Refactor rules

route/rule_item_domain_keyword.go

@@ -0,0 +1,47 @@
+package route
+
+import (
+	"strings"
+
+	"github.com/sagernet/sing-box/adapter"
+)
+
+var _ RuleItem = (*DomainKeywordItem)(nil)
+
+type DomainKeywordItem struct {
+	keywords []string
+}
+
+func NewDomainKeywordItem(keywords []string) *DomainKeywordItem {
+	return &DomainKeywordItem{keywords}
+}
+
+func (r *DomainKeywordItem) Match(metadata *adapter.InboundContext) bool {
+	var domainHost string
+	if metadata.Domain != "" {
+		domainHost = metadata.Domain
+	} else {
+		domainHost = metadata.Destination.Fqdn
+	}
+	if domainHost == "" {
+		return false
+	}
+	domainHost = strings.ToLower(domainHost)
+	for _, keyword := range r.keywords {
+		if strings.Contains(domainHost, keyword) {
+			return true
+		}
+	}
+	return false
+}
+
+func (r *DomainKeywordItem) String() string {
+	kLen := len(r.keywords)
+	if kLen == 1 {
+		return "domain_keyword=" + r.keywords[0]
+	} else if kLen > 3 {
+		return "domain_keyword=[" + strings.Join(r.keywords[:3], " ") + "...]"
+	} else {
+		return "domain_keyword=[" + strings.Join(r.keywords, " ") + "]"
+	}
+}