eidolon/Handler/Login.hs

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module Handler.Login where
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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
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data Credentials = Credentials
{ credentialsName :: Text
, credentialsPasswd :: Text
}
deriving Show
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getLoginR :: Handler Html
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getLoginR = do
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-- (loginWidget, enctype) <- generateFormPost loginForm
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defaultLayout $ do
$(widgetFile "login")
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postLoginR :: Handler RepJson
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postLoginR = do
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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
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hexSalted <- return $ toHex salted
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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)
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loginForm :: Form Credentials
loginForm = renderDivs $ Credentials
<$> areq textField "Username" Nothing
<*> areq passwordField "Password" Nothing
getLogoutR :: Handler Html
getLogoutR = do
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deleteSession "userId"
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setMessage "Succesfully logged out"
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redirect $ HomeR
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returnJson = return . repJson . object
returnJsonError = returnJson . (:[]) . ("error" .=)
hmacSHA1 keyData msgData =
let key = MacKey keyData
sha1 :: SHA1
sha1 = hmac' key msgData
in encode sha1