content: {-# LANGUAGE OverloadedStrings #-}
  
  module Yesod.Auth.OAuth2.ClassLink
    ( oauth2ClassLink
    , oauth2ClassLinkScoped
    ) where
  
  import Yesod.Auth.OAuth2.Prelude
  
  import qualified Data.Text as T
  
  newtype User = User Int
  
  instance FromJSON User where
    parseJSON = withObject "User" $ \o -> User <$> o .: "UserId"
  
  pluginName :: Text
  pluginName = "classlink"
  
  defaultScopes :: [Text]
  defaultScopes = ["profile", "oneroster"]
  
  oauth2ClassLink :: YesodAuth m => Text -> Text -> AuthPlugin m
  oauth2ClassLink = oauth2ClassLinkScoped defaultScopes
  
  oauth2ClassLinkScoped :: YesodAuth m => [Text] -> Text -> Text -> AuthPlugin m
  oauth2ClassLinkScoped scopes clientId clientSecret =
    authOAuth2 pluginName oauth2 $ \manager token -> do
      (User userId, userResponse) <-
        authGetProfile
          pluginName
          manager
          token
          "https://nodeapi.classlink.com/v2/my/info"
  
      pure
        Creds
          { credsPlugin = pluginName
          , credsIdent = T.pack $ show userId
          , credsExtra = setExtra token userResponse
          }
   where
    oauth2 =
      OAuth2
        { oauth2ClientId = clientId
        , oauth2ClientSecret = Just clientSecret
        , oauth2AuthorizeEndpoint =
            "https://launchpad.classlink.com/oauth2/v2/auth"
              `withQuery` [scopeParam "," scopes]
        , oauth2TokenEndpoint = "https://launchpad.classlink.com/oauth2/v2/token"
        , oauth2RedirectUri = Nothing
        }
  