如何为我的asp.net web应用程序获得Google Api OAuth 2刷新令牌

Question

我正在尝试在我的Asp.net应用程序(C#)中使用OAuth 2。问题是我需要使用一个共享的谷歌帐户。要做到这一点，我的计划是用一个令牌、一个过期日期和一个刷新令牌为身份验证种子，然后当需要身份验证时，我检查过期日期并使用刷新令牌。

我用于身份验证的示例如下：

UserCredential credential;
using (var stream = new FileStream("client_secrets.json", FileMode.Open, FileAccess.Read))
{
credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
// This OAuth 2.0 access scope allows an application to upload files to the
// authenticated user's YouTube channel, but doesn't allow other types of access.
new[] { YouTubeService.Scope.YoutubeUpload },
"user",
CancellationToken.None
);
}

并且似乎不包含具有刷新令牌的对象。

如何获取刷新令牌和到期日期？

Answer 1

解决方案是执行后期操作并手动解析结果，而不是使用任何Google类。

string gurl = "code=" + code + "&client_id=" + client_id +
"&client_secret=" + client_secret + "&redirect_uri=" + redirect_uri + "&grant_type=" + grant_type;
string url = "https://www.googleapis.com/oauth2/v3/token";
// creates the post data for the POST request
string postData = (gurl);
// create the POST request
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
webRequest.Host ="www.googleapis.com";
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ContentLength = postData.Length;
// POST the data
using (StreamWriter requestWriter2 = new StreamWriter(webRequest.GetRequestStream()))
{
requestWriter2.Write(postData);
}
//This actually does the request and gets the response back
HttpWebResponse resp = (HttpWebResponse)webRequest.GetResponse();
string googleAuth;
using (StreamReader responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream()))
{
//dumps the HTML from the response into a string variable
googleAuth = responseReader.ReadToEnd();
}

从那里开始，我主要需要解析googleAuth字符串，以获取令牌、刷新令牌和到期期限。我一直期待着在Google类中有一个解决方案来解决一个非常常见的请求，但显然我会创建自己的类。