servant/servant-client-core/src/Servant/Client/Core.hs

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-- | This module provides backend-agnostic functionality for generating clients
-- from @servant@ APIs. By "backend," we mean something that concretely
-- executes the request, such as:
--
-- * The 'http-client' library
-- * The 'haxl' library
-- * GHCJS via FFI
--
-- etc.
--
-- Each backend is encapsulated in a monad that is an instance of the
-- 'RunClient' class.
--
-- This library is primarily of interest to backend-writers, who are encouraged
-- to re-export the parts of the
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module Servant.Client.Core
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(
-- * Client generation
clientIn
, HasClient(..)
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-- * Request
, Request(..)
, defaultRequest
, RequestBody(..)
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-- * Authentication
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, mkAuthenticatedRequest
, basicAuthReq
, AuthenticatedRequest(..)
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, AuthClientData
-- * Generic Client
, ClientLike(..)
, genericMkClientL
, genericMkClientP
, ServantError(..)
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, EmptyClient(..)
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-- * Response
, Response(..)
, RunClient(..)
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, module Servant.Client.Core.Internal.BaseUrl
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-- * Writing HasClient instances
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-- | These functions need not be re-exported by backend libraries.
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, addHeader
, appendToQueryString
, appendToPath
, setRequestBodyLBS
, setRequestBody
) where
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import Servant.Client.Core.Internal.Auth
import Servant.Client.Core.Internal.BaseUrl (BaseUrl (..),
InvalidBaseUrlException,
Scheme (..),
parseBaseUrl,
showBaseUrl)
import Servant.Client.Core.Internal.BasicAuth
import Servant.Client.Core.Internal.HasClient
import Servant.Client.Core.Internal.Generic
import Servant.Client.Core.Internal.Request
import Servant.Client.Core.Internal.RunClient
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{-
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import Control.Monad.Error.Class (throwError)
import Data.List (foldl')
import Data.Proxy (Proxy (Proxy))
import Data.String (fromString)
import Data.Text (pack)
import GHC.Exts (fromList, toList)
import GHC.TypeLits (KnownSymbol, symbolVal)
import qualified Network.HTTP.Types as H
import Prelude ()
import Prelude.Compat
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import Servant.API ((:<|>) ((:<|>)), (:>),
AuthProtect, BasicAuth,
BasicAuthData,
BuildHeadersTo (..),
Capture, CaptureAll,
Description, EmptyAPI,
Header, Headers (..),
HttpVersion, IsSecure,
MimeRender (mimeRender),
MimeUnrender (mimeUnrender),
NoContent (NoContent),
QueryFlag, QueryParam,
QueryParams, Raw,
ReflectMethod (..),
RemoteHost, ReqBody,
Summary, ToHttpApiData,
Vault, Verb,
WithNamedContext,
contentType,
getHeadersHList,
getResponse,
toQueryParam,
toUrlPiece)
import Servant.API.ContentTypes (contentTypes)
import Servant.Client.Core.Internal.Auth
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import Servant.Client.Core.Internal.BaseUrl (BaseUrl (..),
InvalidBaseUrlException,
Scheme (..),
parseBaseUrl,
showBaseUrl)
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import Servant.Client.Core.Internal.BasicAuth
import Servant.Client.Core.Internal.Class
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import Servant.Client.Core.Internal.Generic
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import Servant.Client.Core.Internal.Request
-- * Accessing APIs as a Client
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-- | 'clientIn' allows you to produce operations to query an API from a client
-- within a 'RunClient' monad.
--
-- > type MyApi = "books" :> Get '[JSON] [Book] -- GET /books
-- > :<|> "books" :> ReqBody '[JSON] Book :> Post '[JSON] Book -- POST /books
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > clientM :: Proxy ClientM
-- > clientM = Proxy
-- >
-- > getAllBooks :: ClientM [Book]
-- > postNewBook :: Book -> ClientM Book
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-- > (getAllBooks :<|> postNewBook) = myApi `clientIn` clientM
clientIn :: HasClient m api => Proxy api -> Proxy m -> Client m api
clientIn p pm = clientWithRoute pm p defaultRequest
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-- | This class lets us define how each API combinator influences the creation
-- of an HTTP request.
--
-- Unless you are writing a new backend for @servant-client-core@ or new
-- combinators that you want to support client-generation, you can ignore this
-- class.
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class RunClient m => HasClient m api where
type Client (m :: * -> *) (api :: *) :: *
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clientWithRoute :: Proxy m -> Proxy api -> Request -> Client m api
-- | A client querying function for @a ':<|>' b@ will actually hand you
-- one function for querying @a@ and another one for querying @b@,
-- stitching them together with ':<|>', which really is just like a pair.
--
-- > type MyApi = "books" :> Get '[JSON] [Book] -- GET /books
-- > :<|> "books" :> ReqBody '[JSON] Book :> Post Book -- POST /books
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > getAllBooks :: ClientM [Book]
-- > postNewBook :: Book -> ClientM Book
-- > (getAllBooks :<|> postNewBook) = client myApi
instance (HasClient m a, HasClient m b) => HasClient m (a :<|> b) where
type Client m (a :<|> b) = Client m a :<|> Client m b
clientWithRoute pm Proxy req =
clientWithRoute pm (Proxy :: Proxy a) req :<|>
clientWithRoute pm (Proxy :: Proxy b) req
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-- | Singleton type representing a client for an empty API.
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data EmptyClient = EmptyClient deriving (Eq, Show, Bounded, Enum)
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-- | The client for 'EmptyAPI' is simply 'EmptyClient'.
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--
-- > type MyAPI = "books" :> Get '[JSON] [Book] -- GET /books
-- > :<|> "nothing" :> EmptyAPI
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > getAllBooks :: ClientM [Book]
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-- > (getAllBooks :<|> EmptyClient) = client myApi
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instance RunClient m => HasClient m EmptyAPI where
type Client m EmptyAPI = EmptyClient
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clientWithRoute _pm Proxy _ = EmptyClient
-- | If you use a 'Capture' in one of your endpoints in your API,
-- the corresponding querying function will automatically take
-- an additional argument of the type specified by your 'Capture'.
-- That function will take care of inserting a textual representation
-- of this value at the right place in the request path.
--
-- You can control how values for this type are turned into
-- text by specifying a 'ToHttpApiData' instance for your type.
--
-- Example:
--
-- > type MyApi = "books" :> Capture "isbn" Text :> Get '[JSON] Book
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > getBook :: Text -> ClientM Book
-- > getBook = client myApi
-- > -- then you can just use "getBook" to query that endpoint
instance (KnownSymbol capture, ToHttpApiData a, HasClient m api)
=> HasClient m (Capture capture a :> api) where
type Client m (Capture capture a :> api) =
a -> Client m api
clientWithRoute pm Proxy req val =
clientWithRoute pm (Proxy :: Proxy api)
(appendToPath p req)
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where p = (toUrlPiece val)
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-- | If you use a 'CaptureAll' in one of your endpoints in your API,
-- the corresponding querying function will automatically take an
-- additional argument of a list of the type specified by your
-- 'CaptureAll'. That function will take care of inserting a textual
-- representation of this value at the right place in the request
-- path.
--
-- You can control how these values are turned into text by specifying
-- a 'ToHttpApiData' instance of your type.
--
-- Example:
--
-- > type MyAPI = "src" :> CaptureAll Text -> Get '[JSON] SourceFile
-- >
-- > myApi :: Proxy
-- > myApi = Proxy
--
-- > getSourceFile :: [Text] -> ClientM SourceFile
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-- > getSourceFile = client myApi
-- > -- then you can use "getSourceFile" to query that endpoint
instance (KnownSymbol capture, ToHttpApiData a, HasClient m sublayout)
=> HasClient m (CaptureAll capture a :> sublayout) where
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type Client m (CaptureAll capture a :> sublayout) =
[a] -> Client m sublayout
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clientWithRoute pm Proxy req vals =
clientWithRoute pm (Proxy :: Proxy sublayout)
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(foldl' (flip appendToPath) req ps)
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where ps = map (toUrlPiece) vals
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instance OVERLAPPABLE_
-- Note [Non-Empty Content Types]
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( RunClient m, MimeUnrender ct a, ReflectMethod method, cts' ~ (ct ': cts)
) => HasClient m (Verb method status cts' a) where
type Client m (Verb method status cts' a) = m a
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clientWithRoute _pm Proxy req = do
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response <- runRequest req
{ requestAccept = fromList $ toList accept
, requestMethod = method
}
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response `decodedAs` (Proxy :: Proxy ct)
where
accept = contentTypes (Proxy :: Proxy ct)
method = reflectMethod (Proxy :: Proxy method)
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instance OVERLAPPING_
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( RunClient m, ReflectMethod method
) => HasClient m (Verb method status cts NoContent) where
type Client m (Verb method status cts NoContent)
= m NoContent
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clientWithRoute _pm Proxy req = do
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_response <- runRequest req { requestMethod = method }
return NoContent
where method = reflectMethod (Proxy :: Proxy method)
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instance OVERLAPPING_
-- Note [Non-Empty Content Types]
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( RunClient m, MimeUnrender ct a, BuildHeadersTo ls
, ReflectMethod method, cts' ~ (ct ': cts)
) => HasClient m (Verb method status cts' (Headers ls a)) where
type Client m (Verb method status cts' (Headers ls a))
= m (Headers ls a)
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clientWithRoute _pm Proxy req = do
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response <- runRequest req
{ requestMethod = method
, requestAccept = fromList $ toList accept
}
case mimeUnrender (Proxy :: Proxy ct) $ responseBody response of
Left err -> throwError $ DecodeFailure (pack err) response
Right val -> return $ Headers
{ getResponse = val
, getHeadersHList = buildHeadersTo . toList $ responseHeaders response
}
where method = reflectMethod (Proxy :: Proxy method)
accept = contentTypes (Proxy :: Proxy ct)
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instance OVERLAPPING_
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( RunClient m, BuildHeadersTo ls, ReflectMethod method
) => HasClient m (Verb method status cts (Headers ls NoContent)) where
type Client m (Verb method status cts (Headers ls NoContent))
= m (Headers ls NoContent)
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clientWithRoute _pm Proxy req = do
let method = reflectMethod (Proxy :: Proxy method)
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response <- runRequest req { requestMethod = method }
return $ Headers { getResponse = NoContent
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, getHeadersHList = buildHeadersTo . toList $ responseHeaders response
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}
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-- | If you use a 'Header' in one of your endpoints in your API,
-- the corresponding querying function will automatically take
-- an additional argument of the type specified by your 'Header',
-- wrapped in Maybe.
--
-- That function will take care of encoding this argument as Text
-- in the request headers.
--
-- All you need is for your type to have a 'ToHttpApiData' instance.
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--
-- Example:
--
-- > newtype Referer = Referer { referrer :: Text }
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-- > deriving (Eq, Show, Generic, ToHttpApiData)
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-- >
-- > -- GET /view-my-referer
-- > type MyApi = "view-my-referer" :> Header "Referer" Referer :> Get '[JSON] Referer
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-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > viewReferer :: Maybe Referer -> ClientM Book
-- > viewReferer = client myApi
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-- > -- then you can just use "viewRefer" to query that endpoint
-- > -- specifying Nothing or e.g Just "http://haskell.org/" as arguments
instance (KnownSymbol sym, ToHttpApiData a, HasClient m api)
=> HasClient m (Header sym a :> api) where
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type Client m (Header sym a :> api) =
Maybe a -> Client m api
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clientWithRoute pm Proxy req mval =
clientWithRoute pm (Proxy :: Proxy api)
(maybe req
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(\value -> addHeader hname value req)
mval
)
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where hname = fromString $ symbolVal (Proxy :: Proxy sym)
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-- | Using a 'HttpVersion' combinator in your API doesn't affect the client
-- functions.
instance HasClient m api
=> HasClient m (HttpVersion :> api) where
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type Client m (HttpVersion :> api) =
Client m api
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clientWithRoute pm Proxy =
clientWithRoute pm (Proxy :: Proxy api)
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-- | Ignore @'Summary'@ in client functions.
instance HasClient m api => HasClient m (Summary desc :> api) where
type Client m (Summary desc :> api) = Client m api
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clientWithRoute pm _ = clientWithRoute pm (Proxy :: Proxy api)
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-- | Ignore @'Description'@ in client functions.
instance HasClient m api => HasClient m (Description desc :> api) where
type Client m (Description desc :> api) = Client m api
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clientWithRoute pm _ = clientWithRoute pm (Proxy :: Proxy api)
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-- | If you use a 'QueryParam' in one of your endpoints in your API,
-- the corresponding querying function will automatically take
-- an additional argument of the type specified by your 'QueryParam',
-- enclosed in Maybe.
--
-- If you give Nothing, nothing will be added to the query string.
--
-- If you give a non-'Nothing' value, this function will take care
-- of inserting a textual representation of this value in the query string.
--
-- You can control how values for your type are turned into
-- text by specifying a 'ToHttpApiData' instance for your type.
--
-- Example:
--
-- > type MyApi = "books" :> QueryParam "author" Text :> Get '[JSON] [Book]
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > getBooksBy :: Maybe Text -> ClientM [Book]
-- > getBooksBy = client myApi
-- > -- then you can just use "getBooksBy" to query that endpoint.
-- > -- 'getBooksBy Nothing' for all books
-- > -- 'getBooksBy (Just "Isaac Asimov")' to get all books by Isaac Asimov
instance (KnownSymbol sym, ToHttpApiData a, HasClient m api)
=> HasClient m (QueryParam sym a :> api) where
type Client m (QueryParam sym a :> api) =
Maybe a -> Client m api
-- if mparam = Nothing, we don't add it to the query string
clientWithRoute pm Proxy req mparam =
clientWithRoute pm (Proxy :: Proxy api)
(maybe req
(flip (appendToQueryString pname) req . Just)
mparamText
)
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where pname = pack $ symbolVal (Proxy :: Proxy sym)
mparamText = fmap toQueryParam mparam
-- | If you use a 'QueryParams' in one of your endpoints in your API,
-- the corresponding querying function will automatically take
-- an additional argument, a list of values of the type specified
-- by your 'QueryParams'.
--
-- If you give an empty list, nothing will be added to the query string.
--
-- Otherwise, this function will take care
-- of inserting a textual representation of your values in the query string,
-- under the same query string parameter name.
--
-- You can control how values for your type are turned into
-- text by specifying a 'ToHttpApiData' instance for your type.
--
-- Example:
--
-- > type MyApi = "books" :> QueryParams "authors" Text :> Get '[JSON] [Book]
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > getBooksBy :: [Text] -> ClientM [Book]
-- > getBooksBy = client myApi
-- > -- then you can just use "getBooksBy" to query that endpoint.
-- > -- 'getBooksBy []' for all books
-- > -- 'getBooksBy ["Isaac Asimov", "Robert A. Heinlein"]'
-- > -- to get all books by Asimov and Heinlein
instance (KnownSymbol sym, ToHttpApiData a, HasClient m api)
=> HasClient m (QueryParams sym a :> api) where
type Client m (QueryParams sym a :> api) =
[a] -> Client m api
clientWithRoute pm Proxy req paramlist =
clientWithRoute pm (Proxy :: Proxy api)
(foldl' (\ req' -> maybe req' (flip (appendToQueryString pname) req' . Just))
req
paramlist'
)
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where pname = pack $ symbolVal (Proxy :: Proxy sym)
paramlist' = map (Just . toQueryParam) paramlist
-- | If you use a 'QueryFlag' in one of your endpoints in your API,
-- the corresponding querying function will automatically take
-- an additional 'Bool' argument.
--
-- If you give 'False', nothing will be added to the query string.
--
-- Otherwise, this function will insert a value-less query string
-- parameter under the name associated to your 'QueryFlag'.
--
-- Example:
--
-- > type MyApi = "books" :> QueryFlag "published" :> Get '[JSON] [Book]
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > getBooks :: Bool -> ClientM [Book]
-- > getBooks = client myApi
-- > -- then you can just use "getBooks" to query that endpoint.
-- > -- 'getBooksBy False' for all books
-- > -- 'getBooksBy True' to only get _already published_ books
instance (KnownSymbol sym, HasClient m api)
=> HasClient m (QueryFlag sym :> api) where
type Client m (QueryFlag sym :> api) =
Bool -> Client m api
clientWithRoute pm Proxy req flag =
clientWithRoute pm (Proxy :: Proxy api)
(if flag
then appendToQueryString paramname Nothing req
else req
)
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where paramname = pack $ symbolVal (Proxy :: Proxy sym)
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-- | Pick a 'Method' and specify where the server you want to query is. You get
-- back the full `Response`.
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instance RunClient m => HasClient m Raw where
type Client m Raw
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= H.Method -> m Response
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clientWithRoute :: Proxy m -> Proxy Raw -> Request -> Client m Raw
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clientWithRoute _pm Proxy req httpMethod = do
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runRequest req { requestMethod = httpMethod }
-- | If you use a 'ReqBody' in one of your endpoints in your API,
-- the corresponding querying function will automatically take
-- an additional argument of the type specified by your 'ReqBody'.
-- That function will take care of encoding this argument as JSON and
-- of using it as the request body.
--
-- All you need is for your type to have a 'ToJSON' instance.
--
-- Example:
--
-- > type MyApi = "books" :> ReqBody '[JSON] Book :> Post '[JSON] Book
-- >
-- > myApi :: Proxy MyApi
-- > myApi = Proxy
-- >
-- > addBook :: Book -> ClientM Book
-- > addBook = client myApi
-- > -- then you can just use "addBook" to query that endpoint
instance (MimeRender ct a, HasClient m api)
=> HasClient m (ReqBody (ct ': cts) a :> api) where
type Client m (ReqBody (ct ': cts) a :> api) =
a -> Client m api
clientWithRoute pm Proxy req body =
clientWithRoute pm (Proxy :: Proxy api)
(let ctProxy = Proxy :: Proxy ct
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in setRequestBodyLBS (mimeRender ctProxy body)
-- We use first contentType from the Accept list
(contentType ctProxy)
req
)
-- | Make the querying function append @path@ to the request path.
instance (KnownSymbol path, HasClient m api) => HasClient m (path :> api) where
type Client m (path :> api) = Client m api
clientWithRoute pm Proxy req =
clientWithRoute pm (Proxy :: Proxy api)
(appendToPath p req)
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where p = pack $ symbolVal (Proxy :: Proxy path)
instance HasClient m api => HasClient m (Vault :> api) where
type Client m (Vault :> api) = Client m api
clientWithRoute pm Proxy req =
clientWithRoute pm (Proxy :: Proxy api) req
instance HasClient m api => HasClient m (RemoteHost :> api) where
type Client m (RemoteHost :> api) = Client m api
clientWithRoute pm Proxy req =
clientWithRoute pm (Proxy :: Proxy api) req
instance HasClient m api => HasClient m (IsSecure :> api) where
type Client m (IsSecure :> api) = Client m api
clientWithRoute pm Proxy req =
clientWithRoute pm (Proxy :: Proxy api) req
instance HasClient m subapi =>
HasClient m (WithNamedContext name context subapi) where
type Client m (WithNamedContext name context subapi) = Client m subapi
clientWithRoute pm Proxy = clientWithRoute pm (Proxy :: Proxy subapi)
instance ( HasClient m api
) => HasClient m (AuthProtect tag :> api) where
type Client m (AuthProtect tag :> api)
= AuthenticateReq (AuthProtect tag) -> Client m api
clientWithRoute pm Proxy req (AuthenticateReq (val,func)) =
clientWithRoute pm (Proxy :: Proxy api) (func val req)
-- * Basic Authentication
instance HasClient m api => HasClient m (BasicAuth realm usr :> api) where
type Client m (BasicAuth realm usr :> api) = BasicAuthData -> Client m api
clientWithRoute pm Proxy req val =
clientWithRoute pm (Proxy :: Proxy api) (basicAuthReq val req)
{- Note [Non-Empty Content Types]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Rather than have
instance (..., cts' ~ (ct ': cts)) => ... cts' ...
It may seem to make more sense to have:
instance (...) => ... (ct ': cts) ...
But this means that if another instance exists that does *not* require
non-empty lists, but is otherwise more specific, no instance will be overall
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more specific. This in turn generally means adding yet another instance (one
for empty and one for non-empty lists).
-}
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-}