Add GeographicRestrictionException and SoundCloudGoPlusException in NewPipe Extractor to be able to display different error messages

This commit adds two new exceptions in NewPipe Extractor: GeographicRestrictionException and SoundCloudGoPlusException (which extend to ContentNotAvailableException). These exceptions allow showing different error messages to user when a content isn't available in his/her/its country (only used for now by SoundCloudStreamExtractor) or when the content is a SoundCloud Go+ track.

Author: AudricV

extractor/src/main/java/org/schabi/newpipe/extractor/exceptions/GeographicRestrictionException.java

@@ -0,0 +1,11 @@
+package org.schabi.newpipe.extractor.exceptions;
+
+public class GeographicRestrictionException extends ContentNotAvailableException {
+    public GeographicRestrictionException(String message) {
+        super(message);
+    }
+
+    public GeographicRestrictionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

extractor/src/main/java/org/schabi/newpipe/extractor/exceptions/SoundCloudGoPlusException.java

@@ -0,0 +1,11 @@
+package org.schabi.newpipe.extractor.exceptions;
+
+public class SoundCloudGoPlusException extends ContentNotAvailableException {
+    public SoundCloudGoPlusException() {
+        super("This track is a SoundCloud Go+ track");
+    }
+
+    public SoundCloudGoPlusException(Throwable cause) {
+        super("This track is a SoundCloud Go+ track", cause);
+    }
+}

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudStreamExtractor.java

@@ -12,7 +12,9 @@
 import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException;
 import org.schabi.newpipe.extractor.exceptions.ContentNotSupportedException;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.exceptions.GeographicRestrictionException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
+import org.schabi.newpipe.extractor.exceptions.SoundCloudGoPlusException;
 import org.schabi.newpipe.extractor.linkhandler.LinkHandler;
 import org.schabi.newpipe.extractor.localization.DateWrapper;
 import org.schabi.newpipe.extractor.services.soundcloud.SoundcloudParsingHelper;
@@ -43,6 +45,12 @@ public void onFetchPage(@Nonnull Downloader downloader) throws IOException, Extr
 
         String policy = track.getString("policy", EMPTY_STRING);
         if (!policy.equals("ALLOW") && !policy.equals("MONETIZE")) {
+            if (policy.equals("SNIP")) {
+                throw new SoundCloudGoPlusException();
+            }
+            if (policy.equals("BLOCK")) {
+                throw new GeographicRestrictionException("This track is not available in user's country");
+            }
             throw new ContentNotAvailableException("Content not available: policy " + policy);
         }
     }