numb86 · January 25, 2020 17:38
diff --git a/same-site-cookie.js b/same-site-cookie.js
 const http = require('http');
 const url = require('url');
 const querystring = require('querystring');

 const topPageHtml = `
 <html>
 <head><link rel="prerender" href="/confirm?prerender"></head>
 <body>
 <h2>Cookie を付与するドメイン</h2>
 <h3>確認ページへの遷移</h3>
 <p>
  <a href="/confirm">a タグ</a>
 </p>
 <p>
  <form action="/confirm" method="get">
    <button type="submit">form による get メソッドでのリクエストする</button>
  </form>
 </p>
 <p>
  <form action="/confirm" method="post">
    <button type="submit">form による post メソッドでのリクエストする</button>
  </form>
 </p>
 <p>
  <a href="/iframe">iframe 内の form からリクエストを行う</a>
 </p>
 <h3>
  <a href="http://sub.localhost:8081">別ドメインのサイト(sub.localhost:8081)に移動</a>
 </h3>
 <img src="/confirm?img">
 <script>
 fetch('/confirm?fetch', {credentials: 'include'});
 </script>
 </body>
 </html>
 `;

 const resTopPage = (req, res) => {
  res.setHeader('Set-Cookie', [
    'strict=value; SameSite=Strict; Max-Age=180',
    'lax=value; SameSite=Lax; Max-Age=180',
    'none=value; SameSite=None; Max-Age=180',
    'invalid=value; SameSite=Foo; Max-Age=180',
    'noSpecify=value; Max-Age=180',
  ]);
  res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
  res.write(topPageHtml);
  res.end();
 };

 const getCookieNames = cookie => Object.keys(querystring.parse(cookie, '; ')).join(', ');

 const showLog = req => {
  const {query} = url.parse(req.url);
  if (query === null) return;
  console.log(`request by ${query} ${getCookieNames(req.headers.cookie)}`);
 };

 const resConfirmPage = (req, res) => {
  showLog(req);
  res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
  res.write(`req.headers.cookie -> <b>${getCookieNames(req.headers.cookie)}</b>`);
  res.write('<br>');
  res.write(`req.method -> <b>${req.method}</b>`);
  res.write('<p>');
  res.write('<a href="/">トップページに移動</a>');
  res.write('</p>');
  res.write('<p>');
  res.write('<a href="http://sub.localhost:8081">別ドメインのサイト(sub.localhost:8081)に移動</a>');
  res.write('</p>');
  res.end();
 };

 const iframeGetHtml = `
 <body onload="document.forms[0].submit()">
  <form action="http://localhost:8080/confirm" method="get">
    <input type="hidden" name="iframe-get">
  </form>
 </body>
 `;

 const iframePostHtml = `
 <body onload="document.forms[0].submit()">
  <form action="http://localhost:8080/confirm?iframe-post" method="post">
  </form>
 </body>
 `;

 const iframePageHtml = `
 <p>
  iframe でリクエストを送りました。
 </p>
 <p>
  <a href="http://localhost:8080">http://localhost:8080 のトップページに移動</a>
 </p>
 <iframe width="0" height="0" style="visibility: hidden;" src="/iframe-get"></iframe>
 <iframe width="0" height="0" style="visibility: hidden;" src="/iframe-post"></iframe>
 `;

 const resIframePage = (req, res) => {
  res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
  res.write(iframePageHtml);
  res.end();
 };

 const routing = (req, res) => {
  switch(true) {
    case /^\/$/.test(req.url):
      resTopPage(req, res);
      break;
    case /^\/confirm/.test(req.url):
      resConfirmPage(req, res);
      break;
    case /^\/iframe-get$/.test(req.url):
      res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
      res.write(iframeGetHtml);
      res.end();
      break;
    case /^\/iframe-post$/.test(req.url):
      res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
      res.write(iframePostHtml);
      res.end();
      break;
    case /^\/iframe$/.test(req.url):
      resIframePage(req, res);
      break;
    default:
      res.writeHead(404);
      res.end();
  };
 };

 http.createServer((req, res) => {
  routing(req, res);
 }).listen(8080);

 const anotherDomainTopPageHtml = `
 <html>
 <head><link rel="prerender" href="http://localhost:8080/confirm?prerender" crossorigin="use-credentials"></head>
 <body>
 <h2>Cookie を付与したのとは別のドメイン</h2>
 <h3>確認ページへの遷移</h3>
 <p>
  <a href="http://localhost:8080/confirm">a タグ</a>
 </p>
 <p>
  <form action="http://localhost:8080/confirm" method="get">
    <button type="submit">form による get メソッドでのリクエストする</button>
  </form>
 </p>
 <p>
  <form action="http://localhost:8080/confirm" method="post">
    <button type="submit">form による post メソッドでのリクエストする</button>
  </form>
 </p>
 <p>
  <a href="/iframe">iframe 内の form からリクエストを行う</a>
 </p>
 <h3>
  <a href="http://localhost:8080">localhost:8080 に移動</a>
 </h3>
 <img src="http://localhost:8080/confirm?img">
 <script>
 fetch('http://localhost:8080/confirm?fetch', {credentials: 'include'});
 </script>
 </body>
 </html>
 `;

 http.createServer((req, res) => {
  switch(true) {
    case /^\/$/.test(req.url):
      res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
      res.write(anotherDomainTopPageHtml);
      res.end();
      break;
    case /^\/iframe-get$/.test(req.url):
      res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
      res.write(iframeGetHtml);
      res.end();
      break;
    case /^\/iframe-post$/.test(req.url):
      res.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
      res.write(iframePostHtml);
      res.end();
      break;
    case /^\/iframe$/.test(req.url):
      resIframePage(req, res);
      break;
    default:
      res.writeHead(404);
      res.end();
  };
 }).listen(8081);
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