MediaCCCLH: use substring instead of replace; improve a bit tests, return Collections.emptyList(); instead of null where it's annotated @NonNull

extractor/src/main/java/org/schabi/newpipe/extractor/services/media_ccc/extractors/MediaCCCStreamExtractor.java

@@ -16,6 +16,7 @@ import org.schabi.newpipe.extractor.stream.*;
 import javax.annotation.Nonnull;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 
@@ -104,13 +105,13 @@ public class MediaCCCStreamExtractor extends StreamExtractor {
     @Nonnull
     @Override
     public String getDashMpdUrl() throws ParsingException {
-        return null;
+        return "";
     }
 
     @Nonnull
     @Override
     public String getHlsUrl() throws ParsingException {
-        return null;
+        return "";
     }
 
     @Override
@@ -170,14 +171,16 @@ public class MediaCCCStreamExtractor extends StreamExtractor {
         return null;
     }
 
+    @Nonnull
     @Override
     public List<SubtitlesStream> getSubtitlesDefault() throws IOException, ExtractionException {
-        return null;
+        return Collections.emptyList();
     }
 
+    @Nonnull
     @Override
     public List<SubtitlesStream> getSubtitles(final MediaFormat format) throws IOException, ExtractionException {
-        return null;
+        return Collections.emptyList();
     }
 
     @Override

extractor/src/main/java/org/schabi/newpipe/extractor/services/media_ccc/linkHandler/MediaCCCStreamLinkHandlerFactory.java

@@ -14,7 +14,7 @@ public class MediaCCCStreamLinkHandlerFactory extends LinkHandlerFactory {
     public String getId(String urlString) throws ParsingException {
         if (urlString.startsWith("https://api.media.ccc.de/public/events/") &&
                 !urlString.contains("?q=")) {
-            return urlString.replace("https://api.media.ccc.de/public/events/", "");
+            return urlString.substring(39); //remove api…/public/events part
         }
 
         URL url;

extractor/src/test/java/org/schabi/newpipe/extractor/services/media_ccc/MediaCCCStreamExtractorTest.java

@@ -7,6 +7,7 @@ import org.schabi.newpipe.DownloaderTestImpl;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.services.media_ccc.extractors.MediaCCCStreamExtractor;
+import org.schabi.newpipe.extractor.utils.UtilsTest;
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
@@ -14,6 +15,7 @@ import java.util.Calendar;
 
 import static java.util.Objects.requireNonNull;
 import static junit.framework.TestCase.assertEquals;
+import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
 import static org.schabi.newpipe.extractor.ServiceList.MediaCCC;
 
 /**
@@ -49,16 +51,19 @@ public class MediaCCCStreamExtractorTest {
 
         @Test
         public void testUrl() throws Exception {
+            assertIsSecureUrl(extractor.getUrl());
             assertEquals("https://api.media.ccc.de/public/events/gpn18-105-tmux-warum-ein-schwarzes-fenster-am-bildschirm-reicht", extractor.getUrl());
         }
 
         @Test
         public void testOriginalUrl() throws Exception {
+            assertIsSecureUrl(extractor.getOriginalUrl());
             assertEquals("https://media.ccc.de/v/gpn18-105-tmux-warum-ein-schwarzes-fenster-am-bildschirm-reicht", extractor.getOriginalUrl());
         }
 
         @Test
         public void testThumbnail() throws Exception {
+            assertIsSecureUrl(extractor.getThumbnailUrl());
             assertEquals("https://static.media.ccc.de/media/events/gpn/gpn18/105-hd.jpg", extractor.getThumbnailUrl());
         }
 
@@ -69,11 +74,13 @@ public class MediaCCCStreamExtractorTest {
 
         @Test
         public void testUploaderUrl() throws Exception {
+            assertIsSecureUrl(extractor.getUploaderUrl());
             assertEquals("https://api.media.ccc.de/public/conferences/gpn18", extractor.getUploaderUrl());
         }
 
         @Test
         public void testUploaderAvatarUrl() throws Exception {
+            assertIsSecureUrl(extractor.getUploaderAvatarUrl());
             assertEquals("https://static.media.ccc.de/media/events/gpn/gpn18/logo.png", extractor.getUploaderAvatarUrl());
         }
 
@@ -122,16 +129,19 @@ public class MediaCCCStreamExtractorTest {
 
         @Test
         public void testUrl() throws Exception {
+            assertIsSecureUrl(extractor.getUrl());
             assertEquals("https://api.media.ccc.de/public/events/36c3-10565-what_s_left_for_private_messaging", extractor.getUrl());
         }
 
         @Test
         public void testOriginalUrl() throws Exception {
+            assertIsSecureUrl(extractor.getOriginalUrl());
             assertEquals("https://media.ccc.de/v/36c3-10565-what_s_left_for_private_messaging", extractor.getOriginalUrl());
         }
 
         @Test
         public void testThumbnail() throws Exception {
+            assertIsSecureUrl(extractor.getThumbnailUrl());
             assertEquals("https://static.media.ccc.de/media/congress/2019/10565-hd.jpg", extractor.getThumbnailUrl());
         }
 
@@ -142,11 +152,13 @@ public class MediaCCCStreamExtractorTest {
 
         @Test
         public void testUploaderUrl() throws Exception {
+            assertIsSecureUrl(extractor.getUploaderUrl());
             assertEquals("https://api.media.ccc.de/public/conferences/36c3", extractor.getUploaderUrl());
         }
 
         @Test
         public void testUploaderAvatarUrl() throws Exception {
+            assertIsSecureUrl(extractor.getUploaderAvatarUrl());
             assertEquals("https://static.media.ccc.de/media/congress/2019/logo.png", extractor.getUploaderAvatarUrl());
         }