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TorchRemote.Plugin/Utils/JsonDataAttribute.cs

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+using System.Text.Json;
+using EmbedIO;
+using EmbedIO.WebApi;
+namespace TorchRemote.Plugin.Utils;
+
+/// <summary>
+/// <para>Specifies that a parameter of a controller method will receive
+/// an object obtained by deserializing the request body as JSON.</para>
+/// <para>The received object will be <see langword="null"/>
+/// only if the deserialized object is <c>null</c>.</para>
+/// <para>If the request body is not valid JSON,
+/// or if it cannot be deserialized to the type of the parameter,
+/// a <c>400 Bad Request</c> response will be sent to the client.</para>
+/// <para>This class cannot be inherited.</para>
+/// </summary>
+/// <seealso cref="Attribute" />
+/// <seealso cref="IRequestDataAttribute{TController}" />
+[AttributeUsage(AttributeTargets.Parameter)]
+public class JsonDataAttribute : Attribute, IRequestDataAttribute<WebApiController>
+{
+    /// <inheritdoc />
+    public async Task<object?> GetRequestDataAsync(WebApiController controller, Type type, string parameterName)
+    {
+        try
+        {
+            using var stream = controller.HttpContext.OpenRequestStream();
+            return await JsonSerializer.DeserializeAsync(stream, type, Statics.SerializerOptions);
+        }
+        catch (JsonException)
+        {
+            throw HttpException.BadRequest($"Expected request body to be deserializable to {type.FullName}.");
+        }
+    }
+}