c# - Facebook web 应用程序扩展权限第二步不显示

Question

更新2这篇文章变老了，但仍然相关。下面是我解决它的方法。我标记了其他人的答案，因为我认为它更好地回答了问题。我在 accountcontroller 中调用了一个类似的方法(我即将重构:))。该字符串应该是一个列表...我想您明白了。

/// <summary>
    /// Use this method when an action fails due to lack of priviligies. It will redirect user to facebook with provided permission request.
    /// Refactor to handle list of request.
    /// </summary>
    /// <param name="permission"></param>
    private static void AddAdditionalPermissions(string permission)
    {
        System.Diagnostics.Trace.TraceInformation(permission + " not authorized for user.");
        string facebook_urlAuthorize_base = "https://graph.facebook.com/oauth/authorize";
        string scope = permission; //see: https://developers.facebook.com/docs/authentication/permissions/ for extended permissions
        string urlAuthorize = facebook_urlAuthorize_base;
        urlAuthorize += "?client_id=" + AppId;
        urlAuthorize += "&redirect_uri=" + "https://fbd.anteckna.nu/";
        urlAuthorize += "&scope=" + scope;

        //redirect the users browser to Facebook to ask the user to authorize our Facebook application
        HttpContext.Current.Response.Redirect(urlAuthorize, true); //this cannot be done using WebRequest since facebook may need to show dialogs in the users browser
    }

然后，使用 facebok C# SDK 调用 facebook(如/me/home)的每个方法都会捕获 FacebookOAuthException 并重定向到以下方法。这就是我们应用最佳实践的方式，即不预先征求用户许可，而是在需要时征求用户许可。此方法也应具有匹配的重定向 url，但我们才刚刚开始:)

希望对您有所帮助!

/// <summary>
    /// Check for what permissions to request or different ways to handle FacebookOAuthExceptions.
    /// </summary>
    /// <param name="foae">The exception object</param>
    public static void HandleAuthorizationsExceptions(FacebookOAuthException foae)
    {
        if (foae.Message.Contains("publish_permissions"))
        {
            AddAdditionalPermissions("publish_permissions");
        }
        else if (foae.Message.Contains("read_stream"))
        {
            AddAdditionalPermissions("read_stream");
        }
        else
        {
            System.Diagnostics.Trace.TraceError("Unhandled error at:" + foae.StackTrace);
        }
    }

更新:此行为是由 .Net oauth 实现引起的，该实现的范围硬编码在密封类中。添加了图 4 以显示请求参数，其中除了“电子邮件”(由 .net oauth 提供程序随所有请求一起发送)之外缺少其他范围。将“，publish_stream”添加到查询字符串会给我想要的行为。任何人都知道如何实现这一点？

请不要提交有关 Facebook 最佳实践或替代解决方案的答案或评论。我有一个替代解决方案，但希望它可以使用默认的 registerfacebookclient 参数。我已根据指定我要求的权限的两个答案更新了应用程序以仅使用 publish_stream。

图 4

原始问题:我正在设置一个应用程序(C#.Net4.5 MVC4，razor views)，它需要来自 facebook 的几乎所有可用用户权限。您可以在下面查看我如何设置所有内容的代码示例。

问题是，当单击图 1 中的“确定”时，Facebook 将我发送回我的应用程序。据我所知，应该有一个额外的屏幕(图 2)要求“更重”的权限。到目前为止，我只获得了图一中所述的权限。那部分工作...

图1

图2

所以，使用基本的授权配置.cs

var facebooksocialData = new Dictionary<string, object>();
            facebooksocialData.Add("scope", "email,publish_stream,read_stream,publish_actions,manage_pages,create_event,offline_access");
            OAuthWebSecurity.RegisterFacebookClient(
                appId: "165359673639901",
                appSecret: "15091cb2094a1996ae6c7b324f0300e6",
                displayName: "Facebook",
                extraData: facebooksocialData);

这就是我处理响应的方式，但这里 facebook 没有提示用户扩展权限，而只提示电子邮件，

AccountController.cs

 //
        // GET: /Account/ExternalLoginCallback

        [AllowAnonymous]
        public ActionResult ExternalLoginCallback(string returnUrl)
        {
            AuthenticationResult result = OAuthWebSecurity.VerifyAuthentication(Url.Action("ExternalLoginCallback", new { ReturnUrl = returnUrl }));
            if (!result.IsSuccessful)
            {
                return RedirectToAction("ExternalLoginFailure");
            }

            // Save the accesstoken into session
            Session["accesstoken"] = result.ExtraData["accesstoken"];
            Session["id"] = result.ExtraData["id"];

            if (OAuthWebSecurity.Login(result.Provider, result.ProviderUserId, createPersistentCookie: false))
            {
                return RedirectToLocal(returnUrl);
            }

            if (User.Identity.IsAuthenticated)
            {
                // If the current user is logged in add the new account
                OAuthWebSecurity.CreateOrUpdateAccount(result.Provider, result.ProviderUserId, User.Identity.Name);
                return RedirectToLocal(returnUrl);
            }
            else
            {
                // User is new, ask for their desired membership name
                string loginData = OAuthWebSecurity.SerializeProviderUserId(result.Provider, result.ProviderUserId);
                ViewBag.ProviderDisplayName = OAuthWebSecurity.GetOAuthClientData(result.Provider).DisplayName;
                ViewBag.ReturnUrl = returnUrl;
                return View("ExternalLoginConfirmation", new RegisterExternalLoginModel { UserName = result.UserName, ExternalLoginData = loginData });
            }
        }

我能找到的最接近答案的是 wp 插件，它有同样的问题。他们的问题通过将域设置为本地主机来解决。这就是我的应用程序的设置方式。

Answer 1

我遇到了同样的问题。正如您所做的那样，我用字典配置了 RegisterFacebookClient 来定义我的应用程序的范围，但不幸的是，该请求不包括我配置的范围。所以我找到了that .这似乎行得通，但这还不够。所以我找到了this .

所以这是解决我的问题的方法:

首先，我将这个新客户端添加到我的代码中:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using DotNetOpenAuth.AspNet;
using Newtonsoft.Json;

namespace MyApp.UI.Infrastructure
{
    public class FacebookScopedClient : IAuthenticationClient
    {
        private string appId;
        private string appSecret;
        private string scope;

        private const string baseUrl = "https://www.facebook.com/dialog/oauth?client_id=";
        public const string graphApiToken = "https://graph.facebook.com/oauth/access_token?";
        public const string graphApiMe = "https://graph.facebook.com/me?";

        private static string GetHTML(string URL)
        {
            string connectionString = URL;

            try
            {
                System.Net.HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(connectionString);
                myRequest.Credentials = CredentialCache.DefaultCredentials;
                //// Get the response
                WebResponse webResponse = myRequest.GetResponse();
                Stream respStream = webResponse.GetResponseStream();
                ////
                StreamReader ioStream = new StreamReader(respStream);
                string pageContent = ioStream.ReadToEnd();
                //// Close streams
                ioStream.Close();
                respStream.Close();
                return pageContent;
            }
            catch (Exception)
            {
            }
            return null;
        }

        private IDictionary<string, string> GetUserData(string accessCode, string redirectURI)
        {
            string token = GetHTML(graphApiToken + "client_id=" + appId + "&redirect_uri=" + HttpUtility.UrlEncode(redirectURI) + "&client_secret=" + appSecret + "&code=" + accessCode);
            if (token == null || token == "")
            {
                return null;
            }
            string access_token = token.Substring(token.IndexOf("access_token="), token.IndexOf("&"));
            string data = GetHTML(graphApiMe + "fields=id,name,email,username,gender,link&" + access_token);

            // this dictionary must contains
            Dictionary<string, string> userData = JsonConvert.DeserializeObject<Dictionary<string, string>>(data);
            return userData;
        }

        public FacebookScopedClient(string appId, string appSecret, string scope)
        {
            this.appId = appId;
            this.appSecret = appSecret;
            this.scope = scope;
        }

        public string ProviderName
        {
            get { return "facebook"; }
        }

        public void RequestAuthentication(System.Web.HttpContextBase context, Uri returnUrl)
        {
            string url = baseUrl + appId + "&redirect_uri=" + HttpUtility.UrlEncode(returnUrl.ToString()) + "&scope=" + scope;
            context.Response.Redirect(url);
        }

        public AuthenticationResult VerifyAuthentication(System.Web.HttpContextBase context)
        {
            string code = context.Request.QueryString["code"];

            string rawUrl = context.Request.Url.OriginalString;
            //From this we need to remove code portion
            rawUrl = Regex.Replace(rawUrl, "&code=[^&]*", "");

            IDictionary<string, string> userData = GetUserData(code, rawUrl);

            if (userData == null)
                return new AuthenticationResult(false, ProviderName, null, null, null);

            string id = userData["id"];
            string username = userData["username"];
            userData.Remove("id");
            userData.Remove("username");

            AuthenticationResult result = new AuthenticationResult(true, ProviderName, id, username, userData);
            return result;
        }
    }
}

我把它放在我的 asp.net 解决方案中的文件夹“infrastructure”中，接下来我更改我的旧配置，以便使用新的 facebook 客户端，如下所示:

旧代码:

OAuthWebSecurity.RegisterFacebookClient(
appId: "<app-id>",
appSecret: "<app-secret>",
displayName: "Facebook",
extraData: facebookExtraData);

新代码:

OAuthWebSecurity.RegisterClient(
                    new FacebookScopedClient(
                        "<app-id>",
                        "<app-secret>",
                        "scope"), 
                    "Facebook", 
                    null);

就是这样。它可能对您有所帮助，就像对我有所帮助一样。