#!/usr/bin/env python3.5

import time, datetime
import copy
from collections import OrderedDict
from pprint import pprint
import zmq
import redis
import random
import configparser
import argparse
import os
import sys
import json
import geoip2.database

import util
import contributor_helper
import users_helper

configfile = os.path.join(os.environ['DASH_CONFIG'], 'config.cfg')
cfg = configparser.ConfigParser()
cfg.read(configfile)

ONE_DAY = 60*60*24
ZMQ_URL = cfg.get('RedisGlobal', 'zmq_url')
CHANNEL = cfg.get('RedisLog', 'channel')
CHANNEL_LASTCONTRIB = cfg.get('RedisLog', 'channelLastContributor')
CHANNEL_LASTAWARDS = cfg.get('RedisLog', 'channelLastAwards')
CHANNELDISP = cfg.get('RedisMap', 'channelDisp')
CHANNEL_PROC = cfg.get('RedisMap', 'channelProc')
PATH_TO_DB = cfg.get('RedisMap', 'pathMaxMindDB')


DEFAULT_PNTS_REWARD = cfg.get('CONTRIB', 'default_pnts_per_contribution')
categories_in_datatable = json.loads(cfg.get('CONTRIB', 'categories_in_datatable'))
DICO_PNTS_REWARD = {}
temp = json.loads(cfg.get('CONTRIB', 'pnts_per_contribution'))
for categ, pnts in temp:
    DICO_PNTS_REWARD[categ] = pnts
MAX_NUMBER_OF_LAST_CONTRIBUTOR = cfg.getint('CONTRIB', 'max_number_of_last_contributor')

serv_log = redis.StrictRedis(
        host=cfg.get('RedisGlobal', 'host'),
        port=cfg.getint('RedisGlobal', 'port'),
        db=cfg.getint('RedisLog', 'db'))
serv_coord = redis.StrictRedis(
        host=cfg.get('RedisGlobal', 'host'),
        port=cfg.getint('RedisGlobal', 'port'),
        db=cfg.getint('RedisMap', 'db'))
serv_redis_db = redis.StrictRedis(
        host=cfg.get('RedisGlobal', 'host'),
        port=cfg.getint('RedisGlobal', 'port'),
        db=cfg.getint('RedisDB', 'db'))

contributor_helper = contributor_helper.Contributor_helper(serv_redis_db, cfg)
users_helper = users_helper.Users_helper(serv_redis_db, cfg)

reader = geoip2.database.Reader(PATH_TO_DB)

def publish_log(zmq_name, name, content, channel=CHANNEL):
    to_send = { 'name': name, 'log': json.dumps(content), 'zmqName': zmq_name }
    serv_log.publish(channel, json.dumps(to_send))

def push_to_redis_zset(keyCateg, toAdd, endSubkey="", count=1):
    now = datetime.datetime.now()
    today_str = util.getDateStrFormat(now)
    keyname = "{}:{}{}".format(keyCateg, today_str, endSubkey)
    serv_redis_db.zincrby(keyname, toAdd, count)

def push_to_redis_geo(keyCateg, lon, lat, content):
    now = datetime.datetime.now()
    today_str = util.getDateStrFormat(now)
    keyname = "{}:{}".format(keyCateg, today_str)
    serv_redis_db.geoadd(keyname, lon, lat, content)

def ip_to_coord(ip):
    resp = reader.city(ip)
    lat = float(resp.location.latitude)
    lon = float(resp.location.longitude)
    # 0.0001 correspond to ~10m
    # Cast the float so that it has the correct float format
    lat_corrected = float("{:.4f}".format(lat))
    lon_corrected = float("{:.4f}".format(lon))
    return { 'coord': {'lat': lat_corrected, 'lon': lon_corrected}, 'full_rep': resp }

def getCoordAndPublish(zmq_name, supposed_ip, categ):
    try:
        rep = ip_to_coord(supposed_ip)
        coord = rep['coord']
        coord_dic = {'lat': coord['lat'], 'lon': coord['lon']}
        ordDic = OrderedDict() #keep fields with the same layout in redis
        ordDic['lat'] = coord_dic['lat']
        ordDic['lon'] = coord_dic['lon']
        coord_list = [coord['lat'], coord['lon']]
        push_to_redis_zset('GEO_COORD', json.dumps(ordDic))
        push_to_redis_zset('GEO_COUNTRY', rep['full_rep'].country.iso_code)
        ordDic = OrderedDict() #keep fields with the same layout in redis
        ordDic['categ'] = categ
        ordDic['value'] = supposed_ip
        push_to_redis_geo('GEO_RAD', coord['lon'], coord['lat'], json.dumps(ordDic))
        to_send = {
                "coord": coord,
                "categ": categ,
                "value": supposed_ip,
                "country": rep['full_rep'].country.name,
                "specifName": rep['full_rep'].subdivisions.most_specific.name,
                "cityName": rep['full_rep'].city.name,
                "regionCode": rep['full_rep'].country.iso_code,
                }
        serv_coord.publish(CHANNELDISP, json.dumps(to_send))
    except ValueError:
        print("can't resolve ip")
    except geoip2.errors.AddressNotFoundError:
        print("Address not in Database")

def getFields(obj, fields):
    jsonWalker = fields.split('.')
    itemToExplore = obj
    lastName = ""
    try:
        for i in jsonWalker:
            itemToExplore = itemToExplore[i]
            lastName = i
        if type(itemToExplore) is list:
            return { 'name': lastName , 'data': itemToExplore }
        else:
            return itemToExplore
    except KeyError as e:
        return ""

def noSpaceLower(text):
    return text.lower().replace(' ', '_')

#pntMultiplier if one contribution rewards more than others. (e.g. shighting may gives more points than editing)
def handleContribution(zmq_name, org, contribType, categ, action, pntMultiplier=1, eventTime=datetime.datetime.now(), isLabeled=False):
    if action in ['edit', None]:
        pass
        #return #not a contribution?

    now = datetime.datetime.now()
    nowSec = int(time.time())
    pnts_to_add = DEFAULT_PNTS_REWARD

    # is a valid contribution
    if categ is not None:
        try:
            pnts_to_add = DICO_PNTS_REWARD[noSpaceLower(categ)]
        except KeyError:
            pnts_to_add = DEFAULT_PNTS_REWARD
        pnts_to_add *= pntMultiplier

        push_to_redis_zset('CONTRIB_DAY', org, count=pnts_to_add)
        #CONTRIB_CATEG retain the contribution per category, not the point earned in this categ
        push_to_redis_zset('CONTRIB_CATEG', org, count=1, endSubkey=':'+noSpaceLower(categ))
        publish_log(zmq_name, 'CONTRIBUTION', {'org': org, 'categ': categ, 'action': action, 'epoch': nowSec }, channel=CHANNEL_LASTCONTRIB)
    else:
        categ = ""

    serv_redis_db.sadd('CONTRIB_ALL_ORG', org)

    serv_redis_db.zadd('CONTRIB_LAST:'+util.getDateStrFormat(now), nowSec, org)
    serv_redis_db.expire('CONTRIB_LAST:'+util.getDateStrFormat(now), ONE_DAY*7) #expire after 7 day

    awards_given = contributor_helper.updateOrgContributionRank(org, pnts_to_add, action, contribType, eventTime=datetime.datetime.now(), isLabeled=isLabeled, categ=noSpaceLower(categ))

    for award in awards_given:
        # update awards given
        serv_redis_db.zadd('CONTRIB_LAST_AWARDS:'+util.getDateStrFormat(now), nowSec, json.dumps({'org': org, 'award': award, 'epoch': nowSec }))
        serv_redis_db.expire('CONTRIB_LAST_AWARDS:'+util.getDateStrFormat(now), ONE_DAY*7) #expire after 7 day
        # publish
        publish_log(zmq_name, 'CONTRIBUTION', {'org': org, 'award': award, 'epoch': nowSec }, channel=CHANNEL_LASTAWARDS)


##############
## HANDLERS ##
##############

def handler_log(zmq_name, jsonevent):
    print('sending', 'log')
    return

def handler_dispatcher(zmq_name, jsonObj):
    if "Event" in jsonObj:
        handler_event(zmq_name, jsonObj)

def handler_keepalive(zmq_name, jsonevent):
    print('sending', 'keepalive')
    to_push = [ jsonevent['uptime'] ]
    publish_log(zmq_name, 'Keepalive', to_push)

def handler_user(zmq_name, jsondata):
    json_user = jsondata['User']
    userID = json_user['id']
    try: #only consider user login
        timestamp = json_user['current_login']
    except KeyError:
        return
    if timestamp != 0: # "invited_by": "xxxx" ???
        users_helper.add_user_login(timestamp)

def handler_conversation(zmq_name, jsonevent):
    try: #only consider POST, not THREAD
        jsonpost = jsonevent['Post']
    except KeyError:
        return
    print('sending' ,'Post')
    org = jsonpost['org_name']
    categ = None
    action = 'add'
    handleContribution(zmq_name, org,
                    'Discussion',
                    None,
                    action,
                    isLabeled=False)

def handler_object(zmq_name, jsondata):
    print('obj')
    return

def handler_sighting(zmq_name, jsondata):
    print('sending' ,'sighting')
    jsonsight = jsondata['Sighting']
    org = jsonsight['Event']['Orgc']['name']
    categ = jsonsight['Attribute']['category']
    try:
        action = jsondata['action']
    except KeyError:
        action = None
    handleContribution(zmq_name, org, 'Sighting', categ, action, pntMultiplier=2)
    handler_attribute(zmq_name, jsonsight, hasAlreadyBeenContributed=True)

def handler_event(zmq_name, jsonobj):
    #fields: threat_level_id, id, info
    jsonevent = jsonobj['Event']
    #redirect to handler_attribute
    if 'Attribute' in jsonevent:
        attributes = jsonevent['Attribute']
        if type(attributes) is list:
            for attr in attributes:
                jsoncopy = copy.deepcopy(jsonobj)
                jsoncopy['Attribute'] = attr
                handler_attribute(zmq_name, jsoncopy)
        else:
            handler_attribute(zmq_name, attributes)

    try:
        action = jsonobj['action']
    except KeyError:
        action = None
    try:
        eventLabeled = len(jsonobj['EventTag']) > 0
    except KeyError:
        eventLabeled = False
    try:
        org = jsonobj['Orgc']['name']
    except KeyError:
        org = None

    if org is not None:
        handleContribution(zmq_name, org,
                        'Event',
                        None,
                        action,
                        isLabeled=eventLabeled)

def handler_attribute(zmq_name, jsonobj, hasAlreadyBeenContributed=False):
    # check if jsonattr is an attribute object
    if 'Attribute' in jsonobj:
        jsonattr = jsonobj['Attribute']

    to_push = []
    for field in json.loads(cfg.get('Log', 'fieldname_order')):
        if type(field) is list:
            to_join = []
            for subField in field:
                to_join.append(getFields(jsonobj, subField))
            to_add = cfg.get('Log', 'char_separator').join(to_join)
        else:
            to_add = getFields(jsonobj, field)
        to_push.append(to_add)

    #try to get coord from ip
    if jsonattr['category'] == "Network activity":
        getCoordAndPublish(zmq_name, jsonattr['value'], jsonattr['category'])

    if not hasAlreadyBeenContributed:
        try:
            eventLabeled = len(jsonattr['Tag']) > 0
        except KeyError:
            eventLabeled = False
        try:
            action = jsonobj['action']
        except KeyError:
            action = None
        handleContribution(zmq_name, jsonobj['Event']['Orgc']['name'],
                            'Attribute',
                            jsonattr['category'],
                            action,
                            isLabeled=eventLabeled)
    # Push to log
    publish_log(zmq_name, 'Attribute', to_push)


###############
## MAIN LOOP ##
###############

def process_log(zmq_name, event):
    event = event.decode('utf8')
    topic, eventdata = event.split(' ', maxsplit=1)
    jsonevent = json.loads(eventdata)
    print(event)
    dico_action[topic](zmq_name, jsonevent)


def main(zmqName):
    context = zmq.Context()
    socket = context.socket(zmq.SUB)
    socket.connect(ZMQ_URL)
    socket.setsockopt_string(zmq.SUBSCRIBE, '')

    while True:
        content = socket.recv()
        content.replace(b'\n', b'') # remove \n...
        zmq_name = zmqName
        process_log(zmq_name, content)


dico_action = {
        "misp_json":                handler_dispatcher,
        "misp_json_event":          handler_event,
        "misp_json_self":           handler_keepalive,
        "misp_json_attribute":      handler_attribute,
        "misp_json_object":         handler_object,
        "misp_json_sighting":       handler_sighting,
        "misp_json_organisation":   handler_log,
        "misp_json_user":           handler_user,
        "misp_json_conversation":   handler_conversation
        }


if __name__ == "__main__":

    parser = argparse.ArgumentParser(description='A zmq subscriber. It subscribe to a ZNQ then redispatch it to the misp-dashboard')
    parser.add_argument('-n', '--name', required=False, dest='zmqname', help='The ZMQ feed name', default="MISP Standard ZMQ")
    parser.add_argument('-u', '--url', required=False, dest='zmqurl', help='The URL to connect to', default=ZMQ_URL)
    args = parser.parse_args()

    main(args.zmqname)
    reader.close()