使用 Xamarin.Auth 重新请求 facebook 权限答案

【问题标题】：Rerequest a facebook permission with Xamarin.Auth使用 Xamarin.Auth 重新请求 facebook 权限
【发布时间】：2016-08-22 18:47:07
【问题描述】：

我正在尝试重新请求 Facebook 中被拒绝的权限。

根据 facebook 开发人员的说法，一旦有人拒绝了权限，登录对话框将不会重新请求他们，除非您明确告诉对话框您正在重新请求拒绝的权限。

您可以通过将auth_type=rerequest 参数添加到您的登录来做到这一点。

我做了这个，但是不工作

var auth = new OAuth2Authenticator(
            clientId: "my app id", // your OAuth2 client id
            scope: "email", // the scopes for the particular API you're accessing, delimited by "+" symbols
            authorizeUrl: new Uri("https://m.facebook.com/dialog/oauth/"),
            redirectUrl: new Uri("http://www.facebook.com/connect/login_success.html"));

        progressDialog.Show();
        auth.Completed += async (sender, eventArgs) =>
        {
            if (eventArgs.IsAuthenticated)
            {
                var accessToken = eventArgs.Account.Properties["access_token"].ToString();
                var expiresIn = Convert.ToDouble(eventArgs.Account.Properties["expires_in"]);
                var expiryDate = DateTime.Now + TimeSpan.FromSeconds(expiresIn);

                IDictionary<string, string> hashRequest = new Dictionary<string, string>();
                hashRequest.Add("auth_type", "rerequest");

                var request = new OAuth2Request("GET", new Uri("https://graph.facebook.com/me?fields=education,email,location,name"),hashRequest, eventArgs.Account);
                var response = await request.GetResponseAsync();
                var obj = JObject.Parse(response.GetResponseText()); ...

【问题讨论】：

标签： facebook xamarin xamarin.android xamarin.auth

【解决方案1】：

我解决了将一些属性附加到 html 请求的问题。

    var auth = new OAuth2Authenticator (
            clientId: "myappid", // your OAuth2 client id
            scope: "email", // the scopes for the particular API you're accessing, delimited by "+" symbols
            authorizeUrl: new Uri ("https://m.facebook.com/dialog/oauth?auth_type=rerequest&client_id=myappid&" +
                                  "redirect_uri=http://www.facebook.com/connect/login_success.html&scope=email/"),
            redirectUrl: new Uri ("http://www.facebook.com/connect/login_success.html"));

【讨论】：