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<?php |
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namespace App\Services; |
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use App\Models\Album; |
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use App\Models\Artist; |
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use App\Models\Playlist; |
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use App\Models\Song; |
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use App\Models\SongZipArchive; |
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use Illuminate\Database\Eloquent\Collection; |
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use InvalidArgumentException; |
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class DownloadService |
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{ |
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private $s3Service; |
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public function __construct(S3Service $s3Service) |
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{ |
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$this->s3Service = $s3Service; |
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} |
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/** |
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* Generic method to generate a download archive from various source types. |
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* |
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* @param Song|Collection|Album|Artist|Playlist $mixed |
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* |
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* @throws InvalidArgumentException |
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* |
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* @return string Full path to the generated archive |
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*/ |
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public function from($mixed): string |
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{ |
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switch (get_class($mixed)) { |
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case Song::class: |
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return $this->fromSong($mixed); |
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case Collection::class: |
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return $this->fromMultipleSongs($mixed); |
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case Album::class: |
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return $this->fromAlbum($mixed); |
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case Artist::class: |
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return $this->fromArtist($mixed); |
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case Playlist::class: |
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return $this->fromPlaylist($mixed); |
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} |
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throw new InvalidArgumentException('Unsupported download type.'); |
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} |
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public function fromSong(Song $song): string |
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{ |
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if ($s3Params = $song->s3_params) { |
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// The song is hosted on Amazon S3. |
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// We download it back to our local server first. |
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$url = $this->s3Service->getSongPublicUrl($song); |
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abort_unless($url, 404); |
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$localPath = sys_get_temp_dir().DIRECTORY_SEPARATOR.basename($s3Params['key']); |
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// The following function requires allow_url_fopen to be ON. |
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// We're just assuming that to be the case here. |
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copy($url, $localPath); |
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} else { |
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// The song is hosted locally. Make sure the file exists. |
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$localPath = $song->path; |
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abort_unless(file_exists($localPath), 404); |
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} |
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return $localPath; |
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} |
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protected function fromMultipleSongs(Collection $songs): string |
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{ |
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if ($songs->count() === 1) { |
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return $this->fromSong($songs->first()); |
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} |
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return (new SongZipArchive()) |
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->addSongs($songs) |
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->finish() |
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->getPath(); |
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} |
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protected function fromPlaylist(Playlist $playlist): string |
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{ |
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return $this->fromMultipleSongs($playlist->songs); |
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} |
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protected function fromAlbum(Album $album): string |
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{ |
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return $this->fromMultipleSongs($album->songs); |
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} |
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protected function fromArtist(Artist $artist): string |
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{ |
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return $this->fromMultipleSongs($artist->songs); |
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} |
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} |
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