Java tutorial
/* * Copyright 2011-2014 the original author or authors. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.cannabiscoin.wallet; import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.Reader; import java.math.BigInteger; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.*; import javax.annotation.CheckForNull; import javax.annotation.Nonnull; import com.google.bitcoin.core.CoinDefinition; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import android.content.ContentProvider; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.MatrixCursor; import android.net.Uri; import android.preference.PreferenceManager; import android.provider.BaseColumns; import android.text.format.DateUtils; import com.cannabiscoin.wallet.util.GenericUtils; import com.cannabiscoin.wallet.util.Io; /** * @author Andreas Schildbach */ public class ExchangeRatesProvider extends ContentProvider { public static class ExchangeRate { public ExchangeRate(@Nonnull final String currencyCode, @Nonnull final BigInteger rate, final String source) { this.currencyCode = currencyCode; this.rate = rate; this.source = source; } public final String currencyCode; public final BigInteger rate; public final String source; @Override public String toString() { return getClass().getSimpleName() + '[' + currencyCode + ':' + GenericUtils.formatValue(rate, Constants.BTC_MAX_PRECISION, 0) + ']'; } } public static final String KEY_CURRENCY_CODE = "currency_code"; private static final String KEY_RATE = "rate"; private static final String KEY_SOURCE = "source"; public static final String QUERY_PARAM_Q = "q"; private Configuration config; private String userAgent; @CheckForNull private Map<String, ExchangeRate> exchangeRates = null; private long lastUpdated = 0; private static final URL BITCOINAVERAGE_URL; private static final String[] BITCOINAVERAGE_FIELDS = new String[] { "24h_avg", "last" }; private static final URL BLOCKCHAININFO_URL; private static final String[] BLOCKCHAININFO_FIELDS = new String[] { "15m" }; private static final URL BITTREX_URL; // https://bitmarket.eu/api/ticker static { try { BITCOINAVERAGE_URL = new URL("https://api.bitcoinaverage.com/ticker/global/all"); BLOCKCHAININFO_URL = new URL("https://blockchain.info/ticker"); BITTREX_URL = new URL("https://bittrex.com/api/v1.1/public/getticker?market=BTC-CANN"); } catch (final MalformedURLException x) { throw new RuntimeException(x); // cannot happen } } private static final long UPDATE_FREQ_MS = 10 * DateUtils.MINUTE_IN_MILLIS; private static final Logger log = LoggerFactory.getLogger(ExchangeRatesProvider.class); @Override public boolean onCreate() { final Context context = getContext(); this.config = new Configuration(PreferenceManager.getDefaultSharedPreferences(context)); this.userAgent = WalletApplication .httpUserAgent(WalletApplication.packageInfoFromContext(context).versionName); final ExchangeRate cachedExchangeRate = config.getCachedExchangeRate(); if (cachedExchangeRate != null) { exchangeRates = new TreeMap<String, ExchangeRate>(); exchangeRates.put(cachedExchangeRate.currencyCode, cachedExchangeRate); } return true; } public static Uri contentUri(@Nonnull final String packageName) { return Uri.parse("content://" + packageName + '.' + "exchange_rates"); } @Override public Cursor query(final Uri uri, final String[] projection, final String selection, final String[] selectionArgs, final String sortOrder) { final long now = System.currentTimeMillis(); if (lastUpdated == 0 || now - lastUpdated > UPDATE_FREQ_MS) { Map<String, ExchangeRate> newExchangeRates = null; if (newExchangeRates == null) newExchangeRates = requestExchangeRates(BITCOINAVERAGE_URL, userAgent, BITCOINAVERAGE_FIELDS); if (newExchangeRates == null) newExchangeRates = requestExchangeRates(BLOCKCHAININFO_URL, userAgent, BLOCKCHAININFO_FIELDS); if (newExchangeRates != null) { exchangeRates = newExchangeRates; lastUpdated = now; final ExchangeRate exchangeRateToCache = bestExchangeRate(config.getExchangeCurrencyCode()); if (exchangeRateToCache != null) config.setCachedExchangeRate(exchangeRateToCache); } } if (exchangeRates == null) return null; final MatrixCursor cursor = new MatrixCursor( new String[] { BaseColumns._ID, KEY_CURRENCY_CODE, KEY_RATE, KEY_SOURCE }); if (selection == null) { for (final Map.Entry<String, ExchangeRate> entry : exchangeRates.entrySet()) { final ExchangeRate rate = entry.getValue(); cursor.newRow().add(rate.currencyCode.hashCode()).add(rate.currencyCode).add(rate.rate.longValue()) .add(rate.source); } } else if (selection.equals(QUERY_PARAM_Q)) { final String selectionArg = selectionArgs[0].toLowerCase(Locale.US); for (final Map.Entry<String, ExchangeRate> entry : exchangeRates.entrySet()) { final ExchangeRate rate = entry.getValue(); final String currencyCode = rate.currencyCode; final String currencySymbol = GenericUtils.currencySymbol(currencyCode); if (currencyCode.toLowerCase(Locale.US).contains(selectionArg) || currencySymbol.toLowerCase(Locale.US).contains(selectionArg)) cursor.newRow().add(currencyCode.hashCode()).add(currencyCode).add(rate.rate.longValue()) .add(rate.source); } } else if (selection.equals(KEY_CURRENCY_CODE)) { final String selectionArg = selectionArgs[0]; final ExchangeRate rate = bestExchangeRate(selectionArg); if (rate != null) cursor.newRow().add(rate.currencyCode.hashCode()).add(rate.currencyCode).add(rate.rate.longValue()) .add(rate.source); } return cursor; } private ExchangeRate bestExchangeRate(final String currencyCode) { ExchangeRate rate = currencyCode != null ? exchangeRates.get(currencyCode) : null; if (rate != null) return rate; final String defaultCode = defaultCurrencyCode(); rate = defaultCode != null ? exchangeRates.get(defaultCode) : null; if (rate != null) return rate; return exchangeRates.get(Constants.DEFAULT_EXCHANGE_CURRENCY); } private String defaultCurrencyCode() { try { return Currency.getInstance(Locale.getDefault()).getCurrencyCode(); } catch (final IllegalArgumentException x) { return null; } } public static ExchangeRate getExchangeRate(@Nonnull final Cursor cursor) { final String currencyCode = cursor .getString(cursor.getColumnIndexOrThrow(ExchangeRatesProvider.KEY_CURRENCY_CODE)); final BigInteger rate = BigInteger .valueOf(cursor.getLong(cursor.getColumnIndexOrThrow(ExchangeRatesProvider.KEY_RATE))); final String source = cursor.getString(cursor.getColumnIndexOrThrow(ExchangeRatesProvider.KEY_SOURCE)); return new ExchangeRate(currencyCode, rate, source); } @Override public Uri insert(final Uri uri, final ContentValues values) { throw new UnsupportedOperationException(); } @Override public int update(final Uri uri, final ContentValues values, final String selection, final String[] selectionArgs) { throw new UnsupportedOperationException(); } @Override public int delete(final Uri uri, final String selection, final String[] selectionArgs) { throw new UnsupportedOperationException(); } @Override public String getType(final Uri uri) { throw new UnsupportedOperationException(); } private static Object getCoinValueBTC() { Date date = new Date(); long now = date.getTime(); //final Map<String, ExchangeRate> rates = new TreeMap<String, ExchangeRate>(); // Keep the LTC rate around for a bit Double btcRate = 0.0; String currencyCryptsy = CoinDefinition.cryptsyMarketCurrency; String urlCryptsy = "http://pubapi.cryptsy.com/api.php?method=singlemarketdata&marketid=" + CoinDefinition.cryptsyMarketId; HttpURLConnection connectionCryptsy = null; try { // final String currencyCode = currencies[i]; final URL URLCryptsy = new URL(urlCryptsy); connectionCryptsy = (HttpURLConnection) URLCryptsy.openConnection(); connectionCryptsy.setConnectTimeout(Constants.HTTP_TIMEOUT_MS * 2); connectionCryptsy.setReadTimeout(Constants.HTTP_TIMEOUT_MS * 2); connectionCryptsy.connect(); final StringBuilder contentCryptsy = new StringBuilder(); Reader reader = null; try { reader = new InputStreamReader(new BufferedInputStream(connectionCryptsy.getInputStream(), 1024)); Io.copy(reader, contentCryptsy); final JSONObject head = new JSONObject(contentCryptsy.toString()); JSONObject returnObject = head.getJSONObject("return"); JSONObject markets = returnObject.getJSONObject("markets"); JSONObject coinInfo = markets.getJSONObject(CoinDefinition.coinTicker); JSONArray recenttrades = coinInfo.getJSONArray("recenttrades"); double btcTraded = 0.0; double coinTraded = 0.0; for (int i = 0; i < recenttrades.length(); ++i) { JSONObject trade = (JSONObject) recenttrades.get(i); btcTraded += trade.getDouble("total"); coinTraded += trade.getDouble("quantity"); } Double averageTrade = btcTraded / coinTraded; //Double lastTrade = GLD.getDouble("lasttradeprice"); //String euros = String.format("%.7f", averageTrade); // Fix things like 3,1250 //euros = euros.replace(",", "."); //rates.put(currencyCryptsy, new ExchangeRate(currencyCryptsy, Utils.toNanoCoins(euros), URLCryptsy.getHost())); if (currencyCryptsy.equalsIgnoreCase("BTC")) btcRate = averageTrade; } finally { if (reader != null) { try { reader.close(); } catch (final IOException x) { // swallow } } } return btcRate; } catch (final IOException x) { x.printStackTrace(); } catch (final JSONException x) { x.printStackTrace(); } finally { if (connectionCryptsy != null) connectionCryptsy.disconnect(); } return null; } private static Object getCoinValueBTC_BTER() { Date date = new Date(); long now = date.getTime(); //final Map<String, ExchangeRate> rates = new TreeMap<String, ExchangeRate>(); // Keep the LTC rate around for a bit Double btcRate = 0.0; String currency = CoinDefinition.cryptsyMarketCurrency; String url = "https://bittrex.com/api/v1.1/public/getticker?market=BTC-CANN"; HttpURLConnection connection = null; try { // final String currencyCode = currencies[i]; final URL URL_bter = new URL(url); connection = (HttpURLConnection) URL_bter.openConnection(); connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS * 2); connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS * 2); connection.connect(); final StringBuilder content = new StringBuilder(); Reader reader = null; try { reader = new InputStreamReader(new BufferedInputStream(connection.getInputStream(), 1024)); Io.copy(reader, content); final JSONObject head = new JSONObject(content.toString()); String result = head.getString("result"); if (result.equals("true")) { Double averageTrade = head.getDouble("Bid"); if (currency.equalsIgnoreCase("BTC")) btcRate = averageTrade; } } finally { if (reader != null) { try { reader.close(); } catch (final IOException x) { // swallow } } } return btcRate; } catch (final IOException x) { x.printStackTrace(); } catch (final JSONException x) { x.printStackTrace(); } finally { if (connection != null) connection.disconnect(); } return null; } /* private static Object getCoinValueBTC_BTER() { Date date = new Date(); long now = date.getTime(); //final Map<String, ExchangeRate> rates = new TreeMap<String, ExchangeRate>(); // Keep the LTC rate around for a bit Double btcRate = 0.0; String currency = CoinDefinition.cryptsyMarketCurrency; String url = "http://data.bter.com/api/1/ticker/"+ CoinDefinition.coinTicker.toLowerCase() + "_" + CoinDefinition.cryptsyMarketCurrency.toLowerCase(); try { // final String currencyCode = currencies[i]; final URL URL_bter = new URL(url); final URLConnection connection = URL_bter.openConnection(); connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS * 2); connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS * 2); connection.connect(); final StringBuilder content = new StringBuilder(); Reader reader = null; try { reader = new InputStreamReader(new BufferedInputStream(connection.getInputStream(), 1024)); Io.copy(reader, content); final JSONObject head = new JSONObject(content.toString()); String result = head.getString("result"); if(result.equals("true")) { Double averageTrade = head.getDouble("avg"); if(currency.equalsIgnoreCase("BTC")) btcRate = averageTrade; } return btcRate; } finally { if (reader != null) reader.close(); } } catch (final IOException x) { x.printStackTrace(); } catch (final JSONException x) { x.printStackTrace(); } return null; }*/ private static Map<String, ExchangeRate> requestExchangeRates(final URL url, final String userAgent, final String... fields) { final long start = System.currentTimeMillis(); HttpURLConnection connection = null; Reader reader = null; try { Double btcRate = 0.0; boolean cryptsyValue = true; Object result = getCoinValueBTC(); if (result == null) { result = getCoinValueBTC_BTER(); cryptsyValue = false; if (result == null) return null; } btcRate = (Double) result; connection = (HttpURLConnection) url.openConnection(); connection.setInstanceFollowRedirects(false); connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS); connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS); connection.addRequestProperty("User-Agent", userAgent); connection.connect(); final int responseCode = connection.getResponseCode(); if (responseCode == HttpURLConnection.HTTP_OK) { reader = new InputStreamReader(new BufferedInputStream(connection.getInputStream(), 1024), Constants.UTF_8); final StringBuilder content = new StringBuilder(); Io.copy(reader, content); final Map<String, ExchangeRate> rates = new TreeMap<String, ExchangeRate>(); final JSONObject head = new JSONObject(content.toString()); for (final Iterator<String> i = head.keys(); i.hasNext();) { final String currencyCode = i.next(); if (!"timestamp".equals(currencyCode)) { final JSONObject o = head.getJSONObject(currencyCode); for (final String field : fields) { String rateStr = o.optString(field, null); if (rateStr != null) { try { double rateForBTC = Double.parseDouble(rateStr); rateStr = String.format("%.8f", rateForBTC * btcRate).replace(",", "."); final BigInteger rate = GenericUtils.toNanoCoins(rateStr, 0); if (rate.signum() > 0) { rates.put(currencyCode, new ExchangeRate(currencyCode, rate, url.getHost())); break; } } catch (final ArithmeticException x) { log.warn("problem fetching {} exchange rate from {}: {}", new Object[] { currencyCode, url, x.getMessage() }); } } } } } log.info("fetched exchange rates from {}, took {} ms", url, (System.currentTimeMillis() - start)); //Add Bitcoin information if (rates.size() == 0) { int i = 0; i++; } else { rates.put(CoinDefinition.cryptsyMarketCurrency, new ExchangeRate(CoinDefinition.cryptsyMarketCurrency, GenericUtils.toNanoCoins(String.format("%.8f", btcRate).replace(",", "."), 0), cryptsyValue ? "pubapi.cryptsy.com" : "data.bter.com")); rates.put("m" + CoinDefinition.cryptsyMarketCurrency, new ExchangeRate("m" + CoinDefinition.cryptsyMarketCurrency, GenericUtils.toNanoCoins( String.format("%.5f", btcRate * 1000).replace(",", "."), 0), cryptsyValue ? "pubapi.cryptsy.com" : "data.bter.com")); } return rates; } else { log.warn("http status {} when fetching {}", responseCode, url); } } catch (final Exception x) { log.warn("problem fetching exchange rates from " + url, x); } finally { if (reader != null) { try { reader.close(); } catch (final IOException x) { // swallow } } if (connection != null) connection.disconnect(); } return null; } }