HADOOP-15014. Addendum: KMS should log the IP address of the clients. Contributed by Zsombor Gegesy.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
(cherry picked from commit b0131bc265)

hadoop-common-project/hadoop-kms/src/test/java/org/apache/hadoop/crypto/key/kms/server/TestKMSMDCFilter.java

@@ -0,0 +1,88 @@
+/**
+ * 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.hadoop.crypto.key.kms.server;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.mockito.Mockito.when;
+
+import java.io.IOException;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+/**
+ * Test for {@link KMSMDCFilter}.
+ *
+ */
+public class TestKMSMDCFilter {
+
+  private static final String REMOTE_ADDRESS = "192.168.100.100";
+  private static final String URL = "/admin";
+  private static final String METHOD = "GET";
+
+  private KMSMDCFilter filter;
+  private HttpServletRequest httpRequest;
+  private HttpServletResponse httpResponse;
+
+  @Before
+  public void setUp() throws IOException {
+    filter = new KMSMDCFilter();
+    httpRequest = Mockito.mock(HttpServletRequest.class);
+    httpResponse = Mockito.mock(HttpServletResponse.class);
+    KMSMDCFilter.setContext(null, null, null, null);
+  }
+
+  @Test
+  public void testFilter() throws IOException, ServletException {
+    when(httpRequest.getMethod()).thenReturn(METHOD);
+    when(httpRequest.getRequestURL()).thenReturn(new StringBuffer(URL));
+    when(httpRequest.getRemoteAddr()).thenReturn(REMOTE_ADDRESS);
+
+    FilterChain filterChain = new FilterChain() {
+      @Override
+      public void doFilter(ServletRequest request, ServletResponse response)
+          throws IOException, ServletException {
+        assertEquals("filter.remoteClientAddress", REMOTE_ADDRESS,
+            KMSMDCFilter.getRemoteClientAddress());
+        assertEquals("filter.method", METHOD, KMSMDCFilter.getMethod());
+        assertEquals("filter.url", URL, KMSMDCFilter.getURL());
+      }
+    };
+
+    checkMDCValuesAreEmpty();
+    filter.doFilter(httpRequest, httpResponse, filterChain);
+    checkMDCValuesAreEmpty();
+  }
+
+  private void checkMDCValuesAreEmpty() {
+    assertNull("getRemoteClientAddress", KMSMDCFilter.getRemoteClientAddress());
+    assertNull("getMethod", KMSMDCFilter.getMethod());
+    assertNull("getURL", KMSMDCFilter.getURL());
+    assertNull("getUgi", KMSMDCFilter.getUgi());
+  }
+
+}