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#
# Copyright (c) 2015 ThoughtWorks, Inc.
#
# Pixelated is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pixelated 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.

import os

from OpenSSL import SSL
from OpenSSL import crypto
from leap.common.events import (server as events_server,
                                register, catalog as events)
from leap.soledad.common.errors import InvalidAuthTokenError
from twisted.logger import Logger
from twisted.conch import manhole_tap
from twisted.cred import portal
from twisted.cred.checkers import AllowAnonymousAccess
from twisted.internet import defer
from twisted.internet import reactor
from twisted.internet import ssl

from pixelated.adapter.welcome_mail import add_welcome_mail
from pixelated.authentication import Authenticator
from pixelated.config import arguments
from pixelated.config import logger
from pixelated.config import services
from pixelated.config.leap import initialize_leap_single_user, init_monkeypatches, initialize_leap_provider
from pixelated.config.services import ServicesFactory, SingleUserServicesFactory
from pixelated.config.site import PixelatedSite
from pixelated.resources.auth import PixelatedRealm, PixelatedAuthSessionWrapper, SessionChecker
from pixelated.resources.login_resource import LoginResource
from pixelated.resources.root_resource import RootResource

log = Logger()


class UserAgentMode(object):
    def __init__(self, is_single_user):
        self.is_single_user = is_single_user


@defer.inlineCallbacks
def start_user_agent_in_single_user_mode(root_resource, services_factory, leap_home, leap_session):
    log.info('Bootstrap done, loading services for user %s' % leap_session.user_auth.username)

    _services = services.Services(leap_session)
    yield _services.setup()

    if leap_session.fresh_account:
        yield add_welcome_mail(leap_session.mail_store)

    services_factory.add_session(leap_session.user_auth.uuid, _services)

    authenticator = Authenticator(leap_session.provider)
    root_resource.initialize(provider=leap_session.provider, authenticator=authenticator)

    # soledad needs lots of threads
    reactor.getThreadPool().adjustPoolsize(5, 15)
    log.info('Done, the user agent is ready to be used')


def _ssl_options(sslkey, sslcert):
    with open(sslkey) as keyfile:
        pkey = crypto.load_privatekey(crypto.FILETYPE_PEM, keyfile.read())
    with open(sslcert) as certfile:
        cert = crypto.load_certificate(crypto.FILETYPE_PEM, certfile.read())

    acceptable = ssl.AcceptableCiphers.fromOpenSSLCipherString(
        u'ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:!RC4:HIGH:!MD5:!aNULL:!EDH')
    options = ssl.CertificateOptions(privateKey=pkey,
                                     certificate=cert,
                                     method=SSL.TLSv1_2_METHOD,
                                     acceptableCiphers=acceptable)
    return options


def _create_service_factory(args):
    if args.single_user:
        return SingleUserServicesFactory(UserAgentMode(is_single_user=True))
    else:
        return ServicesFactory(UserAgentMode(is_single_user=False))


def initialize():
    log.info('Starting the Pixelated user agent')
    args = arguments.parse_user_agent_args()
    logger.init(debug=args.debug)
    services_factory = _create_service_factory(args)
    resource = RootResource(services_factory)

    def start():
        start_async = _start_mode(args, resource, services_factory)
        add_top_level_system_callbacks(start_async, services_factory)

    log.info('Running the reactor')
    reactor.callWhenRunning(start)
    reactor.run()


def add_top_level_system_callbacks(deferred, services_factory):

    def _quit_on_error(failure):
        failure.printTraceback()
        reactor.stop()

    def _log_user_out(event, user_data):
        log.info('Invalid soledad token, logging out %s' % user_data)
        user_data = {'user_id': user_data['uuid']} if 'uuid' in user_data else {'user_id': user_data, 'using_email': True}
        services_factory.destroy_session(**user_data)

    def _log_user_out_on_token_expire(leap_session):
        register(events.SOLEDAD_INVALID_AUTH_TOKEN, _log_user_out)
        return leap_session

    deferred.addCallback(_log_user_out_on_token_expire)
    deferred.addErrback(_quit_on_error)


def _start_mode(args, resource, services_factory):
    if services_factory.mode.is_single_user:
        deferred = _start_in_single_user_mode(args, resource, services_factory)
    else:
        deferred = _start_in_multi_user_mode(args, resource, services_factory)
    return deferred


def _start_in_multi_user_mode(args, root_resource, services_factory):
    try:
        protected_resources = _setup_multi_user(args, root_resource, services_factory)
        start_site(args, protected_resources)
        reactor.getThreadPool().adjustPoolsize(5, 15)
        return defer.succeed(None)
    except Exception as e:
        return defer.fail(e)


def _setup_multi_user(args, root_resource, services_factory):
    if args.provider is None:
        raise ValueError('Multi-user mode: provider name is required')
    init_monkeypatches()
    events_server.ensure_server()
    provider = initialize_leap_provider(args.provider, args.leap_provider_cert, args.leap_provider_cert_fingerprint, args.leap_home)
    protected_resource = set_up_protected_resources(root_resource, provider, services_factory, banner=args.banner)
    return protected_resource


def set_up_protected_resources(root_resource, provider, services_factory, banner=None, authenticator=None):
    auth = authenticator or Authenticator(provider)
    session_checker = SessionChecker(services_factory)

    realm = PixelatedRealm()
    _portal = portal.Portal(realm, [session_checker, AllowAnonymousAccess()])

    anonymous_resource = LoginResource(services_factory, provider, disclaimer_banner=banner, authenticator=auth)
    protected_resource = PixelatedAuthSessionWrapper(_portal, root_resource, anonymous_resource, [])
    root_resource.initialize(provider, disclaimer_banner=banner, authenticator=auth)
    return protected_resource


def _start_in_single_user_mode(args, resource, services_factory):
    start_site(args, resource)
    deferred = initialize_leap_single_user(args.leap_provider_cert,
                                           args.leap_provider_cert_fingerprint,
                                           args.credentials_file,
                                           args.leap_home)

    def _handle_error(exception):
        if(exception.type is InvalidAuthTokenError):
            log.critical('Got an invalid soledad token, the user agent can\'t synchronize data, exiting')
            os._exit(1)
        else:
            exception.raiseException()

    deferred.addCallbacks(
        lambda leap_session: start_user_agent_in_single_user_mode(
            resource,
            services_factory,
            args.leap_home,
            leap_session), _handle_error)
    return deferred


def start_site(config, resource):
    log.info('Starting the API on port %s' % config.port)

    if config.manhole:
        log.info('Starting the manhole on port 8008')

        multiService = manhole_tap.makeService(dict(namespace=globals(),
                                                    telnetPort='8008',
                                                    sshPort='8009',
                                                    sshKeyDir='sshKeyDir',
                                                    sshKeyName='id_rsa',
                                                    sshKeySize=4096,
                                                    passwd='passwd'))
        telnetService, sshService = multiService.services
        telnetFactory = telnetService.factory
        sshFactory = sshService.factory

        reactor.listenTCP(8008, telnetFactory, interface='localhost')
        reactor.listenTCP(8009, sshFactory, interface='localhost')

    site = PixelatedSite(resource)
    site.displayTracebacks = False
    if config.sslkey and config.sslcert:
        reactor.listenSSL(config.port, site, _ssl_options(config.sslkey, config.sslcert),
                          interface=config.host)
    else:
        reactor.listenTCP(config.port, site, interface=config.host)