From 9859e8546dbd9ef822976fbbafb00a7efc5f1f0c Mon Sep 17 00:00:00 2001
From: Calen Pennington <calen.pennington@gmail.com>
Date: Thu, 17 May 2012 13:23:20 -0400
Subject: [PATCH] Move accept header computations out of middleware

---
 djangoapps/courseware/views.py |  5 +++--
 lib/util/middleware.py         | 26 --------------------------
 lib/util/views.py              | 26 ++++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 28 deletions(-)

diff --git a/djangoapps/courseware/views.py b/djangoapps/courseware/views.py
index 61323a1dba..56409b65a5 100644
--- a/djangoapps/courseware/views.py
+++ b/djangoapps/courseware/views.py
@@ -18,6 +18,7 @@ from module_render import render_module, make_track_function, I4xSystem
 from models import StudentModule
 from student.models import UserProfile
 from util.errors import record_exception
+from util.views import accepts
 from multicourse import multicourse_settings
 
 import courseware.content_parser as content_parser
@@ -258,7 +259,7 @@ def modx_dispatch(request, module=None, dispatch=None, id=None):
         xml = content_parser.module_xml(request.user, module, 'id', id, coursename)
     except:
         record_exception(log, "Unable to load module during ajax call")
-        if 'text/html' in request.accepted_types:
+        if accepts(request, 'text/html'):
             return render_to_response("module-error.html", {})
         else:
             response = HttpResponse(json.dumps({'success': "We're sorry, this module is temporarily unavailable. Our staff is working to fix it as soon as possible"}))
@@ -278,7 +279,7 @@ def modx_dispatch(request, module=None, dispatch=None, id=None):
                                                              state=oldstate)
     except:
         record_exception(log, "Unable to load module instance during ajax call")
-        if 'text/html' in request.accepted_types:
+        if accepts(request, 'text/html'):
             return render_to_response("module-error.html", {})
         else:
             response = HttpResponse(json.dumps({'success': "We're sorry, this module is temporarily unavailable. Our staff is working to fix it as soon as possible"}))
diff --git a/lib/util/middleware.py b/lib/util/middleware.py
index 84ea2b4656..eeffa2668c 100644
--- a/lib/util/middleware.py
+++ b/lib/util/middleware.py
@@ -14,29 +14,3 @@ class ExceptionLoggingMiddleware(object):
             log.exception(exception)
             return HttpResponseServerError("Server Error - Please try again later.")
 
-# From http://djangosnippets.org/snippets/1042/
-def parse_accept_header(accept):
-    """Parse the Accept header *accept*, returning a list with pairs of
-    (media_type, q_value), ordered by q values.
-    """
-    result = []
-    for media_range in accept.split(","):
-        parts = media_range.split(";")
-        media_type = parts.pop(0)
-        media_params = []
-        q = 1.0
-        for part in parts:
-            (key, value) = part.lstrip().split("=", 1)
-            if key == "q":
-                q = float(value)
-            else:
-                media_params.append((key, value))
-        result.append((media_type, tuple(media_params), q))
-    result.sort(lambda x, y: -cmp(x[2], y[2]))
-    return result
-
-class AcceptMiddleware(object):
-    def process_request(self, request):
-        accept = parse_accept_header(request.META.get("HTTP_ACCEPT", ""))
-        request.accept = accept
-        request.accepted_types = map(lambda (t, p, q): t, accept)
diff --git a/lib/util/views.py b/lib/util/views.py
index d95f1e9a22..a071208e92 100644
--- a/lib/util/views.py
+++ b/lib/util/views.py
@@ -66,3 +66,29 @@ def mitxhome(request):
     if settings.ENABLE_MULTICOURSE:
         return render_to_response("mitxhome.html", {})
     return info(request)
+
+# From http://djangosnippets.org/snippets/1042/
+def parse_accept_header(accept):
+    """Parse the Accept header *accept*, returning a list with pairs of
+    (media_type, q_value), ordered by q values.
+    """
+    result = []
+    for media_range in accept.split(","):
+        parts = media_range.split(";")
+        media_type = parts.pop(0)
+        media_params = []
+        q = 1.0
+        for part in parts:
+            (key, value) = part.lstrip().split("=", 1)
+            if key == "q":
+                q = float(value)
+            else:
+                media_params.append((key, value))
+        result.append((media_type, tuple(media_params), q))
+    result.sort(lambda x, y: -cmp(x[2], y[2]))
+    return result
+
+def accepts(request, media_type):
+    """Return whether this request has an Accept header that matches type"""
+    accept = parse_accept_header(request.META.get("HTTP_ACCEPT", ""))
+    return media_type in [t for (t, p, q) in accept]