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 your response comes in a single string that that never varies and has as many lines as there are expressions to match, you can split it into an array on the newlines called authentication_array and use regexps:

pattern_array = ['qop', 'realm', 'username', 'response', 'cnonce']
i = 0
parsed_dict = {}

for line in authentication_array:
    pattern = "(" + pattern_array[i] + ")" + "=(\".*\")" # build a matching pattern
    match = re.search(re.compile(pattern), line)         # make the match
    if match:
        parsed_dict[match.group(1)] = match.group(2)
    i += 1