future-public: add set leverage request

src/LaravelBitunixApi.php

@@ -4,9 +4,11 @@ namespace Msr\LaravelBitunixApi;
 
 use GuzzleHttp\Client;
 use Msr\LaravelBitunixApi\Requests\FutureKLineRequestContract;
+use Msr\LaravelBitunixApi\Requests\ChangeLeverageRequestContract;
+use Msr\LaravelBitunixApi\Requests\Header;
 use Psr\Http\Message\ResponseInterface;
 
-class LaravelBitunixApi implements FutureKLineRequestContract
+class LaravelBitunixApi implements FutureKLineRequestContract, ChangeLeverageRequestContract
 {
     private Client $publicFutureClient;
 
@@ -17,6 +19,17 @@ class LaravelBitunixApi implements FutureKLineRequestContract
         ]);
     }
 
+    protected function getPrivateFutureClient(array $queryParams = [], array $body = []): Client
+    {
+        $bodyString = json_encode($body);
+        $headers = Header::generateHeaders($queryParams, $bodyString);
+
+        return new Client([
+            'base_uri' => config('bitunix-api.future_base_uri').'/api/v1/futures/',
+            'headers' => $headers,
+        ]);
+    }
+
     public function getFutureKline(string $symbol, string $interval, int $limit = 100, ?int $startTime = null, ?int $endTime = null, string $type = 'LAST_PRICE'): ResponseInterface
     {
         $response = $this->publicFutureClient->get('kline', [
@@ -32,4 +45,19 @@ class LaravelBitunixApi implements FutureKLineRequestContract
 
         return $response;
     }
+
+    public function changeLeverage(string $symbol, string $marginCoin, int $leverage): ResponseInterface
+    {
+        $body = [
+            'symbol' => $symbol,
+            'marginCoin' => $marginCoin,
+            'leverage' => $leverage,
+        ];
+
+        $response = $this->getPrivateFutureClient([], $body)->post('account/change_leverage', [
+            'json' => $body,
+        ]);
+
+        return $response;
+    }
 }