added loading username,email,password min and max values from db

modules/serversettings/server_settings.go

@@ -9,6 +9,12 @@ import (
 
 type ServerSettings struct {
 	ExpiredTime    int64
+	UsernameMinLen int64
+	UsernameMaxLen int64
+	EmailMinLen    int64
+	EmailMaxLen    int64
+	PasswordMinLen int64
+	PasswordMaxLen int64
 }
 
 var Settings ServerSettings
@@ -36,13 +42,29 @@ func LoadServerSettings() {
 
 		switch name {
 		case "expired_time":
-			n, err := strconv.ParseInt(value, 0, 64)
-
-			if err != nil {
-				log.Fatalln("failed to parse server setting: expired_time", err)
-			}
-
-			Settings.ExpiredTime = n
+			Settings.ExpiredTime = stringToInt(value)
+		case "username_min_len":
+			Settings.UsernameMinLen = stringToInt(value)
+		case "username_max_len":
+			Settings.UsernameMaxLen = stringToInt(value)
+		case "email_min_len":
+			Settings.EmailMinLen = stringToInt(value)
+		case "email_max_len":
+			Settings.EmailMaxLen = stringToInt(value)
+		case "password_min_len":
+			Settings.PasswordMinLen = stringToInt(value)
+		case "password_max_len":
+			Settings.PasswordMaxLen = stringToInt(value)
 		}
 	}
 }
+
+func stringToInt(s string) int64 {
+	n, err := strconv.ParseInt(s, 0, 64)
+
+	if err != nil {
+		log.Fatalln("failed to parse server setting: ", err)
+	}
+
+	return n
+}