FreeMoney.FreeMoneyModule.BitcoinInitializePaymentPage C# (CSharp) Method

        public Hashtable BitcoinInitializePaymentPage(Hashtable request)
        {
            Dictionary<string, object> postvals = ServerUtils.ParseQueryString ((string)request["body"]);

            UUID txnID = new UUID ((string)postvals["txn"]);

            if (!m_transactionsInProgress.ContainsKey (txnID)) {
                Hashtable ereply = new Hashtable ();

                ereply["int_response_code"] = 404;
                // 200 OK
                ereply["str_response_string"] = "Invalid Transaction";
                ereply["content_type"] = "text/html";

                return ereply;
            }

            FreeMoneyTransaction txn = m_transactionsInProgress[txnID];

            string baseUrl = m_scenes[0].RegionInfo.ExternalHostName + ":" + m_scenes[0].RegionInfo.HttpPort;

            bool has_errors = false;

            BitcoinTransaction btc_trans = InitializeBitcoinTransaction(txn, baseUrl);
            has_errors = btc_trans.HasErrors();

            if (has_errors) {
                string error_message = "<p><strong>Sorry, I couldn't set up this payment.</strong></p>";
                return ShowUserPage(request, baseUrl, txn, error_message);
            }

            string user_identifier = txn.From.ToString();
            BitcoinAddress count_btc_addr = new BitcoinAddress(m_connectionString, m_btcconfig);
            int count_all_addresses = count_btc_addr.CountAddressesForAvatar(user_identifier, true);
            int count_usable_addresses = count_btc_addr.CountAddressesForAvatar(user_identifier, false);

            Dictionary<string, string> replacements = new Dictionary<string, string> ();
            //replacements.Add ("{BTC_SESSION_ID}",  HttpUtility.HtmlEncode(btc_session_id));
            //TODO put HttpUtility back
            replacements.Add ("{BTC_SESSION_ID}", GetSessionKey( txn.From ).ToString());
            bool is_submit = true; // TODO
            if (is_submit) {
                replacements.Add ("{BTC_ERRORS}",  "");
                replacements.Add ("{BTC_DISABLE_COMPLETE_START}",  "<!--");
                replacements.Add ("{BTC_DISABLE_COMPLETE_END}",  "-->");
                replacements.Add ("{BTC_DISABLE_INCOMPLETE_START}",  "");
                replacements.Add ("{BTC_DISABLE_INCOMPLETE_END}",  "");
            } else {
                replacements.Add ("{BTC_ERRORS}",  "");
                replacements.Add ("{BTC_DISABLE_INCOMPLETE_START}",  "<!--");
                replacements.Add ("{BTC_DISABLE_INCOMPLETE_END}",  "-->");
                replacements.Add ("{BTC_DISABLE_COMPLETE_START}",  "");
                replacements.Add ("{BTC_DISABLE_COMPLETE_END}",  "");
            }
            replacements.Add ("{BTC_AMOUNT}", btc_trans.GetBTCAmount().ToString());
            replacements.Add ("{BTC_ADDRESS}", btc_trans.GetBTCAddress().ToString());
            replacements.Add ("{BTC_COUNT_ALL_ADDRESSES}",  count_all_addresses.ToString());
            replacements.Add ("{BTC_COUNT_USABLE_ADDRESSES}", count_usable_addresses.ToString());

            string template;
            string template_name = "bitcoin-pay-template.htm";

            try {
                template = File.ReadAllText (template_name);
            } catch (IOException) {
                template = "Error: bitcoin-pay-template.htm does not exist.";
                //m_log.Error ("[FreeMoney] Unable to load template file.");
                m_log.Error("[FreeMoney] Could not load template file bitcoin-pay-template.htm");
                has_errors = true;
            }

            int response_code = has_errors ? 400 : 200;

            foreach (KeyValuePair<string, string> pair in replacements) {
                template = template.Replace (pair.Key, pair.Value);
            }

            Hashtable reply = new Hashtable ();

            reply["int_response_code"] = 200;
            // 200 OK
            reply["str_response_string"] = template;
            reply["content_type"] = "text/html";

            return reply;
        }