ServiceStack.AuthenticationInfo.AuthenticationInfo C# (CSharp) Method

        public AuthenticationInfo(String authHeader)
        {
            cnonce = "0a4f113b";
            nc = 1;

            // Example Digest header: WWW-Authenticate: Digest realm="[email protected]", qop="auth,auth-int", nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093", opaque="5ccc069c403ebaf9f0171e9517f40e41"

            // get method from first word
            int pos = authHeader.IndexOf(" ");
            if (pos < 0)
                throw new ApplicationException("Authentication header not supported: {0}".Fmt(authHeader));

            method = authHeader.Substring(0, pos).ToLower();
            string remainder = authHeader.Substring(pos + 1);

            // split the rest by comma, then =
            string[] pars = remainder.Split(',');
            string[] newpars = new string[pars.Length];
            int maxnewpars = 0;
            // test possibility that a comma is mid value for a split (as in above example)
            for (int i = 0; i < pars.Length; i++)
            {
                if (pars[i].EndsWith("\""))
                {
                    newpars[maxnewpars] = pars[i];
                    maxnewpars++;
                }
                else
                {
                    // merge with next one
                    newpars[maxnewpars] = pars[i] + "," + pars[i + 1];
                    maxnewpars++;
                    i++; // skips next value
                }
            }

            // now go through each part, splitting on first = character, and removing leading and trailing spaces and " quotes
            for (int i = 0; i < maxnewpars; i++)
            {
                int pos2 = newpars[i].IndexOf("=");
                string name = newpars[i].Substring(0, pos2).Trim();
                string value = newpars[i].Substring(pos2 + 1).Trim();
                if (value.StartsWith("\""))
                {
                    value = value.Substring(1);
                }
                if (value.EndsWith("\""))
                {
                    value = value.Substring(0, value.Length - 1);
                }

                if ("qop".Equals(name))
                {
                    qop = value;
                }
                else if ("realm".Equals(name))
                {
                    realm = value;
                }
                else if ("nonce".Equals(name))
                {
                    nonce = value;
                }
                else if ("opaque".Equals(name))
                {
                    opaque = value;
                }
            }
        }