Authentication update (#275)

Updated API credential logic, exchange implementation are expected to provide their own credentials implementation with ApiCredentials as base class
Removed ApiCredentials implementation used by most exchanges
Removed ApiCredentialsType Enum
Added CredentialSet base class and implementations for defining different API credentials
Added optional type param to AuthenticationProvider for the specific API credential type to improve type safety
Moved AuthenticationProvider/ApiCredentials from BaseApiClient to RestApiClient/SocketApiClient base classes
Added optional type params to RestApiClient/SocketApiClient base class to specify the AuthenticationProvider type and credentials type to improve type safety
Moved SetOptions/SetApiCredentials from BaseApiClient to RestApiClient/SocketApiClient
Extracted LibraryOptions<TRestOptions, TSocketOptions, TEnvironment> without TApiCredentials for libraries without API credentials
Removed ApiCredentials from ApiOptions, credentials can only be configured at library, rest or socket level
Added EnvironmentName to RestApiClient/SocketApiClient property
Added Unknown enum value to Shared interfaces SharedOrderStatus, SharedTransferStatus and SharedTriggerOrderStatus enums
Updated Enum converter to map value to an undefined Enum value instead of the first Enum value
Added support for checking for missing fields on RestIntegrationTest
Added BytesToHexString and HexToBytesString to ExchangeHelpers static class
Fixed bug where WebSocket connections are not reconnected when configuring Proxy with SetUpdates
Removed legacy CryptoBaseClient, CryptoRestClient and CryptoSocketClient

CryptoExchange.Net/Converters/SystemTextJson/EnumConverter.cs

@@ -88,6 +88,7 @@ namespace CryptoExchange.Net.Converters.SystemTextJson
 #endif
         private NullableEnumConverter? _nullableEnumConverter = null;
 
+        private static T? _undefinedEnumValue;
         private static ConcurrentBag<string> _unknownValuesWarned = new ConcurrentBag<string>();
 
         internal class NullableEnumConverter : JsonConverter<T?>
@@ -120,20 +121,32 @@ namespace CryptoExchange.Net.Converters.SystemTextJson
         public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
         {
             var t = ReadNullable(ref reader, typeToConvert, options, out var isEmptyString);
-            if (t == null)
-            {
-                if (isEmptyString && !_unknownValuesWarned.Contains(null))
-                {
-                    // We received an empty string and have no mapping for it, and the property isn't nullable
-                    LibraryHelpers.StaticLogger?.LogWarning($"Received null or empty enum value, but property type is not a nullable enum. EnumType: {typeof(T).FullName}. If you think {typeof(T).FullName} should be nullable please open an issue on the Github repo");
-                }
-
-                return new T(); // return default value
-            }
-            else
-            {
+            if (t != null)
                 return t.Value;
+            
+            if (isEmptyString && !_unknownValuesWarned.Contains(null))
+            {
+                // We received an empty string and have no mapping for it, and the property isn't nullable
+                LibraryHelpers.StaticLogger?.LogWarning($"Received null or empty enum value, but property type is not a nullable enum. EnumType: {typeof(T).FullName}. If you think {typeof(T).FullName} should be nullable please open an issue on the Github repo");
             }
+
+            return GetUndefinedEnumValue();
+        }
+
+        private T GetUndefinedEnumValue()
+        {
+            if (_undefinedEnumValue != null)
+                return _undefinedEnumValue.Value;
+
+            var type = typeof(T);
+            if (!Enum.IsDefined(type, -9))
+                _undefinedEnumValue = (T)Enum.ToObject(type, -9);
+            else if (!Enum.IsDefined(type, -99))
+                _undefinedEnumValue = (T)Enum.ToObject(type, -99);
+            else
+                _undefinedEnumValue = (T)Enum.ToObject(type, -999);
+
+            return (T)_undefinedEnumValue;
         }
 
         private T? ReadNullable(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options, out bool isEmptyString)

CryptoExchange.Net/Converters/SystemTextJson/SharedQuantityConverter.cs

@@ -13,7 +13,7 @@ namespace CryptoExchange.Net.Converters.SystemTextJson
         public override T? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
         {
             if (reader.TokenType != JsonTokenType.StartArray)
-                throw new Exception("");
+                throw new Exception("Invalid JSON structure");
 
             reader.Read(); // Start array
             var baseQuantity = reader.TokenType == JsonTokenType.Null ? (decimal?)null : reader.GetDecimal();
@@ -24,7 +24,7 @@ namespace CryptoExchange.Net.Converters.SystemTextJson
             reader.Read();
 
             if (reader.TokenType != JsonTokenType.EndArray)
-                throw new Exception("");
+                throw new Exception("Invalid JSON structure");
 
             reader.Read(); // End array
 

CryptoExchange.Net/Converters/SystemTextJson/SharedSymbolConverter.cs

@@ -10,7 +10,7 @@ namespace CryptoExchange.Net.Converters.SystemTextJson
         public override SharedSymbol? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
         {
             if (reader.TokenType != JsonTokenType.StartArray)
-                throw new Exception("");
+                throw new Exception("Invalid JSON structure");
 
             reader.Read(); // Start array
             var tradingMode = (TradingMode)Enum.Parse(typeof(TradingMode), reader.GetString()!);
@@ -24,7 +24,7 @@ namespace CryptoExchange.Net.Converters.SystemTextJson
             reader.Read();
 
             if (reader.TokenType != JsonTokenType.EndArray)
-                throw new Exception("");
+                throw new Exception("Invalid JSON structure");
 
             reader.Read(); // End array