Switch to non obsolete API

Author: HaoK

src/Identity/ApiAuthorization.IdentityServer/src/Extensions/DefaultClientRequestParametersProvider.cs

@@ -2,7 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Linq;
-using Duende.IdentityServer.Extensions;
+using Duende.IdentityServer.Services;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Options;
 
@@ -12,7 +12,8 @@ internal class DefaultClientRequestParametersProvider : IClientRequestParameters
 {
     public DefaultClientRequestParametersProvider(
         IAbsoluteUrlFactory urlFactory,
-        IOptions<ApiAuthorizationOptions> options)
+        IOptions<ApiAuthorizationOptions> options,
+        IIssuerNameService nameService)
     {
         UrlFactory = urlFactory;
         Options = options;
@@ -22,10 +23,12 @@ public DefaultClientRequestParametersProvider(
 
     public IOptions<ApiAuthorizationOptions> Options { get; }
 
+    public IIssuerNameService NameService { get; }
+
     public IDictionary<string, string> GetClientParameters(HttpContext context, string clientId)
     {
         var client = Options.Value.Clients[clientId];
-        var authority = context.GetIdentityServerIssuerUri();
+        var authority = NameService.GetCurrentAsync().GetAwaiter().GetResult();
         if (!client.Properties.TryGetValue(ApplicationProfilesPropertyNames.Profile, out var type))
         {
             throw new InvalidOperationException($"Can't determine the type for the client '{clientId}'");