C# - Xamarin.iOs - 添加随机数到 xamarin.auth 请求

Question

我找不到将随机数添加到我的 Xamarin.Auth 请求以连接到我的 okta 登录名的方法。我是 xamarin 和 nugets 包的新手，我不知道如何修改 1.3.0 版 OAuth2Authenticator 的实现。

我正在尝试将请求参数用作:

auth.RequestParameters.Add("nonce", Guid.NewGuid().ToString("N"));

但我一直在运行来自 okta 的 nonce 无效错误。

如果你们中有人知道如何修复它。

这里是完整的请求:

   //start login flow seting our openId flow
    public void StartFlow(string responseType, string scope)
    {

        //webViewLogin.Hidden = false;
        var auth = new OAuth2Authenticator(
            clientId: OAuthClientId,
            scope: scope,
            authorizeUrl: new Uri(oktaTenantUrl),
            redirectUrl: new Uri(OAuthRedirectUrl)
            );
        auth.RequestParameters.Add("nonce", Guid.NewGuid().ToString("N"));
        auth.Completed += (sender, eventArgs) =>
        {
            DismissViewController(true, null);
            if (eventArgs.IsAuthenticated)
            {
                    // Use eventArgs.Account to do wonderful things
                }
        };
        PresentViewController(auth.GetUI(), true, null);
    }

Answer 1

有一种更简单的方法可以实现这一点。这似乎是一个错误/没有很好记录的过程。这issue解释要做什么:

You could probably override OnCreatingInitialUrl: https://github.com/xamarin/Xamarin.Auth/blob/ad7f6d6453506ced0ab3af499a7492f13973e3a3/source/Xamarin.Auth.LinkSource/OAuth2Authenticator.cs#L322

The RequestParameters property doesn't look to be used from what I can see, or at least not in that version.

因此解决方案是创建另一个继承 OAuth2Authenticator 的类并覆盖 OnCreatingInitialUrl:

using System;
using System.Collections.Generic;
using Xamarin.Auth;

namespace Alerte.Health.App.Droid.Classes
{
    public class MyOAuth2Authenticator : OAuth2Authenticator
    {
        public MyOAuth2Authenticator(string clientId, string scope, Uri authorizeUrl, Uri redirectUrl, GetUsernameAsyncFunc getUsernameAsync = null, bool isUsingNativeUI = false) : base(clientId, scope, authorizeUrl, redirectUrl, getUsernameAsync, isUsingNativeUI)
        {
        }

        public MyOAuth2Authenticator(string clientId, string clientSecret, string scope, Uri authorizeUrl, Uri redirectUrl, Uri accessTokenUrl, GetUsernameAsyncFunc getUsernameAsync = null, bool isUsingNativeUI = false) : base(clientId, clientSecret, scope, authorizeUrl, redirectUrl, accessTokenUrl, getUsernameAsync, isUsingNativeUI)
        {
        }

        protected override void OnCreatingInitialUrl(IDictionary<string, string> query)
        {
            query.Add("nonce",Guid.NewGuid().ToString("N"));
        }
    }
}

然后用这个代替OAuth2Authenticator，继续正常流程:

var auth = new MyOAuth2Authenticator(
    clientId,
    scope,
    new Uri(authorizeUrl),
    new Uri(redirectUrl));

等等等等