add missing shortcut for HTTPProxyToWSGI middleware

we should've added a shortcut to oslo_middleware/__init__ to hide path.

additionally we shouldn't have added Middleware to class name as it's
redundant

Change-Id: Id581180c24006aa142eb8bf086eb7fc42835cff5
Closes-Bug: #1514507

oslo_middleware/__init__.py

@@ -15,6 +15,7 @@ __all__ = ['CatchErrors',
            'CORS',
            'Debug',
            'Healthcheck',
+           'HTTPProxyToWSGI',
            'RequestId',
            'RequestBodySizeLimiter',
            'SSLMiddleware']
@@ -24,6 +25,7 @@ from oslo_middleware.correlation_id import CorrelationId
 from oslo_middleware.cors import CORS
 from oslo_middleware.debug import Debug
 from oslo_middleware.healthcheck import Healthcheck
+from oslo_middleware.http_proxy_to_wsgi import HTTPProxyToWSGI
 from oslo_middleware.request_id import RequestId
 from oslo_middleware.sizelimit import RequestBodySizeLimiter
 from oslo_middleware.ssl import SSLMiddleware

oslo_middleware/http_proxy_to_wsgi.py

@@ -11,11 +11,11 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 # implied. See the License for the specific language governing permissions and
 # limitations under the License.
-
+from debtcollector import removals
 from oslo_middleware import base
 
 
-class HTTPProxyToWSGIMiddleware(base.ConfigurableMiddleware):
+class HTTPProxyToWSGI(base.ConfigurableMiddleware):
     """HTTP proxy to WSGI termination middleware.
 
     This middleware overloads WSGI environment variables with the one provided
@@ -68,3 +68,8 @@ class HTTPProxyToWSGIMiddleware(base.ConfigurableMiddleware):
         v = req.environ.get("HTTP_X_FORWARDED_PREFIX")
         if v:
             req.environ['SCRIPT_NAME'] = v + req.environ['SCRIPT_NAME']
+
+
+@removals.remove
+class HTTPProxyToWSGIMiddleware(HTTPProxyToWSGI):
+    """Placeholder for backward compatibility"""

oslo_middleware/tests/test_http_proxy_to_wsgi.py

@@ -24,13 +24,22 @@ class TestHTTPProxyToWSGI(test_base.BaseTestCase):
     def setUp(self):
         super(TestHTTPProxyToWSGI, self).setUp()
 
+        @webob.dec.wsgify()
+        def fake_app(req):
+            return util.application_uri(req.environ)
+
+        self.middleware = http_proxy_to_wsgi.HTTPProxyToWSGI(fake_app)
+        self.request = webob.Request.blank('/foo/bar', method='POST')
+
+    def test_backward_compat(self):
         @webob.dec.wsgify()
         def fake_app(req):
             return util.application_uri(req.environ)
 
         self.middleware = http_proxy_to_wsgi.HTTPProxyToWSGIMiddleware(
             fake_app)
-        self.request = webob.Request.blank('/foo/bar', method='POST')
+        response = self.request.get_response(self.middleware)
+        self.assertEqual(b"http://localhost:80/", response.body)
 
     def test_no_headers(self):
         response = self.request.get_response(self.middleware)