feat: API 요청 / 응답 결과 기록 필터 추가

src/main/kotlin/roomescape/common/log/LoggingFilter.kt

@@ -0,0 +1,65 @@
+package roomescape.common.log
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import io.github.oshai.kotlinlogging.KotlinLogging
+import jakarta.servlet.FilterChain
+import jakarta.servlet.http.HttpServletRequest
+import jakarta.servlet.http.HttpServletResponse
+import org.springframework.core.Ordered
+import org.springframework.core.annotation.Order
+import org.springframework.stereotype.Component
+import org.springframework.web.filter.OncePerRequestFilter
+import org.springframework.web.util.ContentCachingRequestWrapper
+import org.springframework.web.util.ContentCachingResponseWrapper
+
+private val log = KotlinLogging.logger {}
+
+@Component
+@Order(Ordered.HIGHEST_PRECEDENCE)
+class LoggingFilter(
+    private val objectMapper: ObjectMapper
+) : OncePerRequestFilter() {
+
+    override fun doFilterInternal(
+        request: HttpServletRequest,
+        response: HttpServletResponse,
+        filterChain: FilterChain
+    ) {
+        val cachedRequest = ContentCachingRequestWrapper(request)
+        val cachedResponse = ContentCachingResponseWrapper(response)
+
+        val startTime = System.currentTimeMillis()
+        filterChain.doFilter(cachedRequest, cachedResponse)
+        val duration = System.currentTimeMillis() - startTime
+
+        logAPISummary(cachedRequest, cachedResponse, duration)
+        cachedResponse.copyBodyToResponse()
+
+    }
+
+    private fun logAPISummary(
+        request: ContentCachingRequestWrapper,
+        response: ContentCachingResponseWrapper,
+        duration: Long
+    ) {
+        val payload = linkedMapOf<String, Any>(
+            "type" to "API_LOG",
+            "method" to request.method,
+            "url" to request.requestURL.toString(),
+        )
+        request.queryString?.let { payload["query_params"] = it }
+        payload["remote_ip"] = request.remoteAddr
+        payload["status_code"] = response.status
+        payload["duration_ms"] = duration
+
+        if (log.isDebugEnabled()) {
+            request.contentAsByteArray.takeIf { it.isNotEmpty() }
+                ?.let { payload["request_body"] = objectMapper.readValue(it, Map::class.java) }
+
+            response.contentAsByteArray.takeIf { it.isNotEmpty() }
+                ?.let { payload["response_body"] = objectMapper.readValue(it, Map::class.java) }
+        }
+
+        log.info { objectMapper.writeValueAsString(payload) }
+    }
+}