Add the ability to blacklist v2 for specific versions

endpoints/v2/__init__.py

@@ -3,6 +3,7 @@ import logging
 from flask import Blueprint, make_response, url_for, request, jsonify
 from functools import wraps
 from urlparse import urlparse
+from semantic_version import Spec
 
 import features
 
@@ -13,8 +14,10 @@ from auth.auth_context import get_grant_context
 from auth.permissions import (ReadRepositoryPermission, ModifyRepositoryPermission,
                               AdministerRepositoryPermission)
 from data import model
+from app import app
 from util.http import abort
 from util.saas.metricqueue import time_blueprint
+from util.registry.dockerver import docker_version
 from auth.registry_jwt_auth import process_registry_jwt_auth, get_auth_headers
 
 logger = logging.getLogger(__name__)
@@ -75,6 +78,14 @@ def route_show_if(value):
 @process_registry_jwt_auth
 @anon_allowed
 def v2_support_enabled():
+  docker_ver = docker_version(request.user_agent.string)
+
+  # Check if our version is one of the blacklisted versions, if we can't
+  # identify the version (None) we will fail open and assume that it is
+  # newer and therefore should not be blacklisted.
+  if Spec(app.config['BLACKLIST_V2_SPEC']).match(docker_ver) and docker_ver is not None:
+    abort(404)
+
   response = make_response('true', 200)
 
   if get_grant_context() is None: