如何打开然后自动关闭的OAuth页面在Chrome在Android？

Question

[我在Xamarin中这样做，但我怀疑答案并不重要，因为Xamarin公开的API或多或少与本机Java相同]

我正在尝试学习OAuth并实现授权流（没有隐式授权）。这包括打开浏览器，进行身份验证，然后不进行密钥交换。你会觉得这很容易。下面是我的资料。

public void Authenticate()
{
    var sb = new StringBuilder();
    sb.Append("https://accounts.google.com/o/oauth2/v2/auth");
    sb.Append("?client_id=<MY ID HERE>");
    sb.Append("&response_type=code");
    sb.Append("&scope=openid%20email");
    sb.Append("&redirect_uri=<MY PACKAGE NAME HERE>:/oauth2redirect");

    var url = sb.ToString();

    var uri = Android.Net.Uri.Parse("googlechrome://navigate?url=" + url);
    try
    {
        System.Diagnostics.Debug.WriteLine(uri.ToString());

        Intent i = new Intent(Intent.ActionView, uri);
        i.AddFlags(ActivityFlags.NewTask);
        i.AddFlags(ActivityFlags.SingleTop);
        i.AddFlags(ActivityFlags.ClearTop);
        i.AddFlags(ActivityFlags.NoHistory);
        Android.App.Application.Context.StartActivity(i);
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message);
    }
}

Answer 1

您使用的是chrome，而不是chrome自定义选项卡:

示例：

var sb = new StringBuilder()
    .Append("https://accounts.google.com/o/oauth2/v2/auth")
    .Append($"?client_id={clientID}")
    .Append("&response_type=code")
    .Append("&scope=https://www.googleapis.com/auth/drive")
    .Append($"&redirect_uri={PackageName}:/SushiRedirect");

var builder = new CustomTabsIntent.Builder(GetSession())
    .SetToolbarColor(Color.ParseColor(TOOLBAR_COLOR)).SetShowTitle(true)
    .SetStartAnimations(this, Resource.Animation.slide_in_right, Resource.Animation.slide_out_left)
    .SetExitAnimations(this, Resource.Animation.slide_in_left, Resource.Animation.slide_out_right)
    .SetCloseButtonIcon(BitmapFactory.DecodeResource(Resources, Resource.Drawable.ic_arrow_back));
var customTabsIntent = builder.Build();
CustomTabsHelper.AddKeepAliveExtra(this, customTabsIntent.Intent);
customTabsIntent.LaunchUrl(this, Uri.Parse(sb.ToString()));

并将意图筛选器添加到launchmode.singletask活动中，以捕获重定向并“关闭”shared选项卡。您的auth代码将位于Intent数据(Intent？.data？.tostring()):

[Activity(Label = "CustomTabsClient.Application", MainLauncher = true, Icon = "@drawable/ic_launcher", LaunchMode = LaunchMode.SingleTask)]
[IntentFilter(
    new[] { Intent.ActionView },
    Categories = new[] { Intent.CategoryDefault, Intent.CategoryBrowsable },
    DataScheme = "com.sushhangover.customtabsclient.example", DataPath = "/SushiRedirect")]

https://github.com/sushihangover/sushihangover.googlechrome.customtabs.shared