Decoding SAMLRequest.

[bhaskar jain <bhaskar.jain2002@gmail.com>]

Hello list,

   From the spec, for HTTP-Resirect binding, the SAMLRequest is DEFLATE-compressed, then Base 64 encoded, then URL encoded.

   I do this in Python for decoding the SAMLRequest to get the AuthnRequest. Was wondering if this will always work? Is there any better alternative in C / Python.

  

def decode_authn_request(authn_request):
""" AuthnRequest is always deflated, base64 encoded and url-escaped.

    :Parameters:
    -`authn_request`: AuthnRequest

    :Return:
     The decoded AuthnRequest if successful else empty string.
"""
decoded = ''
a = urllib.unquote(authn_request)
a = a.strip('SAMLRequest=')
try:
     decoded = zlib.decompress(base64.b64decode(a), -8)
except (zlib.error, TypeError):
try:
     decoded = zlib.decompress(base64.b64decode(a))
except (zlib.error, TypeError):
     pass
return decoded

Thanks,

Bhaskar.