add API versioning for /api/v2/

awx/api/versioning.py

@@ -0,0 +1,30 @@
+# Copyright (c) 2017 Ansible by Red Hat
+# All Rights Reserved.
+
+from rest_framework.reverse import reverse as drf_reverse
+from rest_framework.versioning import URLPathVersioning as BaseVersioning
+
+
+def reverse(viewname, args=None, kwargs=None, request=None, format=None, **extra):
+    if request is None or getattr(request, 'version', None) is None:
+        # We need the "current request" to determine the correct version to
+        # prepend to reverse URLs.  If there is no "current request", assume
+        # the latest API version.
+        if kwargs is None:
+            kwargs = {}
+        if 'version' not in kwargs:
+            kwargs['version'] = 'v2'
+    return drf_reverse(viewname, args, kwargs, request, format, **extra)
+
+
+class URLPathVersioning(BaseVersioning):
+
+    def reverse(self, viewname, args=None, kwargs=None, request=None, format=None, **extra):
+        if request.version is not None:
+            kwargs = {} if (kwargs is None) else kwargs
+            kwargs[self.version_param] = request.version
+        request = None
+
+        return super(BaseVersioning, self).reverse(
+            viewname, args, kwargs, request, format, **extra
+        )