[improve][broker] Give the detail msg when authencate error

pulsar-broker-common/src/main/java/org/apache/pulsar/broker/web/AuthenticationFilter.java

@@ -60,9 +60,13 @@
         try {
             doFilter = authenticationService.authenticateHttpRequest(httpRequest, httpResponse);
         } catch (Exception e) {
-            httpResponse.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authentication required");
+            String msg = e.getMessage();
+            if (msg == null) {
+                msg = "Authentication required";
+            }
+            httpResponse.sendError(HttpServletResponse.SC_UNAUTHORIZED, msg);
             if (e instanceof AuthenticationException) {
-                LOG.warn("[{}] Failed to authenticate HTTP request: {}", request.getRemoteAddr(), e.getMessage());
+                LOG.warn("[{}] Failed to authenticate HTTP request: {}", request.getRemoteAddr(), msg);
             } else {
                 LOG.error("[{}] Error performing authentication for HTTP", request.getRemoteAddr(), e);
             }

pulsar-broker-common/src/test/java/org/apache/pulsar/broker/web/AuthenticationFilterTest.java

@@ -0,0 +1,107 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.broker.web;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import javax.naming.AuthenticationException;
+import javax.servlet.FilterChain;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.apache.pulsar.broker.authentication.AuthenticationService;
+import org.testng.annotations.Test;
+
+public class AuthenticationFilterTest {
+
+    @Test
+    public void testDoFilterWithAuthenticationException() throws Exception {
+        AuthenticationService authenticationService = mock(AuthenticationService.class);
+        AuthenticationFilter filter = new AuthenticationFilter(authenticationService);
+
+        HttpServletRequest request = mock(HttpServletRequest.class);
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        FilterChain chain = mock(FilterChain.class);
+
+        String errorMsg = "Specific authentication error";
+        doThrow(new AuthenticationException(errorMsg))
+                .when(authenticationService)
+                .authenticateHttpRequest(any(HttpServletRequest.class), any(HttpServletResponse.class));
+
+        filter.doFilter(request, response, chain);
+
+        verify(response).sendError(HttpServletResponse.SC_UNAUTHORIZED, errorMsg);
+    }
+
+    @Test
+    public void testDoFilterWithGenericException() throws Exception {
+        AuthenticationService authenticationService = mock(AuthenticationService.class);
+        AuthenticationFilter filter = new AuthenticationFilter(authenticationService);
+
+        HttpServletRequest request = mock(HttpServletRequest.class);
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        FilterChain chain = mock(FilterChain.class);
+
+        String errorMsg = "Some internal error";
+        doThrow(new RuntimeException(errorMsg))
+                .when(authenticationService)
+                .authenticateHttpRequest(any(HttpServletRequest.class), any(HttpServletResponse.class));
+
+        filter.doFilter(request, response, chain);
+
+        verify(response).sendError(HttpServletResponse.SC_UNAUTHORIZED, errorMsg);
+    }
+
+    @Test
+    public void testDoFilterWithNullMessageGenericException() throws Exception {
+        AuthenticationService authenticationService = mock(AuthenticationService.class);
+        AuthenticationFilter filter = new AuthenticationFilter(authenticationService);
+
+        HttpServletRequest request = mock(HttpServletRequest.class);
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        FilterChain chain = mock(FilterChain.class);
+
+        doThrow(new RuntimeException())
+                .when(authenticationService)
+                .authenticateHttpRequest(any(HttpServletRequest.class), any(HttpServletResponse.class));
+
+        filter.doFilter(request, response, chain);
+
+        verify(response).sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authentication required");
+    }
+
+    @Test
+    public void testDoFilterWithNullMessageAuthenticationException() throws Exception {
+        AuthenticationService authenticationService = mock(AuthenticationService.class);
+        AuthenticationFilter filter = new AuthenticationFilter(authenticationService);
+
+        HttpServletRequest request = mock(HttpServletRequest.class);
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        FilterChain chain = mock(FilterChain.class);
+
+        doThrow(new AuthenticationException(null))
+                .when(authenticationService)
+                .authenticateHttpRequest(any(HttpServletRequest.class), any(HttpServletResponse.class));
+
+        filter.doFilter(request, response, chain);
+
+        verify(response).sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authentication required");
+    }
+}