python-base64url

URL and filename-safe base64url codec as described by IETF

• Replaces base64 + with -
• Replaces base64 / with _
• Removes base64 = padding at end

Example:

>>> base64url.base64urlencode("/ciN+g==")
'_ciN-g'
>>> base64url.base64urldecode("_ciN-g")
'/ciN+g=='