[Bandcamp] Handle paywalled tracks

Author: petlyh

extractor/src/main/java/org/schabi/newpipe/extractor/services/bandcamp/extractors/BandcampStreamExtractor.java

@@ -15,6 +15,7 @@
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.exceptions.PaidContentException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.linkhandler.LinkHandler;
 import org.schabi.newpipe.extractor.localization.DateWrapper;
@@ -57,6 +58,10 @@ public void onFetchPage(@Nonnull final Downloader downloader)
             // In this case, we are actually viewing an album page!
             throw new ExtractionException("Page is actually an album, not a track");
         }
+
+        if (albumJson.getArray("trackinfo").getObject(0).isNull("file")) {
+            throw new PaidContentException("This track is not available without being purchased");
+        }
     }
 
     /**

extractor/src/test/java/org/schabi/newpipe/extractor/services/bandcamp/BandcampPaidStreamExtractorTest.java

@@ -0,0 +1,25 @@
+package org.schabi.newpipe.extractor.services.bandcamp;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.schabi.newpipe.extractor.ServiceList.Bandcamp;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.schabi.newpipe.downloader.DownloaderTestImpl;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.exceptions.PaidContentException;
+
+public class BandcampPaidStreamExtractorTest {
+
+    @BeforeAll
+    public static void setUp() {
+        NewPipe.init(DownloaderTestImpl.getInstance());
+    }
+
+    @Test
+    public void testPaidTrack() throws ExtractionException {
+        final var extractor = Bandcamp.getStreamExtractor("https://radicaldreamland.bandcamp.com/track/hackmud-continuous-mix");
+        assertThrows(PaidContentException.class, extractor::fetchPage);
+    }
+}