save/restore session token when users db reloading (if user unlocked);

tracking of when the points.txt file was last modified to detect changes

ii/db.go

@@ -875,6 +875,7 @@ type User struct {
 }
 
 // User database.
+// ModTime: last modification time of points.txt to detect DB changes.
 // FileSize - size of points.txt to detect DB changes.
 // Names: holds User structure by user name
 // ById: holds user name by user id
@@ -887,6 +888,7 @@ type UDB struct {
 	Tokens   map[string]string
 	List     []string
 	Sync     sync.RWMutex
+	ModTime  int64
 	FileSize int64
 }
 
@@ -1088,15 +1090,16 @@ func (db *UDB) Edit(u *User) error {
 	if err := os.Rename(db.Path+".tmp", db.Path); err != nil {
 		return err
 	}
-	db.FileSize = 0 // force to reload
+	db.ModTime = 0 // force to reload
 	return nil
 }
 
-// Load user information in memory if it is needed (FileSize changed).
+// Load user information in memory if it is needed (ModTime or FileSize changed).
 // So, it is safe to call it on every request.
 func (db *UDB) LoadUsers() error {
 	db.Sync.Lock()
 	defer db.Sync.Unlock()
+	var mtime int64
 	var fsize int64
 	file, err := os.Open(db.Path)
 	if err == nil {
@@ -1106,16 +1109,22 @@ func (db *UDB) LoadUsers() error {
 			Error.Printf("Can not stat %s file: %s", db.Path, err)
 			return err
 		}
+		mtime = info.ModTime().Unix()
 		fsize = info.Size()
 	} else if os.IsNotExist(err) {
-		fsize = 0
+		mtime = 0
 	} else {
 		Error.Printf("Can not open %s file: %s", db.Path, err)
 		return err
 	}
-	if db.FileSize == fsize {
+	if db.ModTime == mtime && db.FileSize == fsize {
 		return nil
 	}
+	// save old tokens before reload
+	old_tokens := make(map[string]string)
+	for otoken, oname := range db.Tokens {
+        old_tokens[oname] = otoken
+    }
 	db.Names = make(map[string]User)
 	db.Tokens = make(map[string]string)
 	db.ById = make(map[int32]string)
@@ -1137,8 +1146,15 @@ func (db *UDB) LoadUsers() error {
 		u.Mail = a[2]
 		u.Secret = a[3]
 		u.Tags = NewTags(a[4])
-		//u.Token = a[5]
-		//db.Tokens[u.Token] = u.Name
+		//restore token if user onlocked
+		token, ok := old_tokens[u.Name]
+		if ok {
+			locked, _ := u.Tags.Get("locked")
+			if locked != "" && locked == "no" {
+				u.Token = token
+				db.Tokens[token] = u.Name
+			}
+		}
 		db.ById[u.Id] = u.Name
 		db.Names[u.Name] = u
 		db.List = append(db.List, u.Name)
@@ -1148,6 +1164,7 @@ func (db *UDB) LoadUsers() error {
 		Error.Printf("Can not read user DB: %s", err)
 		return errors.New(err.Error())
 	}
+	db.ModTime = mtime
 	db.FileSize = fsize
 	return nil
 }