AzureAD.hs

{-# LANGUAGE OverloadedStrings #-}

-- |
--
-- OAuth2 plugin for Azure AD.
--
-- * Authenticates against Azure AD
-- * Uses email as credentials identifier
module Yesod.Auth.OAuth2.AzureAD
  ( oauth2AzureAD
  , oauth2AzureADScoped
  ) where

import Yesod.Auth.OAuth2.Prelude
import Prelude

newtype User = User Text

instance FromJSON User where
  parseJSON = withObject "User" $ \o -> User <$> o .: "mail"

pluginName :: Text
pluginName = "azuread"

defaultScopes :: [Text]
defaultScopes = ["openid", "profile"]

oauth2AzureAD :: YesodAuth m => Text -> Text -> AuthPlugin m
oauth2AzureAD = oauth2AzureADScoped defaultScopes

oauth2AzureADScoped :: YesodAuth m => [Text] -> Text -> Text -> AuthPlugin m
oauth2AzureADScoped scopes clientId clientSecret =
  authOAuth2 pluginName oauth2 $ \manager token -> do
    (User userId, userResponse) <-
      authGetProfile
        pluginName
        manager
        token
        "https://graph.microsoft.com/v1.0/me"

    pure
      Creds
        { credsPlugin = pluginName
        , credsIdent = userId
        , credsExtra = setExtra token userResponse
        }
 where
  oauth2 =
    OAuth2
      { oauth2ClientId = clientId
      , oauth2ClientSecret = Just clientSecret
      , oauth2AuthorizeEndpoint =
          "https://login.windows.net/common/oauth2/authorize"
            `withQuery` [ scopeParam "," scopes
                        , ("resource", "https://graph.microsoft.com")
                        ]
      , oauth2TokenEndpoint = "https://login.windows.net/common/oauth2/token"
      , oauth2RedirectUri = Nothing
      }