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)
var (
configLoaderByName = make(map[string]*ConfigFormat)
configLoaderByExt = make(map[string]*ConfigFormat)
)
// 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 getExtension(filename string) string {
idx := strings.LastIndexByte(filename, '.')
if idx == -1 {
return ""
}
return filename[idx+1:]
}
// LoadConfig loads config with given format from given source.
// input accepts 2 different types:
// * []string slice of multiple filename/url(s) to open to read
// * io.Reader that reads a config content (the original way)
func LoadConfig(formatName string, filename string, input interface{}) (*Config, error) {
ext := getExtension(filename)
if len(ext) > 0 {
if f, found := configLoaderByExt[ext]; found {
return f.Loader(input)
}
}
if f, found := configLoaderByName[formatName]; found {
return f.Loader(input)
}
return nil, newError("Unable to load config in ", formatName).AtWarning()
}
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")
}
},
}))
}