谷歌开放式验证2.0增益ACCESS_TOKEN在服务器端（错误请求错误，ProtocolError） [英] Google Open Auth 2.0 gain access_token on server side (Bad Request error, ProtocolError)

问题描述

我想通过谷歌开放式验证2.0实现用户身份验证。我已经成功地从谷歌获得code和我现在试图获得的access_token接入用户的信息。这是控制器的code：

公共无效谷歌（字符串code）
    {
        如果（！string.IsNullOrWhiteSpace（code）条）
        {
            VAR参数=新词典与LT;字符串，字符串＆GT;（）;
            参数[code] = code;
            参数[的client_id] = ConfigurationProvider.GoogleApplicationId;
            参数[client_secret] = ConfigurationProvider.GoogleClientSecret;
            参数[REDIRECT_URI] =HTTP：//本地主机：1291+ Url.Action（GoogleAuth）;
            参数[grant_type] =authorization_ code;            VAR keyValuePairs =新的字符串[parameters.Count]
            变种I = 0;
            常量字符串keyValueTemplate ={0} = {1};            的foreach（在参数变量参数）
            {
                keyValuePairs [I] =的String.Format（keyValueTemplate，parameter.Key，parameter.Value）;
                我++;
            }            变种parametersString =的string.join（与＆amp;，keyValuePairs）;
            // $c$c=$c$c&client_id=MY.apps.googleusercontent.com&client_secret=SECRET&redirect_uri=http://localhost:1291/Account/GoogleAuth&grant_type=authorization_$c$c            常量字符串URI =htt​​ps://accounts.google.com/o/oauth2/token;            VAR的WebClient =新的WebClient（）;
            webClient.Headers [Htt的prequestHeader.ContentType] =应用/的X WWW的形式urlen codeD;
            webClient.UploadString（URI，POST，parametersString）; //这里我得到错误的请求例外。
        }
    }


另外，异常包含状态，等于ProtocolError。我有同样的错误，即使我努力使POST空parametersString。

我将AP preciate的任何意见或建议。

感谢

编辑：
我也试过这个片段既没有参数（有相同的错误）：

  VAR数据=新的N​​ameValueCollection
               {
                   {code，code}，
                   {CLIENT_ID，ConfigurationProvider.GoogleApplicationId}，
                   {client_secret，ConfigurationProvider.GoogleClientSecret}，
                   {REDIRECT_URI，HTTP：//本地主机：1291+ Url.Action（GoogleAuth）}，
                   {grant_type，authorization_ code}
               };    VAR的WebClient =新的WebClient（）;
    webClient.Headers [Htt的prequestHeader.ContentType] =应用/的X WWW的形式urlen codeD; //带和不带这个头？
    VAR的结果= webClient.UploadValues​​（URI，POST，数据）;
 

解决方案

您REDIRECT_URI，必须正确转义，否则，你得到一个错误的URL。

 参数[REDIRECT_URI] = Uri.EscapeDataString（_redirectUri）;
 

I'm trying to implement user Authentication via Google Open Auth 2.0. I've already succeed to gain "code" from Google and now I'm trying to gain access_token to access users' info. This is code of the controller:

    public void Google(string code)
    {
        if (!string.IsNullOrWhiteSpace(code))
        {
            var parameters = new Dictionary<string, string>();
            parameters["code"] = code;
            parameters["client_id"] = ConfigurationProvider.GoogleApplicationId;
            parameters["client_secret"] = ConfigurationProvider.GoogleClientSecret;
            parameters["redirect_uri"] = "http://localhost:1291" + Url.Action("GoogleAuth");
            parameters["grant_type"] = "authorization_code";

            var keyValuePairs = new string[parameters.Count];
            var i = 0;
            const string keyValueTemplate = "{0}={1}";

            foreach (var parameter in parameters)
            {
                keyValuePairs[i] = string.Format(keyValueTemplate, parameter.Key, parameter.Value);
                i++;
            }

            var parametersString = string.Join("&", keyValuePairs);
            // code=CODE&client_id=MY.apps.googleusercontent.com&client_secret=SECRET&redirect_uri=http://localhost:1291/Account/GoogleAuth&grant_type=authorization_code

            const string uri = "https://accounts.google.com/o/oauth2/token";

            var webClient = new WebClient();
            webClient.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
            webClient.UploadString(uri, "POST", parametersString); // Here I get Bad Request exception.
        }
    }

Also the exception contains Status that equals "ProtocolError". I have the same error even if I try to make POST with empty parametersString.

I'll appreciate any advice or suggestion.

Thanks

Edit: I also tried this snippet both with and without parameters(have the same error):

var data = new NameValueCollection
               {
                   {"code", code},
                   {"client_id", ConfigurationProvider.GoogleApplicationId},
                   {"client_secret", ConfigurationProvider.GoogleClientSecret},
                   {"redirect_uri", "http://localhost:1291" + Url.Action("GoogleAuth")},
                   {"grant_type", "authorization_code"}
               };

    var webClient = new WebClient();
    webClient.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded"; // with and without this header...
    var result = webClient.UploadValues(uri, "POST", data);

解决方案

Your redirect_uri has to be escaped correctly, otherwise you get a malformed URL.

parameters["redirect_uri"] = Uri.EscapeDataString(_redirectUri);

这篇关于谷歌开放式验证2.0增益ACCESS_TOKEN在服务器端（错误请求错误，ProtocolError）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！