fixed fetching youtube client name

Author: yausername

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

@@ -7,6 +7,8 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import javax.annotation.Nonnull;
 
@@ -25,6 +27,7 @@
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Localization;
+import org.schabi.newpipe.extractor.utils.Parser;
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
@@ -34,6 +37,7 @@
 public class YoutubeCommentsExtractor extends CommentsExtractor {
 
     private static final String USER_AGENT = "Mozilla/5.0 (Android 8.1.0; Mobile; rv:62.0) Gecko/62.0 Firefox/62.0";
+    private static final Pattern YT_CLIENT_NAME_PATTERN = Pattern.compile("INNERTUBE_CONTEXT_CLIENT_NAME\\\":(.*?)[,}]");
 
     private String ytClientVersion;
     private String ytClientName;
@@ -150,7 +154,7 @@ public void onFetchPage(Downloader downloader) throws IOException, ExtractionExc
         DownloadResponse response = downloader.get(getUrl(), request);
         String responseBody = response.getResponseBody();
         ytClientVersion = findValue(responseBody, "INNERTUBE_CONTEXT_CLIENT_VERSION\":\"", "\"");
-        ytClientName = findValue(responseBody, "INNERTUBE_CONTEXT_CLIENT_NAME\":", ",");
+        ytClientName = Parser.matchGroup1(YT_CLIENT_NAME_PATTERN, responseBody);
         String commentsTokenInside = findValue(responseBody, "commentSectionRenderer", "}");
         String commentsToken = findValue(commentsTokenInside, "continuation\":\"", "\"");
         initPage = getPage(getNextPageUrl(commentsToken));

extractor/src/main/java/org/schabi/newpipe/extractor/utils/Parser.java

@@ -1,10 +1,5 @@
 package org.schabi.newpipe.extractor.utils;
 
-import org.nibor.autolink.LinkExtractor;
-import org.nibor.autolink.LinkSpan;
-import org.nibor.autolink.LinkType;
-import org.schabi.newpipe.extractor.exceptions.ParsingException;
-
 import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
 import java.util.ArrayList;
@@ -14,6 +9,11 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import org.nibor.autolink.LinkExtractor;
+import org.nibor.autolink.LinkSpan;
+import org.nibor.autolink.LinkType;
+import org.schabi.newpipe.extractor.exceptions.ParsingException;
+
 /*
  * Created by Christian Schabesberger on 02.02.16.
  *
@@ -51,18 +51,26 @@ public RegexException(String message) {
     public static String matchGroup1(String pattern, String input) throws RegexException {
         return matchGroup(pattern, input, 1);
     }
+    
+    public static String matchGroup1(Pattern pattern, String input) throws RegexException {
+        return matchGroup(pattern, input, 1);
+    }
 
     public static String matchGroup(String pattern, String input, int group) throws RegexException {
         Pattern pat = Pattern.compile(pattern);
+        return matchGroup(pat, input, group);
+    }
+    
+    public static String matchGroup(Pattern pat, String input, int group) throws RegexException {
         Matcher mat = pat.matcher(input);
         boolean foundMatch = mat.find();
         if (foundMatch) {
             return mat.group(group);
         } else {
             if (input.length() > 1024) {
-                throw new RegexException("failed to find pattern \"" + pattern);
+                throw new RegexException("failed to find pattern \"" + pat.pattern());
             } else {
-                throw new RegexException("failed to find pattern \"" + pattern + " inside of " + input + "\"");
+                throw new RegexException("failed to find pattern \"" + pat.pattern() + " inside of " + input + "\"");
             }
         }
     }