MimeTypeExtensionMap.php

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<?php
namespace Magento\Catalog\Model\Product\Gallery;

class MimeTypeExtensionMap
{
    protected $mimeTypeExtensionMap = [
        'image/jpg' => 'jpg',
        'image/jpeg' => 'jpg',
        'image/gif' => 'gif',
        'image/png' => 'png',
    ];

    public function getMimeTypeExtension($mimeType)
    {
        if (isset($this->mimeTypeExtensionMap[$mimeType])) {
            return $this->mimeTypeExtensionMap[$mimeType];
        } else {
            return "";
        }
    }
}