AmpacheController::playlist_songs() - Code Metrics - Inspection of "Ampache: First version of JSON support" - owncloud/music - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Push — master ( 1bf36a...3f521f )

by Pauli
created 2020-06-15 19:32 UTC
AmpacheController::playlist_songs() A

↳ Parent: AmpacheController
Complexity

Conditions	2
Paths	2
Size

Total Lines	11
Code Lines	8
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	0
CRAP Score	6
Importance

Changes	2
Bugs	0	Features	0
Metric	Value
cc	2
eloc	8
nc	2
nop	4
dl	0
loc	11
ccs	0
cts	8
cp	0
crap	6
rs	10
c	2
b	0
f	0
<?php

/**
 * ownCloud - Music app
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Morris Jobke <[email protected]>
 * @author Pauli Järvinen <[email protected]>
 * @copyright Morris Jobke 2013, 2014
 * @copyright Pauli Järvinen 2017 - 2020
 */

namespace OCA\Music\Controller;

use \OCP\AppFramework\Controller;
filter:
    dependency_paths: ["lib/*"]
use \OCP\AppFramework\Http\JSONResponse;
filter:
    dependency_paths: ["lib/*"]
use \OCP\IRequest;
filter:
    dependency_paths: ["lib/*"]
use \OCP\IURLGenerator;
filter:
    dependency_paths: ["lib/*"]

use \OCA\Music\AppFramework\BusinessLayer\BusinessLayer;
use \OCA\Music\AppFramework\BusinessLayer\BusinessLayerException;
use \OCA\Music\AppFramework\Core\Logger;
use \OCA\Music\Middleware\AmpacheException;

use \OCA\Music\BusinessLayer\AlbumBusinessLayer;
use \OCA\Music\BusinessLayer\ArtistBusinessLayer;
use \OCA\Music\BusinessLayer\GenreBusinessLayer;
use \OCA\Music\BusinessLayer\Library;
use \OCA\Music\BusinessLayer\PlaylistBusinessLayer;
use \OCA\Music\BusinessLayer\TrackBusinessLayer;

use \OCA\Music\Db\AmpacheUserMapper;
use \OCA\Music\Db\AmpacheSession;
use \OCA\Music\Db\AmpacheSessionMapper;
use \OCA\Music\Db\SortBy;

use \OCA\Music\Http\ErrorResponse;
use \OCA\Music\Http\FileResponse;
use \OCA\Music\Http\XMLResponse;

use \OCA\Music\Utility\AmpacheUser;
use \OCA\Music\Utility\CoverHelper;
use \OCA\Music\Utility\Util;

class AmpacheController extends Controller {
	private $ampacheUserMapper;
	private $ampacheSessionMapper;
	private $albumBusinessLayer;
	private $artistBusinessLayer;
	private $genreBusinessLayer;
	private $playlistBusinessLayer;
	private $trackBusinessLayer;
	private $library;
	private $ampacheUser;
	private $urlGenerator;
	private $rootFolder;
	private $l10n;
	private $coverHelper;
	private $logger;
	private $jsonMode;

	const SESSION_EXPIRY_TIME = 6000;
	const ALL_TRACKS_PLAYLIST_ID = 10000000;
	const API_VERSION = 350001;

	public function __construct($appname,
								IRequest $request,
								$l10n,
								IURLGenerator $urlGenerator,
								AmpacheUserMapper $ampacheUserMapper,
								AmpacheSessionMapper $ampacheSessionMapper,
								AlbumBusinessLayer $albumBusinessLayer,
								ArtistBusinessLayer $artistBusinessLayer,
								GenreBusinessLayer $genreBusinessLayer,
								PlaylistBusinessLayer $playlistBusinessLayer,
								TrackBusinessLayer $trackBusinessLayer,
								Library $library,
								AmpacheUser $ampacheUser,
								$rootFolder,
								CoverHelper $coverHelper,
								Logger $logger) {
		parent::__construct($appname, $request);

		$this->ampacheUserMapper = $ampacheUserMapper;
		$this->ampacheSessionMapper = $ampacheSessionMapper;
		$this->albumBusinessLayer = $albumBusinessLayer;
		$this->artistBusinessLayer = $artistBusinessLayer;
		$this->genreBusinessLayer = $genreBusinessLayer;
		$this->playlistBusinessLayer = $playlistBusinessLayer;
		$this->trackBusinessLayer = $trackBusinessLayer;
		$this->library = $library;
		$this->urlGenerator = $urlGenerator;
		$this->l10n = $l10n;

		// used to share user info with middleware
		$this->ampacheUser = $ampacheUser;

		// used to deliver actual media file
		$this->rootFolder = $rootFolder;

		$this->coverHelper = $coverHelper;
		$this->logger = $logger;
	}

	public function setJsonMode($useJsonMode) {
		$this->jsonMode = $useJsonMode;
	}

	public function ampacheResponse($content) {
		if ($this->jsonMode) {
			return new JSONResponse($content);
		} else {
			return new XMLResponse(['root' => $content], ['id', 'count']);
		}
	}

	/**
	 * @NoAdminRequired
	 * @PublicPage
	 * @NoCSRFRequired
	 */
	public function xmlApi($action, $user, $timestamp, $auth, $filter, $exact, $limit, $offset) {
		// differentation between xmlApi and jsonApi is made already by the middleware
		return $this->dispatch($action, $user, $timestamp, $auth, $filter, $exact, $limit, $offset);
	}

	/**
	 * @NoAdminRequired
	 * @PublicPage
	 * @NoCSRFRequired
	 */
	public function jsonApi($action, $user, $timestamp, $auth, $filter, $exact, $limit, $offset) {
		// differentation between xmlApi and jsonApi is made already by the middleware
		return $this->dispatch($action, $user, $timestamp, $auth, $filter, $exact, $limit, $offset);
	}

	protected function dispatch($action, $user, $timestamp, $auth, $filter, $exact, $limit, $offset) {
		$this->logger->log("Ampache action '$action' requested", 'debug');

		$limit = self::validateLimitOrOffset($limit);
		$offset = self::validateLimitOrOffset($offset);

		switch ($action) {
			case 'handshake':
				return $this->handshake($user, $timestamp, $auth);
			case 'ping':
				return $this->ping($auth);
			case 'artists':
				return $this->artists($filter, $exact, $limit, $offset);
			case 'artist':
				return $this->artist($filter);
			case 'artist_albums':
				return $this->artist_albums($filter, $auth);
			case 'album_songs':
				return $this->album_songs($filter, $auth);
			case 'albums':
				return $this->albums($filter, $exact, $limit, $offset, $auth);
			case 'album':
				return $this->album($filter, $auth);
			case 'artist_songs':
				return $this->artist_songs($filter, $auth);
			case 'songs':
				return $this->songs($filter, $exact, $limit, $offset, $auth);
			case 'song':
				return $this->song($filter, $auth);
			case 'search_songs':
				return $this->search_songs($filter, $auth);
			case 'playlists':
				return $this->playlists($filter, $exact, $limit, $offset);
			case 'playlist':
				return $this->playlist($filter);
			case 'playlist_songs':
				return $this->playlist_songs($filter, $limit, $offset, $auth);
			case 'tags':
				return $this->tags($filter, $exact, $limit, $offset);
			case 'tag':
				return $this->tag($filter);
			case 'tag_artists':
				return $this->tag_artists($filter, $limit, $offset);
			case 'tag_albums':
				return $this->tag_albums($filter, $limit, $offset, $auth);
			case 'tag_songs':
				return $this->tag_songs($filter, $limit, $offset, $auth);
			# non Ampache API action - used for provide the file
			case 'play':
				return $this->play($filter);
			case '_get_cover':
				return $this->get_cover($filter);
		}

		$this->logger->log("Unsupported Ampache action '$action' requested", 'warn');
		throw new AmpacheException('Action not supported', 405);
	}

	/***********************
	 * Ampahce API methods *
	 ***********************/

	protected function handshake($user, $timestamp, $auth) {
		$currentTime = \time();
		$expiryDate = $currentTime + self::SESSION_EXPIRY_TIME;

		$this->checkHandshakeTimestamp($timestamp, $currentTime);
		$this->checkHandshakeAuthentication($user, $timestamp, $auth);
		$token = $this->startNewSession($user, $expiryDate);

		$currentTimeFormated = \date('c', $currentTime);
		$expiryDateFormated = \date('c', $expiryDate);

		return $this->ampacheResponse([
			'auth' => $token,
			'version' => self::API_VERSION,
			'update' => $currentTimeFormated,
			'add' => $currentTimeFormated,
			'clean' => $currentTimeFormated,
			'songs' => $this->trackBusinessLayer->count($user),
			'artists' => $this->artistBusinessLayer->count($user),
			'albums' => $this->albumBusinessLayer->count($user),
			'playlists' => $this->playlistBusinessLayer->count($user) + 1, // +1 for "All tracks"
			'session_expire' => $expiryDateFormated,
			'tags' => $this->genreBusinessLayer->count($user),
			'videos' => 0
		]);
	}

	protected function ping($auth) {
		if ($auth !== null && $auth !== '') {
			$this->ampacheSessionMapper->extend($auth, \time() + self::SESSION_EXPIRY_TIME);
		}

		return $this->ampacheResponse([
			'version' => self::API_VERSION
		]);
	}

	protected function artists($filter, $exact, $limit, $offset) {
		$artists = $this->findEntities($this->artistBusinessLayer, $filter, $exact, $limit, $offset);
		return $this->renderArtists($artists);
	}

	protected function artist($artistId) {
		$userId = $this->ampacheUser->getUserId();
		$artist = $this->artistBusinessLayer->find($artistId, $userId);
		return $this->renderArtists([$artist]);
	}

	protected function artist_albums($artistId, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$albums = $this->albumBusinessLayer->findAllByArtist($artistId, $userId);
		return $this->renderAlbums($albums, $auth);
	}

	protected function artist_songs($artistId, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$artist = $this->artistBusinessLayer->find($artistId, $userId);
		$tracks = $this->trackBusinessLayer->findAllByArtist($artistId, $userId);
		$this->injectArtistAndAlbum($tracks, $artist);
		return $this->renderSongs($tracks, $auth);
	}

	protected function album_songs($albumId, $auth) {
		$userId = $this->ampacheUser->getUserId();

		$album = $this->albumBusinessLayer->find($albumId, $userId);
		$album->setAlbumArtist($this->artistBusinessLayer->find($album->getAlbumArtistId(), $userId));

		$tracks = $this->trackBusinessLayer->findAllByAlbum($albumId, $userId);
		$this->injectArtistAndAlbum($tracks, null, $album);

		return $this->renderSongs($tracks, $auth);
	}

	protected function song($trackId, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$track = $this->trackBusinessLayer->find($trackId, $userId);
		$trackInArray = [$track];
		$this->injectArtistAndAlbum($trackInArray);
		return $this->renderSongs($trackInArray, $auth);
	}

	protected function songs($filter, $exact, $limit, $offset, $auth) {

		// optimized handling for fetching the whole library
		// note: the ordering of the songs differs between these two cases
		if (empty($filter) && !$limit && !$offset) {
			$tracks = $this->getAllTracks();
		}
		// general case
		else {
			$tracks = $this->findEntities($this->trackBusinessLayer, $filter, $exact, $limit, $offset);
			$this->injectArtistAndAlbum($tracks);
		}

		return $this->renderSongs($tracks, $auth);
	}

	protected function search_songs($filter, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$tracks = $this->trackBusinessLayer->findAllByNameRecursive($filter, $userId);
		$this->injectArtistAndAlbum($tracks);
		return $this->renderSongs($tracks, $auth);
	}

	protected function albums($filter, $exact, $limit, $offset, $auth) {
		$albums = $this->findEntities($this->albumBusinessLayer, $filter, $exact, $limit, $offset);
		return $this->renderAlbums($albums, $auth);
	}

	protected function album($albumId, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$album = $this->albumBusinessLayer->find($albumId, $userId);
		return $this->renderAlbums([$album], $auth);
	}

	protected function playlists($filter, $exact, $limit, $offset) {
		$userId = $this->ampacheUser->getUserId();
		$playlists = $this->findEntities($this->playlistBusinessLayer, $filter, $exact, $limit, $offset);

		// append "All tracks" if not searching by name, and it is not off-limit
		if (empty($filter) && ($limit === null || \count($playlists) < $limit)) {
			$playlists[] = new AmpacheController_AllTracksPlaylist($userId, $this->trackBusinessLayer, $this->l10n);
		}

		return $this->renderPlaylists($playlists);
	}

	protected function playlist($listId) {
		$userId = $this->ampacheUser->getUserId();
		if ($listId == self::ALL_TRACKS_PLAYLIST_ID) {
			$playlist = new AmpacheController_AllTracksPlaylist($userId, $this->trackBusinessLayer, $this->l10n);
		} else {
			$playlist = $this->playlistBusinessLayer->find($listId, $userId);
		}
		return $this->renderPlaylists([$playlist]);
	}

	protected function playlist_songs($listId, $limit, $offset, $auth) {
		if ($listId == self::ALL_TRACKS_PLAYLIST_ID) {
			$playlistTracks = $this->getAllTracks();
			$playlistTracks = \array_slice($playlistTracks, $offset, $limit);
		}
		else {
			$userId = $this->ampacheUser->getUserId();
			$playlistTracks = $this->playlistBusinessLayer->getPlaylistTracks($listId, $userId, $limit, $offset);
			$this->injectArtistAndAlbum($playlistTracks);
		}
		return $this->renderSongs($playlistTracks, $auth);
	}

	protected function tags($filter, $exact, $limit, $offset) {
		$userId = $this->ampacheUser->getUserId();
		// TODO: $filter, $exact
		$genres = $this->genreBusinessLayer->findAllWithCounts($userId, $limit, $offset);
		return $this->renderTags($genres);
	}

	protected function tag($tagId) {
		$userId = $this->ampacheUser->getUserId();
		$genre = $this->genreBusinessLayer->find($tagId, $userId);
		return $this->renderTags([$genre]);
	}

	protected function tag_artists($genreId, $limit, $offset) {
		$userId = $this->ampacheUser->getUserId();
		$artists = $this->artistBusinessLayer->findAllByGenre($genreId, $userId, $limit, $offset);
		return $this->renderArtists($artists);
	}

	protected function tag_albums($genreId, $limit, $offset, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$albums = $this->albumBusinessLayer->findAllByGenre($genreId, $userId, $limit, $offset);
		return $this->renderAlbums($albums, $auth);
	}

	protected function tag_songs($genreId, $limit, $offset, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$tracks = $this->trackBusinessLayer->findAllByGenre($genreId, $userId, $limit, $offset);
		$this->injectArtistAndAlbum($tracks, $artist);

		return $this->renderSongs($tracks, $auth);
	}

	protected function play($trackId) {
		$userId = $this->ampacheUser->getUserId();

		try {
			$track = $this->trackBusinessLayer->find($trackId, $userId);
		} catch (BusinessLayerException $e) {
			return new ErrorResponse(Http::STATUS_NOT_FOUND, $e->getMessage());
filter:
    dependency_paths: ["lib/*"]
		}

		$files = $this->rootFolder->getUserFolder($userId)->getById($track->getFileId());

		if (\count($files) === 1) {
			return new FileResponse($files[0]);
		} else {
			return new ErrorResponse(Http::STATUS_NOT_FOUND);
		}
	}

	/* this is not ampache proto */
	protected function get_cover($albumId) {
		$userId = $this->ampacheUser->getUserId();
		$userFolder = $this->rootFolder->getUserFolder($userId);

		try {
			$coverData = $this->coverHelper->getCover($albumId, $userId, $userFolder);
			if ($coverData !== null) {
				return new FileResponse($coverData);
			}
		} catch (BusinessLayerException $e) {
			return new ErrorResponse(Http::STATUS_NOT_FOUND, 'album not found');
		}

		return new ErrorResponse(Http::STATUS_NOT_FOUND, 'album has no cover');
	}


	/********************
	 * Helper functions *
	 ********************/

	private function checkHandshakeTimestamp($timestamp, $currentTime) {
		$providedTime = \intval($timestamp);

		if ($providedTime === 0) {
			throw new AmpacheException('Invalid Login - cannot parse time', 401);
		}
		if ($providedTime < ($currentTime - self::SESSION_EXPIRY_TIME)) {
			throw new AmpacheException('Invalid Login - session is outdated', 401);
		}
		// Allow the timestamp to be at maximum 10 minutes in the future. The client may use its
		// own system clock to generate the timestamp and that may differ from the server's time.
		if ($providedTime > $currentTime + 600) {
			throw new AmpacheException('Invalid Login - timestamp is in future', 401);
		}
	}

	private function checkHandshakeAuthentication($user, $timestamp, $auth) {
		$hashes = $this->ampacheUserMapper->getPasswordHashes($user);

		foreach ($hashes as $hash) {
			$expectedHash = \hash('sha256', $timestamp . $hash);

			if ($expectedHash === $auth) {
				return;
			}
		}

		throw new AmpacheException('Invalid Login - passphrase does not match', 401);
	}

	private function startNewSession($user, $expiryDate) {
		// this can cause collision, but it's just a temporary token
		$token = \md5(\uniqid(\rand(), true));

		// create new session
		$session = new AmpacheSession();
		$session->setUserId($user);
		$session->setToken($token);
		$session->setExpiry($expiryDate);

		// save session
		$this->ampacheSessionMapper->insert($session);

		return $token;
	}

	private function findEntities(BusinessLayer $businessLayer, $filter, $exact, $limit=null, $offset=null) {
		$userId = $this->ampacheUser->getUserId();

		if ($filter) {
			$fuzzy = !((boolean) $exact);
			return $businessLayer->findAllByName($filter, $userId, $fuzzy, $limit, $offset);
		} else {
			return $businessLayer->findAll($userId, SortBy::Name, $limit, $offset);
		}
	}

	/**
	 * Getting all tracks with this helper is more efficient than with `findEntities`
	 * followed by `injectArtistAndAlbum`. This is because, under the hood, the albums
	 * and artists are fetched with a single DB query instead of fetching each separately.
	 * 
	 * The result set is ordered first by artist and then by song title.
	 */
	private function getAllTracks() {
		$userId = $this->ampacheUser->getUserId();
		$tracks = $this->library->getTracksAlbumsAndArtists($userId)['tracks'];
		\usort($tracks, ['\OCA\Music\Db\Track', 'compareArtistAndTitle']);
		foreach ($tracks as $index => &$track) {
			$track->setNumberOnPlaylist($index + 1);
		}
		return $tracks;
	}

	private function createAmpacheActionUrl($action, $filter, $auth) {
		$api = $this->jsonMode ? 'music.ampache.jsonApi' : 'music.ampache.xmlApi';
		return $this->urlGenerator->getAbsoluteURL($this->urlGenerator->linkToRoute($api))
				. "?action=$action&filter=$filter&auth=$auth";
	}

	private function createAlbumCoverUrl($album, $auth) {
		if ($album->getCoverFileId()) {
			return $this->createAmpacheActionUrl('_get_cover', $album->getId(), $auth);
		} else {
			return '';
		}
	}

	/**
	 * Any non-integer values and integer value 0 are converted to null to
	 * indicate "no limit" or "no offset".
	 * @param string $value
	 * @return integer|null
	 */
	private static function validateLimitOrOffset($value) {
		if (\ctype_digit(\strval($value)) && $value !== 0) {
			return \intval($value);
		} else {
			return null;
		}
	}

	private function renderArtists($artists) {
		$userId = $this->ampacheUser->getUserId();
		$genreMap = Util::createIdLookupTable($this->genreBusinessLayer->findAll($userId));

		return $this->ampacheResponse([
			'total_count' => \count($artists),
			'artist' => \array_map(function($artist) use ($userId, $genreMap) {
				return [
					'id' => $artist->getId(),
					'name' => $artist->getNameString($this->l10n),
					'albums' => $this->albumBusinessLayer->countByArtist($artist->getId()),
					'songs' => $this->trackBusinessLayer->countByArtist($artist->getId()),
					'rating' => 0,
					'preciserating' => 0,
					'tag' => \array_map(function($genreId) use ($genreMap) {
						return [
							'id' => $genreId,
							'value' => $genreMap[$genreId]->getNameString($this->l10n),
							'count' => 1
						];
					}, $this->trackBusinessLayer->getGenresByArtistId($artist->getId(), $userId))
				];
			}, $artists)
		]);
	}

	private function renderAlbums($albums, $auth) {
		$userId = $this->ampacheUser->getUserId();

		$genreMap = Util::createIdLookupTable($this->genreBusinessLayer->findAll($userId));

		return $this->ampacheResponse([
			'total_count' => \count($albums),
			'album' => \array_map(function($album) use ($userId, $auth, $genreMap) {
				$artist = $this->artistBusinessLayer->find($album->getAlbumArtistId(), $userId);
				return [
					'id' => $album->getId(),
					'name' => $album->getNameString($this->l10n),
					'artist' => [
						'id' => $artist->getId(),
						'value' => $artist->getNameString($this->l10n)
					],
					'tracks' => $this->trackBusinessLayer->countByAlbum($album->getId()),
					'rating' => 0,
					'year' => $album->yearToAPI(),
					'art' => $this->createAlbumCoverUrl($album, $auth),
					'preciserating' => 0,
					'tag' => \array_map(function($genreId) use ($genreMap) {
						return [
							'id' => $genreId,
							'value' => $genreMap[$genreId]->getNameString($this->l10n),
							'count' => 1
						];
					}, $album->getGenres())
				];
			}, $albums)
		]);
	}

	private function injectArtistAndAlbum(&$tracks, $commonArtist=null, $commonAlbum=null) {
		$userId = $this->ampacheUser->getUserId();

		foreach ($tracks as &$track) {
			$artist = $commonArtist ?: $this->artistBusinessLayer->find($track->getArtistId(), $userId);
			$track->setArtist($artist);

			if (!empty($commonAlbum)) {
				$track->setAlbum($commonAlbum);
			} else {
				$album = $this->albumBusinessLayer->find($track->getAlbumId(), $userId);
				$album->setAlbumArtist($this->artistBusinessLayer->find($album->getAlbumArtistId(), $userId));
				$track->setAlbum($album);
			}
		}
	}

	private function renderSongs($tracks, $auth) {
		$userId = $this->ampacheUser->getUserId();
		$genreMap = Util::createIdLookupTable($this->genreBusinessLayer->findAll($userId));

		return $this->ampacheResponse([
			'total_count' => \count($tracks),
			'song' => \array_map(function($track) use ($auth, $genreMap) {
				$artist = $track->getArtist();
				$album = $track->getAlbum();
				$albumArtist = $album->getAlbumArtist();

				$result = [
					'id' => $track->getId(),
					'title' => $track->getTitle(),
					'artist' => [
						'id' => $artist->getId(),
						'value' => $artist->getNameString($this->l10n)
					],
					'albumartist' => [
						'id' => $albumArtist->getId(),
						'value' => $albumArtist->getNameString($this->l10n)
					],
					'album' => [
						'id' => $album->getId(),
						'value' => $album->getNameString($this->l10n)
					],
					'url' => $this->createAmpacheActionUrl('play', $track->getId(), $auth),
					'time' => $track->getLength(),
					'year' => $track->getYear(),
					'track' => $track->getAdjustedTrackNumber(),
					'bitrate' => $track->getBitrate(),
					'mime' => $track->getMimetype(),
					'size' => $track->getSize(),
					'art' => $this->createAlbumCoverUrl($album, $auth),
					'rating' => 0,
					'preciserating' => 0,
				];

				$genreId = $track->getGenreId();
				if ($genreId !== null) {
					$result['tag'] = [
						'id' => $genreId,
						'value' => $genreMap[$genreId]->getNameString($this->l10n),
						'count' => 1
					];
				}
				return $result;
			}, $tracks)
		]);
	}

	private function renderPlaylists($playlists) {
		return $this->ampacheResponse([
			'total_count' => [\count($playlists)],
			'playlist' => \array_map(function($playlist) {
				return [
					'id' => $playlist->getId(),
					'name' => $playlist->getName(),
					'owner' => $this->ampacheUser->getUserId(),
					'items' => $playlist->getTrackCount(),
					'type' => 'Private'
				];
			}, $playlists)
		]);
	}

	private function renderTags($genres) {
		return $this->ampacheResponse([
			'total_count' => [\count($genres)],
			'tag' => \array_map(function($genre) {
				return [
					'id' => $genre->getId(),
					'name' => $genre->getNameString($this->l10n),
					'albums' => $genre->getAlbumCount(),
					'artists' => $genre->getArtistCount(),
					'songs' => $genre->getTrackCount(),
					'videos' => 0,
					'playlists' => 0,
					'stream' => 0
				];
			}, $genres)
		]);
	}

}

/**
 * Adapter class which acts like the Playlist class for the purpose of 
 * AmpacheController::renderPlaylists but contains all the track of the user. 
 */
class AmpacheController_AllTracksPlaylist {

	private $user;
	private $trackBusinessLayer;
	private $l10n;

	public function __construct($user, $trackBusinessLayer, $l10n) {
		$this->user = $user;
		$this->trackBusinessLayer = $trackBusinessLayer;
		$this->l10n = $l10n;
	}

	public function getId() {
		return AmpacheController::ALL_TRACKS_PLAYLIST_ID;
	}

	public function getName() {
		return $this->l10n->t('All tracks');
	}

	public function getTrackCount() {
		return $this->trackBusinessLayer->count($this->user);
	}
}

owncloud / music

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AmpacheController::playlist_songs() A

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