Monkey patch django.utils.http.is_safe_url for Django 1.8.10.

common/djangoapps/monkey_patch/django_utils_http_is_safe_url.py

@@ -0,0 +1,30 @@
+"""
+Monkey patch the is_safe_url method in django.utils.http for Django 1.8.10.
+In that release, the method crashes when a bytestring, non-unicode string is passed-in
+as the url.
+Remove the monkey patch when the bug is fixed in a Django 1.8 release. Here's the bug:
+https://code.djangoproject.com/ticket/26308
+"""
+
+from django.utils import http
+from django.utils.encoding import force_text
+
+
+def patch():
+    """
+    Monkey patch the django.utils.http.is_safe_url function to convert the incoming
+    url and host parameters to unicode.
+    """
+    def create_is_safe_url_wrapper(wrapped_func):
+        # pylint: disable=missing-docstring
+        def _wrap_is_safe_url(*args, **kwargs):
+            def _conv_text(value):
+                return None if value is None else force_text(value)
+            return wrapped_func(
+                # Converted *args.
+                *tuple(map(_conv_text, args)),
+                # Converted **kwargs.
+                **{key: _conv_text(value) for key, value in kwargs.items()}
+            )
+        return _wrap_is_safe_url
+    http.is_safe_url = create_is_safe_url_wrapper(http.is_safe_url)