package com.cashuwallet.android.crypto;
import com.cashuwallet.android.Network;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.math.BigInteger;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
public class BlockcypherAPI implements Service {
private final String baseUrl;
private final int confirmations;
public BlockcypherAPI(String baseUrl) {
this(baseUrl, 0);
}
public BlockcypherAPI(String baseUrl, int confirmations) {
this.baseUrl = baseUrl;
this.confirmations = confirmations;
}
private String urlFetch(String url) throws IOException {
return urlFetch(url, null);
}
private String urlFetch(String url, String content) throws IOException {
try {
return content == null ? Network.urlFetch(url) : Network.urlFetch(url, content);
} catch (FileNotFoundException e) {
}
try {
Thread.sleep(60000);
} catch (InterruptedException e) {
throw new IOException(e.getMessage());
}
return Network.urlFetch(url, content);
}
@Override
public long getHeight() {
try {
String url = baseUrl;
JSONObject data = new JSONObject(urlFetch(url));
return data.getLong("height");
} catch (Exception e) {
return -1;
}
}
@Override
public BigInteger getFeeEstimate() {
try {
String url = baseUrl;
JSONObject data = new JSONObject(urlFetch(url));
if (confirmations > 6) {
return BigInteger.valueOf(data.optLong("low_fee_per_kb", 0));
}
if (confirmations > 2) {
return BigInteger.valueOf(data.optLong("medium_fee_per_kb", 0));
}
if (confirmations > 0) {
return BigInteger.valueOf(data.optLong("high_fee_per_kb", 0));
}
return BigInteger.valueOf(data.optLong("low_gas_price", 0));
} catch (Exception e) {
return null;
}
}
@Override
public BigInteger getBalance(String address) {
try {
String url = baseUrl + "/addrs/" + address+ "/balance";
JSONObject data = new JSONObject(urlFetch(url));
long balance = data.getLong("final_balance");
return BigInteger.valueOf(balance);
} catch (Exception e) {
return null;
}
}
@Override
public List<HistoryItem> getHistory(String address, long height) {
if (confirmations != 0)
try {
String url = baseUrl + "/addrs/" + address + "/full?after=" + height + "&limit=50";
JSONObject data = new JSONObject(urlFetch(url));
List<HistoryItem> list = new ArrayList<>();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
JSONArray items = data.optJSONArray("txs");
if (items != null) {
for (int i = 0; i < items.length(); i++) {
JSONObject item = items.getJSONObject(i);
String hash = item.getString("hash");
long block = item.optLong("block_height", Long.MAX_VALUE);
if (block < 0) block = Long.MAX_VALUE;
String timestamp = item.optString("confirmed", "");
int time = timestamp.equals("") ? 0 : (int) (dateFormat.parse(timestamp).getTime() / 1000);
BigInteger fee = BigInteger.valueOf(item.optLong("fees", 0));
BigInteger amount = BigInteger.ZERO;
JSONArray inputs = item.optJSONArray("inputs");
if (inputs != null) {
for (int j = 0; j < inputs.length(); j++) {
JSONObject input = inputs.getJSONObject(j);
BigInteger value = BigInteger.valueOf(input.optLong("output_value", 0));
JSONArray addresses = input.optJSONArray("addresses");
if (addresses != null) {
boolean found = false;
for (int k = 0; k < addresses.length(); k++) {
String source = addresses.optString(k, null);
if (address.equals(source)) {
found = true;
break;
}
}
if (found) amount = amount.subtract(value);
}
}
}
JSONArray outputs = item.optJSONArray("outputs");
if (outputs != null) {
for (int j = 0; j < outputs.length(); j++) {
JSONObject output = outputs.getJSONObject(j);
BigInteger value = BigInteger.valueOf(output.optLong("value", 0));
JSONArray addresses = output.optJSONArray("addresses");
if (addresses != null) {
boolean found = false;
for (int k = 0; k < addresses.length(); k++) {
String target = addresses.optString(k, null);
if (address.equals(target)) {
found = true;
break;
}
}
if (found) amount = amount.add(value);
}
}
}
HistoryItem o = new HistoryItem();
o.hash = hash;
o.time = time;
o.block = block;
o.amount = amount;
o.fee = fee;
list.add(o);
}
}
return list;
} catch (Exception e) {
return null;
}
else
try {
String url = baseUrl + "/addrs/" + address + "?after=" + height + "&limit=50";
JSONObject data = new JSONObject(urlFetch(url));
List<HistoryItem> list = new ArrayList<>();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
JSONArray items1 = data.optJSONArray("txrefs");
if (items1 != null) {
for (int i = 0; i < items1.length(); i++) {
JSONObject item = items1.getJSONObject(i);
String hash = item.getString("tx_hash");
long block = item.optLong("block_height", Long.MAX_VALUE);
if (block < 0) block = Long.MAX_VALUE;
String timestamp = item.optString("confirmed", "");
int time = timestamp.equals("") ? 0 : (int) (dateFormat.parse(timestamp).getTime() / 1000);
BigInteger fee = BigInteger.ZERO; // TODO missing fee
BigInteger amount = BigInteger.valueOf(item.optLong("value", 0));
if (item.getInt("tx_output_n") == -1) amount = amount.negate();
HistoryItem o = new HistoryItem();
o.hash = hash;
o.time = time;
o.block = block;
o.amount = amount;
o.fee = fee;
list.add(o);
}
}
JSONArray items2 = data.optJSONArray("unconfirmed_txrefs");
if (items2 != null) {
for (int i = 0; i < items2.length(); i++) {
JSONObject item = items2.getJSONObject(i);
String hash = item.getString("tx_hash");
long block = item.optLong("block_height", Long.MAX_VALUE);
if (block < 0) block = Long.MAX_VALUE;
String timestamp = item.optString("confirmed", "");
int time = timestamp.equals("") ? 0 : (int) (dateFormat.parse(timestamp).getTime() / 1000);
BigInteger fee = BigInteger.ZERO; // TODO missing fee
BigInteger amount = BigInteger.valueOf(item.optLong("value", 0));
if (item.getInt("tx_output_n") == -1) amount = amount.negate();
HistoryItem o = new HistoryItem();
o.hash = hash;
o.time = time;
o.block = block;
o.amount = amount;
o.fee = fee;
list.add(o);
}
}
return list;
} catch (Exception e) {
return null;
}
}
@Override
public List<UTXO> getUTXOs(String address) {
if (confirmations == 0) return new ArrayList<>();
try {
String url = baseUrl + "/addrs/" + address + "?unspentOnly=1";
JSONObject data = new JSONObject(urlFetch(url));
List<UTXO> list = new ArrayList<>();
JSONArray items1 = data.optJSONArray("txrefs");
if (items1 != null) {
for (int i = 0; i < items1.length(); i++) {
JSONObject item = items1.getJSONObject(i);
String hash = item.getString("tx_hash");
int index = (int) item.getLong("tx_output_n");
BigInteger amount = BigInteger.valueOf(item.getLong("value"));
boolean spent = item.optBoolean("spent", true);
if (spent) continue;
UTXO o = new UTXO();
o.hash = hash;
o.index = index;
o.amount = amount;
list.add(o);
}
}
JSONArray items2 = data.optJSONArray("unconfirmed_txrefs");
if (items2 != null) {
for (int i = 0; i < items2.length(); i++) {
JSONObject item = items2.getJSONObject(i);
String hash = item.getString("tx_hash");
int index = (int) item.getLong("tx_output_n");
BigInteger amount = BigInteger.valueOf(item.getLong("value"));
boolean spent = item.optBoolean("spent", true);
if (spent) continue;
UTXO o = new UTXO();
o.hash = hash;
o.index = index;
o.amount = amount;
list.add(o);
}
}
return list;
} catch (Exception e) {
return null;
}
}
@Override
public long getSequence(String address) {
if (confirmations != 0) return 0;
try {
String url = baseUrl + "/addrs/" + address+ "/balance";
JSONObject data = new JSONObject(urlFetch(url));
return data.getLong("nonce");
} catch (Exception e) {
return -1;
}
}
@Override
public String broadcast(String transaction) {
try {
String url = baseUrl + "/txs/push";
String content = "{\"tx\":\"" + transaction + "\"}";
JSONObject data = new JSONObject(urlFetch(url, content));
return data.getString("hash");
} catch (Exception e) {
return null;
}
}
@Override
public Object custom(String name, Object arg) {
return null;
}
}
