def request_continue_url(self, key="continue", default="/"):
""" Gets the request string representing a continue URL for the current
request.
This will safely filter out continue URL's that are not-served by
us so that users can't be tricked into going to a malicious site post
login or some other flow that goes through KA.
"""
val = self.request_string(key, default)
if val and not App.is_dev_server and not url_util.is_khanacademy_url(val):
logging.warn("Invalid continue URI [%s]. Ignoring." % val)
if val != default and url_util.is_khanacademy_url(default):
# Make a last ditch effort to try the default, in case the
# explicit continue URI was the bad one
return default
return "/"
return val
def test_detection_of_non_ka_urls(self):
self.assertFalse(url_util.is_khanacademy_url("http://evil.com"))
self.assertFalse(url_util.is_khanacademy_url("https://khanacademie.phising.com"))
def is_ka_url(url):
return url_util.is_khanacademy_url(url)