3

我正在尝试在我的 Xamarin.iOS 和 Xamarin.Android 应用程序中使用FFImageLoading从 url 加载图像。所有网址都需要身份验证..

我也modernhttpclient用于所有其他休息电话。因为modernhttpclient这就是我添加身份验证的方式

var cookieHandler = new NativeCookieHandler ();
var messageHandler = new NativeMessageHandler (false, false, cookieHandler);
cookieHandler.SetCookies (RestApiPaths.cookies);
using (var client = new HttpClient (messageHandler)) {
client.DefaultRequestHeaders.TryAddWithoutValidation ("User-Agent", GetUserAgent (platform));
var r = await client.GetAsync (new Uri (url));

它运行良好。我为 FFImageLoading 做了同样的事情，

var cookieHandler = new NativeCookieHandler ();
var messageHandler = new NativeMessageHandler (false, false, cookieHandler);
cookieHandler.SetCookies (RestApiPaths.cookies);
var client = new HttpClient (messageHandler);
client.DefaultRequestHeaders.TryAddWithoutValidation ("User-Agent", RestApiPaths.GetUserAgent (Constants.__IOS__));

ImageService.Instance.Initialize (new Configuration {
    HttpClient = client
});

ImageService.Instance.LoadUrl (url).Into (ArticleImageView);

但不幸的是，它不起作用。没有图像被加载。我知道这是身份验证的问题。我尝试使用另一个不需要身份验证及其工作的 url。有人可以告诉我应该怎么做才能让它工作。

编辑：

我从身份验证支持尝试了这个

public class AuthenticatedHttpImageClientHandler : HttpClientHandler
{

    public AuthenticatedHttpImageClientHandler()
    {

    }

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        request.Headers.Add("Cookie", RestApiPaths.cookie);
        request.Headers.Add("User-Agent", RestApiPaths.GetUserAgent(Constants.__IOS__));
        return await base.SendAsync(request, cancellationToken).ConfigureAwait(false);
    }
}

然后：

ImageService.Instance.Initialize (new Configuration {
    HttpClient = new HttpClient(new AuthenticatedHttpImageClientHandler())
});

但仍然无法正常工作..

4

1 回答 1

4

我是这样做的

ImageService.Instance.Initialize(new Configuration {
    HttpClient = NetworkHelper.GetAuthenticatedHttpClient(Constants.__IOS__)
});
ImageService.Instance.LoadUrl(url).Into(imageView);

在我的情况下，NetworkHelper.GetAuthenticatedHttpClient 返回带有所需标头和身份验证令牌的 HttpClient。

public static HttpClient GetAuthenticatedHttpClient(int platform)
{
     HttpClient client = new HttpClient(messageHandler);
     client.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", GetUserAgent(platform));
     client.DefaultRequestHeaders.TryAddWithoutValidation("X-Time-Zone", timezone);
     client.DefaultRequestHeaders.TryAddWithoutValidation("appVersion", CommonHelper.AppVersion);
     client.DefaultRequestHeaders.TryAddWithoutValidation("X-Auth", GetAuthToken());
     return client;
}

你只需要做Instance.Initialize一次

于 2018-07-01T15:16:46.053 回答