import subprocess

import configparser

import re

import json

import requests

from ast import literal_eval

OBFS_REGEX = re.compile(r'^ServerTransportPlugin (obfs\d+|scramblesuit)')

FTEPROXY_REGEX = re.compile(r'^ServerTransportPlugin fte')

IP_REGEX = re.compile(r'^(OutboundBindAddress)\ (\d{1,3}\.\d{1,3}\.\d{1,3}\.'

                      r'\d{1,3})')

def read_tor_config(configfile='/etc/tor/torrc'):

    with open(configfile) as fb:

        lines = {line[:-1] for line in fb if not line.startswith('#')}

    lines = {line for line in filter(None, lines)}

    return lines

def get_tor_status(name='tor'):

    try:

        pids = subprocess.check_output(['pidof', 'tor']).decode('utf-8')[:-1]

        pids = pids.split(' ')

        pid_file = '.'.join([name, 'pid'])

        pid = open('/'.join(['/var', 'run', 'tor', pid_file])).readline()[:-1]

        if str(pid) in pids:

            return 'Online'

        else:

            return 'Offline'

    except subprocess.CalledProcessError:

        return 'Offline'

def get_tor_fingerprint(name='tor'):

    fingerprint_file = '/'.join(['/var', 'lib', name, 'fingerprint'])

    with open(fingerprint_file) as fb:

        line = fb.readline()[:-1]

    hostname, fingerprint = line.split(' ')

    return hostname, fingerprint

def get_server_type(tor_config):

    if 'BridgeRelay 1' in tor_config:

        return 'Bridge'

    elif 'ExitPolicy reject *:*' in tor_config:

        return 'Relay', None

    else:

        return 'Exit', None

def get_obfs_proxy(tor_config):

    return any(OBFS_REGEX.match(i) for i in tor_config)

def get_fte_proxy(tor_config):

    return any(FTEPROXY_REGEX.match(i) for i in tor_config)

def get_ip(tor_config):

    for i in tor_config:

        match = IP_REGEX.match(i)

        if match is not None:

            return match.groups()[1]

    return None

def get_config():

    config = configparser.ConfigParser()

    config.read('/etc/ennstatus_updater.conf')

    return config

def create_server_json(tor_configfile='/etc/tor/torrc', name='tor'):

    tor_config = read_tor_config(tor_configfile)

    server_type = get_server_type(tor_config)

    hostname, fingerprint = get_tor_fingerprint(name)

    tor_status = get_tor_status(name)

    ip = get_ip(tor_config)

    obfs = None

    fte = None

    if server_type == 'Bridge':

        obfs = get_obfs_proxy(tor_config)

        fte = get_fte_proxy(tor_config)

    dictionary = {'server_type': server_type, 'server_name': hostname,

                  'tor_status': tor_status, 'fingerprint': fingerprint}

    if ip is not None:

        dictionary['ip'] = ip

    if obfs is not None:

        dictionary['obfs'] = obfs

    if fte is not None:

        dictionary['fteproxy'] = fte

    return dictionary

def update_server(server_json, url):

    headers = {'Content-type': 'application/json', 'Accept': 'text/plain'}

    response = requests.post(url + '/api/update', data=json.dumps(server_json),

                             headers=headers)

    return response.text

def main():

    config = get_config()

    ennstatus_url = config['main']['ennstatus_url']

    if 'servers' in config['main']:

        for server in literal_eval(config['main']['servers']):

            server_json = create_server_json(config[server]['configfile'],

                                             server)

            response = update_server(server_json, ennstatus_url)

            print(response, end='')

    else:

        server_json = create_server_json()

        response = update_server(server_json, ennstatus_url)

        print(response, end='')

if __name__ == '__main__':

    main()