我正在尝试将Google日历集成到我的应用程序中,并且我在使用关闭RefreshToken的OAuth授权方面遇到了一些问题。我收到一个没有问题的AccessToken,但RefreshToken属性为null。请参阅标记为“ERROR HERE:”的行,了解我遇到问题的地方
我的Asp.Net MVC控制器(名为OAuthController
)如下所示:
public ActionResult Index()
{
var client = CreateClient();
client.RequestUserAuthorization(new[] { "https://www.googleapis.com/auth/calendar" }, new Uri("http://localhost/FL.Evaluation.Web/OAuth/CallBack"));
return View();
}
public ActionResult CallBack()
{
if (string.IsNullOrEmpty(Request.QueryString["code"])) return null;
var client = CreateClient();
// Now getting a 400 Bad Request here
var state = client.ProcessUserAuthorization();
// ERROR HERE: The RefreshToken is NULL
HttpContext.Session["REFRESH_TOKEN"] = Convert.ToBase64String(Encoding.Unicode.GetBytes(state.RefreshToken));
return JavaScript("Completed!");
}
private static WebServerClient CreateClient()
{
return
new WebServerClient(
new AuthorizationServerDescription()
{
TokenEndpoint = new Uri("https://accounts.google.com/o/oauth2/token"),
AuthorizationEndpoint = new Uri("https://accounts.google.com/o/oauth2/auth"),
ProtocolVersion = ProtocolVersion.V20
}
, _GoogleClientId, _GoogleSecret);
}
我在Google的API文档中看到,我需要确保将access_type
请求设置为offline
以便发送RefreshToken。如何在我的Authenticator请求中设置此值?
答案 0 :(得分:12)
在为{。}发布了DotNetOpenAuth和Google APIs之后的几个小时,我无处可去。我决定绕过库并直接使用本地HttpRequest和HttpResponse对象直接访问Google REST API。我的MVC控制器的清理代码如下:
private static string _GoogleClientId = "CLIENT_ID";
private static string _GoogleSecret = "SECRET";
private static string _ReturnUrl = "http://localhost/OAuth/CallBack";
public ActionResult Index()
{
return Redirect(GenerateGoogleOAuthUrl());
}
private string GenerateGoogleOAuthUrl()
{
//NOTE: Key piece here, from Andrew's reply -> access_type=offline forces a refresh token to be issued
string Url = "https://accounts.google.com/o/oauth2/auth?scope={0}&redirect_uri={1}&response_type={2}&client_id={3}&state={4}&access_type=offline&approval_prompt=force";
string scope = UrlEncodeForGoogle("https://www.googleapis.com/auth/calendar https://www.googleapis.com/auth/calendar.readonly").Replace("%20", "+");
string redirect_uri_encode = UrlEncodeForGoogle(_ReturnUrl);
string response_type = "code";
string state = "";
return string.Format(Url, scope, redirect_uri_encode, response_type, _GoogleClientId, state);
}
private static string UrlEncodeForGoogle(string url)
{
string UnReservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";
var result = new StringBuilder();
foreach (char symbol in url)
{
if (UnReservedChars.IndexOf(symbol) != -1)
{
result.Append(symbol);
}
else
{
result.Append('%' + String.Format("{0:X2}", (int)symbol));
}
}
return result.ToString();
}
class GoogleTokenData
{
public string Access_Token { get; set; }
public string Refresh_Token { get; set; }
public string Expires_In { get; set; }
public string Token_Type { get; set; }
}
public ActionResult CallBack(string code, bool? remove)
{
if (remove.HasValue && remove.Value)
{
Session["GoogleAPIToken"] = null;
return HttpNotFound();
}
if (string.IsNullOrEmpty(code)) return Content("Missing code");
string Url = "https://accounts.google.com/o/oauth2/token";
string grant_type = "authorization_code";
string redirect_uri_encode = UrlEncodeForGoogle(_ReturnUrl);
string data = "code={0}&client_id={1}&client_secret={2}&redirect_uri={3}&grant_type={4}";
HttpWebRequest request = HttpWebRequest.Create(Url) as HttpWebRequest;
string result = null;
request.Method = "POST";
request.KeepAlive = true;
request.ContentType = "application/x-www-form-urlencoded";
string param = string.Format(data, code, _GoogleClientId, _GoogleSecret, redirect_uri_encode, grant_type);
var bs = Encoding.UTF8.GetBytes(param);
using (Stream reqStream = request.GetRequestStream())
{
reqStream.Write(bs, 0, bs.Length);
}
using (WebResponse response = request.GetResponse())
{
var sr = new StreamReader(response.GetResponseStream());
result = sr.ReadToEnd();
sr.Close();
}
var jsonSerializer = new JavaScriptSerializer();
var tokenData = jsonSerializer.Deserialize<GoogleTokenData>(result);
Session["GoogleAPIToken"] = tokenData.Access_Token;
return JavaScript("Refresh Token: " + tokenData.Refresh_Token);
}
非常感谢Kelp了解此代码段中的一些代码。
答案 1 :(得分:9)
调整GoogleAuthenticationServer.Description
以在查询字符串中包含?access_type=offline
的授权端点URI。
答案 2 :(得分:0)
只需添加
AccessType =&#34;离线&#34;,
到GoogleOAuth2AuthenticationOptions()对象。