Add xhttp transport

common/xray/json/badoption/range.go

@@ -0,0 +1,53 @@
+package badoption
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/sagernet/sing-box/common/xray/crypto"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+type Range struct {
+	From int32 `json:"from"`
+	To   int32 `json:"to"`
+}
+
+func (c *Range) Build() *Range {
+	return (*Range)(c)
+}
+
+func (c *Range) MarshalJSON() ([]byte, error) {
+	return json.Marshal(fmt.Sprintf("%d-%d", c.From, c.To))
+}
+
+func (c *Range) UnmarshalJSON(content []byte) error {
+	var stringValue string
+	err := json.Unmarshal(content, &stringValue)
+	if err != nil {
+		return err
+	}
+	parts := strings.Split(stringValue, "-")
+	if len(parts) != 2 {
+		return E.New("invalid length of range parts")
+	}
+	from, err := strconv.ParseInt(parts[0], 10, 32)
+	if err != nil {
+		return err
+	}
+	to, err := strconv.ParseInt(parts[1], 10, 32)
+	if err != nil {
+		return err
+	}
+	if from > to {
+		return E.New("invalid range")
+	}
+	*c = Range{int32(from), int32(to)}
+	return nil
+}
+
+func (c Range) Rand() int32 {
+	return int32(crypto.RandBetween(int64(c.From), int64(c.To)))
+}