Support audit logs with additional fields (#6738)

This PR adds support

- Request query params
- Request headers
- Response headers

AuditLogEntry is exported and versioned as well
starting with this PR.

cmd/handler-utils.go

@@ -176,14 +176,26 @@ func getRedirectPostRawQuery(objInfo ObjectInfo) string {
 	return redirectValues.Encode()
 }
 
+// Returns access key in the request Authorization header.
+func getReqAccessKey(r *http.Request, region string) (accessKey string) {
+	accessKey, _, _ = getReqAccessKeyV4(r, region)
+	if accessKey == "" {
+		accessKey, _, _ = getReqAccessKeyV2(r)
+	}
+	return accessKey
+}
+
 // Extract request params to be sent with event notifiation.
 func extractReqParams(r *http.Request) map[string]string {
 	if r == nil {
 		return nil
 	}
 
+	region := globalServerConfig.GetRegion()
 	// Success.
 	return map[string]string{
+		"region":          region,
+		"accessKey":       getReqAccessKey(r, region),
 		"sourceIPAddress": handlers.GetSourceIP(r),
 		// Add more fields here.
 	}
@@ -193,6 +205,7 @@ func extractReqParams(r *http.Request) map[string]string {
 func extractRespElements(w http.ResponseWriter) map[string]string {
 
 	return map[string]string{
+		"requestId":      w.Header().Get(responseRequestIDKey),
 		"content-length": w.Header().Get("Content-Length"),
 		// Add more fields here.
 	}