I hope this isn't too off-topic, but the "weird" encoding is is just URL-safe base64 (see https://docs.python.org/2/library/base64.html#base64.urlsafe_b64decode

I hope this isn't too off-topic, but the "weird" encoding is is just URL-safe base64 (see https://docs.python.org/2/library/base64.html#base64.urlsafe_b64decode https://docs.python.org/2/library/base64.html#base64.urlsafe...).