upgrade gunicorn 19.0

openedx/core/lib/x_forwarded_for/middleware.py

@@ -0,0 +1,30 @@
+"""
+Middleware to use the X-Forwarded-For header as the request IP.
+Updated the libray to use HTTP_HOST and X-Forwarded-Port as
+SERVER_NAME and SERVER_PORT.
+"""
+
+
+class XForwardedForMiddleware(object):
+    """
+    Gunicorn 19.0 has breaking changes for REMOTE_ADDR, SERVER_* headers
+    that can not override with forwarded and host headers.
+    This middleware can be used to update these headers set by proxy configuration.
+
+    """
+
+    def process_request(self, request):
+        """
+        Process the given request, update the value of REMOTE_ADDR, SERVER_NAME and SERVER_PORT based
+        on X-Forwarded-For, HTTP_HOST and X-Forwarded-Port headers
+        """
+
+        for field, header in [("HTTP_X_FORWARDED_FOR", "REMOTE_ADDR"), ("HTTP_HOST", "SERVER_NAME"),
+                              ("HTTP_X_FORWARDED_PORT", "SERVER_PORT")]:
+            if field in request.META:
+                if ',' in request.META[field]:
+                    request.META[header] = request.META[field].split(",")[0].strip()
+                else:
+                    request.META[header] = request.META[field]
+
+        return None