b935f28185
I also slipped a change into the Matrix Paramters section markdown generation, there is one less (superfluous) newline there now.
902 lines
30 KiB
Haskell
902 lines
30 KiB
Haskell
{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE TupleSections #-}
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{-# LANGUAGE TypeOperators #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE ConstraintKinds #-}
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{-# LANGUAGE UndecidableInstances #-}
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{-# LANGUAGE PolyKinds #-}
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-------------------------------------------------------------------------------
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-- | This module lets you get API docs for free. It lets generate
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-- an 'API' from the type that represents your API using 'docs':
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--
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-- @docs :: 'HasDocs' api => 'Proxy' api -> 'API'@
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--
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-- Alternately, if you wish to add one or more introductions to your
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-- documentation, use 'docsWithIntros':
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--
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-- @docsWithIntros :: 'HasDocs' api => [DocIntro] -> 'Proxy' api -> 'API'@
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--
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-- You can then call 'markdown' on the 'API' value:
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--
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-- @markdown :: 'API' -> String@
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--
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-- or define a custom pretty printer:
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--
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-- @yourPrettyDocs :: 'API' -> String -- or blaze-html's HTML, or ...@
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--
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-- The only thing you'll need to do will be to implement some classes
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-- for your captures, get parameters and request or response bodies.
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--
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-- Here's a little (but complete) example that you can run to see the
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-- markdown pretty printer in action:
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--
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-- > {-# LANGUAGE DataKinds #-}
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-- > {-# LANGUAGE DeriveGeneric #-}
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-- > {-# LANGUAGE TypeOperators #-}
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-- > {-# LANGUAGE FlexibleInstances #-}
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-- > {-# LANGUAGE OverloadedStrings #-}
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-- > {-# OPTIONS_GHC -fno-warn-orphans #-}
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-- > import Data.Aeson
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-- > import Data.Proxy
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-- > import Data.Text(Text)
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-- > import GHC.Generics
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-- > import Servant.API
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-- > import Servant.Docs
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-- >
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-- > -- * Example
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-- >
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-- > -- | A greet message data type
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-- > newtype Greet = Greet Text
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-- > deriving (Generic, Show)
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-- >
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-- > instance FromJSON Greet
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-- > instance ToJSON Greet
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-- >
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-- > -- We add some useful annotations to our captures,
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-- > -- query parameters and request body to make the docs
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-- > -- really helpful.
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-- > instance ToCapture (Capture "name" Text) where
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-- > toCapture _ = DocCapture "name" "name of the person to greet"
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-- >
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-- > instance ToCapture (Capture "greetid" Text) where
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-- > toCapture _ = DocCapture "greetid" "identifier of the greet msg to remove"
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-- >
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-- > instance ToParam (QueryParam "capital" Bool) where
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-- > toParam _ =
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-- > DocQueryParam "capital"
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-- > ["true", "false"]
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-- > "Get the greeting message in uppercase (true) or not (false).\
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-- > \Default is false."
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-- > Normal
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-- >
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-- > instance ToParam (MatrixParam "lang" String) where
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-- > toParam _ =
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-- > DocQueryParam "lang"
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-- > ["en", "sv", "fr"]
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-- > "Get the greeting message selected language. Default is en."
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-- > Normal
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-- >
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-- > instance ToSample Greet where
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-- > toSample = Just $ Greet "Hello, haskeller!"
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-- >
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-- > toSamples =
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-- > [ ("If you use ?capital=true", Greet "HELLO, HASKELLER")
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-- > , ("If you use ?capital=false", Greet "Hello, haskeller")
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-- > ]
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-- >
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-- > -- We define some introductory sections, these will appear at the top of the
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-- > -- documentation.
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-- > --
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-- > -- We pass them in with 'docsWith', below. If you only want to add
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-- > -- introductions, you may use 'docsWithIntros'
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-- > intro1 :: DocIntro
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-- > intro1 = DocIntro "On proper introductions." -- The title
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-- > [ "Hello there."
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-- > , "As documentation is usually written for humans, it's often useful \
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-- > \to introduce concepts with a few words." ] -- Elements are paragraphs
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-- >
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-- > intro2 :: DocIntro
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-- > intro2 = DocIntro "This title is below the last"
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-- > [ "You'll also note that multiple intros are possible." ]
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-- >
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-- >
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-- > -- API specification
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-- > type TestApi =
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-- > -- GET /hello/:name?capital={true, false} returns a Greet as JSON
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-- > "hello" :> MatrixParam "lang" String :> Capture "name" Text :> QueryParam "capital" Bool :> Get Greet
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-- >
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-- > -- POST /greet with a Greet as JSON in the request body,
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-- > -- returns a Greet as JSON
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-- > :<|> "greet" :> ReqBody Greet :> Post Greet
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-- >
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-- > -- DELETE /greet/:greetid
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-- > :<|> "greet" :> Capture "greetid" Text :> Delete
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-- >
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-- > testApi :: Proxy TestApi
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-- > testApi = Proxy
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-- >
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-- > -- Build some extra information for the DELETE /greet/:greetid endpoint. We
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-- > -- want to add documentation about a secret unicorn header and some extra
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-- > -- notes.
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-- > extra :: ExtraInfo TestApi
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-- > extra =
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-- > safeInfo (Proxy :: Proxy ("greet" :> Capture "greetid" Text :> Delete)) $
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-- > defAction & headers <>~ ["unicorns"]
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-- > & notes <>~ [ DocNote "Title" ["This is some text"]
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-- > , DocNote "Second secton" ["And some more"]
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-- > ]
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-- >
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-- > -- Generate the data that lets us have API docs. This
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-- > -- is derived from the type as well as from
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-- > -- the 'ToCapture', 'ToParam' and 'ToSample' instances from above.
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-- > --
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-- > -- If you didn't want intros and extra information, you could just call:
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-- > --
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-- > -- > docs testAPI :: API
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-- > docsGreet :: API
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-- > docsGreet = docsWith [intro1, intro2] extra testApi
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-- >
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-- > main :: IO ()
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-- > main = putStrLn $ markdown docsGreet
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module Servant.Docs
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( -- * 'HasDocs' class and key functions
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HasDocs(..), docs, markdown
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-- * Generating docs with extra information
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, ExtraInfo(..), docsWith, docsWithIntros, safeInfo
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, -- * Classes you need to implement for your types
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ToSample(..)
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, sampleByteString
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, sampleByteStrings
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, ToParam(..)
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, ToCapture(..)
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, -- * ADTs to represent an 'API'
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Method(..)
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, Endpoint, path, method, defEndpoint
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, API, emptyAPI
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, DocCapture(..), capSymbol, capDesc
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, DocQueryParam(..), ParamKind(..), paramName, paramValues, paramDesc, paramKind
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, DocNote(..), noteTitle, noteBody
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, DocIntro(..)
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, Response, respStatus, respBody, defResponse
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, Action, captures, headers, notes, params, rqbody, response, defAction
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, single
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, -- * Useful modules when defining your doc printers
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module Control.Lens
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, module Data.Monoid
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) where
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import Control.Lens hiding (Action)
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import Data.Aeson
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import Data.Aeson.Encode.Pretty (encodePretty)
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import Data.Ord(comparing)
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import Data.ByteString.Lazy.Char8 (ByteString)
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import Data.Hashable
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import Data.HashMap.Strict (HashMap)
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import Data.List
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import Data.Maybe (listToMaybe)
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import Data.Monoid
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import Data.Proxy
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import Data.Text (Text, pack, unpack)
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import Data.String.Conversions
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import GHC.Generics
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import GHC.TypeLits
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import GHC.Exts(Constraint)
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import Servant.API
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import Servant.Utils.Links
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import qualified Data.HashMap.Strict as HM
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import qualified Data.Text as T
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-- | Supported HTTP request methods
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data Method = DocDELETE -- ^ the DELETE method
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| DocGET -- ^ the GET method
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| DocPOST -- ^ the POST method
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| DocPUT -- ^ the PUT method
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deriving (Eq, Generic)
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instance Show Method where
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show DocGET = "GET"
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show DocPOST = "POST"
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show DocDELETE = "DELETE"
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show DocPUT = "PUT"
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instance Hashable Method
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-- | An 'Endpoint' type that holds the 'path' and the 'method'.
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--
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-- Gets used as the key in the 'API' hashmap. Modify 'defEndpoint'
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-- or any 'Endpoint' value you want using the 'path' and 'method'
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-- lenses to tweak.
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--
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-- @
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-- λ> 'defEndpoint'
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-- GET /
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-- λ> 'defEndpoint' & 'path' '<>~' ["foo"]
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-- GET /foo
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-- λ> 'defEndpoint' & 'path' '<>~' ["foo"] & 'method' '.~' 'DocPOST'
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-- POST /foo
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-- @
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data Endpoint = Endpoint
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{ _path :: [String] -- type collected
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, _method :: Method -- type collected
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} deriving (Eq, Generic)
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instance Show Endpoint where
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show (Endpoint p m) =
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show m ++ " " ++ showPath p
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-- |
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-- Render a path as a '/'-delimited string
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--
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showPath :: [String] -> String
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showPath [] = "/"
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showPath ps = concatMap ('/' :) ps
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-- | An 'Endpoint' whose path is `"/"` and whose method is 'DocGET'
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--
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-- Here's how you can modify it:
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--
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-- @
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-- λ> 'defEndpoint'
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-- GET /
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-- λ> 'defEndpoint' & 'path' '<>~' ["foo"]
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-- GET /foo
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-- λ> 'defEndpoint' & 'path' '<>~' ["foo"] & 'method' '.~' 'DocPOST'
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-- POST /foo
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-- @
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defEndpoint :: Endpoint
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defEndpoint = Endpoint [] DocGET
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instance Hashable Endpoint
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-- | Our API documentation type, a product of top-level information and a good
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-- old hashmap from 'Endpoint' to 'Action'
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data API = API
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{ _apiIntros :: [DocIntro]
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, _apiEndpoints :: HashMap Endpoint Action
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} deriving (Eq, Show)
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instance Monoid API where
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API a1 b1 `mappend` API a2 b2 = API (a1 <> a2) (b1 <> b2)
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mempty = API mempty mempty
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-- | An empty 'API'
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emptyAPI :: API
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emptyAPI = mempty
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-- | A type to represent captures. Holds the name of the capture
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-- and a description.
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--
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-- Write a 'ToCapture' instance for your captured types.
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data DocCapture = DocCapture
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{ _capSymbol :: String -- type supplied
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, _capDesc :: String -- user supplied
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} deriving (Eq, Show)
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-- | A type to represent a /GET/ parameter from the Query String. Holds its name,
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-- the possible values (leave empty if there isn't a finite number of them),
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-- and a description of how it influences the output or behavior.
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--
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-- Write a 'ToParam' instance for your GET parameter types
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data DocQueryParam = DocQueryParam
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{ _paramName :: String -- type supplied
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, _paramValues :: [String] -- user supplied
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, _paramDesc :: String -- user supplied
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, _paramKind :: ParamKind
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} deriving (Eq, Show)
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-- | An introductory paragraph for your documentation. You can pass these to
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-- 'docsWithIntros'.
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data DocIntro = DocIntro
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{ _introTitle :: String -- ^ Appears above the intro blob
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, _introBody :: [String] -- ^ Each String is a paragraph.
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} deriving (Eq, Show)
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instance Ord DocIntro where
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compare = comparing _introTitle
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-- | A type to represent extra notes that may be attached to an 'Action'.
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--
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-- This is intended to be used when writing your own HasDocs instances to
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-- add extra sections to your endpoint's documentation.
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data DocNote = DocNote
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{ _noteTitle :: String
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, _noteBody :: [String]
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} deriving (Eq, Show)
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-- | Type of extra information that a user may wish to "union" with their
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-- documentation.
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--
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-- These are intended to be built using safeInfo.
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-- Multiple ExtraInfo may be combined with the monoid instance.
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newtype ExtraInfo layout = ExtraInfo (HashMap Endpoint Action)
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instance Monoid (ExtraInfo a) where
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mempty = ExtraInfo mempty
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ExtraInfo a `mappend` ExtraInfo b =
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ExtraInfo $ HM.unionWith combineAction a b
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-- | Type of GET parameter:
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--
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-- - Normal corresponds to @QueryParam@, i.e your usual GET parameter
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-- - List corresponds to @QueryParams@, i.e GET parameters with multiple values
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-- - Flag corresponds to @QueryFlag@, i.e a value-less GET parameter
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data ParamKind = Normal | List | Flag
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deriving (Eq, Show)
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-- | A type to represent an HTTP response. Has an 'Int' status and
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-- a 'Maybe ByteString' response body. Tweak 'defResponse' using
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-- the 'respStatus' and 'respBody' lenses if you want.
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--
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-- If you want to respond with a non-empty response body, you'll most likely
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-- want to write a 'ToSample' instance for the type that'll be represented
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-- as some JSON in the response.
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--
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-- Can be tweaked with two lenses.
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--
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-- > λ> defResponse
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-- > Response {_respStatus = 200, _respBody = []}
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-- > λ> defResponse & respStatus .~ 204 & respBody .~ [("If everything goes well", "{ \"status\": \"ok\" }")]
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-- > Response {_respStatus = 204, _respBody = [("If everything goes well", "{ \"status\": \"ok\" }")]}
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data Response = Response
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{ _respStatus :: Int
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, _respBody :: [(Text, ByteString)]
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} deriving (Eq, Show)
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-- | Default response: status code 200, no response body.
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--
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-- Can be tweaked with two lenses.
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--
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-- > λ> defResponse
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-- > Response {_respStatus = 200, _respBody = Nothing}
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-- > λ> defResponse & respStatus .~ 204 & respBody .~ Just "[]"
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-- > Response {_respStatus = 204, _respBody = Just "[]"}
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defResponse :: Response
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defResponse = Response 200 []
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-- | A datatype that represents everything that can happen
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-- at an endpoint, with its lenses:
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--
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-- - List of captures ('captures')
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-- - List of GET parameters ('params')
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-- - What the request body should look like, if any is requested ('rqbody')
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-- - What the response should be if everything goes well ('response')
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--
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-- You can tweak an 'Action' (like the default 'defAction') with these lenses
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-- to transform an action and add some information to it.
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data Action = Action
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{ _captures :: [DocCapture] -- type collected + user supplied info
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, _headers :: [Text] -- type collected
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, _params :: [DocQueryParam] -- type collected + user supplied info
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, _mxParams :: [(String, [DocQueryParam])] -- type collected + user supplied info
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, _notes :: [DocNote] -- user supplied
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, _rqbody :: Maybe ByteString -- user supplied
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, _response :: Response -- user supplied
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} deriving (Eq, Show)
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-- | Combine two Actions, we can't make a monoid as merging Response breaks the
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-- laws.
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--
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-- As such, we invent a non-commutative, left associative operation
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-- 'combineAction' to mush two together taking the response from the very left.
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combineAction :: Action -> Action -> Action
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Action c h p m n r resp `combineAction` Action c' h' p' m' n' r' _ =
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Action (c <> c') (h <> h') (p <> p') (m <> m') (n <> n') (r <> r') resp
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-- Default 'Action'. Has no 'captures', no GET 'params', expects
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-- no request body ('rqbody') and the typical response is 'defResponse'.
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--
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-- Tweakable with lenses.
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--
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-- > λ> defAction
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-- > Action {_captures = [], _headers = [], _params = [], _mxParams = [], _rqbody = Nothing, _response = Response {_respStatus = 200, _respBody = Nothing}}
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-- > λ> defAction & response.respStatus .~ 201
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-- > Action {_captures = [], _headers = [], _params = [], _mxParams = [], _rqbody = Nothing, _response = Response {_respStatus = 201, _respBody = Nothing}}
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defAction :: Action
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defAction =
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Action []
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[]
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[]
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[]
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[]
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Nothing
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defResponse
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-- | Create an API that's comprised of a single endpoint.
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-- 'API' is a 'Monoid', so combine multiple endpoints with
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-- 'mappend' or '<>'.
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single :: Endpoint -> Action -> API
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single e a = API mempty (HM.singleton e a)
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-- gimme some lenses
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makeLenses ''API
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makeLenses ''Endpoint
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makeLenses ''DocCapture
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makeLenses ''DocQueryParam
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makeLenses ''DocIntro
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makeLenses ''DocNote
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makeLenses ''Response
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makeLenses ''Action
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-- | Generate the docs for a given API that implements 'HasDocs'. This is the
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-- default way to create documentation.
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docs :: HasDocs layout => Proxy layout -> API
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docs p = docsFor p (defEndpoint, defAction)
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-- | Closed type family, check if endpoint is exactly within API.
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-- We aren't sure what affects how an Endpoint is built up, so we require an
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-- exact match.
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type family IsIn (endpoint :: *) (api :: *) :: Constraint where
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IsIn e (sa :<|> sb) = Or (IsIn e sa) (IsIn e sb)
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IsIn (e :> sa) (e :> sb) = IsIn sa sb
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IsIn e e = ()
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-- | Create an 'ExtraInfo' that is garunteed to be within the given API layout.
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--
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-- The safety here is to ensure that you only add custom documentation to an
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-- endpoint that actually exists within your API.
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--
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-- > extra :: ExtraInfo TestApi
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-- > extra =
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-- > safeInfo (Proxy :: Proxy ("greet" :> Capture "greetid" Text :> Delete)) $
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-- > defAction & headers <>~ ["unicorns"]
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-- > & notes <>~ [ DocNote "Title" ["This is some text"]
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-- > , DocNote "Second secton" ["And some more"]
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-- > ]
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safeInfo :: (IsIn endpoint layout, HasLink endpoint, HasDocs endpoint)
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=> Proxy endpoint -> Action -> ExtraInfo layout
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safeInfo p action =
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let api = docsFor p (defEndpoint, defAction)
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-- Assume one endpoint, HasLink constraint means that we should only ever
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-- point at one endpoint.
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in ExtraInfo $ api ^. apiEndpoints & traversed .~ action
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|
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-- | Generate documentation given some extra introductions (in the form of
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-- 'DocInfo') and some extra endpoint documentation (in the form of
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-- 'ExtraInfo'.
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--
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-- The extra introductions will be prepended to the top of the documentation,
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-- before the specific endpoint documentation. The extra endpoint documentation
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-- will be "unioned" with the automatically generated endpoint documentation.
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--
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-- You are expected to build up the ExtraInfo with the Monoid instance and
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-- 'safeInfo'.
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--
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-- If you only want to add an introduction, use 'docsWithIntros'.
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docsWith :: HasDocs layout
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=> [DocIntro]
|
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-> ExtraInfo layout
|
|
-> Proxy layout
|
|
-> API
|
|
docsWith intros (ExtraInfo endpoints) p =
|
|
docs p & apiIntros <>~ intros
|
|
& apiEndpoints %~ HM.unionWith combineAction endpoints
|
|
|
|
|
|
-- | Generate the docs for a given API that implements 'HasDocs' with with any
|
|
-- number of introduction(s)
|
|
docsWithIntros :: HasDocs layout => [DocIntro] -> Proxy layout -> API
|
|
docsWithIntros intros = docsWith intros mempty
|
|
|
|
-- | The class that abstracts away the impact of API combinators
|
|
-- on documentation generation.
|
|
class HasDocs layout where
|
|
docsFor :: Proxy layout -> (Endpoint, Action) -> API
|
|
|
|
-- | The class that lets us display a sample JSON input or output
|
|
-- when generating documentation for endpoints that either:
|
|
--
|
|
-- - expect a request body, or
|
|
-- - return a non empty response body
|
|
--
|
|
-- Example of an instance:
|
|
--
|
|
-- > {-# LANGUAGE DeriveGeneric #-}
|
|
-- > {-# LANGUAGE OverloadedStrings #-}
|
|
-- >
|
|
-- > import Data.Aeson
|
|
-- > import Data.Text
|
|
-- > import GHC.Generics
|
|
-- >
|
|
-- > data Greet = Greet { _msg :: Text }
|
|
-- > deriving (Generic, Show)
|
|
-- >
|
|
-- > instance FromJSON Greet
|
|
-- > instance ToJSON Greet
|
|
-- >
|
|
-- > instance ToSample Greet where
|
|
-- > toSample = Just g
|
|
-- >
|
|
-- > where g = Greet "Hello, haskeller!"
|
|
--
|
|
-- You can also instantiate this class using 'toSamples' instead of
|
|
-- 'toSample': it lets you specify different responses along with
|
|
-- some context (as 'Text') that explains when you're supposed to
|
|
-- get the corresponding response.
|
|
class ToJSON a => ToSample a where
|
|
{-# MINIMAL (toSample | toSamples) #-}
|
|
toSample :: Maybe a
|
|
toSample = fmap snd $ listToMaybe samples
|
|
where samples = toSamples :: [(Text, a)]
|
|
|
|
toSamples :: [(Text, a)]
|
|
toSamples = maybe [] (return . ("",)) s
|
|
where s = toSample :: Maybe a
|
|
|
|
sampleByteString :: forall a. ToSample a => Proxy a -> Maybe ByteString
|
|
sampleByteString Proxy = fmap encodePretty (toSample :: Maybe a)
|
|
|
|
sampleByteStrings :: forall a. ToSample a => Proxy a -> [(Text, ByteString)]
|
|
sampleByteStrings Proxy = samples & traverse._2 %~ encodePretty
|
|
|
|
where samples = toSamples :: [(Text, a)]
|
|
|
|
-- | The class that helps us automatically get documentation
|
|
-- for GET parameters.
|
|
--
|
|
-- Example of an instance:
|
|
--
|
|
-- > instance ToParam (QueryParam "capital" Bool) where
|
|
-- > toParam _ =
|
|
-- > DocQueryParam "capital"
|
|
-- > ["true", "false"]
|
|
-- > "Get the greeting message in uppercase (true) or not (false). Default is false."
|
|
class ToParam t where
|
|
toParam :: Proxy t -> DocQueryParam
|
|
|
|
-- | The class that helps us automatically get documentation
|
|
-- for URL captures.
|
|
--
|
|
-- Example of an instance:
|
|
--
|
|
-- > instance ToCapture (Capture "name" Text) where
|
|
-- > toCapture _ = DocCapture "name" "name of the person to greet"
|
|
class ToCapture c where
|
|
toCapture :: Proxy c -> DocCapture
|
|
|
|
-- | Generate documentation in Markdown format for
|
|
-- the given 'API'.
|
|
markdown :: API -> String
|
|
markdown api = unlines $
|
|
introsStr (api ^. apiIntros)
|
|
++ (concatMap (uncurry printEndpoint) . HM.toList $ api ^. apiEndpoints)
|
|
|
|
where printEndpoint :: Endpoint -> Action -> [String]
|
|
printEndpoint endpoint action =
|
|
str :
|
|
"" :
|
|
notesStr (action ^. notes) ++
|
|
capturesStr (action ^. captures) ++
|
|
mxParamsStr (action ^. mxParams) ++
|
|
headersStr (action ^. headers) ++
|
|
paramsStr (action ^. params) ++
|
|
rqbodyStr (action ^. rqbody) ++
|
|
responseStr (action ^. response) ++
|
|
[]
|
|
|
|
where str = "## " ++ show (endpoint^.method)
|
|
++ " " ++ showPath (endpoint^.path)
|
|
|
|
introsStr :: [DocIntro] -> [String]
|
|
introsStr = concatMap introStr
|
|
|
|
introStr :: DocIntro -> [String]
|
|
introStr i =
|
|
("#### " ++ i ^. introTitle) :
|
|
"" :
|
|
intersperse "" (i ^. introBody) ++
|
|
"" :
|
|
[]
|
|
|
|
notesStr :: [DocNote] -> [String]
|
|
notesStr = concatMap noteStr
|
|
|
|
noteStr :: DocNote -> [String]
|
|
noteStr nt =
|
|
("#### " ++ nt ^. noteTitle) :
|
|
"" :
|
|
intersperse "" (nt ^. noteBody) ++
|
|
"" :
|
|
[]
|
|
|
|
capturesStr :: [DocCapture] -> [String]
|
|
capturesStr [] = []
|
|
capturesStr l =
|
|
"#### Captures:" :
|
|
"" :
|
|
map captureStr l ++
|
|
"" :
|
|
[]
|
|
captureStr cap =
|
|
"- *" ++ (cap ^. capSymbol) ++ "*: " ++ (cap ^. capDesc)
|
|
|
|
mxParamsStr :: [(String, [DocQueryParam])] -> [String]
|
|
mxParamsStr [] = []
|
|
mxParamsStr l =
|
|
"#### Matrix Parameters:" :
|
|
"" :
|
|
map segmentStr l
|
|
segmentStr :: (String, [DocQueryParam]) -> String
|
|
segmentStr (segment, l) = unlines $
|
|
("**" ++ segment ++ "**:") :
|
|
"" :
|
|
map paramStr l ++
|
|
"" :
|
|
[]
|
|
|
|
headersStr :: [Text] -> [String]
|
|
headersStr [] = []
|
|
headersStr l = [""] ++ map headerStr l ++ [""]
|
|
|
|
where headerStr hname = "- This endpoint is sensitive to the value of the **"
|
|
++ unpack hname ++ "** HTTP header."
|
|
|
|
paramsStr :: [DocQueryParam] -> [String]
|
|
paramsStr [] = []
|
|
paramsStr l =
|
|
"#### GET Parameters:" :
|
|
"" :
|
|
map paramStr l ++
|
|
"" :
|
|
[]
|
|
paramStr param = unlines $
|
|
(" - " ++ param ^. paramName) :
|
|
(if (not (null values) || param ^. paramKind /= Flag)
|
|
then [" - **Values**: *" ++ intercalate ", " values ++ "*"]
|
|
else []) ++
|
|
(" - **Description**: " ++ param ^. paramDesc) :
|
|
(if (param ^. paramKind == List)
|
|
then [" - This parameter is a **list**. All GET parameters with the name "
|
|
++ param ^. paramName ++ "[] will forward their values in a list to the handler."]
|
|
else []) ++
|
|
(if (param ^. paramKind == Flag)
|
|
then [" - This parameter is a **flag**. This means no value is expected to be associated to this parameter."]
|
|
else []) ++
|
|
[]
|
|
|
|
where values = param ^. paramValues
|
|
|
|
rqbodyStr :: Maybe ByteString -> [String]
|
|
rqbodyStr Nothing = []
|
|
rqbodyStr (Just b) =
|
|
"#### Request Body:" :
|
|
jsonStr b
|
|
|
|
jsonStr b =
|
|
"" :
|
|
"``` javascript" :
|
|
cs b :
|
|
"```" :
|
|
"" :
|
|
[]
|
|
|
|
responseStr :: Response -> [String]
|
|
responseStr resp =
|
|
"#### Response:" :
|
|
"" :
|
|
(" - Status code " ++ show (resp ^. respStatus)) :
|
|
bodies
|
|
|
|
where bodies = case resp ^. respBody of
|
|
[] -> [" - No response body\n"]
|
|
[("", r)] -> " - Response body as below." : jsonStr r
|
|
xs ->
|
|
concatMap (\(ctx, r) -> (" - " <> T.unpack ctx) : jsonStr r) xs
|
|
|
|
-- * Instances
|
|
|
|
-- | The generated docs for @a ':<|>' b@ just appends the docs
|
|
-- for @a@ with the docs for @b@.
|
|
instance (HasDocs layout1, HasDocs layout2)
|
|
=> HasDocs (layout1 :<|> layout2) where
|
|
|
|
docsFor Proxy (ep, action) = docsFor p1 (ep, action) <> docsFor p2 (ep, action)
|
|
|
|
where p1 :: Proxy layout1
|
|
p1 = Proxy
|
|
|
|
p2 :: Proxy layout2
|
|
p2 = Proxy
|
|
|
|
-- | @"books" :> 'Capture' "isbn" Text@ will appear as
|
|
-- @/books/:isbn@ in the docs.
|
|
instance (KnownSymbol sym, ToCapture (Capture sym a), HasDocs sublayout)
|
|
=> HasDocs (Capture sym a :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint', action')
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
captureP = Proxy :: Proxy (Capture sym a)
|
|
|
|
action' = over captures (|> toCapture captureP) action
|
|
endpoint' = over path (\p -> p ++ [":" ++ symbolVal symP]) endpoint
|
|
symP = Proxy :: Proxy sym
|
|
|
|
|
|
instance HasDocs Delete where
|
|
docsFor Proxy (endpoint, action) =
|
|
single endpoint' action'
|
|
|
|
where endpoint' = endpoint & method .~ DocDELETE
|
|
|
|
action' = action & response.respBody .~ []
|
|
& response.respStatus .~ 204
|
|
|
|
instance ToSample a => HasDocs (Get a) where
|
|
docsFor Proxy (endpoint, action) =
|
|
single endpoint' action'
|
|
|
|
where endpoint' = endpoint & method .~ DocGET
|
|
action' = action & response.respBody .~ sampleByteStrings p
|
|
p = Proxy :: Proxy a
|
|
|
|
instance (KnownSymbol sym, HasDocs sublayout)
|
|
=> HasDocs (Header sym a :> sublayout) where
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint, action')
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
action' = over headers (|> headername) action
|
|
headername = pack $ symbolVal (Proxy :: Proxy sym)
|
|
|
|
instance ToSample a => HasDocs (Post a) where
|
|
docsFor Proxy (endpoint, action) =
|
|
single endpoint' action'
|
|
|
|
where endpoint' = endpoint & method .~ DocPOST
|
|
|
|
action' = action & response.respBody .~ sampleByteStrings p
|
|
& response.respStatus .~ 201
|
|
|
|
p = Proxy :: Proxy a
|
|
|
|
instance ToSample a => HasDocs (Put a) where
|
|
docsFor Proxy (endpoint, action) =
|
|
single endpoint' action'
|
|
|
|
where endpoint' = endpoint & method .~ DocPUT
|
|
|
|
action' = action & response.respBody .~ sampleByteStrings p
|
|
& response.respStatus .~ 200
|
|
|
|
p = Proxy :: Proxy a
|
|
|
|
|
|
instance (KnownSymbol sym, ToParam (QueryParam sym a), HasDocs sublayout)
|
|
=> HasDocs (QueryParam sym a :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint, action')
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
paramP = Proxy :: Proxy (QueryParam sym a)
|
|
action' = over params (|> toParam paramP) action
|
|
|
|
instance (KnownSymbol sym, ToParam (QueryParams sym a), HasDocs sublayout)
|
|
=> HasDocs (QueryParams sym a :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint, action')
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
paramP = Proxy :: Proxy (QueryParams sym a)
|
|
action' = over params (|> toParam paramP) action
|
|
|
|
|
|
instance (KnownSymbol sym, ToParam (QueryFlag sym), HasDocs sublayout)
|
|
=> HasDocs (QueryFlag sym :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint, action')
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
paramP = Proxy :: Proxy (QueryFlag sym)
|
|
action' = over params (|> toParam paramP) action
|
|
|
|
|
|
instance (KnownSymbol sym, ToParam (MatrixParam sym a), HasDocs sublayout)
|
|
=> HasDocs (MatrixParam sym a :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint', action')
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
paramP = Proxy :: Proxy (MatrixParam sym a)
|
|
segment = endpoint ^. (path._last)
|
|
segment' = action ^. (mxParams._last._1)
|
|
endpoint' = over (path._last) (\p -> p ++ ";" ++ symbolVal symP ++ "=<value>") endpoint
|
|
|
|
action' = if segment' /= segment
|
|
-- This is the first matrix parameter for this segment, insert a new entry into the mxParams list
|
|
then over mxParams (|> (segment, [toParam paramP])) action
|
|
-- We've already inserted a matrix parameter for this segment, append to the existing list
|
|
else action & mxParams._last._2 <>~ [toParam paramP]
|
|
symP = Proxy :: Proxy sym
|
|
|
|
|
|
instance (KnownSymbol sym, {- ToParam (MatrixParams sym a), -} HasDocs sublayout)
|
|
=> HasDocs (MatrixParams sym a :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint', action)
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
endpoint' = over path (\p -> p ++ [";" ++ symbolVal symP ++ "=<value>"]) endpoint
|
|
symP = Proxy :: Proxy sym
|
|
|
|
|
|
instance (KnownSymbol sym, {- ToParam (MatrixFlag sym), -} HasDocs sublayout)
|
|
=> HasDocs (MatrixFlag sym :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint', action)
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
|
|
endpoint' = over path (\p -> p ++ [";" ++ symbolVal symP]) endpoint
|
|
symP = Proxy :: Proxy sym
|
|
|
|
|
|
instance HasDocs Raw where
|
|
docsFor _proxy (endpoint, action) =
|
|
single endpoint action
|
|
|
|
instance (ToSample a, HasDocs sublayout)
|
|
=> HasDocs (ReqBody a :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint, action')
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
|
|
action' = action & rqbody .~ sampleByteString p
|
|
p = Proxy :: Proxy a
|
|
|
|
instance (KnownSymbol path, HasDocs sublayout) => HasDocs (path :> sublayout) where
|
|
|
|
docsFor Proxy (endpoint, action) =
|
|
docsFor sublayoutP (endpoint', action)
|
|
|
|
where sublayoutP = Proxy :: Proxy sublayout
|
|
endpoint' = endpoint & path <>~ [symbolVal pa]
|
|
pa = Proxy :: Proxy path
|
|
|
|
{-
|
|
|
|
-- | Serve your API's docs as markdown embedded in an html \<pre> tag.
|
|
--
|
|
-- > type MyApi = "users" :> Get [User]
|
|
-- > :<|> "docs :> Raw
|
|
-- >
|
|
-- > apiProxy :: Proxy MyApi
|
|
-- > apiProxy = Proxy
|
|
-- >
|
|
-- > server :: Server MyApi
|
|
-- > server = listUsers
|
|
-- > :<|> serveDocumentation apiProxy
|
|
serveDocumentation :: HasDocs api => Proxy api -> Server Raw
|
|
serveDocumentation proxy _request respond =
|
|
respond $ responseLBS ok200 [] $ cs $ toHtml $ markdown $ docs proxy
|
|
|
|
toHtml :: String -> String
|
|
toHtml md =
|
|
"<html>" ++
|
|
"<body>" ++
|
|
"<pre>" ++
|
|
md ++
|
|
"</pre>" ++
|
|
"</body>" ++
|
|
"</html>"
|
|
-}
|