# Ënnstatus

# Copyright (C) 2015  Dennis Fink

#

# 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 <http://www.gnu.org/licenses/>.

import ipaddress

import json

import functools

import statistics

from pathlib import Path

from datetime import datetime

import jsonschema

import strict_rfc3339

from flask import current_app

from pkg_resources import resource_filename

from onion_py.manager import Manager

from onion_py.caching import OnionSimpleCache

from ..utils import check_ip

schema = json.load(

    open(

        resource_filename('ennstatus.api', 'schema/server.json'),

        encoding='utf-8'

    )

)

validate = functools.partial(

    jsonschema.validate,

    schema=schema,

    format_checker=jsonschema.FormatChecker()

)

manager = Manager(OnionSimpleCache())

def calculate_weight(data):

    obj = {}

    for subkey in ('1_week', '1_month', '3_months', '1_year', '5_years'):

        try:

            subdata = data[subkey]

        except KeyError:

            continue

        factor = subdata.factor

        values = [x * factor for x in subdata.values if x is not None]

        if values:

            obj[subkey] = statistics.mean(values) * 100

        else:

            obj[subkey] = None

    return obj

class ServerEncoder(json.JSONEncoder):

    def default(self, obj):

        if isinstance(obj, (ipaddress.IPv4Address, ipaddress.IPv6Address)):

            return str(obj)

        if isinstance(obj, datetime):

            return strict_rfc3339.timestamp_to_rfc3339_utcoffset(

                obj.timestamp()

            )

        return json.JSONEncoder.default(self, obj)

class ServerDecoder(json.JSONDecoder):

    def decode(self, json_string):

        default_obj = super().decode(json_string)

        for key in ('ip', 'ip6'):

            if key in default_obj:

                current_app.logger.debug('{}: {}'.format(

                    key, default_obj[key]

                )

                )

                default_obj[key] = ipaddress.ip_address(default_obj[key])

        current_app.logger.debug('Loading last_updated')

        default_obj['last_updated'] = datetime.fromtimestamp(

            strict_rfc3339.rfc3339_to_timestamp(default_obj['last_updated'])

        )

        return default_obj

class Server:

    def __init__(self, *args, **kwargs):

        self.name = kwargs['name']

        self.type = kwargs['type']

        self.status = kwargs.get('status')

        self.fingerprint = kwargs['fingerprint']

        self.last_updated = kwargs['last_updated']

        self.country = kwargs['country']

        self.bandwidth = kwargs.get('bandwidth')

        self.flags = kwargs.get('flags')

        if self.type == 'bridge':

            self.obfs = kwargs.get('obfs')

            self.fteproxy = kwargs.get('fteproxy')

            self.flashproxy = kwargs.get('flashproxy')

            self.meek = kwargs.get('meek')

        else:

            self.ip = kwargs['ip']

            if 'ip6' in kwargs:

                self.ip6 = kwargs['ip6']

            default_weights = {

                '1_week': None,

                '1_month': None,

                '3_months': None,

                '1_year': None,

                '5_years': None

            }

            self.mean_consensus_weight = kwargs.get(

                'mean_consensus_weight',

                default_weights

            )

            self.mean_guard_probability = kwargs.get(

                'mean_guard_probability',

                default_weights

            )

            self.mean_exit_probability = kwargs.get(

                'mean_exit_probability',

                default_weights

            )

            self.mean_consensus_weight_fraction = kwargs.get(

                'mean_consensus_weight_fraction',

                default_weights

            )

            self.mean_middle_probability = kwargs.get(

                'mean_middle_probability',

                default_weights

            )

    @classmethod

    def from_file_by_name(cls, name):

        filepath = Path('data') / (name.lower() + '.json')

        current_app.logger.info('Loading {}'.format(str(filepath)))

        if filepath.exists() and filepath.is_file():

            try:

                with filepath.open(encoding='utf-8') as f:

                    data = json.load(f, cls=ServerDecoder)

            except (IOError, ValueError):

                current_app.logger.error('IOError or ValueError')

                return False

            else:

                return cls(**data)

        else:

            current_app.logger.error('File error!')

            return False

    @classmethod

    def from_json(cls, server):

        try:

            if cls.check_json_format(json.loads(server)):

                decoded = json.loads(server, cls=ServerDecoder)

                return cls(**decoded)

        except (jsonschema.ValidationError, ValueError) as e:

            raise e

    @classmethod

    def from_dict(cls, server):

        return cls.from_json(json.dumps(server))

    def json(self):

        return json.dumps(self.__dict__, cls=ServerEncoder)

    @staticmethod

    def check_json_format(server):

        try:

            validate(server)

        except jsonschema.ValidationError as e:

            raise e

        for key in ('ip', 'ip6'):

            if key in server:

                address = ipaddress.ip_address(server[key])

                if not check_ip(address):

                    raise ValueError('{} is not accepted!\n'.format(key))

        return True

    def save(self):

        filepath = Path('data') / (self.name.lower() + '.json')

        try:

            with filepath.open(mode='w', encoding='utf-8') as f:

                json.dump(self.__dict__, f, cls=ServerEncoder)

        except Exception as e:

            raise e

    def update_weights(self):

        if self.type not in ('exit', 'relay'):

            raise NotImplementedError

        try:

            data = manager.query('weights', lookup=self.fingerprint)

        except:

            raise NotImplementedError

        if data is not None:

            data = data.relays[0]

        self.mean_consensus_weight = calculate_weight(data.consensus_weight)

        self.mean_exit_probability = calculate_weight(data.exit_probability)

        self.mean_guard_probability = calculate_weight(

            data.guard_probability

        )

        self.mean_middle_probability = calculate_weight(

            data.middle_probability

        )

        self.mean_consensus_weight_fraction = calculate_weight(

            data.consensus_weight_fraction

        )

    def update_flags(self):

        try:

            data = manager.query('details', lookup=self.fingerprint)

        except:

            raise NotImplementedError

        if data is not None:

            self.flags = data.relays[0].flags

        else:

            raise NotImplementedError

    def check_status(self):

        now = datetime.utcnow()

        delta = now - self.last_updated

        if delta.seconds >= 3600:

            self.status = False

        elif delta.seconds >= 600:

            self.status = None

from setuptools import setup, find_packages

def _get_requirements():

    with open('requirements.in', encoding='utf-8') as f:

        lines = f.readlines()

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

    return lines

setup(name='Ennstatus',

      description=('Ennstatus provides the user with vital information about '

                   'the status of the organizations Tor servers.'),

      author='Frënn vun der Ënn',

      author_email='info@enn.lu',

      url='https://bitbucket.org/fvde/ennstatus',

      license='GPLv3+',

      packages=find_packages(),

      install_requires=_get_requirements(),

      include_package_data=True,

      entry_points={

          'console_scripts': [

              'ennstatuscli = ennstatus.cli:cli',

          ]

      },

      classifiers=['Development Status :: 5 - Production/Stable',

                   'Environment :: Web Environment',

                   'Operating System :: POSIX',

                   'Programming Language :: Python',

                   'Programming Language :: Python :: 3',

                   'Programming Language :: Python :: 3.3',

                   'Topic :: Internet',

                   'Topic :: Internet :: WWW/HTTP',

                   'Topic :: Internet :: WWW/HTTP :: Dynamic Content',

                   'Topic :: Internet :: WWW/HTTP :: WSGI',

                   'Topic :: Internet :: WWW/HTTP :: WSGI :: Application',

                   ('License :: OSI Approved :: '

                    'GNU General Public License v3 or later (GPLv3+)'),

                   ]

      )