Shared exchange functionality (#214)

CryptoExchange.Net/SharedApis/Models/Options/Endpoints/GetTradeHistoryOptions.cs

@@ -0,0 +1,42 @@
+using CryptoExchange.Net.Objects;
+using System;
+using System.Text;
+
+namespace CryptoExchange.Net.SharedApis
+{
+    /// <summary>
+    /// Options for requesting trade history
+    /// </summary>
+    public class GetTradeHistoryOptions : PaginatedEndpointOptions<GetTradeHistoryRequest>
+    {
+        /// <summary>
+        /// The max age of data that can be requested
+        /// </summary>
+        public TimeSpan? MaxAge { get; set; }
+
+        /// <summary>
+        /// ctor
+        /// </summary>
+        public GetTradeHistoryOptions(SharedPaginationSupport paginationType, bool needsAuthentication) : base(paginationType, needsAuthentication)
+        {
+        }
+
+        /// <inheritdoc />
+        public override Error? ValidateRequest(string exchange, GetTradeHistoryRequest request, TradingMode? tradingMode, TradingMode[] supportedApiTypes)
+        {
+            if (MaxAge.HasValue && request.StartTime < DateTime.UtcNow.Add(-MaxAge.Value))
+                return new ArgumentError($"Only the most recent {MaxAge} trades are available");
+
+            return base.ValidateRequest(exchange, request, tradingMode, supportedApiTypes);
+        }
+
+        /// <inheritdoc />
+        public override string ToString(string exchange)
+        {
+            var sb = new StringBuilder(base.ToString(exchange));
+            if (MaxAge != null)
+                sb.AppendLine($"Max age of data: {MaxAge}");
+            return sb.ToString();
+        }
+    }
+}