feat: add ip-restriction wasm-go plugin (#759)

plugins/wasm-go/extensions/ip-restriction/utils.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"github.com/tidwall/gjson"
+	"github.com/zmap/go-iptree/iptree"
+	"strings"
+)
+
+// parseIPNets 解析Ip段配置
+func parseIPNets(array []gjson.Result) (*iptree.IPTree, error) {
+	if len(array) == 0 {
+		return nil, nil
+	} else {
+		tree := iptree.New()
+		for _, result := range array {
+			err := tree.AddByString(result.String(), 0)
+			if err != nil {
+				return nil, fmt.Errorf("invalid IP[%s]", result.String())
+			}
+		}
+		return tree, nil
+	}
+}
+
+// parseIP 解析IP
+func parseIP(source string) string {
+	if strings.Contains(source, ".") {
+		// parse ipv4
+		return strings.Split(source, ":")[0]
+	}
+	//parse ipv6
+	if strings.Contains(source, "]") {
+		return strings.Split(source, "]")[0][1:]
+	}
+	return source
+}