Integrate Bitpay exchange rate API

Add a Bitpay exchange rate provider and corresponding unit test.

pricenode/src/main/java/bisq/price/spot/providers/Bitpay.java

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+/*
+ * This file is part of Bisq.
+ *
+ * Bisq is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Bisq 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 Affero General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Bisq. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package bisq.price.spot.providers;
+
+import bisq.price.spot.ExchangeRate;
+import bisq.price.spot.ExchangeRateProvider;
+import bisq.price.util.bitpay.BitpayMarketData;
+import bisq.price.util.bitpay.BitpayTicker;
+
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.RequestEntity;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import java.time.Duration;
+
+import java.util.Arrays;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+
+@Component
+class Bitpay extends ExchangeRateProvider {
+
+    private final RestTemplate restTemplate = new RestTemplate();
+
+    public Bitpay() {
+        super("BITPAY", "bitpay", Duration.ofMinutes(1));
+    }
+
+    @Override
+    public Set<ExchangeRate> doGet() {
+
+        Set<ExchangeRate> result = new HashSet<ExchangeRate>();
+
+        Predicate<BitpayTicker> isDesiredFiatPair = t -> SUPPORTED_FIAT_CURRENCIES.contains(t.getCode());
+        Predicate<BitpayTicker> isDesiredCryptoPair = t -> SUPPORTED_CRYPTO_CURRENCIES.contains(t.getCode());
+
+        getTickers()
+                .filter(isDesiredFiatPair.or(isDesiredCryptoPair))
+                .forEach(ticker -> {
+                    result.add(new ExchangeRate(
+                            ticker.getCode(),
+                            ticker.getRate(),
+                            new Date(),
+                            this.getName()
+                    ));
+                });
+
+        return result;
+    }
+
+    private Stream<BitpayTicker> getTickers() {
+        BitpayMarketData marketData = restTemplate.exchange(
+                RequestEntity
+                        .get(UriComponentsBuilder
+                                .fromUriString("https://bitpay.com/rates").build()
+                                .toUri())
+                        .build(),
+                new ParameterizedTypeReference<BitpayMarketData>() {
+                }
+        ).getBody();
+
+        return Arrays.stream(marketData.getData());
+    }
+}

pricenode/src/main/java/bisq/price/util/bitpay/BitpayMarketData.java

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+package bisq.price.util.bitpay;
+
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class BitpayMarketData {
+
+    private BitpayTicker[] data;
+
+}

pricenode/src/main/java/bisq/price/util/bitpay/BitpayTicker.java

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+package bisq.price.util.bitpay;
+
+import java.math.BigDecimal;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class BitpayTicker {
+
+    private String code;
+
+    private String name;
+
+    private BigDecimal rate;
+
+}

pricenode/src/test/java/bisq/price/spot/providers/BitpayTest.java

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+/*
+ * This file is part of Bisq.
+ *
+ * Bisq is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Bisq 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 Affero General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Bisq. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package bisq.price.spot.providers;
+
+import bisq.price.AbstractExchangeRateProviderTest;
+
+import lombok.extern.slf4j.Slf4j;
+
+import org.junit.jupiter.api.Test;
+
+@Slf4j
+public class BitpayTest extends AbstractExchangeRateProviderTest {
+
+    @Test
+    public void doGet_successfulCall() {
+        doGet_successfulCall(new Bitpay());
+    }
+
+}