com.github.devnied.emvnfccard.iso7816emv.EmvTerminal.java Source code

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Here is the source code for com.github.devnied.emvnfccard.iso7816emv.EmvTerminal.java

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/*
 * Copyright (C) 2013 MILLAU Julien
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.devnied.emvnfccard.iso7816emv;

import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.commons.lang3.StringUtils;

import com.github.devnied.emvnfccard.model.enums.CountryCodeEnum;
import com.github.devnied.emvnfccard.model.enums.CurrencyEnum;
import com.github.devnied.emvnfccard.model.enums.TransactionTypeEnum;

import fr.devnied.bitlib.BytesUtils;

/**
 * Factory to create Tag value
 *
 * @author Millau Julien
 *
 */
public final class EmvTerminal {

    /**
     * Random
     */
    private static final SecureRandom random = new SecureRandom();

    /**
     * Method used to construct value from tag and length
     *
     * @param pTagAndLength
     *            tag and length value
     * @return tag value in byte
     */
    public static byte[] constructValue(final TagAndLength pTagAndLength) {
        byte ret[] = new byte[pTagAndLength.getLength()];
        byte val[] = null;
        if (pTagAndLength.getTag() == EmvTags.TERMINAL_TRANSACTION_QUALIFIERS) {
            TerminalTransactionQualifiers terminalQual = new TerminalTransactionQualifiers();
            terminalQual.setContactlessEMVmodeSupported(true);
            terminalQual.setReaderIsOfflineOnly(true);
            val = terminalQual.getBytes();
        } else if (pTagAndLength.getTag() == EmvTags.TERMINAL_COUNTRY_CODE) {
            val = BytesUtils.fromString(StringUtils.leftPad(String.valueOf(CountryCodeEnum.FR.getNumeric()),
                    pTagAndLength.getLength() * 2, "0"));
        } else if (pTagAndLength.getTag() == EmvTags.TRANSACTION_CURRENCY_CODE) {
            val = BytesUtils.fromString(StringUtils.leftPad(String.valueOf(CurrencyEnum.EUR.getISOCodeNumeric()),
                    pTagAndLength.getLength() * 2, "0"));
        } else if (pTagAndLength.getTag() == EmvTags.TRANSACTION_DATE) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyMMdd");
            val = BytesUtils.fromString(sdf.format(new Date()));
        } else if (pTagAndLength.getTag() == EmvTags.TRANSACTION_TYPE) {
            val = new byte[] { (byte) TransactionTypeEnum.PURCHASE.getKey() };
        } else if (pTagAndLength.getTag() == EmvTags.AMOUNT_AUTHORISED_NUMERIC) {
            val = BytesUtils.fromString("00");
        } else if (pTagAndLength.getTag() == EmvTags.TERMINAL_TYPE) {
            val = new byte[] { 0x22 };
        } else if (pTagAndLength.getTag() == EmvTags.TERMINAL_CAPABILITIES) {
            val = new byte[] { (byte) 0xE0, (byte) 0xA0, 0x00 };
        } else if (pTagAndLength.getTag() == EmvTags.ADDITIONAL_TERMINAL_CAPABILITIES) {
            val = new byte[] { (byte) 0x8e, (byte) 0, (byte) 0xb0, 0x50, 0x05 };
        } else if (pTagAndLength.getTag() == EmvTags.DS_REQUESTED_OPERATOR_ID) {
            val = BytesUtils.fromString("7345123215904501");
        } else if (pTagAndLength.getTag() == EmvTags.UNPREDICTABLE_NUMBER) {
            random.nextBytes(ret);
        }
        if (val != null) {
            System.arraycopy(val, 0, ret, 0, Math.min(val.length, ret.length));
        }
        return ret;
    }

    /**
     * Private Constructor
     */
    private EmvTerminal() {
    }

}