#!/usr/bin/env python3.5
# -*-coding:UTF-8 -*
"""
The ZMQ_Sub_Onion Module
============================

This module is consuming the Redis-list created by the ZMQ_Sub_Onion_Q Module.

It trying to extract url from paste and returning only ones which are tor
related (.onion)

    ..seealso:: Paste method (get_regex)

..note:: Module ZMQ_Something_Q and ZMQ_Something are closely bound, always put
the same Subscriber name in both of them.

Requirements
------------

*Need running Redis instances. (Redis)
*Need the ZMQ_Sub_Onion_Q Module running to be able to work properly.

"""
import pprint
import time
from packages import Paste
from pubsublogger import publisher
import datetime
import os
import base64
import subprocess
import redis

from Helper import Process


def fetch(p, r_cache, urls, domains, path):
    failed = []
    downloaded = []
    print(len(urls), 'Urls to fetch.')
    for url, domain in zip(urls, domains):
        if r_cache.exists(url) or url in failed:
            continue
        to_fetch = base64.standard_b64encode(url.encode('utf8'))
        print(to_fetch)
        process = subprocess.Popen(["python", './tor_fetcher.py', to_fetch],
                                   stdout=subprocess.PIPE)
        while process.poll() is None:
            time.sleep(1)

        if process.returncode == 0:
            r_cache.setbit(url, 0, 1)
            r_cache.expire(url, 360000)
            downloaded.append(url)
            tempfile = process.stdout.read().strip()
            tempfile = tempfile.decode('utf8')
            with open(tempfile, 'r') as f:
                filename = path + domain + '.gz'
                fetched = f.read()
                content = base64.standard_b64decode(fetched)
                save_path = os.path.join(os.environ['AIL_HOME'],
                                         p.config.get("Directories", "pastes"),
                                         filename)
                dirname = os.path.dirname(save_path)
                if not os.path.exists(dirname):
                    os.makedirs(dirname)
                with open(save_path, 'w') as ff:
                    ff.write(content)
                p.populate_set_out(save_path, 'Global')
                p.populate_set_out(url, 'ValidOnion')
                p.populate_set_out(fetched, 'FetchedOnion')
                yield url
            os.unlink(tempfile)
        else:
            r_cache.setbit(url, 0, 0)
            r_cache.expire(url, 3600)
            failed.append(url)
            print('Failed at downloading', url)
            print(process.stdout.read())
    print('Failed:', len(failed), 'Downloaded:', len(downloaded))


if __name__ == "__main__":
    publisher.port = 6380
    publisher.channel = "Script"

    torclient_host = '127.0.0.1'
    torclient_port = 9050

    config_section = 'Onion'

    p = Process(config_section)
    r_cache = redis.StrictRedis(
        host=p.config.get("Redis_Cache", "host"),
        port=p.config.getint("Redis_Cache", "port"),
        db=p.config.getint("Redis_Cache", "db"))

    # FUNCTIONS #
    publisher.info("Script subscribed to channel onion_categ")

    # FIXME For retro compatibility
    channel = 'onion_categ'

    # Getting the first message from redis.
    message = p.get_from_set()
    prec_filename = None

    # Thanks to Faup project for this regex
    # https://github.com/stricaud/faup
    url_regex = "((http|https|ftp)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.onion)(\:[0-9]+)*(/($|[a-zA-Z0-9\.\,\?\'\\\+&%\$#\=~_\-]+))*)"

    while True:
        if message is not None:
            print(message)
            filename, score = message.split()

            # "For each new paste"
            if prec_filename is None or filename != prec_filename:
                domains_list = []
                urls = []
                PST = Paste.Paste(filename)

                for x in PST.get_regex(url_regex):
                    # Extracting url with regex
                    url, s, credential, subdomain, domain, host, port, \
                        resource_path, query_string, f1, f2, f3, f4 = x

                    domains_list.append(domain)
                    urls.append(url)

                # Saving the list of extracted onion domains.
                PST.__setattr__(channel, domains_list)
                PST.save_attribute_redis(channel, domains_list)
                to_print = 'Onion;{};{};{};'.format(PST.p_source, PST.p_date,
                                                    PST.p_name)
                if len(domains_list) > 0:

                    publisher.warning('{}Detected {} .onion(s);{}'.format(
                        to_print, len(domains_list),PST.p_path))
                    now = datetime.datetime.now()
                    path = os.path.join('onions', str(now.year).zfill(4),
                                        str(now.month).zfill(2),
                                        str(now.day).zfill(2),
                                        str(int(time.mktime(now.utctimetuple()))))
                    to_print = 'Onion;{};{};{};'.format(PST.p_source,
                                                        PST.p_date,
                                                        PST.p_name)
                    for url in fetch(p, r_cache, urls, domains_list, path):
                        publisher.warning('{}Checked {};{}'.format(to_print, url, PST.p_path))
                        p.populate_set_out('onion;{}'.format(PST.p_path), 'alertHandler')
                else:
                    publisher.info('{}Onion related;{}'.format(to_print, PST.p_path))

            prec_filename = filename
        else:
            publisher.debug("Script url is Idling 10s")
            #print('Sleeping')
            time.sleep(10)
        message = p.get_from_set()