HTML5の公開ページ抽出を公開コード方式に

public class XeroApiAdapter
    {
        private readonly IXeroApiParameter _parameter;
        private const string PARTNER_URL = "https://api-partner.network.xero.com";
        private const string BASE_URL = "https://api.xero.com";


        public XeroCoreApi CoreApi { get; private set; }


        private readonly X509Certificate2 _signingCertificate;
        private readonly X509Certificate2 _partnerCertificate;


        /// <summary>
        //// 
        /// </summary>
        //// <param name="parameter"></param>
        public XeroApiAdapter(IXeroApiParameter parameter)
        {
            _signingCertificate = XeroOAuthSettings.Fetch;
            if (_signingCertificate == null)
            {
                throw new Exception("Signing certificate must be defined");
            }


            _partnerCertificate = XeroOAuthSettings.Fetch.PartnerCertificate;
            if (_partnerCertificate == null)
            {
                throw new Exception("partner certificate must be defined");
            }


            _parameter = parameter;
            var user = new ApiUser { OrganisationId = parameter.NetworkId, Name = parameter.NetworkId }




            CoreApi = new XeroCoreApi(PARTNER_URL,
            new RuPartnerAuthethicator(PARTNER_URL, BASE_URL, XeroTokenServices.Do,
                _signingCertificate, _partnerCertificate),
            new Consumer(parameter.ConsumerKey, parameter.ConsumerSecret), user,
            new DefaultMapper(), new DefaultMapper());
        }


        public PartnerMvcAuthenticator MvcAuthenticator(string callBack)
        {
            return new PartnerMvcAuthenticator(PARTNER_URL, BASE_URL, callBack, XeroTokenServices.Do,
                _signingCertificate, _partnerCertificate,
                new Consumer(_parameter.ConsumerKey, _parameter.ConsumerSecret),
                XeroRequestTokenServices.Do);
        }




        
    }

public class RuPartnerAuthethicator : PartnerAuthenticator
    {
        public RuPartnerAuthethicator(string baseUri, string authorizeUri, ITokenStore store, string signingCertificatePath, string certificatePath, string password) : base(baseUri, authorizeUri, "", store, signingCertificatePath, certificatePath, password)
        {
        }


        public RuPartnerAuthethicator(string baseUri, string authorizeUri, ITokenStore store, X509Certificate2 signingCertificate, X509Certificate2 certificate) : base(baseUri, authorizeUri, "", store, signingCertificate, certificate)
        {
        }


        protected override string AuthorizeUser(IToken token)
        {
            throw new XeroRenewAccessTokenException("Please renew access token");
        }
    }