5 files changed, 95 insertions, 0 deletions
diff --git a/MediaBrowser.Common/IApplicationHost.cs b/MediaBrowser.Common/IApplicationHost.cs
index 7a76be7223..849037ac46 100644
--- a/MediaBrowser.Common/IApplicationHost.cs
+++ b/MediaBrowser.Common/IApplicationHost.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Reflection;
 using System.Threading.Tasks;
 using MediaBrowser.Common.Plugins;
 using Microsoft.Extensions.DependencyInjection;
@@ -77,6 +78,12 @@ namespace MediaBrowser.Common
         IReadOnlyList<IPlugin> Plugins { get; }
 
         /// <summary>
+        /// Gets all plugin assemblies which implement a custom rest api.
+        /// </summary>
+        /// <returns>An <see cref="IEnumerable{Assembly}"/> containing the plugin assemblies.</returns>
+        IEnumerable<Assembly> GetApiPluginAssemblies();
+
+        /// <summary>
         /// Notifies the pending restart.
         /// </summary>
         void NotifyPendingRestart();
diff --git a/MediaBrowser.Common/Json/Converters/JsonNullableStructConverter.cs b/MediaBrowser.Common/Json/Converters/JsonNullableStructConverter.cs
new file mode 100644
index 0000000000..cffc41ba34
--- /dev/null
+++ b/MediaBrowser.Common/Json/Converters/JsonNullableStructConverter.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace MediaBrowser.Common.Json.Converters
+{
+    /// <summary>
+    /// Converts a nullable struct or value to/from JSON.
+    /// Required - some clients send an empty string.
+    /// </summary>
+    /// <typeparam name="T">The struct type.</typeparam>
+    public class JsonNullableStructConverter<T> : JsonConverter<T?>
+        where T : struct
+    {
+        private readonly JsonConverter<T?> _baseJsonConverter;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="JsonNullableStructConverter{T}"/> class.
+        /// </summary>
+        /// <param name="baseJsonConverter">The base json converter.</param>
+        public JsonNullableStructConverter(JsonConverter<T?> baseJsonConverter)
+        {
+            _baseJsonConverter = baseJsonConverter;
+        }
+
+        /// <inheritdoc />
+        public override T? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            // Handle empty string.
+            if (reader.TokenType == JsonTokenType.String && ((reader.HasValueSequence && reader.ValueSequence.IsEmpty) || reader.ValueSpan.IsEmpty))
+            {
+                return null;
+            }
+
+            return _baseJsonConverter.Read(ref reader, typeToConvert, options);
+        }
+
+        /// <inheritdoc />
+        public override void Write(Utf8JsonWriter writer, T? value, JsonSerializerOptions options)
+        {
+            _baseJsonConverter.Write(writer, value, options);
+        }
+    }
+}
diff --git a/MediaBrowser.Common/Json/JsonDefaults.cs b/MediaBrowser.Common/Json/JsonDefaults.cs
index 9d30927dbb..5867cd4a0c 100644
--- a/MediaBrowser.Common/Json/JsonDefaults.cs
+++ b/MediaBrowser.Common/Json/JsonDefaults.cs
@@ -29,8 +29,14 @@ namespace MediaBrowser.Common.Json
                 NumberHandling = JsonNumberHandling.AllowReadingFromString
             };
 
+            // Get built-in converters for fallback converting.
+            var baseNullableInt32Converter = (JsonConverter<int?>)options.GetConverter(typeof(int?));
+            var baseNullableInt64Converter = (JsonConverter<long?>)options.GetConverter(typeof(long?));
+
             options.Converters.Add(new JsonGuidConverter());
             options.Converters.Add(new JsonStringEnumConverter());
+            options.Converters.Add(new JsonNullableStructConverter<int>(baseNullableInt32Converter));
+            options.Converters.Add(new JsonNullableStructConverter<long>(baseNullableInt64Converter));
 
             return options;
         }
diff --git a/MediaBrowser.Common/Net/DefaultHttpClientHandler.cs b/MediaBrowser.Common/Net/DefaultHttpClientHandler.cs
new file mode 100644
index 0000000000..e189d6e706
--- /dev/null
+++ b/MediaBrowser.Common/Net/DefaultHttpClientHandler.cs
@@ -0,0 +1,20 @@
+using System.Net;
+using System.Net.Http;
+
+namespace MediaBrowser.Common.Net
+{
+    /// <summary>
+    /// Default http client handler.
+    /// </summary>
+    public class DefaultHttpClientHandler : HttpClientHandler
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DefaultHttpClientHandler"/> class.
+        /// </summary>
+        public DefaultHttpClientHandler()
+        {
+            // TODO change to DecompressionMethods.All with .NET5
+            AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
+        }
+    }
+}
diff --git a/MediaBrowser.Common/Net/NamedClient.cs b/MediaBrowser.Common/Net/NamedClient.cs
new file mode 100644
index 0000000000..0f6161c328
--- /dev/null
+++ b/MediaBrowser.Common/Net/NamedClient.cs
@@ -0,0 +1,18 @@
+namespace MediaBrowser.Common.Net
+{
+    /// <summary>
+    /// Registered http client names.
+    /// </summary>
+    public static class NamedClient
+    {
+        /// <summary>
+        /// Gets the value for the default named http client.
+        /// </summary>
+        public const string Default = nameof(Default);
+
+        /// <summary>
+        /// Gets the value for the MusicBrainz named http client.
+        /// </summary>
+        public const string MusicBrainz = nameof(MusicBrainz);
+    }
+}