mirror of
https://github.com/freckle/yesod-auth-oauth2.git
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72 lines
2.2 KiB
Haskell
72 lines
2.2 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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-- |
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--
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-- OAuth2 plugin for http://www.google.com
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--
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-- * Authenticates against Google
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-- * Uses Google user id as credentials identifier
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--
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-- If you were previously relying on the ability to parse email as the creds
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-- identifier, you can still do that by overriding it in the creds returned by
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-- the plugin. For example:
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--
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-- > --
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-- > -- NOTE: proper use of Maybe/Either omitted for clarity.
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-- > --
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-- >
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-- > parseEmail :: ByteString -> Text
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-- > parseEmail = undefined
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-- >
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-- > authenticate creds = do
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-- > let userResponseJSON = fromJust $ lookup "userResponseJSON" credsExtra creds
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-- > userEmail = parseEmail userResponseJSON
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-- > updatedCreds = creds { credsIdent = userEmail }
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-- >
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-- > -- continue normally with updatedCreds
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--
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--
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module Yesod.Auth.OAuth2.Google
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( oauth2Google
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, oauth2GoogleScoped
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) where
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import Yesod.Auth.OAuth2.Prelude
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newtype User = User Text
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instance FromJSON User where
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parseJSON = withObject "User" $ \o -> User
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-- Required for data backwards-compatibility
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<$> (("google-uid:" <>) <$> o .: "sub")
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pluginName :: Text
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pluginName = "google"
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defaultScopes :: [Text]
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defaultScopes = ["openid", "email"]
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oauth2Google :: YesodAuth m => Text -> Text -> AuthPlugin m
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oauth2Google = oauth2GoogleScoped defaultScopes
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oauth2GoogleScoped :: YesodAuth m => [Text] -> Text -> Text -> AuthPlugin m
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oauth2GoogleScoped scopes clientId clientSecret =
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authOAuth2 pluginName oauth2 $ \manager token -> do
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(User userId, userResponseJSON) <-
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authGetProfile pluginName manager token "https://www.googleapis.com/oauth2/v3/userinfo"
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pure Creds
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{ credsPlugin = pluginName
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, credsIdent = userId
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, credsExtra = setExtra token userResponseJSON
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}
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where
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oauth2 = OAuth2
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{ oauthClientId = clientId
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, oauthClientSecret = clientSecret
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, oauthOAuthorizeEndpoint = "https://accounts.google.com/o/oauth2/auth" `withQuery`
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[ scopeParam "+" scopes
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]
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, oauthAccessTokenEndpoint = "https://www.googleapis.com/oauth2/v3/token"
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, oauthCallback = Nothing
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}
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