Create index.js

index.js

@@ -0,0 +1,60 @@
+const express = require('express');
+const fetch = require('node-fetch');
+const cheerio = require('cheerio');
+const { URL } = require('url');
+
+const app = express();
+const PORT = 7860;
+
+function absolutize(base, relative) {
+  try {
+    return new URL(relative, base).toString();
+  } catch {
+    return relative;
+  }
+}
+
+app.get('/proxy', async (req, res) => {
+  const targetUrl = req.query.url;
+  if (!targetUrl) {
+    return res.status(400).send('Missing ?url= parameter');
+  }
+
+  try {
+    const response = await fetch(targetUrl);
+    const contentType = response.headers.get('content-type') || '';
+
+    if (contentType.includes('text/html')) {
+      const html = await response.text();
+      const $ = cheerio.load(html);
+      const base = targetUrl;
+
+      // 書き換える属性
+      const attributes = ['href', 'src', 'action'];
+
+      $('*').each((i, el) => {
+        attributes.forEach(attr => {
+          const val = $(el).attr(attr);
+          if (val && !val.startsWith('data:') && !val.startsWith('javascript:')) {
+            const abs = absolutize(base, val);
+            $(el).attr(attr, `/proxy?url=${encodeURIComponent(abs)}`);
+          }
+        });
+      });
+
+      res.set('Content-Type', 'text/html');
+      res.send($.html());
+    } else {
+      // HTML以外はそのままパイプ
+      res.set('Content-Type', contentType);
+      response.body.pipe(res);
+    }
+  } catch (err) {
+    console.error(err);
+    res.status(500).send('プロキシエラー: ' + err.message);
+  }
+});
+
+app.listen(PORT, () => {
+  console.log(`🌐 Proxy server running at http://localhost:${PORT}`);
+});