修复取消连接存在问题

Controller/alexa/AlexaController.py

@@ -180,10 +180,9 @@ class AppToAppView(View):
         request_method = 'delete'
         try:
             r = cls.refresh_access_token(user_id, request_method)
-            if r is None:
-                return response.json(173)
-            # 2xx响应状态码为成功
-            assert str(r.status_code)[:1] == '2'
+            if r is not None:
+                # 2xx响应状态码为成功
+                assert str(r.status_code)[:1] == '2'
             AlexaOauth.objects.filter(user_id=user_id).update(link_status=0)
             return response.json(0)
         except Exception as e:
@@ -202,10 +201,14 @@ class AppToAppView(View):
     @staticmethod
     def refresh_access_token(user_id, request_method):
         if request_method not in ['get', 'delete']:
-            return None
-        alexa_oauth_qs = AlexaOauth.objects.filter(user_id=user_id).values('alexa_api_endpoint', 'amazon_refresh_token')
+            return
+        alexa_oauth_qs = AlexaOauth.objects.filter(user_id=user_id).\
+            values('alexa_api_endpoint', 'amazon_refresh_token', 'link_status')
         if not alexa_oauth_qs:
-            return None
+            return
+        # 已连接,但token失效
+        if alexa_oauth_qs[0]['link_status'] == 2:
+            return
         now_time = int(time.time())
         # 使用刷新令牌获取新的访问令牌
         # https://developer.amazon.com/zh/docs/login-with-amazon/authorization-code-grant.html#using-refresh-tokens