YARN-9727: Allowed Origin pattern is discouraged if regex contains *. Contributed by Zoltan Siegl

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/http/CrossOriginFilter.java

@@ -197,7 +197,7 @@ public class CrossOriginFilter implements Filter {
     LOG.info("Allowed Origins: " + StringUtils.join(allowedOrigins, ','));
     LOG.info("Allow All Origins: " + allowAllOrigins);
     List<String> discouragedAllowedOrigins = allowedOrigins.stream()
-            .filter(s -> s.length() > 1 && s.contains("*"))
+            .filter(s -> s.length() > 1 && s.contains("*") && !(s.startsWith(ALLOWED_ORIGINS_REGEX_PREFIX)))
             .collect(Collectors.toList());
     for (String discouragedAllowedOrigin : discouragedAllowedOrigins) {
         LOG.warn("Allowed Origin pattern '" + discouragedAllowedOrigin + "' is discouraged, use the 'regex:' prefix and use a Java regular expression instead.");