Allow email to be used as an identifier of this module

Yesod/Auth/OAuth2/Google.hs

@@ -9,10 +9,13 @@
 -- * Returns given_name, family_name, email, and avatar_url as extras
 --
 module Yesod.Auth.OAuth2.Google
-       ( oauth2Google
-       , oauth2GoogleScoped
-       , module Yesod.Auth.OAuth2
-       ) where
+    ( oauth2Google
+    , oauth2GoogleScoped
+    , oauth2GoogleScopedWithCustomId
+    , googleUid
+    , emailUid
+    , module Yesod.Auth.OAuth2
+    ) where
 
 #if __GLASGOW_HASKELL__ < 710
 import Control.Applicative ((<$>), (<*>))
@@ -35,65 +38,84 @@ oauth2Google :: YesodAuth m
                 => Text -- ^ Client ID
                 -> Text -- ^ Client Secret
                 -> AuthPlugin m
-oauth2Google clientId clientSecret = oauth2GoogleScoped clientId clientSecret ["openid", "email"]
+oauth2Google = oauth2GoogleScoped ["openid", "email"]
 
 oauth2GoogleScoped :: YesodAuth m
-                      => Text -- ^ Client ID
+                      => [Text] -- ^ List of scopes to request
+                      -> Text -- ^ Client ID
                       -> Text -- ^ Client Secret
-                      -> [Text] -- ^ List of scopes to request
                       -> AuthPlugin m
-oauth2GoogleScoped clientId clientSecret scopes = authOAuth2 "google" oauth fetchGoogleProfile
-  where
-    oauth = OAuth2
-        { oauthClientId = encodeUtf8 clientId
-        , oauthClientSecret = encodeUtf8 clientSecret
-        , oauthOAuthorizeEndpoint = encodeUtf8 $
-                                    "https://accounts.google.com/o/oauth2/auth?scope=" <> T.intercalate "+" scopes
-        , oauthAccessTokenEndpoint = "https://www.googleapis.com/oauth2/v3/token"
-        , oauthCallback = Nothing
-        }
+oauth2GoogleScoped = oauth2GoogleScopedWithCustomId emailUid
+
+oauth2GoogleScopedWithCustomId :: YesodAuth m
+                                  => (GoogleUser -> AccessToken -> Creds m) -- ^ A function to generate the credentials
+                                  -> [Text] -- ^ List of scopes to request
+                                  -> Text -- ^ Client ID
+                                  -> Text -- ^ Client secret
+                                  -> AuthPlugin m
+oauth2GoogleScopedWithCustomId toCreds scopes clientId clientSecret = authOAuth2 "google" oauth $ fetchGoogleProfile toCreds
+    where
+      oauth = OAuth2
+          { oauthClientId = encodeUtf8 clientId
+          , oauthClientSecret = encodeUtf8 clientSecret
+          , oauthOAuthorizeEndpoint = encodeUtf8 $
+                                      "https://accounts.google.com/o/oauth2/auth?scope=" <> T.intercalate "+" scopes
+          , oauthAccessTokenEndpoint = "https://www.googleapis.com/oauth2/v3/token"
+          , oauthCallback = Nothing
+          }
 
 
-fetchGoogleProfile :: Manager -> AccessToken -> IO (Creds m)
-fetchGoogleProfile manager token = do
-  user <- authGetJSON manager token "https://www.googleapis.com/oauth2/v3/userinfo"
-  case user of
-   Right user -> return $ toCreds user token
-   Left err -> throwIO $ InvalidProfileResponse "google" err
+
+fetchGoogleProfile :: (GoogleUser -> AccessToken -> Creds m) -> Manager -> AccessToken -> IO (Creds m)
+fetchGoogleProfile toCreds manager token = do
+    userInfo <- authGetJSON manager token "https://www.googleapis.com/oauth2/v3/userinfo"
+    case userInfo of
+      Right user -> return $ toCreds user token
+      Left err -> throwIO $ InvalidProfileResponse "google" err
 
 data GoogleUser = GoogleUser
-                  { googleUserId :: Text
-                  , googleUserName :: Text
-                  , googleUserEmail :: Text
-                  , googleUserPicture :: Text
-                  , googleUserGivenName :: Text
-                  , googleUserFamilyName :: Text
-                  , googleUserHostedDomain :: Maybe Text
-                  }
+    { googleUserId :: Text
+    , googleUserName :: Text
+    , googleUserEmail :: Text
+    , googleUserPicture :: Text
+    , googleUserGivenName :: Text
+    , googleUserFamilyName :: Text
+    , googleUserHostedDomain :: Maybe Text
+    }
 
 instance FromJSON GoogleUser where
-  parseJSON (Object o) = GoogleUser
-                         <$> o .: "sub"
-                         <*> o .: "name"
-                         <*> o .: "email"
-                         <*> o .: "picture"
-                         <*> o .: "given_name"
-                         <*> o .: "family_name"
-                         <*> o .:? "hd"
+    parseJSON (Object o) = GoogleUser
+        <$> o .: "sub"
+        <*> o .: "name"
+        <*> o .: "email"
+        <*> o .: "picture"
+        <*> o .: "given_name"
+        <*> o .: "family_name"
+        <*> o .:? "hd"
 
-  parseJSON _ = mzero
+    parseJSON _ = mzero
   
 
-toCreds :: GoogleUser -> AccessToken -> Creds m
-toCreds user token = Creds { credsPlugin = "google"
-                           , credsIdent = "google-uid:" <> googleUserId user
-                           , credsExtra =
-                             [ ("email", googleUserEmail user)
-                             , ("name", googleUserName user)
-                             , ("given_name", googleUserGivenName user)
-                             , ("family_name", googleUserFamilyName user)
-                             , ("avatar_url", googleUserPicture user)
-                             , ("access_token", decodeUtf8 $ accessToken token)
-                             ] ++ maybeHostedDomain
-                           }
-  where maybeHostedDomain = maybeToList $ ((,) "hosted_domain") `fmap` googleUserHostedDomain user
+googleUid :: GoogleUser -> AccessToken -> Creds m
+googleUid = uidBuilder $ ("google-uid:" <>) . googleUserId
+
+
+emailUid :: GoogleUser -> AccessToken -> Creds m
+emailUid = uidBuilder googleUserEmail
+
+uidBuilder :: (GoogleUser -> Text) -> GoogleUser -> AccessToken -> Creds m
+uidBuilder f user token = Creds
+    { credsPlugin = "google"
+    , credsIdent = f user
+    , credsExtra =
+        [ ("email", googleUserEmail user)
+        , ("name", googleUserName user)
+        , ("given_name", googleUserGivenName user)
+        , ("family_name", googleUserFamilyName user)
+        , ("avatar_url", googleUserPicture user)
+        , ("access_token", decodeUtf8 $ accessToken token)
+        ] ++ maybeHostedDomain
+    }
+
+  where
+    maybeHostedDomain = maybeToList $ (,) "hosted_domain" <$> googleUserHostedDomain user