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keyfile.go
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keyfile.go
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// package to load/save the mesh key from/to file
package keyfile
import (
"encoding/json"
"errors"
"fmt"
"os"
"strconv"
"strings"
"sync"
"github.com/dekoch/gouniversal/shared/aes"
"github.com/dekoch/gouniversal/shared/config"
"github.com/dekoch/gouniversal/shared/console"
"github.com/dekoch/gouniversal/shared/io/file"
)
const configFilePath = "data/config/mesh/"
type Keyfile struct {
Header config.FileHeader
Key string
}
var (
header config.FileHeader
mut sync.Mutex
)
func init() {
header = config.FileHeader{HeaderVersion: 0.0, FileName: "network.key", ContentName: "networkkey", ContentVersion: 1.0, Comment: ""}
}
func (hc *Keyfile) SetKey(key []byte) {
mut.Lock()
defer mut.Unlock()
hc.Key = keyToString(key)
}
func (hc Keyfile) GetKey() ([]byte, error) {
mut.Lock()
defer mut.Unlock()
return stringToKey(hc.Key)
}
func (hc *Keyfile) loadDefaults() {
mut.Lock()
defer mut.Unlock()
console.Log("loading defaults \""+configFilePath+header.FileName+"\"", " ")
hc.Header = config.BuildHeaderWithStruct(header)
key, err := aes.NewKey(32)
if err != nil {
fmt.Println(err)
} else {
hc.Key = keyToString(key)
}
}
func (hc Keyfile) SaveConfig() error {
mut.Lock()
defer mut.Unlock()
hc.Header = config.BuildHeaderWithStruct(header)
b, err := json.Marshal(hc)
if err != nil {
console.Log(err, "")
return err
}
err = file.WriteFile(configFilePath+header.FileName, b)
if err != nil {
console.Log(err, "")
}
return err
}
func (hc *Keyfile) LoadConfig() error {
if _, err := os.Stat(configFilePath + header.FileName); os.IsNotExist(err) {
// if not found, create default file
hc.loadDefaults()
hc.SaveConfig()
}
mut.Lock()
defer mut.Unlock()
b, err := file.ReadFile(configFilePath + header.FileName)
if err != nil {
console.Log(err, "")
hc.loadDefaults()
} else {
err = json.Unmarshal(b, &hc)
if err != nil {
console.Log(err, "")
hc.loadDefaults()
}
}
if config.CheckHeader(hc.Header, header.ContentName) == false {
err = errors.New("wrong config \"" + configFilePath + header.FileName + "\"")
console.Log(err, "")
hc.loadDefaults()
}
return err
}
// convert byte array to space separated string
func keyToString(key []byte) string {
str := ""
for _, b := range key {
str += strconv.Itoa(int(b)) + " "
}
str = str[:len(str)-1]
return str
}
// convert space separated string to byte array
func stringToKey(key string) ([]byte, error) {
var (
err error
ret []byte
b int
)
for _, s := range strings.Split(key, " ") {
b, err = strconv.Atoi(s)
if err != nil {
return ret, err
}
ret = append(ret, byte(b))
}
return ret, nil
}