add soundcloud SearchExtractor

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

@@ -0,0 +1,113 @@
+package org.schabi.newpipe.extractor.services.soundcloud;
+
+import com.grack.nanojson.JsonArray;
+import com.grack.nanojson.JsonObject;
+import com.grack.nanojson.JsonParser;
+import com.grack.nanojson.JsonParserException;
+import org.schabi.newpipe.extractor.*;
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.exceptions.ParsingException;
+import org.schabi.newpipe.extractor.search.InfoItemsSearchCollector;
+import org.schabi.newpipe.extractor.search.SearchEngine;
+import org.schabi.newpipe.extractor.search.SearchExtractor;
+import org.schabi.newpipe.extractor.search.SearchQueryUrlHandler;
+import org.schabi.newpipe.extractor.utils.Parser;
+
+import javax.annotation.Nonnull;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import static org.schabi.newpipe.extractor.services.soundcloud.SoundcloudSearchQueryUrlHandler.ITEMS_PER_PAGE;
+
+public class SoundcloudSearchExtractor extends SearchExtractor {
+
+    private JsonArray searchCollection;
+
+    public SoundcloudSearchExtractor(StreamingService service,
+                                     SearchQueryUrlHandler urlIdHandler,
+                                     String contentCountry) {
+        super(service, urlIdHandler, contentCountry);
+    }
+
+    @Override
+    public String getSearchSuggestion() throws ParsingException {
+        return null;
+    }
+
+    @Nonnull
+    @Override
+    public InfoItemsPage<InfoItem> getInitialPage() throws IOException, ExtractionException {
+        return new InfoItemsPage<>(collectItems(searchCollection), getNextPageUrl());
+    }
+
+    @Override
+    public String getNextPageUrl() throws IOException, ExtractionException {
+        return getNextPageUrlFromCurrentUrl(getUrl());
+    }
+
+    @Override
+    public InfoItemsPage<InfoItem> getPage(String pageUrl) throws IOException, ExtractionException {
+        final Downloader dl = getDownloader();
+        try {
+            searchCollection = JsonParser.object().from(dl.download(pageUrl)).getArray("collection");
+        } catch (JsonParserException e) {
+            throw new ParsingException("Could not parse json response", e);
+        }
+
+        return new InfoItemsPage<>(collectItems(searchCollection), getNextPageUrlFromCurrentUrl(pageUrl));
+    }
+
+    @Override
+    public void onFetchPage(@Nonnull Downloader downloader) throws IOException, ExtractionException {
+        final Downloader dl = getDownloader();
+        final String url = getUrl();
+        try {
+            searchCollection = JsonParser.object().from(dl.download(url)).getArray("collection");
+        } catch (JsonParserException e) {
+            throw new ParsingException("Could not parse json response", e);
+        }
+
+        if (searchCollection.size() == 0) {
+            throw new SearchEngine.NothingFoundException("Nothing found");
+        }
+    }
+
+    private InfoItemsCollector<InfoItem, InfoItemExtractor> collectItems(JsonArray searchCollection) {
+        final InfoItemsSearchCollector collector = getInfoItemSearchCollector();
+
+        for (Object result : searchCollection) {
+            if (!(result instanceof JsonObject)) continue;
+            //noinspection ConstantConditions
+            JsonObject searchResult = (JsonObject) result;
+            String kind = searchResult.getString("kind", "");
+            switch (kind) {
+                case "user":
+                    collector.commit(new SoundcloudChannelInfoItemExtractor(searchResult));
+                    break;
+                case "track":
+                    collector.commit(new SoundcloudStreamInfoItemExtractor(searchResult));
+                    break;
+                case "playlist":
+                    collector.commit(new SoundcloudPlaylistInfoItemExtractor(searchResult));
+                    break;
+            }
+        }
+
+        return collector;
+    }
+
+    private String getNextPageUrlFromCurrentUrl(String currentUrl)
+            throws MalformedURLException, UnsupportedEncodingException {
+        final int pageOffset = Integer.parseInt(
+                Parser.compatParseMap(
+                        new URL(currentUrl)
+                                .getQuery())
+                        .get("offset"));
+
+        return currentUrl.replace("&offset=" +
+                        Integer.toString(pageOffset),
+                "&offset=" + Integer.toString(pageOffset + ITEMS_PER_PAGE));
+    }
+}

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudSearchQueryUrlHandler.java

@@ -8,7 +8,7 @@ import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 
-public class SoundcloudQueryUrlHandler extends SearchQueryUrlHandler {
+public class SoundcloudSearchQueryUrlHandler extends SearchQueryUrlHandler {
     public static final String CHARSET_UTF_8 = "UTF-8";
 
     public static final String TRACKS = "tracks";
@@ -16,6 +16,8 @@ public class SoundcloudQueryUrlHandler extends SearchQueryUrlHandler {
     public static final String PLAYLIST = "playlist";
     public static final String ANY = "any";
 
+    public static final int ITEMS_PER_PAGE = 10;
+
     @Override
     public String getUrl() throws ParsingException {
         try {
@@ -40,7 +42,8 @@ public class SoundcloudQueryUrlHandler extends SearchQueryUrlHandler {
 
             return url + "?q=" + URLEncoder.encode(id, CHARSET_UTF_8)
                     + "&client_id=" + SoundcloudParsingHelper.clientId()
-                    + "&limit=10";
+                    + "&limit=" + ITEMS_PER_PAGE
+                    + "&offset=0";
 
         } catch (UnsupportedEncodingException e) {
             throw new ParsingException("Could not encode query", e);

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudService.java

@@ -31,12 +31,12 @@ public class SoundcloudService extends StreamingService {
 
     @Override
     public SearchExtractor getSearchExtractor(SearchQueryUrlHandler queryHandler, String contentCountry) {
-        return null;
+        return new SoundcloudSearchExtractor(this, queryHandler, contentCountry);
     }
 
     @Override
     public SearchQueryUrlHandler getSearchQueryHandler() {
-        return null;
+        return new SoundcloudSearchQueryUrlHandler();
     }
 
     @Override
@@ -56,17 +56,17 @@ public class SoundcloudService extends StreamingService {
 
 
     @Override
-    public StreamExtractor getStreamExtractor(UrlIdHandler urlIdHandler) throws ExtractionException {
+    public StreamExtractor getStreamExtractor(UrlIdHandler urlIdHandler) {
         return new SoundcloudStreamExtractor(this, urlIdHandler);
     }
 
     @Override
-    public ChannelExtractor getChannelExtractor(ListUrlIdHandler urlIdHandler) throws ExtractionException {
+    public ChannelExtractor getChannelExtractor(ListUrlIdHandler urlIdHandler) {
         return new SoundcloudChannelExtractor(this, urlIdHandler);
     }
 
     @Override
-    public PlaylistExtractor getPlaylistExtractor(ListUrlIdHandler urlIdHandler) throws ExtractionException {
+    public PlaylistExtractor getPlaylistExtractor(ListUrlIdHandler urlIdHandler) {
         return new SoundcloudPlaylistExtractor(this, urlIdHandler);
     }
 

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

@@ -80,14 +80,14 @@ public class YoutubeSearchExtractor extends SearchExtractor {
 
     private String getNextPageUrlFromCurrentUrl(String currentUrl)
             throws MalformedURLException, UnsupportedEncodingException {
-        int nextPageNr = Integer.parseInt(
+        final int pageNr = Integer.parseInt(
                 Parser.compatParseMap(
                         new URL(currentUrl)
                                 .getQuery())
-                        .get("page")) + 1;
+                        .get("page"));
 
-        return currentUrl.replace("&page=" + Integer.toString( nextPageNr-1),
-                "&page=" + Integer.toString(nextPageNr));
+        return currentUrl.replace("&page=" + Integer.toString( pageNr),
+                "&page=" + Integer.toString(pageNr + 1));
     }
 
     private InfoItemsSearchCollector collectItems(Document doc) throws NothingFoundException  {