MIME-Type Detection
The Database Adapter uses the MIME-Type Detector package to detect files' MIME-Type. When a file is written, the MIME-Type is automatically detected at set.
Note
The MIME-Type Detector package behaves differently than league/mime-type-detection. It does not offer any fallback mechanism that uses a file's extension. MIME-Type is detected ONLY via a file's content!
Specify Custom MIME-Type
You can choose to provide a custom MIME-Type via the $config array argument, when writing a file.
$filesystem->write('books/great_new_world.txt', '...', [
'mime_type' => 'application/ext-custom'
])
Custom MIME-Type Detector Callback
Alternatively, if the default provided MIME-Type detection mechanism is not to your liking, then you can specify a custom callback to perform detection. The following example shows how you switch the default detection to league/mime-type-detection.
use Aedart\Contracts\Streams\FileStream;
use League\Flysystem\Config;
use League\MimeTypeDetection\FinfoMimeTypeDetector;
$adapter->detectMimeTypeUsing(function(FileStream $stream, Config $config) {
$detector = new FinfoMimeTypeDetector();
$content = $stream->read(512);
$uri = $stream->uri();
$stream->positionToStart();
return $detector->detectMimeType($uri, $content);
});
The callback MUST return a string MIME-Type or null, if unable to detect.