Added modify order to kucoin hf (#225)

Co-authored-by: Ignas Vienazindys <[email protected]>

Kucoin.Net/Clients/SpotApi/KucoinRestClientSpotApiProAccount.cs

@@ -81,6 +81,34 @@ public async Task<WebCallResult<KucoinNewOrder>> PlaceOrderAsync(
                 _baseClient.InvokeOrderPlaced(new OrderId { SourceObject = result.Data, Id = result.Data.Id });
             return result;
         }
+
+        /// <inheritdoc />
+        public async Task<WebCallResult<KucoinModifiedOrder>> ModifyOrderAsync(
+            string symbol,
+            string? orderId = null,
+            string? clientOrderId = null,
+            decimal? newQuantity = null,
+            decimal? newPrice = null,
+            CancellationToken ct = default)
+        {
+            if (!newQuantity.HasValue && !newPrice.HasValue)
+                throw new ArgumentException("Must choose order parameter to edit");
+
+            if ((orderId is not null && clientOrderId is not null) || (orderId is null && clientOrderId is null))
+                throw new ArgumentException("Must choose one order id");
+
+            var parameters = new ParameterCollection
+            {
+                { "symbol", symbol }
+            };
+            parameters.AddOptionalParameter("clientOid", clientOrderId);
+            parameters.AddOptionalParameter("orderId", orderId);
+            parameters.AddOptionalParameter("newPrice", newPrice);
+            parameters.AddOptionalParameter("newSize", newQuantity);
+
+            var request = _definitions.GetOrCreate(HttpMethod.Post, $"api/v1/hf/orders/alter", KucoinExchange.RateLimiter.SpotRest, 3, true);
+            return await _baseClient.SendAsync<KucoinModifiedOrder>(request, parameters, ct).ConfigureAwait(false);
+        }
 
         /// <inheritdoc />
         public async Task<WebCallResult<KucoinCanceledOrders>> CancelOrderAsync(string orderId, string symbol, CancellationToken ct = default)

Kucoin.Net/Interfaces/Clients/SpotApi/IKucoinRestClientSpotApiProAccount.cs

@@ -50,6 +50,25 @@ Task<WebCallResult<KucoinNewOrder>> PlaceOrderAsync(
             string? clientOrderId = null,
             SelfTradePrevention? selfTradePrevention = null,
             CancellationToken ct = default);
+
+        /// <summary>
+        /// Modify an order
+        /// <para><a href="https://www.kucoin.com/docs/rest/spot-trading/spot-hf-trade-pro-account/modify-hf-order" /></para>
+        /// </summary>
+        /// <param name="symbol">Trading pair, such as ETH-BTC</param>
+        /// <param name="orderId">The id of the order to modify</param>
+        /// <param name="clientOrderId">The client id of the order to modify</param>
+        /// <param name="newQuantity">New order quantity</param>
+        /// <param name="newPrice">New order price</param>
+        /// <param name="ct">Cancellation token</param>
+        /// <returns>The id of the modified order</returns>
+        Task<WebCallResult<KucoinModifiedOrder>> ModifyOrderAsync(
+            string symbol,
+            string? orderId = null,
+            string? clientOrderId = null,
+            decimal? newQuantity = null,
+            decimal? newPrice = null,
+            CancellationToken ct = default);
 
         /// <summary>
         /// Cancel an order

Kucoin.Net/Objects/Models/Spot/KucoinModifiedOrder.cs

@@ -0,0 +1,15 @@
+using Newtonsoft.Json;
+
+namespace Kucoin.Net.Objects.Models.Spot;
+
+/// <summary>
+/// New order id
+/// </summary>
+public class KucoinModifiedOrder
+{
+    /// <summary>
+    /// The id of the new order
+    /// </summary>
+    [JsonProperty("newOrderId")]
+    public string Id { get; set; } = string.Empty;
+}