fix: use raw fetch for Dropbox API instead of SDK, add better error logging

api/dropbox-proxy.js

@@ -1,34 +1,57 @@
-const Dropbox = require('dropbox').Dropbox;
+import fetch from 'node:fetch';
+
+const DROPBOX_APP_KEY = process.env.DROPBOX_APP_KEY;
+const DROPBOX_APP_SECRET = process.env.DROPBOX_APP_SECRET;
+const DROPBOX_REFRESH_TOKEN = process.env.DROPBOX_REFRESH_TOKEN;
+
+async function getAccessToken() {
+  const response = await fetch('https://api.dropboxapi.com/oauth2/token', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    body: `grant_type=refresh_token&refresh_token=${DROPBOX_REFRESH_TOKEN}&client_id=${DROPBOX_APP_KEY}&client_secret=${DROPBOX_APP_SECRET}`
+  });
+  const data = await response.json();
+  return data.access_token;
+}
 
 export default async function handler(req, res) {
+  const accessToken = await getAccessToken();
+  
   if (req.method === 'GET' && req.query.info === '1') {
-    const DBX = new Dropbox({ 
-      accessToken: process.env.DROPBOX_ACCESS_TOKEN 
-    });
-    
     try {
-      const fileInfo = await DBX.filesGetInfo({ path: '/Data-Matrix.xlsx' });
+      const fileInfo = await fetch('https://api.dropboxapi.com/2/files/get_metadata', {
+        method: 'POST',
+        headers: {
+          'Authorization': `Bearer ${accessToken}`,
+          'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({ path: '/Data-Matrix.xlsx' })
+      });
+      const data = await fileInfo.json();
       return res.json({
-        rev: fileInfo.result.rev,
-        size: fileInfo.result.size,
-        server_modified: fileInfo.result.server_modified
+        rev: data.rev,
+        size: data.size,
+        server_modified: data.server_modified
       });
     } catch (err) {
       return res.status(500).json({ error: err.message });
     }
   }
 
-  const DBX = new Dropbox({ 
-    accessToken: process.env.DROPBOX_ACCESS_TOKEN 
-  });
-
   try {
-    const upstream = await DBX.filesDownload({ path: '/Data-Matrix.xlsx' });
-    const buffer = Buffer.from(upstream.result.fileBinary);
+    const upstream = await fetch('https://content.dropboxapi.com/2/files/download', {
+      method: 'POST',
+      headers: {
+        'Authorization': `Bearer ${accessToken}`,
+        'Dropbox-API-Arg': JSON.stringify({ path: '/Data-Matrix.xlsx' })
+      }
+    });
+    
+    const buffer = await upstream.arrayBuffer();
     
     res.setHeader('Content-Type', 'application/octet-stream');
     res.setHeader('Cache-Control', 'no-store');
-    res.send(buffer);
+    res.send(Buffer.from(buffer));
   } catch (err) {
     console.error('Dropbox error:', err);
     res.status(500).send('Proxy error: ' + err.message);