 && < 3.1
hs-source-dirs: src
default-language: Haskell2010
ghc-options: -Wall
executable greet
main-is: greet.hs
hs-source-dirs: example
ghc-options: -Wall
default-language: Haskell2010
build-depends:
base
, servant
, servant-server
, aeson
, warp
, wai
, text
test-suite spec
type: exitcode-stdio-1.0
ghc-options:
-Wall -fno-warn-name-shadowing -fno-warn-missing-signatures
default-language: Haskell2010
hs-source-dirs: test
main-is: Spec.hs
build-depends:
base == 4.*
, aeson
, bytestring
, bytestring-conversion
, directory
, either
, exceptions
, hspec == 2.*
, hspec-wai
, http-types
, network >= 2.6
, QuickCheck
, parsec
, servant
, servant-server
, string-conversions
, temporary
, text
, transformers
, wai
, wai-extra
, warp

22
servant-server/src/Servant.hs Normal file
View file

@ -0,0 +1,22 @@
module Servant (
-- | This module and its submodules can be used to define servant APIs. Note
-- that these API definitions don't directly implement a server (or anything
-- else).
module Servant.API,
-- | For implementing servers for servant APIs.
module Servant.Server,
-- | Using your types in request paths and query string parameters
module Servant.Common.Text,
-- | Utilities on top of the servant core
module Servant.Utils.Links,
module Servant.Utils.StaticFiles,
-- | Useful re-exports
Proxy(..),
) where
import Data.Proxy
import Servant.API
import Servant.Common.Text
import Servant.Server
import Servant.Utils.Links
import Servant.Utils.StaticFiles

49
servant-server/src/Servant/Server.hs Normal file
View file

@ -0,0 +1,49 @@
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
-- | This module lets you implement 'Server's for defined APIs. You'll
-- most likely just need 'serve'.
module Servant.Server
( -- * Run a wai application from an API
serve
, -- * Construct a wai Application from an API
toApplication
, -- * Handlers for all standard combinators
HasServer(..)
, Server
, ServerT
) where
import Data.Proxy (Proxy)
import Network.Wai (Application)
import Servant.API (Canonicalize, canonicalize)
import Servant.Server.Internal
-- * Implementing Servers
-- | 'serve' allows you to implement an API and produce a wai 'Application'.
--
-- Example:
--
-- > type MyApi = "books" :> Get '[JSON] [Book] -- GET /books
-- > :<|> "books" :> ReqBody Book :> Post '[JSON] Book -- POST /books
-- >
-- > server :: Server MyApi
-- > server = listAllBooks :<|> postBook
-- > where listAllBooks = ...
-- > postBook book = ...
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > app :: Application
-- > app = serve myApi server
-- >
-- > main :: IO ()
-- > main = Network.Wai.Handler.Warp.run 8080 app
serve :: HasServer (Canonicalize layout) => Proxy layout -> Server layout -> Application
serve p server = toApplication (route (canonicalize p) server)

866
servant-server/src/Servant/Server/Internal.hs Normal file
View file

@ -0,0 +1,866 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverlappingInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Servant.Server.Internal where
import Control.Applicative ((<$>))
import Control.Monad.Trans.Either (EitherT, runEitherT)
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as BL
import Data.IORef (newIORef, readIORef, writeIORef)
import Data.List (unfoldr)
import Data.Maybe (catMaybes, fromMaybe)
import Data.Monoid (Monoid, mappend, mempty)
import Data.String (fromString)
import Data.String.Conversions (cs, (<>))
import Data.Text (Text)
import qualified Data.Text as T
import Data.Text.Encoding (decodeUtf8, encodeUtf8)
import Data.Typeable
import GHC.TypeLits (KnownSymbol, symbolVal)
import Network.HTTP.Types hiding (Header, ResponseHeaders)
import Network.Wai (Application, Request, Response,
ResponseReceived, lazyRequestBody,
pathInfo, rawQueryString,
requestBody, requestHeaders,
requestMethod, responseLBS,
strictRequestBody)
import Servant.API ((:<|>) (..), (:>), Capture,
Canonicalize, Delete, Get, Header,
MatrixFlag, MatrixParam, MatrixParams,
Patch, Post, Put, QueryFlag,
QueryParam, QueryParams, Raw,
ReqBody)
import Servant.API.ContentTypes (AcceptHeader (..),
AllCTRender (..),
AllCTUnrender (..))
import Servant.API.ResponseHeaders (Headers, getResponse, getHeaders)
import Servant.Common.Text (FromText, fromText)
data ReqBodyState = Uncalled
| Called !B.ByteString
| Done !B.ByteString
toApplication :: RoutingApplication -> Application
toApplication ra request respond = do
reqBodyRef <- newIORef Uncalled
-- We may need to consume the requestBody more than once. In order to
-- maintain the illusion that 'requestBody' works as expected,
-- 'ReqBodyState' is introduced, and the complete body is memoized and
-- returned as many times as requested with empty "Done" marker chunks in
-- between.
-- See https://github.com/haskell-servant/servant/issues/3
let memoReqBody = do
ior <- readIORef reqBodyRef
case ior of
Uncalled -> do
r <- BL.toStrict <$> strictRequestBody request
writeIORef reqBodyRef $ Done r
return r
Called bs -> do
writeIORef reqBodyRef $ Done bs
return bs
Done bs -> do
writeIORef reqBodyRef $ Called bs
return B.empty
ra request{ requestBody = memoReqBody } (routingRespond . routeResult)
where
routingRespond :: Either RouteMismatch Response -> IO ResponseReceived
routingRespond (Left NotFound) =
respond $ responseLBS notFound404 [] "not found"
routingRespond (Left WrongMethod) =
respond $ responseLBS methodNotAllowed405 [] "method not allowed"
routingRespond (Left (InvalidBody err)) =
respond $ responseLBS badRequest400 [] $ fromString $ "invalid request body: " ++ err
routingRespond (Left UnsupportedMediaType) =
respond $ responseLBS unsupportedMediaType415 [] "unsupported media type"
routingRespond (Left (HttpError status body)) =
respond $ responseLBS status [] $ fromMaybe (BL.fromStrict $ statusMessage status) body
routingRespond (Right response) =
respond response
-- Note that the ordering of the constructors has great significance! It
-- determines the Ord instance and, consequently, the monoid instance.
-- * Route mismatch
data RouteMismatch =
NotFound -- ^ the usual "not found" error
| WrongMethod -- ^ a more informative "you just got the HTTP method wrong" error
| UnsupportedMediaType -- ^ request body has unsupported media type
| InvalidBody String -- ^ an even more informative "your json request body wasn't valid" error
| HttpError Status (Maybe BL.ByteString) -- ^ an even even more informative arbitrary HTTP response code error.
deriving (Eq, Ord, Show)
instance Monoid RouteMismatch where
mempty = NotFound
-- The following isn't great, since it picks @InvalidBody@ based on
-- alphabetical ordering, but any choice would be arbitrary.
--
-- "As one judge said to the other, 'Be just and if you can't be just, be
-- arbitrary'" -- William Burroughs
mappend = max
-- | A wrapper around @'Either' 'RouteMismatch' a@.
newtype RouteResult a =
RR { routeResult :: Either RouteMismatch a }
deriving (Eq, Show)
failWith :: RouteMismatch -> RouteResult a
failWith = RR . Left
succeedWith :: a -> RouteResult a
succeedWith = RR . Right
isMismatch :: RouteResult a -> Bool
isMismatch (RR (Left _)) = True
isMismatch _ = False
-- | Like `null . pathInfo`, but works with redundant trailing slashes.
pathIsEmpty :: Request -> Bool
pathIsEmpty = f . processedPathInfo
where
f [] = True
f [""] = True
f _ = False
-- | If we get a `Right`, it has precedence over everything else.
--
-- This in particular means that if we could get several 'Right's,
-- only the first we encounter would be taken into account.
instance Monoid (RouteResult a) where
mempty = RR $ Left mempty
RR (Left x) `mappend` RR (Left y) = RR $ Left (x <> y)
RR (Left _) `mappend` RR (Right y) = RR $ Right y
r `mappend` _ = r
type RoutingApplication =
Request -- ^ the request, the field 'pathInfo' may be modified by url routing
-> (RouteResult Response -> IO ResponseReceived) -> IO ResponseReceived
splitMatrixParameters :: Text -> (Text, Text)
splitMatrixParameters = T.break (== ';')
parsePathInfo :: Request -> [Text]
parsePathInfo = filter (/= "") . mergePairs . map splitMatrixParameters . pathInfo
where mergePairs = concat . unfoldr pairToList
pairToList [] = Nothing
pairToList ((a, b):xs) = Just ([a, b], xs)
-- | Returns a processed pathInfo from the request.
--
-- In order to handle matrix parameters in the request correctly, the raw pathInfo needs to be
-- processed, so routing works as intended. Therefor this function should be used to access
-- the pathInfo for routing purposes.
processedPathInfo :: Request -> [Text]
processedPathInfo r =
case pinfo of
(x:xs) | T.head x == ';' -> xs
_ -> pinfo
where pinfo = parsePathInfo r
class HasServer layout where
type ServerT' layout (m :: * -> *) :: *
route :: Proxy layout -> Server' layout -> RoutingApplication
type Server layout = Server' (Canonicalize layout)
type Server' layout = ServerT' layout (EitherT (Int, String) IO)
type ServerT layout m = ServerT' (Canonicalize layout) m
-- * Instances
-- | A server for @a ':<|>' b@ first tries to match the request against the route
-- represented by @a@ and if it fails tries @b@. You must provide a request
-- handler for each route.
--
-- > type MyApi = "books" :> Get '[JSON] [Book] -- GET /books
-- > :<|> "books" :> ReqBody Book :> Post '[JSON] Book -- POST /books
-- >
-- > server :: Server MyApi
-- > server = listAllBooks :<|> postBook
-- > where listAllBooks = ...
-- > postBook book = ...
instance (HasServer a, HasServer b) => HasServer (a :<|> b) where
type ServerT' (a :<|> b) m = ServerT' a m :<|> ServerT' b m
route Proxy (a :<|> b) request respond =
route pa a request $ \mResponse ->
if isMismatch mResponse
then route pb b request $ \mResponse' -> respond (mResponse <> mResponse')
else respond mResponse
where pa = Proxy :: Proxy a
pb = Proxy :: Proxy b
captured :: FromText a => proxy (Capture sym a) -> Text -> Maybe a
captured _ = fromText
-- | If you use 'Capture' in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of the type specified by the 'Capture'.
-- This lets servant worry about getting it from the URL and turning
-- it into a value of the type you specify.
--
-- You can control how it'll be converted from 'Text' to your type
-- by simply providing an instance of 'FromText' for your type.
--
-- Example:
--
-- > type MyApi = "books" :> Capture "isbn" Text :> Get '[JSON] Book
-- >
-- > server :: Server MyApi
-- > server = getBook
-- > where getBook :: Text -> EitherT (Int, String) IO Book
-- > getBook isbn = ...
instance (KnownSymbol capture, FromText a, HasServer sublayout)
=> HasServer (Capture capture a :> sublayout) where
type ServerT' (Capture capture a :> sublayout) m =
a -> ServerT' sublayout m
route Proxy subserver request respond = case processedPathInfo request of
(first : rest)
-> case captured captureProxy first of
Nothing -> respond $ failWith NotFound
Just v -> route (Proxy :: Proxy sublayout) (subserver v) request{
pathInfo = rest
} respond
_ -> respond $ failWith NotFound
where captureProxy = Proxy :: Proxy (Capture capture a)
-- | If you have a 'Delete' endpoint in your API,
-- the handler for this endpoint is meant to delete
-- a resource.
--
-- The code of the handler will, just like
-- for 'Servant.API.Get.Get', 'Servant.API.Post.Post' and
-- 'Servant.API.Put.Put', run in @EitherT (Int, String) IO ()@.
-- The 'Int' represents the status code and the 'String' a message
-- to be returned. You can use 'Control.Monad.Trans.Either.left' to
-- painlessly error out if the conditions for a successful deletion
-- are not met.
instance HasServer Delete where
type ServerT' Delete m = m ()
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodDelete = do
e <- runEitherT action
respond $ succeedWith $ case e of
Right () ->
responseLBS status204 [] ""
Left (status, message) ->
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodDelete =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- | When implementing the handler for a 'Get' endpoint,
-- just like for 'Servant.API.Delete.Delete', 'Servant.API.Post.Post'
-- and 'Servant.API.Put.Put', the handler code runs in the
-- @EitherT (Int, String) IO@ monad, where the 'Int' represents
-- the status code and the 'String' a message, returned in case of
-- failure. You can quite handily use 'Control.Monad.Trans.EitherT.left'
-- to quickly fail if some conditions are not met.
--
-- If successfully returning a value, we use the type-level list, combined
-- with the request's @Accept@ header, to encode the value for you
-- (returning a status code of 200). If there was no @Accept@ header or it
-- was @*/*@, we return encode using the first @Content-Type@ type on the
-- list.
instance ( AllCTRender ctypes a
) => HasServer (Get ctypes a) where
type ServerT' (Get ctypes a) m = m a
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodGet = do
e <- runEitherT action
respond $ case e of
Right output -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) output of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS ok200 [ ("Content-Type" , cs contentT)] body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodGet =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- '()' ==> 204 No Content
instance HasServer (Get ctypes ()) where
type ServerT' (Get ctypes ()) m = m ()
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodGet = do
e <- runEitherT action
respond . succeedWith $ case e of
Right () -> responseLBS noContent204 [] ""
Left (status, message) ->
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodGet =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- Add response headers
instance ( AllCTRender ctypes v ) => HasServer (Get ctypes (Headers h v)) where
type ServerT' (Get ctypes (Headers h v)) m = m (Headers h v)
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodGet = do
e <- runEitherT action
respond $ case e of
Right output -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
headers = getHeaders output
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) (getResponse output) of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS ok200 ( ("Content-Type" , cs contentT) : headers) body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodGet =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- | If you use 'Header' in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of the type specified by 'Header'.
-- This lets servant worry about extracting it from the request and turning
-- it into a value of the type you specify.
--
-- All it asks is for a 'FromText' instance.
--
-- Example:
--
-- > newtype Referer = Referer Text
-- > deriving (Eq, Show, FromText, ToText)
-- >
-- > -- GET /view-my-referer
-- > type MyApi = "view-my-referer" :> Header "Referer" Referer :> Get '[JSON] Referer
-- >
-- > server :: Server MyApi
-- > server = viewReferer
-- > where viewReferer :: Referer -> EitherT (Int, String) IO referer
-- > viewReferer referer = return referer
instance (KnownSymbol sym, FromText a, HasServer sublayout)
=> HasServer (Header sym a :> sublayout) where
type ServerT' (Header sym a :> sublayout) m =
Maybe a -> ServerT' sublayout m
route Proxy subserver request respond = do
let mheader = fromText . decodeUtf8 =<< lookup str (requestHeaders request)
route (Proxy :: Proxy sublayout) (subserver mheader) request respond
where str = fromString $ symbolVal (Proxy :: Proxy sym)
-- | When implementing the handler for a 'Post' endpoint,
-- just like for 'Servant.API.Delete.Delete', 'Servant.API.Get.Get'
-- and 'Servant.API.Put.Put', the handler code runs in the
-- @EitherT (Int, String) IO@ monad, where the 'Int' represents
-- the status code and the 'String' a message, returned in case of
-- failure. You can quite handily use 'Control.Monad.Trans.EitherT.left'
-- to quickly fail if some conditions are not met.
--
-- If successfully returning a value, we use the type-level list, combined
-- with the request's @Accept@ header, to encode the value for you
-- (returning a status code of 201). If there was no @Accept@ header or it
-- was @*/*@, we return encode using the first @Content-Type@ type on the
-- list.
instance ( AllCTRender ctypes a
) => HasServer (Post ctypes a) where
type ServerT' (Post ctypes a) m = m a
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPost = do
e <- runEitherT action
respond $ case e of
Right output -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) output of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS status201 [ ("Content-Type" , cs contentT)] body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPost =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
instance HasServer (Post ctypes ()) where
type ServerT' (Post ctypes ()) m = m ()
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPost = do
e <- runEitherT action
respond . succeedWith $ case e of
Right () -> responseLBS noContent204 [] ""
Left (status, message) ->
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPost =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- Add response headers
instance ( AllCTRender ctypes v ) => HasServer (Post ctypes (Headers h v)) where
type ServerT' (Post ctypes (Headers h v)) m = m (Headers h v)
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPost = do
e <- runEitherT action
respond $ case e of
Right output -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
headers = getHeaders output
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) (getResponse output) of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS status201 ( ("Content-Type" , cs contentT) : headers) body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPost =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- | When implementing the handler for a 'Put' endpoint,
-- just like for 'Servant.API.Delete.Delete', 'Servant.API.Get.Get'
-- and 'Servant.API.Post.Post', the handler code runs in the
-- @EitherT (Int, String) IO@ monad, where the 'Int' represents
-- the status code and the 'String' a message, returned in case of
-- failure. You can quite handily use 'Control.Monad.Trans.EitherT.left'
-- to quickly fail if some conditions are not met.
--
-- If successfully returning a value, we use the type-level list, combined
-- with the request's @Accept@ header, to encode the value for you
-- (returning a status code of 200). If there was no @Accept@ header or it
-- was @*/*@, we return encode using the first @Content-Type@ type on the
-- list.
instance ( AllCTRender ctypes a
) => HasServer (Put ctypes a) where
type ServerT' (Put ctypes a) m = m a
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPut = do
e <- runEitherT action
respond $ case e of
Right output -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) output of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS status200 [ ("Content-Type" , cs contentT)] body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPut =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
instance HasServer (Put ctypes ()) where
type ServerT' (Put ctypes ()) m = m ()
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPut = do
e <- runEitherT action
respond . succeedWith $ case e of
Right () -> responseLBS noContent204 [] ""
Left (status, message) ->
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPut =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- Add response headers
instance ( AllCTRender ctypes v ) => HasServer (Put ctypes (Headers h v)) where
type ServerT' (Put ctypes (Headers h v)) m = m (Headers h v)
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPut = do
e <- runEitherT action
respond $ case e of
Right output -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
headers = getHeaders output
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) (getResponse output) of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS status200 ( ("Content-Type" , cs contentT) : headers) body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPut =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- | When implementing the handler for a 'Patch' endpoint,
-- just like for 'Servant.API.Delete.Delete', 'Servant.API.Get.Get'
-- and 'Servant.API.Put.Put', the handler code runs in the
-- @EitherT (Int, String) IO@ monad, where the 'Int' represents
-- the status code and the 'String' a message, returned in case of
-- failure. You can quite handily use 'Control.Monad.Trans.EitherT.left'
-- to quickly fail if some conditions are not met.
--
-- If successfully returning a value, we just require that its type has
-- a 'ToJSON' instance and servant takes care of encoding it for you,
-- yielding status code 200 along the way.
instance ( AllCTRender ctypes a
) => HasServer (Patch ctypes a) where
type ServerT' (Patch ctypes a) m = m a
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPatch = do
e <- runEitherT action
respond $ case e of
Right output -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) output of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS status200 [ ("Content-Type" , cs contentT)] body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPatch =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
instance HasServer (Patch ctypes ()) where
type ServerT' (Patch ctypes ()) m = m ()
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPatch = do
e <- runEitherT action
respond . succeedWith $ case e of
Right () -> responseLBS noContent204 [] ""
Left (status, message) ->
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPatch =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- Add response headers
instance ( AllCTRender ctypes v ) => HasServer (Patch ctypes (Headers h v)) where
type ServerT' (Patch ctypes (Headers h v)) m = m (Headers h v)
route Proxy action request respond
| pathIsEmpty request && requestMethod request == methodPatch = do
e <- runEitherT action
respond $ case e of
Right outpatch -> do
let accH = fromMaybe "*/*" $ lookup hAccept $ requestHeaders request
headers = getHeaders outpatch
case handleAcceptH (Proxy :: Proxy ctypes) (AcceptHeader accH) (getResponse outpatch) of
Nothing -> failWith UnsupportedMediaType
Just (contentT, body) -> succeedWith $
responseLBS status200 ( ("Content-Type" , cs contentT) : headers) body
Left (status, message) -> succeedWith $
responseLBS (mkStatus status (cs message)) [] (cs message)
| pathIsEmpty request && requestMethod request /= methodPatch =
respond $ failWith WrongMethod
| otherwise = respond $ failWith NotFound
-- | If you use @'QueryParam' "author" Text@ in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of type @'Maybe' 'Text'@.
--
-- This lets servant worry about looking it up in the query string
-- and turning it into a value of the type you specify, enclosed
-- in 'Maybe', because it may not be there and servant would then
-- hand you 'Nothing'.
--
-- You can control how it'll be converted from 'Text' to your type
-- by simply providing an instance of 'FromText' for your type.
--
-- Example:
--
-- > type MyApi = "books" :> QueryParam "author" Text :> Get '[JSON] [Book]
-- >
-- > server :: Server MyApi
-- > server = getBooksBy
-- > where getBooksBy :: Maybe Text -> EitherT (Int, String) IO [Book]
-- > getBooksBy Nothing = ...return all books...
-- > getBooksBy (Just author) = ...return books by the given author...
instance (KnownSymbol sym, FromText a, HasServer sublayout)
=> HasServer (QueryParam sym a :> sublayout) where
type ServerT' (QueryParam sym a :> sublayout) m =
Maybe a -> ServerT' sublayout m
route Proxy subserver request respond = do
let querytext = parseQueryText $ rawQueryString request
param =
case lookup paramname querytext of
Nothing -> Nothing -- param absent from the query string
Just Nothing -> Nothing -- param present with no value -> Nothing
Just (Just v) -> fromText v -- if present, we try to convert to
-- the right type
route (Proxy :: Proxy sublayout) (subserver param) request respond
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
-- | If you use @'QueryParams' "authors" Text@ in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of type @['Text']@.
--
-- This lets servant worry about looking up 0 or more values in the query string
-- associated to @authors@ and turning each of them into a value of
-- the type you specify.
--
-- You can control how the individual values are converted from 'Text' to your type
-- by simply providing an instance of 'FromText' for your type.
--
-- Example:
--
-- > type MyApi = "books" :> QueryParams "authors" Text :> Get '[JSON] [Book]
-- >
-- > server :: Server MyApi
-- > server = getBooksBy
-- > where getBooksBy :: [Text] -> EitherT (Int, String) IO [Book]
-- > getBooksBy authors = ...return all books by these authors...
instance (KnownSymbol sym, FromText a, HasServer sublayout)
=> HasServer (QueryParams sym a :> sublayout) where
type ServerT' (QueryParams sym a :> sublayout) m =
[a] -> ServerT' sublayout m
route Proxy subserver request respond = do
let querytext = parseQueryText $ rawQueryString request
-- if sym is "foo", we look for query string parameters
-- named "foo" or "foo[]" and call fromText on the
-- corresponding values
parameters = filter looksLikeParam querytext
values = catMaybes $ map (convert . snd) parameters
route (Proxy :: Proxy sublayout) (subserver values) request respond
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
looksLikeParam (name, _) = name == paramname || name == (paramname <> "[]")
convert Nothing = Nothing
convert (Just v) = fromText 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
-- that takes an argument of type 'Bool'.
--
-- Example:
--
-- > type MyApi = "books" :> QueryFlag "published" :> Get '[JSON] [Book]
-- >
-- > server :: Server MyApi
-- > server = getBooks
-- > where getBooks :: Bool -> EitherT (Int, String) IO [Book]
-- > getBooks onlyPublished = ...return all books, or only the ones that are already published, depending on the argument...
instance (KnownSymbol sym, HasServer sublayout)
=> HasServer (QueryFlag sym :> sublayout) where
type ServerT' (QueryFlag sym :> sublayout) m =
Bool -> ServerT' sublayout m
route Proxy subserver request respond = do
let querytext = parseQueryText $ rawQueryString request
param = case lookup paramname querytext of
Just Nothing -> True -- param is there, with no value
Just (Just v) -> examine v -- param with a value
Nothing -> False -- param not in the query string
route (Proxy :: Proxy sublayout) (subserver param) request respond
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
examine v | v == "true" || v == "1" || v == "" = True
| otherwise = False
parseMatrixText :: B.ByteString -> QueryText
parseMatrixText = parseQueryText
-- | If you use @'MatrixParam' "author" Text@ in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of type @'Maybe' 'Text'@.
--
-- This lets servant worry about looking it up in the query string
-- and turning it into a value of the type you specify, enclosed
-- in 'Maybe', because it may not be there and servant would then
-- hand you 'Nothing'.
--
-- You can control how it'll be converted from 'Text' to your type
-- by simply providing an instance of 'FromText' for your type.
--
-- Example:
--
-- > type MyApi = "books" :> MatrixParam "author" Text :> Get [Book]
-- >
-- > server :: Server MyApi
-- > server = getBooksBy
-- > where getBooksBy :: Maybe Text -> EitherT (Int, String) IO [Book]
-- > getBooksBy Nothing = ...return all books...
-- > getBooksBy (Just author) = ...return books by the given author...
instance (KnownSymbol sym, FromText a, HasServer sublayout)
=> HasServer (MatrixParam sym a :> sublayout) where
type ServerT' (MatrixParam sym a :> sublayout) m =
Maybe a -> ServerT' sublayout m
route Proxy subserver request respond = case parsePathInfo request of
(first : _)
-> do let querytext = parseMatrixText . encodeUtf8 $ T.tail first
param = case lookup paramname querytext of
Nothing -> Nothing -- param absent from the query string
Just Nothing -> Nothing -- param present with no value -> Nothing
Just (Just v) -> fromText v -- if present, we try to convert to
-- the right type
route (Proxy :: Proxy sublayout) (subserver param) request respond
_ -> route (Proxy :: Proxy sublayout) (subserver Nothing) request respond
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
-- | If you use @'MatrixParams' "authors" Text@ in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of type @['Text']@.
--
-- This lets servant worry about looking up 0 or more values in the query string
-- associated to @authors@ and turning each of them into a value of
-- the type you specify.
--
-- You can control how the individual values are converted from 'Text' to your type
-- by simply providing an instance of 'FromText' for your type.
--
-- Example:
--
-- > type MyApi = "books" :> MatrixParams "authors" Text :> Get [Book]
-- >
-- > server :: Server MyApi
-- > server = getBooksBy
-- > where getBooksBy :: [Text] -> EitherT (Int, String) IO [Book]
-- > getBooksBy authors = ...return all books by these authors...
instance (KnownSymbol sym, FromText a, HasServer sublayout)
=> HasServer (MatrixParams sym a :> sublayout) where
type ServerT' (MatrixParams sym a :> sublayout) m =
[a] -> ServerT' sublayout m
route Proxy subserver request respond = case parsePathInfo request of
(first : _)
-> do let matrixtext = parseMatrixText . encodeUtf8 $ T.tail first
-- if sym is "foo", we look for matrix parameters
-- named "foo" or "foo[]" and call fromText on the
-- corresponding values
parameters = filter looksLikeParam matrixtext
values = catMaybes $ map (convert . snd) parameters
route (Proxy :: Proxy sublayout) (subserver values) request respond
_ -> route (Proxy :: Proxy sublayout) (subserver []) request respond
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
looksLikeParam (name, _) = name == paramname || name == (paramname <> "[]")
convert Nothing = Nothing
convert (Just v) = fromText v
-- | If you use @'MatrixFlag' "published"@ in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of type 'Bool'.
--
-- Example:
--
-- > type MyApi = "books" :> MatrixFlag "published" :> Get [Book]
-- >
-- > server :: Server MyApi
-- > server = getBooks
-- > where getBooks :: Bool -> EitherT (Int, String) IO [Book]
-- > getBooks onlyPublished = ...return all books, or only the ones that are already published, depending on the argument...
instance (KnownSymbol sym, HasServer sublayout)
=> HasServer (MatrixFlag sym :> sublayout) where
type ServerT' (MatrixFlag sym :> sublayout) m =
Bool -> ServerT' sublayout m
route Proxy subserver request respond = case parsePathInfo request of
(first : _)
-> do let matrixtext = parseMatrixText . encodeUtf8 $ T.tail first
param = case lookup paramname matrixtext of
Just Nothing -> True -- param is there, with no value
Just (Just v) -> examine v -- param with a value
Nothing -> False -- param not in the query string
route (Proxy :: Proxy sublayout) (subserver param) request respond
_ -> route (Proxy :: Proxy sublayout) (subserver False) request respond
where paramname = cs $ symbolVal (Proxy :: Proxy sym)
examine v | v == "true" || v == "1" || v == "" = True
| otherwise = False
-- | Just pass the request to the underlying application and serve its response.
--
-- Example:
--
-- > type MyApi = "images" :> Raw
-- >
-- > server :: Server MyApi
-- > server = serveDirectory "/var/www/images"
instance HasServer Raw where
type ServerT' Raw m = Application
route Proxy rawApplication request respond =
rawApplication request (respond . succeedWith)
-- | If you use 'ReqBody' in one of the endpoints for your API,
-- this automatically requires your server-side handler to be a function
-- that takes an argument of the type specified by 'ReqBody'.
-- The @Content-Type@ header is inspected, and the list provided is used to
-- attempt deserialization. If the request does not have a @Content-Type@
-- header, it is treated as @application/octet-stream@.
-- This lets servant worry about extracting it from the request and turning
-- it into a value of the type you specify.
--
--
-- All it asks is for a 'FromJSON' instance.
--
-- Example:
--
-- > type MyApi = "books" :> ReqBody '[JSON] Book :> Post '[JSON] Book
-- >
-- > server :: Server MyApi
-- > server = postBook
-- > where postBook :: Book -> EitherT (Int, String) IO Book
-- > postBook book = ...insert into your db...
instance ( AllCTUnrender list a, HasServer sublayout
) => HasServer (ReqBody list a :> sublayout) where
type ServerT' (ReqBody list a :> sublayout) m =
a -> ServerT' sublayout m
route Proxy subserver request respond = do
-- See HTTP RFC 2616, section 7.2.1
-- http://www.w3.org/Protocols/rfc2616/rfc2616-sec7.html#sec7.2.1
-- See also "W3C Internet Media Type registration, consistency of use"
-- http://www.w3.org/2001/tag/2002/0129-mime
let contentTypeH = fromMaybe "application/octet-stream"
$ lookup hContentType $ requestHeaders request
mrqbody <- handleCTypeH (Proxy :: Proxy list) (cs contentTypeH)
<$> lazyRequestBody request
case mrqbody of
Nothing -> respond . failWith $ UnsupportedMediaType
Just (Left e) -> respond . failWith $ InvalidBody e
Just (Right v) -> route (Proxy :: Proxy sublayout) (subserver v) request respond
-- | Make sure the incoming request starts with @"/path"@, strip it and
-- pass the rest of the request path to @sublayout@.
instance (KnownSymbol path, HasServer sublayout) => HasServer (path :> sublayout) where
type ServerT' (path :> sublayout) m = ServerT' sublayout m
route Proxy subserver request respond = case processedPathInfo request of
(first : rest)
| first == cs (symbolVal proxyPath)
-> route (Proxy :: Proxy sublayout) subserver request{
pathInfo = rest
} respond
_ -> respond $ failWith NotFound
where proxyPath = Proxy :: Proxy path

36
servant-server/src/Servant/Utils/StaticFiles.hs Normal file
View file

@ -0,0 +1,36 @@
-- | This module defines a sever-side handler that lets you serve static files.
--
-- - 'serveDirectory' lets you serve anything that lives under a particular
-- directory on your filesystem.
module Servant.Utils.StaticFiles (
serveDirectory,
) where
import Filesystem.Path.CurrentOS (decodeString)
import Network.Wai.Application.Static (staticApp, defaultFileServerSettings)
import Servant.API.Raw (Raw)
import Servant.Server (Server)
-- | Serve anything under the specified directory as a 'Raw' endpoint.
--
-- @
-- type MyApi = "static" :> Raw
--
-- server :: Server MyApi
-- server = serveDirectory "\/var\/www"
-- @
--
-- would capture any request to @\/static\/\<something>@ and look for
-- @\<something>@ under @\/var\/www@.
--
-- It will do its best to guess the MIME type for that file, based on the extension,
-- and send an appropriate /Content-Type/ header if possible.
--
-- If your goal is to serve HTML, CSS and Javascript files that use the rest of the API
-- as a webapp backend, you will most likely not want the static files to be hidden
-- behind a /\/static\// prefix. In that case, remember to put the 'serveDirectory'
-- handler in the last position, because /servant/ will try to match the handlers
-- in order.
serveDirectory :: FilePath -> Server Raw
serveDirectory documentRoot =
staticApp (defaultFileServerSettings (decodeString (documentRoot ++ "/")))

619
servant-server/test/Servant/ServerSpec.hs Normal file
View file

@ -0,0 +1,619 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE TypeSynonymInstances #-}
{-# LANGUAGE FlexibleInstances #-}
module Servant.ServerSpec where
import Control.Monad (forM_, when)
import Control.Monad.Trans.Either (EitherT, left)
import Data.Aeson (FromJSON, ToJSON, decode', encode)
import Data.ByteString.Conversion ()
import Data.Char (toUpper)
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)
import Network.HTTP.Types (hAccept, hContentType,
methodDelete, methodGet,
methodPatch, methodPost, methodPut,
ok200, parseQuery, status409)
import Network.Wai (Application, Request, pathInfo,
queryString, rawQueryString,
responseLBS)
import Network.Wai.Test (defaultRequest, request,
runSession, simpleBody)
import Test.Hspec (Spec, describe, it, shouldBe)
import Test.Hspec.Wai (get, liftIO, matchHeaders,
matchStatus, post, request,
shouldRespondWith, with, (<:>))
import Servant.API ((:<|>) (..), (:>),
AddHeader (addHeader), Capture,
Delete, Get, Header (..), Headers,
JSON, MatrixFlag, MatrixParam,
MatrixParams, Patch, PlainText,
Post, Put, QueryFlag, QueryParam,
QueryParams, Raw, ReqBody)
import Servant.Server (Server, serve)
import Servant.Server.Internal (RouteMismatch (..))
-- * 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
-- * specs
spec :: Spec
spec = do
captureSpec
getSpec
postSpec
putSpec
patchSpec
queryParamSpec
matrixParamSpec
headerSpec
rawSpec
unionSpec
errorsSpec
responseHeadersSpec
type CaptureApi = Capture "legs" Integer :> Get '[JSON] Animal
captureApi :: Proxy CaptureApi
captureApi = Proxy
captureServer :: Integer -> EitherT (Int, String) IO Animal
captureServer legs = case legs of
4 -> return jerry
2 -> return tweety
_ -> left (404, "not found")
captureSpec :: Spec
captureSpec = do
describe "Servant.API.Capture" $ do
with (return (serve captureApi captureServer)) $ do
it "can capture parts of the 'pathInfo'" $ do
response <- get "/2"
liftIO $ decode' (simpleBody response) `shouldBe` Just tweety
it "returns 404 if the decoding fails" $ do
get "/notAnInt" `shouldRespondWith` 404
with (return (serve
(Proxy :: Proxy (Capture "captured" String :> Raw))
(\ "captured" request_ respond ->
respond $ responseLBS ok200 [] (cs $ show $ pathInfo request_)))) $ do
it "strips the captured path snippet from pathInfo" $ do
get "/captured/foo" `shouldRespondWith` (fromString (show ["foo" :: String]))
type GetApi = Get '[JSON] Person
:<|> "empty" :> Get '[] ()
getApi :: Proxy GetApi
getApi = Proxy
getSpec :: Spec
getSpec = do
describe "Servant.API.Get" $ do
let server = return alice :<|> return ()
with (return $ serve getApi server) $ do
it "allows to GET a Person" $ do
response <- get "/"
return response `shouldRespondWith` 200
liftIO $ decode' (simpleBody response) `shouldBe` Just alice
it "throws 405 (wrong method) on POSTs" $ do
post "/" "" `shouldRespondWith` 405
post "/empty" "" `shouldRespondWith` 405
it "returns 204 if the type is '()'" $ do
get "empty" `shouldRespondWith` ""{ matchStatus = 204 }
it "returns 415 if the Accept header is not supported" $ do
Test.Hspec.Wai.request methodGet "" [(hAccept, "crazy/mime")] ""
`shouldRespondWith` 415
type QueryParamApi = QueryParam "name" String :> Get '[JSON] Person
:<|> "a" :> QueryParams "names" String :> Get '[JSON] Person
:<|> "b" :> QueryFlag "capitalize" :> Get '[JSON] Person
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) }
queryParamServer (Just name_) = return alice{name = name_}
queryParamServer Nothing = return alice
queryParamSpec :: Spec
queryParamSpec = do
describe "Servant.API.QueryParam" $ do
it "allows to retrieve simple GET parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
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"
}
it "allows to retrieve lists in GET parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
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"
}
it "allows to retrieve value-less GET parameters" $
(flip runSession) (serve queryParamApi qpServer) $ do
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"
}
let params3'' = "?unknown="
response3' <- Network.Wai.Test.request defaultRequest{
rawQueryString = params3'',
queryString = parseQuery params3'',
pathInfo = ["b"]
}
liftIO $
decode' (simpleBody response3') `shouldBe` Just alice{
name = "Alice"
}
type MatrixParamApi = "a" :> MatrixParam "name" String :> Get '[JSON] Person
:<|> "b" :> MatrixParams "names" String :> "bsub" :> MatrixParams "names" String :> Get '[JSON] Person
:<|> "c" :> MatrixFlag "capitalize" :> Get '[JSON] Person
:<|> "d" :> Capture "foo" Integer :> MatrixParam "name" String :> MatrixFlag "capitalize" :> "dsub" :> Get '[JSON] Person
matrixParamApi :: Proxy MatrixParamApi
matrixParamApi = Proxy
mpServer :: Server MatrixParamApi
mpServer = matrixParamServer :<|> mpNames :<|> mpCapitalize alice :<|> mpComplex
where mpNames (_:name2:_) _ = return alice { name = name2 }
mpNames _ _ = return alice
mpCapitalize p False = return p
mpCapitalize p True = return p { name = map toUpper (name p) }
matrixParamServer (Just name) = return alice{name = name}
matrixParamServer Nothing = return alice
mpAge age p = return p { age = age }
mpComplex capture name cap = matrixParamServer name >>= flip mpCapitalize cap >>= mpAge capture
matrixParamSpec :: Spec
matrixParamSpec = do
describe "Servant.API.MatrixParam" $ do
it "allows to retrieve simple matrix parameters" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response1 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["a;name=bob"]
}
liftIO $ do
decode' (simpleBody response1) `shouldBe` Just alice{
name = "bob"
}
it "allows to retrieve lists in matrix parameters" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response2 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["b;names=bob;names=john", "bsub;names=anna;names=sarah"]
}
liftIO $
decode' (simpleBody response2) `shouldBe` Just alice{
name = "john"
}
it "allows to retrieve value-less matrix parameters" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response3 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["c;capitalize"]
}
liftIO $
decode' (simpleBody response3) `shouldBe` Just alice{
name = "ALICE"
}
response3' <- Network.Wai.Test.request defaultRequest{
pathInfo = ["c;capitalize="]
}
liftIO $
decode' (simpleBody response3') `shouldBe` Just alice{
name = "ALICE"
}
it "allows to retrieve matrix parameters on captured segments" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response4 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["d", "12;name=stephen;capitalize", "dsub"]
}
liftIO $
decode' (simpleBody response4) `shouldBe` Just alice{
name = "STEPHEN",
age = 12
}
response4' <- Network.Wai.Test.request defaultRequest{
pathInfo = ["d;ignored=1", "5", "dsub"]
}
liftIO $
decode' (simpleBody response4') `shouldBe` Just alice{
name = "Alice",
age = 5
}
type PostApi =
ReqBody '[JSON] Person :> Post '[JSON] Integer
:<|> "bla" :> ReqBody '[JSON] Person :> Post '[JSON] Integer
:<|> "empty" :> Post '[] ()
postApi :: Proxy PostApi
postApi = Proxy
postSpec :: Spec
postSpec = do
describe "Servant.API.Post and .ReqBody" $ do
let server = return . age :<|> return . age :<|> return ()
with (return $ serve postApi server) $ do
let post' x = Test.Hspec.Wai.request methodPost x [(hContentType
, "application/json;charset=utf-8")]
it "allows to POST a Person" $ do
post' "/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 201
}
it "allows alternative routes if all have request bodies" $ do
post' "/bla" (encode alice) `shouldRespondWith` "42"{
matchStatus = 201
}
it "handles trailing '/' gracefully" $ do
post' "/bla/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 201
}
it "correctly rejects invalid request bodies with status 400" $ do
post' "/" "some invalid body" `shouldRespondWith` 400
it "returns 204 if the type is '()'" $ do
post' "empty" "" `shouldRespondWith` ""{ matchStatus = 204 }
it "responds with 415 if the requested media type is unsupported" $ do
let post'' x = Test.Hspec.Wai.request methodPost x [(hContentType
, "application/nonsense")]
post'' "/" "anything at all" `shouldRespondWith` 415
type PutApi =
ReqBody '[JSON] Person :> Put '[JSON] Integer
:<|> "bla" :> ReqBody '[JSON] Person :> Put '[JSON] Integer
:<|> "empty" :> Put '[] ()
putApi :: Proxy PutApi
putApi = Proxy
putSpec :: Spec
putSpec = do
describe "Servant.API.Put and .ReqBody" $ do
let server = return . age :<|> return . age :<|> return ()
with (return $ serve putApi server) $ do
let put' x = Test.Hspec.Wai.request methodPut x [(hContentType
, "application/json;charset=utf-8")]
it "allows to put a Person" $ do
put' "/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "allows alternative routes if all have request bodies" $ do
put' "/bla" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "handles trailing '/' gracefully" $ do
put' "/bla/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "correctly rejects invalid request bodies with status 400" $ do
put' "/" "some invalid body" `shouldRespondWith` 400
it "returns 204 if the type is '()'" $ do
put' "empty" "" `shouldRespondWith` ""{ matchStatus = 204 }
it "responds with 415 if the requested media type is unsupported" $ do
let put'' x = Test.Hspec.Wai.request methodPut x [(hContentType
, "application/nonsense")]
put'' "/" "anything at all" `shouldRespondWith` 415
type PatchApi =
ReqBody '[JSON] Person :> Patch '[JSON] Integer
:<|> "bla" :> ReqBody '[JSON] Person :> Patch '[JSON] Integer
:<|> "empty" :> Patch '[] ()
patchApi :: Proxy PatchApi
patchApi = Proxy
patchSpec :: Spec
patchSpec = do
describe "Servant.API.Patch and .ReqBody" $ do
let server = return . age :<|> return . age :<|> return ()
with (return $ serve patchApi server) $ do
let patch' x = Test.Hspec.Wai.request methodPatch x [(hContentType
, "application/json;charset=utf-8")]
it "allows to patch a Person" $ do
patch' "/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "allows alternative routes if all have request bodies" $ do
patch' "/bla" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "handles trailing '/' gracefully" $ do
patch' "/bla/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "correctly rejects invalid request bodies with status 400" $ do
patch' "/" "some invalid body" `shouldRespondWith` 400
it "returns 204 if the type is '()'" $ do
patch' "empty" "" `shouldRespondWith` ""{ matchStatus = 204 }
it "responds with 415 if the requested media type is unsupported" $ do
let patch'' x = Test.Hspec.Wai.request methodPatch x [(hContentType
, "application/nonsense")]
patch'' "/" "anything at all" `shouldRespondWith` 415
type HeaderApi a = Header "MyHeader" a :> Delete
headerApi :: Proxy (HeaderApi a)
headerApi = Proxy
headerSpec :: Spec
headerSpec = describe "Servant.API.Header" $ do
let expectsInt :: Maybe Int -> EitherT (Int,String) IO ()
expectsInt (Just x) = when (x /= 5) $ error "Expected 5"
expectsInt Nothing = error "Expected an int"
let expectsString :: Maybe String -> EitherT (Int,String) IO ()
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
let delete' x = Test.Hspec.Wai.request methodDelete x [("MyHeader" ,"5")]
it "passes the header to the handler (Int)" $
delete' "/" "" `shouldRespondWith` 204
with (return (serve headerApi expectsString)) $ do
let delete' x = Test.Hspec.Wai.request methodDelete x [("MyHeader" ,"more from you")]
it "passes the header to the handler (String)" $
delete' "/" "" `shouldRespondWith` 204
type RawApi = "foo" :> Raw
rawApi :: Proxy RawApi
rawApi = Proxy
rawApplication :: Show a => (Request -> a) -> Application
rawApplication f request_ respond = respond $ responseLBS ok200 [] (cs $ show $ f request_)
rawSpec :: Spec
rawSpec = do
describe "Servant.API.Raw" $ do
it "runs applications" $ do
(flip runSession) (serve rawApi (rawApplication (const (42 :: Integer)))) $ do
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
response <- Network.Wai.Test.request defaultRequest{
pathInfo = ["foo", "bar"]
}
liftIO $ do
simpleBody response `shouldBe` cs (show ["bar" :: String])
type AlternativeApi =
"foo" :> Get '[JSON] Person
:<|> "bar" :> Get '[JSON] Animal
:<|> "foo" :> Get '[PlainText] T.Text
:<|> "bar" :> Post '[JSON] Animal
:<|> "bar" :> Put '[JSON] Animal
:<|> "bar" :> Delete
unionApi :: Proxy AlternativeApi
unionApi = Proxy
unionServer :: Server AlternativeApi
unionServer =
return alice
:<|> return jerry
:<|> return "a string"
:<|> return jerry
:<|> return jerry
:<|> return ()
unionSpec :: Spec
unionSpec = do
describe "Servant.API.Alternative" $ do
with (return $ serve unionApi unionServer) $ do
it "unions endpoints" $ do
response <- get "/foo"
liftIO $ do
decode' (simpleBody response) `shouldBe`
Just alice
response_ <- get "/bar"
liftIO $ do
decode' (simpleBody response_) `shouldBe`
Just jerry
it "checks all endpoints before returning 415" $ do
get "/foo" `shouldRespondWith` 200
it "returns 404 if the path does not exist" $ do
get "/nonexistent" `shouldRespondWith` 404
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
let methods = [(methodGet, 200), (methodPost, 201), (methodPut, 200), (methodPatch, 200)]
it "includes the headers in the response" $
forM_ methods $ \(method, expected) ->
Test.Hspec.Wai.request method "/" [] ""
`shouldRespondWith` "\"hi\""{ matchHeaders = ["H1" <:> "5", "H2" <:> "kilroy"]
, matchStatus = expected
}
it "responds with not found for non-existent endpoints" $
forM_ methods $ \(method,_) ->
Test.Hspec.Wai.request method "blahblah" [] ""
`shouldRespondWith` 404
it "returns 415 if the Accept header is not supported" $
forM_ methods $ \(method,_) ->
Test.Hspec.Wai.request method "" [(hAccept, "crazy/mime")] ""
`shouldRespondWith` 415
-- | Test server error functionality.
errorsSpec :: Spec
errorsSpec = do
let he = HttpError status409 (Just "A custom error")
let ib = InvalidBody "The body is invalid"
let wm = WrongMethod
let nf = NotFound
describe "Servant.Server.Internal.RouteMismatch" $ do
it "HttpError > *" $ do
ib <> he `shouldBe` he
wm <> he `shouldBe` he
nf <> he `shouldBe` he
he <> ib `shouldBe` he
he <> wm `shouldBe` he
he <> nf `shouldBe` he
it "HE > InvalidBody > (WM,NF)" $ do
he <> ib `shouldBe` he
wm <> ib `shouldBe` ib
nf <> ib `shouldBe` ib
ib <> he `shouldBe` he
ib <> wm `shouldBe` ib
ib <> nf `shouldBe` ib
it "HE > IB > WrongMethod > NF" $ do
he <> wm `shouldBe` he
ib <> wm `shouldBe` ib
nf <> wm `shouldBe` wm
wm <> he `shouldBe` he
wm <> ib `shouldBe` ib
wm <> nf `shouldBe` wm
it "* > NotFound" $ do
he <> nf `shouldBe` he
ib <> nf `shouldBe` ib
wm <> nf `shouldBe` wm
nf <> he `shouldBe` he
nf <> ib `shouldBe` ib
nf <> wm `shouldBe` wm

65
servant-server/test/Servant/Utils/StaticFilesSpec.hs Normal file
View file

@ -0,0 +1,65 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeOperators #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Servant.Utils.StaticFilesSpec where
import Control.Exception (bracket)
import Data.Proxy (Proxy(Proxy))
import Network.Wai (Application)
import System.Directory (getCurrentDirectory, setCurrentDirectory, createDirectory)
import System.IO.Temp (withSystemTempDirectory)
import Test.Hspec (Spec, describe, it, around_)
import Test.Hspec.Wai (with, get, shouldRespondWith)
import Servant.API (JSON)
import Servant.API.Alternative ((:<|>)((:<|>)))
import Servant.API.Capture (Capture)
import Servant.API.Get (Get)
import Servant.API.Raw (Raw)
import Servant.API.Sub ((:>))
import Servant.Server (Server, serve)
import Servant.ServerSpec (Person(Person))
import Servant.Utils.StaticFiles (serveDirectory)
type Api =
"dummy_api" :> Capture "person_name" String :> Get '[JSON] Person
:<|> "static" :> Raw
api :: Proxy Api
api = Proxy
app :: Application
app = serve api server
server :: Server Api
server =
(\ name_ -> return (Person name_ 42))
:<|> serveDirectory "static"
withStaticFiles :: IO () -> IO ()
withStaticFiles action = withSystemTempDirectory "servant-test" $ \ tmpDir ->
bracket (setup tmpDir) teardown (const action)
where
setup tmpDir = do
outer <- getCurrentDirectory
setCurrentDirectory tmpDir
createDirectory "static"
writeFile "static/foo.txt" "bar"
writeFile "static/index.html" "index"
return outer
teardown outer = do
setCurrentDirectory outer
spec :: Spec
spec = do
around_ withStaticFiles $ with (return app) $ do
describe "serveDirectory" $ do
it "successfully serves files" $ do
get "/static/foo.txt" `shouldRespondWith` "bar"
it "serves the contents of index.html when requesting the root of a directory" $ do
get "/static/" `shouldRespondWith` "index"

1
servant-server/test/Spec.hs Normal file
View file

@ -0,0 +1 @@
{-# OPTIONS_GHC -F -pgmF hspec-discover #-}