refactor(repeater): simplify FromDictionary method

src/SecTester.Repeater/Bus/IncomingRequest.cs

@@ -20,75 +20,49 @@ public record IncomingRequest(Uri Url) : IRequest
   private const string BodyKey = "body";
   private const string ProtocolKey = "protocol";
 
-  private static readonly Dictionary<string, Protocol> ProtocolEntries = typeof(Protocol)
-    .GetFields(BindingFlags.Public | BindingFlags.Static)
-    .Select(field => new
-    {
-      Value = (Protocol)field.GetValue(null),
-      StringValue = field.GetCustomAttribute<EnumMemberAttribute>()?.Value ?? field.Name
-    })
-    .ToDictionary(x => MessagePackNamingPolicy.SnakeCase.ConvertName(x.StringValue), x => x.Value);
-
-  [Key(ProtocolKey)]
-  public Protocol Protocol { get; set; } = Protocol.Http;
+  private static readonly Dictionary<string, Protocol> Protocols = typeof(Protocol)
+      .GetFields(BindingFlags.Public | BindingFlags.Static)
+      .Select(field => new
+      {
+        Value = (Protocol)field.GetValue(null),
+        StringValue = field.GetCustomAttribute<EnumMemberAttribute>()?.Value ?? field.Name
+      })
+      .ToDictionary(x => MessagePackNamingPolicy.SnakeCase.ConvertName(x.StringValue), x => x.Value);
 
-  private IEnumerable<KeyValuePair<string, IEnumerable<string>>> _headers = Enumerable.Empty<KeyValuePair<string, IEnumerable<string>>>();
+  [Key(ProtocolKey)] public Protocol Protocol { get; set; } = Protocol.Http;
 
-  [Key(HeadersKey)]
-  public IEnumerable<KeyValuePair<string, IEnumerable<string>>> Headers
-  {
-    get => _headers;
-    // ADHOC: convert from a kind of assignable type to formatter resolvable type
-    set => _headers = value.AsEnumerable();
-  }
+  [Key(HeadersKey)] public IEnumerable<KeyValuePair<string, IEnumerable<string>>> Headers { get; set; } = new Dictionary<string, IEnumerable<string>>();
 
-  [Key(BodyKey)]
-  public string? Body { get; set; }
+  [Key(BodyKey)] public string? Body { get; set; }
 
-  [Key(MethodKey)]
-  public HttpMethod Method { get; set; } = HttpMethod.Get;
+  [Key(MethodKey)] public HttpMethod Method { get; set; } = HttpMethod.Get;
 
-  [Key(UrlKey)]
-  public Uri Url { get; set; } = Url ?? throw new ArgumentNullException(nameof(Url));
+  [Key(UrlKey)] public Uri Url { get; set; } = Url ?? throw new ArgumentNullException(nameof(Url));
 
   public static IncomingRequest FromDictionary(Dictionary<object, object> dictionary)
   {
-    var protocol = !dictionary.ContainsKey(ProtocolKey) || (dictionary.TryGetValue(ProtocolKey, out var p1) && p1 is null)
-      ? Protocol.Http
-      : dictionary.TryGetValue(ProtocolKey, out var p2) && p2 is string && ProtocolEntries.TryGetValue(p2.ToString(), out var e)
-        ? e
-        : throw new InvalidDataException(FormatPropertyError(ProtocolKey));
-
-    var uri = dictionary.TryGetValue(UrlKey, out var u) && u is string
-      ? new Uri(u.ToString())
-      : throw new InvalidDataException(FormatPropertyError(UrlKey));
-
-    var method = dictionary.TryGetValue(MethodKey, out var m) && m is string
-      ? new HttpMethod(m.ToString())
-      : HttpMethod.Get;
-
-    var body = dictionary.TryGetValue(BodyKey, out var b) && b is string ? b.ToString() : null;
-
-    var headers = dictionary.TryGetValue(HeadersKey, out var h) && h is Dictionary<object, object> value
-      ? MapHeaders(value)
-      : Enumerable.Empty<KeyValuePair<string, IEnumerable<string>>>();
-
-    return new IncomingRequest(uri)
+    var protocol = dictionary.TryGetValue(ProtocolKey, out var p2) ? p2.ToString() : Protocol.Http.ToString();
+    var uri = dictionary.TryGetValue(UrlKey, out var u) ? u.ToString() : throw PropertyError(UrlKey);
+    var method = dictionary.TryGetValue(MethodKey, out var m) ? m.ToString() : HttpMethod.Get.ToString();
+    var body = dictionary.TryGetValue(BodyKey, out var b) ? b.ToString() : null;
+    var headers = dictionary.TryGetValue(HeadersKey, out var h)
+        ? h as IDictionary<string, object>
+        : new Dictionary<string, object>();
+
+    return new IncomingRequest(new Uri(uri))
     {
-      Protocol = protocol,
+      Protocol = Protocols.TryGetValue(protocol, out var protocolValue) ? protocolValue : Protocol.Http,
+      Method = HttpMethods.Items.TryGetValue(method, out var methodValue) ? methodValue : HttpMethod.Get,
       Body = body,
-      Method = method,
-      Headers = headers
+      Headers = headers.Select(kvp => kvp.Value switch
+      {
+        IEnumerable<object> strings => new KeyValuePair<string, IEnumerable<string>>(kvp.Key.ToString(),
+                  strings.Select(x => x.ToString())),
+        null => new KeyValuePair<string, IEnumerable<string>>(kvp.Key.ToString(), Enumerable.Empty<string>()),
+        _ => new KeyValuePair<string, IEnumerable<string>>(kvp.Key.ToString(), new[] { kvp.Value.ToString() })
+      })
     };
   }
 
-  private static IEnumerable<KeyValuePair<string, IEnumerable<string>>> MapHeaders(Dictionary<object, object> headers) =>
-    headers.Select(kvp => kvp.Value switch
-    {
-      IEnumerable<object> strings => new KeyValuePair<string, IEnumerable<string>>(kvp.Key.ToString(), strings.Select(x => x.ToString())),
-      null => new KeyValuePair<string, IEnumerable<string>>(kvp.Key.ToString(), Enumerable.Empty<string>()),
-      _ => new KeyValuePair<string, IEnumerable<string>>(kvp.Key.ToString(), new[] { kvp.Value.ToString() })
-    });
-
-  private static string FormatPropertyError(string propName) => $"{propName} is either null or has an invalid data type or value";
+  private static InvalidDataException PropertyError(string propName) => new($"{propName} is either null or has an invalid data type or value");
 }

src/SecTester.Repeater/Internal/HttpMethods.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Reflection;
+
+namespace SecTester.Repeater.Internal;
+
+public class HttpMethods
+{
+  public static IDictionary<string, HttpMethod> Items { get; } = typeof(HttpMethod)
+      .GetProperties(BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly)
+      .Where(x => x.PropertyType.IsAssignableFrom(typeof(HttpMethod)))
+      .Select(x => x.GetValue(null))
+      .Cast<HttpMethod>()
+      .Concat(new List<HttpMethod>
+      {
+            new("PATCH"),
+            new("COPY"),
+            new("LINK"),
+            new("UNLINK"),
+            new("PURGE"),
+            new("LOCK"),
+            new("UNLOCK"),
+            new("PROPFIND"),
+            new("VIEW")
+      })
+      .Distinct()
+      .ToDictionary(x => x.Method, x => x, StringComparer.InvariantCultureIgnoreCase);
+}

src/SecTester.Repeater/Internal/MessagePackHttpMethodFormatter.cs

@@ -1,36 +1,11 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Net.Http;
-using System.Reflection;
 using MessagePack;
 using MessagePack.Formatters;
 
 namespace SecTester.Repeater.Internal;
 
 internal class MessagePackHttpMethodFormatter : IMessagePackFormatter<HttpMethod?>
 {
-  private static readonly IEnumerable<HttpMethod> BaseMethods = typeof(HttpMethod)
-    .GetProperties(BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly)
-    .Where(x => x.PropertyType.IsAssignableFrom(typeof(HttpMethod)))
-    .Select(x => x.GetValue(null))
-    .Cast<HttpMethod>();
-
-  private static readonly IEnumerable<HttpMethod> CustomMethods = new List<HttpMethod>
-  {
-    new("PATCH"),
-    new("COPY"),
-    new("LINK"),
-    new("UNLINK"),
-    new("PURGE"),
-    new("LOCK"),
-    new("UNLOCK"),
-    new("PROPFIND"),
-    new("VIEW")
-  };
-
-  private static readonly IDictionary<string, HttpMethod> Methods = BaseMethods.Concat(CustomMethods).Distinct()
-    .ToDictionary(x => x.Method, x => x, StringComparer.InvariantCultureIgnoreCase);
   public void Serialize(ref MessagePackWriter writer, HttpMethod? value, MessagePackSerializerOptions options)
   {
     if (null == value)
@@ -63,7 +38,7 @@ public void Serialize(ref MessagePackWriter writer, HttpMethod? value, MessagePa
   {
     var token = reader.ReadString();
 
-    if (token is null || !Methods.TryGetValue(token, out var method))
+    if (token is null || !HttpMethods.Items.TryGetValue(token, out var method))
     {
       throw new MessagePackSerializationException(
         $"Unexpected value {token} when parsing the {nameof(HttpMethod)}.");

src/SecTester.Repeater/SecTester.Repeater.csproj

@@ -17,7 +17,9 @@
 
   <ItemGroup>
     <Folder Include="Api"/>
+    <Folder Include="Bus" />
     <Folder Include="Extensions"/>
+    <Folder Include="Internal"/>
     <Folder Include="Runners"/>
   </ItemGroup>