module Handler.Login where import Import hiding (returnJson) import qualified Data.Text as T import Yesod hiding (returnJson) import Crypto.HMAC import Crypto.Hash.CryptoAPI (SHA1) import qualified Data.ByteString as B import Data.Text.Encoding (decodeUtf8, encodeUtf8) import Data.Serialize (encode) import Data.Maybe data Credentials = Credentials { credentialsName :: Text , credentialsPasswd :: Text } deriving Show getLoginR :: Handler Html getLoginR = do -- (loginWidget, enctype) <- generateFormPost loginForm defaultLayout $ do $(widgetFile "login") postLoginR :: Handler RepJson postLoginR = do mUserName <- lookupPostParam "username" mHexToken <- lookupPostParam "token" mHexResponse <- lookupPostParam "response" case (mUserName, mHexToken, mHexResponse) of (Just userName, Nothing, Nothing) -> do tempUser <- runDB $ selectFirst [UserName ==. userName] [] case tempUser of Just (Entity userId user) -> do salt <- return $ userSalt user token <- liftIO makeRandomToken tokenId <- runDB $ insert $ Token (encodeUtf8 token) "login" (Just userId) returnJson ["salt" .= (toHex salt), "token" .= (toHex $ encodeUtf8 token)] Nothing -> returnJsonError ("No such user" :: T.Text) (Nothing, Just hexToken, Just hexResponse) -> do response <- do tempToken <- return $ fromHex' $ T.unpack hexToken savedToken <- runDB $ selectFirst [TokenKind ==. "login", TokenToken ==. tempToken] [] case savedToken of Just (Entity tokenId token) -> do savedUserId <- return $ tokenUser token queriedUser <- runDB $ getJust (fromJust savedUserId) salted <- return $ userSalted queriedUser hexSalted <- return $ toHex $ fromJust salted expected <- return $ hmacSHA1 (tokenToken token) (encodeUtf8 hexSalted) case (fromHex' $ T.unpack hexResponse) == expected of True -> -- Success!! return $ Right savedUserId _ -> return $ Left ("Wrong password" :: T.Text) Nothing -> return $ Left "Invalid token" case response of Left msg -> returnJsonError msg Right userId -> do setSession "userId" $ extractKey (fromJust userId) welcomeLink <- ($ProfileR (fromJust userId)) <$> getUrlRender returnJson ["welcome" .= welcomeLink] _ -> returnJsonError ("Protocol error" :: T.Text) loginForm :: Form Credentials loginForm = renderDivs $ Credentials <$> areq textField "Username" Nothing <*> areq passwordField "Password" Nothing getLogoutR :: Handler Html getLogoutR = do deleteSession "userId" setMessage "Succesfully logged out" redirect $ HomeR returnJson = return . repJson . object returnJsonError = returnJson . (:[]) . ("error" .=) hmacSHA1 keyData msgData = let key = MacKey keyData sha1 :: SHA1 sha1 = hmac' key msgData in encode sha1