[YouTube] only apply course-playlists fallback for courses

Author: FineFindus

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubePlaylistExtractor.java

@@ -31,6 +31,7 @@
 import org.schabi.newpipe.extractor.stream.Description;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
+import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Utils;
 
 import java.io.IOException;
@@ -61,6 +62,7 @@ public class YoutubePlaylistExtractor extends PlaylistExtractor {
     private JsonObject playlistHeader;
 
     private boolean isNewPlaylistInterface;
+    private Boolean isCoursePlaylist = null;
 
     public YoutubePlaylistExtractor(final StreamingService service,
                                     final ListLinkHandler linkHandler) {
@@ -175,6 +177,31 @@ private JsonObject getPlaylistHeader() {
         return playlistHeader;
     }
 
+    private Boolean isCoursePlaylist() {
+        if (isCoursePlaylist == null) {
+            try {
+                isCoursePlaylist = JsonUtils.getArray(getPlaylistHeader(),
+                    "onDescriptionTap.commandExecutorCommand.commands")
+                .stream()
+                .filter(JsonObject.class::isInstance)
+                .map(JsonObject.class::cast)
+                .anyMatch(object -> {
+                    try {
+                        final String tag = JsonUtils.getString(object,
+                            "showEngagementPanelEndpoint.identifier.tag");
+                        return tag.equals("engagement-panel-course-metadata");
+                    } catch (final ParsingException e) {
+                        return false;
+                    }
+                });
+                System.out.println(isCoursePlaylist);
+            } catch (final Exception e) {
+                isCoursePlaylist = false;
+            }
+        }
+        return isCoursePlaylist;
+    }
+
     @Nonnull
     @Override
     public String getName() throws ParsingException {
@@ -420,30 +447,28 @@ private Page getNextPageFrom(final JsonArray contents)
     private void collectStreamsFrom(@Nonnull final StreamInfoItemsCollector collector,
                                     @Nonnull final JsonArray videos) {
         final TimeAgoParser timeAgoParser = getTimeAgoParser();
+        final PlaylistExtractor playlistExtractor = this;
         videos.stream()
                 .filter(JsonObject.class::isInstance)
                 .map(JsonObject.class::cast)
                 .forEach(video -> {
                     if (video.has(PLAYLIST_VIDEO_RENDERER)) {
-                        final PlaylistExtractor playlistExtractor = this;
                         collector.commit(new YoutubeStreamInfoItemExtractor(
                             video.getObject(PLAYLIST_VIDEO_RENDERER), timeAgoParser) {
                                 @Override
                                 public String getUploaderName() throws ParsingException {
-                                    try {
-                                        return super.getUploaderName();
-                                    } catch (final ParsingException e) {
+                                    if (isCoursePlaylist()) {
                                         return playlistExtractor.getUploaderName();
                                     }
+                                    return super.getUploaderName();
                                 }
 
                                 @Override
                                 public String getUploaderUrl() throws ParsingException {
-                                    try {
-                                        return super.getUploaderUrl();
-                                    } catch (final ParsingException e) {
+                                    if (isCoursePlaylist()) {
                                         return playlistExtractor.getUploaderUrl();
                                     }
+                                    return super.getUploaderUrl();
                                 }
                             });
                     } else if (video.has(RICH_ITEM_RENDERER)) {