Search: add isCorrectedSearch() and fix YoutubeSearchExtractor#getSearchSuggestion()

isCorrectedSearch: see the javadoc
getSearchSuggestion: in YoutubeSearchExtractor, it was giving the corrected search query. It now gives the suggested query, as it should

extractor/src/main/java/org/schabi/newpipe/extractor/search/SearchExtractor.java

@@ -37,4 +37,15 @@ public abstract class SearchExtractor extends ListExtractor<InfoItem> {
     public String getName() {
         return getLinkHandler().getSearchString();
     }
+
+    /**
+     * When you search on some service, it can give you another and corrected request.
+     * This method says if it's the case.
+     * <p>
+     * Example: on YouTube, if you search for "pewdeipie",
+     * it will give you results for "pewdiepie", then isCorrectedSearch should return true.
+     *
+     * @return whether the results comes from a corrected query or not.
+     */
+    public abstract boolean isCorrectedSearch() throws ParsingException;
 }

extractor/src/main/java/org/schabi/newpipe/extractor/search/SearchInfo.java

@@ -15,6 +15,7 @@ public class SearchInfo extends ListInfo<InfoItem> {
 
     private String searchString;
     private String searchSuggestion;
+    private boolean isCorrectedSearch;
 
     public SearchInfo(int serviceId,
                       SearchQueryHandler qIHandler,
@@ -46,6 +47,11 @@ public class SearchInfo extends ListInfo<InfoItem> {
         } catch (Exception e) {
             info.addError(e);
         }
+        try {
+            info.isCorrectedSearch = extractor.isCorrectedSearch();
+        } catch (Exception e) {
+            info.addError(e);
+        }
 
         ListExtractor.InfoItemsPage<InfoItem> page = ExtractorHelper.getItemsPageOrLogError(info, extractor);
         info.setRelatedItems(page.getItems());
@@ -70,4 +76,8 @@ public class SearchInfo extends ListInfo<InfoItem> {
     public String getSearchSuggestion() {
         return searchSuggestion;
     }
+
+    public boolean isCorrectedSearch() {
+        return this.isCorrectedSearch;
+    }
 }

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

@@ -47,6 +47,11 @@ public class MediaCCCSearchExtractor extends SearchExtractor {
         return null;
     }
 
+    @Override
+    public boolean isCorrectedSearch() {
+        return false;
+    }
+
     @Nonnull
     @Override
     public InfoItemsPage<InfoItem> getInitialPage() {

extractor/src/main/java/org/schabi/newpipe/extractor/services/peertube/extractors/PeertubeSearchExtractor.java

@@ -40,6 +40,11 @@ public class PeertubeSearchExtractor extends SearchExtractor {
         return null;
     }
 
+    @Override
+    public boolean isCorrectedSearch() {
+        return false;
+    }
+
     @Override
     public InfoItemsPage<InfoItem> getInitialPage() throws IOException, ExtractionException {
         super.fetchPage();

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

@@ -38,6 +38,11 @@ public class SoundcloudSearchExtractor extends SearchExtractor {
         return null;
     }
 
+    @Override
+    public boolean isCorrectedSearch() {
+        return false;
+    }
+
     @Nonnull
     @Override
     public InfoItemsPage<InfoItem> getInitialPage() throws IOException, ExtractionException {

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

@@ -135,6 +135,19 @@ public class YoutubeMusicSearchExtractor extends SearchExtractor {
         return getTextFromObject(didYouMeanRenderer.getObject("correctedQuery"));
     }
 
+    @Override
+    public boolean isCorrectedSearch() {
+        final JsonObject itemSectionRenderer = initialData.getObject("contents").getObject("sectionListRenderer")
+                .getArray("contents").getObject(0).getObject("itemSectionRenderer");
+        if (itemSectionRenderer == null) {
+            return false;
+        }
+
+        JsonObject showingResultsForRenderer = itemSectionRenderer.getArray("contents").getObject(0)
+                .getObject("showingResultsForRenderer");
+        return showingResultsForRenderer != null;
+    }
+
     @Nonnull
     @Override
     public InfoItemsPage<InfoItem> getInitialPage() throws ExtractionException, IOException {

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

@@ -2,7 +2,6 @@ package org.schabi.newpipe.extractor.services.youtube.extractors;
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
-
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.downloader.Downloader;
@@ -12,10 +11,10 @@ import org.schabi.newpipe.extractor.linkhandler.SearchQueryHandler;
 import org.schabi.newpipe.extractor.localization.TimeAgoParser;
 import org.schabi.newpipe.extractor.search.InfoItemsSearchCollector;
 import org.schabi.newpipe.extractor.search.SearchExtractor;
-
+import org.schabi.newpipe.extractor.utils.JsonUtils;
-import java.io.IOException;
 
 import javax.annotation.Nonnull;
+import java.io.IOException;
 
 import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getJsonResponse;
 import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getTextFromObject;
@@ -64,15 +63,25 @@ public class YoutubeSearchExtractor extends SearchExtractor {
 
     @Override
     public String getSearchSuggestion() throws ParsingException {
+        final JsonObject didYouMeanRenderer = initialData.getObject("contents")
+                .getObject("twoColumnSearchResultsRenderer").getObject("primaryContents")
+                .getObject("sectionListRenderer").getArray("contents").getObject(0)
+                .getObject("itemSectionRenderer").getArray("contents").getObject(0)
+                .getObject("didYouMeanRenderer");
+        if (didYouMeanRenderer == null) {
+            return "";
+        }
+        return JsonUtils.getString(didYouMeanRenderer, "correctedQueryEndpoint.searchEndpoint.query");
+    }
+
+    @Override
+    public boolean isCorrectedSearch() {
         final JsonObject showingResultsForRenderer = initialData.getObject("contents")
                 .getObject("twoColumnSearchResultsRenderer").getObject("primaryContents")
                 .getObject("sectionListRenderer").getArray("contents").getObject(0)
                 .getObject("itemSectionRenderer").getArray("contents").getObject(0)
                 .getObject("showingResultsForRenderer");
-        if (!showingResultsForRenderer.has("correctedQuery")) {
+        return showingResultsForRenderer != null;
-            return "";
-        }
-        return getTextFromObject(showingResultsForRenderer.getObject("correctedQuery"));
     }
 
     @Nonnull

extractor/src/test/java/org/schabi/newpipe/extractor/services/BaseSearchExtractorTest.java

@@ -4,4 +4,5 @@ package org.schabi.newpipe.extractor.services;
 public interface BaseSearchExtractorTest extends BaseListExtractorTest {
     void testSearchString() throws Exception;
     void testSearchSuggestion() throws Exception;
+    void testSearchCorrected() throws Exception;
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/DefaultSearchExtractorTest.java

@@ -15,6 +15,10 @@ public abstract class DefaultSearchExtractorTest extends DefaultListExtractorTes
     public abstract String expectedSearchString();
     @Nullable public abstract String expectedSearchSuggestion();
 
+    public boolean isCorrectedSearch() {
+        return false;
+    }
+
     @Test
     @Override
     public void testSearchString() throws Exception {
@@ -31,4 +35,9 @@ public abstract class DefaultSearchExtractorTest extends DefaultListExtractorTes
             assertEquals(expectedSearchSuggestion, extractor().getSearchSuggestion());
         }
     }
+
+    @Test
+    public void testSearchCorrected() throws Exception {
+        assertEquals(isCorrectedSearch(), extractor().isCorrectedSearch());
+    }
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/search/YoutubeMusicSearchExtractorTest.java

@@ -150,4 +150,27 @@ public class YoutubeMusicSearchExtractorTest {
         @Nullable @Override public String expectedSearchSuggestion() { return "mega man x3"; }
         @Override public InfoItem.InfoType expectedInfoItemType() { return InfoItem.InfoType.STREAM; }
     }
+
+    public static class CorrectedSearch extends DefaultSearchExtractorTest {
+        private static SearchExtractor extractor;
+        private static final String QUERY = "duo lipa";
+
+        @BeforeClass
+        public static void setUp() throws Exception {
+            NewPipe.init(DownloaderTestImpl.getInstance());
+            extractor = YouTube.getSearchExtractor(QUERY, singletonList(YoutubeSearchQueryHandlerFactory.MUSIC_SONGS), "");
+            extractor.fetchPage();
+        }
+
+        @Override public SearchExtractor extractor() { return extractor; }
+        @Override public StreamingService expectedService() { return YouTube; }
+        @Override public String expectedName() { return QUERY; }
+        @Override public String expectedId() { return QUERY; }
+        @Override public String expectedUrlContains() { return "music.youtube.com/search?q=" + URLEncoder.encode(QUERY); }
+        @Override public String expectedOriginalUrlContains() { return "music.youtube.com/search?q=" + URLEncoder.encode(QUERY); }
+        @Override public String expectedSearchString() { return QUERY; }
+        @Nullable @Override public String expectedSearchSuggestion() { return null; }
+        @Override public InfoItem.InfoType expectedInfoItemType() { return InfoItem.InfoType.STREAM; }
+        @Override public boolean isCorrectedSearch() { return true; }
+    }
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/search/YoutubeSearchExtractorTest.java

@@ -114,8 +114,8 @@ public class YoutubeSearchExtractorTest {
 
     public static class Suggestion extends DefaultSearchExtractorTest {
         private static SearchExtractor extractor;
-        private static final String QUERY = "pewdeipie";
+        private static final String QUERY = "newpip";
-        private static final String EXPECTED_SUGGESTION = "pewdiepie";
+        private static final String EXPECTED_SUGGESTION = "newpipe";
 
         @BeforeClass
         public static void setUp() throws Exception {
@@ -132,10 +132,32 @@ public class YoutubeSearchExtractorTest {
         @Override public String expectedOriginalUrlContains() { return "youtube.com/results?search_query=" + QUERY; }
         @Override public String expectedSearchString() { return QUERY; }
         @Nullable @Override public String expectedSearchSuggestion() { return EXPECTED_SUGGESTION; }
-
         @Override public InfoItem.InfoType expectedInfoItemType() { return InfoItem.InfoType.STREAM; }
     }
 
+    public static class CorrectedSearch extends DefaultSearchExtractorTest {
+        private static SearchExtractor extractor;
+        private static final String QUERY = "pewdeipie";
+
+        @BeforeClass
+        public static void setUp() throws Exception {
+            NewPipe.init(DownloaderTestImpl.getInstance());
+            extractor = YouTube.getSearchExtractor(QUERY, singletonList(VIDEOS), "");
+            extractor.fetchPage();
+        }
+
+        @Override public SearchExtractor extractor() { return extractor; }
+        @Override public StreamingService expectedService() { return YouTube; }
+        @Override public String expectedName() { return QUERY; }
+        @Override public String expectedId() { return QUERY; }
+        @Override public String expectedUrlContains() { return "youtube.com/results?search_query=" + QUERY; }
+        @Override public String expectedOriginalUrlContains() { return "youtube.com/results?search_query=" + QUERY; }
+        @Override public String expectedSearchString() { return QUERY; }
+        @Nullable @Override public String expectedSearchSuggestion() { return null; }
+        @Override public InfoItem.InfoType expectedInfoItemType() { return InfoItem.InfoType.STREAM; }
+        @Override public boolean isCorrectedSearch() { return true; }
+    }
+
     public static class RandomQueryNoMorePages extends DefaultSearchExtractorTest {
         private static SearchExtractor extractor;
         private static final String QUERY = "UCO6AK";