fix: empty file tags cause upload error for some providers (#7300)

* fix: empty file tags cause upload error for some providers

DigitalOcean and Linode object storage solutions do not accept `tags` option while uploading a file. Previously, tags option was set to default empty object. Now, we do not include it if it is empty.

* chore: add tests for saving a file with/without tags

* chore: update file tags handling to make tests pass

* chore: refactor file tag tests

* chore: update file tag tests

* chore: update changelog

* chore: update changelog entry

* chore: remove duplicated changelog entry

Author: alioguzhan

CHANGELOG.md

@@ -121,6 +121,7 @@ ___
 - Excluding keys that have trailing edges.node when performing GraphQL resolver (Chris Bland) [#7273](https://github.com/parse-community/parse-server/pull/7273)
 - Added centralized feature deprecation with standardized warning logs (Manuel Trezza) [#7303](https://github.com/parse-community/parse-server/pull/7303)
 - Use Node.js 15.13.0 in CI (Olle Jonsson) [#7312](https://github.com/parse-community/parse-server/pull/7312)
+- Fix file upload issue for S3 compatible storage (Linode, DigitalOcean) by avoiding empty tags property when creating a file (Ali Oguzhan Yildiz) [#7300](https://github.com/parse-community/parse-server/pull/7300)
 ___
 ## 4.5.0
 [Full Changelog](https://github.com/parse-community/parse-server/compare/4.4.0...4.5.0)

spec/ParseFile.spec.js

@@ -3,6 +3,7 @@
 
 'use strict';
 
+const { FilesController } = require('../lib/Controllers/FilesController');
 const request = require('../lib/request');
 
 const str = 'Hello World!';
@@ -205,6 +206,34 @@ describe('Parse.File testing', () => {
       notEqual(file.name(), 'hello.txt');
     });
 
+    it('saves the file with tags', async () => {
+      spyOn(FilesController.prototype, 'createFile').and.callThrough();
+      const file = new Parse.File('hello.txt', data, 'text/plain');
+      const tags = { hello: 'world' };
+      file.setTags(tags);
+      expect(file.url()).toBeUndefined();
+      const result = await file.save();
+      expect(file.name()).toBeDefined();
+      expect(file.url()).toBeDefined();
+      expect(result.tags()).toEqual(tags);
+      expect(FilesController.prototype.createFile.calls.argsFor(0)[4]).toEqual({
+        tags: tags,
+        metadata: {},
+      });
+    });
+
+    it('does not pass empty file tags while saving', async () => {
+      spyOn(FilesController.prototype, 'createFile').and.callThrough();
+      const file = new Parse.File('hello.txt', data, 'text/plain');
+      expect(file.url()).toBeUndefined();
+      expect(file.name()).toBeDefined();
+      await file.save();
+      expect(file.url()).toBeDefined();
+      expect(FilesController.prototype.createFile.calls.argsFor(0)[4]).toEqual({
+        metadata: {},
+      });
+    });
+
     it('save file in object', async done => {
       const file = new Parse.File('hello.txt', data, 'text/plain');
       ok(!file.url());

src/Routers/FilesRouter.js

@@ -166,16 +166,22 @@ export class FilesRouter {
         // update fileSize
         const bufferData = Buffer.from(fileObject.file._data, 'base64');
         fileObject.fileSize = Buffer.byteLength(bufferData);
+        // prepare file options
+        const fileOptions = {
+          metadata: fileObject.file._metadata,
+        };
+        // some s3-compatible providers (DigitalOcean, Linode) do not accept tags
+        // so we do not include the tags option if it is empty.
+        const fileTags =
+          Object.keys(fileObject.file._tags).length > 0 ? { tags: fileObject.file._tags } : {};
+        Object.assign(fileOptions, fileTags);
         // save file
         const createFileResult = await filesController.createFile(
           config,
           fileObject.file._name,
           bufferData,
           fileObject.file._source.type,
-          {
-            tags: fileObject.file._tags,
-            metadata: fileObject.file._metadata,
-          }
+          fileOptions
         );
         // update file with new data
         fileObject.file._name = createFileResult.name;