git.iko.soy/servant
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servant/src/Servant/API/Post.hs
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1{-# LANGUAGE TypeFamilies #-}
2{-# LANGUAGE OverloadedStrings #-}
3{-# LANGUAGE ScopedTypeVariables #-}
4module Servant.API.Post where
6import Control.Monad
7import Control.Monad.IO.Class
8import Control.Monad.Trans.Either
9import Data.Aeson
10import Data.Proxy
11import Data.String.Conversions
12import Network.HTTP.Types
13import Network.URI
14import Network.Wai
15import Servant.Client
16import Servant.Docs
17import Servant.Server
19import qualified Network.HTTP.Client as Client
21-- | Endpoint for POST requests.
22data Post a
24instance ToJSON a => HasServer (Post a) where
25 type Server (Post a) = EitherT (Int, String) IO a
27 route Proxy action _globalPathInfo request respond
28 | null (pathInfo request) && requestMethod request == methodPost = do
29 e <- runEitherT action
30 respond $ Just $ case e of
31 Right out ->
32 responseLBS status201 [("Content-Type", "application/json")] (encode out)
33 Left (status, message) ->
34 responseLBS (mkStatus status (cs message)) [] (cs message)
35 | otherwise = respond Nothing
37instance FromJSON a => HasClient (Post a) where
38 type Client (Post a) = URI -> EitherT String IO a
40 clientWithRoute Proxy req uri = do
41 partialRequest <- liftIO $ reqToRequest req uri
43 let request = partialRequest { Client.method = methodPost
44 }
46 innerResponse <- liftIO . __withGlobalManager $ \ manager ->
47 Client.httpLbs request manager
49 when (Client.responseStatus innerResponse /= status201) $
50 left ("HTTP POST request failed with status: " ++ show (Client.responseStatus innerResponse))
52 maybe (left "HTTP POST request returned invalid json") return $
53 decode' (Client.responseBody innerResponse)
55instance ToSample a => HasDocs (Post a) where
56 docsFor Proxy (endpoint, action) =
57 single endpoint' action'
59 where endpoint' = endpoint & method .~ DocPOST
61 action' = action & response.respBody .~ toSample p
62 & response.respStatus .~ 201
64 p = Proxy :: Proxy a