Add middleware to ban bytedance user agent

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

vulnerabilities/middleware/ban_user_agent.py

@@ -0,0 +1,18 @@
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# VulnerableCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/nexB/vulnerablecode for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+from django.http import HttpResponseForbidden
+from django.utils.deprecation import MiddlewareMixin
+
+
+class BanUserAgent(MiddlewareMixin):
+    def process_request(self, request):
+        user_agent = request.META.get("HTTP_USER_AGENT", None)
+        if user_agent and "bytedance" in user_agent:
+            return HttpResponseForbidden("You are banned!", content_type="text/html")

vulnerabilities/tests/test_api.py

@@ -650,3 +650,9 @@ def test_with_invalid_cpes(self):
             content_type="application/json",
         ).json()
         assert response == {"Error": "Invalid CPE: CVE-2022-2022"}
+
+
+class TesBanUserAgent(TestCase):
+    def test_ban_request_with_bytedance_user_agent(self):
+        response = self.client.get(f"/api/packages", format="json", HTTP_USER_AGENT="bytedance")
+        assert "banned" in str(response.content)

vulnerablecode/settings.py

@@ -89,6 +89,7 @@
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
+    "vulnerabilities.middleware.ban_user_agent.BanUserAgent",
 )
 
 ROOT_URLCONF = "vulnerablecode.urls"