Updated on 2026-08-14
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Tangem
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78 changed files with 229 additions and 247 deletions
373
app/src/main/java/com/tangem/wallet/CoinEngine.java
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373
app/src/main/java/com/tangem/wallet/CoinEngine.java
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package com.tangem.wallet;
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import android.net.Uri;
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import android.text.InputFilter;
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import com.tangem.card_common.reader.CardProtocol;
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import com.tangem.card_common.tasks.SignTask;
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import java.io.IOException;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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import java.math.RoundingMode;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.text.DecimalFormat;
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import java.text.DecimalFormatSymbols;
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import java.util.Locale;
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import co.nstant.in.cbor.CborException;
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/**
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* Created by Ilia on 15.02.2018.
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*/
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public abstract class CoinEngine {
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public static class InternalAmount extends BigDecimal {
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private String currency;
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public InternalAmount() {
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super(0);
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currency = "";
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}
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public InternalAmount(String amountString, String currency) {
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super(amountString.replace(',', '.'));
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this.currency = currency;
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}
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public InternalAmount(long amount, String currency) {
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super(amount);
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this.currency = currency;
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}
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public InternalAmount(BigDecimal amount, String currency) {
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super(amount.unscaledValue(), amount.scale());
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this.currency = currency;
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}
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public InternalAmount(BigInteger amount, String currency) {
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super(new BigDecimal(amount).unscaledValue(), new BigDecimal(amount).scale());
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this.currency = currency;
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}
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public boolean notZero() {
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return compareTo(BigDecimal.ZERO) > 0;
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}
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public boolean isZero() {
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return compareTo(BigDecimal.ZERO) == 0;
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}
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public String getCurrency() {
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return currency;
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}
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public String toValueString(int decimals) {
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DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.US);
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symbols.setDecimalSeparator('.');
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DecimalFormat df = new DecimalFormat();
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df.setDecimalFormatSymbols(symbols);
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df.setMaximumFractionDigits(decimals);
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df.setMinimumFractionDigits(0);
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df.setGroupingUsed(false);
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BigDecimal bd = new BigDecimal(unscaledValue(), scale());
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bd.setScale(decimals, ROUND_DOWN);
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return df.format(bd);
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}
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public String toValueString() {
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return toValueString(scale());
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}
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@Override
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public String toString() {
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return super.toString();
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}
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}
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public static class Amount extends BigDecimal {
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private String currency;
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public Amount() {
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super(0);
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currency = "";
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}
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public Amount(String amountString, String currency) {
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super(amountString.replace(',', '.'));
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this.currency = currency;
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}
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public Amount(Long amount, String currency) {
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super(amount);
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this.currency = currency;
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}
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public Amount(BigDecimal amount, String currency) {
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super(amount.unscaledValue(), amount.scale());
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this.currency = currency;
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}
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public String getCurrency() {
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return currency;
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}
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@Override
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public String toString() {
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return super.toString() + " " + currency;
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}
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public boolean notZero() {
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return compareTo(BigDecimal.ZERO) > 0;
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}
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public String toDescriptionString(int decimals) {
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return toValueString(decimals) + " " + currency;
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}
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public String toValueString(int decimals) {
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DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.US);
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symbols.setDecimalSeparator('.');
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DecimalFormat df = new DecimalFormat();
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df.setDecimalFormatSymbols(symbols);
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df.setMaximumFractionDigits(decimals);
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df.setMinimumFractionDigits(0);
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df.setGroupingUsed(false);
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BigDecimal bd = new BigDecimal(unscaledValue(), scale());
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bd.setScale(decimals, ROUND_DOWN);
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return df.format(bd);
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}
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public String toValueString() {
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return toValueString(scale());
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}
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public String toEquivalentString(double rateValue) {
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if (rateValue > 0) {
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BigDecimal biRate = new BigDecimal(rateValue);
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BigDecimal exchangeCurs = biRate.multiply(this);
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exchangeCurs = exchangeCurs.setScale(2, RoundingMode.DOWN);
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return "≈ USD " + exchangeCurs.toString();
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} else {
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return "";
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}
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}
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public boolean isZero() {
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return compareTo(BigDecimal.ZERO) == 0;
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}
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}
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protected TangemContext ctx;
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public CoinEngine() {
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}
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public CoinEngine(TangemContext ctx) {
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this.ctx = ctx;
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}
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public abstract boolean awaitingConfirmation();
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public abstract boolean hasBalanceInfo();
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public abstract boolean isBalanceNotZero();
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// TODO - return string message
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public abstract boolean isExtractPossible();
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public abstract Uri getWalletExplorerUri();
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public abstract Uri getShareWalletUri();
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public abstract boolean checkNewTransactionAmount(Amount amount);
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public abstract boolean checkNewTransactionAmountAndFee(Amount amount, Amount fee, Boolean isFeeIncluded);
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public abstract boolean validateBalance(BalanceValidator balanceValidator);
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public abstract Amount getBalance();
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public abstract String getBalanceHTML();
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public abstract String getBalanceCurrency();
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public abstract InputFilter[] getAmountInputFilters();
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public abstract String getOfflineBalanceHTML();
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public abstract String evaluateFeeEquivalent(String fee);
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public abstract String getFeeCurrency();
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public abstract boolean isNeedCheckNode();
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public abstract String getBalanceEquivalent();
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public abstract boolean validateAddress(String address);
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public abstract String calculateAddress(byte[] pkUncompressed) throws NoSuchProviderException, NoSuchAlgorithmException, CborException, IOException, Exception;
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public abstract Amount convertToAmount(InternalAmount internalAmount) throws Exception;
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public abstract Amount convertToAmount(String strAmount, String currency);
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public abstract InternalAmount convertToInternalAmount(Amount amount) throws Exception;
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public abstract InternalAmount convertToInternalAmount(byte[] bytes) throws Exception;
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public abstract byte[] convertToByteArray(InternalAmount internalAmount) throws Exception;
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public abstract CoinData createCoinData();
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public abstract String getUnspentInputsDescription();
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public void defineWallet() throws CardProtocol.TangemException {
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try {
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String wallet = calculateAddress(ctx.getCard().getWalletPublicKey());
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ctx.getCoinData().setWallet(wallet);
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} catch (Exception e) {
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ctx.getCoinData().setWallet("ERROR");
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throw new CardProtocol.TangemException("Can't define wallet address");
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}
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}
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/**
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* Create instance of {@link SignTask.TransactionToSign} used for transaction signing and sending
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*
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* Transaction processing sequence:
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* 1. User enter transaction attributes
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* 2. Application create instance of {@link SignTask.TransactionToSign} by call {@see constructTransaction}
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* 3. Application set notification when transaction were prepared {@see setOnNeedSendTransaction} and init {@link SignTask}
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* 4. User tap card and card sign transaction
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* 5. Application receive {@link OnNeedSendTransaction} notification with prepared raw transaction
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* 6. Application show user information that transaction ready for sending and init sending procedure by call {@see requestSendTransaction}
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* 7. Application receive notification of sending result through {@link CoinEngine.BlockchainRequestsCallbacks} and show result to user
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*
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* @param amountValue - amount of desired transaction
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* @param feeValue - fee amount of desired transaction
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* @param IncFee - true if fee amount is included in amountValue (amountValue is total amount of transaction)
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* @param targetAddress - target address of transaction
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* @return instance of {@link SignTask.TransactionToSign}
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* @throws Exception if something goes wrong
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*/
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public abstract SignTask.TransactionToSign constructTransaction(Amount amountValue, Amount feeValue, boolean IncFee, String targetAddress) throws Exception;
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/**
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* Interface used to notify main application when new transaction is prepared to send
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*/
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public interface OnNeedSendTransaction {
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void onTransactionPrepared(byte[] txForSend);
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}
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protected OnNeedSendTransaction onNeedSendTransaction;
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/**
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* Set notification callback when new transaction is prepared to send
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*/
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public void setOnNeedSendTransaction(OnNeedSendTransaction onNeedSendTransaction) {
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this.onNeedSendTransaction = onNeedSendTransaction;
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}
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protected void notifyOnNeedSendTransaction(byte[] txForSend) throws Exception {
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if (onNeedSendTransaction == null)
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throw new Exception("Transaction was signed but no callback defined to send!");
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onNeedSendTransaction.onTransactionPrepared(txForSend);
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}
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/**
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* Interface used to notify/querying application during processing sequence of request to blockchain nodes/servers
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*/
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public interface BlockchainRequestsCallbacks {
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/**
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* Notification that the all requests in sequence completed
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* Call after a last request completed
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* If occurred error return in {@link TangemContext} {@see TangemContext.getError()}
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*
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* @param success -*
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*/
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void onComplete(Boolean success);
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/**
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* Notification that a new part of data received and it's possible to update view
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* May call when some request in the sequence completed but there are still a few requests left
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*/
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void onProgress();
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/**
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* Return flag that allow to add new or re-requests in the sequence
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* Call between requests or when request fail and before re-request
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*
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* @return true if not need terminate (e.g. activity is online)
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*/
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boolean allowAdvance();
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}
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/**
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* Start sequence of request to blockchain nodes needed to get balance and other information (for example unspent transaction) needed to
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* show current state of wallet and prepare new withdrawal transaction
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* Save result in {@link CoinData}
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* If occurred error can be get at onComplete callback in {@link TangemContext}.getError()
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* @param blockchainRequestsCallbacks - notifications
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* @throws Exception if something goes wrong
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*/
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public abstract void requestBalanceAndUnspentTransactions(BlockchainRequestsCallbacks blockchainRequestsCallbacks) throws Exception;
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/**
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* Start sequence of request to blockchain nodes needed to get fee amount for a new transaction
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* Save result in {@link CoinData} minFee, maxFee, normalFee
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* @param blockchainRequestsCallbacks - notifications
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* @throws Exception if something goes wrong
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*/
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public abstract void requestFee(BlockchainRequestsCallbacks blockchainRequestsCallbacks, String targetAddress, Amount amount) throws Exception;
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/**
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* Start sequence of request to blockchain nodes needed to send new transaction
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* If occurred error can be get at onComplete callback in {@link TangemContext}.getError()
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* @param blockchainRequestsCallbacks - notifications
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* @throws Exception if something goes wrong
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*/
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public abstract void requestSendTransaction(BlockchainRequestsCallbacks blockchainRequestsCallbacks, byte[] txForSend) throws Exception;
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/**
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* @return true if blockchain need multiple lines to show balance (e.g. need show additional balance information, Token count for example)
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*/
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public boolean needMultipleLinesForBalance() {
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return false;
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}
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/**
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* @return true to allow user select fee level - min, normal or priority
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*/
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public boolean allowSelectFeeLevel() {
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return true;
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}
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/**
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* @return true to allow user select include or exclude fee
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*/
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public boolean allowSelectFeeInclusion() {
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return true;
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}
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public boolean isNftToken() {
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return false;
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}
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public int pendingTransactionTimeoutInSeconds() { return 30; }
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}
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