Create app.js

app.js

@@ -0,0 +1,43 @@
+const express = require('express');
+const axios = require('axios');
+const qs = require('qs');
+const app = express();
+
+// Google OAuth 2.0の設定
+const client_id = '1033286471224-n9mv8l869fqikubj2e8q92n8ige3qr6r.apps.googleusercontent.com';
+const client_secret = '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';
+const redirect_uri = 'YOUR_REDIRECT_URI';  // 自分のリダイレクトURIに変更
+
+app.get('/auth/google', (req, res) => {
+  const authUrl = `https://accounts.google.com/o/oauth2/auth?client_id=${client_id}&redirect_uri=${redirect_uri}&response_type=code&scope=https://www.googleapis.com/auth/drive.file`;
+  res.redirect(authUrl);
+});
+
+app.get('/auth/google/callback', async (req, res) => {
+  const code = req.query.code;
+
+  // Googleからアクセストークンを取得
+  const tokenUrl = 'https://oauth2.googleapis.com/token';
+  const params = {
+    code: code,
+    client_id: client_id,
+    client_secret: client_secret,
+    redirect_uri: redirect_uri,
+    grant_type: 'authorization_code',
+  };
+
+  try {
+    const response = await axios.post(tokenUrl, qs.stringify(params), {
+      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    });
+
+    const accessToken = response.data.access_token;
+    res.json({ accessToken });  // フロントエンドにアクセストークンを返す
+  } catch (error) {
+    res.status(500).json({ error: 'Failed to exchange code for token' });
+  }
+});
+
+app.listen(3000, () => {
+  console.log('Server is running on port 3000');
+});