Updae theme and fix some bug (#1711)

packages/service/common/file/gridfs/utils.ts

@@ -0,0 +1,15 @@
+export const gridFsStream2Buffer = (stream: NodeJS.ReadableStream) => {
+  return new Promise<Buffer>((resolve, reject) => {
+    let tmpBuffer: Buffer = Buffer.from([]);
+
+    stream.on('data', (chunk) => {
+      tmpBuffer = Buffer.concat([tmpBuffer, chunk]);
+    });
+    stream.on('end', () => {
+      resolve(tmpBuffer);
+    });
+    stream.on('error', (err) => {
+      reject(err);
+    });
+  });
+};