/**
* Transforms an Image with some resizing information into an ETag.
*
* @param ImageInterface $image Image
* @param string $height Height
* @param string $width Width
* @param string $type Type of resizing
*
* @return string ETag generated
*/
public function transform(ImageInterface $image, $height, $width, $type)
{
return sha1($image->getId() . '.' . $image->getUpdatedAt()->getTimestamp() . '.' . $height . '.' . $width . '.' . $type);
}
