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BitstampAPIConnection.java
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import java.io.IOException;
import java.net.ConnectException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.UUID;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;
/**
* Provides a facility to send both private and public API calls to Bitstamp. There is no persistent connection, each
* call a seperate connection, though the {@code HttpClient} instance persists.
*/
public class BitstampAPIConnection
{
private String defaultApiKeyPath = "key";
private String defaultApiKeySecretPath = "secretKey";
private String apiKey = null;
private String apiKeySecret = null;
private final int MAX_RETRY = 3;
/**
* Creates a new BitstampAPIConnection instance, attempting to load keys from default locations relative to the
* execution location: "key" and "secretKey", (No file extension).
*/
public BitstampAPIConnection()
{
loadKeys(defaultApiKeyPath, defaultApiKeySecretPath);
}
/**
* Creates a new BitstampAPIConnection instance, attempting to load keys from the provided locations.
*
* @param apiKeyPath path to load API Key from
* @param apiKeySecretPath path to load the API Key Scret from
*/
public BitstampAPIConnection(String apiKeyPath, String apiKeySecretPath)
{
loadKeys(apiKeyPath, apiKeySecretPath);
}
/**
* Loads keys into this instance using the provided paths.
*
* @param keyPath path to load API Key from
* @param keySecretPath path to load the API Key Scret from
*/
private void loadKeys(String keyPath, String keySecretPath)
{
try
{
apiKey = Files.readString(Paths.get(keyPath));
apiKeySecret = Files.readString(Paths.get(keySecretPath));
}
catch (IOException e)
{
apiKey = null;
apiKeySecret = null;
System.out.println("Error reading API keys - account specific functions unavailable. Please check your key files and try again.");
}
}
/**
* Send an API call to a public endpoint on Bitstamp's API.
*
* @param endPoint the endpoint to call
* @return the API endpoint response
*/
public String sendPublicRequest(String endPoint)
{
String urlHost = "www.bitstamp.net";
String urlPath = endPoint;
HttpResponse<String> response = null;
int i = 0;
while (true)
{
try
{
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://" + urlHost + urlPath))
.GET()
.build();
response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() != 200)
{
throw new BadResponseException(response.statusCode());
}
String resp = response.body();
return resp;
}
catch (BadResponseException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: Server returned bad response. Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (ConnectException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: Server failed to connect. Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
}
/**
* Send an API call to a public endpoint on Bitstamp's API.
*
* @param endPoint the endpoint to call
* @param params the parameters to send with the request
* @return the API endpoint response
*/
public String sendPublicRequest(String endPoint, String[] params)
{
String urlHost = "www.bitstamp.net";
String urlPath = endPoint;
urlPath += "?";
for (String param : params)
{
urlPath += "&" + param;
}
HttpResponse<String> response = null;
int i = 0;
while (true)
{
try
{
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://" + urlHost + urlPath))
.GET()
.build();
response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() != 200)
{
throw new BadResponseException(response.statusCode());
}
String resp = response.body();
return resp;
}
catch (BadResponseException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: Server returned bad response. Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (ConnectException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: Server failed to connect. Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
}
/**
* Send an API call to a public endpoint on Bitstamp's API.
*
* @param endPoint the endpoint to call
* @return the API endpoint response
*/
public String sendPrivateRequest(String endPoint)
{
// Check API Key and API Key Secret are present
if (this.apiKey == null || this.apiKeySecret == null)
{
throw new RuntimeException(new APIKeyMissingException());
}
String apiKey = String.format("%s %s", "BITSTAMP", this.apiKey);
String apiKeySecret = this.apiKeySecret;
String httpVerb = "POST";
String urlHost = "www.bitstamp.net";
String urlPath = endPoint;
String urlQuery = "";
String timestamp = String.valueOf(System.currentTimeMillis());
String nonce = UUID.randomUUID().toString();
String contentType = "application/x-www-form-urlencoded";
String version = "v2";
String payloadString = "offset=1";
String signature = apiKey + httpVerb + urlHost + urlPath + urlQuery + contentType + nonce + timestamp + version + payloadString;
int i = 0;
while (true)
{
try
{
SecretKeySpec secretKey = new SecretKeySpec(apiKeySecret.getBytes(), "HmacSHA256");
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(secretKey);
byte[] rawHmac = mac.doFinal(signature.getBytes());
signature = new String(Hex.encodeHex(rawHmac)).toUpperCase();
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://" + urlHost + urlPath))
.POST(HttpRequest.BodyPublishers.ofString(payloadString))
.setHeader("X-Auth", apiKey)
.setHeader("X-Auth-Signature", signature)
.setHeader("X-Auth-Nonce", nonce)
.setHeader("X-Auth-Timestamp", timestamp)
.setHeader("X-Auth-Version", version)
.setHeader("Content-Type", contentType)
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() != 200)
{
throw new BadResponseException(response.statusCode());
}
String serverSignature = response.headers().map().get("x-server-auth-signature").get(0);
String responseContentType = response.headers().map().get("Content-Type").get(0);
String stringToSign = nonce + timestamp + responseContentType + response.body();
mac.init(secretKey);
byte[] rawHmacServerCheck = mac.doFinal(stringToSign.getBytes());
String newSignature = new String(Hex.encodeHex(rawHmacServerCheck));
if (!newSignature.equals(serverSignature))
{
throw new SignatureMismatchException();
}
return response.body();
}
catch (SignatureMismatchException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: " + e.getMessage() + " Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (BadResponseException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: " + e.getMessage() + " Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (ConnectException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: Server failed to connect. Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
}
/**
* Send an API call to a public endpoint on Bitstamp's API.
*
* @param endPoint the endpoint to call
* @param params the parameters to send with the request
* @return the API endpoint response
*/
public String sendPrivateRequest(String endPoint, String[] params)
{
// Check API Key and API Key Secret are present
if (this.apiKey == null || this.apiKeySecret == null)
{
throw new RuntimeException(new APIKeyMissingException());
}
String apiKey = String.format("%s %s", "BITSTAMP", this.apiKey);
String apiKeySecret = this.apiKeySecret;
String httpVerb = "POST";
String urlHost = "www.bitstamp.net";
String urlPath = endPoint;
String urlQuery = "";
String timestamp = String.valueOf(System.currentTimeMillis());
String nonce = UUID.randomUUID().toString();
String contentType = "application/x-www-form-urlencoded";
String version = "v2";
String payloadString = "offset=1";
for (String param : params)
{
payloadString += "&" + param;
}
String signature = apiKey + httpVerb + urlHost + urlPath + urlQuery + contentType + nonce + timestamp + version + payloadString;
int i = 0;
while (true)
{
try
{
SecretKeySpec secretKey = new SecretKeySpec(apiKeySecret.getBytes(), "HmacSHA256");
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(secretKey);
byte[] rawHmac = mac.doFinal(signature.getBytes());
signature = new String(Hex.encodeHex(rawHmac)).toUpperCase();
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://" + urlHost + urlPath))
.POST(HttpRequest.BodyPublishers.ofString(payloadString))
.setHeader("X-Auth", apiKey)
.setHeader("X-Auth-Signature", signature)
.setHeader("X-Auth-Nonce", nonce)
.setHeader("X-Auth-Timestamp", timestamp)
.setHeader("X-Auth-Version", version)
.setHeader("Content-Type", contentType)
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() != 200)
{
throw new BadResponseException(response.statusCode());
}
String serverSignature = response.headers().map().get("x-server-auth-signature").get(0);
String responseContentType = response.headers().map().get("Content-Type").get(0);
String stringToSign = nonce + timestamp + responseContentType + response.body();
mac.init(secretKey);
byte[] rawHmacServerCheck = mac.doFinal(stringToSign.getBytes());
String newSignature = new String(Hex.encodeHex(rawHmacServerCheck));
if (!newSignature.equals(serverSignature))
{
throw new SignatureMismatchException();
}
return response.body();
}
catch (SignatureMismatchException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: " + e.getMessage() + " Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (BadResponseException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: " + e.getMessage() + " Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (ConnectException e)
{
if (i++ < MAX_RETRY)
{
System.out.println("[API Connection]: Server failed to connect. Retrying...");
continue;
}
throw new RuntimeException(e);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
}
}