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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, decode, parseJSON, Value(Object), (.:))
import Data.ByteString.Lazy (ByteString)
import Data.Monoid ((<>))
import Data.Typeable (Typeable)
import Network.HTTP.Types (hContentType)
import Network.HTTP.Types.URI (urlEncode)
import qualified Network.HTTP.Conduit as H
import Sproxy.Application.Cookie (AuthUser(..))
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.setQueryString [
("client_id" , Just client_id)
, ("client_secret" , Just client_secret)
, ("code" , Just code)
, ("grant_type" , Just "authorization_code")
, ("redirect_uri" , Just redirect_uri)
] $ (H.parseRequest_ "POST https://www.googleapis.com/oauth2/v4/token") {
H.requestHeaders = [
(hContentType, "application/x-www-form-urlencoded")
]
}
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 $ "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 AuthUser { auEmail = email u, auGivenName = givenName u, auFamilyName = familyName u }
}
data GoogleException = GoogleException (H.Response ByteString)
deriving (Show, Typeable)
instance Exception GoogleException
data GoogleUserInfo = GoogleUserInfo {
email :: String
, givenName :: String
, familyName :: String
} deriving (Eq, Show)
instance FromJSON GoogleUserInfo where
parseJSON (Object v) = GoogleUserInfo
<$> v .: "email"
<*> v .: "given_name"
<*> v .: "family_name"
parseJSON _ = empty
|
