internal static bool ApplyModifiers(string modifer, FilePermissions permissions)
{
if (Regex.IsMatch(modifer, "^[0-7]{1,3}$"))
{
permissions.PermissionValue = int.Parse(modifer);
return(true);
}
Match match = Regex.Match(modifer, "^([augo]*)([+=-][rwx]*)+$");
if (match.Success && match.Groups.Count >= 2)
{
string permissionTypeChars = match.Groups[1].Captures[0].Value;
HashSet <FilePermissions.PermissionType> permissionTypes = new HashSet <FilePermissions.PermissionType>();
int lengthOfTypes = Enum.GetValues(typeof(FilePermissions.PermissionType)).Length;
if (permissionTypeChars.Length > 0)
{
foreach (char permissionTypeChar in permissionTypeChars)
{
if (permissionTypes.Count > lengthOfTypes)
{
break;
}
switch (permissionTypeChar)
{
case 'u':
permissionTypes.Add(FilePermissions.PermissionType.User);
continue;
case 'g':
permissionTypes.Add(FilePermissions.PermissionType.Group);
continue;
case 'o':
permissionTypes.Add(FilePermissions.PermissionType.Others);
continue;
case 'a':
permissionTypes.UnionWith(Enum.GetValues(typeof(FilePermissions.PermissionType)).OfType <FilePermissions.PermissionType>());
continue;
default:
return(false);
}
}
}
else
{
//No type specified, default to all types
permissionTypes.UnionWith(Enum.GetValues(typeof(FilePermissions.PermissionType)).OfType <FilePermissions.PermissionType>());
}
foreach (Capture permissionCapture in match.Groups[2].Captures)
{
string permission = permissionCapture.Value;
Logger.Debug($"permission {permission}");
foreach (FilePermissions.PermissionType type in permissionTypes)
{
int permissionDigit = FilePermissions.CalculatePermissionDigit(permission.Contains('r'), permission.Contains('w'), permission.Contains('x'));
switch (permission[0])
{
case '+':
permissionDigit = permissions.GetPermissionDigit(type) | permissionDigit;
break;
case '=':
break;
case '-':
permissionDigit = permissions.GetPermissionDigit(type) & ~permissionDigit;
break;
// Logically there will never be anything but a '+', '=', or '-' here, so default throws exceptions in case of future bugs.
default:
throw new InvalidOperationException($"Invalid permission Modifier '{permission[0]}'");
}
permissions.SetPermission(type, permissionDigit);
}
}
return(true);
}
return(false);
}