{-# LANGUAGE OverloadedStrings #-}
-- |
--
-- OAuth2 plugin for http://upcase.com
--
-- * Authenticates against upcase
-- * Uses upcase user id as credentials identifier
--
module Yesod.Auth.OAuth2.Upcase
  ( oauth2Upcase
  ) where

import Yesod.Auth.OAuth2.Prelude

import qualified Data.Text as T

newtype User = User Int

instance FromJSON User where
  parseJSON :: Value -> Parser User
parseJSON = forall a. String -> (Object -> Parser a) -> Value -> Parser a
withObject String
"User" forall a b. (a -> b) -> a -> b
$ \Object
root -> do
    Object
o <- Object
root forall a. FromJSON a => Object -> Key -> Parser a
.: Key
"user"
    Int -> User
User forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Object
o forall a. FromJSON a => Object -> Key -> Parser a
.: Key
"id"

pluginName :: Text
pluginName :: Text
pluginName = Text
"upcase"

oauth2Upcase :: YesodAuth m => Text -> Text -> AuthPlugin m
oauth2Upcase :: forall m. YesodAuth m => Text -> Text -> AuthPlugin m
oauth2Upcase Text
clientId Text
clientSecret =
  forall m.
YesodAuth m =>
Text -> OAuth2 -> FetchCreds m -> AuthPlugin m
authOAuth2 Text
pluginName OAuth2
oauth2 forall a b. (a -> b) -> a -> b
$ \Manager
manager OAuth2Token
token -> do
    (User Int
userId, ByteString
userResponse) <- forall a.
FromJSON a =>
Text -> Manager -> OAuth2Token -> URI -> IO (a, ByteString)
authGetProfile
      Text
pluginName
      Manager
manager
      OAuth2Token
token
      URI
"http://upcase.com/api/v1/me.json"

    forall (f :: * -> *) a. Applicative f => a -> f a
pure Creds { credsPlugin :: Text
credsPlugin = Text
pluginName
               , credsIdent :: Text
credsIdent  = String -> Text
T.pack forall a b. (a -> b) -> a -> b
$ forall a. Show a => a -> String
show Int
userId
               , credsExtra :: [(Text, Text)]
credsExtra  = OAuth2Token -> ByteString -> [(Text, Text)]
setExtra OAuth2Token
token ByteString
userResponse
               }
 where
  oauth2 :: OAuth2
oauth2 = OAuth2
    { oauth2ClientId :: Text
oauth2ClientId          = Text
clientId
    , oauth2ClientSecret :: Maybe Text
oauth2ClientSecret      = forall a. a -> Maybe a
Just Text
clientSecret
    , oauth2AuthorizeEndpoint :: URI
oauth2AuthorizeEndpoint = URI
"http://upcase.com/oauth/authorize"
    , oauth2TokenEndpoint :: URI
oauth2TokenEndpoint     = URI
"http://upcase.com/oauth/token"
    , oauth2RedirectUri :: Maybe URI
oauth2RedirectUri       = forall a. Maybe a
Nothing
    }