使用应用程序脚本登录网站以获取我的个人资料名称失败

Question

我一直试图使用我的凭据登录此网站，以便使用谷歌应用程序脚本获取我的个人资料名称。状态代码是200，我可以看到脚本能够获得cookie。但是，我得到的结果是Undefined，而不是配置文件名称。

这就是我的尝试：

function loginAndParseProfile() {
var link = 'https://stackoverflow.com/users/login?ssrc=head&returnurl=https%3a%2f%2fstackoverflow.com%2f';
var options = {
"method": "get",
"headers": {
"User-Agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36"
}
};
var res = UrlFetchApp.fetch(link, options);
var $ = Cheerio.load(res.getContentText());
var fkey = $("input[name='fkey']").first().attr('value');
var payload = {
'fkey': fkey,
'ssrc': 'head',
'email': 'emailaddress',
'password': 'password',
'oauth_version': '',
'oauth_server': ''
};
var options = {
"method" : "post",
'payload': payload,
'muteHttpExceptions': true,
"headers": {
"Content-Type": "application/x-www-form-urlencoded",
"User-Agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36",
}
};
var loginURL = "https://stackoverflow.com/users/login?ssrc=head&returnurl=https%3a%2f%2fstackoverflow.com%2f";
var resp = UrlFetchApp.fetch(loginURL,options);
console.log(resp.getResponseCode());
console.log(resp.getAllHeaders()['Set-Cookie']);
var $ = Cheerio.load(resp.getContentText());
var item = $('a.my-profile > [class^="gravatar-wrapper"]').first().attr('title');
console.log(item);
}

如何使脚本工作？

Answer 1

1. 通过将followRedirects设置为false:禁用重定向

   var options = {
   "method" : "post",
   'payload': payload,
   'muteHttpExceptions': true,
   "headers": {
   "Content-Type": "application/x-www-form-urlencoded",
   "User-Agent": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36",
   },
   'followRedirects': false
   };
   

2. 从对POST /users/login请求的响应中获取acctcookie：

   const acct = resp.getAllHeaders()['Set-Cookie']
   .find(cookie => cookie.includes('acct=t='))
   .match(/(acct=t=.*?)s/)[1];
   

3. 提出GET /请求，提供acctcookie，并获取您的配置文件名称：

   const profileRequest = UrlFetchApp.fetch('https://stackoverflow.com', {
   method: 'get',
   headers: {
   Cookie: acct
   }
   });
   const $main = Cheerio.load(profileRequest.getContentText());
   const myName = $main('.s-topbar--item.s-user-card > span').text();
   console.log(myName);
   

如果凭据正确，则应输出robots.txt。