Add Surge MITM and scripts

script/modules/sgutils/module.go

@@ -0,0 +1,45 @@
+package sgutils
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io"
+
+	"github.com/sagernet/sing-box/script/jsc"
+	E "github.com/sagernet/sing/common/exceptions"
+
+	"github.com/dop251/goja"
+)
+
+type SurgeUtils struct {
+	vm *goja.Runtime
+}
+
+func Enable(runtime *goja.Runtime) {
+	utils := &SurgeUtils{runtime}
+	object := runtime.NewObject()
+	object.Set("geoip", utils.js_stub)
+	object.Set("ipasn", utils.js_stub)
+	object.Set("ipaso", utils.js_stub)
+	object.Set("ungzip", utils.js_ungzip)
+}
+
+func (u *SurgeUtils) js_stub(call goja.FunctionCall) goja.Value {
+	panic(u.vm.NewGoError(E.New("not implemented")))
+}
+
+func (u *SurgeUtils) js_ungzip(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) != 1 {
+		panic(u.vm.NewGoError(E.New("invalid argument")))
+	}
+	binary := jsc.AssertBinary(u.vm, call.Argument(0), "binary", false)
+	reader, err := gzip.NewReader(bytes.NewReader(binary))
+	if err != nil {
+		panic(u.vm.NewGoError(err))
+	}
+	binary, err = io.ReadAll(reader)
+	if err != nil {
+		panic(u.vm.NewGoError(err))
+	}
+	return jsc.NewUint8Array(u.vm, binary)
+}