Allow JWT as an authentication method, fixes haskell-github#489

src/GitHub/Auth.hs

@@ -1,5 +1,7 @@
 module GitHub.Auth (
     Auth (..),
+    Token,
+    JWTToken,
     AuthMethod,
     endpoint,
     setAuthRequest
@@ -9,14 +11,17 @@ import GitHub.Internal.Prelude
 import Prelude ()
 
 import qualified Data.ByteString     as BS
+import qualified Data.Text.Encoding  as TE
 import qualified Network.HTTP.Client as HTTP
 
 type Token = BS.ByteString
+type JWTToken = Text
 
 -- | The Github auth data type
 data Auth
     = BasicAuth BS.ByteString BS.ByteString  -- ^ Username and password
     | OAuth Token                            -- ^ OAuth token
+    | JWT JWTToken                           -- ^ JWT Token
     | EnterpriseOAuth Text Token             -- ^ Custom endpoint and OAuth token
     deriving (Show, Data, Typeable, Eq, Ord, Generic)
 
@@ -40,10 +45,12 @@ instance AuthMethod () where
 instance AuthMethod Auth where
     endpoint (BasicAuth _ _)       = Nothing
     endpoint (OAuth _)             = Nothing
+    endpoint (JWT _)             = Nothing
     endpoint (EnterpriseOAuth e _) = Just e
 
     setAuthRequest (BasicAuth u p)       = HTTP.applyBasicAuth u p
     setAuthRequest (OAuth t)             = setAuthHeader $ "token " <> t
+    setAuthRequest (JWT t)               = setAuthHeader $ "Bearer " <> TE.encodeUtf8 t
     setAuthRequest (EnterpriseOAuth _ t) = setAuthHeader $ "token " <> t
 
 setAuthHeader :: BS.ByteString -> HTTP.Request -> HTTP.Request