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{-# LANGUAGE OverloadedStrings #-}
module Persona
( verifyEmail
) where
import Control.Monad (guard)
import Network.HTTP.Conduit
import Network.HTTP.Types.Status (ok200)
import Data.Text (Text)
import qualified Data.Text as T
import Data.ByteString.Lazy (fromStrict, toStrict)
import Data.Text.Encoding (encodeUtf8, decodeUtf8)
import Data.Aeson
import Data.Aeson.Types (parseMaybe)
import Config
verifyEmail :: Config -> Text -> IO (Maybe Text)
verifyEmail config assertion = do
initReq <- parseUrl "https://verifier.login.persona.org/verify"
let request =
(flip urlEncodedBody) (initReq { checkStatus = \_ _ _ -> Nothing }) $
[ ("assertion", encodeUtf8 $ assertion)
, ("audience", encodeUtf8 $ hostname config)
]
manager <- newManager tlsManagerSettings
response <- httpLbs request manager
if responseStatus response == ok200
then return . parseEmail . decodeUtf8 . toStrict . responseBody $ response
else return Nothing
parseEmail :: Text -> Maybe Text
parseEmail payload = do
result <- decode . fromStrict . encodeUtf8 $ payload
flip parseMaybe result $ \obj -> do
status <- T.pack <$> obj .: "status"
guard (status == "okay")
obj .: "email"
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