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This content applies to WaaS 1.0 only. We highly recommend that you upgrade to WaaS 2.0.

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Overview

This guide introduces Cobo WaaS API in Java SDK, enabling developers to integrate with Cobo’s Custodial/MPC services seamlessly using the Java programming language.

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Before You Begin

  • Ensure that you have created an account and configured Cobo’s Custodial/MPC services. For detailed instructions, please refer to the Quickstart guide.
  • To access the API documentation, navigate to the API references section.

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Using the Cobo Java SDK

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GitHub

The Official Java SDK for Cobo WaaS API.

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Requirements

  • JDK8
  • JDK17 or newer

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Installation

Step 1. Add the JitPack repository to your build file gradle: 
allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}
maven: 
<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>
Step 2. Add the dependency gradle: 
dependencies {
    implementation 'com.github.CoboGlobal:cobo-java-api:v0.64'
}
maven: 
<dependency>
    <groupId>com.github.CoboGlobal</groupId>
    <artifactId>cobo-java-api</artifactId>
    <version>v0.62</version>
</dependency>

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Code Sample

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Generate Key Pair

import com.cobo.custody.api.client.impl.LocalSigner;

String[] key = LocalSigner.generateKeyPair();
String secretKey = key[0];
String apiKey = key[1];
For more information on the API key, please click here.

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Initialize ApiSigner

ApiSigner can be instantiated through new LocalSigner("secretkey" ) In certain scenarios, the private key may be restricted from export, such as when it is stored in AWS Key Management Service (KMS). In such cases, please pass in a custom implementation using the ApiSigner interface: 

import com.cobo.custody.api.client.ApiSigner;
new ApiSigner() {
    @Override
    public String sign(byte[] message) {
        return null;
    }

    @Override
    public String getPublicKey() {
        return null;
    }
}

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Initialize RestClient

These can be instantiated using the corresponding factory method provided by CoboApiClientFactory. 
import com.cobo.custody.api.client.CoboApiClientFactory;
import com.cobo.custody.api.client.CoboApiRestClient;
import com.cobo.custody.api.client.config.CoboApiConfig;
import com.cobo.custody.api.client.config.Env;
import com.cobo.custody.api.client.impl.LocalSigner;

CoboApiRestClient client = CoboApiClientFactory.newInstance(
                new LocalSigner(apiSecret),
                Env.DEV,
                false).newRestClient();

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Custodial Wallet Sample


import com.cobo.custody.api.client.CoboApiClientFactory;
import com.cobo.custody.api.client.CoboApiRestClient;
import com.cobo.custody.api.client.config.Env;
import com.cobo.custody.api.client.domain.ApiResponse;
import com.cobo.custody.api.client.domain.account.CoinInfo;
import com.cobo.custody.api.client.impl.LocalSigner;

String[] key = LocalSigner.generateKeyPair();
String secretKey = key[0];
String apiKey = key[1];

CoboApiRestClient client = CoboApiClientFactory.newInstance(
        new LocalSigner(secretKey),
        Env.DEV,
        false).newRestClient();

ApiResponse<CoinInfo> coinInfo = client.getCoinInfo("BTC");
System.out.println(coinInfo);

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MPC Wallet Sample

import com.cobo.custody.api.client.CoboApiClientFactory;
import com.cobo.custody.api.client.CoboMPCApiRestClient;
import com.cobo.custody.api.client.config.Env;
import com.cobo.custody.api.client.domain.ApiResponse;
import com.cobo.custody.api.client.domain.account.MPCChains;
import com.cobo.custody.api.client.impl.LocalSigner;

String[] key = LocalSigner.generateKeyPair();
String secretKey = key[0];
String apiKey = key[1];

CoboMPCApiRestClient mpc_client = CoboApiClientFactory.newInstance(
        new LocalSigner(secretKey),
        Env.DEV,
        false).newMPCRestClient();

ApiResponse<MPCChains> chains = mpc_client.getSupportedChains();
System.out.println(chains);

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Handling Response

import com.cobo.custody.api.client.CoboApiClientFactory;
import com.cobo.custody.api.client.CoboMPCApiRestClient;
import com.cobo.custody.api.client.config.Env;
import com.cobo.custody.api.client.domain.ApiResponse;
import com.cobo.custody.api.client.domain.account.MPCChains;
import com.cobo.custody.api.client.impl.LocalSigner;

CoboApiRestClient client = CoboApiClientFactory.newInstance(
        new LocalSigner(secretKey),
        Env.DEV,
        false).newRestClient();

ApiResponse<CoinInfo> coinInfo = client.getCoinInfo("BTC");
System.out.println(coinInfo);

/* The response like this
"Response{success=true,
          errorCode=0, errorMessage='null',
          errorId='null', errorDescription='null',
          result=CoinInfo{
              coin='BTC', displayCode='BTC',
              description='Bitcoin', decimal=8, canDeposit=true,
              canWithdraw=true, requireMemo=false,
              minimumDepositThreshold='10000',
              balance='10000', absBalance='0.0001',
              feeCoin='BTC', absEstimateFee='0.000948',
              confirmingThreshold=4, dustThreshold=546',
              tokenAddress='',
              absEstimateFeeUsd='35.28'
           }
         }"
*/

 // You can handle the response object as follows:
System.out.println(coinInfo.isSuccess());
System.out.println(coinInfo.getResult().getCoin());
System.out.println(coinInfo.getResult().getBalance());

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Handling API Errors

/* The error response like this
Response{ success=false, errorCode=1006,
          errorMessage='Invalid api key, please use standard wallet api key',
          errorId='fbee1201d4ee4a67aae91f05f57e0679',
          errorDescription='Invalid api key, please use standard wallet api key',
          result=null
         }
*/

// You can handle the response object as follows:
System.out.println(coinInfo.isSuccess());
System.out.println(coinInfo.getErrorCode());
System.out.println(coinInfo.getErrorDescription());
System.out.println(coinInfo.getErrorId());
System.out.println(coinInfo.getErrorMessage());
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