public async Task GetAadAuthorityUriAsync()

in CredentialProvider.Microsoft/CredentialProviders/Vsts/IAuthUtil.cs [47:86]
33 lines of code
9 McCabe index (conditional complexity)

        public async Task<Uri> GetAadAuthorityUriAsync(Uri uri, CancellationToken cancellationToken)
        {
            var environmentAuthority = EnvUtil.GetAuthorityFromEnvironment(logger);
            if (environmentAuthority != null)
            {
                return environmentAuthority;
            }

            var headers = await GetResponseHeadersAsync(uri, cancellationToken);
            var bearerHeaders = headers.WwwAuthenticate.Where(x => x.Scheme.Equals("Bearer", StringComparison.Ordinal));
            
            foreach (var param in bearerHeaders)
            {
                if (param.Parameter == null)
                {
                    // MSA-backed accounts don't expose a parameter
                    continue;
                }

                var equalSplit = param.Parameter.Split(new[] { "=" }, StringSplitOptions.RemoveEmptyEntries);
                if (equalSplit.Length == 2)
                {
                    if (equalSplit[0].Equals("authorization_uri", StringComparison.OrdinalIgnoreCase))
                    {
                        if (Uri.TryCreate(equalSplit[1], UriKind.Absolute, out Uri parsedUri))
                        {
                            logger.Verbose(string.Format(Resources.FoundAADAuthorityFromHeaders, parsedUri));
                            return parsedUri;
                        }
                    }
                }
            }

            // Return the common tenant
            var aadBase = UsePpeAadUrl(uri) ? "https://login.windows-ppe.net" : "https://login.microsoftonline.com";
            logger.Verbose(string.Format(Resources.AADAuthorityNotFound, aadBase));

            var tenant = EnvUtil.MsalEnabled() ? OrganizationsTenant: CommonTenant;
            return new Uri($"{aadBase}/{tenant}");
        }