c# - MVC4 的严重 OAuth 问题

Question

我在使用 OAuth 和 Facebook 时遇到问题。我正在使用 MVC4 标准 OAuth 登录。我在本地没有问题，但在服务器上这被证明是一个问题。

如果我将以下 URL 粘贴到浏览器中，它就可以正常工作:

http://localhost:46260/Account/ExternalLoginCallback?ReturnUrl=%2FDashboard&__provider__=FacebookPro&__sid__=1234somesid456  // this is autogenerated

当我将 Facebook 中应用程序的 URL 更改为当前域并将此 URL 粘贴进去时，我被重定向到不成功的登录页面:

http://freersvp.mytakeawaysite.com:80/Account/ExternalLoginCallback?ReturnUrl=%2FDashboard&__provider__=Facebook+Pro&__sid__=1234someid456  // note this is autogenerated

N.B 以上两个url是重定向uri

以下 URL 是所请求的并导致异常:

网址

https://graph.facebook.com/oauth/access_token?client_id=52*********37&redirect_uri=http%3a%2f%2ffreersvp.mytakeawaysite.com%3a80%2fAccount%2fExternalLoginCallback%3fReturnUrl%3d%252FDashboard%26__provider__%3dFacebook%2bPro%26__sid__%3d3c92eb7e84304afc931ef0ea7b62f56a&client_secret=2123***********4256&code=AQAQIJsj-ondldllVYKdpxJaZouqrlg9sjTcfUxyWhAw8MXbD2DvsOSujg2m7E3s3cvNusCI0ZZoJAuGgu_FLkPyjYMQAkTWDVyHTcAoJD-tezyXgn0vhoFzX3FmuRBHYpyJEM-dk0KgF5ugsTHo9yGjBjrcfMDUGu9IxkKQ36k3gMrwocM1_l5t342Q2kIOHdt8pPcyrs--NzgNyZv48vSq7jkZwuQ95xRjUHG5J-ptcgq0l2BlqjzHDDuvIFH23lpMWHzzqdejdj5ejukz7t_Fnhx-mrpVdcRYhP3JeZ2UOTjAyKQmUB3rInooECcjq4c

异常

  {
       "error": {
          "message": "Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request",
          "type": "OAuthException",
          "code": 100
       }
    }

string token 在下面代码的 GetUserData 函数中返回 null:

我正在使用 FacebookScopedClient:

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 ex)
        {
        }
        return null;
    }

    private IDictionary<string, string> GetUserData(string accessCode, string redirectURI)
    {
        SessionControl ctl = new SessionControl();
        ctl.SaveParam("redirecturi", redirectURI, -3);
        ctl.Dispose();
        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);

        try
        {


        }
        catch { }
        // this dictionary must contains
        Dictionary<string, string> userData = JsonConvert.DeserializeObject<Dictionary<string, string>>(data);
        userData.Add("accesstoken", access_token);

        try
        {
            userData.Add("id", userData["id"]);
        }
        catch { }
        return userData;
    }

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

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

    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["email"];

        if(username == null || username == "")
        {
            username = userData["username"];
        }
        //userData.Remove("id");
        userData.Remove("username");

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

Answer 1

在通过 url 解码器运行导致错误的已发布 url 之后，由于某种原因，问题在于您的 url 编码了整个查询字符串，而不仅仅是 url。

您会在该 url 中注意到一堆 %26 项目，这些项目是 url 编码的 & 这就是引发错误的原因。 Facebook 解析器看到 %26 而不是 &，并将其视为一个参数。

& 在发送到页面时分隔 url 查询字符串参数。如果没有完整的代码，我无法告诉您去哪里查看，但在您的代码中的某些地方您完全编码了整个查询字符串，并且需要找到那段代码并且只对嵌入的 url 进行编码。

好的，阅读完内容后可以试试这个理论。

我认为您的代码正在从 Facebook 接收这些内容，经过 url 编码，然后您的系统正在对其进行重新编码。尝试获取任何收到的内容，首先对其进行 url 解码、操作，然后根据需要重新编码。

希望对你有帮助