feat: extension support (#78)

pkg/download/engine/inject/file/module.go

@@ -0,0 +1,32 @@
+package file
+
+import (
+	"errors"
+	"github.com/dop251/goja"
+	"io"
+)
+
+type File struct {
+	io.Reader `json:""`
+	io.Closer `json:""`
+	Name      string `json:"name"`
+	Size      int64  `json:"size"`
+}
+
+func NewJsFile(runtime *goja.Runtime) (goja.Value, error) {
+	fileCtor, ok := goja.AssertConstructor(runtime.Get("File"))
+	if !ok {
+		return nil, errors.New("file is not defined")
+	}
+	return fileCtor(nil)
+}
+
+func Enable(runtime *goja.Runtime) error {
+	file := runtime.ToValue(func(call goja.ConstructorCall) *goja.Object {
+		instance := &File{}
+		instanceValue := runtime.ToValue(instance).(*goja.Object)
+		instanceValue.SetPrototype(call.This.Prototype())
+		return instanceValue
+	})
+	return runtime.Set("File", file)
+}