与Facebook的身份验证移动服务在Azure中 [英] Authenticating with Facebook for Mobile Services in Azure

问题描述

我有天青移动服务Facebook验证的麻烦。

I am having trouble with facebook authentication for Mobile Services in Azure.

要更具体，我已经有一个使用的Facebook C＃SDK 一个应用程序，它工作正常。我可以登录，获取我的朋友等名单。我想用这个SDK保留，但我也想为Azure的移动服务进行身份验证。
所以，我的计划是，登录与Facebook C＃SDK（如我今天已经这样做），获得身份验证令牌，并将其传递给的 MobileServiceClient.LoginAsync（） - 功能。这样的话，我仍然可以在Facebook的C＃SDK所有不错的功能，并且还使用了内置的验证系统中的移动服务Azure上。

To be more specific, I already have an application that is using Facebook C# SDK and it works fine. I can log on, fetch list of my friends and so. I want to keep using this SDK, but I also want to authenticate for Azure Mobile Service. So, my plan was, log on with Facebook C# SDK (as I already do today), get the authentication token, and pass it to the MobileServiceClient.LoginAsync() - function. That way, I can still have all the nice features in Facebook C# SDK, and also use the built in authentication system in Mobile Services for Azure.

var client = new FacebookClient();

dynamic parameters = new ExpandoObject();
parameters.client_id = App.FacebookAppId;
parameters.redirect_uri = "https://www.facebook.com/connect/login_success.html";
parameters.response_type = "token";
parameters.display = "popup";

var loginUrl = client.GetLoginUrl(parameters);
WebView.Navigate(loginUrl);

当加载完成后，跟随着被执行：

When load is complete, followin is executed:

FacebookOAuthResult oauthResult;
if (client.TryParseOAuthCallbackUrl(e.Uri, out oauthResult) && oauthResult.IsSuccess)
{
    var accessToken = oauthResult.AccessToken;
    var json = JsonObject.Parse("{\"authenticationToken\" : \"" + accessToken + "\"}");
    var user = await App.MobileService.LoginAsync(MobileServiceAuthenticationProvider.Facebook, json);
}

不过，我当我打电话code以上的最后一行得到这个异​​常：
MobileServiceInvalidOperationException，错误：开机自检Facebook的登录请求必须指定在请求主体的访问令牌

However, I get this exception when I call the last line of code above: MobileServiceInvalidOperationException, "Error: The POST Facebook login request must specify the access token in the body of the request."

我无法找到如何格式化的accessToken任何信息，我已经尝试了很多不同的密钥（而不是authenticationToken为你我的样品中看到的）的。我也试图只是为了传递的accessToken字符串，但没有什么似乎工作。
另外，如果我使用MobileServiceClient.LoginAsync（）制作一个全新的登录，它工作得很好，但它似乎愚蠢强制用户登录两次。

I cannot find any information on how to format the accesstoken, I have tried a lot of different keys (instead of "authenticationToken" as you see in my sample). I also have tried just to pass the accesstoken string, but nothing seem to work. Also, if I use the MobileServiceClient.LoginAsync() for making a brand new login, it works just fine, but it seem silly to force users to log on twice.

任何帮助是极大AP preciated！

Any help is greatly appreciated!

推荐答案

预计为对象的格式为{的access_token ，最实际的访问令牌}。一旦登录使用Facebook的SDK完成，令牌返回与该名称的片段，所以这是在Azure移动服务所期待的。

The format expected for the object is {"access_token", "the-actual-access-token"}. Once the login is completed using the Facebook SDK, the token is returned in the fragment with that name, so that's what the Azure Mobile Service expects.

顺便说一句，这是一个code这是我写的，根据您的片断，其工作方式。它应该处理好失败的情况下，虽然，但令牌格式，这应该是足够的。

BTW, this is a code which I wrote, based on your snippet, which works. It should handle failed cases better, though, but for the token format, this should be enough

private void btnLoginFacebookToken_Click_1(object sender, RoutedEventArgs e)
{
    var client = new Facebook.FacebookClient();
    dynamic parameters = new ExpandoObject();
    parameters.client_id = "MY_APPLICATION_CLIENT_ID";
    parameters.redirect_uri = "https://www.facebook.com/connect/login_success.html";
    parameters.response_type = "token";
    parameters.display = "popup";
    var uri = client.GetLoginUrl(parameters);
    this.webView.LoadCompleted += webView_LoadCompleted;
    this.webView.Visibility = Windows.UI.Xaml.Visibility.Visible;
    this.webView.Navigate(uri);
}
async void webView_LoadCompleted(object sender, NavigationEventArgs e)
{
    AddToDebug("NavigationMode: {0}", e.NavigationMode);
    AddToDebug("Uri: {0}", e.Uri);
    string redirect_uri = "https://www.facebook.com/connect/login_success.html";
    bool close = (e.Uri.ToString().StartsWith(redirect_uri));
    if (close)
    {
        this.webView.LoadCompleted -= webView_LoadCompleted;
        this.webView.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
        string fragment = e.Uri.Fragment;
        string accessToken = fragment.Substring("#access_token=".Length);
        accessToken = accessToken.Substring(0, accessToken.IndexOf('&'));
        JsonObject token = new JsonObject();
        token.Add("access_token", JsonValue.CreateStringValue(accessToken));
        try
        {
            var user = await MobileService.LoginAsync(MobileServiceAuthenticationProvider.Facebook, token);
            AddToDebug("Logged in: {0}", user.UserId);
        }
        catch (Exception ex)
        {
            AddToDebug("Error: {0}", ex);
        }
    }
}

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