mirror of
https://github.com/freckle/yesod-auth-oauth2.git
synced 2026-09-10 19:34:56 +02:00
145 lines
4.7 KiB
Haskell
145 lines
4.7 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE DeriveDataTypeable #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE QuasiQuotes #-}
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-- |
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--
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-- Generic OAuth2 plugin for Yesod
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--
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-- * See Yesod.Auth.OAuth2.GitHub for example usage.
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--
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module Yesod.Auth.OAuth2
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( authOAuth2
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, authOAuth2Widget
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, oauth2Url
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, fromProfileURL
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, YesodOAuth2Exception(..)
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, module Network.OAuth.OAuth2
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) where
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#if __GLASGOW_HASKELL__ < 710
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import Control.Applicative ((<$>))
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#endif
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import Control.Exception.Lifted
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import Control.Monad.IO.Class
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import Control.Monad (unless)
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import Data.ByteString (ByteString)
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import Data.Monoid ((<>))
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import Data.Text (Text, pack)
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import Data.Text.Encoding (decodeUtf8With, encodeUtf8)
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import Data.Text.Encoding.Error (lenientDecode)
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import Data.Typeable
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import Network.HTTP.Conduit (Manager)
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import Network.OAuth.OAuth2
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import System.Random
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import Yesod.Auth
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import Yesod.Core
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import qualified Data.ByteString.Lazy as BL
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-- | Provider name and Aeson parse error
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data YesodOAuth2Exception = InvalidProfileResponse Text BL.ByteString
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deriving (Show, Typeable)
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instance Exception YesodOAuth2Exception
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oauth2Url :: Text -> AuthRoute
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oauth2Url name = PluginR name ["forward"]
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-- | Create an @'AuthPlugin'@ for the given OAuth2 provider
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--
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-- Presents a generic @"Login via name"@ link
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--
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authOAuth2 :: YesodAuth m
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=> Text -- ^ Service name
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-> OAuth2 -- ^ Service details
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-> (Manager -> AccessToken -> IO (Creds m))
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-- ^ This function defines how to take an @'AccessToken'@ and
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-- retrieve additional information about the user, to be
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-- set in the session as @'Creds'@. Usually this means a
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-- second authorized request to @api/me.json@.
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--
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-- See @'fromProfileURL'@ for an example.
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-> AuthPlugin m
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authOAuth2 name = authOAuth2Widget [whamlet|Login via #{name}|] name
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-- | Create an @'AuthPlugin'@ for the given OAuth2 provider
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--
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-- Allows passing a custom widget for the login link. See @'oauth2Eve'@ for an
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-- example.
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--
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authOAuth2Widget :: YesodAuth m
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=> WidgetT m IO ()
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-> Text
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-> OAuth2
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-> (Manager -> AccessToken -> IO (Creds m))
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-> AuthPlugin m
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authOAuth2Widget widget name oauth getCreds = AuthPlugin name dispatch login
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where
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url = PluginR name ["callback"]
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withCallback csrfToken = do
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tm <- getRouteToParent
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render <- lift getUrlRender
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return oauth
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{ oauthCallback = Just $ encodeUtf8 $ render $ tm url
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, oauthOAuthorizeEndpoint = oauthOAuthorizeEndpoint oauth
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<> "&state=" <> encodeUtf8 csrfToken
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}
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dispatch "GET" ["forward"] = do
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csrfToken <- liftIO generateToken
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setSession tokenSessionKey csrfToken
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authUrl <- bsToText . authorizationUrl <$> withCallback csrfToken
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lift $ redirect authUrl
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dispatch "GET" ["callback"] = do
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csrfToken <- requireGetParam "state"
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oldToken <- lookupSession tokenSessionKey
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deleteSession tokenSessionKey
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unless (oldToken == (Just csrfToken)) $ permissionDenied "Invalid OAuth2 state token"
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code <- requireGetParam "code"
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oauth' <- withCallback csrfToken
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master <- lift getYesod
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result <- liftIO $ fetchAccessToken (authHttpManager master) oauth' (encodeUtf8 code)
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case result of
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Left _ -> permissionDenied "Unable to retreive OAuth2 token"
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Right token -> do
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creds <- liftIO $ getCreds (authHttpManager master) token
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lift $ setCredsRedirect creds
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where
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requireGetParam key = do
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m <- lookupGetParam key
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maybe (permissionDenied $ "'" <> key <> "' parameter not provided") return m
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dispatch _ _ = notFound
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generateToken = pack . take 30 . randomRs ('a', 'z') <$> newStdGen
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tokenSessionKey :: Text
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tokenSessionKey = "_yesod_oauth2_" <> name
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login tm = [whamlet|<a href=@{tm $ oauth2Url name}>^{widget}|]
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-- | Handle the common case of fetching Profile information from a JSON endpoint
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--
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-- Throws @'InvalidProfileResponse'@ if JSON parsing fails
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--
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fromProfileURL :: FromJSON a
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=> Text -- ^ Plugin name
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-> URI -- ^ Profile URI
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-> (a -> Creds m) -- ^ Conversion to Creds
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-> Manager -> AccessToken -> IO (Creds m)
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fromProfileURL name url toCreds manager token = do
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result <- authGetJSON manager token url
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case result of
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Right profile -> return $ toCreds profile
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Left err -> throwIO $ InvalidProfileResponse name err
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bsToText :: ByteString -> Text
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bsToText = decodeUtf8With lenientDecode
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