#BAEL-2862: add request wrapper & filter

spring-boot-modules/spring-boot-runtime/src/main/java/com/baeldung/web/log/app/CachedHttpServletRequest.java

@@ -0,0 +1,30 @@
+package com.baeldung.web.log.app;
+
+import org.springframework.util.StreamUtils;
+
+import javax.servlet.ServletInputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+import java.io.*;
+
+public class CachedHttpServletRequest extends HttpServletRequestWrapper {
+
+    private byte[] cachedPayload;
+
+    public CachedHttpServletRequest(HttpServletRequest request) throws IOException {
+        super(request);
+        InputStream requestInputStream = request.getInputStream();
+        this.cachedPayload = StreamUtils.copyToByteArray(requestInputStream);
+    }
+
+    @Override
+    public ServletInputStream getInputStream() {
+        return new CachedServletInputStream(this.cachedPayload);
+    }
+
+    @Override
+    public BufferedReader getReader() {
+        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(this.cachedPayload);
+        return new BufferedReader(new InputStreamReader(byteArrayInputStream));
+    }
+}

spring-boot-modules/spring-boot-runtime/src/main/java/com/baeldung/web/log/app/CachedServletInputStream.java

@@ -0,0 +1,45 @@
+package com.baeldung.web.log.app;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.servlet.ReadListener;
+import javax.servlet.ServletInputStream;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class CachedServletInputStream extends ServletInputStream {
+
+    private final static Logger LOGGER = LoggerFactory.getLogger(CachedServletInputStream.class);
+    private InputStream cachedInputStream;
+
+    public CachedServletInputStream(byte[] cachedBody) {
+        this.cachedInputStream = new ByteArrayInputStream(cachedBody);
+    }
+
+    @Override
+    public boolean isFinished() {
+        try {
+            return cachedInputStream.available() == 0;
+        } catch (IOException exp) {
+            LOGGER.error(exp.getMessage());
+        }
+        return false;
+    }
+
+    @Override
+    public boolean isReady() {
+        return true;
+    }
+
+    @Override
+    public void setReadListener(ReadListener readListener) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public int read() throws IOException {
+        return cachedInputStream.read();
+    }
+}

spring-boot-modules/spring-boot-runtime/src/main/java/com/baeldung/web/log/app/RequestCachingFilter.java

@@ -0,0 +1,33 @@
+package com.baeldung.web.log.app;
+
+import org.apache.commons.io.IOUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebFilter;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+@Order(value = Ordered.HIGHEST_PRECEDENCE)
+@Component
+@WebFilter(filterName = "RequestCachingFilter", urlPatterns = "/*")
+public class RequestCachingFilter extends OncePerRequestFilter {
+
+    private final static Logger LOGGER = LoggerFactory.getLogger(RequestCachingFilter.class);
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
+      FilterChain filterChain) throws ServletException, IOException {
+        CachedHttpServletRequest cachedHttpServletRequest = new CachedHttpServletRequest(request);
+        LOGGER.info("REQUEST DATA: " + IOUtils.toString(cachedHttpServletRequest.getInputStream(), StandardCharsets.UTF_8));
+        filterChain.doFilter(cachedHttpServletRequest, response);
+    }
+}