Normalize resource URL in ResourceServlet

Issue: SPR-14946

spring-webmvc/src/test/java/org/springframework/web/servlet/ResourceServletTests.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed 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.springframework.web.servlet;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+
+import org.junit.Test;
+
+import org.springframework.mock.web.test.MockHttpServletRequest;
+import org.springframework.mock.web.test.MockHttpServletResponse;
+import org.springframework.mock.web.test.MockServletConfig;
+
+/**
+ * @author Rossen Stoyanchev
+ */
+public class ResourceServletTests {
+
+	@Test(expected = ServletException.class)
+	public void example1() throws Exception {
+		testInvalidResourceUrl("/resources/**", "/resources/../WEB-INF/web.xml");
+	}
+
+	@Test(expected = ServletException.class)
+	public void example2() throws Exception {
+		testInvalidResourceUrl("/resources/*", "/resources/..\\WEB-INF\\web.xml");
+	}
+
+	@Test(expected = ServletException.class)
+	public void example3() throws Exception {
+		testInvalidResourceUrl("/resources/*", "/resources/..\\Servlet2?param=111");
+	}
+
+	private void testInvalidResourceUrl(String allowedResources, String resourceParam)
+			throws ServletException, IOException {
+
+		ResourceServlet servlet = new ResourceServlet();
+		servlet.setAllowedResources(allowedResources);
+		servlet.init(new MockServletConfig());
+
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
+		request.addParameter("resource", resourceParam);
+		MockHttpServletResponse response = new MockHttpServletResponse();
+
+		servlet.service(request, response);
+	}
+
+}