@@ -1,16 +1,6 @@
1−{-# LANGUAGE DataKinds #-}
2−{-# LANGUAGE LambdaCase #-}
3−{-# LANGUAGE OverloadedStrings #-}
4−{-# LANGUAGE QuasiQuotes #-}
5−{-# LANGUAGE RecordWildCards #-}
6−{-# LANGUAGE RoleAnnotations #-}
7−{-# LANGUAGE TemplateHaskellQuotes #-}
8−{-# LANGUAGE TypeFamilies #-}
9−{-# LANGUAGE UndecidableInstances #-}
10−
111-- |
122-- Module : Network.HTTP.Req
13−-- Copyright : © 2016–present Mark Karpov
3+-- Copyright : © 2016–2017 Mark Karpov
144-- License : BSD 3 clause
155--
166-- Maintainer : Mark Karpov <markkarpov92@gmail.com>
@@ -19,40 +9,61 @@
199--
2010-- The documentation below is structured in such a way that the most
2111-- important information is presented first: you learn how to do HTTP
22−-- requests, how to embed them in the monad you have, and then it gives you
12+-- requests, how to embed them in any monad you have, and then it gives you
2313-- details about less-common things you may want to know about. The
2414-- documentation is written with sufficient coverage of details and
2515-- examples, and it's designed to be a complete tutorial on its own.
2616--
17+-- /(A modest intro goes here, click on 'req' to start making requests.)/
18+--
2719-- === About the library
2820--
29−-- Req is an HTTP client library that attempts to be easy-to-use, type-safe,
30−-- and expandable.
31−--
32−-- “Easy-to-use” means that the library is designed to be beginner-friendly
33−-- so it's simple to add to your monad stack, intuitive to work with,
34−-- well-documented, and does not get in your way. Doing HTTP requests is a
35−-- common task and a Haskell library for this should be approachable and
36−-- clear to beginners, thus certain compromises were made. For example, one
37−-- cannot currently modify 'L.ManagerSettings' of the default manager
38−-- because the library always uses the same implicit global manager for
39−-- simplicity and maximal connection sharing. There is a way to use your own
40−-- manager with different settings, but it requires more typing.
41−--
42−-- “Type-safe” means that the library tries to eliminate certain classes of
43−-- errors. For example, we have correct-by-construction URLs; it is
44−-- guaranteed that the user does not send the request body when using
45−-- methods like GET or OPTIONS, and the amount of implicit assumptions is
46−-- minimized by making the user specify their intentions in an explicit
47−-- form. For example, it's not possible to avoid specifying the body or the
48−-- method of a request. Authentication methods that assume HTTPS force the
49−-- user to use HTTPS at the type level.
50−--
51−-- “Expandable” refers to the ability to create new components without
52−-- having to resort to hacking. For example, it's possible to define your
53−-- own HTTP methods, create new ways to construct the body of a request,
54−-- create new authorization options, perform a request in a different way,
55−-- and create your own methods to parse a response.
21+-- Req is an easy-to-use, type-safe, expandable, high-level HTTP library
22+-- that just works without any fooling around.
23+--
24+-- What does the phrase “easy-to-use” mean? It means that the library is
25+-- designed to be beginner-friendly so it's simple to add to your monad
26+-- stack, intuitive to work with, well-documented, and does not get in your
27+-- way. Doing HTTP requests is a common task and a Haskell library for this
28+-- should be very approachable and clear to beginners, thus certain
29+-- compromises were made. For example, one cannot currently modify
30+-- 'L.ManagerSettings' of the default manager because the library always
31+-- uses the same implicit global manager for simplicity and maximal
32+-- connection sharing. There is a way to use your own manager with different
33+-- settings, but it requires a bit more typing.
34+--
35+-- “Type-safe” means that the library is protective and eliminates certain
36+-- classes of errors. For example, we have correct-by-construction 'Url's,
37+-- it's guaranteed that the user does not send the request body when using
38+-- methods like 'GET' or 'OPTIONS', and the amount of implicit assumptions
39+-- is minimized by making the user specify his\/her intentions in an
40+-- explicit form (for example, it's not possible to avoid specifying the
41+-- body or method of a request). Authentication methods that assume HTTPS
42+-- force the user to use HTTPS at the type level. The library also carefully
43+-- hides underlying types from the lower-level @http-client@ package because
44+-- those types are not safe enough (for example 'L.Request' is an instance
45+-- of 'Data.String.IsString' and, if it's malformed, it will blow up at
46+-- run-time).
47+--
48+-- “Expandable” refers to the ability of the library to be expanded without
49+-- having to resort to ugly hacking. For example, it's possible to define
50+-- your own HTTP methods, create new ways to construct the body of a
51+-- request, create new authorization options, perform a request in a
52+-- different way, and create your own methods to parse and represent a
53+-- response. As a user extends the library to satisfy his\/her special
54+-- needs, the new solutions will work just like the built-ins. However, all
55+-- of the common cases are also covered by the library out-of-the-box.
56+--
57+-- “High-level” means that there are less details to worry about. The
58+-- library is a result of my experiences as a Haskell consultant. Working
59+-- for several clients, who had very different projects, showed me that the
60+-- library should adapt easily to any particular style of writing Haskell
61+-- applications. For example, some people prefer throwing exceptions, while
62+-- others are concerned with purity. Just define 'handleHttpException'
63+-- accordingly when making your monad instance of 'MonadHttp' and it will
64+-- play together seamlessly. Finally, the library cuts boilerplate down
65+-- considerably, and helps you write concise, easy to read, and maintainable
66+-- code.
5667--
5768-- === Using with other libraries
5869--
@@ -76,207 +87,193 @@
7687-- the whole Haskell ecosystem uses, there is no risk in using @req@. The
7788-- machinery for performing requests is the same as with @http-conduit@ and
7889-- @wreq@. The only difference is the API.
90+
91+{-# LANGUAGE CPP #-}
92+{-# LANGUAGE DataKinds #-}
93+{-# LANGUAGE DeriveDataTypeable #-}
94+{-# LANGUAGE DeriveGeneric #-}
95+{-# LANGUAGE FlexibleInstances #-}
96+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
97+{-# LANGUAGE KindSignatures #-}
98+{-# LANGUAGE MultiParamTypeClasses #-}
99+{-# LANGUAGE OverloadedStrings #-}
100+{-# LANGUAGE RankNTypes #-}
101+{-# LANGUAGE RecordWildCards #-}
102+{-# LANGUAGE ScopedTypeVariables #-}
103+{-# LANGUAGE TypeFamilies #-}
104+
105+#if MIN_VERSION_base(4,9,0)
106+{-# LANGUAGE UndecidableInstances #-}
107+#endif
108+
109+#if __GLASGOW_HASKELL__ < 710
110+{-# LANGUAGE ConstraintKinds #-}
111+#endif
112+
113+#if __GLASGOW_HASKELL__ >= 800
114+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
115+#endif
116+
79117module Network.HTTP.Req
80118 ( -- * Making a request
81119 -- $making-a-request
82− req,
83− reqBr,
84− reqCb,
85− req',
86− withReqManager,
87−
88− -- * Embedding requests in your monad
120+ req
121+ , req'
122+ , withReqManager
123+ -- * Embedding requests into your monad
89124 -- $embedding-requests
90− MonadHttp (..),
91− HttpConfig (..),
92− defaultHttpConfig,
93− Req,
94− runReq,
95−
125+ , MonadHttp (..)
126+ , HttpConfig (..)
127+ , Req
128+ , runReq
96129 -- * Request
97−
98130 -- ** Method
99131 -- $method
100− GET (..),
101− POST (..),
102− HEAD (..),
103− PUT (..),
104− DELETE (..),
105− TRACE (..),
106− CONNECT (..),
107− OPTIONS (..),
108− PATCH (..),
109− HttpMethod (..),
110−
132+ , GET (..)
133+ , POST (..)
134+ , HEAD (..)
135+ , PUT (..)
136+ , DELETE (..)
137+ , TRACE (..)
138+ , CONNECT (..)
139+ , OPTIONS (..)
140+ , PATCH (..)
141+ , HttpMethod (..)
111142 -- ** URL
112143 -- $url
113− Url,
114− http,
115− https,
116− (/~),
117− (/:),
118− useHttpURI,
119− useHttpsURI,
120− useURI,
121− urlQ,
122− renderUrl,
123−
144+ , Url
145+ , http
146+ , https
147+ , (/~)
148+ , (/:)
149+ , parseUrlHttp
150+ , parseUrlHttps
124151 -- ** Body
125152 -- $body
126− NoReqBody (..),
127− ReqBodyJson (..),
128− ReqBodyFile (..),
129− ReqBodyBs (..),
130− ReqBodyLbs (..),
131− ReqBodyUrlEnc (..),
132− FormUrlEncodedParam,
133− ReqBodyMultipart,
134− reqBodyMultipart,
135− HttpBody (..),
136− ProvidesBody,
137− HttpBodyAllowed,
138−
153+ , NoReqBody (..)
154+ , ReqBodyJson (..)
155+ , ReqBodyFile (..)
156+ , ReqBodyBs (..)
157+ , ReqBodyLbs (..)
158+ , ReqBodyUrlEnc (..)
159+ , FormUrlEncodedParam
160+ , ReqBodyMultipart
161+ , reqBodyMultipart
162+ , HttpBody (..)
163+ , ProvidesBody
164+ , HttpBodyAllowed
139165 -- ** Optional parameters
140166 -- $optional-parameters
141− Option,
142−
167+ , Option
143168 -- *** Query parameters
144169 -- $query-parameters
145− (=:),
146− queryFlag,
147− formToQuery,
148− QueryParam (..),
149−
170+ , (=:)
171+ , queryFlag
172+ , QueryParam (..)
150173 -- *** Headers
151− header,
152− attachHeader,
153− headerRedacted,
154−
174+ , header
155175 -- *** Cookies
156176 -- $cookies
157− cookieJar,
158−
177+ , cookieJar
159178 -- *** Authentication
160179 -- $authentication
161− basicAuth,
162− basicAuthUnsafe,
163− basicProxyAuth,
164− oAuth1,
165− oAuth2Bearer,
166− oAuth2Token,
167− customAuth,
168−
180+ , basicAuth
181+ , basicAuthUnsafe
182+ , oAuth1
183+ , oAuth2Bearer
184+ , oAuth2Token
169185 -- *** Other
170− port,
171− decompress,
172− responseTimeout,
173− httpVersion,
174−
186+ , port
187+ , decompress
188+ , responseTimeout
189+ , httpVersion
175190 -- * Response
176−
177191 -- ** Response interpretations
178− IgnoreResponse,
179− ignoreResponse,
180− JsonResponse,
181− jsonResponse,
182− BsResponse,
183− bsResponse,
184− LbsResponse,
185− lbsResponse,
186−
192+ , IgnoreResponse
193+ , ignoreResponse
194+ , JsonResponse
195+ , jsonResponse
196+ , BsResponse
197+ , bsResponse
198+ , LbsResponse
199+ , lbsResponse
200+ , TextResponse
201+ , textResponse
202+ , LTextResponse
203+ , ltextResponse
187204 -- ** Inspecting a response
188− responseBody,
189− responseStatusCode,
190− responseStatusMessage,
191− responseHeader,
192− responseCookieJar,
193−
205+ , responseBody
206+ , responseStatusCode
207+ , responseStatusMessage
208+ , responseHeader
209+ , responseCookieJar
194210 -- ** Defining your own interpretation
195211 -- $new-response-interpretation
196− HttpResponse (..),
197−
212+ , HttpResponse (..)
198213 -- * Other
199− HttpException (..),
200− isStatusCodeException,
201− CanHaveBody (..),
202− Scheme (..),
203− )
214+ , HttpException (..)
215+ , CanHaveBody (..)
216+ , Scheme (..) )
204217where
205218
206−import Blaze.ByteString.Builder qualified as BB
207219import Control.Applicative
208220import Control.Arrow (first, second)
209−import Control.Exception hiding (Handler (..), TypeError)
210−import Control.Monad (guard, void, (>=>))
221+import Control.Exception (Exception, try, handle, throwIO)
222+import Control.Monad
211223import Control.Monad.Base
212−import Control.Monad.Catch (Handler (..), MonadCatch, MonadMask, MonadThrow)
213224import Control.Monad.IO.Class
214−import Control.Monad.IO.Unlift
215−import Control.Monad.Reader (ReaderT (ReaderT), ask, lift, runReaderT)
216−import Control.Monad.Trans.Accum (AccumT)
217−import Control.Monad.Trans.Cont (ContT)
225+import Control.Monad.Reader
218226import Control.Monad.Trans.Control
219−import Control.Monad.Trans.Except (ExceptT)
220−import Control.Monad.Trans.Identity (IdentityT)
221−import Control.Monad.Trans.Maybe (MaybeT)
222−import Control.Monad.Trans.RWS.CPS qualified as RWS.CPS
223−import Control.Monad.Trans.RWS.Lazy qualified as RWS.Lazy
224−import Control.Monad.Trans.RWS.Strict qualified as RWS.Strict
225−import Control.Monad.Trans.Select (SelectT)
226−import Control.Monad.Trans.State.Lazy qualified as State.Lazy
227−import Control.Monad.Trans.State.Strict qualified as State.Strict
228−import Control.Monad.Trans.Writer.CPS qualified as Writer.CPS
229−import Control.Monad.Trans.Writer.Lazy qualified as Writer.Lazy
230−import Control.Monad.Trans.Writer.Strict qualified as Writer.Strict
231227import Control.Retry
232−import Data.Aeson (FromJSON (..), ToJSON (..))
233−import Data.Aeson qualified as A
228+import Data.Aeson (ToJSON (..), FromJSON (..))
234229import Data.ByteString (ByteString)
235−import Data.ByteString qualified as B
236−import Data.ByteString.Lazy qualified as BL
237−import Data.CaseInsensitive qualified as CI
238230import Data.Data (Data)
239−import Data.Default.Class (def)
231+import Data.Default.Class
240232import Data.Function (on)
241233import Data.IORef
242−import Data.Kind (Constraint, Type)
243−import Data.List (foldl', nubBy)
234+import Data.List (nubBy)
244235import Data.List.NonEmpty (NonEmpty (..))
245−import Data.List.NonEmpty qualified as NE
246236import Data.Maybe (fromMaybe)
247237import Data.Proxy
248−import Data.Semigroup (Endo (..))
249−import Data.Set qualified as S
238+import Data.Semigroup hiding (Option, option)
250239import Data.Text (Text)
251−import Data.Text qualified as T
252−import Data.Text.Encoding qualified as T
253−import Data.Typeable (Typeable, cast)
240+import Data.Typeable (Typeable)
254241import GHC.Generics
255242import GHC.TypeLits
256−import Language.Haskell.TH qualified as TH
257−import Language.Haskell.TH.Quote qualified as TH
258−import Language.Haskell.TH.Syntax qualified as TH
259−import Network.Connection qualified as NC
260−import Network.HTTP.Client qualified as L
261−import Network.HTTP.Client.Internal qualified as LI
262−import Network.HTTP.Client.MultipartFormData qualified as LM
263−import Network.HTTP.Client.TLS qualified as L
264−import Network.HTTP.Types qualified as Y
265243import System.IO.Unsafe (unsafePerformIO)
266−import Text.URI (URI)
267−import Text.URI qualified as URI
268−import Text.URI.QQ qualified as QQ
269−import Web.Authenticate.OAuth qualified as OAuth
270−import Web.FormUrlEncoded (FromForm (..), ToForm (..))
271−import Web.FormUrlEncoded qualified as Form
272244import Web.HttpApiData (ToHttpApiData (..))
245+import qualified Blaze.ByteString.Builder as BB
246+import qualified Data.Aeson as A
247+import qualified Data.ByteString as B
248+import qualified Data.ByteString.Lazy as BL
249+import qualified Data.CaseInsensitive as CI
250+import qualified Data.List.NonEmpty as NE
251+import qualified Data.Text as T
252+import qualified Data.Text.Encoding as T
253+import qualified Data.Text.Encoding.Error as TE
254+import qualified Data.Text.Lazy as TL
255+import qualified Data.Text.Lazy.Encoding as TL
256+import qualified Data.Text.Read as TR
257+import qualified Network.Connection as NC
258+import qualified Network.HTTP.Client as L
259+import qualified Network.HTTP.Client.Internal as LI
260+import qualified Network.HTTP.Client.MultipartFormData as LM
261+import qualified Network.HTTP.Client.TLS as L
262+import qualified Network.HTTP.Types as Y
263+import qualified Web.Authenticate.OAuth as OAuth
264+
265+#if MIN_VERSION_base(4,9,0)
266+import Data.Kind (Constraint)
267+#else
268+import GHC.Exts (Constraint)
269+#endif
273270
274271----------------------------------------------------------------------------
275272-- Making a request
276273
277274-- $making-a-request
278275--
279−-- To make an HTTP request you normally need only one function: 'req'.
276+-- To make an HTTP request you need only one function: 'req'.
280277
281278-- | Make an HTTP request. The function takes 5 arguments, 4 of which
282279-- specify required parameters and the final 'Option' argument is a
@@ -293,7 +290,7 @@ import Web.HttpApiData (ToHttpApiData (..))
293290--
294291-- @body@ is a body option such as 'NoReqBody' or 'ReqBodyJson'. The
295292-- tutorial has a section about HTTP bodies, but usage is very
296−-- straightforward and should be clear from the examples.
293+-- straightforward and should be clear from the examples below.
297294--
298295-- @response@ is a type hint how to make and interpret response of an HTTP
299296-- request. Out-of-the-box it can be the following:
@@ -302,6 +299,8 @@ import Web.HttpApiData (ToHttpApiData (..))
302299-- * 'jsonResponse'
303300-- * 'bsResponse' (to get a strict 'ByteString')
304301-- * 'lbsResponse' (to get a lazy 'BL.ByteString')
302+-- * 'textResponse' (to get a strict 'Text', UTF-8 decoded)
303+-- * 'ltextResponse' (to get a lazy 'TL.Text', UTF-8 decoded)
305304--
306305-- Finally, @options@ is a 'Monoid' that holds a composite 'Option' for all
307306-- other optional settings like query parameters, headers, non-standard port
@@ -319,13 +318,12 @@ import Web.HttpApiData (ToHttpApiData (..))
319318-- First, this is a piece of boilerplate that should be in place before you
320319-- try the examples:
321320--
322−-- > {-# LANGUAGE DeriveGeneric #-}
323321-- > {-# LANGUAGE OverloadedStrings #-}
324322-- >
325323-- > module Main (main) where
326324-- >
325+-- > import Control.Exception (throwIO)
327326-- > import Control.Monad
328−-- > import Control.Monad.IO.Class
329327-- > import Data.Aeson
330328-- > import Data.Maybe (fromJust)
331329-- > import Data.Monoid ((<>))
@@ -333,30 +331,32 @@ import Web.HttpApiData (ToHttpApiData (..))
333331-- > import GHC.Generics
334332-- > import Network.HTTP.Req
335333-- > import qualified Data.ByteString.Char8 as B
336−-- > import qualified Text.URI as URI
334+-- >
335+-- > instance MonadHttp IO where
336+-- > handleHttpException = throwIO
337337--
338338-- We will be making requests against the <https://httpbin.org> service.
339339--
340340-- Make a GET request, grab 5 random bytes:
341341--
342342-- > main :: IO ()
343−-- > main = runReq defaultHttpConfig $ do
343+-- > main = do
344344-- > let n :: Int
345345-- > n = 5
346346-- > bs <- req GET (https "httpbin.org" /: "bytes" /~ n) NoReqBody bsResponse mempty
347−-- > liftIO $ B.putStrLn (responseBody bs)
347+-- > B.putStrLn (responseBody bs)
348348--
349349-- The same, but now we use a query parameter named @\"seed\"@ to control
350350-- seed of the generator:
351351--
352352-- > main :: IO ()
353−-- > main = runReq defaultHttpConfig $ do
353+-- > main = do
354354-- > let n, seed :: Int
355355-- > n = 5
356356-- > seed = 100
357357-- > bs <- req GET (https "httpbin.org" /: "bytes" /~ n) NoReqBody bsResponse $
358358-- > "seed" =: seed
359−-- > liftIO $ B.putStrLn (responseBody bs)
359+-- > B.putStrLn (responseBody bs)
360360--
361361-- POST JSON data and get some info about the POST request:
362362--
@@ -369,231 +369,108 @@ import Web.HttpApiData (ToHttpApiData (..))
369369-- > instance FromJSON MyData
370370-- >
371371-- > main :: IO ()
372−-- > main = runReq defaultHttpConfig $ do
372+-- > main = do
373373-- > let myData = MyData
374374-- > { size = 6
375375-- > , color = "Green" }
376376-- > v <- req POST (https "httpbin.org" /: "post") (ReqBodyJson myData) jsonResponse mempty
377−-- > liftIO $ print (responseBody v :: Value)
377+-- > print (responseBody v :: Value)
378378--
379379-- Sending URL-encoded body:
380380--
381381-- > main :: IO ()
382−-- > main = runReq defaultHttpConfig $ do
382+-- > main = do
383383-- > let params =
384384-- > "foo" =: ("bar" :: Text) <>
385385-- > queryFlag "baz"
386386-- > response <- req POST (https "httpbin.org" /: "post") (ReqBodyUrlEnc params) jsonResponse mempty
387−-- > liftIO $ print (responseBody response :: Value)
387+-- > print (responseBody response :: Value)
388388--
389389-- Using various optional parameters and URL that is not known in advance:
390390--
391391-- > main :: IO ()
392−-- > main = runReq defaultHttpConfig $ do
392+-- > main = do
393393-- > -- This is an example of what to do when URL is given dynamically. Of
394394-- > -- course in a real application you may not want to use 'fromJust'.
395−-- > uri <- URI.mkURI "https://httpbin.org/get?foo=bar"
396−-- > let (url, options) = fromJust (useHttpsURI uri)
395+-- > let (url, options) = fromJust (parseUrlHttps "https://httpbin.org/get?foo=bar")
397396-- > response <- req GET url NoReqBody jsonResponse $
398397-- > "from" =: (15 :: Int) <>
399398-- > "to" =: (67 :: Int) <>
400399-- > basicAuth "username" "password" <>
401400-- > options <> -- contains the ?foo=bar part
402401-- > port 443 -- here you can put any port of course
403−-- > liftIO $ print (responseBody response :: Value)
404−req ::
405− ( MonadHttp m,
406− HttpMethod method,
407− HttpBody body,
408− HttpResponse response,
409− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
410− ) =>
411− -- | HTTP method
412− method ->
413− -- | 'Url'—location of resource
414− Url scheme ->
415− -- | Body of the request
416− body ->
417− -- | A hint how to interpret response
418− Proxy response ->
419− -- | Collection of optional parameters
420− Option scheme ->
421− -- | Response
422− m response
423−req method url body responseProxy options =
424− reqCb method url body responseProxy options pure
425−
426−-- | A version of 'req' that does not use one of the predefined instances of
427−-- 'HttpResponse' but instead allows the user to consume @'L.Response'
428−-- 'L.BodyReader'@ manually, in a custom way.
429−--
430−-- @since 1.0.0
431−reqBr ::
432− ( MonadHttp m,
433− HttpMethod method,
434− HttpBody body,
435− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
436− ) =>
437− -- | HTTP method
438− method ->
439− -- | 'Url'—location of resource
440− Url scheme ->
441− -- | Body of the request
442− body ->
443− -- | Collection of optional parameters
444− Option scheme ->
445− -- | How to consume response
446− (L.Response L.BodyReader -> IO a) ->
447− -- | Result
448− m a
449−reqBr method url body options consume =
450− req' method url body options (reqHandler consume)
451−
452−-- | A version of 'req' that takes a callback to modify the 'L.Request', but
453−-- otherwise performs the request identically.
454−--
455−-- @since 3.7.0
456−reqCb ::
457− ( MonadHttp m,
458− HttpMethod method,
459− HttpBody body,
460− HttpResponse response,
461− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
462− ) =>
463− -- | HTTP method
464− method ->
465− -- | 'Url'—location of resource
466− Url scheme ->
467− -- | Body of the request
468− body ->
469− -- | A hint how to interpret response
470− Proxy response ->
471− -- | Collection of optional parameters
472− Option scheme ->
473− -- | Callback to modify the request
474− (L.Request -> m L.Request) ->
475− -- | Response
476− m response
477−reqCb method url body responseProxy options adjustRequest =
478− req' method url body (options <> extraOptions) $ \request manager -> do
479− request' <- adjustRequest request
480− reqHandler getHttpResponse request' manager
481− where
482− extraOptions =
483− case acceptHeader responseProxy of
484− Nothing -> mempty
485− Just accept -> header "Accept" accept
486−
487−-- | The default handler function that the higher-level request functions
488−-- pass to 'req''. Internal function.
489−--
490−-- @since 3.7.0
491−reqHandler ::
492− (MonadHttp m) =>
493− -- | How to get final result from a 'L.Response'
494− (L.Response L.BodyReader -> IO b) ->
495− -- | 'L.Request' to perform
496− L.Request ->
497− -- | 'L.Manager' to use
498− L.Manager ->
499− m b
500−reqHandler consume request manager = do
501− HttpConfig {..} <- getHttpConfig
502− let wrapVanilla = handle (throwIO . VanillaHttpException)
503− wrapExc = handle (throwIO . LI.toHttpException request)
504− withRRef =
505− bracket
506− (newIORef Nothing)
507− (readIORef >=> mapM_ L.responseClose)
508− (liftIO . try . wrapVanilla . wrapExc)
509− ( withRRef $ \rref -> do
510− let openResponse = mask_ $ do
511− r <- readIORef rref
512− mapM_ L.responseClose r
513− r' <- L.responseOpen request manager
514− writeIORef rref (Just r')
515− return r'
516− exceptionRetryPolicies =
517− skipAsyncExceptions
518− ++ [ \retryStatus -> Handler $ \e ->
519− return $ httpConfigRetryJudgeException retryStatus e
520− ]
521− r <-
522− retrying
523− httpConfigRetryPolicy
524− (\retryStatus r -> return $ httpConfigRetryJudge retryStatus r)
525− ( const
526− ( recovering
527− httpConfigRetryPolicy
528− exceptionRetryPolicies
529− (const openResponse)
530− )
531− )
532− (preview, r') <- grabPreview httpConfigBodyPreviewLength r
533− mapM_ LI.throwHttp (httpConfigCheckResponse request r' preview)
534− consume r'
535− )
402+-- > print (responseBody response :: Value)
403+
404+req
405+ :: ( MonadHttp m
406+ , HttpMethod method
407+ , HttpBody body
408+ , HttpResponse response
409+ , HttpBodyAllowed (AllowsBody method) (ProvidesBody body) )
410+ => method -- ^ HTTP method
411+ -> Url scheme -- ^ 'Url'—location of resource
412+ -> body -- ^ Body of the request
413+ -> Proxy response -- ^ A hint how to interpret response
414+ -> Option scheme -- ^ Collection of optional parameters
415+ -> m response -- ^ Response
416+req method url body Proxy options = req' method url body options $ \request manager -> do
417+ HttpConfig {..} <- getHttpConfig
418+ let wrappingVanilla = handle (throwIO . VanillaHttpException)
419+ wrapExc = handle (throwIO . LI.toHttpException request)
420+ (liftIO . try . wrappingVanilla . wrapExc) (do
421+ response <- retrying httpConfigRetryPolicy httpConfigRetryJudge
422+ (const $ getHttpResponse request manager)
423+ httpConfigCheckResponse request response
424+ return response)
536425 >>= either handleHttpException return
537426
538427-- | Mostly like 'req' with respect to its arguments, but accepts a callback
539428-- that allows to perform a request in arbitrary fashion.
540429--
541430-- This function /does not/ perform handling\/wrapping exceptions, checking
542−-- response (with 'httpConfigCheckResponse'), and retrying. It only prepares
543−-- 'L.Request' and allows you to use it.
431+-- response, and retrying. It only prepares 'L.Request' and allows you to
432+-- use it.
544433--
545434-- @since 0.3.0
546−req' ::
547− forall m method body scheme a.
548− ( MonadHttp m,
549− HttpMethod method,
550− HttpBody body,
551− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
552− ) =>
553− -- | HTTP method
554− method ->
555− -- | 'Url'—location of resource
556− Url scheme ->
557− -- | Body of the request
558− body ->
559− -- | Collection of optional parameters
560− Option scheme ->
561− -- | How to perform request
562− (L.Request -> L.Manager -> m a) ->
563− -- | Result
564− m a
435+
436+req'
437+ :: forall m method body scheme a.
438+ ( MonadHttp m
439+ , HttpMethod method
440+ , HttpBody body
441+ , HttpBodyAllowed (AllowsBody method) (ProvidesBody body) )
442+ => method -- ^ HTTP method
443+ -> Url scheme -- ^ 'Url'—location of resource
444+ -> body -- ^ Body of the request
445+ -> Option scheme -- ^ Collection of optional parameters
446+ -> (L.Request -> L.Manager -> m a) -- ^ How to perform request
447+ -> m a
565448req' method url body options m = do
566− config <- getHttpConfig
449+ config@HttpConfig {..} <- getHttpConfig
450+ manager <- liftIO (readIORef globalManager)
567451 let -- NOTE First appearance of any given header wins. This allows to
568452 -- “overwrite” headers when we construct a request by cons-ing.
569453 nubHeaders = Endo $ \x ->
570− x {L.requestHeaders = nubBy ((==) `on` fst) (L.requestHeaders x)}
571− request' =
572− flip appEndo L.defaultRequest $
573− -- NOTE The order of 'mappend's matters, here method is overwritten
574− -- first and 'options' take effect last. In particular, this means
575− -- that 'options' can overwrite things set by other request
576− -- components, which is useful for setting port number,
577− -- "Content-Type" header, etc.
578− nubHeaders
579− <> getRequestMod options
580− <> getRequestMod config
581− <> getRequestMod (Tagged body :: Tagged "body" body)
582− <> getRequestMod url
583− <> getRequestMod (Tagged method :: Tagged "method" method)
454+ x { L.requestHeaders = nubBy ((==) `on` fst) (L.requestHeaders x) }
455+ request' = flip appEndo L.defaultRequest $
456+ -- NOTE The order of 'mappend's matters, here method is overwritten
457+ -- first and 'options' take effect last. In particular, this means
458+ -- that 'options' can overwrite things set by other request
459+ -- components, which is useful for setting port number,
460+ -- "Content-Type" header, etc.
461+ nubHeaders <>
462+ getRequestMod options <>
463+ getRequestMod config <>
464+ getRequestMod (Womb body :: Womb "body" body) <>
465+ getRequestMod url <>
466+ getRequestMod (Womb method :: Womb "method" method)
584467 request <- finalizeRequest options request'
585− withReqManager (m request)
468+ m request manager
586469
587−-- | Perform an action using the global implicit 'L.Manager' that the rest
588−-- of the library uses. This allows us to reuse connections that the
589−-- 'L.Manager' controls.
590−withReqManager :: (MonadIO m) => (L.Manager -> m a) -> m a
591−withReqManager m = m globalManager
592−
593−-- | The global 'L.Manager' that 'req' uses. Here we just go with the
594−-- default settings, so users don't need to deal with this manager stuff at
595−-- all, but when we create a request, instance 'HttpConfig' can affect the
596−-- default settings via 'getHttpConfig'.
470+-- | Global 'L.Manager' that 'req' uses. Here we just go with the default
471+-- settings, so users don't need to deal with this manager stuff at all, but
472+-- when we create a request, instance 'HttpConfig' can affect the default
473+-- settings via 'getHttpConfig'.
597474--
598475-- A note about safety, in case 'unsafePerformIO' looks suspicious to you.
599476-- The value of 'globalManager' is named and lives on top level. This means
@@ -601,20 +478,24 @@ withReqManager m = m globalManager
601478-- manager. From that moment on the 'IORef' will be just reused—exactly the
602479-- behavior we want here in order to maximize connection sharing. GHC could
603480-- spoil the plan by inlining the definition, hence the @NOINLINE@ pragma.
604−globalManager :: L.Manager
481+
482+globalManager :: IORef L.Manager
605483globalManager = unsafePerformIO $ do
606484 context <- NC.initConnectionContext
607− let settings =
608− L.mkManagerSettingsContext
609− (Just context)
610− def
611− Nothing
485+ let settings = L.mkManagerSettingsContext (Just context) def Nothing
612486 manager <- L.newManager settings
613− return manager
487+ newIORef manager
614488{-# NOINLINE globalManager #-}
615489
490+-- | Perform an action using global implicit 'L.Manager' that the rest of
491+-- the library uses. This allows to reuse connections that the 'L.Manager'
492+-- controls.
493+
494+withReqManager :: MonadIO m => (L.Manager -> m a) -> m a
495+withReqManager m = liftIO (readIORef globalManager) >>= m
496+
616497----------------------------------------------------------------------------
617−-- Embedding requests in your monad
498+-- Embedding requests into your monad
618499
619500-- $embedding-requests
620501--
@@ -623,165 +504,110 @@ globalManager = unsafePerformIO $ do
623504--
624505-- When writing a library, keep your API polymorphic in terms of
625506-- 'MonadHttp', only define instance of 'MonadHttp' in final application.
626−-- Another option is to use a @newtype@-wrapped monad stack and define
627−-- 'MonadHttp' for it. As of the version /0.4.0/, the 'Req' monad that
628−-- follows this strategy is provided out-of-the-box (see below).
507+-- Another option is to use @newtype@ wrapped monad stack and define
508+-- 'MonadHttp' for it. As of version /0.4.0/, the 'Req' monad is provided
509+-- for this out-of-the-box.
629510
630511-- | A type class for monads that support performing HTTP requests.
631512-- Typically, you only need to define the 'handleHttpException' method
632513-- unless you want to tweak 'HttpConfig'.
633−class (MonadIO m) => MonadHttp m where
514+
515+class MonadIO m => MonadHttp m where
516+
634517 -- | This method describes how to deal with 'HttpException' that was
635518 -- caught by the library. One option is to re-throw it if you are OK with
636519 -- exceptions, but if you prefer working with something like
637520 -- 'Control.Monad.Except.MonadError', this is the right place to pass it to
638521 -- 'Control.Monad.Except.throwError'.
522+
639523 handleHttpException :: HttpException -> m a
640524
641− -- | Return the 'HttpConfig' to be used when performing HTTP requests.
642− -- Default implementation returns its 'def' value, which is described in
643− -- the documentation for the type. Common usage pattern with manually
644− -- defined 'getHttpConfig' is to return some hard-coded value, or a value
645− -- extracted from 'Control.Monad.Reader.MonadReader' if a more flexible
646− -- approach to configuration is desirable.
525+ -- | Return 'HttpConfig' to be used when performing HTTP requests. Default
526+ -- implementation returns its 'def' value, which is described in the
527+ -- documentation for the type. Common usage pattern with manually defined
528+ -- 'getHttpConfig' is to return some hard-coded value, or value extracted
529+ -- from 'Control.Monad.Reader.MonadReader' if a more flexible approach to
530+ -- configuration is desirable.
531+
647532 getHttpConfig :: m HttpConfig
648− getHttpConfig = return defaultHttpConfig
533+ getHttpConfig = return def
534+
535+-- | 'HttpConfig' contains general and default settings to be used when
536+-- making HTTP requests.
649537
650−-- | 'HttpConfig' contains settings to be used when making HTTP requests.
651538data HttpConfig = HttpConfig
652− { -- | Proxy to use. By default values of @HTTP_PROXY@ and @HTTPS_PROXY@
539+ { httpConfigProxy :: Maybe L.Proxy
540+ -- ^ Proxy to use. By default values of @HTTP_PROXY@ and @HTTPS_PROXY@
653541 -- environment variables are respected, this setting overwrites them.
654542 -- Default value: 'Nothing'.
655− httpConfigProxy :: Maybe L.Proxy,
656− -- | How many redirects to follow when getting a resource. Default
543+ , httpConfigRedirectCount :: Int
544+ -- ^ How many redirects to follow when getting a resource. Default
657545 -- value: 10.
658− httpConfigRedirectCount :: Int,
659− -- | Alternative 'L.Manager' to use. 'Nothing' (default value) means
660− -- that the default implicit manager will be used (that's what you want
661− -- in 99% of cases).
662− httpConfigAltManager :: Maybe L.Manager,
663− -- | Function to check the response immediately after receiving the
664− -- status and headers, before streaming of response body. The third
665− -- argument is the beginning of response body (typically first 1024
666− -- bytes). This is used for throwing exceptions on non-success status
667− -- codes by default (set to @\\_ _ _ -> Nothing@ if this behavior is not
668− -- desirable).
669− --
670− -- When the value this function returns is 'Nothing', nothing will
671− -- happen. When it there is 'L.HttpExceptionContent' inside 'Just', it
672− -- will be thrown.
673− --
674− -- Throwing is better then just returning a request with non-2xx status
675− -- code because in that case something is wrong and we need a way to
676− -- short-cut execution (also remember that Req retries automatically on
677− -- request timeouts and such, so when your request fails, it's certainly
678− -- something exceptional). The thrown exception is caught by the library
679− -- though and is available in 'handleHttpException'.
680− --
681− -- __Note__: signature of this function was changed in the version
682− -- /1.0.0/.
546+ , httpConfigAltManager :: Maybe L.Manager
547+ -- ^ Alternative 'L.Manager' to use. 'Nothing' (default value) means
548+ -- that default implicit manager will be used (that's what you want in
549+ -- 99% of cases).
550+ , httpConfigCheckResponse :: forall r. HttpResponse r => L.Request -> r -> IO ()
551+ -- ^ Function to check the response immediately after receiving the
552+ -- status and headers. This is used for throwing exceptions on
553+ -- non-success status codes by default (set to @\\_ _ -> return ()@ if
554+ -- this behavior is not desirable). Throwing is better then just
555+ -- returning a request with non-2xx status code because in that case
556+ -- something is wrong and we need a way to short-cut execution. The
557+ -- thrown exception is caught by the library though and is available in
558+ -- 'handleHttpException'.
683559 --
684560 -- @since 0.3.0
685− httpConfigCheckResponse ::
686− forall b.
687− L.Request ->
688− L.Response b ->
689− ByteString ->
690− Maybe L.HttpExceptionContent,
691− -- | The retry policy to use for request retrying. By default 'def' is
561+ , httpConfigRetryPolicy :: RetryPolicyM IO
562+ -- ^ The retry policy to use for request retrying. By default 'def' is
692563 -- used (see 'RetryPolicyM').
693564 --
694− -- __Note__: signature of this function was changed to disallow 'IO' in
695− -- version /1.0.0/ and then changed back to its current form in /3.1.0/.
696− --
697565 -- @since 0.3.0
698− httpConfigRetryPolicy :: RetryPolicyM IO,
699− -- | The function is used to decide whether to retry a request. 'True'
566+ , httpConfigRetryJudge :: forall r. HttpResponse r => RetryStatus -> r -> IO Bool
567+ -- ^ The function is used to decide whether to retry a request. 'True'
700568 -- means that the request should be retried.
701569 --
702− -- __Note__: signature of this function was changed in the version
703− -- /1.0.0/.
704− --
705570 -- @since 0.3.0
706− httpConfigRetryJudge :: forall b. RetryStatus -> L.Response b -> Bool,
707− -- | Similar to 'httpConfigRetryJudge', but is used to decide when to
708− -- retry requests that resulted in an exception. By default it retries
709− -- on response timeout and connection timeout (changed in version
710− -- /3.8.0/).
711− --
712− -- @since 3.4.0
713− httpConfigRetryJudgeException :: RetryStatus -> SomeException -> Bool,
714− -- | Max length of preview fragment of response body.
715− --
716− -- @since 3.6.0
717− httpConfigBodyPreviewLength :: forall a. (Num a) => a
718− }
719−
720−-- | The default value of 'HttpConfig'.
721−--
722−-- @since 2.0.0
723−defaultHttpConfig :: HttpConfig
724−defaultHttpConfig =
725− HttpConfig
726− { httpConfigProxy = Nothing,
727− httpConfigRedirectCount = 10,
728− httpConfigAltManager = Nothing,
729− httpConfigCheckResponse = \_ response preview ->
730− let scode = statusCode response
731− in if 200 <= scode && scode < 300
732− then Nothing
733− else Just (L.StatusCodeException (void response) preview),
734− httpConfigRetryPolicy = retryPolicyDefault,
735− httpConfigRetryJudge = \_ response ->
736− statusCode response
737− `elem` [ 408, -- Request timeout
738− 504, -- Gateway timeout
739− 524, -- A timeout occurred
740− 598, -- (Informal convention) Network read timeout error
741− 599 -- (Informal convention) Network connect timeout error
742− ],
743− httpConfigRetryJudgeException = \_ e ->
744− case fromException e of
745− Just (L.HttpExceptionRequest _ c) ->
746− case c of
747− L.ResponseTimeout -> True
748− L.ConnectionTimeout -> True
749− _ -> False
750− _ -> False,
751− httpConfigBodyPreviewLength = 1024
571+ } deriving Typeable
572+
573+instance Default HttpConfig where
574+ def = HttpConfig
575+ { httpConfigProxy = Nothing
576+ , httpConfigRedirectCount = 10
577+ , httpConfigAltManager = Nothing
578+ , httpConfigCheckResponse = \_ response ->
579+ let statusCode = responseStatusCode response in
580+ unless (200 <= statusCode && statusCode < 300) $
581+ let chunk = makeResponseBodyPreview response
582+ vresponse = toVanillaResponse response
583+ in LI.throwHttp (L.StatusCodeException (void vresponse) chunk)
584+ , httpConfigRetryPolicy = def
585+ , httpConfigRetryJudge = \_ r -> return $
586+ responseStatusCode r `elem`
587+ [ 408 -- Request timeout
588+ , 504 -- Gateway timeout
589+ , 524 -- A timeout occurred
590+ , 598 -- (Informal convention) Network read timeout error
591+ , 599 -- (Informal convention) Network connect timeout error
592+ ]
752593 }
753− where
754− statusCode = Y.statusCode . L.responseStatus
755594
756595instance RequestComponent HttpConfig where
757596 getRequestMod HttpConfig {..} = Endo $ \x ->
758− x
759− { L.proxy = httpConfigProxy,
760− L.redirectCount = httpConfigRedirectCount,
761− LI.requestManagerOverride = httpConfigAltManager
762− }
597+ x { L.proxy = httpConfigProxy
598+ , L.redirectCount = httpConfigRedirectCount
599+ , LI.requestManagerOverride = httpConfigAltManager }
763600
764−-- | A monad that allows us to run 'req' in any 'IO'-enabled monad without
601+-- | A monad that allows to run 'req' in any 'IO'-enabled monad without
765602-- having to define new instances.
766603--
767604-- @since 0.4.0
768−newtype Req a = Req (ReaderT HttpConfig IO a)
769− deriving
770− ( Functor,
771− Applicative,
772− Monad,
773− MonadIO,
774− MonadUnliftIO
775− )
776−
777−-- | @since 3.7.0
778−deriving instance MonadThrow Req
779−
780−-- | @since 3.7.0
781−deriving instance MonadCatch Req
782605
783−-- | @since 3.7.0
784−deriving instance MonadMask Req
606+newtype Req a = Req (ReaderT HttpConfig IO a)
607+ deriving ( Functor
608+ , Applicative
609+ , Monad
610+ , MonadIO )
785611
786612instance MonadBase IO Req where
787613 liftBase = liftIO
@@ -790,99 +616,22 @@ instance MonadBaseControl IO Req where
790616 type StM Req a = a
791617 liftBaseWith f = Req . ReaderT $ \r -> f (runReq r)
792618 {-# INLINEABLE liftBaseWith #-}
793− restoreM = Req . ReaderT . const . return
619+ restoreM = Req . ReaderT . const . return
794620 {-# INLINEABLE restoreM #-}
795621
796622instance MonadHttp Req where
797623 handleHttpException = Req . lift . throwIO
798− getHttpConfig = Req ask
799−
800−-- | @since 3.10.0
801−instance (MonadHttp m, Monoid w) => MonadHttp (AccumT w m) where
802− handleHttpException = lift . handleHttpException
803− getHttpConfig = lift getHttpConfig
804−
805−-- | @since 3.10.0
806−instance (MonadHttp m) => MonadHttp (ContT r m) where
807− handleHttpException = lift . handleHttpException
808− getHttpConfig = lift getHttpConfig
809−
810−-- | @since 3.10.0
811−instance (MonadHttp m) => MonadHttp (ExceptT e m) where
812− handleHttpException = lift . handleHttpException
813− getHttpConfig = lift getHttpConfig
814−
815−-- | @since 3.10.0
816−instance (MonadHttp m) => MonadHttp (IdentityT m) where
817− handleHttpException = lift . handleHttpException
818− getHttpConfig = lift getHttpConfig
819−
820−-- | @since 3.10.0
821−instance (MonadHttp m) => MonadHttp (MaybeT m) where
822− handleHttpException = lift . handleHttpException
823− getHttpConfig = lift getHttpConfig
824−
825−-- | @since 3.10.0
826−instance (MonadHttp m) => MonadHttp (ReaderT r m) where
827− handleHttpException = lift . handleHttpException
828− getHttpConfig = lift getHttpConfig
829−
830−-- | @since 3.10.0
831−instance (MonadHttp m, Monoid w) => MonadHttp (RWS.CPS.RWST r w s m) where
832− handleHttpException = lift . handleHttpException
833− getHttpConfig = lift getHttpConfig
834−
835−-- | @since 3.10.0
836−instance (MonadHttp m, Monoid w) => MonadHttp (RWS.Lazy.RWST r w s m) where
837− handleHttpException = lift . handleHttpException
838− getHttpConfig = lift getHttpConfig
839−
840−-- | @since 3.10.0
841−instance (MonadHttp m, Monoid w) => MonadHttp (RWS.Strict.RWST r w s m) where
842− handleHttpException = lift . handleHttpException
843− getHttpConfig = lift getHttpConfig
844−
845−-- | @since 3.10.0
846−instance (MonadHttp m) => MonadHttp (SelectT r m) where
847− handleHttpException = lift . handleHttpException
848− getHttpConfig = lift getHttpConfig
849−
850−-- | @since 3.10.0
851−instance (MonadHttp m) => MonadHttp (State.Lazy.StateT s m) where
852− handleHttpException = lift . handleHttpException
853− getHttpConfig = lift getHttpConfig
854−
855−-- | @since 3.10.0
856−instance (MonadHttp m) => MonadHttp (State.Strict.StateT s m) where
857− handleHttpException = lift . handleHttpException
858− getHttpConfig = lift getHttpConfig
859−
860−-- | @since 3.10.0
861−instance (MonadHttp m, Monoid w) => MonadHttp (Writer.CPS.WriterT w m) where
862− handleHttpException = lift . handleHttpException
863− getHttpConfig = lift getHttpConfig
864−
865−-- | @since 3.10.0
866−instance (MonadHttp m, Monoid w) => MonadHttp (Writer.Lazy.WriterT w m) where
867− handleHttpException = lift . handleHttpException
868− getHttpConfig = lift getHttpConfig
869−
870−-- | @since 3.10.0
871−instance (MonadHttp m, Monoid w) => MonadHttp (Writer.Strict.WriterT w m) where
872− handleHttpException = lift . handleHttpException
873− getHttpConfig = lift getHttpConfig
624+ getHttpConfig = Req ask
874625
875626-- | Run a computation in the 'Req' monad with the given 'HttpConfig'. In
876−-- the case of an exceptional situation an 'HttpException' will be thrown.
627+-- case of exceptional situation an 'HttpException' will be thrown.
877628--
878629-- @since 0.4.0
879−runReq ::
880− (MonadIO m) =>
881− -- | 'HttpConfig' to use
882− HttpConfig ->
883− -- | Computation to run
884− Req a ->
885− m a
630+
631+runReq :: MonadIO m
632+ => HttpConfig -- ^ 'HttpConfig' to use
633+ -> Req a -- ^ Computation to run
634+ -> m a
886635runReq config (Req m) = liftIO (runReaderT m config)
887636
888637----------------------------------------------------------------------------
@@ -898,6 +647,7 @@ runReq config (Req m) = liftIO (runReaderT m config)
898647-- define a new method that will works seamlessly, see 'HttpMethod'.
899648
900649-- | 'GET' method.
650+
901651data GET = GET
902652
903653instance HttpMethod GET where
@@ -905,6 +655,7 @@ instance HttpMethod GET where
905655 httpMethodName Proxy = Y.methodGet
906656
907657-- | 'POST' method.
658+
908659data POST = POST
909660
910661instance HttpMethod POST where
@@ -912,6 +663,7 @@ instance HttpMethod POST where
912663 httpMethodName Proxy = Y.methodPost
913664
914665-- | 'HEAD' method.
666+
915667data HEAD = HEAD
916668
917669instance HttpMethod HEAD where
@@ -919,24 +671,26 @@ instance HttpMethod HEAD where
919671 httpMethodName Proxy = Y.methodHead
920672
921673-- | 'PUT' method.
674+
922675data PUT = PUT
923676
924677instance HttpMethod PUT where
925678 type AllowsBody PUT = 'CanHaveBody
926679 httpMethodName Proxy = Y.methodPut
927680
928−-- | 'DELETE' method. RFC 7231 allows a payload in DELETE but without
929−-- semantics.
930−--
931−-- __Note__: before version /3.4.0/ this method did not allow request
932−-- bodies.
681+-- | 'DELETE' method. This data type does not allow having request body with
682+-- 'DELETE' requests, as it should be. However some APIs may expect 'DELETE'
683+-- requests to have bodies, in that case define your own variation of
684+-- 'DELETE' method and allow it to have a body.
685+
933686data DELETE = DELETE
934687
935688instance HttpMethod DELETE where
936− type AllowsBody DELETE = 'CanHaveBody
689+ type AllowsBody DELETE = 'NoBody
937690 httpMethodName Proxy = Y.methodDelete
938691
939692-- | 'TRACE' method.
693+
940694data TRACE = TRACE
941695
942696instance HttpMethod TRACE where
@@ -944,6 +698,7 @@ instance HttpMethod TRACE where
944698 httpMethodName Proxy = Y.methodTrace
945699
946700-- | 'CONNECT' method.
701+
947702data CONNECT = CONNECT
948703
949704instance HttpMethod CONNECT where
@@ -951,6 +706,7 @@ instance HttpMethod CONNECT where
951706 httpMethodName Proxy = Y.methodConnect
952707
953708-- | 'OPTIONS' method.
709+
954710data OPTIONS = OPTIONS
955711
956712instance HttpMethod OPTIONS where
@@ -958,6 +714,7 @@ instance HttpMethod OPTIONS where
958714 httpMethodName Proxy = Y.methodOptions
959715
960716-- | 'PATCH' method.
717+
961718data PATCH = PATCH
962719
963720instance HttpMethod PATCH where
@@ -965,26 +722,30 @@ instance HttpMethod PATCH where
965722 httpMethodName Proxy = Y.methodPatch
966723
967724-- | A type class for types that can be used as an HTTP method. To define a
968−-- non-standard method, follow this example that defines @COPY@:
725+-- non-standard method, follow this example that defines COPY:
969726--
970727-- > data COPY = COPY
971728-- >
972729-- > instance HttpMethod COPY where
973730-- > type AllowsBody COPY = 'CanHaveBody
974731-- > httpMethodName Proxy = "COPY"
732+
975733class HttpMethod a where
734+
976735 -- | Type function 'AllowsBody' returns a type of kind 'CanHaveBody' which
977− -- tells the rest of the library whether the method can have body or not.
978− -- We use the special type 'CanHaveBody' lifted to the kind level instead
979− -- of 'Bool' to get more user-friendly compiler messages.
736+ -- tells the rest of the library whether the method can have a body or
737+ -- not. We use the special type 'CanHaveBody' “lifted” to kind level
738+ -- instead of 'Bool' to get more user-friendly compiler messages.
739+
980740 type AllowsBody a :: CanHaveBody
981741
982742 -- | Return name of the method as a 'ByteString'.
743+
983744 httpMethodName :: Proxy a -> ByteString
984745
985−instance (HttpMethod method) => RequestComponent (Tagged "method" method) where
746+instance HttpMethod method => RequestComponent (Womb "method" method) where
986747 getRequestMod _ = Endo $ \x ->
987− x {L.method = httpMethodName (Proxy :: Proxy method)}
748+ x { L.method = httpMethodName (Proxy :: Proxy method) }
988749
989750----------------------------------------------------------------------------
990751-- Request—URL
@@ -992,7 +753,7 @@ instance (HttpMethod method) => RequestComponent (Tagged "method" method) where
992753-- $url
993754--
994755-- We use 'Url's which are correct by construction, see 'Url'. To build a
995−-- 'Url' from a 'URI', use 'useHttpURI', 'useHttpsURI', or generic 'useURI'.
756+-- 'Url' from a 'ByteString', use 'parseUrlHttp' or 'parseUrlHttps'.
996757
997758-- | Request's 'Url'. Start constructing your 'Url' with 'http' or 'https'
998759-- specifying the scheme and host at the same time. Then use the @('/~')@
@@ -1022,194 +783,91 @@ instance (HttpMethod method) => RequestComponent (Tagged "method" method) where
1022783--
1023784-- > https "юникод.рф"
1024785-- > -- https://%D1%8E%D0%BD%D0%B8%D0%BA%D0%BE%D0%B4.%D1%80%D1%84
786+
1025787data Url (scheme :: Scheme) = Url Scheme (NonEmpty Text)
1026788 -- NOTE The second value is the path segments in reversed order.
1027− deriving (Eq, Ord, Show, Data, Generic)
1028−
1029−type role Url nominal
1030−
1031−-- With template-haskell >=2.15 and text >=1.2.4 Lift can be derived, however
1032−-- the derived lift forgets the type of the scheme.
1033−instance (Typeable scheme) => TH.Lift (Url scheme) where
1034− lift url =
1035− TH.dataToExpQ (fmap liftText . cast) url `TH.sigE` case url of
1036− Url Http _ -> [t|Url 'Http|]
1037− Url Https _ -> [t|Url 'Https|]
1038− where
1039− liftText t = TH.AppE (TH.VarE 'T.pack) <$> TH.lift (T.unpack t)
1040− liftTyped = TH.Code . TH.unsafeTExpCoerce . TH.lift
1041−
1042−-- | Given host name, produce a 'Url' which has “http” as its scheme and
789+ deriving (Eq, Ord, Show, Data, Typeable, Generic)
790+
791+-- | Given host name, produce a 'Url' which have “http” as its scheme and
1043792-- empty path. This also sets port to @80@.
793+
1044794http :: Text -> Url 'Http
1045795http = Url Http . pure
1046796
1047−-- | Given host name, produce a 'Url' which has “https” as its scheme and
797+-- | Given host name, produce a 'Url' which have “https” as its scheme and
1048798-- empty path. This also sets port to @443@.
799+
1049800https :: Text -> Url 'Https
1050801https = Url Https . pure
1051802
1052−-- | Grow a given 'Url' appending a single path segment to it. Note that the
803+-- | Grow given 'Url' appending a single path segment to it. Note that the
1053804-- path segment can be of any type that is an instance of 'ToHttpApiData'.
1054−infixl 5 /~
1055805
1056−(/~) :: (ToHttpApiData a) => Url scheme -> a -> Url scheme
806+infixl 5 /~
807+(/~) :: ToHttpApiData a => Url scheme -> a -> Url scheme
1057808Url secure path /~ segment = Url secure (NE.cons (toUrlPiece segment) path)
1058809
1059−-- | A type-constrained version of @('/~')@ to remove ambiguity in the cases
1060−-- when next URL piece is a 'Data.Text.Text' literal.
1061−infixl 5 /:
810+-- | Type-constrained version of @('/~')@ to remove ambiguity in the cases
811+-- when next URL piece is a 'Text' literal.
1062812
813+infixl 5 /:
1063814(/:) :: Url scheme -> Text -> Url scheme
1064815(/:) = (/~)
1065816
1066−-- | Render a 'Url' as 'Text'.
1067−--
1068−-- @since 3.4.0
1069−renderUrl :: Url scheme -> Text
1070−renderUrl = \case
1071− Url Https parts ->
1072− "https://" <> renderParts parts
1073− Url Http parts ->
1074− "http://" <> renderParts parts
1075− where
1076− renderParts parts =
1077− T.intercalate "/" (reverse $ NE.toList parts)
1078−
1079−-- | The 'useHttpURI' function provides an alternative method to get 'Url'
1080−-- (possibly with some 'Option's) from a 'URI'. This is useful when you are
1081−-- given a URL to query dynamically and don't know it beforehand.
1082−--
1083−-- This function expects the scheme to be “http” and host to be present.
1084−--
1085−-- @since 3.0.0
1086−useHttpURI :: URI -> Maybe (Url 'Http, Option scheme)
1087−useHttpURI uri = do
1088− guard (URI.uriScheme uri == Just [QQ.scheme|http|])
1089− urlHead <- http <$> uriHost uri
1090− let url = case URI.uriPath uri of
1091− Nothing -> urlHead
1092− Just uriPath -> uriPathToUrl uriPath urlHead
1093− return (url, uriOptions uri)
1094−
1095−-- | Just like 'useHttpURI', but expects the “https” scheme.
1096−--
1097−-- @since 3.0.0
1098−useHttpsURI :: URI -> Maybe (Url 'Https, Option scheme)
1099−useHttpsURI uri = do
1100− guard (URI.uriScheme uri == Just [QQ.scheme|https|])
1101− urlHead <- https <$> uriHost uri
1102− let url = case URI.uriPath uri of
1103− Nothing -> urlHead
1104− Just uriPath -> uriPathToUrl uriPath urlHead
1105− return (url, uriOptions uri)
1106−
1107−-- | Convert URI path to a 'Url'. Internal.
1108−--
1109−-- @since 3.9.0
1110−uriPathToUrl ::
1111− (Bool, NonEmpty (URI.RText 'URI.PathPiece)) ->
1112− Url scheme ->
1113− Url scheme
1114−uriPathToUrl (trailingSlash, xs) urlHead =
1115− if trailingSlash then path /: T.empty else path
1116− where
1117− path = foldl' (/:) urlHead (URI.unRText <$> NE.toList xs)
1118−
1119−-- | A combination of 'useHttpURI' and 'useHttpsURI' for cases when scheme
1120−-- is not known in advance.
1121−--
1122−-- @since 3.0.0
1123−useURI ::
1124− URI ->
1125− Maybe
1126− ( Either
1127− (Url 'Http, Option scheme0)
1128− (Url 'Https, Option scheme1)
1129− )
1130−useURI uri =
1131− (Left <$> useHttpURI uri) <|> (Right <$> useHttpsURI uri)
1132−
1133−-- | An internal helper function to extract host from a 'URI'.
1134−uriHost :: URI -> Maybe Text
1135−uriHost uri = case URI.uriAuthority uri of
1136− Left _ -> Nothing
1137− Right URI.Authority {..} ->
1138− Just (URI.unRText authHost)
1139−
1140−-- | A quasiquoter to build an 'Url' and 'Option' tuple. The type of the
1141−-- generated expression is @('Url' scheme0, 'Option' scheme1)@ with
1142−-- @scheme0@ being either 'Http' or 'Https' depending on the input.
1143−--
1144−-- @since 3.2.0
1145−urlQ :: TH.QuasiQuoter
1146−urlQ =
1147− TH.QuasiQuoter
1148− { quoteExp = \str ->
1149− case URI.mkURI (T.pack str) of
1150− Left err -> fail (displayException err)
1151− Right uri -> case useURI uri of
1152− Nothing -> fail "Not a HTTP or HTTPS URL"
1153− Just eurl ->
1154− TH.tupE
1155− [ either (TH.lift . fst) (TH.lift . fst) eurl,
1156− [|uriOptions uri|]
1157− ],
1158− quotePat = error "This usage is not supported",
1159− quoteType = error "This usage is not supported",
1160− quoteDec = error "This usage is not supported"
1161− }
1162−
1163−-- | An internal helper function to extract 'Option's from a 'URI'.
1164−uriOptions :: forall scheme. URI -> Option scheme
1165−uriOptions uri =
1166− mconcat
1167− [ auth,
1168− query,
1169− port'
1170− -- , fragment'
1171− ]
1172− where
1173− (auth, port') =
1174− case URI.uriAuthority uri of
1175− Left _ -> (mempty, mempty)
1176− Right URI.Authority {..} ->
1177− let auth0 = case authUserInfo of
1178− Nothing -> mempty
1179− Just URI.UserInfo {..} ->
1180− let username = T.encodeUtf8 (URI.unRText uiUsername)
1181− password = maybe "" (T.encodeUtf8 . URI.unRText) uiPassword
1182− in basicAuthUnsafe username password
1183− port0 = case authPort of
1184− Nothing -> mempty
1185− Just port'' -> port (fromIntegral port'')
1186− in (auth0, port0)
1187− query =
1188− let liftQueryParam = \case
1189− URI.QueryFlag t -> queryFlag (URI.unRText t)
1190− URI.QueryParam k v -> URI.unRText k =: URI.unRText v
1191− in mconcat (liftQueryParam <$> URI.uriQuery uri)
1192−
1193−-- TODO Blocked on upstream: https://github.com/snoyberg/http-client/issues/424
1194−-- fragment' =
1195−-- case URI.uriFragment uri of
1196−-- Nothing -> mempty
1197−-- Just fragment'' -> fragment (URI.unRText fragment'')
817+-- | The 'parseUrlHttp' function provides an alternative method to get 'Url'
818+-- (possibly with some 'Option's) from a 'ByteString'. This is useful when
819+-- you are given a URL to query dynamically and don't know it beforehand.
820+-- The function parses 'ByteString' because it's the correct type to
821+-- represent a URL, as 'Url' cannot contain characters outside of ASCII
822+-- range, thus we can consider every character a 'Data.Word.Word8' value.
823+--
824+-- This function only parses 'Url' (scheme, host, path) and optional query
825+-- parameters that are returned as 'Option'. It does not parse method name
826+-- or authentication info from given 'ByteString'.
827+
828+parseUrlHttp :: ByteString -> Maybe (Url 'Http, Option scheme)
829+parseUrlHttp url' = do
830+ url <- B.stripPrefix "http://" url'
831+ (host :| path, option) <- parseUrlHelper url
832+ return (foldl (/:) (http host) path, option)
833+
834+-- | Just like 'parseUrlHttp', but expects “https” scheme.
835+
836+parseUrlHttps :: ByteString -> Maybe (Url 'Https, Option scheme)
837+parseUrlHttps url' = do
838+ url <- B.stripPrefix "https://" url'
839+ (host :| path, option) <- parseUrlHelper url
840+ return (foldl (/:) (https host) path, option)
841+
842+-- | Get host\/collection of path pieces and possibly query parameters
843+-- already converted to 'Option'. This function is not public.
844+
845+parseUrlHelper :: ByteString -> Maybe (NonEmpty Text, Option scheme)
846+parseUrlHelper url = do
847+ let (path', query') = B.break (== 0x3f) url
848+ query = mconcat (uncurry queryParam <$> Y.parseQueryText query')
849+ p' :| ps <- NE.nonEmpty (Y.decodePathSegments path')
850+ (p, port') <-
851+ case T.break (== ':') p' of
852+ (x, "") -> return (x, mempty)
853+ (x, prt) ->
854+ case TR.decimal (T.drop 1 prt) of
855+ Right (prt',"") -> return (x, port prt')
856+ _ -> Nothing
857+ return (p :| ps, query <> port')
1198858
1199859instance RequestComponent (Url scheme) where
1200860 getRequestMod (Url scheme segments) = Endo $ \x ->
1201− let (host :| path) = NE.reverse segments
1202− in x
1203− { L.secure = case scheme of
1204− Http -> False
1205− Https -> True,
1206− L.port = case scheme of
1207− Http -> 80
1208− Https -> 443,
1209− L.host = Y.urlEncode False (T.encodeUtf8 host),
1210− L.path =
1211− (BL.toStrict . BB.toLazyByteString . Y.encodePathSegments) path
1212− }
861+ let (host :| path) = NE.reverse segments in
862+ x { L.secure = case scheme of
863+ Http -> False
864+ Https -> True
865+ , L.port = case scheme of
866+ Http -> 80
867+ Https -> 443
868+ , L.host = Y.urlEncode False (T.encodeUtf8 host)
869+ , L.path =
870+ (BL.toStrict . BB.toLazyByteString . Y.encodePathSegments) path }
1213871
1214872----------------------------------------------------------------------------
1215873-- Request—Body
@@ -1218,37 +876,39 @@ instance RequestComponent (Url scheme) where
1218876--
1219877-- A number of options for request bodies are available. The @Content-Type@
1220878-- header is set for you automatically according to the body option you use
1221−-- (it's always specified in the documentation for a given body option). To
1222−-- add your own way to represent request body, define an instance of
1223−-- 'HttpBody'.
879+-- (it's always specified in documentation for a given body option). To add
880+-- your own way to represent request body, see 'HttpBody'.
1224881
1225882-- | This data type represents empty body of an HTTP request. This is the
1226883-- data type to use with 'HttpMethod's that cannot have a body, as it's the
1227884-- only type for which 'ProvidesBody' returns 'NoBody'.
1228885--
1229886-- Using of this body option does not set the @Content-Type@ header.
887+
1230888data NoReqBody = NoReqBody
1231889
1232890instance HttpBody NoReqBody where
1233891 getRequestBody NoReqBody = L.RequestBodyBS B.empty
1234892
1235−-- | This body option allows us to use a JSON object as the request
1236−-- body—probably the most popular format right now. Just wrap a data type
1237−-- that is an instance of 'ToJSON' type class and you are done: it will be
1238−-- converted to JSON and inserted as request body.
893+-- | This body option allows to use a JSON object as request body—probably
894+-- the most popular format right now. Just wrap a data type that is an
895+-- instance of 'ToJSON' type class and you are done: it will be converted to
896+-- JSON and inserted as request body.
1239897--
1240898-- This body option sets the @Content-Type@ header to @\"application/json;
1241899-- charset=utf-8\"@ value.
900+
1242901newtype ReqBodyJson a = ReqBodyJson a
1243902
1244−instance (ToJSON a) => HttpBody (ReqBodyJson a) where
903+instance ToJSON a => HttpBody (ReqBodyJson a) where
1245904 getRequestBody (ReqBodyJson a) = L.RequestBodyLBS (A.encode a)
1246905 getRequestContentType _ = pure "application/json; charset=utf-8"
1247906
1248907-- | This body option streams request body from a file. It is expected that
1249−-- the file size does not change during streaming.
908+-- the file size does not change during the streaming.
1250909--
1251910-- Using of this body option does not set the @Content-Type@ header.
911+
1252912newtype ReqBodyFile = ReqBodyFile FilePath
1253913
1254914instance HttpBody ReqBodyFile where
@@ -1258,6 +918,7 @@ instance HttpBody ReqBodyFile where
1258918-- | HTTP request body represented by a strict 'ByteString'.
1259919--
1260920-- Using of this body option does not set the @Content-Type@ header.
921+
1261922newtype ReqBodyBs = ReqBodyBs ByteString
1262923
1263924instance HttpBody ReqBodyBs where
@@ -1266,19 +927,22 @@ instance HttpBody ReqBodyBs where
1266927-- | HTTP request body represented by a lazy 'BL.ByteString'.
1267928--
1268929-- Using of this body option does not set the @Content-Type@ header.
930+
1269931newtype ReqBodyLbs = ReqBodyLbs BL.ByteString
1270932
1271933instance HttpBody ReqBodyLbs where
1272934 getRequestBody (ReqBodyLbs bs) = L.RequestBodyLBS bs
1273935
1274−-- | URL-encoded body. This can hold a collection of parameters which are
1275−-- encoded similarly to query parameters at the end of query string, with
1276−-- the only difference that they are stored in request body. The similarity
1277−-- is reflected in the API as well, as you can use the same combinators you
1278−-- would use to add query parameters: @('=:')@ and 'queryFlag'.
936+-- | Form URL-encoded body. This can hold a collection of parameters which
937+-- are encoded similarly to query parameters at the end of query string,
938+-- with the only difference that they are stored in request body. The
939+-- similarity is reflected in the API as well, as you can use the same
940+-- combinators you would use to add query parameters: @('=:')@ and
941+-- 'queryFlag'.
1279942--
1280943-- This body option sets the @Content-Type@ header to
1281944-- @\"application/x-www-form-urlencoded\"@ value.
945+
1282946newtype ReqBodyUrlEnc = ReqBodyUrlEnc FormUrlEncodedParam
1283947
1284948instance HttpBody ReqBodyUrlEnc where
@@ -1288,37 +952,33 @@ instance HttpBody ReqBodyUrlEnc where
1288952
1289953-- | An opaque monoidal value that allows to collect URL-encoded parameters
1290954-- to be wrapped in 'ReqBodyUrlEnc'.
955+
1291956newtype FormUrlEncodedParam = FormUrlEncodedParam [(Text, Maybe Text)]
1292957 deriving (Semigroup, Monoid)
1293958
1294959instance QueryParam FormUrlEncodedParam where
1295960 queryParam name mvalue =
1296961 FormUrlEncodedParam [(name, toQueryParam <$> mvalue)]
1297− queryParamToList (FormUrlEncodedParam p) = p
1298−
1299−-- | Use 'formToQuery'.
1300−--
1301−-- @since 3.11.0
1302−instance FromForm FormUrlEncodedParam where
1303− fromForm = Right . formToQuery
1304962
1305963-- | Multipart form data. Please consult the
1306964-- "Network.HTTP.Client.MultipartFormData" module for how to construct
1307965-- parts, then use 'reqBodyMultipart' to create actual request body from the
1308−-- parts. 'reqBodyMultipart' is the only way to get a value of the type
966+-- parts. 'reqBodyMultipart' is the only way to get a value of type
1309967-- 'ReqBodyMultipart', as its constructor is not exported on purpose.
1310968--
1311969-- @since 0.2.0
1312970--
1313−-- ==== __Examples__
971+-- ==== __Example__
1314972--
1315−-- > import Control.Monad.IO.Class
1316−-- > import Data.Default.Class
1317−-- > import Network.HTTP.Req
973+-- > import Control.Exception (throwIO)
1318974-- > import qualified Network.HTTP.Client.MultipartFormData as LM
975+-- > import Network.HTTP.Req
976+-- >
977+-- > instance MonadHttp IO where
978+-- > handleHttpException = throwIO
1319979-- >
1320980-- > main :: IO ()
1321−-- > main = runReq def $ do
981+-- > main = do
1322982-- > body <-
1323983-- > reqBodyMultipart
1324984-- > [ LM.partBS "title" "My Image"
@@ -1329,7 +989,8 @@ instance FromForm FormUrlEncodedParam where
1329989-- > body
1330990-- > bsResponse
1331991-- > mempty
1332−-- > liftIO $ print (responseBody response)
992+-- > print $ responseBody response
993+
1333994data ReqBodyMultipart = ReqBodyMultipart ByteString LI.RequestBody
1334995
1335996instance HttpBody ReqBodyMultipart where
@@ -1340,117 +1001,126 @@ instance HttpBody ReqBodyMultipart where
13401001-- | Create 'ReqBodyMultipart' request body from a collection of 'LM.Part's.
13411002--
13421003-- @since 0.2.0
1343−reqBodyMultipart :: (MonadIO m) => [LM.Part] -> m ReqBodyMultipart
1004+
1005+reqBodyMultipart :: MonadIO m => [LM.Part] -> m ReqBodyMultipart
13441006reqBodyMultipart parts = liftIO $ do
13451007 boundary <- LM.webkitBoundary
1346− body <- LM.renderParts boundary parts
1008+ body <- LM.renderParts boundary parts
13471009 return (ReqBodyMultipart boundary body)
13481010
13491011-- | A type class for things that can be interpreted as an HTTP
13501012-- 'L.RequestBody'.
1013+
13511014class HttpBody body where
1015+
1016+ {-# MINIMAL getRequestBody #-}
1017+
13521018 -- | How to get actual 'L.RequestBody'.
1019+
13531020 getRequestBody :: body -> L.RequestBody
13541021
1355− -- | This method allows us to optionally specify the value of
1356− -- @Content-Type@ header that should be used with particular body option.
1357− -- By default it returns 'Nothing' and so @Content-Type@ is not set.
1022+ -- | This method allows to optionally specify value of @Content-Type@
1023+ -- header that should be used with particular body option. By default it
1024+ -- returns 'Nothing' and so @Content-Type@ is not set.
1025+
13581026 getRequestContentType :: body -> Maybe ByteString
13591027 getRequestContentType = const Nothing
13601028
13611029-- | The type function recognizes 'NoReqBody' as having 'NoBody', while any
1362−-- other body option 'CanHaveBody'. This forces the user to use 'NoReqBody'
1363−-- with 'GET' method and other methods that should not have body.
1030+-- other body option 'CanHaveBody'. This forces user to use 'NoReqBody' with
1031+-- 'GET' method and other methods that should not send a body.
1032+
13641033type family ProvidesBody body :: CanHaveBody where
13651034 ProvidesBody NoReqBody = 'NoBody
1366− ProvidesBody body = 'CanHaveBody
1035+ ProvidesBody body = 'CanHaveBody
13671036
13681037-- | This type function allows any HTTP body if method says it
13691038-- 'CanHaveBody'. When the method says it should have 'NoBody', the only
13701039-- body option to use is 'NoReqBody'.
1371−type family
1372− HttpBodyAllowed
1373− (allowsBody :: CanHaveBody)
1374− (providesBody :: CanHaveBody) ::
1375− Constraint
1376− where
1377− HttpBodyAllowed 'NoBody 'NoBody = ()
1378− HttpBodyAllowed 'CanHaveBody body = ()
1379− HttpBodyAllowed 'NoBody 'CanHaveBody =
1380− TypeError
1381− ('Text "This HTTP method does not allow attaching a request body.")
1382−
1383−instance (HttpBody body) => RequestComponent (Tagged "body" body) where
1384− getRequestMod (Tagged body) = Endo $ \x ->
1385− x
1386− { L.requestBody = getRequestBody body,
1387− L.requestHeaders =
1388− let old = L.requestHeaders x
1389− in case getRequestContentType body of
1390− Nothing -> old
1391− Just contentType ->
1392− (Y.hContentType, contentType) : old
1393− }
1040+--
1041+-- __Note__: users of GHC 8.0.1 and later will see a slightly more friendly
1042+-- error message when method does not allow a body and body is provided.
1043+
1044+type family HttpBodyAllowed
1045+ (allowsBody :: CanHaveBody)
1046+ (providesBody :: CanHaveBody) :: Constraint where
1047+ HttpBodyAllowed 'NoBody 'NoBody = ()
1048+ HttpBodyAllowed 'CanHaveBody body = ()
1049+#if MIN_VERSION_base(4,9,0)
1050+ HttpBodyAllowed 'NoBody 'CanHaveBody = TypeError
1051+ ('Text "This HTTP method does not allow attaching a request body.")
1052+#endif
1053+
1054+instance HttpBody body => RequestComponent (Womb "body" body) where
1055+ getRequestMod (Womb body) = Endo $ \x ->
1056+ x { L.requestBody = getRequestBody body
1057+ , L.requestHeaders =
1058+ let old = L.requestHeaders x in
1059+ case getRequestContentType body of
1060+ Nothing -> old
1061+ Just contentType ->
1062+ (Y.hContentType, contentType) : old }
13941063
13951064----------------------------------------------------------------------------
13961065-- Request—Optional parameters
13971066
13981067-- $optional-parameters
13991068--
1400−-- Optional parameters of request include things like query parameters,
1069+-- Optional parameters to a request include things like query parameters,
14011070-- headers, port number, etc. All optional parameters have the type
14021071-- 'Option', which is a 'Monoid'. This means that you can use 'mempty' as
14031072-- the last argument of 'req' to specify no optional parameters, or combine
1404−-- 'Option's using 'mappend' or @('<>')@ to have several of them at once.
1073+-- 'Option's using 'mappend' (or @('<>')@) to have several of them at once.
14051074
1406−-- | The opaque 'Option' type is a 'Monoid' you can use to pack collection
1407−-- of optional parameters like query parameters and headers. See sections
1408−-- below to learn which 'Option' primitives are available.
1409−data Option (scheme :: Scheme)
1410− = Option (Endo (Y.QueryText, L.Request)) (Maybe (L.Request -> IO L.Request))
1075+-- | Opaque 'Option' type is a 'Monoid' you can use to pack collection of
1076+-- optional parameters like query parameters and headers. See sections below
1077+-- to learn which 'Option' primitives are available.
14111078
1412−-- NOTE 'QueryText' is just [(Text, Maybe Text)], we keep it along with
1413−-- Request to avoid appending to an existing query string in request every
1414−-- time new parameter is added. The additional Maybe (L.Request -> IO
1415−-- L.Request) is a finalizer that will be applied after all other
1416−-- transformations. This is for authentication methods that sign requests
1417−-- based on data in Request.
1079+data Option (scheme :: Scheme) =
1080+ Option (Endo (Y.QueryText, L.Request)) (Maybe (L.Request -> IO L.Request))
1081+ -- NOTE 'QueryText' is just [(Text, Maybe Text)], we keep it along with
1082+ -- Request to avoid appending to existing query string in request every
1083+ -- time new parameter is added. Additional Maybe (L.Request -> IO
1084+ -- L.Request) is a finalizer that will be applied after all other
1085+ -- transformations. This is for authentication methods that sign requests
1086+ -- based on data in Request.
14181087
14191088instance Semigroup (Option scheme) where
1420− Option er0 mr0 <> Option er1 mr1 =
1421− Option
1422− (er0 <> er1)
1423− (mr0 <|> mr1)
1089+ Option er0 mr0 <> Option er1 mr1 = Option
1090+ (er0 <> er1) (mr0 <|> mr1)
14241091
14251092instance Monoid (Option scheme) where
1426− mempty = Option mempty Nothing
1093+ mempty = Option mempty Nothing
14271094 mappend = (<>)
14281095
1429−-- | Use 'formToQuery'.
1430−--
1431−-- @since 3.11.0
1432−instance FromForm (Option scheme) where
1433− fromForm = Right . formToQuery
1434−
14351096-- | A helper to create an 'Option' that modifies only collection of query
14361097-- parameters. This helper is not a part of the public API.
1098+
14371099withQueryParams :: (Y.QueryText -> Y.QueryText) -> Option scheme
14381100withQueryParams f = Option (Endo (first f)) Nothing
14391101
14401102-- | A helper to create an 'Option' that modifies only 'L.Request'. This
14411103-- helper is not a part of public API.
1104+
14421105withRequest :: (L.Request -> L.Request) -> Option scheme
14431106withRequest f = Option (Endo (second f)) Nothing
14441107
1108+-- | A helper to create an 'Option' that adds a finalizer (request
1109+-- transformation that is applied after all other modifications).
1110+
1111+asFinalizer :: (L.Request -> IO L.Request) -> Option scheme
1112+asFinalizer = Option mempty . pure
1113+
14451114instance RequestComponent (Option scheme) where
14461115 getRequestMod (Option f _) = Endo $ \x ->
14471116 let (qparams, x') = appEndo f ([], x)
1448− query = Y.renderQuery True (Y.queryTextToQuery qparams)
1449− in x' {L.queryString = query}
1117+ query = Y.renderQuery True (Y.queryTextToQuery qparams)
1118+ in x' { L.queryString = query }
14501119
14511120-- | Finalize given 'L.Request' by applying a finalizer from the given
14521121-- 'Option' (if it has any).
1453−finalizeRequest :: (MonadIO m) => Option scheme -> L.Request -> m L.Request
1122+
1123+finalizeRequest :: MonadIO m => Option scheme -> L.Request -> m L.Request
14541124finalizeRequest (Option _ mfinalizer) = liftIO . fromMaybe pure mfinalizer
14551125
14561126----------------------------------------------------------------------------
@@ -1463,67 +1133,47 @@ finalizeRequest (Option _ mfinalizer) = liftIO . fromMaybe pure mfinalizer
14631133-- bodies (of the type 'FormUrlEncodedParam').
14641134
14651135-- | This operator builds a query parameter that will be included in URL of
1466−-- your request after the question sign @?@. This is the same syntax you use
1136+-- your request after question sign @?@. This is the same syntax you use
14671137-- with form URL encoded request bodies.
14681138--
14691139-- This operator is defined in terms of 'queryParam':
14701140--
14711141-- > name =: value = queryParam name (pure value)
1472−infix 7 =:
14731142
1143+infix 7 =:
14741144(=:) :: (QueryParam param, ToHttpApiData a) => Text -> a -> param
14751145name =: value = queryParam name (pure value)
14761146
1477−-- | Construct a flag, that is, a valueless query parameter. For example, in
1478−-- the following URL @\"a\"@ is a flag, while @\"b\"@ is a query parameter
1479−-- with a value:
1147+-- | Construct a flag, that is, valueless query parameter. For example, in
1148+-- the following URL @a@ is a flag, while @b@ is a query parameter with a
1149+-- value:
14801150--
14811151-- > https://httpbin.org/foo/bar?a&b=10
14821152--
14831153-- This operator is defined in terms of 'queryParam':
14841154--
14851155-- > queryFlag name = queryParam name (Nothing :: Maybe ())
1486−queryFlag :: (QueryParam param) => Text -> param
1487−queryFlag name = queryParam name (Nothing :: Maybe ())
14881156
1489−-- | Construct query parameters from a 'ToForm' instance. This function
1490−-- produces the same query params as 'Form.urlEncodeAsFormStable'.
1491−--
1492−-- Note that 'Form.Form' doesn't have the concept of parameters with the
1493−-- empty value (i.e. what you can get by @key =: ""@). If the value is
1494−-- empty, it will be encoded as a valueless parameter (i.e. what you can get
1495−-- by @queryFlag key@).
1496−--
1497−-- @since 3.11.0
1498−formToQuery :: (QueryParam param, Monoid param, ToForm f) => f -> param
1499−formToQuery f = mconcat . fmap toParam . Form.toListStable $ toForm f
1500− where
1501− toParam (key, val) =
1502− queryParam key $
1503− if val == ""
1504− then Nothing
1505− else Just val
1157+queryFlag :: QueryParam param => Text -> param
1158+queryFlag name = queryParam name (Nothing :: Maybe ())
15061159
15071160-- | A type class for query-parameter-like things. The reason to have an
15081161-- overloaded 'queryParam' is to be able to use it as an 'Option' and as a
15091162-- 'FormUrlEncodedParam' when constructing form URL encoded request bodies.
15101163-- Having the same syntax for these cases seems natural and user-friendly.
1164+
15111165class QueryParam param where
1166+
15121167 -- | Create a query parameter with given name and value. If value is
15131168 -- 'Nothing', it won't be included at all (i.e. you create a flag this
15141169 -- way). It's recommended to use @('=:')@ and 'queryFlag' instead of this
15151170 -- method, because they are easier to read.
1516− queryParam :: (ToHttpApiData a) => Text -> Maybe a -> param
15171171
1518− -- | Get the query parameter names and values set by 'queryParam'.
1519− --
1520− -- @since 3.11.0
1521− queryParamToList :: param -> [(Text, Maybe Text)]
1172+ queryParam :: ToHttpApiData a => Text -> Maybe a -> param
15221173
15231174instance QueryParam (Option scheme) where
15241175 queryParam name mvalue =
15251176 withQueryParams ((:) (name, toQueryParam <$> mvalue))
1526− queryParamToList (Option f _) = fst $ appEndo f ([], L.defaultRequest)
15271177
15281178----------------------------------------------------------------------------
15291179-- Request—Optional parameters—Headers
@@ -1532,28 +1182,19 @@ instance QueryParam (Option scheme) where
15321182-- headers with the same names the leftmost header will win. This means, in
15331183-- particular, that you cannot create a request with several headers of the
15341184-- same name.
1535−header ::
1536− -- | Header name
1537− ByteString ->
1538− -- | Header value
1539− ByteString ->
1540− Option scheme
1185+
1186+header
1187+ :: ByteString -- ^ Header name
1188+ -> ByteString -- ^ Header value
1189+ -> Option scheme
15411190header name value = withRequest (attachHeader name value)
15421191
1543−-- | Attach a header with given name and content to a 'L.Request'.
1544−--
1545−-- @since 1.1.0
1192+-- | A non-public helper that attaches a header with given name and content
1193+-- to a 'L.Request'.
1194+
15461195attachHeader :: ByteString -> ByteString -> L.Request -> L.Request
15471196attachHeader name value x =
1548− x {L.requestHeaders = (CI.mk name, value) : L.requestHeaders x}
1549−
1550−-- | Same as 'header', but with redacted values on print.
1551−--
1552−-- @since 3.13.0
1553−headerRedacted :: ByteString -> ByteString -> Option scheme
1554−headerRedacted name value = withRequest $ \x ->
1555− let y = attachHeader name value x
1556− in y {L.redactHeaders = CI.mk name `S.insert` L.redactHeaders y}
1197+ x { L.requestHeaders = (CI.mk name, value) : L.requestHeaders x }
15571198
15581199----------------------------------------------------------------------------
15591200-- Request—Optional parameters—Cookies
@@ -1566,9 +1207,10 @@ headerRedacted name value = withRequest $ \x ->
15661207
15671208-- | Use the given 'L.CookieJar'. A 'L.CookieJar' can be obtained from a
15681209-- 'L.Response' record.
1210+
15691211cookieJar :: L.CookieJar -> Option scheme
15701212cookieJar jar = withRequest $ \x ->
1571− x {L.cookieJar = Just jar}
1213+ x { L.cookieJar = Just jar }
15721214
15731215----------------------------------------------------------------------------
15741216-- Request—Optional parameters—Authentication
@@ -1586,66 +1228,42 @@ cookieJar jar = withRequest $ \x ->
15861228-- | The 'Option' adds basic authentication.
15871229--
15881230-- See also: <https://en.wikipedia.org/wiki/Basic_access_authentication>.
1589−basicAuth ::
1590− -- | Username
1591− ByteString ->
1592− -- | Password
1593− ByteString ->
1594− -- | Auth 'Option'
1595− Option 'Https
1231+
1232+basicAuth
1233+ :: ByteString -- ^ Username
1234+ -> ByteString -- ^ Password
1235+ -> Option 'Https -- ^ Auth 'Option'
15961236basicAuth = basicAuthUnsafe
15971237
15981238-- | An alternative to 'basicAuth' which works for any scheme. Note that
1599−-- using basic access authentication without SSL\/TLS is vulnerable to
1239+-- using basic access authentication without SSL/TLS is vulnerable to
16001240-- attacks. Use 'basicAuth' instead unless you know what you are doing.
16011241--
16021242-- @since 0.3.1
1603−basicAuthUnsafe ::
1604− -- | Username
1605− ByteString ->
1606− -- | Password
1607− ByteString ->
1608− -- | Auth 'Option'
1609− Option scheme
1610−basicAuthUnsafe username password =
1611− customAuth
1612− (pure . L.applyBasicAuth username password)
1613−
1614−-- | The 'Option' set basic proxy authentication header.
1615−--
1616−-- @since 1.1.0
1617−basicProxyAuth ::
1618− -- | Username
1619− ByteString ->
1620− -- | Password
1621− ByteString ->
1622− -- | Auth 'Option'
1623− Option scheme
1624−basicProxyAuth username password =
1625− withRequest (L.applyBasicProxyAuth username password)
1243+
1244+basicAuthUnsafe
1245+ :: ByteString -- ^ Username
1246+ -> ByteString -- ^ Password
1247+ -> Option scheme -- ^ Auth 'Option'
1248+basicAuthUnsafe username password = asFinalizer
1249+ (pure . L.applyBasicAuth username password)
16261250
16271251-- | The 'Option' adds OAuth1 authentication.
16281252--
16291253-- @since 0.2.0
1630−oAuth1 ::
1631− -- | Consumer token
1632− ByteString ->
1633− -- | Consumer secret
1634− ByteString ->
1635− -- | OAuth token
1636− ByteString ->
1637− -- | OAuth token secret
1638− ByteString ->
1639− -- | Auth 'Option'
1640− Option scheme
1254+
1255+oAuth1
1256+ :: ByteString -- ^ Consumer token
1257+ -> ByteString -- ^ Consumer secret
1258+ -> ByteString -- ^ OAuth token
1259+ -> ByteString -- ^ OAuth token secret
1260+ -> Option scheme -- ^ Auth 'Option'
16411261oAuth1 consumerToken consumerSecret token tokenSecret =
1642− customAuth (OAuth.signOAuth app creds)
1262+ asFinalizer (OAuth.signOAuth app creds)
16431263 where
1644− app =
1645− OAuth.newOAuth
1646− { OAuth.oauthConsumerKey = consumerToken,
1647− OAuth.oauthConsumerSecret = consumerSecret
1648− }
1264+ app = OAuth.newOAuth
1265+ { OAuth.oauthConsumerKey = consumerToken
1266+ , OAuth.oauthConsumerSecret = consumerSecret }
16491267 creds = OAuth.newCredential token tokenSecret
16501268
16511269-- | The 'Option' adds an OAuth2 bearer token. This is treated by many
@@ -1656,14 +1274,12 @@ oAuth1 consumerToken consumerSecret token tokenSecret =
16561274-- > oAuth2Bearer token = header "Authorization" ("Bearer " <> token)
16571275--
16581276-- See also: <https://en.wikipedia.org/wiki/OAuth>.
1659−oAuth2Bearer ::
1660− -- | Token
1661− ByteString ->
1662− -- | Auth 'Option'
1663− Option 'Https
1664−oAuth2Bearer token =
1665− customAuth
1666− (pure . attachHeader "Authorization" ("Bearer " <> token))
1277+
1278+oAuth2Bearer
1279+ :: ByteString -- ^ Token
1280+ -> Option 'Https -- ^ Auth 'Option'
1281+oAuth2Bearer token = asFinalizer
1282+ (pure . attachHeader "Authorization" ("Bearer " <> token))
16671283
16681284-- | The 'Option' adds a not-quite-standard OAuth2 bearer token (that seems
16691285-- to be used only by GitHub). This will be treated by whatever services
@@ -1674,35 +1290,26 @@ oAuth2Bearer token =
16741290-- > oAuth2Token token = header "Authorization" ("token" <> token)
16751291--
16761292-- See also: <https://developer.github.com/v3/oauth#3-use-the-access-token-to-access-the-api>.
1677−oAuth2Token ::
1678− -- | Token
1679− ByteString ->
1680− -- | Auth 'Option'
1681− Option 'Https
1682−oAuth2Token token =
1683− customAuth
1684− (pure . attachHeader "Authorization" ("token " <> token))
1685−
1686−-- | A helper to create custom authentication 'Option's. The given
1687−-- 'IO'-enabled request transformation is applied after all other
1688−-- modifications when constructing a request. Use wisely.
1689−--
1690−-- @since 1.1.0
1691−customAuth :: (L.Request -> IO L.Request) -> Option scheme
1692−customAuth = Option mempty . pure
1293+
1294+oAuth2Token
1295+ :: ByteString -- ^ Token
1296+ -> Option 'Https -- ^ Auth 'Option'
1297+oAuth2Token token = asFinalizer
1298+ (pure . attachHeader "Authorization" ("token " <> token))
16931299
16941300----------------------------------------------------------------------------
16951301-- Request—Optional parameters—Other
16961302
16971303-- | Specify the port to connect to explicitly. Normally, 'Url' you use
16981304-- determines the default port: @80@ for HTTP and @443@ for HTTPS. This
1699−-- 'Option' allows us to choose an arbitrary port overwriting the defaults.
1305+-- 'Option' allows to choose arbitrary port overwriting the defaults.
1306+
17001307port :: Int -> Option scheme
17011308port n = withRequest $ \x ->
1702− x {L.port = n}
1309+ x { L.port = n }
17031310
17041311-- | This 'Option' controls whether gzipped data should be decompressed on
1705−-- the fly. By default everything except for @\"application\/x-tar\"@ is
1312+-- the fly. By default everything except for @application\/x-tar@ is
17061313-- decompressed, i.e. we have:
17071314--
17081315-- > decompress (/= "application/x-tar")
@@ -1710,48 +1317,49 @@ port n = withRequest $ \x ->
17101317-- You can also choose to decompress everything like this:
17111318--
17121319-- > decompress (const True)
1713−decompress ::
1714− -- | Predicate that is given MIME type, it returns 'True' when content
1715− -- should be decompressed on the fly.
1716− (ByteString -> Bool) ->
1717− Option scheme
1320+
1321+decompress
1322+ :: (ByteString -> Bool) -- ^ Predicate that is given MIME type, it
1323+ -- returns 'True' when content should be decompressed on the fly.
1324+ -> Option scheme
17181325decompress f = withRequest $ \x ->
1719− x {L.decompress = f}
1326+ x { L.decompress = f }
17201327
17211328-- | Specify the number of microseconds to wait for response. The default
1722−-- value is 30 seconds (defined in 'L.ManagerSettings' of connection
1723−-- 'L.Manager').
1724−responseTimeout ::
1725− -- | Number of microseconds to wait
1726− Int ->
1727− Option scheme
1329+-- value is 30 seconds.
1330+
1331+responseTimeout
1332+ :: Int -- ^ Number of microseconds to wait
1333+ -> Option scheme
17281334responseTimeout n = withRequest $ \x ->
1729− x {L.responseTimeout = LI.ResponseTimeoutMicro n}
1335+ x { L.responseTimeout = LI.ResponseTimeoutMicro n }
17301336
17311337-- | HTTP version to send to the server, the default is HTTP 1.1.
1732−httpVersion ::
1733− -- | Major version number
1734− Int ->
1735− -- | Minor version number
1736− Int ->
1737− Option scheme
1338+
1339+httpVersion
1340+ :: Int -- ^ Major version number
1341+ -> Int -- ^ Minor version number
1342+ -> Option scheme
17381343httpVersion major minor = withRequest $ \x ->
1739− x {L.requestVersion = Y.HttpVersion major minor}
1344+ x { L.requestVersion = Y.HttpVersion major minor }
17401345
17411346----------------------------------------------------------------------------
17421347-- Response interpretations
17431348
17441349-- | Make a request and ignore the body of the response.
1745−newtype IgnoreResponse = IgnoreResponse (L.Response ())
1746− deriving (Show)
1350+
1351+data IgnoreResponse = IgnoreResponse (L.Response ())
17471352
17481353instance HttpResponse IgnoreResponse where
17491354 type HttpResponseBody IgnoreResponse = ()
1750− toVanillaResponse (IgnoreResponse r) = r
1751− getHttpResponse r = return $ IgnoreResponse (void r)
1355+ toVanillaResponse (IgnoreResponse response) = response
1356+ getHttpResponse request manager =
1357+ IgnoreResponse <$> liftIO (L.httpNoBody request manager)
1358+ makeResponseBodyPreview _ = "<ignored response>"
17521359
17531360-- | Use this as the fourth argument of 'req' to specify that you want it to
17541361-- ignore the response body.
1362+
17551363ignoreResponse :: Proxy IgnoreResponse
17561364ignoreResponse = Proxy
17571365
@@ -1759,163 +1367,186 @@ ignoreResponse = Proxy
17591367-- 'handleHttpException' method of 'MonadHttp' instance corresponding to
17601368-- monad in which you use 'req' will determine what to do in the case when
17611369-- parsing fails (the 'JsonHttpException' constructor will be used).
1762−newtype JsonResponse a = JsonResponse (L.Response a)
1763− deriving (Show)
17641370
1765−instance (FromJSON a) => HttpResponse (JsonResponse a) where
1371+data JsonResponse a = JsonResponse (L.Response a) ByteString
1372+
1373+instance FromJSON a => HttpResponse (JsonResponse a) where
17661374 type HttpResponseBody (JsonResponse a) = a
1767− toVanillaResponse (JsonResponse r) = r
1768− getHttpResponse r = do
1769− chunks <- L.brConsume (L.responseBody r)
1770− case A.eitherDecode (BL.fromChunks chunks) of
1375+ toVanillaResponse (JsonResponse response _) = response
1376+ getHttpResponse request manager = do
1377+ response <- L.httpLbs request manager
1378+ case A.eitherDecode (L.responseBody response) of
17711379 Left e -> throwIO (JsonHttpException e)
1772− Right x -> return $ JsonResponse (x <$ r)
1773− acceptHeader Proxy = Just "application/json"
1380+ Right x -> do
1381+ let preview
1382+ = BL.toStrict
1383+ . BL.take bodyPreviewLength
1384+ . L.responseBody
1385+ $ response
1386+ return $ JsonResponse response { L.responseBody = x } preview
1387+ makeResponseBodyPreview (JsonResponse _ preview) = preview
17741388
17751389-- | Use this as the fourth argument of 'req' to specify that you want it to
17761390-- return the 'JsonResponse' interpretation.
1391+
17771392jsonResponse :: Proxy (JsonResponse a)
17781393jsonResponse = Proxy
17791394
17801395-- | Make a request and interpret the body of the response as a strict
17811396-- 'ByteString'.
1397+
17821398newtype BsResponse = BsResponse (L.Response ByteString)
1783− deriving (Show)
17841399
17851400instance HttpResponse BsResponse where
17861401 type HttpResponseBody BsResponse = ByteString
1787− toVanillaResponse (BsResponse r) = r
1788− getHttpResponse r = do
1789− chunks <- L.brConsume (L.responseBody r)
1790− return $ BsResponse (B.concat chunks <$ r)
1402+ toVanillaResponse (BsResponse response) = response
1403+ getHttpResponse request manager =
1404+ BsResponse <$> httpBs request manager
1405+ makeResponseBodyPreview =
1406+ B.take bodyPreviewLength . responseBody
17911407
17921408-- | Use this as the fourth argument of 'req' to specify that you want to
17931409-- interpret the response body as a strict 'ByteString'.
1410+
17941411bsResponse :: Proxy BsResponse
17951412bsResponse = Proxy
17961413
17971414-- | Make a request and interpret the body of the response as a lazy
17981415-- 'BL.ByteString'.
1416+
17991417newtype LbsResponse = LbsResponse (L.Response BL.ByteString)
1800− deriving (Show)
18011418
18021419instance HttpResponse LbsResponse where
18031420 type HttpResponseBody LbsResponse = BL.ByteString
1804− toVanillaResponse (LbsResponse r) = r
1805− getHttpResponse r = do
1806− chunks <- L.brConsume (L.responseBody r)
1807− return $ LbsResponse (BL.fromChunks chunks <$ r)
1421+ toVanillaResponse (LbsResponse response) = response
1422+ getHttpResponse request manager =
1423+ LbsResponse <$> L.httpLbs request manager
1424+ makeResponseBodyPreview =
1425+ BL.toStrict . BL.take bodyPreviewLength . responseBody
18081426
18091427-- | Use this as the fourth argument of 'req' to specify that you want to
18101428-- interpret the response body as a lazy 'BL.ByteString'.
1429+
18111430lbsResponse :: Proxy LbsResponse
18121431lbsResponse = Proxy
18131432
1814−----------------------------------------------------------------------------
1815−-- Helpers for response interpretations
1816−
1817−-- | Fetch beginning of the response and return it together with a new
1818−-- @'L.Response' 'L.BodyReader'@ that can be passed to 'getHttpResponse' and
1819−-- such.
1820−grabPreview ::
1821− -- | How many bytes to fetch
1822− Int ->
1823− -- | Response with body reader inside
1824− L.Response L.BodyReader ->
1825− -- | Preview 'ByteString' and new response with body reader inside
1826− IO (ByteString, L.Response L.BodyReader)
1827−grabPreview nbytes r = do
1828− let br = L.responseBody r
1829− (target, leftover, done) <- brReadN br nbytes
1830− nref <- newIORef (0 :: Int)
1831− let br' = do
1832− n <- readIORef nref
1833− let incn = modifyIORef' nref (+ 1)
1834− case n of
1835− 0 -> do
1836− incn
1837− if B.null target
1838− then br'
1839− else return target
1840− 1 -> do
1841− incn
1842− if B.null leftover
1843− then br'
1844− else return leftover
1845− _ ->
1846− if done
1847− then return B.empty
1848− else br
1849− return (target, r {L.responseBody = br'})
1850−
1851−-- | Consume N bytes from 'L.BodyReader', return the target chunk, the
1852−-- leftover (may be empty), and whether we're done consuming the body.
1853−brReadN ::
1854− -- | Body reader to stream from
1855− L.BodyReader ->
1856− -- | How many bytes to consume
1857− Int ->
1858− -- | Target chunk, the leftover, whether we're done
1859− IO (ByteString, ByteString, Bool)
1860−brReadN br n = go 0 id id
1861− where
1862− go !tlen t l = do
1863− chunk <- br
1864− if B.null chunk
1865− then return (r t, r l, True)
1866− else do
1867− let (target, leftover) = B.splitAt (n - tlen) chunk
1868− tlen' = B.length target
1869− t' = t . (target :)
1870− l' = l . (leftover :)
1871− if tlen + tlen' < n
1872− then go (tlen + tlen') t' l'
1873− else return (r t', r l', False)
1874− r f = B.concat (f [])
1433+-- | Make a request and interpret the body of the response as strict 'Text'.
1434+-- The 'handleHttpException' method of 'MonadHttp' instance corresponding to
1435+-- monad in which you use 'req' will determine what to do in the case when
1436+-- decoding fails (the 'TextEncHttpException' constructor will be used).
1437+--
1438+-- @since 0.5.0
1439+
1440+newtype TextResponse = TextResponse (L.Response Text)
1441+
1442+instance HttpResponse TextResponse where
1443+ type HttpResponseBody TextResponse = Text
1444+ toVanillaResponse (TextResponse r) = r
1445+ getHttpResponse request manager = do
1446+ r <- httpBs request manager
1447+ let bs = L.responseBody r
1448+ case T.decodeUtf8' bs of
1449+ Left uexc ->
1450+ (throwIO . TextEncHttpException uexc . B.take bodyPreviewLength) bs
1451+ Right txt -> return (TextResponse r { L.responseBody = txt })
1452+ makeResponseBodyPreview =
1453+ B.take bodyPreviewLength . T.encodeUtf8 . responseBody
1454+
1455+-- | Use this as the fourth argument of 'req' to specify that you want to
1456+-- interpret the response body as 'T.Text'.
1457+--
1458+-- @since 0.5.0
1459+
1460+textResponse :: Proxy TextResponse
1461+textResponse = Proxy
1462+
1463+-- | Make a request and interpret the body of the response as lazy
1464+-- 'TL.Text'. The 'handleHttpException' method of 'MonadHttp' instance
1465+-- corresponding to monad in which you use 'req' will determine what to do
1466+-- in the case when decoding fails (the 'TextEncHttpException' constructor
1467+-- will be used).
1468+--
1469+-- @since 0.5.0
1470+
1471+newtype LTextResponse = LTextResponse (L.Response TL.Text)
1472+
1473+instance HttpResponse LTextResponse where
1474+ type HttpResponseBody LTextResponse = TL.Text
1475+ toVanillaResponse (LTextResponse r) = r
1476+ getHttpResponse request manager = do
1477+ r <- L.httpLbs request manager
1478+ case TL.decodeUtf8' (L.responseBody r) of
1479+ Left uexc -> throwIO
1480+ . TextEncHttpException uexc
1481+ . BL.toStrict
1482+ . BL.take bodyPreviewLength
1483+ . L.responseBody
1484+ $ r
1485+ Right txt -> return (LTextResponse r { L.responseBody = txt })
1486+ makeResponseBodyPreview =
1487+ BL.toStrict . BL.take bodyPreviewLength . TL.encodeUtf8 . responseBody
1488+
1489+-- | Use this as the fourth argument of 'req' to specify that you want to
1490+-- interpret the response body as a lazy 'TL.Text'.
1491+--
1492+-- @since 0.5.0
1493+
1494+ltextResponse :: Proxy LTextResponse
1495+ltextResponse = Proxy
1496+
1497+-- | Perform a 'L.Request' using given 'L.Manager' and return the response
1498+-- as a strict 'ByteString'.
1499+
1500+httpBs :: L.Request -> L.Manager -> IO (L.Response ByteString)
1501+httpBs request manager = L.withResponse request manager $ \response -> do
1502+ chunks <- L.brConsume (L.responseBody response)
1503+ return response { L.responseBody = B.concat chunks }
18751504
18761505----------------------------------------------------------------------------
18771506-- Inspecting a response
18781507
18791508-- | Get the response body.
1880−responseBody ::
1881− (HttpResponse response) =>
1882− response ->
1883− HttpResponseBody response
1509+
1510+responseBody
1511+ :: HttpResponse response
1512+ => response
1513+ -> HttpResponseBody response
18841514responseBody = L.responseBody . toVanillaResponse
18851515
18861516-- | Get the response status code.
1887−responseStatusCode ::
1888− (HttpResponse response) =>
1889− response ->
1890− Int
1517+
1518+responseStatusCode
1519+ :: HttpResponse response
1520+ => response
1521+ -> Int
18911522responseStatusCode =
18921523 Y.statusCode . L.responseStatus . toVanillaResponse
18931524
18941525-- | Get the response status message.
1895−responseStatusMessage ::
1896− (HttpResponse response) =>
1897− response ->
1898− ByteString
1526+
1527+responseStatusMessage
1528+ :: HttpResponse response
1529+ => response
1530+ -> ByteString
18991531responseStatusMessage =
19001532 Y.statusMessage . L.responseStatus . toVanillaResponse
19011533
19021534-- | Lookup a particular header from a response.
1903−responseHeader ::
1904− (HttpResponse response) =>
1905− -- | Response interpretation
1906− response ->
1907− -- | Header to lookup
1908− ByteString ->
1909− -- | Header value if found
1910− Maybe ByteString
1535+
1536+responseHeader
1537+ :: HttpResponse response
1538+ => response -- ^ Response interpretation
1539+ -> ByteString -- ^ Header to lookup
1540+ -> Maybe ByteString -- ^ Header value if found
19111541responseHeader r h =
19121542 (lookup (CI.mk h) . L.responseHeaders . toVanillaResponse) r
19131543
19141544-- | Get the response 'L.CookieJar'.
1915−responseCookieJar ::
1916− (HttpResponse response) =>
1917− response ->
1918− L.CookieJar
1545+
1546+responseCookieJar
1547+ :: HttpResponse response
1548+ => response
1549+ -> L.CookieJar
19191550responseCookieJar = L.responseCookieJar . toVanillaResponse
19201551
19211552----------------------------------------------------------------------------
@@ -1924,58 +1555,37 @@ responseCookieJar = L.responseCookieJar . toVanillaResponse
19241555-- $new-response-interpretation
19251556--
19261557-- To create a new response interpretation you just need to make your data
1927−-- type an instance of the 'HttpResponse' type class.
1558+-- type an instance of 'HttpResponse' type class.
1559+
1560+-- | A type class for response interpretations. It allows to fully control
1561+-- how request is made and how its body is parsed.
19281562
1929−-- | A type class for response interpretations. It allows us to describe how
1930−-- to consume the response from a @'L.Response' 'L.BodyReader'@ and produce
1931−-- the final result that is to be returned to the user.
19321563class HttpResponse response where
1564+
19331565 -- | The associated type is the type of body that can be extracted from an
19341566 -- instance of 'HttpResponse'.
1935− type HttpResponseBody response :: Type
1567+
1568+ type HttpResponseBody response :: *
19361569
19371570 -- | The method describes how to get the underlying 'L.Response' record.
1571+
19381572 toVanillaResponse :: response -> L.Response (HttpResponseBody response)
19391573
1940− -- | This method describes how to consume response body and, more
1941− -- generally, obtain @response@ value from @'L.Response' 'L.BodyReader'@.
1942− --
1943− -- __Note__: 'L.BodyReader' is nothing but @'IO' 'ByteString'@. You should
1944− -- call this action repeatedly until it yields the empty 'ByteString'. In
1945− -- that case streaming of response is finished (which apparently leads to
1946− -- closing of the connection, so don't call the reader after it has
1947− -- returned the empty 'ByteString' once) and you can concatenate the
1948− -- chunks to obtain the final result. (Of course you could as well stream
1949− -- the contents to a file or do whatever you want.)
1950− --
1951− -- __Note__: signature of this function was changed in the version
1952− -- /1.0.0/.
1953− getHttpResponse ::
1954− -- | Response with body reader inside
1955− L.Response L.BodyReader ->
1956− -- | The final result
1957− IO response
1958−
1959− -- | The value of @\"Accept\"@ header. This is useful, for example, if a
1960− -- website supports both @XML@ and @JSON@ responses, and decides what to
1961− -- reply with based on what @Accept@ headers you have sent.
1574+ -- | This method describes how to make an HTTP request given 'L.Request'
1575+ -- (prepared by the library) and 'L.Manager'.
1576+
1577+ getHttpResponse :: L.Request -> L.Manager -> IO response
1578+
1579+ -- | Construct a “preview” of response body. It is recommend to limit the
1580+ -- length to 1024 bytes. This is mainly useful for inclusion of response
1581+ -- body fragments in exceptions.
19621582 --
1963− -- __Note__: manually specified 'Options' that set the @\"Accept\"@ header
1964− -- will take precedence.
1583+ -- __Note__: in versions 0.3.0–0.4.0 this function returned @'IO'
1584+ -- 'ByteString'@.
19651585 --
1966− -- @since 2.1.0
1967− acceptHeader :: Proxy response -> Maybe ByteString
1968− acceptHeader Proxy = Nothing
1586+ -- @since 0.5.0
19691587
1970−-- | This instance has been added to make it easier to inspect 'L.Response'
1971−-- using Req's functions like 'responseStatusCode', 'responseStatusMessage',
1972−-- etc.
1973−--
1974−-- @since 3.12.0
1975−instance HttpResponse (L.Response ()) where
1976− type HttpResponseBody (L.Response ()) = ()
1977− toVanillaResponse = id
1978− getHttpResponse = return . void
1588+ makeResponseBodyPreview :: response -> ByteString
19791589
19801590----------------------------------------------------------------------------
19811591-- Other
@@ -1985,14 +1595,15 @@ instance HttpResponse (L.Response ()) where
19851595-- 'RequestComponent' changing\/overwriting something in it. 'Endo' is a
19861596-- monoid of endomorphisms under composition, it's used to chain different
19871597-- request components easier using @('<>')@.
1988−--
1989−-- __Note__: this type class is not a part of the public API.
1598+
19901599class RequestComponent a where
1600+
19911601 -- | Get a function that takes a 'L.Request' and changes it somehow
1992− -- returning another 'L.Request'. For example, the 'HttpMethod' instance
1993− -- of 'RequestComponent' just overwrites method. The function is wrapped
1994− -- in 'Endo' so it's easier to chain such “modifying applications”
1995− -- together building bigger and bigger 'RequestComponent's.
1602+ -- returning another 'L.Request'. For example HTTP method instance of
1603+ -- 'RequestComponent' just overwrites method. The function is wrapped in
1604+ -- 'Endo' so it's easier to chain such “modifying applications” together
1605+ -- building bigger and bigger 'RequestComponent's.
1606+
19961607 getRequestMod :: a -> Endo L.Request
19971608
19981609-- | This wrapper is only used to attach a type-level tag to a given type.
@@ -2002,50 +1613,49 @@ class RequestComponent a where
20021613-- method@ and @'HttpBody' body => 'RequestComponent' body@ when it decides
20031614-- which instance to use (i.e. the constraints are taken into account later,
20041615-- when instance is already chosen).
2005−newtype Tagged (tag :: Symbol) a = Tagged a
1616+
1617+newtype Womb (tag :: Symbol) a = Womb a
20061618
20071619-- | Exceptions that this library throws.
1620+
20081621data HttpException
2009− = -- | A wrapper with an 'L.HttpException' from "Network.HTTP.Client"
2010− VanillaHttpException L.HttpException
2011− | -- | A wrapper with Aeson-produced 'String' describing why decoding
1622+ = VanillaHttpException L.HttpException
1623+ -- ^ A wrapper with an 'L.HttpException' from "Network.HTTP.Client"
1624+ | JsonHttpException String
1625+ -- ^ A wrapper with Aeson-produced 'String' describing why decoding
20121626 -- failed
2013− JsonHttpException String
2014− deriving (Show, Generic)
1627+ | TextEncHttpException TE.UnicodeException ByteString
1628+ -- ^ This value indicates that a response that was expected to be in the
1629+ -- UTF-8 encoding could not be decoded; the 'ByteString' is the
1630+ -- beginning of response in raw binary form
1631+ --
1632+ -- @since 0.5.0
1633+ deriving (Show, Typeable, Generic)
20151634
20161635instance Exception HttpException
20171636
2018−-- | Return 'Just' if the given 'HttpException' is wrapping a http-client's
2019−-- 'L.StatusCodeException'. Otherwise, return 'Nothing'.
2020−--
2021−-- @since 3.12.0
2022−isStatusCodeException :: HttpException -> Maybe (L.Response ())
2023−isStatusCodeException
2024− ( VanillaHttpException
2025− ( L.HttpExceptionRequest
2026− _
2027− (L.StatusCodeException r _)
2028− )
2029− ) = Just r
2030−isStatusCodeException _ = Nothing
2031−
2032−-- | A simple type isomorphic to 'Bool' that we only have for better error
2033−-- messages. We use it as a kind and its data constructors as type-level
2034−-- tags.
1637+-- | A simple 'Bool'-like type we only have for better error messages. We
1638+-- use it as a kind and its data constructors as type-level tags.
20351639--
20361640-- See also: 'HttpMethod' and 'HttpBody'.
1641+
20371642data CanHaveBody
2038− = -- | Indeed can have a body
2039− CanHaveBody
2040− | -- | Should not have a body
2041− NoBody
1643+ = CanHaveBody -- ^ Indeed can have a body
1644+ | NoBody -- ^ Should not have a body
20421645
20431646-- | A type-level tag that specifies URL scheme used (and thus if HTTPS is
20441647-- enabled). This is used to force TLS requirement for some authentication
20451648-- 'Option's.
1649+
20461650data Scheme
2047− = -- | HTTP
2048− Http
2049− | -- | HTTPS
2050− Https
2051− deriving (Eq, Ord, Show, Data, Generic, TH.Lift)
1651+ = Http -- ^ HTTP
1652+ | Https -- ^ HTTPS
1653+ deriving (Eq, Ord, Show, Data, Typeable, Generic)
1654+
1655+----------------------------------------------------------------------------
1656+-- Constants
1657+
1658+-- | Max length of preview fragment of response body.
1659+
1660+bodyPreviewLength :: Num a => a
1661+bodyPreviewLength = 1024