Feat: Log Request IP

src/main/java/eu/europa/ec/dgc/gateway/restapi/filter/IpLoggingFilter.java

@@ -0,0 +1,67 @@
+/*-
+ * ---license-start
+ * EU Digital Green Certificate Gateway Service / dgc-gateway
+ * ---
+ * Copyright (C) 2021 - 2022 T-Systems International GmbH and all other contributors
+ * ---
+ * 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.
+ * ---license-end
+ */
+
+package eu.europa.ec.dgc.gateway.restapi.filter;
+
+import eu.europa.ec.dgc.gateway.utils.DgcMdc;
+import java.io.IOException;
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+@Slf4j
+@Component
+@AllArgsConstructor
+public class IpLoggingFilter extends OncePerRequestFilter {
+
+    public static final String MDC_PROPERTY_SOURCE_IP = "sourceIP";
+
+    public static final String HTTP_HEADER_FORWARDED_FOR = "X-Forwarded-For";
+
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) {
+        return false;
+    }
+
+    @Override
+    protected void doFilterInternal(
+            HttpServletRequest httpServletRequest,
+            HttpServletResponse httpServletResponse,
+            FilterChain filterChain
+    ) throws ServletException, IOException {
+        logger.debug("Checking request for X-Forwarded-For headers");
+
+        String headerForwardedFor =
+                httpServletRequest.getHeader(HTTP_HEADER_FORWARDED_FOR);
+
+        if (headerForwardedFor == null) {
+            log.error("No source IP in request");
+        } else {
+            DgcMdc.put(MDC_PROPERTY_SOURCE_IP, headerForwardedFor);
+        }
+
+        filterChain.doFilter(httpServletRequest, httpServletResponse);
+    }
+}