module Yesod.Auth.OAuth2.Github
( oauth2Github
, oauth2GithubScoped
, module Yesod.Auth.OAuth2
) where
#if __GLASGOW_HASKELL__ < 710
import Control.Applicative ((<$>), (<*>))
#endif
import Control.Exception.Lifted
import Control.Monad (mzero)
import Data.Aeson
import Data.Monoid ((<>))
import Data.Text (Text)
import Data.Text.Encoding (encodeUtf8, decodeUtf8)
import Network.HTTP.Conduit (Manager)
import Yesod.Auth
import Yesod.Auth.OAuth2
import qualified Data.Text as T
data GithubUser = GithubUser
{ githubUserId :: Int
, githubUserName :: Maybe Text
, githubUserLogin :: Text
, githubUserAvatarUrl :: Text
}
instance FromJSON GithubUser where
parseJSON (Object o) = GithubUser
<$> o .: "id"
<*> o .:? "name"
<*> o .: "login"
<*> o .: "avatar_url"
parseJSON _ = mzero
data GithubUserEmail = GithubUserEmail
{ githubUserEmail :: Text
}
instance FromJSON GithubUserEmail where
parseJSON (Object o) = GithubUserEmail
<$> o .: "email"
parseJSON _ = mzero
oauth2Github :: YesodAuth m
=> Text
-> Text
-> AuthPlugin m
oauth2Github clientId clientSecret = oauth2GithubScoped clientId clientSecret ["user:email"]
oauth2GithubScoped :: YesodAuth m
=> Text
-> Text
-> [Text]
-> AuthPlugin m
oauth2GithubScoped clientId clientSecret scopes = authOAuth2 "github" oauth fetchGithubProfile
where
oauth = OAuth2
{ oauthClientId = encodeUtf8 clientId
, oauthClientSecret = encodeUtf8 clientSecret
, oauthOAuthorizeEndpoint = encodeUtf8 $ "https://github.com/login/oauth/authorize?scope=" <> T.intercalate "," scopes
, oauthAccessTokenEndpoint = "https://github.com/login/oauth/access_token"
, oauthCallback = Nothing
}
fetchGithubProfile :: Manager -> AccessToken -> IO (Creds m)
fetchGithubProfile manager token = do
userResult <- authGetJSON manager token "https://api.github.com/user"
mailResult <- authGetJSON manager token "https://api.github.com/user/emails"
case (userResult, mailResult) of
(Right _, Right []) -> throwIO $ InvalidProfileResponse "github" "no mail address for user"
(Right user, Right mails) -> return $ toCreds user mails token
(Left err, _) -> throwIO $ InvalidProfileResponse "github" err
(_, Left err) -> throwIO $ InvalidProfileResponse "github" err
toCreds :: GithubUser -> [GithubUserEmail] -> AccessToken -> Creds m
toCreds user userMail token = Creds
{ credsPlugin = "github"
, credsIdent = T.pack $ show $ githubUserId user
, credsExtra =
[ ("email", githubUserEmail $ head userMail)
, ("login", githubUserLogin user)
, ("avatar_url", githubUserAvatarUrl user)
, ("access_token", decodeUtf8 $ accessToken token)
] ++ maybeName (githubUserName user)
}
where
maybeName Nothing = []
maybeName (Just name) = [("name", name)]