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assets.go
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assets.go
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package libcore
import (
"github.com/pkg/errors"
"github.com/sagernet/gomobile/asset"
"github.com/sirupsen/logrus"
"github.com/xtls/xray-core/common/platform/filesystem"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"sync"
)
const (
geoipDat = "geoip.dat"
geositeDat = "geosite.dat"
geoipVersion = "geoip.version.txt"
geositeVersion = "geosite.version.txt"
)
var assetsPrefix string
var internalAssetsPath string
var externalAssetsPath string
var useOfficialAssets bool
var extracted map[string]bool
var assetsAccess *sync.Mutex
type BoolFunc interface {
Invoke() bool
}
func InitializeV2Ray(internalAssets string, externalAssets string, prefix string, useOfficial BoolFunc) error {
assetsAccess = new(sync.Mutex)
assetsAccess.Lock()
extracted = make(map[string]bool)
assetsPrefix = prefix
internalAssetsPath = internalAssets
externalAssetsPath = externalAssets
filesystem.NewFileReader = func(path string) (io.ReadCloser, error) {
_, fileName := filepath.Split(path)
if !extracted[fileName] {
assetsAccess.Lock()
assetsAccess.Unlock()
}
paths := []string{
internalAssetsPath + fileName,
externalAssetsPath + fileName,
}
var err error
for _, path = range paths {
_, err = os.Stat(path)
if err == nil {
return os.Open(path)
}
}
file, err := asset.Open(assetsPrefix + fileName)
if err == nil {
extracted[fileName] = true
return file, nil
}
err = extractAssetName(fileName, false)
if err != nil {
return nil, err
}
for _, path = range paths {
_, err = os.Stat(path)
if err == nil {
return os.Open(path)
}
if !os.IsNotExist(err) {
return nil, err
}
}
return nil, err
}
extract := func(name string) {
err := extractAssetName(name, false)
if err != nil {
logrus.Warnf("Extract %s failed: %v", geoipDat, err)
} else {
extracted[name] = true
}
}
go func() {
defer assetsAccess.Unlock()
useOfficialAssets = useOfficial.Invoke()
extract(geoipDat)
extract(geositeDat)
}()
return nil
}
func extractAssetName(name string, force bool) error {
dir := externalAssetsPath
var version string
switch name {
case geoipDat:
version = geoipVersion
case geositeDat:
version = geositeVersion
}
var localVersion string
var assetVersion string
loadAssetVersion := func() error {
av, err := asset.Open(assetsPrefix + version)
if err != nil {
return errors.WithMessage(err, "open version in assets")
}
b, err := ioutil.ReadAll(av)
closeIgnore(av)
if err != nil {
return errors.WithMessage(err, "read internal version")
}
assetVersion = string(b)
return nil
}
doExtract := false
// check version
if _, versionNotFoundError := os.Stat(dir + version); versionNotFoundError != nil {
_, assetNotFoundError := os.Stat(dir + name)
doExtract = assetNotFoundError != nil || force
} else if useOfficialAssets {
b, err := ioutil.ReadFile(dir + version)
if err != nil {
doExtract = true
_ = os.RemoveAll(version)
} else {
localVersion = string(b)
err = loadAssetVersion()
if err != nil {
return err
}
av, err := strconv.ParseUint(assetVersion, 10, 64)
if err != nil {
doExtract = assetVersion != localVersion || force
} else {
lv, err := strconv.ParseUint(localVersion, 10, 64)
doExtract = err != nil || av > lv || force
}
}
} else {
doExtract = force
}
if doExtract {
if assetVersion == "" {
err := loadAssetVersion()
if err != nil {
return err
}
}
} else {
return nil
}
err := extractAsset(assetsPrefix+name+".xz", dir+name)
if err == nil {
err = unxz(dir + name)
}
if err != nil {
return err
}
o, err := os.Create(dir + version)
if err != nil {
return err
}
_, err = io.WriteString(o, assetVersion)
closeIgnore(o)
return err
}
func extractAsset(assetPath string, path string) error {
i, err := asset.Open(assetPath)
if err != nil {
return err
}
defer closeIgnore(i)
o, err := os.Create(path)
if err != nil {
return err
}
defer closeIgnore(o)
_, err = io.Copy(o, i)
if err == nil {
logrus.Debugf("Extract >> %s", path)
}
return err
}