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"""
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 <https://www.gnu.org/licenses/>.

Copyright © 2019 Cloud Linux Software Inc.

This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
"""
import itertools
import logging
import time

from peewee import (
    CharField,
    FloatField,
    IntegerField,
    TextField,
)

from defence360agent.model import instance, Model

logger = logging.getLogger(__name__)


class InfectedDomainList(Model):
    """Domains with bad reputation, used for Reputation Management feature."""

    id = IntegerField(primary_key=True)
    #: Username associated with the domain in hosting panel.
    username = CharField(null=True)
    #: Domain name.
    name = CharField(null=False)
    #: The kind of threat reported by reputation engine,
    #: e.g. "SOCIAL_ENGINEERING".
    threat_type = CharField(null=False)
    #: The time when Imunify first detected that the domain has bad reputation.
    timestamp = FloatField()
    #: The name of the reputation engine, e.g. "google-safe-browsing".
    vendor = TextField(null=True)

    class Meta:
        database = instance.db
        db_table = 'infected_domain_list'

    @classmethod
    def get_by_user(cls, existing_users, offset=0, limit=50):
        # to be able to filter query results using existing_users,
        # limit/offset os applied on python side
        query = cls.select().order_by(
            cls.username, cls.name, cls.timestamp.desc())
        filtered_by_user = (row for row in query.dicts()
                            if row['username'] in existing_users)
        grouped = itertools.groupby(
            filtered_by_user,
            key=lambda row: (row['username'], row['name']))

        max_count = 0
        result = []
        for i, value in enumerate(grouped):
            max_count += 1
            if (len(result) < limit) and (i >= offset):
                group, threats = value
                username, name = group
                result.append({
                    'username': username,
                    'domain': name,
                    'threats': [{'type': t['threat_type'],
                                 'vendor': t['vendor'],
                                 'timestamp': t['timestamp']}
                                for t in threats]
                })
        return result, max_count

    @classmethod
    def refresh_domains(cls, domains, domains_to_users):
        """
        Update domain reputatuion info. If threat info already exists, do not
        update timestamp

        :param domains: reputation data from server
        :param domains_to_users: domain -> users mapping from hosting panel
        :return:
        """
        existing = {(r['name'], r['threat_type'], r['vendor']): r['timestamp']
                    for r in cls.select().dicts()}
        with instance.db.atomic():
            cls.delete().execute()
            now = time.time()
            for domain_info in domains:
                domain = domain_info['query']
                if domain not in domains_to_users:
                    logger.warning('Users for domain %s not found.', domain)
                    continue
                for user in domains_to_users[domain]:
                    vendor = domain_info['vendor']
                    if vendor in ('google-safe-browsing',
                                  'yandex-safe-browsing'):
                        threat_type = domain_info['details']['threat_type']
                    elif vendor == 'spamhaus':
                        threat_type = domain_info['details']
                    elif vendor in ('phishtank', 'openphish'):
                        # https://cloudlinux.atlassian.net/wiki/spaces/IPT/pages/929759302/4.1+Multiple+vendors+in+Reputation+Management+ver.4.2 # noqa: E501
                        threat_type = 'spam domain'
                    else:
                        threat_type = 'THREAT_TYPE_UNSPECIFIED'
                    timestamp = existing.get((domain, threat_type, vendor),
                                             now)
                    cls.create(username=user,
                               name=domain,
                               threat_type=threat_type,
                               vendor=vendor,
                               timestamp=timestamp)

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