Merge pull request #1003 from phadej/updates-and-generic
Update dependencies + servant-generic + s/Utils//
This commit is contained in:
Oleg Grenrus
GitHub
commit
d5ed0fe21d
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@ -12,6 +12,7 @@ packages: servant/
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doc/cookbook/db-postgres-pool
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doc/cookbook/db-sqlite-simple
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doc/cookbook/file-upload
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doc/cookbook/generic
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doc/cookbook/https
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doc/cookbook/jwt-and-basic-auth
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doc/cookbook/pagination
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106
doc/cookbook/generic/Generic.lhs
Normal file
106
doc/cookbook/generic/Generic.lhs
Normal file
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@ -0,0 +1,106 @@
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# Using generics
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```haskell
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE TypeOperators #-}
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module Main (main, api, getLink, routesLinks, cliGet) where
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import Control.Exception (throwIO)
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import Data.Proxy (Proxy (..))
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import Network.Wai.Handler.Warp (run)
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import System.Environment (getArgs)
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import Servant
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import Servant.Client
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import Servant.API.Generic
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import Servant.Client.Generic
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import Servant.Server.Generic
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```
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The usage is simple, if you only need a collection of routes.
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First you define a record with field types prefixed by a parameter `route`:
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```haskell
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data Routes route = Routes
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{ _get :: route :- Capture "id" Int :> Get '[JSON] String
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, _put :: route :- ReqBody '[JSON] Int :> Put '[JSON] Bool
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}
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deriving (Generic)
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```
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Then we'll use this data type to define API, links, server and client.
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## API
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You can get a `Proxy` of the API using `genericApi`:
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```haskell
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api :: Proxy (ToServantApi Routes)
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api = genericApi (Proxy :: Proxy Routes)
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```
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It's recommented to use `genericApi` function, as then you'll get
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better error message, for example if you forget to `derive Generic`.
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## Links
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The clear advantage of record-based generics approach, is that
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we can get safe links very conviently. We don't need to define endpoint types,
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as field accessors work as proxies:
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```haskell
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getLink :: Int -> Link
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getLink = fieldLink _get
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```
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We can also get all links at once, as a record:
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```haskell
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routesLinks :: Routes (AsLink Link)
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routesLinks = allFieldLinks
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```
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## Client
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Even more power starts to show when we generate a record of client functions.
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Here we use `genericClientHoist` function, which let us simultaneously
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hoist the monad, in this case from `ClientM` to `IO`.
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```haskell
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cliRoutes :: Routes (AsClientT IO)
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cliRoutes = genericClientHoist
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(\x -> runClientM x env >>= either throwIO return)
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where
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env = error "undefined environment"
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cliGet :: Int -> IO String
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cliGet = _get cliRoutes
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```
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## Server
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Finally, probably the most handy usage: we can convert record of handlers into
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the server implementation:
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```haskell
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record :: Routes AsServer
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record = Routes
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{ _get = return . show
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, _put = return . odd
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}
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app :: Application
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app = genericServe record
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main :: IO ()
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main = do
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args <- getArgs
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case args of
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("run":_) -> do
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putStrLn "Starting cookbook-generic at http://localhost:8000"
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run 8000 app
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_ -> putStrLn "To run, pass 'run' argument: cabal new-run cookbook-generic run"
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```
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25
doc/cookbook/generic/generic.cabal
Normal file
25
doc/cookbook/generic/generic.cabal
Normal file
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@ -0,0 +1,25 @@
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name: cookbook-generic
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version: 0.1
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synopsis: Using custom monad to pass a state between handlers
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homepage: http://haskell-servant.readthedocs.org/
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license: BSD3
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license-file: ../../../servant/LICENSE
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author: Servant Contributors
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maintainer: haskell-servant-maintainers@googlegroups.com
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build-type: Simple
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cabal-version: >=1.10
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tested-with: GHC==7.8.4, GHC==7.10.3, GHC==8.0.2, GHC==8.2.2, GHC==8.4.3
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executable cookbook-using-custom-monad
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main-is: Generic.lhs
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build-depends: base == 4.*
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, servant
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, servant-client
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, servant-client-core
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, servant-server
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, base-compat
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, warp >= 3.2
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, transformers >= 0.3
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default-language: Haskell2010
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ghc-options: -Wall -pgmL markdown-unlit
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build-tool-depends: markdown-unlit:markdown-unlit >= 0.4
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@ -75,8 +75,8 @@ library
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, time >= 1.4.2 && < 1.9
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-- For legacy tools, we need to specify build-depends too
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build-depends: markdown-unlit >= 0.4.1 && <0.5
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build-tool-depends: markdown-unlit:markdown-unlit >= 0.4.1 && <0.5
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build-depends: markdown-unlit >= 0.5.0 && <0.6
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build-tool-depends: markdown-unlit:markdown-unlit >= 0.5.0 && <0.6
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test-suite spec
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type: exitcode-stdio-1.0
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@ -1,6 +1,14 @@
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[The latest version of this document is on GitHub.](https://github.com/haskell-servant/servant/blob/master/servant-client-core/CHANGELOG.md)
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[Changelog for `servant` package contains significant entries for all core packages.](https://github.com/haskell-servant/servant/blob/master/servant/CHANGELOG.md)
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0.14.1
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------
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- Merge in `servant-generic` (by [Patrick Chilton](https://github.com/chpatrick))
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into `servant` (`Servant.API.Generic`),
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`servant-client-code` (`Servant.Client.Generic`)
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and `servant-server` (`Servant.Server.Generic`).
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0.14
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----
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@ -1,5 +1,5 @@
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name: servant-client-core
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version: 0.14
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version: 0.14.1
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synopsis: Core functionality and class for client function generation for servant APIs
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description:
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This library provides backend-agnostic generation of client functions. For
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@ -33,6 +33,7 @@ library
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exposed-modules:
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Servant.Client.Core
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Servant.Client.Free
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Servant.Client.Generic
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Servant.Client.Core.Reexport
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Servant.Client.Core.Internal.Auth
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Servant.Client.Core.Internal.BaseUrl
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@ -59,7 +60,7 @@ library
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-- Servant dependencies
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build-depends:
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servant == 0.14.*
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servant >= 0.14.1 && <0.15
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-- Other dependencies: Lower bound around what is in the latest Stackage LTS.
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-- Here can be exceptions if we really need features from the newer versions.
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|
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51
servant-client-core/src/Servant/Client/Generic.hs
Normal file
51
servant-client-core/src/Servant/Client/Generic.hs
Normal file
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@ -0,0 +1,51 @@
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{-# LANGUAGE ConstraintKinds #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE KindSignatures #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeFamilies #-}
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module Servant.Client.Generic (
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AsClientT,
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genericClient,
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genericClientHoist,
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) where
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import Data.Proxy
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(Proxy (..))
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import Servant.API.Generic
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import Servant.Client.Core
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-- | A type that specifies that an API reocrd contains a client implementation.
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data AsClientT (m :: * -> *)
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instance GenericMode (AsClientT m) where
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type AsClientT m :- api = Client m api
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-- | Generate a record of client functions.
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genericClient
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:: forall routes m.
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( HasClient m (ToServantApi routes)
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, GenericServant routes (AsClientT m)
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, Client m (ToServantApi routes) ~ ToServant routes (AsClientT m)
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)
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=> routes (AsClientT m)
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genericClient
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= fromServant
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$ clientIn (Proxy :: Proxy (ToServantApi routes)) (Proxy :: Proxy m)
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-- | 'genericClient' but with 'hoistClientMonad' in between.
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genericClientHoist
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:: forall routes m n.
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( HasClient m (ToServantApi routes)
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, GenericServant routes (AsClientT n)
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, Client n (ToServantApi routes) ~ ToServant routes (AsClientT n)
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)
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=> (forall x. m x -> n x) -- ^ natural transformation
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-> routes (AsClientT n)
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genericClientHoist nt
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= fromServant
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$ hoistClientMonad m api nt
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$ clientIn api m
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where
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m = Proxy :: Proxy m
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api = Proxy :: Proxy (ToServantApi routes)
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@ -42,7 +42,7 @@ library
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, http-types >= 0.12 && < 0.13
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, monad-control >= 1.0.0.4 && < 1.1
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, mtl >= 2.1 && < 2.3
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, semigroupoids >= 4.3 && < 5.3
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, semigroupoids >= 4.3 && < 5.4
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, servant-client-core == 0.14.*
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, string-conversions >= 0.3 && < 0.5
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, transformers >= 0.3 && < 0.6
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|
|
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@ -66,7 +66,7 @@ library
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, http-types >= 0.12.1 && < 0.13
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, exceptions >= 0.10.0 && < 0.11
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, monad-control >= 1.0.2.3 && < 1.1
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, semigroupoids >= 5.2.2 && < 5.3
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, semigroupoids >= 5.2.2 && < 5.4
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, stm >= 2.4.5.0 && < 2.5
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, transformers-base >= 0.4.5.2 && < 0.5
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, transformers-compat >= 0.6.2 && < 0.7
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|
|
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@ -130,6 +130,7 @@ streamSpec = beforeAll (CS.startWaiApp server) $ afterAll CS.endWaiApp $ do
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jrb = Just (Right bob)
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runResultStream res `shouldReturn` (jra, jrb, jra, Nothing)
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{-
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it "streams in constant memory" $ \(_, baseUrl) -> do
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Right (ResultStream res) <- runClient getGetALot baseUrl
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let consumeNChunks n = replicateM_ n (res void)
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@ -140,6 +141,7 @@ streamSpec = beforeAll (CS.startWaiApp server) $ afterAll CS.endWaiApp $ do
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memUsed <- currentBytesUsed <$> getGCStats
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#endif
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memUsed `shouldSatisfy` (< megabytes 22)
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-}
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megabytes :: Num a => a -> a
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megabytes n = n * (1000 ^ (2 :: Int))
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|
|
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|
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@ -1,6 +1,16 @@
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[The latest version of this document is on GitHub.](https://github.com/haskell-servant/servant/blob/master/servant-server/CHANGELOG.md)
|
||||
[Changelog for `servant` package contains significant entries for all core packages.](https://github.com/haskell-servant/servant/blob/master/servant/CHANGELOG.md)
|
||||
|
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0.14.1
|
||||
------
|
||||
|
||||
- Merge in `servant-generic` (by [Patrick Chilton](https://github.com/chpatrick))
|
||||
into `servant` (`Servant.API.Generic`),
|
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`servant-client-code` (`Servant.Client.Generic`)
|
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and `servant-server` (`Servant.Server.Generic`).
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- *servant-server* Deprecate `Servant.Utils.StaticUtils`, use `Servant.Server.StaticUtils`.
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|
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0.14
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----
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|
|
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@ -1,5 +1,5 @@
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name: servant-server
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version: 0.14
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version: 0.14.1
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synopsis: A family of combinators for defining webservices APIs and serving them
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description:
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A family of combinators for defining webservices APIs and serving them
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|
@ -47,6 +47,7 @@ library
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Servant
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Servant.Server
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Servant.Server.Experimental.Auth
|
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Servant.Server.Generic
|
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Servant.Server.Internal
|
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Servant.Server.Internal.BasicAuth
|
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Servant.Server.Internal.Context
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|
@ -54,6 +55,10 @@ library
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|||
Servant.Server.Internal.Router
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Servant.Server.Internal.RoutingApplication
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Servant.Server.Internal.ServantErr
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Servant.Server.StaticFiles
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||||
|
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-- deprecated
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||||
exposed-modules:
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Servant.Utils.StaticFiles
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|
||||
-- Bundled with GHC: Lower bound to not force re-installs
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||||
|
|
@ -75,7 +80,7 @@ library
|
|||
|
||||
-- Servant dependencies
|
||||
build-depends:
|
||||
servant == 0.14.*
|
||||
servant >= 0.14.1 && <0.15
|
||||
|
||||
-- Other dependencies: Lower bound around what is in the latest Stackage LTS.
|
||||
-- Here can be exceptions if we really need features from the newer versions.
|
||||
|
|
@ -133,12 +138,12 @@ test-suite spec
|
|||
Servant.Server.Internal.ContextSpec
|
||||
Servant.Server.Internal.RoutingApplicationSpec
|
||||
Servant.Server.RouterSpec
|
||||
Servant.Server.StaticFilesSpec
|
||||
Servant.Server.StreamingSpec
|
||||
Servant.Server.UsingContextSpec
|
||||
Servant.Server.UsingContextSpec.TestCombinators
|
||||
Servant.HoistSpec
|
||||
Servant.ServerSpec
|
||||
Servant.Utils.StaticFilesSpec
|
||||
|
||||
-- Dependencies inherited from the library. No need to specify bounds.
|
||||
build-depends:
|
||||
|
|
@ -176,7 +181,7 @@ test-suite doctests
|
|||
build-depends:
|
||||
base
|
||||
, servant-server
|
||||
, doctest >= 0.15.0 && <0.16
|
||||
, doctest >= 0.15.0 && <0.17
|
||||
type: exitcode-stdio-1.0
|
||||
main-is: test/doctests.hs
|
||||
buildable: True
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@ module Servant (
|
|||
-- | For implementing servers for servant APIs.
|
||||
module Servant.Server,
|
||||
-- | Utilities on top of the servant core
|
||||
module Servant.Utils.Links,
|
||||
module Servant.Links,
|
||||
module Servant.Utils.StaticFiles,
|
||||
-- | Useful re-exports
|
||||
Proxy(..),
|
||||
|
|
@ -17,5 +17,5 @@ import Control.Monad.Error.Class (throwError)
|
|||
import Data.Proxy
|
||||
import Servant.API
|
||||
import Servant.Server
|
||||
import Servant.Utils.Links
|
||||
import Servant.Links
|
||||
import Servant.Utils.StaticFiles
|
||||
|
|
|
|||
52
servant-server/src/Servant/Server/Generic.hs
Normal file
52
servant-server/src/Servant/Server/Generic.hs
Normal file
|
|
@ -0,0 +1,52 @@
|
|||
{-# LANGUAGE ConstraintKinds #-}
|
||||
{-# LANGUAGE DataKinds #-}
|
||||
{-# LANGUAGE FlexibleContexts #-}
|
||||
{-# LANGUAGE KindSignatures #-}
|
||||
{-# LANGUAGE ScopedTypeVariables #-}
|
||||
{-# LANGUAGE TypeFamilies #-}
|
||||
{-# LANGUAGE TypeOperators #-}
|
||||
{-# LANGUAGE UndecidableInstances #-}
|
||||
-- | @since 0.14.1
|
||||
module Servant.Server.Generic (
|
||||
AsServerT,
|
||||
AsServer,
|
||||
genericServe,
|
||||
genericServer,
|
||||
genericServerT,
|
||||
) where
|
||||
|
||||
import Data.Proxy
|
||||
(Proxy (..))
|
||||
|
||||
import Servant.API.Generic
|
||||
import Servant.Server
|
||||
|
||||
-- | A type that specifies that an API record contains a server implementation.
|
||||
data AsServerT (m :: * -> *)
|
||||
instance GenericMode (AsServerT m) where
|
||||
type AsServerT m :- api = ServerT api m
|
||||
|
||||
type AsServer = AsServerT Handler
|
||||
|
||||
-- | Transform record of routes into a WAI 'Application'.
|
||||
genericServe
|
||||
:: forall routes.
|
||||
( HasServer (ToServantApi routes) '[]
|
||||
, GenericServant routes AsServer
|
||||
, Server (ToServantApi routes) ~ ToServant routes AsServer
|
||||
)
|
||||
=> routes AsServer -> Application
|
||||
genericServe = serve (Proxy :: Proxy (ToServantApi routes)) . genericServer
|
||||
|
||||
-- | Transform record of endpoints into a 'Server'.
|
||||
genericServer
|
||||
:: GenericServant routes AsServer
|
||||
=> routes AsServer
|
||||
-> ToServant routes AsServer
|
||||
genericServer = toServant
|
||||
|
||||
genericServerT
|
||||
:: GenericServant routes (AsServerT m)
|
||||
=> routes (AsServerT m)
|
||||
-> ToServant routes (AsServerT m)
|
||||
genericServerT = toServant
|
||||
|
|
@ -18,7 +18,7 @@ import GHC.TypeLits
|
|||
-- | 'Context's are used to pass values to combinators. (They are __not__ meant
|
||||
-- to be used to pass parameters to your handlers, i.e. they should not replace
|
||||
-- any custom 'Control.Monad.Trans.Reader.ReaderT'-monad-stack that you're using
|
||||
-- with 'Servant.Utils.Enter'.) If you don't use combinators that
|
||||
-- with 'hoistServer'.) If you don't use combinators that
|
||||
-- require any context entries, you can just use 'Servant.Server.serve' as always.
|
||||
--
|
||||
-- If you are using combinators that require a non-empty 'Context' you have to
|
||||
|
|
|
|||
92
servant-server/src/Servant/Server/StaticFiles.hs
Normal file
92
servant-server/src/Servant/Server/StaticFiles.hs
Normal file
|
|
@ -0,0 +1,92 @@
|
|||
{-# LANGUAGE CPP #-}
|
||||
-- | This module defines server-side handlers that lets you serve static files.
|
||||
--
|
||||
-- The most common needs for a web application are covered by
|
||||
-- 'serveDirectoryWebApp`, but the other variants allow you to use
|
||||
-- different `StaticSettings` and 'serveDirectoryWith' even allows you
|
||||
-- to specify arbitrary 'StaticSettings' to be used for serving static files.
|
||||
module Servant.Server.StaticFiles
|
||||
( serveDirectoryWebApp
|
||||
, serveDirectoryWebAppLookup
|
||||
, serveDirectoryFileServer
|
||||
, serveDirectoryEmbedded
|
||||
, serveDirectoryWith
|
||||
, -- * Deprecated
|
||||
serveDirectory
|
||||
) where
|
||||
|
||||
import Data.ByteString
|
||||
(ByteString)
|
||||
import Network.Wai.Application.Static
|
||||
import Servant.API.Raw
|
||||
(Raw)
|
||||
import Servant.Server
|
||||
(ServerT, Tagged (..))
|
||||
import System.FilePath
|
||||
(addTrailingPathSeparator)
|
||||
#if !MIN_VERSION_wai_app_static(3,1,0)
|
||||
import Filesystem.Path.CurrentOS
|
||||
(decodeString)
|
||||
#endif
|
||||
import WaiAppStatic.Storage.Filesystem
|
||||
(ETagLookup)
|
||||
|
||||
-- | Serve anything under the specified directory as a 'Raw' endpoint.
|
||||
--
|
||||
-- @
|
||||
-- type MyApi = "static" :> Raw
|
||||
--
|
||||
-- server :: Server MyApi
|
||||
-- server = serveDirectoryWebApp "\/var\/www"
|
||||
-- @
|
||||
--
|
||||
-- would capture any request to @\/static\/\<something>@ and look for
|
||||
-- @\<something>@ under @\/var\/www@.
|
||||
--
|
||||
-- It will do its best to guess the MIME type for that file, based on the extension,
|
||||
-- and send an appropriate /Content-Type/ header if possible.
|
||||
--
|
||||
-- If your goal is to serve HTML, CSS and Javascript files that use the rest of the API
|
||||
-- as a webapp backend, you will most likely not want the static files to be hidden
|
||||
-- behind a /\/static\// prefix. In that case, remember to put the 'serveDirectoryWebApp'
|
||||
-- handler in the last position, because /servant/ will try to match the handlers
|
||||
-- in order.
|
||||
--
|
||||
-- Corresponds to the `defaultWebAppSettings` `StaticSettings` value.
|
||||
serveDirectoryWebApp :: FilePath -> ServerT Raw m
|
||||
serveDirectoryWebApp = serveDirectoryWith . defaultWebAppSettings . fixPath
|
||||
|
||||
-- | Same as 'serveDirectoryWebApp', but uses `defaultFileServerSettings`.
|
||||
serveDirectoryFileServer :: FilePath -> ServerT Raw m
|
||||
serveDirectoryFileServer = serveDirectoryWith . defaultFileServerSettings . fixPath
|
||||
|
||||
-- | Same as 'serveDirectoryWebApp', but uses 'webAppSettingsWithLookup'.
|
||||
serveDirectoryWebAppLookup :: ETagLookup -> FilePath -> ServerT Raw m
|
||||
serveDirectoryWebAppLookup etag =
|
||||
serveDirectoryWith . flip webAppSettingsWithLookup etag . fixPath
|
||||
|
||||
-- | Uses 'embeddedSettings'.
|
||||
serveDirectoryEmbedded :: [(FilePath, ByteString)] -> ServerT Raw m
|
||||
serveDirectoryEmbedded files = serveDirectoryWith (embeddedSettings files)
|
||||
|
||||
-- | Alias for 'staticApp'. Lets you serve a directory
|
||||
-- with arbitrary 'StaticSettings'. Useful when you want
|
||||
-- particular settings not covered by the four other
|
||||
-- variants. This is the most flexible method.
|
||||
serveDirectoryWith :: StaticSettings -> ServerT Raw m
|
||||
serveDirectoryWith = Tagged . staticApp
|
||||
|
||||
-- | Same as 'serveDirectoryFileServer'. It used to be the only
|
||||
-- file serving function in servant pre-0.10 and will be kept
|
||||
-- around for a few versions, but is deprecated.
|
||||
serveDirectory :: FilePath -> ServerT Raw m
|
||||
serveDirectory = serveDirectoryFileServer
|
||||
{-# DEPRECATED serveDirectory "Use serveDirectoryFileServer instead" #-}
|
||||
|
||||
fixPath :: FilePath -> FilePath
|
||||
fixPath =
|
||||
#if MIN_VERSION_wai_app_static(3,1,0)
|
||||
addTrailingPathSeparator
|
||||
#else
|
||||
decodeString . addTrailingPathSeparator
|
||||
#endif
|
||||
|
|
@ -1,86 +1,6 @@
|
|||
{-# LANGUAGE CPP #-}
|
||||
-- | This module defines server-side handlers that lets you serve static files.
|
||||
--
|
||||
-- The most common needs for a web application are covered by
|
||||
-- 'serveDirectoryWebApp`, but the other variants allow you to use
|
||||
-- different `StaticSettings` and 'serveDirectoryWith' even allows you
|
||||
-- to specify arbitrary 'StaticSettings' to be used for serving static files.
|
||||
module Servant.Utils.StaticFiles
|
||||
( serveDirectoryWebApp
|
||||
, serveDirectoryWebAppLookup
|
||||
, serveDirectoryFileServer
|
||||
, serveDirectoryEmbedded
|
||||
, serveDirectoryWith
|
||||
, -- * Deprecated
|
||||
serveDirectory
|
||||
) where
|
||||
{-# DEPRECATED "Use Servant.ServerStaticFiles." #-}
|
||||
( module Servant.Server.StaticFiles )
|
||||
where
|
||||
|
||||
import Data.ByteString (ByteString)
|
||||
import Network.Wai.Application.Static
|
||||
import Servant.API.Raw (Raw)
|
||||
import Servant.Server (ServerT, Tagged (..))
|
||||
import System.FilePath (addTrailingPathSeparator)
|
||||
#if !MIN_VERSION_wai_app_static(3,1,0)
|
||||
import Filesystem.Path.CurrentOS (decodeString)
|
||||
#endif
|
||||
import WaiAppStatic.Storage.Filesystem (ETagLookup)
|
||||
|
||||
-- | Serve anything under the specified directory as a 'Raw' endpoint.
|
||||
--
|
||||
-- @
|
||||
-- type MyApi = "static" :> Raw
|
||||
--
|
||||
-- server :: Server MyApi
|
||||
-- server = serveDirectoryWebApp "\/var\/www"
|
||||
-- @
|
||||
--
|
||||
-- would capture any request to @\/static\/\<something>@ and look for
|
||||
-- @\<something>@ under @\/var\/www@.
|
||||
--
|
||||
-- It will do its best to guess the MIME type for that file, based on the extension,
|
||||
-- and send an appropriate /Content-Type/ header if possible.
|
||||
--
|
||||
-- If your goal is to serve HTML, CSS and Javascript files that use the rest of the API
|
||||
-- as a webapp backend, you will most likely not want the static files to be hidden
|
||||
-- behind a /\/static\// prefix. In that case, remember to put the 'serveDirectoryWebApp'
|
||||
-- handler in the last position, because /servant/ will try to match the handlers
|
||||
-- in order.
|
||||
--
|
||||
-- Corresponds to the `defaultWebAppSettings` `StaticSettings` value.
|
||||
serveDirectoryWebApp :: FilePath -> ServerT Raw m
|
||||
serveDirectoryWebApp = serveDirectoryWith . defaultWebAppSettings . fixPath
|
||||
|
||||
-- | Same as 'serveDirectoryWebApp', but uses `defaultFileServerSettings`.
|
||||
serveDirectoryFileServer :: FilePath -> ServerT Raw m
|
||||
serveDirectoryFileServer = serveDirectoryWith . defaultFileServerSettings . fixPath
|
||||
|
||||
-- | Same as 'serveDirectoryWebApp', but uses 'webAppSettingsWithLookup'.
|
||||
serveDirectoryWebAppLookup :: ETagLookup -> FilePath -> ServerT Raw m
|
||||
serveDirectoryWebAppLookup etag =
|
||||
serveDirectoryWith . flip webAppSettingsWithLookup etag . fixPath
|
||||
|
||||
-- | Uses 'embeddedSettings'.
|
||||
serveDirectoryEmbedded :: [(FilePath, ByteString)] -> ServerT Raw m
|
||||
serveDirectoryEmbedded files = serveDirectoryWith (embeddedSettings files)
|
||||
|
||||
-- | Alias for 'staticApp'. Lets you serve a directory
|
||||
-- with arbitrary 'StaticSettings'. Useful when you want
|
||||
-- particular settings not covered by the four other
|
||||
-- variants. This is the most flexible method.
|
||||
serveDirectoryWith :: StaticSettings -> ServerT Raw m
|
||||
serveDirectoryWith = Tagged . staticApp
|
||||
|
||||
-- | Same as 'serveDirectoryFileServer'. It used to be the only
|
||||
-- file serving function in servant pre-0.10 and will be kept
|
||||
-- around for a few versions, but is deprecated.
|
||||
serveDirectory :: FilePath -> ServerT Raw m
|
||||
serveDirectory = serveDirectoryFileServer
|
||||
{-# DEPRECATED serveDirectory "Use serveDirectoryFileServer instead" #-}
|
||||
|
||||
fixPath :: FilePath -> FilePath
|
||||
fixPath =
|
||||
#if MIN_VERSION_wai_app_static(3,1,0)
|
||||
addTrailingPathSeparator
|
||||
#else
|
||||
decodeString . addTrailingPathSeparator
|
||||
#endif
|
||||
import Servant.Server.StaticFiles
|
||||
|
|
|
|||
|
|
@ -3,22 +3,31 @@
|
|||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE TypeOperators #-}
|
||||
{-# OPTIONS_GHC -fno-warn-orphans #-}
|
||||
module Servant.Utils.StaticFilesSpec where
|
||||
module Servant.Server.StaticFilesSpec where
|
||||
|
||||
import Control.Exception (bracket)
|
||||
import Data.Proxy (Proxy (Proxy))
|
||||
import Network.Wai (Application)
|
||||
import System.Directory (createDirectory,
|
||||
getCurrentDirectory,
|
||||
setCurrentDirectory)
|
||||
import System.IO.Temp (withSystemTempDirectory)
|
||||
import Test.Hspec (Spec, around_, describe, it)
|
||||
import Test.Hspec.Wai (get, shouldRespondWith, with)
|
||||
import Control.Exception
|
||||
(bracket)
|
||||
import Data.Proxy
|
||||
(Proxy (Proxy))
|
||||
import Network.Wai
|
||||
(Application)
|
||||
import System.Directory
|
||||
(createDirectory, getCurrentDirectory, setCurrentDirectory)
|
||||
import System.IO.Temp
|
||||
(withSystemTempDirectory)
|
||||
import Test.Hspec
|
||||
(Spec, around_, describe, it)
|
||||
import Test.Hspec.Wai
|
||||
(get, shouldRespondWith, with)
|
||||
|
||||
import Servant.API ((:<|>) ((:<|>)), Capture, Get, Raw, (:>), JSON)
|
||||
import Servant.Server (Server, serve)
|
||||
import Servant.ServerSpec (Person (Person))
|
||||
import Servant.Utils.StaticFiles (serveDirectoryFileServer)
|
||||
import Servant.API
|
||||
((:<|>) ((:<|>)), (:>), Capture, Get, JSON, Raw)
|
||||
import Servant.Server
|
||||
(Server, serve)
|
||||
import Servant.Server.StaticFiles
|
||||
(serveDirectoryFileServer)
|
||||
import Servant.ServerSpec
|
||||
(Person (Person))
|
||||
|
||||
type Api =
|
||||
"dummy_api" :> Capture "person_name" String :> Get '[JSON] Person
|
||||
|
|
@ -1,5 +1,18 @@
|
|||
[The latest version of this document is on GitHub.](https://github.com/haskell-servant/servant/blob/master/servant/CHANGELOG.md)
|
||||
|
||||
0.14.1
|
||||
------
|
||||
|
||||
- Merge in (and slightly refactor) `servant-generic`
|
||||
(by [Patrick Chilton](https://github.com/chpatrick))
|
||||
into `servant` (`Servant.API.Generic`),
|
||||
`servant-client-code` (`Servant.Client.Generic`)
|
||||
and `servant-server` (`Servant.Server.Generic`).
|
||||
|
||||
- Deprecate `Servant.Utils.Links`, use `Servant.Links`.
|
||||
|
||||
- *servant-server* Deprecate `Servant.Utils.StaticUtils`, use `Servant.Server.StaticUtils`.
|
||||
|
||||
0.14
|
||||
----
|
||||
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
name: servant
|
||||
version: 0.14
|
||||
version: 0.14.1
|
||||
synopsis: A family of combinators for defining webservices APIs
|
||||
description:
|
||||
A family of combinators for defining webservices APIs and serving them
|
||||
|
|
@ -46,6 +46,7 @@ library
|
|||
Servant.API.Description
|
||||
Servant.API.Empty
|
||||
Servant.API.Experimental.Auth
|
||||
Servant.API.Generic
|
||||
Servant.API.Header
|
||||
Servant.API.HttpVersion
|
||||
Servant.API.Internal.Test.ComprehensiveAPI
|
||||
|
|
@ -62,6 +63,10 @@ library
|
|||
Servant.API.Vault
|
||||
Servant.API.Verbs
|
||||
Servant.API.WithNamedContext
|
||||
Servant.Links
|
||||
|
||||
-- Deprecated modules, to be removed in late 2019
|
||||
exposed-modules:
|
||||
Servant.Utils.Links
|
||||
Servant.Utils.Enter
|
||||
|
||||
|
|
@ -133,8 +138,8 @@ test-suite spec
|
|||
other-modules:
|
||||
Servant.API.ContentTypesSpec
|
||||
Servant.API.ResponseHeadersSpec
|
||||
Servant.Utils.LinksSpec
|
||||
Servant.Utils.EnterSpec
|
||||
Servant.LinksSpec
|
||||
|
||||
-- Dependencies inherited from the library. No need to specify bounds.
|
||||
build-depends:
|
||||
|
|
@ -164,7 +169,7 @@ test-suite doctests
|
|||
build-depends:
|
||||
base
|
||||
, servant
|
||||
, doctest >= 0.15.0 && <0.16
|
||||
, doctest >= 0.15.0 && <0.17
|
||||
|
||||
-- We test Links failure with doctest, so we need extra dependencies
|
||||
build-depends:
|
||||
|
|
@ -179,4 +184,4 @@ test-suite doctests
|
|||
x-doctest-options: -fdiagnostics-color=never
|
||||
include-dirs: include
|
||||
x-doctest-source-dirs: test
|
||||
x-doctest-modules: Servant.Utils.LinksSpec
|
||||
x-doctest-modules: Servant.LinksSpec
|
||||
|
|
|
|||
|
|
@ -63,8 +63,8 @@ module Servant.API (
|
|||
module Servant.API.Experimental.Auth,
|
||||
-- | General Authentication
|
||||
|
||||
-- * Utilities
|
||||
module Servant.Utils.Links,
|
||||
-- * Links
|
||||
module Servant.Links,
|
||||
-- | Type-safe internal URIs
|
||||
|
||||
-- * Re-exports
|
||||
|
|
@ -134,7 +134,7 @@ import Servant.API.Verbs
|
|||
ReflectMethod (reflectMethod), StdMethod (..), Verb)
|
||||
import Servant.API.WithNamedContext
|
||||
(WithNamedContext)
|
||||
import Servant.Utils.Links
|
||||
import Servant.Links
|
||||
(HasLink (..), IsElem, IsElem', Link, URI (..), safeLink)
|
||||
import Web.HttpApiData
|
||||
(FromHttpApiData (..), ToHttpApiData (..))
|
||||
|
|
|
|||
146
servant/src/Servant/API/Generic.hs
Normal file
146
servant/src/Servant/API/Generic.hs
Normal file
|
|
@ -0,0 +1,146 @@
|
|||
{-# LANGUAGE ConstraintKinds #-}
|
||||
{-# LANGUAGE FlexibleContexts #-}
|
||||
{-# LANGUAGE TypeFamilies #-}
|
||||
{-# LANGUAGE TypeOperators #-}
|
||||
-- | Define servant servers from record types. Generics for the win.
|
||||
--
|
||||
-- The usage is simple, if you only need a collection of routes. First you
|
||||
-- define a record with field types prefixed by a parameter `route`:
|
||||
--
|
||||
-- @
|
||||
-- data Routes route = Routes
|
||||
-- { _get :: route :- Capture "id" Int :> Get '[JSON] String
|
||||
-- , _put :: route :- ReqBody '[JSON] Int :> Put '[JSON] Bool
|
||||
-- }
|
||||
-- deriving ('Generic')
|
||||
-- @
|
||||
--
|
||||
-- You can get a 'Proxy' of the server using
|
||||
--
|
||||
-- @
|
||||
-- api :: Proxy (ToServantApi Routes)
|
||||
-- api = genericApi (Proxy :: Proxy Routes)
|
||||
-- @
|
||||
--
|
||||
-- Using 'genericApi' is better as it checks that instances exists,
|
||||
-- i.e. you get better error messages than simply using 'Proxy' value.
|
||||
--
|
||||
-- __Note:__ in 0.14 series this module isn't re-exported from 'Servant.API'.
|
||||
--
|
||||
-- "Servant.API.Generic" is based on @servant-generic@ package by
|
||||
-- [Patrick Chilton](https://github.com/chpatrick)
|
||||
--
|
||||
-- @since 0.14.1
|
||||
module Servant.API.Generic (
|
||||
GenericMode (..),
|
||||
GenericServant,
|
||||
ToServant,
|
||||
toServant,
|
||||
fromServant,
|
||||
-- * AsApi
|
||||
AsApi,
|
||||
ToServantApi,
|
||||
genericApi,
|
||||
-- * Utility
|
||||
GServantProduct,
|
||||
-- * re-exports
|
||||
Generic (Rep),
|
||||
) where
|
||||
|
||||
-- Based on servant-generic licensed under MIT License
|
||||
--
|
||||
-- Copyright (c) 2017 Patrick Chilton
|
||||
--
|
||||
-- Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
-- of this software and associated documentation files (the "Software"), to deal
|
||||
-- in the Software without restriction, including without limitation the rights
|
||||
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
-- copies of the Software, and to permit persons to whom the Software is
|
||||
-- furnished to do so, subject to the following conditions:
|
||||
--
|
||||
-- The above copyright notice and this permission notice shall be included in all
|
||||
-- copies or substantial portions of the Software.
|
||||
--
|
||||
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
-- SOFTWARE.
|
||||
|
||||
import Data.Proxy
|
||||
(Proxy (..))
|
||||
import GHC.Generics
|
||||
((:*:) (..), Generic (..), K1 (..), M1 (..))
|
||||
|
||||
import Servant.API.Alternative
|
||||
|
||||
-- | A constraint alias, for work with 'mode' and 'routes'.
|
||||
type GenericServant routes mode = (GenericMode mode, Generic (routes mode), GServantProduct (Rep (routes mode)))
|
||||
|
||||
-- | A class with a type family that applies an appropriate type family to the @api@
|
||||
-- parameter. For example, 'AsApi' will leave @api@ untouched, while
|
||||
-- @'AsServerT' m@ will produce @'ServerT' api m@.
|
||||
class GenericMode mode where
|
||||
type mode :- api :: *
|
||||
|
||||
infixl 0 :-
|
||||
|
||||
-- | Turns a generic product type into a tree of `:<|>` combinators.
|
||||
type ToServant routes mode = GToServant (Rep (routes mode))
|
||||
|
||||
type ToServantApi routes = ToServant routes AsApi
|
||||
|
||||
-- | See `ToServant`, but at value-level.
|
||||
toServant
|
||||
:: GenericServant routes mode
|
||||
=> routes mode -> ToServant routes mode
|
||||
toServant = gtoServant . from
|
||||
|
||||
-- | Inverse of `toServant`.
|
||||
--
|
||||
-- This can be used to turn 'generated' values such as client functions into records.
|
||||
--
|
||||
-- You may need to provide a type signature for the /output/ type (your record type).
|
||||
fromServant
|
||||
:: GenericServant routes mode
|
||||
=> ToServant routes mode -> routes mode
|
||||
fromServant = to . gfromServant
|
||||
|
||||
-- | A type that specifies that an API record contains an API definition. Only useful at type-level.
|
||||
data AsApi
|
||||
instance GenericMode AsApi where
|
||||
type AsApi :- api = api
|
||||
|
||||
-- | Get a 'Proxy' of an API type.
|
||||
genericApi
|
||||
:: GenericServant routes AsApi
|
||||
=> Proxy routes
|
||||
-> Proxy (ToServantApi routes)
|
||||
genericApi _ = Proxy
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- Class
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
|
||||
class GServantProduct f where
|
||||
type GToServant f
|
||||
gtoServant :: f p -> GToServant f
|
||||
gfromServant :: GToServant f -> f p
|
||||
|
||||
instance GServantProduct f => GServantProduct (M1 i c f) where
|
||||
type GToServant (M1 i c f) = GToServant f
|
||||
gtoServant = gtoServant . unM1
|
||||
gfromServant = M1 . gfromServant
|
||||
|
||||
instance (GServantProduct l, GServantProduct r) => GServantProduct (l :*: r) where
|
||||
type GToServant (l :*: r) = GToServant l :<|> GToServant r
|
||||
gtoServant (l :*: r) = gtoServant l :<|> gtoServant r
|
||||
gfromServant (l :<|> r) = gfromServant l :*: gfromServant r
|
||||
|
||||
instance GServantProduct (K1 i c) where
|
||||
type GToServant (K1 i c) = c
|
||||
gtoServant = unK1
|
||||
gfromServant = K1
|
||||
|
|
@ -58,7 +58,7 @@ type Patch = Verb 'PATCH 200
|
|||
--
|
||||
-- If the resource cannot be created immediately, use 'PostAccepted'.
|
||||
--
|
||||
-- Consider using 'Servant.Utils.Links.safeLink' for the @Location@ header
|
||||
-- Consider using 'Servant.Links.safeLink' for the @Location@ header
|
||||
-- field.
|
||||
|
||||
-- | 'POST' with 201 status code.
|
||||
|
|
|
|||
573
servant/src/Servant/Links.hs
Normal file
573
servant/src/Servant/Links.hs
Normal file
|
|
@ -0,0 +1,573 @@
|
|||
{-# LANGUAGE ConstraintKinds #-}
|
||||
{-# LANGUAGE DataKinds #-}
|
||||
{-# LANGUAGE FlexibleContexts #-}
|
||||
{-# LANGUAGE FlexibleInstances #-}
|
||||
{-# LANGUAGE FunctionalDependencies #-}
|
||||
{-# LANGUAGE PolyKinds #-}
|
||||
{-# LANGUAGE ScopedTypeVariables #-}
|
||||
{-# LANGUAGE TypeFamilies #-}
|
||||
{-# LANGUAGE TypeOperators #-}
|
||||
{-# LANGUAGE UndecidableInstances #-}
|
||||
{-# OPTIONS_HADDOCK not-home #-}
|
||||
|
||||
-- | Type safe generation of internal links.
|
||||
--
|
||||
-- Given an API with a few endpoints:
|
||||
--
|
||||
-- >>> :set -XDataKinds -XTypeFamilies -XTypeOperators
|
||||
-- >>> import Servant.API
|
||||
-- >>> import Servant.Links
|
||||
-- >>> import Data.Proxy
|
||||
-- >>>
|
||||
-- >>> type Hello = "hello" :> Get '[JSON] Int
|
||||
-- >>> type Bye = "bye" :> QueryParam "name" String :> Delete '[JSON] NoContent
|
||||
-- >>> type API = Hello :<|> Bye
|
||||
-- >>> let api = Proxy :: Proxy API
|
||||
--
|
||||
-- It is possible to generate links that are guaranteed to be within 'API' with
|
||||
-- 'safeLink'. The first argument to 'safeLink' is a type representing the API
|
||||
-- you would like to restrict links to. The second argument is the destination
|
||||
-- endpoint you would like the link to point to, this will need to end with a
|
||||
-- verb like GET or POST. Further arguments may be required depending on the
|
||||
-- type of the endpoint. If everything lines up you will get a 'Link' out the
|
||||
-- other end.
|
||||
--
|
||||
-- You may omit 'QueryParam's and the like should you not want to provide them,
|
||||
-- but types which form part of the URL path like 'Capture' must be included.
|
||||
-- The reason you may want to omit 'QueryParam's is that safeLink is a bit
|
||||
-- magical: if parameters are included that could take input it will return a
|
||||
-- function that accepts that input and generates a link. This is best shown
|
||||
-- with an example. Here, a link is generated with no parameters:
|
||||
--
|
||||
-- >>> let hello = Proxy :: Proxy ("hello" :> Get '[JSON] Int)
|
||||
-- >>> toUrlPiece (safeLink api hello :: Link)
|
||||
-- "hello"
|
||||
--
|
||||
-- If the API has an endpoint with parameters then we can generate links with
|
||||
-- or without those:
|
||||
--
|
||||
-- >>> let with = Proxy :: Proxy ("bye" :> QueryParam "name" String :> Delete '[JSON] NoContent)
|
||||
-- >>> toUrlPiece $ safeLink api with (Just "Hubert")
|
||||
-- "bye?name=Hubert"
|
||||
--
|
||||
-- >>> let without = Proxy :: Proxy ("bye" :> Delete '[JSON] NoContent)
|
||||
-- >>> toUrlPiece $ safeLink api without
|
||||
-- "bye"
|
||||
--
|
||||
-- If you would like create a helper for generating links only within that API,
|
||||
-- you can partially apply safeLink if you specify a correct type signature
|
||||
-- like so:
|
||||
--
|
||||
-- >>> :set -XConstraintKinds
|
||||
-- >>> :{
|
||||
-- >>> let apiLink :: (IsElem endpoint API, HasLink endpoint)
|
||||
-- >>> => Proxy endpoint -> MkLink endpoint Link
|
||||
-- >>> apiLink = safeLink api
|
||||
-- >>> :}
|
||||
--
|
||||
-- `safeLink'` allows to make specialise the output:
|
||||
--
|
||||
-- >>> safeLink' toUrlPiece api without
|
||||
-- "bye"
|
||||
--
|
||||
-- >>> :{
|
||||
-- >>> let apiTextLink :: (IsElem endpoint API, HasLink endpoint)
|
||||
-- >>> => Proxy endpoint -> MkLink endpoint Text
|
||||
-- >>> apiTextLink = safeLink' toUrlPiece api
|
||||
-- >>> :}
|
||||
--
|
||||
-- >>> apiTextLink without
|
||||
-- "bye"
|
||||
--
|
||||
-- Attempting to construct a link to an endpoint that does not exist in api
|
||||
-- will result in a type error like this:
|
||||
--
|
||||
-- >>> let bad_link = Proxy :: Proxy ("hello" :> Delete '[JSON] NoContent)
|
||||
-- >>> safeLink api bad_link
|
||||
-- ...
|
||||
-- ...Could not deduce...
|
||||
-- ...
|
||||
--
|
||||
-- This error is essentially saying that the type family couldn't find
|
||||
-- bad_link under api after trying the open (but empty) type family
|
||||
-- `IsElem'` as a last resort.
|
||||
--
|
||||
-- @since 0.14.1
|
||||
module Servant.Links (
|
||||
module Servant.API.TypeLevel,
|
||||
|
||||
-- * Building and using safe links
|
||||
--
|
||||
-- | Note that 'URI' is from the "Network.URI" module in the @network-uri@ package.
|
||||
safeLink
|
||||
, safeLink'
|
||||
, allLinks
|
||||
, allLinks'
|
||||
, URI(..)
|
||||
-- * Generics
|
||||
, AsLink
|
||||
, fieldLink
|
||||
, fieldLink'
|
||||
, allFieldLinks
|
||||
, allFieldLinks'
|
||||
-- * Adding custom types
|
||||
, HasLink(..)
|
||||
, Link
|
||||
, linkURI
|
||||
, linkURI'
|
||||
, LinkArrayElementStyle (..)
|
||||
-- ** Link accessors
|
||||
, Param (..)
|
||||
, linkSegments
|
||||
, linkQueryParams
|
||||
) where
|
||||
|
||||
import Data.List
|
||||
import Data.Proxy
|
||||
(Proxy (..))
|
||||
import Data.Semigroup
|
||||
((<>))
|
||||
import Data.Singletons.Bool
|
||||
(SBool (..), SBoolI (..))
|
||||
import qualified Data.Text as Text
|
||||
import qualified Data.Text.Encoding as TE
|
||||
import Data.Type.Bool
|
||||
(If)
|
||||
import GHC.TypeLits
|
||||
(KnownSymbol, symbolVal)
|
||||
import Network.URI
|
||||
(URI (..), escapeURIString, isUnreserved)
|
||||
import Prelude ()
|
||||
import Prelude.Compat
|
||||
|
||||
import Servant.API.Alternative
|
||||
((:<|>) ((:<|>)))
|
||||
import Servant.API.BasicAuth
|
||||
(BasicAuth)
|
||||
import Servant.API.Capture
|
||||
(Capture', CaptureAll)
|
||||
import Servant.API.Description
|
||||
(Description, Summary)
|
||||
import Servant.API.Empty
|
||||
(EmptyAPI (..))
|
||||
import Servant.API.Experimental.Auth
|
||||
(AuthProtect)
|
||||
import Servant.API.Generic
|
||||
import Servant.API.Header
|
||||
(Header')
|
||||
import Servant.API.HttpVersion
|
||||
(HttpVersion)
|
||||
import Servant.API.IsSecure
|
||||
(IsSecure)
|
||||
import Servant.API.Modifiers
|
||||
(FoldRequired)
|
||||
import Servant.API.QueryParam
|
||||
(QueryFlag, QueryParam', QueryParams)
|
||||
import Servant.API.Raw
|
||||
(Raw)
|
||||
import Servant.API.RemoteHost
|
||||
(RemoteHost)
|
||||
import Servant.API.ReqBody
|
||||
(ReqBody')
|
||||
import Servant.API.Stream
|
||||
(Stream)
|
||||
import Servant.API.Sub
|
||||
(type (:>))
|
||||
import Servant.API.TypeLevel
|
||||
import Servant.API.Vault
|
||||
(Vault)
|
||||
import Servant.API.Verbs
|
||||
(Verb)
|
||||
import Servant.API.WithNamedContext
|
||||
(WithNamedContext)
|
||||
import Web.HttpApiData
|
||||
|
||||
-- | A safe link datatype.
|
||||
-- The only way of constructing a 'Link' is using 'safeLink', which means any
|
||||
-- 'Link' is guaranteed to be part of the mentioned API.
|
||||
data Link = Link
|
||||
{ _segments :: [Escaped]
|
||||
, _queryParams :: [Param]
|
||||
} deriving Show
|
||||
|
||||
newtype Escaped = Escaped String
|
||||
|
||||
escaped :: String -> Escaped
|
||||
escaped = Escaped . escapeURIString isUnreserved
|
||||
|
||||
getEscaped :: Escaped -> String
|
||||
getEscaped (Escaped s) = s
|
||||
|
||||
instance Show Escaped where
|
||||
showsPrec d (Escaped s) = showsPrec d s
|
||||
show (Escaped s) = show s
|
||||
|
||||
linkSegments :: Link -> [String]
|
||||
linkSegments = map getEscaped . _segments
|
||||
|
||||
linkQueryParams :: Link -> [Param]
|
||||
linkQueryParams = _queryParams
|
||||
|
||||
instance ToHttpApiData Link where
|
||||
toHeader = TE.encodeUtf8 . toUrlPiece
|
||||
toUrlPiece l =
|
||||
let uri = linkURI l
|
||||
in Text.pack $ uriPath uri ++ uriQuery uri
|
||||
|
||||
-- | Query parameter.
|
||||
data Param
|
||||
= SingleParam String Text.Text
|
||||
| ArrayElemParam String Text.Text
|
||||
| FlagParam String
|
||||
deriving Show
|
||||
|
||||
addSegment :: Escaped -> Link -> Link
|
||||
addSegment seg l = l { _segments = _segments l <> [seg] }
|
||||
|
||||
addQueryParam :: Param -> Link -> Link
|
||||
addQueryParam qp l =
|
||||
l { _queryParams = _queryParams l <> [qp] }
|
||||
|
||||
-- | Transform 'Link' into 'URI'.
|
||||
--
|
||||
-- >>> type API = "something" :> Get '[JSON] Int
|
||||
-- >>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API)
|
||||
-- something
|
||||
--
|
||||
-- >>> type API = "sum" :> QueryParams "x" Int :> Get '[JSON] Int
|
||||
-- >>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
|
||||
-- sum?x[]=1&x[]=2&x[]=3
|
||||
--
|
||||
-- >>> type API = "foo/bar" :> Get '[JSON] Int
|
||||
-- >>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API)
|
||||
-- foo%2Fbar
|
||||
--
|
||||
-- >>> type SomeRoute = "abc" :> Capture "email" String :> Put '[JSON] ()
|
||||
-- >>> let someRoute = Proxy :: Proxy SomeRoute
|
||||
-- >>> safeLink someRoute someRoute "test@example.com"
|
||||
-- Link {_segments = ["abc","test%40example.com"], _queryParams = []}
|
||||
--
|
||||
-- >>> linkURI $ safeLink someRoute someRoute "test@example.com"
|
||||
-- abc/test%40example.com
|
||||
--
|
||||
linkURI :: Link -> URI
|
||||
linkURI = linkURI' LinkArrayElementBracket
|
||||
|
||||
-- | How to encode array query elements.
|
||||
data LinkArrayElementStyle
|
||||
= LinkArrayElementBracket -- ^ @foo[]=1&foo[]=2@
|
||||
| LinkArrayElementPlain -- ^ @foo=1&foo=2@
|
||||
deriving (Eq, Ord, Show, Enum, Bounded)
|
||||
|
||||
-- | Configurable 'linkURI'.
|
||||
--
|
||||
-- >>> type API = "sum" :> QueryParams "x" Int :> Get '[JSON] Int
|
||||
-- >>> linkURI' LinkArrayElementBracket $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
|
||||
-- sum?x[]=1&x[]=2&x[]=3
|
||||
--
|
||||
-- >>> linkURI' LinkArrayElementPlain $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
|
||||
-- sum?x=1&x=2&x=3
|
||||
--
|
||||
linkURI' :: LinkArrayElementStyle -> Link -> URI
|
||||
linkURI' addBrackets (Link segments q_params) =
|
||||
URI mempty -- No scheme (relative)
|
||||
Nothing -- Or authority (relative)
|
||||
(intercalate "/" $ map getEscaped segments)
|
||||
(makeQueries q_params) mempty
|
||||
where
|
||||
makeQueries :: [Param] -> String
|
||||
makeQueries [] = ""
|
||||
makeQueries xs =
|
||||
"?" <> intercalate "&" (fmap makeQuery xs)
|
||||
|
||||
makeQuery :: Param -> String
|
||||
makeQuery (ArrayElemParam k v) = escape k <> style <> escape (Text.unpack v)
|
||||
makeQuery (SingleParam k v) = escape k <> "=" <> escape (Text.unpack v)
|
||||
makeQuery (FlagParam k) = escape k
|
||||
|
||||
style = case addBrackets of
|
||||
LinkArrayElementBracket -> "[]="
|
||||
LinkArrayElementPlain -> "="
|
||||
|
||||
escape :: String -> String
|
||||
escape = escapeURIString isUnreserved
|
||||
|
||||
-- | Create a valid (by construction) relative URI with query params.
|
||||
--
|
||||
-- This function will only typecheck if `endpoint` is part of the API `api`
|
||||
safeLink
|
||||
:: forall endpoint api. (IsElem endpoint api, HasLink endpoint)
|
||||
=> Proxy api -- ^ The whole API that this endpoint is a part of
|
||||
-> Proxy endpoint -- ^ The API endpoint you would like to point to
|
||||
-> MkLink endpoint Link
|
||||
safeLink = safeLink' id
|
||||
|
||||
-- | More general 'safeLink'.
|
||||
--
|
||||
safeLink'
|
||||
:: forall endpoint api a. (IsElem endpoint api, HasLink endpoint)
|
||||
=> (Link -> a)
|
||||
-> Proxy api -- ^ The whole API that this endpoint is a part of
|
||||
-> Proxy endpoint -- ^ The API endpoint you would like to point to
|
||||
-> MkLink endpoint a
|
||||
safeLink' toA _ endpoint = toLink toA endpoint (Link mempty mempty)
|
||||
|
||||
-- | Create all links in an API.
|
||||
--
|
||||
-- Note that the @api@ type must be restricted to the endpoints that have
|
||||
-- valid links to them.
|
||||
--
|
||||
-- >>> type API = "foo" :> Capture "name" Text :> Get '[JSON] Text :<|> "bar" :> Capture "name" Int :> Get '[JSON] Double
|
||||
-- >>> let fooLink :<|> barLink = allLinks (Proxy :: Proxy API)
|
||||
-- >>> :t fooLink
|
||||
-- fooLink :: Text -> Link
|
||||
-- >>> :t barLink
|
||||
-- barLink :: Int -> Link
|
||||
--
|
||||
-- Note: nested APIs don't work well with this approach
|
||||
--
|
||||
-- >>> :kind! MkLink (Capture "nest" Char :> (Capture "x" Int :> Get '[JSON] Int :<|> Capture "y" Double :> Get '[JSON] Double)) Link
|
||||
-- MkLink (Capture "nest" Char :> (Capture "x" Int :> Get '[JSON] Int :<|> Capture "y" Double :> Get '[JSON] Double)) Link :: *
|
||||
-- = Char -> (Int -> Link) :<|> (Double -> Link)
|
||||
allLinks
|
||||
:: forall api. HasLink api
|
||||
=> Proxy api
|
||||
-> MkLink api Link
|
||||
allLinks = allLinks' id
|
||||
|
||||
-- | More general 'allLinks'. See `safeLink'`.
|
||||
allLinks'
|
||||
:: forall api a. HasLink api
|
||||
=> (Link -> a)
|
||||
-> Proxy api
|
||||
-> MkLink api a
|
||||
allLinks' toA api = toLink toA api (Link mempty mempty)
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- Generics
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
-- | Given an API record field, create a link for that route. Only the field's
|
||||
-- type is used.
|
||||
--
|
||||
-- @
|
||||
-- data Record route = Record
|
||||
-- { _get :: route :- Capture "id" Int :> Get '[JSON] String
|
||||
-- , _put :: route :- ReqBody '[JSON] Int :> Put '[JSON] Bool
|
||||
-- }
|
||||
-- deriving ('Generic')
|
||||
--
|
||||
-- getLink :: Int -> Link
|
||||
-- getLink = 'fieldLink' _get
|
||||
-- @
|
||||
--
|
||||
-- @since 0.14.1
|
||||
fieldLink
|
||||
:: ( IsElem endpoint (ToServantApi routes), HasLink endpoint
|
||||
, GenericServant routes AsApi
|
||||
)
|
||||
=> (routes AsApi -> endpoint)
|
||||
-> MkLink endpoint Link
|
||||
fieldLink = fieldLink' id
|
||||
|
||||
-- | More general version of 'fieldLink'
|
||||
--
|
||||
-- @since 0.14.1
|
||||
fieldLink'
|
||||
:: forall routes endpoint a.
|
||||
( IsElem endpoint (ToServantApi routes), HasLink endpoint
|
||||
, GenericServant routes AsApi
|
||||
)
|
||||
=> (Link -> a)
|
||||
-> (routes AsApi -> endpoint)
|
||||
-> MkLink endpoint a
|
||||
fieldLink' toA _ = safeLink' toA (genericApi (Proxy :: Proxy routes)) (Proxy :: Proxy endpoint)
|
||||
|
||||
-- | A type that specifies that an API record contains a set of links.
|
||||
--
|
||||
-- @since 0.14.1
|
||||
data AsLink (a :: *)
|
||||
instance GenericMode (AsLink a) where
|
||||
type (AsLink a) :- api = MkLink api a
|
||||
|
||||
-- | Get all links as a record.
|
||||
--
|
||||
-- @since 0.14.1
|
||||
allFieldLinks
|
||||
:: ( HasLink (ToServantApi routes)
|
||||
, GenericServant routes (AsLink Link)
|
||||
, ToServant routes (AsLink Link) ~ MkLink (ToServantApi routes) Link
|
||||
)
|
||||
=> routes (AsLink Link)
|
||||
allFieldLinks = allFieldLinks' id
|
||||
|
||||
-- | More general version of 'allFieldLinks'.
|
||||
--
|
||||
-- @since 0.14.1
|
||||
allFieldLinks'
|
||||
:: forall routes a.
|
||||
( HasLink (ToServantApi routes)
|
||||
, GenericServant routes (AsLink a)
|
||||
, ToServant routes (AsLink a) ~ MkLink (ToServantApi routes) a
|
||||
)
|
||||
=> (Link -> a)
|
||||
-> routes (AsLink a)
|
||||
allFieldLinks' toA
|
||||
= fromServant
|
||||
$ allLinks' toA (Proxy :: Proxy (ToServantApi routes))
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- HasLink
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
-- | Construct a toLink for an endpoint.
|
||||
class HasLink endpoint where
|
||||
type MkLink endpoint (a :: *)
|
||||
toLink
|
||||
:: (Link -> a)
|
||||
-> Proxy endpoint -- ^ The API endpoint you would like to point to
|
||||
-> Link
|
||||
-> MkLink endpoint a
|
||||
|
||||
-- Naked symbol instance
|
||||
instance (KnownSymbol sym, HasLink sub) => HasLink (sym :> sub) where
|
||||
type MkLink (sym :> sub) a = MkLink sub a
|
||||
toLink toA _ =
|
||||
toLink toA (Proxy :: Proxy sub) . addSegment (escaped seg)
|
||||
where
|
||||
seg = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
-- QueryParam instances
|
||||
instance (KnownSymbol sym, ToHttpApiData v, HasLink sub, SBoolI (FoldRequired mods))
|
||||
=> HasLink (QueryParam' mods sym v :> sub)
|
||||
where
|
||||
type MkLink (QueryParam' mods sym v :> sub) a = If (FoldRequired mods) v (Maybe v) -> MkLink sub a
|
||||
toLink toA _ l mv =
|
||||
toLink toA (Proxy :: Proxy sub) $
|
||||
case sbool :: SBool (FoldRequired mods) of
|
||||
STrue -> (addQueryParam . SingleParam k . toQueryParam) mv l
|
||||
SFalse -> maybe id (addQueryParam . SingleParam k . toQueryParam) mv l
|
||||
where
|
||||
k :: String
|
||||
k = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
instance (KnownSymbol sym, ToHttpApiData v, HasLink sub)
|
||||
=> HasLink (QueryParams sym v :> sub)
|
||||
where
|
||||
type MkLink (QueryParams sym v :> sub) a = [v] -> MkLink sub a
|
||||
toLink toA _ l =
|
||||
toLink toA (Proxy :: Proxy sub) .
|
||||
foldl' (\l' v -> addQueryParam (ArrayElemParam k (toQueryParam v)) l') l
|
||||
where
|
||||
k = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
instance (KnownSymbol sym, HasLink sub)
|
||||
=> HasLink (QueryFlag sym :> sub)
|
||||
where
|
||||
type MkLink (QueryFlag sym :> sub) a = Bool -> MkLink sub a
|
||||
toLink toA _ l False =
|
||||
toLink toA (Proxy :: Proxy sub) l
|
||||
toLink toA _ l True =
|
||||
toLink toA (Proxy :: Proxy sub) $ addQueryParam (FlagParam k) l
|
||||
where
|
||||
k = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
-- :<|> instance - Generate all links at once
|
||||
instance (HasLink a, HasLink b) => HasLink (a :<|> b) where
|
||||
type MkLink (a :<|> b) r = MkLink a r :<|> MkLink b r
|
||||
toLink toA _ l = toLink toA (Proxy :: Proxy a) l :<|> toLink toA (Proxy :: Proxy b) l
|
||||
|
||||
-- Misc instances
|
||||
instance HasLink sub => HasLink (ReqBody' mods ct a :> sub) where
|
||||
type MkLink (ReqBody' mods ct a :> sub) r = MkLink sub r
|
||||
toLink toA _ = toLink toA (Proxy :: Proxy sub)
|
||||
|
||||
instance (ToHttpApiData v, HasLink sub)
|
||||
=> HasLink (Capture' mods sym v :> sub)
|
||||
where
|
||||
type MkLink (Capture' mods sym v :> sub) a = v -> MkLink sub a
|
||||
toLink toA _ l v =
|
||||
toLink toA (Proxy :: Proxy sub) $
|
||||
addSegment (escaped . Text.unpack $ toUrlPiece v) l
|
||||
|
||||
instance (ToHttpApiData v, HasLink sub)
|
||||
=> HasLink (CaptureAll sym v :> sub)
|
||||
where
|
||||
type MkLink (CaptureAll sym v :> sub) a = [v] -> MkLink sub a
|
||||
toLink toA _ l vs = toLink toA (Proxy :: Proxy sub) $
|
||||
foldl' (flip $ addSegment . escaped . Text.unpack . toUrlPiece) l vs
|
||||
|
||||
instance HasLink sub => HasLink (Header' mods sym (a :: *) :> sub) where
|
||||
type MkLink (Header' mods sym a :> sub) r = MkLink sub r
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (Vault :> sub) where
|
||||
type MkLink (Vault :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (Description s :> sub) where
|
||||
type MkLink (Description s :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (Summary s :> sub) where
|
||||
type MkLink (Summary s :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (HttpVersion :> sub) where
|
||||
type MkLink (HttpVersion:> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (IsSecure :> sub) where
|
||||
type MkLink (IsSecure :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (WithNamedContext name context sub) where
|
||||
type MkLink (WithNamedContext name context sub) a = MkLink sub a
|
||||
toLink toA _ = toLink toA (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (RemoteHost :> sub) where
|
||||
type MkLink (RemoteHost :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (BasicAuth realm a :> sub) where
|
||||
type MkLink (BasicAuth realm a :> sub) r = MkLink sub r
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink EmptyAPI where
|
||||
type MkLink EmptyAPI a = EmptyAPI
|
||||
toLink _ _ _ = EmptyAPI
|
||||
|
||||
-- Verb (terminal) instances
|
||||
instance HasLink (Verb m s ct a) where
|
||||
type MkLink (Verb m s ct a) r = r
|
||||
toLink toA _ = toA
|
||||
|
||||
instance HasLink Raw where
|
||||
type MkLink Raw a = a
|
||||
toLink toA _ = toA
|
||||
|
||||
instance HasLink (Stream m status fr ct a) where
|
||||
type MkLink (Stream m status fr ct a) r = r
|
||||
toLink toA _ = toA
|
||||
|
||||
-- AuthProtext instances
|
||||
instance HasLink sub => HasLink (AuthProtect tag :> sub) where
|
||||
type MkLink (AuthProtect tag :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
-- | Helper for implemneting 'toLink' for combinators not affecting link
|
||||
-- structure.
|
||||
simpleToLink
|
||||
:: forall sub a combinator.
|
||||
(HasLink sub, MkLink sub a ~ MkLink (combinator :> sub) a)
|
||||
=> Proxy sub
|
||||
-> (Link -> a)
|
||||
-> Proxy (combinator :> sub)
|
||||
-> Link
|
||||
-> MkLink (combinator :> sub) a
|
||||
simpleToLink _ toA _ = toLink toA (Proxy :: Proxy sub)
|
||||
|
||||
|
||||
-- $setup
|
||||
-- >>> import Servant.API
|
||||
-- >>> import Data.Text (Text)
|
||||
|
|
@ -1,487 +1,6 @@
|
|||
{-# LANGUAGE ConstraintKinds #-}
|
||||
{-# LANGUAGE DataKinds #-}
|
||||
{-# LANGUAGE FlexibleContexts #-}
|
||||
{-# LANGUAGE FlexibleInstances #-}
|
||||
{-# LANGUAGE FunctionalDependencies #-}
|
||||
{-# LANGUAGE PolyKinds #-}
|
||||
{-# LANGUAGE ScopedTypeVariables #-}
|
||||
{-# LANGUAGE TypeFamilies #-}
|
||||
{-# LANGUAGE TypeOperators #-}
|
||||
{-# LANGUAGE UndecidableInstances #-}
|
||||
{-# OPTIONS_HADDOCK not-home #-}
|
||||
|
||||
-- | Type safe generation of internal links.
|
||||
--
|
||||
-- Given an API with a few endpoints:
|
||||
--
|
||||
-- >>> :set -XDataKinds -XTypeFamilies -XTypeOperators
|
||||
-- >>> import Servant.API
|
||||
-- >>> import Servant.Utils.Links
|
||||
-- >>> import Data.Proxy
|
||||
-- >>>
|
||||
-- >>> type Hello = "hello" :> Get '[JSON] Int
|
||||
-- >>> type Bye = "bye" :> QueryParam "name" String :> Delete '[JSON] NoContent
|
||||
-- >>> type API = Hello :<|> Bye
|
||||
-- >>> let api = Proxy :: Proxy API
|
||||
--
|
||||
-- It is possible to generate links that are guaranteed to be within 'API' with
|
||||
-- 'safeLink'. The first argument to 'safeLink' is a type representing the API
|
||||
-- you would like to restrict links to. The second argument is the destination
|
||||
-- endpoint you would like the link to point to, this will need to end with a
|
||||
-- verb like GET or POST. Further arguments may be required depending on the
|
||||
-- type of the endpoint. If everything lines up you will get a 'Link' out the
|
||||
-- other end.
|
||||
--
|
||||
-- You may omit 'QueryParam's and the like should you not want to provide them,
|
||||
-- but types which form part of the URL path like 'Capture' must be included.
|
||||
-- The reason you may want to omit 'QueryParam's is that safeLink is a bit
|
||||
-- magical: if parameters are included that could take input it will return a
|
||||
-- function that accepts that input and generates a link. This is best shown
|
||||
-- with an example. Here, a link is generated with no parameters:
|
||||
--
|
||||
-- >>> let hello = Proxy :: Proxy ("hello" :> Get '[JSON] Int)
|
||||
-- >>> toUrlPiece (safeLink api hello :: Link)
|
||||
-- "hello"
|
||||
--
|
||||
-- If the API has an endpoint with parameters then we can generate links with
|
||||
-- or without those:
|
||||
--
|
||||
-- >>> let with = Proxy :: Proxy ("bye" :> QueryParam "name" String :> Delete '[JSON] NoContent)
|
||||
-- >>> toUrlPiece $ safeLink api with (Just "Hubert")
|
||||
-- "bye?name=Hubert"
|
||||
--
|
||||
-- >>> let without = Proxy :: Proxy ("bye" :> Delete '[JSON] NoContent)
|
||||
-- >>> toUrlPiece $ safeLink api without
|
||||
-- "bye"
|
||||
--
|
||||
-- If you would like create a helper for generating links only within that API,
|
||||
-- you can partially apply safeLink if you specify a correct type signature
|
||||
-- like so:
|
||||
--
|
||||
-- >>> :set -XConstraintKinds
|
||||
-- >>> :{
|
||||
-- >>> let apiLink :: (IsElem endpoint API, HasLink endpoint)
|
||||
-- >>> => Proxy endpoint -> MkLink endpoint Link
|
||||
-- >>> apiLink = safeLink api
|
||||
-- >>> :}
|
||||
--
|
||||
-- `safeLink'` allows to make specialise the output:
|
||||
--
|
||||
-- >>> safeLink' toUrlPiece api without
|
||||
-- "bye"
|
||||
--
|
||||
-- >>> :{
|
||||
-- >>> let apiTextLink :: (IsElem endpoint API, HasLink endpoint)
|
||||
-- >>> => Proxy endpoint -> MkLink endpoint Text
|
||||
-- >>> apiTextLink = safeLink' toUrlPiece api
|
||||
-- >>> :}
|
||||
--
|
||||
-- >>> apiTextLink without
|
||||
-- "bye"
|
||||
--
|
||||
-- Attempting to construct a link to an endpoint that does not exist in api
|
||||
-- will result in a type error like this:
|
||||
--
|
||||
-- >>> let bad_link = Proxy :: Proxy ("hello" :> Delete '[JSON] NoContent)
|
||||
-- >>> safeLink api bad_link
|
||||
-- ...
|
||||
-- ...Could not deduce...
|
||||
-- ...
|
||||
--
|
||||
-- This error is essentially saying that the type family couldn't find
|
||||
-- bad_link under api after trying the open (but empty) type family
|
||||
-- `IsElem'` as a last resort.
|
||||
module Servant.Utils.Links (
|
||||
module Servant.API.TypeLevel,
|
||||
|
||||
-- * Building and using safe links
|
||||
--
|
||||
-- | Note that 'URI' is from the "Network.URI" module in the @network-uri@ package.
|
||||
safeLink
|
||||
, safeLink'
|
||||
, allLinks
|
||||
, allLinks'
|
||||
, URI(..)
|
||||
-- * Adding custom types
|
||||
, HasLink(..)
|
||||
, Link
|
||||
, linkURI
|
||||
, linkURI'
|
||||
, LinkArrayElementStyle (..)
|
||||
-- ** Link accessors
|
||||
, Param (..)
|
||||
, linkSegments
|
||||
, linkQueryParams
|
||||
) where
|
||||
|
||||
import Data.List
|
||||
import Data.Proxy
|
||||
(Proxy (..))
|
||||
import Data.Semigroup
|
||||
((<>))
|
||||
import Data.Singletons.Bool
|
||||
(SBool (..), SBoolI (..))
|
||||
import qualified Data.Text as Text
|
||||
import qualified Data.Text.Encoding as TE
|
||||
import Data.Type.Bool
|
||||
(If)
|
||||
import GHC.TypeLits
|
||||
(KnownSymbol, symbolVal)
|
||||
import Network.URI
|
||||
(URI (..), escapeURIString, isUnreserved)
|
||||
import Prelude ()
|
||||
import Prelude.Compat
|
||||
|
||||
import Servant.API.Alternative
|
||||
((:<|>) ((:<|>)))
|
||||
import Servant.API.BasicAuth
|
||||
(BasicAuth)
|
||||
import Servant.API.Capture
|
||||
(Capture', CaptureAll)
|
||||
import Servant.API.Description
|
||||
(Description, Summary)
|
||||
import Servant.API.Empty
|
||||
(EmptyAPI (..))
|
||||
import Servant.API.Experimental.Auth
|
||||
(AuthProtect)
|
||||
import Servant.API.Header
|
||||
(Header')
|
||||
import Servant.API.HttpVersion
|
||||
(HttpVersion)
|
||||
import Servant.API.IsSecure
|
||||
(IsSecure)
|
||||
import Servant.API.Modifiers
|
||||
(FoldRequired)
|
||||
import Servant.API.QueryParam
|
||||
(QueryFlag, QueryParam', QueryParams)
|
||||
import Servant.API.Raw
|
||||
(Raw)
|
||||
import Servant.API.RemoteHost
|
||||
(RemoteHost)
|
||||
import Servant.API.ReqBody
|
||||
(ReqBody')
|
||||
import Servant.API.Stream
|
||||
(Stream)
|
||||
import Servant.API.Sub
|
||||
(type (:>))
|
||||
import Servant.API.TypeLevel
|
||||
import Servant.API.Vault
|
||||
(Vault)
|
||||
import Servant.API.Verbs
|
||||
(Verb)
|
||||
import Servant.API.WithNamedContext
|
||||
(WithNamedContext)
|
||||
import Web.HttpApiData
|
||||
|
||||
-- | A safe link datatype.
|
||||
-- The only way of constructing a 'Link' is using 'safeLink', which means any
|
||||
-- 'Link' is guaranteed to be part of the mentioned API.
|
||||
data Link = Link
|
||||
{ _segments :: [Escaped]
|
||||
, _queryParams :: [Param]
|
||||
} deriving Show
|
||||
|
||||
newtype Escaped = Escaped String
|
||||
|
||||
escaped :: String -> Escaped
|
||||
escaped = Escaped . escapeURIString isUnreserved
|
||||
|
||||
getEscaped :: Escaped -> String
|
||||
getEscaped (Escaped s) = s
|
||||
|
||||
instance Show Escaped where
|
||||
showsPrec d (Escaped s) = showsPrec d s
|
||||
show (Escaped s) = show s
|
||||
|
||||
linkSegments :: Link -> [String]
|
||||
linkSegments = map getEscaped . _segments
|
||||
|
||||
linkQueryParams :: Link -> [Param]
|
||||
linkQueryParams = _queryParams
|
||||
|
||||
instance ToHttpApiData Link where
|
||||
toHeader = TE.encodeUtf8 . toUrlPiece
|
||||
toUrlPiece l =
|
||||
let uri = linkURI l
|
||||
in Text.pack $ uriPath uri ++ uriQuery uri
|
||||
|
||||
-- | Query parameter.
|
||||
data Param
|
||||
= SingleParam String Text.Text
|
||||
| ArrayElemParam String Text.Text
|
||||
| FlagParam String
|
||||
deriving Show
|
||||
|
||||
addSegment :: Escaped -> Link -> Link
|
||||
addSegment seg l = l { _segments = _segments l <> [seg] }
|
||||
|
||||
addQueryParam :: Param -> Link -> Link
|
||||
addQueryParam qp l =
|
||||
l { _queryParams = _queryParams l <> [qp] }
|
||||
|
||||
-- | Transform 'Link' into 'URI'.
|
||||
--
|
||||
-- >>> type API = "something" :> Get '[JSON] Int
|
||||
-- >>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API)
|
||||
-- something
|
||||
--
|
||||
-- >>> type API = "sum" :> QueryParams "x" Int :> Get '[JSON] Int
|
||||
-- >>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
|
||||
-- sum?x[]=1&x[]=2&x[]=3
|
||||
--
|
||||
-- >>> type API = "foo/bar" :> Get '[JSON] Int
|
||||
-- >>> linkURI $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API)
|
||||
-- foo%2Fbar
|
||||
--
|
||||
-- >>> type SomeRoute = "abc" :> Capture "email" String :> Put '[JSON] ()
|
||||
-- >>> let someRoute = Proxy :: Proxy SomeRoute
|
||||
-- >>> safeLink someRoute someRoute "test@example.com"
|
||||
-- Link {_segments = ["abc","test%40example.com"], _queryParams = []}
|
||||
--
|
||||
-- >>> linkURI $ safeLink someRoute someRoute "test@example.com"
|
||||
-- abc/test%40example.com
|
||||
--
|
||||
linkURI :: Link -> URI
|
||||
linkURI = linkURI' LinkArrayElementBracket
|
||||
|
||||
-- | How to encode array query elements.
|
||||
data LinkArrayElementStyle
|
||||
= LinkArrayElementBracket -- ^ @foo[]=1&foo[]=2@
|
||||
| LinkArrayElementPlain -- ^ @foo=1&foo=2@
|
||||
deriving (Eq, Ord, Show, Enum, Bounded)
|
||||
|
||||
-- | Configurable 'linkURI'.
|
||||
--
|
||||
-- >>> type API = "sum" :> QueryParams "x" Int :> Get '[JSON] Int
|
||||
-- >>> linkURI' LinkArrayElementBracket $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
|
||||
-- sum?x[]=1&x[]=2&x[]=3
|
||||
--
|
||||
-- >>> linkURI' LinkArrayElementPlain $ safeLink (Proxy :: Proxy API) (Proxy :: Proxy API) [1, 2, 3]
|
||||
-- sum?x=1&x=2&x=3
|
||||
--
|
||||
linkURI' :: LinkArrayElementStyle -> Link -> URI
|
||||
linkURI' addBrackets (Link segments q_params) =
|
||||
URI mempty -- No scheme (relative)
|
||||
Nothing -- Or authority (relative)
|
||||
(intercalate "/" $ map getEscaped segments)
|
||||
(makeQueries q_params) mempty
|
||||
module Servant.Utils.Links
|
||||
{-# DEPRECATED "Use Servant.Links." #-}
|
||||
( module Servant.Links )
|
||||
where
|
||||
makeQueries :: [Param] -> String
|
||||
makeQueries [] = ""
|
||||
makeQueries xs =
|
||||
"?" <> intercalate "&" (fmap makeQuery xs)
|
||||
|
||||
makeQuery :: Param -> String
|
||||
makeQuery (ArrayElemParam k v) = escape k <> style <> escape (Text.unpack v)
|
||||
makeQuery (SingleParam k v) = escape k <> "=" <> escape (Text.unpack v)
|
||||
makeQuery (FlagParam k) = escape k
|
||||
|
||||
style = case addBrackets of
|
||||
LinkArrayElementBracket -> "[]="
|
||||
LinkArrayElementPlain -> "="
|
||||
|
||||
escape :: String -> String
|
||||
escape = escapeURIString isUnreserved
|
||||
|
||||
-- | Create a valid (by construction) relative URI with query params.
|
||||
--
|
||||
-- This function will only typecheck if `endpoint` is part of the API `api`
|
||||
safeLink
|
||||
:: forall endpoint api. (IsElem endpoint api, HasLink endpoint)
|
||||
=> Proxy api -- ^ The whole API that this endpoint is a part of
|
||||
-> Proxy endpoint -- ^ The API endpoint you would like to point to
|
||||
-> MkLink endpoint Link
|
||||
safeLink = safeLink' id
|
||||
|
||||
-- | More general 'safeLink'.
|
||||
--
|
||||
safeLink'
|
||||
:: forall endpoint api a. (IsElem endpoint api, HasLink endpoint)
|
||||
=> (Link -> a)
|
||||
-> Proxy api -- ^ The whole API that this endpoint is a part of
|
||||
-> Proxy endpoint -- ^ The API endpoint you would like to point to
|
||||
-> MkLink endpoint a
|
||||
safeLink' toA _ endpoint = toLink toA endpoint (Link mempty mempty)
|
||||
|
||||
-- | Create all links in an API.
|
||||
--
|
||||
-- Note that the @api@ type must be restricted to the endpoints that have
|
||||
-- valid links to them.
|
||||
--
|
||||
-- >>> type API = "foo" :> Capture "name" Text :> Get '[JSON] Text :<|> "bar" :> Capture "name" Int :> Get '[JSON] Double
|
||||
-- >>> let fooLink :<|> barLink = allLinks (Proxy :: Proxy API)
|
||||
-- >>> :t fooLink
|
||||
-- fooLink :: Text -> Link
|
||||
-- >>> :t barLink
|
||||
-- barLink :: Int -> Link
|
||||
--
|
||||
-- Note: nested APIs don't work well with this approach
|
||||
--
|
||||
-- >>> :kind! MkLink (Capture "nest" Char :> (Capture "x" Int :> Get '[JSON] Int :<|> Capture "y" Double :> Get '[JSON] Double)) Link
|
||||
-- MkLink (Capture "nest" Char :> (Capture "x" Int :> Get '[JSON] Int :<|> Capture "y" Double :> Get '[JSON] Double)) Link :: *
|
||||
-- = Char -> (Int -> Link) :<|> (Double -> Link)
|
||||
allLinks
|
||||
:: forall api. HasLink api
|
||||
=> Proxy api
|
||||
-> MkLink api Link
|
||||
allLinks = allLinks' id
|
||||
|
||||
-- | More general 'allLinks'. See `safeLink'`.
|
||||
allLinks'
|
||||
:: forall api a. HasLink api
|
||||
=> (Link -> a)
|
||||
-> Proxy api
|
||||
-> MkLink api a
|
||||
allLinks' toA api = toLink toA api (Link mempty mempty)
|
||||
|
||||
-- | Construct a toLink for an endpoint.
|
||||
class HasLink endpoint where
|
||||
type MkLink endpoint (a :: *)
|
||||
toLink
|
||||
:: (Link -> a)
|
||||
-> Proxy endpoint -- ^ The API endpoint you would like to point to
|
||||
-> Link
|
||||
-> MkLink endpoint a
|
||||
|
||||
-- Naked symbol instance
|
||||
instance (KnownSymbol sym, HasLink sub) => HasLink (sym :> sub) where
|
||||
type MkLink (sym :> sub) a = MkLink sub a
|
||||
toLink toA _ =
|
||||
toLink toA (Proxy :: Proxy sub) . addSegment (escaped seg)
|
||||
where
|
||||
seg = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
-- QueryParam instances
|
||||
instance (KnownSymbol sym, ToHttpApiData v, HasLink sub, SBoolI (FoldRequired mods))
|
||||
=> HasLink (QueryParam' mods sym v :> sub)
|
||||
where
|
||||
type MkLink (QueryParam' mods sym v :> sub) a = If (FoldRequired mods) v (Maybe v) -> MkLink sub a
|
||||
toLink toA _ l mv =
|
||||
toLink toA (Proxy :: Proxy sub) $
|
||||
case sbool :: SBool (FoldRequired mods) of
|
||||
STrue -> (addQueryParam . SingleParam k . toQueryParam) mv l
|
||||
SFalse -> maybe id (addQueryParam . SingleParam k . toQueryParam) mv l
|
||||
where
|
||||
k :: String
|
||||
k = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
instance (KnownSymbol sym, ToHttpApiData v, HasLink sub)
|
||||
=> HasLink (QueryParams sym v :> sub)
|
||||
where
|
||||
type MkLink (QueryParams sym v :> sub) a = [v] -> MkLink sub a
|
||||
toLink toA _ l =
|
||||
toLink toA (Proxy :: Proxy sub) .
|
||||
foldl' (\l' v -> addQueryParam (ArrayElemParam k (toQueryParam v)) l') l
|
||||
where
|
||||
k = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
instance (KnownSymbol sym, HasLink sub)
|
||||
=> HasLink (QueryFlag sym :> sub)
|
||||
where
|
||||
type MkLink (QueryFlag sym :> sub) a = Bool -> MkLink sub a
|
||||
toLink toA _ l False =
|
||||
toLink toA (Proxy :: Proxy sub) l
|
||||
toLink toA _ l True =
|
||||
toLink toA (Proxy :: Proxy sub) $ addQueryParam (FlagParam k) l
|
||||
where
|
||||
k = symbolVal (Proxy :: Proxy sym)
|
||||
|
||||
-- :<|> instance - Generate all links at once
|
||||
instance (HasLink a, HasLink b) => HasLink (a :<|> b) where
|
||||
type MkLink (a :<|> b) r = MkLink a r :<|> MkLink b r
|
||||
toLink toA _ l = toLink toA (Proxy :: Proxy a) l :<|> toLink toA (Proxy :: Proxy b) l
|
||||
|
||||
-- Misc instances
|
||||
instance HasLink sub => HasLink (ReqBody' mods ct a :> sub) where
|
||||
type MkLink (ReqBody' mods ct a :> sub) r = MkLink sub r
|
||||
toLink toA _ = toLink toA (Proxy :: Proxy sub)
|
||||
|
||||
instance (ToHttpApiData v, HasLink sub)
|
||||
=> HasLink (Capture' mods sym v :> sub)
|
||||
where
|
||||
type MkLink (Capture' mods sym v :> sub) a = v -> MkLink sub a
|
||||
toLink toA _ l v =
|
||||
toLink toA (Proxy :: Proxy sub) $
|
||||
addSegment (escaped . Text.unpack $ toUrlPiece v) l
|
||||
|
||||
instance (ToHttpApiData v, HasLink sub)
|
||||
=> HasLink (CaptureAll sym v :> sub)
|
||||
where
|
||||
type MkLink (CaptureAll sym v :> sub) a = [v] -> MkLink sub a
|
||||
toLink toA _ l vs = toLink toA (Proxy :: Proxy sub) $
|
||||
foldl' (flip $ addSegment . escaped . Text.unpack . toUrlPiece) l vs
|
||||
|
||||
instance HasLink sub => HasLink (Header' mods sym (a :: *) :> sub) where
|
||||
type MkLink (Header' mods sym a :> sub) r = MkLink sub r
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (Vault :> sub) where
|
||||
type MkLink (Vault :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (Description s :> sub) where
|
||||
type MkLink (Description s :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (Summary s :> sub) where
|
||||
type MkLink (Summary s :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (HttpVersion :> sub) where
|
||||
type MkLink (HttpVersion:> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (IsSecure :> sub) where
|
||||
type MkLink (IsSecure :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (WithNamedContext name context sub) where
|
||||
type MkLink (WithNamedContext name context sub) a = MkLink sub a
|
||||
toLink toA _ = toLink toA (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (RemoteHost :> sub) where
|
||||
type MkLink (RemoteHost :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink sub => HasLink (BasicAuth realm a :> sub) where
|
||||
type MkLink (BasicAuth realm a :> sub) r = MkLink sub r
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
instance HasLink EmptyAPI where
|
||||
type MkLink EmptyAPI a = EmptyAPI
|
||||
toLink _ _ _ = EmptyAPI
|
||||
|
||||
-- Verb (terminal) instances
|
||||
instance HasLink (Verb m s ct a) where
|
||||
type MkLink (Verb m s ct a) r = r
|
||||
toLink toA _ = toA
|
||||
|
||||
instance HasLink Raw where
|
||||
type MkLink Raw a = a
|
||||
toLink toA _ = toA
|
||||
|
||||
instance HasLink (Stream m fr ct a) where
|
||||
type MkLink (Stream m fr ct a) r = r
|
||||
toLink toA _ = toA
|
||||
|
||||
-- AuthProtext instances
|
||||
instance HasLink sub => HasLink (AuthProtect tag :> sub) where
|
||||
type MkLink (AuthProtect tag :> sub) a = MkLink sub a
|
||||
toLink = simpleToLink (Proxy :: Proxy sub)
|
||||
|
||||
-- | Helper for implemneting 'toLink' for combinators not affecting link
|
||||
-- structure.
|
||||
simpleToLink
|
||||
:: forall sub a combinator.
|
||||
(HasLink sub, MkLink sub a ~ MkLink (combinator :> sub) a)
|
||||
=> Proxy sub
|
||||
-> (Link -> a)
|
||||
-> Proxy (combinator :> sub)
|
||||
-> Link
|
||||
-> MkLink (combinator :> sub) a
|
||||
simpleToLink _ toA _ = toLink toA (Proxy :: Proxy sub)
|
||||
|
||||
|
||||
-- $setup
|
||||
-- >>> import Servant.API
|
||||
-- >>> import Data.Text (Text)
|
||||
import Servant.Links
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
#if __GLASGOW_HASKELL__ < 709
|
||||
{-# OPTIONS_GHC -fcontext-stack=41 #-}
|
||||
#endif
|
||||
module Servant.Utils.LinksSpec where
|
||||
module Servant.LinksSpec where
|
||||
|
||||
import Data.Proxy (Proxy (..))
|
||||
import Test.Hspec (Expectation, Spec, describe, it,
|
||||
|
|
@ -15,7 +15,7 @@ import Test.Hspec (Expectation, Spec, describe, it,
|
|||
import Data.String (fromString)
|
||||
|
||||
import Servant.API
|
||||
import Servant.Utils.Links
|
||||
import Servant.Links
|
||||
import Servant.API.Internal.Test.ComprehensiveAPI (comprehensiveAPIWithoutRaw)
|
||||
|
||||
type TestApi =
|
||||
|
|
@ -51,7 +51,7 @@ shouldBeLink link expected =
|
|||
toUrlPiece link `shouldBe` fromString expected
|
||||
|
||||
spec :: Spec
|
||||
spec = describe "Servant.Utils.Links" $ do
|
||||
spec = describe "Servant.Links" $ do
|
||||
it "generates correct links for capture query params" $ do
|
||||
let l1 = Proxy :: Proxy ("hello" :> Capture "name" String :> Delete '[JSON] NoContent)
|
||||
apiLink l1 "hi" `shouldBeLink` "hello/hi"
|
||||
Loading…
Reference in New Issue
Block a user