Fix: processing JSON path (#289)

Co-authored-by: Loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>

Author: DanielLavrushin

plugin/plaintext/common_in.go

@@ -209,11 +209,37 @@ func (t *TextIn) scanFileForJSONIn(reader io.Reader, entry *lib.Entry) error {
 		path = strings.TrimSpace(path)
 
 		result := gjson.GetBytes(data, path)
-		for _, cidr := range result.Array() {
-			if err := entry.AddPrefix(cidr.String()); err != nil {
+		if err := t.processJSONResult(result, entry); err != nil {
+			return fmt.Errorf("❌ [type %s | action %s] failed to process JSON: %v", t.Type, t.Action, err)
+		}
+	}
+
+	return nil
+}
+
+func (t *TextIn) processJSONResult(result gjson.Result, entry *lib.Entry) error {
+	switch {
+	case !result.Exists():
+		return fmt.Errorf("invaild IP address or CIDR (value not exist), please check your specified JSON path or JSON source")
+
+	case result.Type == gjson.String:
+		cidr := strings.TrimSpace(result.String())
+		if cidr == "" {
+			return fmt.Errorf("empty string, please check your specified JSON path or JSON source")
+		}
+		if err := entry.AddPrefix(cidr); err != nil {
+			return err
+		}
+
+	case result.IsArray():
+		for _, item := range result.Array() {
+			if err := t.processJSONResult(item, entry); err != nil {
 				return err
 			}
 		}
+
+	default:
+		return fmt.Errorf("invaild IP address or CIDR, please check your specified JSON path or JSON source")
 	}
 
 	return nil