Xray-core/infra/conf/serial/loader.go

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2020-11-25 13:01:53 +02:00
package serial
import (
"bytes"
"encoding/json"
"io"
"github.com/xtls/xray-core/v1/common/errors"
"github.com/xtls/xray-core/v1/core"
"github.com/xtls/xray-core/v1/infra/conf"
json_reader "github.com/xtls/xray-core/v1/infra/conf/json"
)
type offset struct {
line int
char int
}
func findOffset(b []byte, o int) *offset {
if o >= len(b) || o < 0 {
return nil
}
line := 1
char := 0
for i, x := range b {
if i == o {
break
}
if x == '\n' {
line++
char = 0
} else {
char++
}
}
return &offset{line: line, char: char}
}
// DecodeJSONConfig reads from reader and decode the config into *conf.Config
// syntax error could be detected.
func DecodeJSONConfig(reader io.Reader) (*conf.Config, error) {
jsonConfig := &conf.Config{}
jsonContent := bytes.NewBuffer(make([]byte, 0, 10240))
jsonReader := io.TeeReader(&json_reader.Reader{
Reader: reader,
}, jsonContent)
decoder := json.NewDecoder(jsonReader)
if err := decoder.Decode(jsonConfig); err != nil {
var pos *offset
cause := errors.Cause(err)
switch tErr := cause.(type) {
case *json.SyntaxError:
pos = findOffset(jsonContent.Bytes(), int(tErr.Offset))
case *json.UnmarshalTypeError:
pos = findOffset(jsonContent.Bytes(), int(tErr.Offset))
}
if pos != nil {
return nil, newError("failed to read config file at line ", pos.line, " char ", pos.char).Base(err)
}
return nil, newError("failed to read config file").Base(err)
}
return jsonConfig, nil
}
func LoadJSONConfig(reader io.Reader) (*core.Config, error) {
jsonConfig, err := DecodeJSONConfig(reader)
if err != nil {
return nil, err
}
pbConfig, err := jsonConfig.Build()
if err != nil {
return nil, newError("failed to parse json config").Base(err)
}
return pbConfig, nil
}