#!/usr/bin/env python3
import os
import subprocess
from base64 import encodestring as encode

# we expect to find bitmask-dev cloned in the parent folder for this repo
# we will clone it if not
PARENT = '../../'
BITMASK_FOLDER = PARENT + 'bitmask-dev/'
BITMASK_GIT = 'https://0xacab.org/leap/bitmask-dev'
HELPDIR = BITMASK_FOLDER + 'src/leap/bitmask/vpn/helpers/linux/'
INSTALL = 'hooks/install'
POLKIT_FILE = 'se.leap.bitmask.riseupvpn.policy'
APP_NAME = 'riseup-vpn'

if not os.path.isdir(BITMASK_FOLDER):
    print('[+] Cloning bitmask-dev repo to get helpers...')
    cmd = 'cd ../.. && git clone %s' % (BITMASK_GIT, )
    os.system(cmd)
else:
    print('[+] Updating bitmask-dev repo to get helpers...')
    cmd = 'cd ' + BITMASK_FOLDER + ' && git pull'
    os.system(cmd)

with open(os.path.join(HELPDIR, POLKIT_FILE)) as polkit:
    b64_polkit = encode(polkit.read().encode())

with open(INSTALL, 'w') as install:
    install.write('#!/usr/bin/env python3\n')
    install.write('# DO NOT MODIFY MANUALLY\n')
    install.write('# This helper installs the polkit policy file\n')
    install.write('# for the RiseupVPN snap.\n')
    install.write('# It is generated automatically\n')
    install.write('# by the script at "snap/local/pre/pack_installers"\n')
    install.write('import subprocess\n')
    install.write('import os\n')
    install.write('from base64 import decodestring as decode\n')
    install.write("""
POLKIT = {polkit}

with open('/usr/share/polkit-1/actions/{polkit_file}', 'w') as polkit:
    lines = decode(POLKIT).split(b"\\n")
    for line in lines:
        polkit.write(line.decode() + "\\n")

with open('/etc/os-release') as f:
    release = f.read()
# this is a workaround for the fact that debian does not place snap desktop entries in a system+wide path.
if 'ID=debian' in release:
    desktop_path = "/usr/share/applications/{app_name}.desktop"
    if os.path.exists(desktop_path):
        os.remove(desktop_path)
    os.symlink("/snap/{app_name}/current/snap/meta/gui/{app_name}.desktop", desktop_path)
    subprocess.call(['update-desktop-database'])
""".format(
    polkit=b64_polkit,
    polkit_file=POLKIT_FILE,
    app_name=APP_NAME))

subprocess.Popen(["chmod", "+x", INSTALL])
print("[+] Done packing installers into the snap install hook...")