assets.go

/*
Copyright (C) 2021 by nekohasekai <contact-sagernet@sekai.icu>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

package libexclavecore

import (
	"errors"
	"io"
	"os"
	"path/filepath"

	"github.com/exclavenetwork/exclave-core/v5/common/platform/filesystem"
	"golang.org/x/mobile/asset"
)

var (
	assetsPrefix       string
	internalAssetsPath string
	externalAssetsPath string
)

func InitializeV2Ray(internalAssets string, externalAssets string, prefix string) {
	assetsPrefix = prefix
	internalAssetsPath = internalAssets
	externalAssetsPath = externalAssets

	fileSeeker := func(path string) (io.ReadSeekCloser, error) {
		_, fileName := filepath.Split(path)
		if _, err := os.Stat(externalAssetsPath + fileName); err == nil {
			return os.Open(externalAssetsPath + fileName)
		}
		if _, err := os.Stat(internalAssetsPath + fileName); err == nil {
			return os.Open(internalAssetsPath + fileName)
		}
		if file, err := asset.Open(assetsPrefix + fileName); err == nil {
			return file, nil
		}
		return nil, errors.New("asset " + fileName + " not found")
	}

	filesystem.NewFileSeeker = fileSeeker

	filesystem.NewFileReader = func(path string) (io.ReadCloser, error) {
		return fileSeeker(path)
	}
}