1 files changed, 87 insertions, 0 deletions
diff --git a/lib/xdsconfig/data.go b/lib/xdsconfig/data.go
new file mode 100644
index 0000000..65e0fc6
--- /dev/null
+++ b/lib/xdsconfig/data.go
@@ -0,0 +1,87 @@
+package xdsconfig
+
+import (
+	"encoding/xml"
+	"fmt"
+	"os"
+
+	common "github.com/iotbzh/xds-common/golib"
+	uuid "github.com/satori/go.uuid"
+	"github.com/syncthing/syncthing/lib/sync"
+)
+
+// xmlServerData contains persistent data stored/loaded by server
+type xmlServerData struct {
+	XMLName xml.Name   `xml:"XDS-Server"`
+	Version string     `xml:"version,attr"`
+	Data    ServerData `xml:"server-data"`
+}
+
+type ServerData struct {
+	ID string `xml:"id"`
+}
+
+var sdMutex = sync.NewMutex()
+
+// ServerIDGet
+func ServerIDGet() (string, error) {
+	var f string
+	var err error
+
+	d := ServerData{}
+	if f, err = ServerDataFilenameGet(); err != nil {
+		return "", err
+	}
+	if err = serverDataRead(f, &d); err != nil || d.ID == "" {
+		// Create a new uuid when not found
+		d.ID = uuid.NewV1().String()
+		if err := serverDataWrite(f, d); err != nil {
+			return "", err
+		}
+	}
+	return d.ID, nil
+}
+
+// serverDataRead reads data saved on disk
+func serverDataRead(file string, data *ServerData) error {
+	if !common.Exists(file) {
+		return fmt.Errorf("No folder config file found (%s)", file)
+	}
+
+	sdMutex.Lock()
+	defer sdMutex.Unlock()
+
+	fd, err := os.Open(file)
+	defer fd.Close()
+	if err != nil {
+		return err
+	}
+
+	xsd := xmlServerData{}
+	err = xml.NewDecoder(fd).Decode(&xsd)
+	if err == nil {
+		*data = xsd.Data
+	}
+	return err
+}
+
+// serverDataWrite writes persistant data to disk
+func serverDataWrite(file string, data ServerData) error {
+	sdMutex.Lock()
+	defer sdMutex.Unlock()
+
+	fd, err := os.OpenFile(file, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
+	defer fd.Close()
+	if err != nil {
+		return err
+	}
+
+	xsd := &xmlServerData{
+		Version: "1",
+		Data:    data,
+	}
+
+	enc := xml.NewEncoder(fd)
+	enc.Indent("", "  ")
+	return enc.Encode(xsd)
+}