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scripts/s3-backup/server.mjs

@@ -214,13 +214,36 @@ async function handle(req, res) {
     if (!fs.existsSync(file)) {
       return send(res, 404, xml('<Error><Code>NoSuchKey</Code><Message>Not Found</Message></Error>'));
     }
-    const data = fs.readFileSync(file);
+    const stat = fs.statSync(file);
+    const etag = etagFor(fs.readFileSync(file));
+    const range = req.headers.range;
+    if (range) {
+      const match = /^bytes=(\d+)-(\d*)$/i.exec(range);
+      if (match) {
+        const start = Number(match[1]);
+        const end = match[2] ? Number(match[2]) : stat.size - 1;
+        if (start >= stat.size || end < start) {
+          res.writeHead(416, { 'Content-Range': `bytes */${stat.size}` });
+          return res.end();
+        }
+        const length = end - start + 1;
+        res.writeHead(206, {
+          'Content-Type': 'application/octet-stream',
+          'Content-Length': length,
+          'Content-Range': `bytes ${start}-${end}/${stat.size}`,
+          'Accept-Ranges': 'bytes',
+          ETag: etag,
+        });
+        return fs.createReadStream(file, { start, end }).pipe(res);
+      }
+    }
     res.writeHead(200, {
       'Content-Type': 'application/octet-stream',
-      'Content-Length': data.length,
-      ETag: etagFor(data),
+      'Content-Length': stat.size,
+      'Accept-Ranges': 'bytes',
+      ETag: etag,
     });
-    return res.end(data);
+    return fs.createReadStream(file).pipe(res);
   }
 
   if (req.method === 'HEAD' && key) {
@@ -231,6 +254,7 @@ async function handle(req, res) {
     const stat = fs.statSync(file);
     return send(res, 200, '', {
       'Content-Length': stat.size,
+      'Accept-Ranges': 'bytes',
       ETag: etagFor(fs.readFileSync(file)),
     });
   }