AWS S3 Adapter: retrieve mime type from file content

[miloslavkostir]

Feature Request

Q	A
Adapter Name	AwsS3V3Adapter

Some services don't support Content-Type as a request parameter for PutObject e.g. Dell PowerScale OneFS see OneFS S3 API doc On the other hand, some developers may prefer retrieving mime type from file content in the function AwsS3V3Adapter::mimeType() instead of getting it from HeadObject

What about creating (an optional) feature for retrieving content type from file content? Something like this:

$mimetype = $this->mimeTypeDetector->detectMimeTypeFromBuffer(fread($this->readStream($path), 1024));

Ideally I could the function enable/disable in the options.

[miloslavkostir]

Like this https://github.com/miloslavkostir/flysystem/commit/229437159c4b0b0d91f849a83e1e8fcd304398de