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# -*- coding: utf-8 -*-
# util.py
# Copyright (C) 2013-2017 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Common utils
"""
def force_eval(items):
"""
Return a sequence that evaluates any callable in the sequence,
instantiating it beforehand if the item is a class, and
leaves the non-callable items without change.
"""
def do_eval(thing):
if isinstance(thing, type):
return thing()()
if callable(thing):
return thing()
return thing
if isinstance(items, (list, tuple)):
return map(do_eval, items)
else:
return do_eval(items)
def first(things):
"""
Return the head of a collection.
:param things: a sequence to extract the head from.
:type things: sequence
:return: object, or None
"""
try:
return things[0]
except (IndexError, TypeError):
return None
def get_vpn_launcher():
"""
Return the VPN launcher for the current platform.
"""
from leap.bitmask.system import IS_LINUX, IS_MAC, IS_WIN
if not (IS_LINUX or IS_MAC or IS_WIN):
error_msg = "VPN Launcher not implemented for this platform."
raise NotImplementedError(error_msg)
launcher = None
if IS_LINUX:
from leap.bitmask.vpn.launchers.linux import LinuxVPNLauncher
launcher = LinuxVPNLauncher
elif IS_MAC:
from leap.bitmask.vpn.launchers.darwin import DarwinVPNLauncher
launcher = DarwinVPNLauncher
elif IS_WIN:
from leap.bitmask.vpn.launchers.windows import WindowsVPNLauncher
launcher = WindowsVPNLauncher
if launcher is None:
raise Exception("Launcher is None")
return launcher()
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