Preparation fo Mystery rolling

ALttPRandomizer/Serialization/YamlInputFormatter.cs

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+namespace ALttPRandomizer.Serialization {
+    using System;
+    using System.Text;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Mvc.Formatters;
+    using Microsoft.Extensions.Logging;
+    using Microsoft.Net.Http.Headers;
+    using YamlDotNet.Serialization;
+
+    public class YamlInputFormatter : TextInputFormatter {
+        private IDeserializer Deserializer { get; }
+        private ILogger<YamlInputFormatter> Logger { get; }
+
+        public YamlInputFormatter(IDeserializer deserializer, ILogger<YamlInputFormatter> logger) {
+            this.Deserializer = deserializer;
+            this.Logger = logger;
+
+            this.SupportedEncodings.Add(Encoding.UTF8);
+            this.SupportedEncodings.Add(Encoding.Unicode);
+            this.SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("application/yaml"));
+            this.SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("text/yaml"));
+        }
+
+        public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context, Encoding encoding) {
+            var request = context.HttpContext.Request;
+
+            using var reader = context.ReaderFactory(request.Body, encoding);
+            var type = context.ModelType;
+
+            try {
+                var content = await reader.ReadToEndAsync();
+                var model = this.Deserializer.Deserialize(content, type);
+                return await InputFormatterResult.SuccessAsync(model);
+            } catch (Exception ex) {
+                this.Logger.LogInformation(ex, "Error parsing YAML");
+                return await InputFormatterResult.FailureAsync();
+            }
+        }
+    }
+}