feat: extension support (#78)

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

@@ -0,0 +1,68 @@
+package formdata
+
+import "github.com/dop251/goja"
+
+type FormData struct {
+	data map[string]any
+}
+
+func (fd *FormData) Append(name string, value any) {
+	fd.data[name] = value
+}
+
+func (fd *FormData) Delete(name string) {
+	delete(fd.data, name)
+}
+
+func (fd *FormData) Entries() []any {
+	var entries []any
+	for k, v := range fd.data {
+		entries = append(entries, []any{k, v})
+	}
+	return entries
+}
+
+func (fd *FormData) Get(name string) any {
+	return fd.data[name]
+}
+
+func (fd *FormData) GetAll(name string) []any {
+	return []any{fd.data[name]}
+}
+
+func (fd *FormData) Has(name string) bool {
+	_, ok := fd.data[name]
+	return ok
+}
+
+func (fd *FormData) Keys() []string {
+	var keys []string
+	for k := range fd.data {
+		keys = append(keys, k)
+	}
+	return keys
+}
+
+func (fd *FormData) Set(name string, value any) {
+	fd.data[name] = value
+}
+
+func (fd *FormData) Values() []any {
+	var values []any
+	for _, v := range fd.data {
+		values = append(values, v)
+	}
+	return values
+}
+
+func Enable(runtime *goja.Runtime) error {
+	file := runtime.ToValue(func(call goja.ConstructorCall) *goja.Object {
+		instance := &FormData{
+			data: make(map[string]any),
+		}
+		instanceValue := runtime.ToValue(instance).(*goja.Object)
+		instanceValue.SetPrototype(call.This.Prototype())
+		return instanceValue
+	})
+	return runtime.Set("FormData", file)
+}