Merge pull request #4552 from hwupathum/new-filter

Implement redirection for trailing slash

Author: hwupathum

core/org.wso2.carbon.tomcat.ext/src/main/java/org/wso2/carbon/tomcat/ext/valves/RequestNormalizationValve.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2026, WSO2 LLC. (http://www.wso2.com).
+ *
+ * WSO2 LLC. 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.wso2.carbon.tomcat.ext.valves;
+
+import org.apache.catalina.connector.Request;
+import org.apache.catalina.connector.Response;
+import org.apache.catalina.valves.ValveBase;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+
+/**
+ * Valve that normalizes request URIs by redirecting to remove trailing slashes.
+ * Only redirects paths longer than "/" that end with trailing slashes and have no query string.
+ */
+public class RequestNormalizationValve extends ValveBase {
+
+	@Override
+	public void invoke(Request request, Response response) throws IOException, ServletException {
+
+		String uri = request.getDecodedRequestURI();
+
+		if (uri != null && uri.length() > 1 && uri.endsWith("/") && request.getQueryString() == null) {
+			uri = uri.replaceAll("/+$", "");
+			response.sendRedirect(uri);
+			return;
+		}
+
+		// Invoking other valves.
+		if (getNext() != null) {
+			getNext().invoke(request, response);
+		}
+	}
+}