diff --git a/src/Yesod/Auth/OAuth2/BattleNet.hs b/src/Yesod/Auth/OAuth2/BattleNet.hs
index dd58571..43b9758 100644
--- a/src/Yesod/Auth/OAuth2/BattleNet.hs
+++ b/src/Yesod/Auth/OAuth2/BattleNet.hs
@@ -9,10 +9,9 @@
 -- * Uses user's id as credentials identifier.
 -- * Returns user's battletag in extras.
 --
-
 module Yesod.Auth.OAuth2.BattleNet
-  ( oAuth2BattleNet )
-  where
+  ( oAuth2BattleNet
+  ) where
 
 #if __GLASGOW_HASKELL__ < 710
 import Control.Applicative ((<$>), (<*>))
@@ -20,59 +19,62 @@ import Control.Applicative ((<$>), (<*>))
 
 import Control.Exception (throwIO)
 import Control.Monad (mzero)
-
-import Yesod.Auth
-import Yesod.Auth.OAuth2
-
-import Data.Monoid ((<>))
-import Network.HTTP.Conduit (Manager)
-
 import Data.Aeson
+import Data.Monoid ((<>))
 import Data.Text (Text)
 import qualified Data.Text as T (pack, toLower)
 import qualified Data.Text.Encoding as E (encodeUtf8)
+import Network.HTTP.Conduit (Manager)
 import Prelude
+import Yesod.Auth
+import Yesod.Auth.OAuth2
 import Yesod.Core.Widget
 
 data BattleNetUser = BattleNetUser
-              { userId    :: Int
-              , battleTag :: Text
-              }
+    { userId :: Int
+    , battleTag :: Text
+    }
 
 instance FromJSON BattleNetUser where
-  parseJSON (Object o) = BattleNetUser
-                           <$> o .: "id"
-                           <*> o .: "battletag"
-  parseJSON _ = mzero
+    parseJSON (Object o) = BattleNetUser
+        <$> o .: "id"
+        <*> o .: "battletag"
+    parseJSON _ = mzero
 
-oAuth2BattleNet :: YesodAuth m
-                => Text -- ^ Client ID
-                -> Text -- ^ Client Secret
-                -> Text -- ^ User region (e.g. "eu", "cn", "us")
-                -> WidgetT m IO () -- ^ Login widget
-                -> AuthPlugin m
-oAuth2BattleNet clientId clientSecret region widget = authOAuth2Widget widget "battle.net" oAuthData $ makeCredentials region
-  where oAuthData = OAuth2 { oauthClientId            = clientId
-                           , oauthClientSecret        = clientSecret
-                           , oauthOAuthorizeEndpoint  = fromRelative "https" host "/oauth/authorize"
-                           , oauthAccessTokenEndpoint = fromRelative "https" host "/oauth/token"
-                           , oauthCallback            = Nothing
-                           }
+oAuth2BattleNet
+    :: YesodAuth m
+    => Text -- ^ Client ID
+    -> Text -- ^ Client Secret
+    -> Text -- ^ User region (e.g. "eu", "cn", "us")
+    -> WidgetT m IO () -- ^ Login widget
+    -> AuthPlugin m
+oAuth2BattleNet clientId clientSecret region widget =
+    authOAuth2Widget widget "battle.net" oAuthData $ makeCredentials region
+  where
+    oAuthData = OAuth2
+        { oauthClientId = clientId
+        , oauthClientSecret = clientSecret
+        , oauthOAuthorizeEndpoint = fromRelative "https" host "/oauth/authorize"
+        , oauthAccessTokenEndpoint = fromRelative "https" host "/oauth/token"
+        , oauthCallback = Nothing
+        }
 
-        host = wwwHost $ T.toLower region
+    host = wwwHost $ T.toLower region
 
 makeCredentials :: Text -> Manager -> OAuth2Token -> IO (Creds m)
 makeCredentials region manager token = do
     userResult <- authGetJSON manager (accessToken token)
         $ fromRelative "https" (apiHost $ T.toLower region) "/account/user"
 
-    case userResult of
-         Left err -> throwIO $ invalidProfileResponse "battle.net" err
-         Right user -> return Creds
-           { credsPlugin = "battle.net"
-           , credsIdent  = T.pack $ show $ userId user
-           , credsExtra  = [("battletag", battleTag user)]
-           }
+    either
+        (throwIO . invalidProfileResponse "battle.net")
+        (\user ->
+            return Creds
+               { credsPlugin = "battle.net"
+               , credsIdent = T.pack $ show $ userId user
+               , credsExtra = [("battletag", battleTag user)]
+               }
+        ) userResult
 
 apiHost :: Text -> Host
 apiHost "cn" = "api.battlenet.com.cn"