如何使用 ConfigurePrimaryHttpMessageHandler 泛型 [英] How to use ConfigurePrimaryHttpMessageHandler generic

问题描述

我想为 Typed HttpClient 添加一个 HttClientHandler 以包含证书身份验证.

I want to add an HttClientHandler for a Typed HttpClient in order to include certificate authentication.

我在网上找到的所有例子都是这样的:

All the examples I'm finding on the internet are like this:

services.AddHttpClient<IMyService, MyService>()
    .ConfigurePrimaryHttpMessageHandler(() =>
    {
        return new HttpClientHandler()
        {
            // Set here whatever you need to get configured
        };
    });

但我不想在这里包含获取证书的所有逻辑，所以我想使用ConfigurePrimaryHttpMessageHandler<>的通用版本并编写自己的消息处理程序来包含证书在请求中.

But I don't want to include all the logic to obtain the certificate here, so I would like to use the generic version of ConfigurePrimaryHttpMessageHandler<> and write my own message handler to include the certificate in the request.

问题是我很难理解我应该如何实现消息处理程序...我应该从 HttpClientHandler 继承吗??

The problem is that I'm struggling to understand how should I implement the message handler... should I inherit from HttpClientHandler ??

请帮忙！

更新

正如我最初怀疑的那样，@Nkosi 也证实了，在这种情况下，从 HttpClient 处理程序派生是可行的方法.最后的代码类似于:

As I initially suspected, and @Nkosi confirmed, to derive from HttpClient handler is the way to go in this scenario. The code in the ends looks similar to this:

public class MyHttpClientHandler : HttpClientHandler
{
    private readonly IMyConfiguration _myConfiguration;

    public MyHttpClientHandler(IMyConfiguration myConfiguration)
    {
        _myConfiguration = myConfiguration;

        using (var certStore = new X509Store(StoreName.My, StoreLocation.LocalMachine))
        {
            certStore.Open(OpenFlags.ReadOnly);
            var certCollection = certStore.Certificates.Find(
                X509FindType.FindBySerialNumber,
                _myConfiguration.MyCertificateSerial,
                true);

            X509Certificate2 certificate = certCollection[0];    
            ClientCertificateOptions = ClientCertificateOption.Manual;
            SslProtocols = System.Security.Authentication.SslProtocols.Tls12;
            ClientCertificates.Add(certificate);
        }
    }
}

非常重要！

另一方面，在尝试注册我的 http 客户端处理程序时，我注意到它从未被调用过.经过一番谷歌搜索后，我发现目前有一个关于该问题的公开错误 (https://github.com/aspnet/Extensions/issues/851).因此，在修复之前，您需要以这种方式配置处理程序:

On the other hand while trying to register my http client handler I noticed it was never being called. After some googling I found out that currently there's an open bug about that (https://github.com/aspnet/Extensions/issues/851). So until it get's fixed you need configure your handler this way:

services.AddTransient<MyHttpClientHandler>();

services.AddHttpClient<IMyService, MyService>()
    .ConfigurePrimaryHttpMessageHandler(sp => sp.GetRequiredService<MyHttpClientHandler>());

推荐答案

派生自 HttpClientHandler 或任何 HttpMessageHandler 派生类.

Derive from HttpClientHandler or any HttpMessageHandler derived class.

public class MyHttpClientHandler : HttpClientHandler {

    public MyHttpClientHandler() {
        //Set here whatever you need to get configured
    }

    //...override members as needed
}

使用适当的扩展名调用您的处理程序

Call your handler using appropriate extension

services
    .AddHttpClient<IMyService, MyService>()
    .ConfigurePrimaryHttpMessageHandler<MyHttpClientHandler>();

MyHttpClientHandler 将从共享正在构造的处理程序的生命周期的范围服务提供者解析.

The MyHttpClientHandler will be resolved from a scoped service provider that shares the lifetime of the handler being constructed.

这篇关于如何使用 ConfigurePrimaryHttpMessageHandler 泛型的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！