Implement the IPinfoSpringFilter to handle IP data processing earlier in the request cycle.

src/main/java/io/ipinfo/spring/filters/IPinfoSpringFilter.java

@@ -0,0 +1,73 @@
+package io.ipinfo.spring.filters;
+
+import io.ipinfo.api.IPinfo;
+import io.ipinfo.api.model.IPResponse;
+import io.ipinfo.spring.strategies.attribute.AttributeStrategy;
+import io.ipinfo.spring.strategies.ip.IPStrategy;
+import io.ipinfo.spring.strategies.interceptor.InterceptorStrategy;
+
+import jakarta.servlet.Filter;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.FilterConfig;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
+import jakarta.servlet.http.HttpServletRequest;
+import java.io.IOException;
+import java.util.logging.Logger;
+
+public class IPinfoSpringFilter implements Filter {
+    private static final Logger logger = Logger.getLogger(IPinfoSpringFilter.class.getName());
+
+    private final IPinfo ii;
+    private final AttributeStrategy attributeStrategy;
+    private final IPStrategy ipStrategy;
+    private final InterceptorStrategy interceptorStrategy;
+
+    public IPinfoSpringFilter(IPinfo ii, AttributeStrategy attributeStrategy, IPStrategy ipStrategy, InterceptorStrategy interceptorStrategy) {
+        this.ii = ii;
+        this.attributeStrategy = attributeStrategy;
+        this.ipStrategy = ipStrategy;
+        this.interceptorStrategy = interceptorStrategy;
+    }
+
+    @Override
+    public void init(FilterConfig filterConfig) {
+        logger.info("Initializing IPinfoSpringFilter");
+    }
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+        HttpServletRequest httpRequest = (HttpServletRequest) request;
+
+        if (!interceptorStrategy.shouldRun(httpRequest)) {
+            chain.doFilter(request, response);
+            return;
+        }
+
+        if (attributeStrategy.hasAttribute(httpRequest)) {
+            chain.doFilter(request, response);
+            return;
+        }
+
+        String ip = ipStrategy.getIPAddress(httpRequest);
+        if (ip == null) {
+            chain.doFilter(request, response);
+            return;
+        }
+
+        try {
+            IPResponse ipResponse = ii.lookupIP(ip);
+            attributeStrategy.storeAttribute(httpRequest, ipResponse);
+        } catch (Exception e) {
+            logger.severe("Error while fetching IP information: " + e.getMessage());
+        }
+
+        chain.doFilter(request, response);
+    }
+
+    @Override
+    public void destroy() {
+        logger.info("Destroying IPinfoSpringFilter");
+    }
+}