From 384a62dc0883549b328dc1f70d19358ae0aa593e Mon Sep 17 00:00:00 2001
From: crobibero <cody@robibe.ro>
Date: Fri, 21 Aug 2020 10:23:47 -0600
Subject: [PATCH] Add nullable int32, int64 json converters

---
 .../Converters/JsonNullableInt32Converter.cs  | 55 +++++++++++++++
 .../Converters/JsonNullableInt64Converter.cs  | 70 +++++++++++++++++++
 MediaBrowser.Common/Json/JsonDefaults.cs      |  2 +
 3 files changed, 127 insertions(+)
 create mode 100644 MediaBrowser.Common/Json/Converters/JsonNullableInt32Converter.cs
 create mode 100644 MediaBrowser.Common/Json/Converters/JsonNullableInt64Converter.cs

diff --git a/MediaBrowser.Common/Json/Converters/JsonNullableInt32Converter.cs b/MediaBrowser.Common/Json/Converters/JsonNullableInt32Converter.cs
new file mode 100644
index 0000000000..c4579d989d
--- /dev/null
+++ b/MediaBrowser.Common/Json/Converters/JsonNullableInt32Converter.cs
@@ -0,0 +1,55 @@
+using System;
+using System.Buffers;
+using System.Buffers.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace MediaBrowser.Common.Json.Converters
+{
+    /// <summary>
+    /// Converts a GUID object or value to/from JSON.
+    /// </summary>
+    public class JsonNullableInt32Converter : JsonConverter<int?>
+    {
+        /// <inheritdoc />
+        public override int? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (reader.TokenType == JsonTokenType.String)
+            {
+                ReadOnlySpan<byte> span = reader.HasValueSequence ? reader.ValueSequence.ToArray() : reader.ValueSpan;
+                if (Utf8Parser.TryParse(span, out int number, out int bytesConsumed) && span.Length == bytesConsumed)
+                {
+                    return number;
+                }
+
+                var stringValue = reader.GetString().AsSpan();
+
+                // value is null or empty, just return null.
+                if (stringValue.IsEmpty)
+                {
+                    return null;
+                }
+
+                if (int.TryParse(stringValue, out number))
+                {
+                    return number;
+                }
+            }
+
+            return reader.GetInt32();
+        }
+
+        /// <inheritdoc />
+        public override void Write(Utf8JsonWriter writer, int? value, JsonSerializerOptions options)
+        {
+            if (value is null)
+            {
+                writer.WriteNullValue();
+            }
+            else
+            {
+                writer.WriteNumberValue(value.Value);
+            }
+        }
+    }
+}
diff --git a/MediaBrowser.Common/Json/Converters/JsonNullableInt64Converter.cs b/MediaBrowser.Common/Json/Converters/JsonNullableInt64Converter.cs
new file mode 100644
index 0000000000..53e5f6e9df
--- /dev/null
+++ b/MediaBrowser.Common/Json/Converters/JsonNullableInt64Converter.cs
@@ -0,0 +1,70 @@
+using System;
+using System.Buffers;
+using System.Buffers.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace MediaBrowser.Common.Json.Converters
+{
+    /// <summary>
+    /// Parse JSON string as nullable long.
+    /// Javascript does not support 64-bit integers.
+    /// </summary>
+    public class JsonNullableInt64Converter : JsonConverter<long?>
+    {
+        /// <summary>
+        /// Read JSON string as int64.
+        /// </summary>
+        /// <param name="reader"><see cref="Utf8JsonReader"/>.</param>
+        /// <param name="type">Type.</param>
+        /// <param name="options">Options.</param>
+        /// <returns>Parsed value.</returns>
+        public override long? Read(ref Utf8JsonReader reader, Type type, JsonSerializerOptions options)
+        {
+            if (reader.TokenType == JsonTokenType.String)
+            {
+                // try to parse number directly from bytes
+                var span = reader.HasValueSequence ? reader.ValueSequence.ToArray() : reader.ValueSpan;
+                if (Utf8Parser.TryParse(span, out long number, out var bytesConsumed) && span.Length == bytesConsumed)
+                {
+                    return number;
+                }
+
+                var stringValue = reader.GetString().AsSpan();
+
+                // value is null or empty, just return null.
+                if (stringValue.IsEmpty)
+                {
+                    return null;
+                }
+
+                // try to parse from a string if the above failed, this covers cases with other escaped/UTF characters
+                if (long.TryParse(stringValue, out number))
+                {
+                    return number;
+                }
+            }
+
+            // fallback to default handling
+            return reader.GetInt64();
+        }
+
+        /// <summary>
+        /// Write long to JSON long.
+        /// </summary>
+        /// <param name="writer"><see cref="Utf8JsonWriter"/>.</param>
+        /// <param name="value">Value to write.</param>
+        /// <param name="options">Options.</param>
+        public override void Write(Utf8JsonWriter writer, long? value, JsonSerializerOptions options)
+        {
+            if (value is null)
+            {
+                writer.WriteNullValue();
+            }
+            else
+            {
+                writer.WriteNumberValue(value.Value);
+            }
+        }
+    }
+}
diff --git a/MediaBrowser.Common/Json/JsonDefaults.cs b/MediaBrowser.Common/Json/JsonDefaults.cs
index 36ab6d900a..0a661934e5 100644
--- a/MediaBrowser.Common/Json/JsonDefaults.cs
+++ b/MediaBrowser.Common/Json/JsonDefaults.cs
@@ -29,9 +29,11 @@ namespace MediaBrowser.Common.Json
 
             options.Converters.Add(new JsonGuidConverter());
             options.Converters.Add(new JsonInt32Converter());
+            options.Converters.Add(new JsonNullableInt32Converter());
             options.Converters.Add(new JsonStringEnumConverter());
             options.Converters.Add(new JsonNonStringKeyDictionaryConverterFactory());
             options.Converters.Add(new JsonInt64Converter());
+            options.Converters.Add(new JsonNullableInt64Converter());
             options.Converters.Add(new JsonDoubleConverter());
 
             return options;