使用 Google OAuth 2.0 和 C# 登录 [英] Login using Google OAuth 2.0 with C#
问题描述
我想允许用户使用 Gmail 登录.因此，我在谷歌上搜索并获得了许多示例，但都使用了 OpenID，并且当我查看了 Google 文档时，他们已经停止了 OpenID 的新域注册，从现在开始，开发人员将需要使用 OAuth API.
我已经注册了我的项目并获得了 Secrey KEY &客户 ID.现在我想将它集成到我的项目中，但我找不到任何示例工作项目.
请帮我解决这个问题.我没有使用 MVC.
I want to allow User to login using Gmail. So, I googled and got many samples but all were using OpenID and as I have checked Google Documentation, they have stopped new domain registration for OpenID and from now, Developer will need to use OAuth API.
I have registered my Project and got Secrey KEY & Client ID. Now I want to integrate it my Project but I am unable to find any sample working Project.
Please help me regarding this. I am not using MVC.
推荐答案
我是基于Google+ API讲解的，使用Gmail ID登录.因此，您将验证您的用户以使用 Gmail 登录.
I am explaining based on Google+ API, which uses Gmail ID to login. So, you will be authenticating your users to login with Gmail.
1:您需要开启Google+ API:
2:启用 Google+ API 后，您需要添加新的客户端 ID.
2: Once you turned on the Google+ API, then you need to add new Client ID.
Step 2
Step 3
在第 2 步中，当您添加重定向 URL 时，您需要添加您希望用户重定向到的页面的网站 URL.
为 Web 应用程序创建客户端 ID 后.
Once you have created your Client ID for Web Application.
那么在你的应用中，你需要添加两个包
Then in your application, you need to add two packages
1: Newtonsoft.Json
2: Microsoft.Net.Http
现在添加这个命名空间；
Now add this namespaces;
using Newtonsoft.Json;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
现在首先在代码中在页面顶部声明此变量；
Now in code first your declare this variables at top of your page;
protected string googleplus_client_id = "458878619548-khuatamj3qpiccnsm4q6dbulf13jumva.apps.googleusercontent.com"; // Replace this with your Client ID
protected string googleplus_client_secret = "4hiVJYlomswRd_PV5lyNQlfN"; // Replace this with your Client Secret
protected string googleplus_redirect_url = "http://localhost:2443/Index.aspx"; // Replace this with your Redirect URL; Your Redirect URL from your developer.google application should match this URL.
protected string Parameters;
然后在你的页面加载事件中；
Then in you Page Load event;
protected void Page_Load(object sender, EventArgs e)
{
if ((Session.Contents.Count > 0) && (Session["loginWith"] != null) && (Session["loginWith"].ToString() == "google"))
{
try
{
var url = Request.Url.Query;
if (url != "")
{
string queryString = url.ToString();
char[] delimiterChars = { '=' };
string[] words = queryString.Split(delimiterChars);
string code = words[1];
if (code != null)
{
//get the access token
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("https://accounts.google.com/o/oauth2/token");
webRequest.Method = "POST";
Parameters = "code=" + code + "&client_id=" + googleplus_client_id + "&client_secret=" + googleplus_client_secret + "&redirect_uri=" + googleplus_redirect_url + "&grant_type=authorization_code";
byte[] byteArray = Encoding.UTF8.GetBytes(Parameters);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ContentLength = byteArray.Length;
Stream postStream = webRequest.GetRequestStream();
// Add the post data to the web request
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
WebResponse response = webRequest.GetResponse();
postStream = response.GetResponseStream();
StreamReader reader = new StreamReader(postStream);
string responseFromServer = reader.ReadToEnd();
GooglePlusAccessToken serStatus = JsonConvert.DeserializeObject<GooglePlusAccessToken>(responseFromServer);
if (serStatus != null)
{
string accessToken = string.Empty;
accessToken = serStatus.access_token;
if (!string.IsNullOrEmpty(accessToken))
{
// This is where you want to add the code if login is successful.
// getgoogleplususerdataSer(accessToken);
}
}
}
}
}
catch (Exception ex)
{
//throw new Exception(ex.Message, ex);
Response.Redirect("index.aspx");
}
}
}
现在将调用 google API 的事件
Now the event that will call the google API
protected void Google_Click(object sender, EventArgs e)
{
var Googleurl = "https://accounts.google.com/o/oauth2/auth?response_type=code&redirect_uri=" + googleplus_redirect_url + "&scope=https://www.googleapis.com/auth/userinfo.email%20https://www.googleapis.com/auth/userinfo.profile&client_id=" + googleplus_client_id;
Session["loginWith"] = "google";
Response.Redirect(Googleurl);
}
添加这个 GooglePlusAccessToken 类；
// Google
public class GooglePlusAccessToken
{
public string access_token { get; set; }
public string token_type { get; set; }
public int expires_in { get; set; }
public string id_token { get; set; }
public string refresh_token { get; set; }
}
您也可以使用Access Token调用其他oauth API来获取一些用户信息.
Also you can call other oauth API with the Access Token to retrieve some of users information.
private async void getgoogleplususerdataSer(string access_token)
{
try
{
HttpClient client = new HttpClient();
var urlProfile = "https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + access_token;
client.CancelPendingRequests();
HttpResponseMessage output = await client.GetAsync(urlProfile);
if (output.IsSuccessStatusCode)
{
string outputData = await output.Content.ReadAsStringAsync();
GoogleUserOutputData serStatus = JsonConvert.DeserializeObject<GoogleUserOutputData>(outputData);
if (serStatus != null)
{
// You will get the user information here.
}
}
}
catch (Exception ex)
{
//catching the exception
}
}
public class GoogleUserOutputData
{
public string id { get; set; }
public string name { get; set; }
public string given_name { get; set; }
public string email { get; set; }
public string picture { get; set; }
}
希望这就是您要找的东西，我实现了它并且运行良好.希望这会有所帮助.
Hope this is what you were looking for, I implemented this and it is working just fine. Hope this helps.
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