cover.php

	/**
	 * @NoAdminRequired
	 * @NoCSRFRequired
	 */
	public function cover() {

		$albumId = $this->getIdFromSlug($this->params('albumIdOrSlug'));
		$album = $this->albumBusinessLayer->find($albumId, $this->userId);

		// try to extract the first picture from the first track on the album
		$tracks = $this->trackBusinessLayer->findAllByAlbum($albumId, $this->userId);
		$filePath = $this->userFolder->getById($tracks[0]->getFileId())[0]->getPath();
		$filePath = str_replace($this->userFolder->getPath(), '/files', $filePath);
		if ($this->preview->isAvailable($this->userFolder->getById($tracks[0]->getFileId())[0])) {
			$image = $this->preview->createPreview($filePath, 190, 190, true);
			return new DataDisplayResponse($image->data(), Http::STATUS_OK, ['Content-Type' => $image->mimeType()]);
		}
		$r = new Response();
		$r->setStatus(Http::STATUS_NOT_FOUND);
		return $r;
	}