Added endpoint to get max borrowable

Author: truonghatsts

src/main/java/com/binance/api/client/BinanceApiMarginRestClient.java

@@ -88,10 +88,17 @@ public interface BinanceApiMarginRestClient {
     /**
      * Query loan record
      * @param asset asset to query
-     * @return loan records
+     * @return repay records
      */
     RepayQueryResult queryRepay(String asset, long startTime);
 
+    /**
+     * Query max borrowable
+     * @param asset asset to query
+     * @return max borrowable
+     */
+    MaxBorrowableQueryResult queryMaxBorrowable(String asset);
+
     /**
      * Query loan record
      * @param asset asset to query

src/main/java/com/binance/api/client/domain/account/MaxBorrowableQueryResult.java

@@ -0,0 +1,31 @@
+package com.binance.api.client.domain.account;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import java.util.List;
+
+/**
+ * Max Borrow Query Result
+ *
+ * @see Withdraw
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class MaxBorrowableQueryResult {
+
+  private String amount;
+
+  public String getAmount() {
+    return amount;
+  }
+
+  public void setAmount(String amount) {
+    this.amount = amount;
+  }
+
+  @Override
+  public String toString() {
+    return "MaxBorrowQueryResult{" +
+            "amount='" + amount + '\'' +
+            '}';
+  }
+}

src/main/java/com/binance/api/client/impl/BinanceApiMarginRestClientImpl.java

@@ -105,6 +105,12 @@ public RepayQueryResult queryRepay(String asset, long startTime) {
     return executeSync(binanceApiService.queryRepay(asset, startTime, timestamp));
   }
 
+  @Override
+  public MaxBorrowableQueryResult queryMaxBorrowable(String asset) {
+    long timestamp = System.currentTimeMillis();
+    return executeSync(binanceApiService.queryMaxBorrowable(asset, timestamp));
+  }
+
   @Override
   public MarginTransaction repay(String asset, String amount) {
     long timestamp = System.currentTimeMillis();

src/main/java/com/binance/api/client/impl/BinanceApiService.java

@@ -186,6 +186,10 @@ Call<WithdrawResult> withdraw(@Query("asset") String asset, @Query("address") St
   @GET("/sapi/v1/margin/repay")
   Call<RepayQueryResult> queryRepay(@Query("asset") String asset, @Query("txId") String txId, @Query("timestamp") Long timestamp);
 
+  @Headers({BinanceApiConstants.ENDPOINT_SECURITY_TYPE_APIKEY_HEADER, BinanceApiConstants.ENDPOINT_SECURITY_TYPE_SIGNED_HEADER})
+  @GET("/sapi/v1/margin/maxBorrowable")
+  Call<MaxBorrowableQueryResult> queryMaxBorrowable(@Query("asset") String asset, @Query("timestamp") Long timestamp);
+
   @Headers({BinanceApiConstants.ENDPOINT_SECURITY_TYPE_APIKEY_HEADER, BinanceApiConstants.ENDPOINT_SECURITY_TYPE_SIGNED_HEADER})
   @GET("/sapi/v1/margin/repay")
   Call<RepayQueryResult> queryRepay(@Query("asset") String asset, @Query("startTime") Long starttime, @Query("timestamp") Long timestamp);

src/test/java/com/binance/api/examples/MarginAccountEndpointsLoanQueryExample.java

@@ -3,6 +3,7 @@
 import com.binance.api.client.BinanceApiClientFactory;
 import com.binance.api.client.BinanceApiMarginRestClient;
 import com.binance.api.client.domain.account.MarginTransaction;
+import com.binance.api.client.domain.account.MaxBorrowableQueryResult;
 import com.binance.api.client.domain.account.RepayQueryResult;
 
 /**
@@ -13,6 +14,10 @@ public class MarginAccountEndpointsLoanQueryExample {
     public static void main(String[] args) {
         BinanceApiClientFactory factory = BinanceApiClientFactory.newInstance("YOUR_API_KEY", "YOUR_SECRET");
         BinanceApiMarginRestClient client = factory.newMarginRestClient();
+        MaxBorrowableQueryResult usdt = client.queryMaxBorrowable("USDT");
+        System.out.println(usdt.getAmount());
+        MaxBorrowableQueryResult bnb = client.queryMaxBorrowable("BNB");
+        System.out.println(bnb.getAmount());
         MarginTransaction borrowed = client.borrow("USDT", "310");
         System.out.println(borrowed.getTranId());
         MarginTransaction repaid = client.repay("USDT", "310");