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{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE OverloadedStrings #-}
module Sproxy.Application.OAuth2.Google
( provider
) where
import Control.Applicative (empty)
import Control.Exception (Exception, throwIO)
import Data.Aeson (FromJSON, Value(Object), (.:), decode, parseJSON)
import Data.ByteString.Lazy (ByteString)
import Data.Monoid ((<>))
import Data.Text (Text, unpack)
import Data.Typeable (Typeable)
import qualified Network.HTTP.Conduit as H
import Network.HTTP.Types.URI (urlEncode)
import Sproxy.Application.Cookie (newUser, setFamilyName, setGivenName)
import Sproxy.Application.OAuth2.Common
( AccessTokenBody(accessToken)
, OAuth2Client(..)
, OAuth2Provider
)
provider :: OAuth2Provider
provider (client_id, client_secret) =
OAuth2Client
{ oauth2Description = "Google"
, oauth2AuthorizeURL =
\state redirect_uri ->
"https://accounts.google.com/o/oauth2/v2/auth" <> "?scope=" <>
urlEncode
True
"https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinfo.profile" <>
"&client_id=" <>
urlEncode True client_id <>
"&prompt=select_account" <>
"&redirect_uri=" <>
urlEncode True redirect_uri <>
"&response_type=code" <>
"&state=" <>
urlEncode True state
, oauth2Authenticate =
\code redirect_uri -> do
let treq =
H.urlEncodedBody
[ ("client_id", client_id)
, ("client_secret", client_secret)
, ("code", code)
, ("grant_type", "authorization_code")
, ("redirect_uri", redirect_uri)
] $
H.parseRequest_
"POST https://www.googleapis.com/oauth2/v4/token"
mgr <- H.newManager H.tlsManagerSettings
tresp <- H.httpLbs treq mgr
case decode $ H.responseBody tresp of
Nothing -> throwIO $ GoogleException tresp
Just atResp -> do
ureq <-
H.parseRequest $
unpack
("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" <>
accessToken atResp)
uresp <- H.httpLbs ureq mgr
case decode $ H.responseBody uresp of
Nothing -> throwIO $ GoogleException uresp
Just u ->
return $
setFamilyName (familyName u) $
setGivenName (givenName u) $ newUser (email u)
}
data GoogleException =
GoogleException (H.Response ByteString)
deriving (Show, Typeable)
instance Exception GoogleException
data GoogleUserInfo = GoogleUserInfo
{ email :: Text
, givenName :: Text
, familyName :: Text
} deriving (Eq, Show)
instance FromJSON GoogleUserInfo where
parseJSON (Object v) =
GoogleUserInfo <$> v .: "email" <*> v .: "given_name" <*> v .: "family_name"
parseJSON _ = empty
|
