YARN-2511. Allowed all origins by default when CrossOriginFilter is enabled. Contributed by Jonathan Eagles.

hadoop-yarn-project/CHANGES.txt

@@ -178,6 +178,9 @@ Release 2.6.0 - UNRELEASED
     YARN-2509. Enable Cross Origin Filter for timeline server only and not all
     Yarn servers (Mit Desai via jeagles)
 
+    YARN-2511. Allowed all origins by default when CrossOriginFilter is
+    enabled. (Jonathan Eagles via zjshen)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/main/java/org/apache/hadoop/yarn/server/timeline/webapp/CrossOriginFilter.java

@@ -76,6 +76,7 @@ public class CrossOriginFilter implements Filter {
   private List<String> allowedMethods = new ArrayList<String>();
   private List<String> allowedHeaders = new ArrayList<String>();
   private List<String> allowedOrigins = new ArrayList<String>();
+  private boolean allowAllOrigins = true;
   private String maxAge;
 
   @Override
@@ -171,7 +172,9 @@ public class CrossOriginFilter implements Filter {
     }
     allowedOrigins =
         Arrays.asList(allowedOriginsConfig.trim().split("\\s*,\\s*"));
+    allowAllOrigins = allowedOrigins.contains("*");
     LOG.info("Allowed Origins: " + StringUtils.join(allowedOrigins, ','));
+    LOG.info("Allow All Origins: " + allowAllOrigins);
   }
 
   private void initializeMaxAge(FilterConfig filterConfig) {
@@ -199,8 +202,9 @@ public class CrossOriginFilter implements Filter {
     return origin != null;
   }
 
-  private boolean isOriginAllowed(String origin) {
-    return allowedOrigins.contains(origin);
+  @VisibleForTesting
+  boolean isOriginAllowed(String origin) {
+    return allowAllOrigins || allowedOrigins.contains(origin);
   }
 
   private boolean areHeadersAllowed(String accessControlRequestHeaders) {
@@ -213,7 +217,7 @@ public class CrossOriginFilter implements Filter {
 
   private boolean isMethodAllowed(String accessControlRequestMethod) {
     if (accessControlRequestMethod == null) {
-      return false;
+      return true;
     }
     return allowedMethods.contains(accessControlRequestMethod);
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/test/java/org/apache/hadoop/yarn/server/timeline/webapp/TestCrossOriginFilter.java

@@ -31,6 +31,7 @@ import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
+import org.junit.Assert;
 import org.junit.Test;
 
 import static org.mockito.Mockito.when;
@@ -65,6 +66,20 @@ public class TestCrossOriginFilter {
     verify(mockChain).doFilter(mockReq, mockRes);
   }
 
+  @Test
+  public void testAllowAllOrigins() throws ServletException, IOException {
+
+    // Setup the configuration settings of the server
+    Map<String, String> conf = new HashMap<String, String>();
+    conf.put(CrossOriginFilter.ALLOWED_ORIGINS, "*");
+    FilterConfig filterConfig = new FilterConfigTest(conf);
+
+    // Object under test
+    CrossOriginFilter filter = new CrossOriginFilter();
+    filter.init(filterConfig);
+    Assert.assertTrue(filter.isOriginAllowed("example.org"));
+  }
+
   @Test
   public void testDisallowedOrigin() throws ServletException, IOException {