Parse an HTTP request Authorization header with Python

Question

I need to take a header like this:

 Authorization: Digest qop=\"chap\",
     realm=\"testrealm@host.com\",
     username=\"Foobear\",
     response=\"6629fae         


        

Answer 1

If those components will always be there, then a regex will do the trick:

test = '''Authorization: Digest qop="chap", realm="testrealm@host.com", username="Foobear", response="6629fae49393a05397450978507c4ef1", cnonce="5ccc069c403ebaf9f0171e9517f40e41"'''

import re

re_auth = re.compile(r"""
    Authorization:\s*(?P[^ ]+)\s+
    qop="(?P[^"]+)",\s+
    realm="(?P[^"]+)",\s+
    username="(?P[^"]+)",\s+
    response="(?P[^"]+)",\s+
    cnonce="(?P[^"]+)"
    """, re.VERBOSE)

m = re_auth.match(test)
print m.groupdict()

produces:

{ 'username': 'Foobear', 
  'protocol': 'Digest', 
  'qop': 'chap', 
  'cnonce': '5ccc069c403ebaf9f0171e9517f40e41', 
  'realm': 'testrealm@host.com', 
  'response': '6629fae49393a05397450978507c4ef1'
}