Add default value for TokenAudience and JwtExpiresAfter (#7)

Author: trejjam

src/Apple.AppStoreConnect/AppleAuthenticationPostConfigure.cs

@@ -1,12 +1,19 @@
 using Microsoft.Extensions.Options;
 using Microsoft.IdentityModel.JsonWebTokens;
+using System;
 
 namespace Apple.AppStoreConnect;
 
 public sealed class AppleAuthenticationPostConfigure : IPostConfigureOptions<AppleAuthenticationOptions>
 {
     public void PostConfigure(string? name, AppleAuthenticationOptions options)
     {
+        // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+        if (options.TokenAudience is null)
+        {
+            options.TokenAudience = "appstoreconnect-v1";
+        }
+
         // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
         if (options.SecurityTokenHandler is null)
         {
@@ -15,5 +22,11 @@ public void PostConfigure(string? name, AppleAuthenticationOptions options)
                 SetDefaultTimesOnTokenCreation = false,
             };
         }
+
+        // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+        if (options.JwtExpiresAfter == TimeSpan.Zero)
+        {
+            options.JwtExpiresAfter = TimeSpan.FromMinutes(20);
+        }
     }
 }