{-# LANGUAGE OverloadedStrings #-}
-- |
--
-- OAuth2 plugin for http://twitch.tv
--
-- * Authenticates against twitch
-- * Uses twitch user id as credentials identifier
--
module Yesod.Auth.OAuth2.Twitch
  ( oauth2Twitch
  , oauth2TwitchScoped
  ) where

import Yesod.Auth.OAuth2.Prelude

import qualified Data.Text.Encoding as T

newtype User = User Text

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

pluginName :: Text
pluginName :: Text
pluginName = Text
"twitch"

defaultScopes :: [Text]
defaultScopes :: [Text]
defaultScopes = [Text
"user:read:email"]

oauth2Twitch :: YesodAuth m => Text -> Text -> AuthPlugin m
oauth2Twitch :: Text -> Text -> AuthPlugin m
oauth2Twitch = [Text] -> Text -> Text -> AuthPlugin m
forall m. YesodAuth m => [Text] -> Text -> Text -> AuthPlugin m
oauth2TwitchScoped [Text]
defaultScopes

oauth2TwitchScoped :: YesodAuth m => [Text] -> Text -> Text -> AuthPlugin m
oauth2TwitchScoped :: [Text] -> Text -> Text -> AuthPlugin m
oauth2TwitchScoped [Text]
scopes Text
clientId Text
clientSecret =
  Text -> OAuth2 -> FetchCreds m -> AuthPlugin m
forall m.
YesodAuth m =>
Text -> OAuth2 -> FetchCreds m -> AuthPlugin m
authOAuth2 Text
pluginName OAuth2
oauth2 (FetchCreds m -> AuthPlugin m) -> FetchCreds m -> AuthPlugin m
forall a b. (a -> b) -> a -> b
$ \Manager
manager OAuth2Token
token -> do
    (User Text
userId, ByteString
userResponse) <- Text -> Manager -> OAuth2Token -> URI -> IO (User, ByteString)
forall a.
FromJSON a =>
Text -> Manager -> OAuth2Token -> URI -> IO (a, ByteString)
authGetProfile
      Text
pluginName
      Manager
manager
      OAuth2Token
token
      URI
"https://id.twitch.tv/oauth2/validate"

    Creds m -> IO (Creds m)
forall (f :: * -> *) a. Applicative f => a -> f a
pure Creds :: forall master. Text -> Text -> [(Text, Text)] -> Creds master
Creds { credsPlugin :: Text
credsPlugin = Text
pluginName
               , credsIdent :: Text
credsIdent  = Text
userId
               , credsExtra :: [(Text, Text)]
credsExtra  = OAuth2Token -> ByteString -> [(Text, Text)]
setExtra OAuth2Token
token ByteString
userResponse
               }
 where
  oauth2 :: OAuth2
oauth2 = OAuth2 :: Text -> Maybe Text -> URI -> URI -> Maybe URI -> OAuth2
OAuth2
    { oauth2ClientId :: Text
oauth2ClientId          = Text
clientId
    , oauth2ClientSecret :: Maybe Text
oauth2ClientSecret      = Text -> Maybe Text
forall a. a -> Maybe a
Just Text
clientSecret
    , oauth2AuthorizeEndpoint :: URI
oauth2AuthorizeEndpoint = URI
"https://id.twitch.tv/oauth2/authorize"
                                  URI -> [(ByteString, ByteString)] -> URI
forall a. URIRef a -> [(ByteString, ByteString)] -> URIRef a
`withQuery` [Text -> [Text] -> (ByteString, ByteString)
scopeParam Text
" " [Text]
scopes]
    , oauth2TokenEndpoint :: URI
oauth2TokenEndpoint     = URI
"https://id.twitch.tv/oauth2/token"
                                  URI -> [(ByteString, ByteString)] -> URI
forall a. URIRef a -> [(ByteString, ByteString)] -> URIRef a
`withQuery` [ (ByteString
"client_id", Text -> ByteString
T.encodeUtf8 Text
clientId)
                                              , (ByteString
"client_secret", Text -> ByteString
T.encodeUtf8 Text
clientSecret)
                                              ]
    , oauth2RedirectUri :: Maybe URI
oauth2RedirectUri       = Maybe URI
forall a. Maybe a
Nothing
    }