kh.gov.nbc.bakong_khqr.presenter.MerchantPresentedMode Maven / Gradle / Ivy

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The standardization of KHQR code specifications will help promote wider use of mobile retail payments in Cambodia and provide consistent user experience for merchants and consumers. It can enable interoperability in the payment industry. A common QR code would facilitate payments among different schemes, e-wallets and banks and would encourage small merchants to adopt KHQR code as payment method. KHQR is created for retail or remittance in Cambodia and Cross-Border. It only requires a single QR for receiving transactions from any payment provider through Bakong including Bakong App.

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package kh.gov.nbc.bakong_khqr.presenter;

import kh.gov.nbc.bakong_khqr.core.CRC;
import kh.gov.nbc.bakong_khqr.model.*;
import kh.gov.nbc.bakong_khqr.core.TagLengthString;
import kh.gov.nbc.bakong_khqr.utils.StringUtils;
import kh.gov.nbc.bakong_khqr.utils.BakongKHQRUtils;

import java.io.Serializable;
import java.nio.charset.StandardCharsets;
import java.util.Calendar;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TimeZone;


public class MerchantPresentedMode implements Serializable {

    // Payload Format Indicator
    private TagLengthString payloadFormatIndicator;

    // Point of Initiation Method
    private TagLengthString pointOfInitiationMethod;

    private TagLengthString upiAccountInformation;

    // Merchant Account Information
    private final Map merchantAccountInformation = new LinkedHashMap<>();

    // Merchant Category Code
    private TagLengthString merchantCategoryCode;

    // Transaction Currency
    private TagLengthString transactionCurrency;

    // Transaction Amount
    private TagLengthString transactionAmount;

    private TagLengthString countryCode;

    // Merchant Name
    private TagLengthString merchantName;

    // Merchant City
    private TagLengthString merchantCity;

    // Additional Data Field Template
    private AdditionalDataFieldTemplate additionalDataField;

    // Merchant Information Language
    private MerchantInformationLanguageTemplate merchantInformationLanguage;

    // Additional Data Field Template
    private RfuForKhqrTemplate rfuForKhqr;


  
    public final void setPayloadFormatIndicator(final String payloadFormatIndicator) {
        this.payloadFormatIndicator = new TagLengthString(KHQRMerchantPresentedCodes.PAYLOAD_FORMAT_INDICATOR, payloadFormatIndicator);
    }

    public final void setPointOfInitiationMethod(final String pointOfInitiationMethod) {
        this.pointOfInitiationMethod = new TagLengthString(KHQRMerchantPresentedCodes.POINT_OF_INITIATION_METHOD, pointOfInitiationMethod);
    }
    public final void setUpiAccountInformation(final String upiAccountInformation) {
        this.upiAccountInformation = new TagLengthString(KHQRMerchantPresentedCodes.UPI_ACCOUNT_INFORMATION, upiAccountInformation);
    }

    public final void setMerchantCategoryCode(final String merchantCategoryCode) {
        this.merchantCategoryCode = new TagLengthString(KHQRMerchantPresentedCodes.MERCHANT_CATEGORY_CODE, merchantCategoryCode);
    }

    public final void setTransactionCurrency(final String transactionCurrency) {
        this.transactionCurrency = new TagLengthString(KHQRMerchantPresentedCodes.TRANSACTION_CURRENCY, transactionCurrency);
    }

    public final void setTransactionAmount(final String transactionAmount) {
        this.transactionAmount = new TagLengthString(KHQRMerchantPresentedCodes.TRANSACTION_AMOUNT, transactionAmount);
    }

    public final void setCountryCode(final String countryCode) {
        this.countryCode = new TagLengthString(KHQRMerchantPresentedCodes.COUNTRY_CODE, countryCode);
    }

    public final void setMerchantName(final String merchantName) {
        this.merchantName = new TagLengthString(KHQRMerchantPresentedCodes.MERCHANT_NAME, merchantName);
    }

    public final void setMerchantCity(final String merchantCity) {
        this.merchantCity = new TagLengthString(KHQRMerchantPresentedCodes.MERCHANT_CITY, merchantCity);
    }


    public final void addMerchantAccountInformation(final MerchantAccountInformationTemplate merchantAccountInformation) {
        this.merchantAccountInformation.put(merchantAccountInformation.getTag(), merchantAccountInformation);
    }

    public void setAdditionalDataField(final AdditionalDataFieldTemplate additionalDataField) {
        this.additionalDataField = additionalDataField;
    }

    public void setMerchantInformationLanguage(final MerchantInformationLanguageTemplate merchantInformationLanguage) {
        this.merchantInformationLanguage = merchantInformationLanguage;
    }

    private void setRfuForKhqr(){
        RfuForKhqr rfuForKhqr = new RfuForKhqr();
        rfuForKhqr.setTimeStamp(String.valueOf(Calendar.getInstance(TimeZone.getTimeZone("UTC")).getTimeInMillis()));

        RfuForKhqrTemplate rfuForKhqrTemplate = new RfuForKhqrTemplate();
        rfuForKhqrTemplate.setValue(rfuForKhqr);
        this.rfuForKhqr =  rfuForKhqrTemplate;

    }


    @Override
    public String toString() {

        setRfuForKhqr();

        final StringBuilder sb = new StringBuilder(this.toStringWithoutCrc16());

        final String string = sb.toString();

        if (StringUtils.isBlank(string)) {
            return StringUtils.EMPTY;
        }

        final int crc16 = CRC.crc16(sb.toString().getBytes(StandardCharsets.UTF_8));

        sb.append(String.format("%04X", crc16));

        return sb.toString();
    }

    public String toStringWithoutCrc16() {
        final StringBuilder sb = new StringBuilder();

        sb.append(BakongKHQRUtils.ofNullable(payloadFormatIndicator));
        sb.append(BakongKHQRUtils.ofNullable(pointOfInitiationMethod));
        sb.append(BakongKHQRUtils.ofNullable(upiAccountInformation));

        for (final Map.Entry entry : merchantAccountInformation.entrySet()) {
            sb.append(BakongKHQRUtils.ofNullable(entry.getValue()));
        }
        sb.append(BakongKHQRUtils.ofNullable(merchantCategoryCode));
        sb.append(BakongKHQRUtils.ofNullable(transactionCurrency));
        sb.append(BakongKHQRUtils.ofNullable(transactionAmount));
        sb.append(BakongKHQRUtils.ofNullable(countryCode));
        sb.append(BakongKHQRUtils.ofNullable(merchantName));
        sb.append(BakongKHQRUtils.ofNullable(merchantCity));
        sb.append(BakongKHQRUtils.ofNullable(additionalDataField));
        sb.append(BakongKHQRUtils.ofNullable(merchantInformationLanguage));
        sb.append(BakongKHQRUtils.ofNullable(rfuForKhqr));

        final String string = sb.toString();

        if (StringUtils.isBlank(string)) {
            return StringUtils.EMPTY;
        }

        sb.append(String.format("%s%s", KHQRMerchantPresentedCodes.CRC, "04"));

        return sb.toString();
    }
}