Support Byte Range Requests

See parse-community/parse-server#6028

index.js

@@ -144,5 +144,26 @@ S3Adapter.prototype.getFileLocation = function(config, filename) {
   return (config.mount + '/files/' + config.applicationId + '/' + filename);
 }
 
+S3Adapter.prototype.getFileStream = async function(filename, req, res) {
+  const params = {
+    Key: this._bucketPrefix + filename,
+    Range: req.get('Range'),
+  };
+  await this.createBucket();
+  this._s3Client.getObject(params, (error, data) => {
+    if (error !== null || (data && !data.Body)) {
+      return res.sendStatus(404);
+    }
+    res.writeHead(206, {
+      'Accept-Ranges': data.AcceptRanges,
+      'Content-Length': data.ContentLength,
+      'Content-Range': data.ContentRange,
+      'Content-Type': data.ContentType,
+    });
+    res.write(data.Body);
+    res.end();
+  });
+}
+
 module.exports = S3Adapter;
 module.exports.default = S3Adapter;