X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/15c68a7a08349d807c767cce58fdbeec0dcc192d..a9bcac16553e058df0d6da55692c8935388e5b5c:/contrib/sobol/utils.py

diff --git a/contrib/sobol/utils.py b/contrib/sobol/utils.py
new file mode 100644
index 0000000..723a463
--- /dev/null
+++ b/contrib/sobol/utils.py
@@ -0,0 +1,32 @@
+from django.conf import settings
+from django.http import QueryDict
+from django.utils.encoding import smart_str
+from django.utils.hashcompat import sha_constructor
+from django.utils.http import urlquote_plus, urlquote
+
+
+SEARCH_ARG_GET_KEY = 'q'
+URL_REDIRECT_GET_KEY = 'url'
+HASH_REDIRECT_GET_KEY = 's'
+
+
+def make_redirect_hash(search_arg, url):
+	return sha_constructor(smart_str(search_arg + url + settings.SECRET_KEY)).hexdigest()[::2]
+
+
+def check_redirect_hash(hash, search_arg, url):
+	return hash == make_redirect_hash(search_arg, url)
+
+
+def make_tracking_querydict(search_arg, url):
+	"""
+	Returns a QueryDict instance containing the information necessary
+	for tracking clicks of this url.
+	
+	NOTE: will this kind of initialization handle quoting correctly?
+	"""
+	return QueryDict("%s=%s&%s=%s&%s=%s" % (
+		SEARCH_ARG_GET_KEY, urlquote_plus(search_arg),
+ 		URL_REDIRECT_GET_KEY, urlquote(url),
+		HASH_REDIRECT_GET_KEY, make_redirect_hash(search_arg, url))
+	)
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