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Given a Spotify playlist URL, prints out a track listing.
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| import java.io.*; | |
| import java.net.*; | |
| import java.net.http.*; | |
| import java.nio.charset.*; | |
| import java.util.*; | |
| import java.util.concurrent.CompletableFuture; | |
| import javax.swing.text.html.parser.*; | |
| import javax.swing.text.html.*; | |
| import javax.swing.text.*; | |
| /** | |
| * The playlist contains meta tags with name attributes of "music:song", each is a URL | |
| * to a song page where the meta og:title is the track title and music:musician_description contains | |
| * the artist | |
| */ | |
| public class SpotLister | |
| { | |
| private Map <URI, String[]> tracks = new LinkedHashMap <> (); | |
| static int TITLE = 0, ARTIST = 1; | |
| static HttpClient client = HttpClient.newHttpClient(); | |
| public SpotLister(URI uri, PrintStream out) | |
| { | |
| try | |
| { | |
| var req = HttpRequest.newBuilder(uri).build(); | |
| var res = HttpResponse.BodyHandlers.ofInputStream(); | |
| delegate(client.send(req, res)); | |
| List <HttpRequest> requests = tracks.keySet().stream() | |
| .map(HttpRequest::newBuilder) | |
| .map(HttpRequest.Builder::build) | |
| .toList(); | |
| CompletableFuture.allOf(requests.stream() | |
| .map(request -> client.sendAsync(request, HttpResponse.BodyHandlers.ofInputStream()) | |
| .thenAccept(response -> tracks.replace(response.request().uri(), delegate(response)))) | |
| .toArray(CompletableFuture<?>[]::new)) | |
| .join(); | |
| } | |
| catch (IOException ex) | |
| { | |
| throw new UncheckedIOException(ex); | |
| } | |
| catch (InterruptedException ex) | |
| { | |
| Thread.currentThread().interrupt(); | |
| throw new RuntimeException(ex); | |
| } | |
| var it = tracks.values().iterator(); | |
| for (var i = 0 ; it.hasNext() ; i++) | |
| { | |
| String[] track = it.next(); | |
| out.format("%d. %s / %s%n", i+1, track[TITLE], track[ARTIST]); | |
| } | |
| } | |
| class Delegate extends HTMLEditorKit.ParserCallback | |
| { | |
| private String[] track = new String[2]; | |
| @Override | |
| public void handleSimpleTag(HTML.Tag t, MutableAttributeSet s, int pos) | |
| { | |
| if (!(t.equals(HTML.Tag.META) && s.isDefined(HTML.Attribute.CONTENT))) return; | |
| var content = s.getAttribute(HTML.Attribute.CONTENT).toString(); | |
| switch (String.valueOf(s.getAttribute(HTML.Attribute.NAME))) | |
| { | |
| case "music:song": | |
| tracks.put(URI.create(content), track); | |
| return; | |
| case "music:musician_description": | |
| track[ARTIST] = content; | |
| return; | |
| } | |
| var property = String.valueOf(s.getAttribute("property")); | |
| if ("og:title".equals(property)) track[TITLE] = content; | |
| } | |
| } | |
| String[] delegate(HttpResponse <InputStream> res) | |
| { | |
| var delegate = new Delegate(); | |
| try | |
| { | |
| new ParserDelegator().parse(new InputStreamReader(res.body(), StandardCharsets.UTF_8), delegate, true); | |
| } | |
| catch (IOException ex) | |
| { | |
| throw new UncheckedIOException(ex); | |
| } | |
| return delegate.track; | |
| } | |
| public static void main(String[] args) | |
| { | |
| try | |
| { | |
| Arrays.stream(args).map(URI::create).forEach(uri -> new SpotLister(uri, System.out)); | |
| } | |
| catch (Exception ex) | |
| { | |
| System.err.format("Request failed due to '%s'%n", ex.getMessage()); | |
| } | |
| } | |
| } |
Rewritten for new Spotify, July 2023
Updated, October 2023.
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Updated for latest Spotify html output, Dec 2022