Xray-core/core/config.go

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package core
import (
"io"
"strings"
"github.com/golang/protobuf/proto"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/cmdarg"
"github.com/xtls/xray-core/main/confloader"
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)
// ConfigFormat is a configurable format of Xray config file.
type ConfigFormat struct {
Name string
Extension []string
Loader ConfigLoader
}
// ConfigLoader is a utility to load Xray config from external source.
type ConfigLoader func(input interface{}) (*Config, error)
// ConfigBuilder is a builder to build core.Config from filenames and formats
type ConfigBuilder func(files []string, formats []string) (*Config, error)
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var (
configLoaderByName = make(map[string]*ConfigFormat)
configLoaderByExt = make(map[string]*ConfigFormat)
ConfigBuilderForFiles ConfigBuilder
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)
// RegisterConfigLoader add a new ConfigLoader.
func RegisterConfigLoader(format *ConfigFormat) error {
name := strings.ToLower(format.Name)
if _, found := configLoaderByName[name]; found {
return newError(format.Name, " already registered.")
}
configLoaderByName[name] = format
for _, ext := range format.Extension {
lext := strings.ToLower(ext)
if f, found := configLoaderByExt[lext]; found {
return newError(ext, " already registered to ", f.Name)
}
configLoaderByExt[lext] = format
}
return nil
}
func GetFormatByExtension(ext string) string {
switch strings.ToLower(ext) {
case "pb", "protobuf":
return "protobuf"
case "yaml", "yml":
return "yaml"
case "toml":
return "toml"
case "json":
return "json"
default:
return ""
}
}
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func getExtension(filename string) string {
idx := strings.LastIndexByte(filename, '.')
if idx == -1 {
return ""
}
return filename[idx+1:]
}
func getFormat(filename string) string {
return GetFormatByExtension(getExtension(filename))
}
func LoadConfig(formatName string, input interface{}) (*Config, error) {
switch v := input.(type) {
case cmdarg.Arg:
formats := make([]string, len(v))
hasProtobuf := false
for i, file := range v {
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var f string
if formatName == "auto" {
f = getFormat(file)
if f == "" {
return nil, newError("Unable to get format of", formatName).AtWarning()
}
}
if f == "" {
f = formatName
}
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if f == "protobuf" {
hasProtobuf = true
}
formats[i] = f
}
// only one protobuf config file is allowed
if hasProtobuf {
if len(v) == 1 {
return configLoaderByName["protobuf"].Loader(v)
} else {
return nil, newError("Only one protobuf config file is allowed").AtWarning()
}
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}
// to avoid import cycle
return ConfigBuilderForFiles(v, formats)
case io.Reader:
if f, found := configLoaderByName[formatName]; found {
return f.Loader(v)
} else {
return nil, newError("Unable to load config in", formatName).AtWarning()
}
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}
return nil, newError("Unable to load config").AtWarning()
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}
func loadProtobufConfig(data []byte) (*Config, error) {
config := new(Config)
if err := proto.Unmarshal(data, config); err != nil {
return nil, err
}
return config, nil
}
func init() {
common.Must(RegisterConfigLoader(&ConfigFormat{
Name: "Protobuf",
Extension: []string{"pb"},
Loader: func(input interface{}) (*Config, error) {
switch v := input.(type) {
case cmdarg.Arg:
r, err := confloader.LoadConfig(v[0])
common.Must(err)
data, err := buf.ReadAllToBytes(r)
common.Must(err)
return loadProtobufConfig(data)
case io.Reader:
data, err := buf.ReadAllToBytes(v)
common.Must(err)
return loadProtobufConfig(data)
default:
return nil, newError("unknow type")
}
},
}))
}