token modify part1

 from django.contrib.auth import get_user_model
 from oauth2_provider.contrib.rest_framework import OAuth2Authentication
 from oauth2_provider.oauth2_backends import get_oauthlib_core
+from rest_framework_jwt.authentication import JSONWebTokenAuthentication
+from rest_framework import exceptions
+from rest_framework_jwt.settings import api_settings
+import jwt
+from django.utils.translation import ugettext as _
+
+jwt_decode_handler = api_settings.JWT_DECODE_HANDLER
 
 
 class OAuth2AuthenticationWithUser(OAuth2Authentication):
@@ -21,3 +28,38 @@ class OAuth2AuthenticationWithUser(OAuth2Authentication):
             return self.user, r.access_token
         request.oauth2_error = getattr(r, "oauth2_error", {})
         return None
+
+
+class MyJSONWebTokenAuthentication(JSONWebTokenAuthentication):
+
+    def authenticate(self, request):
+        """
+        Returns a two-tuple of `User` and token if a valid signature has been
+        supplied using JWT-based authentication.  Otherwise returns `None`.
+        """
+        jwt_value = self.get_jwt_value(request)
+        if jwt_value is None:
+            return None
+
+        print('jwt_value: {0}'.format(jwt_value))
+
+        # try:
+        #     payload = jwt_decode_handler(jwt_value)
+        # except jwt.ExpiredSignature:
+        #     msg = _('Signature has expired.')
+        #     raise exceptions.AuthenticationFailed(msg)
+
+        try:
+            payload = jwt_decode_handler(jwt_value)
+        except jwt.ExpiredSignature:
+            msg = _('Signature has expired.')
+            raise exceptions.AuthenticationFailed(msg)
+        except jwt.DecodeError:
+            msg = _('Error decoding signature.')
+            raise exceptions.AuthenticationFailed(msg)
+        except jwt.InvalidTokenError:
+            raise exceptions.AuthenticationFailed()
+
+        user = self.authenticate_credentials(payload)
+
+        return (user, jwt_value)

@@ -156,7 +156,8 @@ REST_FRAMEWORK = {
     ),
     'DEFAULT_AUTHENTICATION_CLASSES': (
         'rest_framework.authentication.BasicAuthentication',
-        'rest_framework_jwt.authentication.JSONWebTokenAuthentication',
+        'apps.account.authentication.MyJSONWebTokenAuthentication',
+        # 'rest_framework_jwt.authentication.JSONWebTokenAuthentication',
         # 'oauth2_provider.contrib.rest_framework.OAuth2Authentication',
     ),
     'EXCEPTION_HANDLER': 'common.exceptions.exception_handler'