first commit -push

RobotNet.IdentityServer/Helpers/AsyncEnumerableExtensions.cs

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+namespace RobotNet.IdentityServer.Helpers;
+
+public static class AsyncEnumerableExtensions
+{
+    public static Task<List<T>> ToListAsync<T>(this IAsyncEnumerable<T> source)
+    {
+        return source == null ? throw new ArgumentNullException(nameof(source)) : ExecuteAsync();
+
+        async Task<List<T>> ExecuteAsync()
+        {
+            var list = new List<T>();
+
+            await foreach (var element in source)
+            {
+                list.Add(element);
+            }
+
+            return list;
+        }
+    }
+}

RobotNet.IdentityServer/Helpers/FormValueRequiredAttribute.cs

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+using Microsoft.AspNetCore.Mvc.Abstractions;
+using Microsoft.AspNetCore.Mvc.ActionConstraints;
+
+namespace RobotNet.IdentityServer.Helpers;
+
+public sealed class FormValueRequiredAttribute(string name) : ActionMethodSelectorAttribute
+{
+    private readonly string _name = name;
+
+    public override bool IsValidForRequest(RouteContext context, ActionDescriptor action)
+    {
+        if (string.Equals(context.HttpContext.Request.Method, "GET", StringComparison.OrdinalIgnoreCase) ||
+            string.Equals(context.HttpContext.Request.Method, "HEAD", StringComparison.OrdinalIgnoreCase) ||
+            string.Equals(context.HttpContext.Request.Method, "DELETE", StringComparison.OrdinalIgnoreCase) ||
+            string.Equals(context.HttpContext.Request.Method, "TRACE", StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+
+        if (string.IsNullOrEmpty(context.HttpContext.Request.ContentType))
+        {
+            return false;
+        }
+
+        if (!context.HttpContext.Request.ContentType.StartsWith("application/x-www-form-urlencoded", StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+
+        return !string.IsNullOrEmpty(context.HttpContext.Request.Form[_name]);
+    }
+}