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+# -*- coding: utf-8 -*-
+# backend.py
+# Copyright (C) 2013 LEAP
+#
+# 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/>.
+"""
+Backend for everything
+"""
+import logging
+import os
+
+from Queue import Queue, Empty
+
+from twisted.internet import threads, defer
+from twisted.internet.task import LoopingCall
+from twisted.python import log
+
+import zope.interface
+
+from leap.bitmask.config.providerconfig import ProviderConfig
+from leap.bitmask.provider.providerbootstrapper import ProviderBootstrapper
+
+# Frontend side
+from PySide import QtCore
+
+logger = logging.getLogger(__name__)
+
+
+class ILEAPComponent(zope.interface.Interface):
+ """
+ Interface that every component for the backend should comply to
+ """
+
+ key = zope.interface.Attribute("Key id for this component")
+
+
+class ILEAPService(ILEAPComponent):
+ """
+ Interface that every Service needs to implement
+ """
+
+ def start(self):
+ """
+ Starts the service.
+ """
+ pass
+
+ def stop(self):
+ """
+ Stops the service.
+ """
+ pass
+
+ def terminate(self):
+ """
+ Terminates the service, not necessarily in a nice way.
+ """
+ pass
+
+ def status(self):
+ """
+ Returns a json object with the current status for the service.
+
+ :rtype: object (list, str, dict)
+ """
+ # XXX: Use a namedtuple or a specific object instead of a json
+ # object, since parsing it will be problematic otherwise.
+ # It has to be something easily serializable though.
+ pass
+
+ def set_configs(self, keyval):
+ """
+ Sets the config parameters for this Service.
+
+ :param keyval: values to configure
+ :type keyval: dict, {str: str}
+ """
+ pass
+
+ def get_configs(self, keys):
+ """
+ Returns the configuration values for the list of keys.
+
+ :param keys: keys to retrieve
+ :type keys: list of str
+
+ :rtype: dict, {str: str}
+ """
+ pass
+
+
+class Provider(object):
+ """
+ Interfaces with setup and bootstrapping operations for a provider
+ """
+
+ zope.interface.implements(ILEAPComponent)
+
+ PROBLEM_SIGNAL = "prov_problem_with_provider"
+
+ def __init__(self, signaler=None, bypass_checks=False):
+ """
+ Constructor for the Provider component
+
+ :param signaler: Object in charge of handling communication
+ back to the frontend
+ :type signaler: Signaler
+ :param bypass_checks: Set to true if the app should bypass
+ first round of checks for CA
+ certificates at bootstrap
+ :type bypass_checks: bool
+ """
+ object.__init__(self)
+ self.key = "provider"
+ self._provider_bootstrapper = ProviderBootstrapper(signaler,
+ bypass_checks)
+ self._download_provider_defer = None
+ self._provider_config = ProviderConfig()
+
+ def setup_provider(self, provider):
+ """
+ Initiates the setup for a provider
+
+ :param provider: URL for the provider
+ :type provider: unicode
+ """
+ log.msg("Setting up provider %s..." % (provider.encode("idna"),))
+ pb = self._provider_bootstrapper
+ d = pb.run_provider_select_checks(provider, download_if_needed=True)
+ self._download_provider_defer = d
+ return d
+
+ def bootstrap(self, provider):
+ """
+ Second stage of bootstrapping for a provider.
+
+ :param provider: URL for the provider
+ :type provider: unicode
+ """
+
+ d = None
+
+ # If there's no loaded provider or
+ # we want to connect to other provider...
+ if (not self._provider_config.loaded() or
+ self._provider_config.get_domain() != provider):
+ self._provider_config.load(
+ os.path.join("leap", "providers",
+ provider, "provider.json"))
+
+ if self._provider_config.loaded():
+ d = self._provider_bootstrapper.run_provider_setup_checks(
+ self._provider_config,
+ download_if_needed=True)
+ else:
+ if self._signaler is not None:
+ self._signaler.signal(self.PROBLEM_SIGNAL)
+ logger.error("Could not load provider configuration.")
+ self._login_widget.set_enabled(True)
+
+ if d is None:
+ d = defer.Deferred()
+ return d
+
+
+class Signaler(QtCore.QObject):
+ """
+ Signaler object, handles converting string commands to Qt signals.
+
+ This is intended for the separation in frontend/backend, this will
+ live in the frontend.
+ """
+
+ # Signals for the ProviderBootstrapper
+ # These will only exist in the frontend
+ prov_name_resolution = QtCore.Signal(object)
+ prov_https_connection = QtCore.Signal(object)
+ prov_download_provider_info = QtCore.Signal(object)
+
+ prov_download_ca_cert = QtCore.Signal(object)
+ prov_check_ca_fingerprint = QtCore.Signal(object)
+ prov_check_api_certificate = QtCore.Signal(object)
+
+ prov_problem_with_provider = QtCore.Signal(object)
+
+ # These will exist both in the backend and the front end.
+ # The frontend might choose to not "interpret" all the signals
+ # from the backend, but the backend needs to have all the signals
+ # it's going to emit defined here
+ PROV_NAME_RESOLUTION_KEY = "prov_name_resolution"
+ PROV_HTTPS_CONNECTION_KEY = "prov_https_connection"
+ PROV_DOWNLOAD_PROVIDER_INFO_KEY = "prov_download_provider_info"
+ PROV_DOWNLOAD_CA_CERT_KEY = "prov_download_ca_cert"
+ PROV_CHECK_CA_FINGERPRINT_KEY = "prov_check_ca_fingerprint"
+ PROV_CHECK_API_CERTIFICATE_KEY = "prov_check_api_certificate"
+ PROV_PROV_PROBLEM_WITH_PROVIER_KEY = "prov_problem_with_provider"
+
+ def __init__(self):
+ """
+ Constructor for the Signaler
+ """
+ QtCore.QObject.__init__(self)
+ self._signals = {}
+
+ signals = [
+ self.PROV_NAME_RESOLUTION_KEY,
+ self.PROV_HTTPS_CONNECTION_KEY,
+ self.PROV_DOWNLOAD_PROVIDER_INFO_KEY,
+ self.PROV_DOWNLOAD_CA_CERT_KEY,
+ self.PROV_CHECK_CA_FINGERPRINT_KEY,
+ self.PROV_CHECK_API_CERTIFICATE_KEY,
+ self.PROV_PROV_PROBLEM_WITH_PROVIER_KEY
+ ]
+
+ for sig in signals:
+ self._signals[sig] = getattr(self, sig)
+
+ def signal(self, key, data=None):
+ """
+ Emits a Qt signal based on the key provided, with the data if provided.
+
+ :param key: string identifying the signal to emit
+ :type key: str
+ :param data: object to send with the data
+ :type data: object
+
+ NOTE: The data object will be a serialized str in the backend,
+ and an unserialized object in the frontend, but for now we
+ just care about objects.
+ """
+ # Right now it emits Qt signals. The backend version of this
+ # will do zmq.send_multipart, and the frontend version will be
+ # similar to this
+ log.msg("Signaling %s :: %s" % (key, data))
+ try:
+ self._signals[key].emit(data)
+ except KeyError:
+ log.msg("Unknown key for signal %s!" % (key,))
+
+
+class Backend(object):
+ """
+ Backend for everything, the UI should only use this class.
+ """
+
+ PASSED_KEY = "passed"
+ ERROR_KEY = "error"
+
+ def __init__(self, bypass_checks=False):
+ """
+ Constructor for the backend.
+ """
+ object.__init__(self)
+
+ # Components map for the commands received
+ self._components = {}
+
+ # Ongoing defers that will be cancelled at stop time
+ self._ongoing_defers = []
+
+ # Signaler object to translate commands into Qt signals
+ self._signaler = Signaler()
+
+ # Component registration
+ self._register(Provider(self._signaler, bypass_checks))
+
+ # We have a looping call on a thread executing all the
+ # commands in queue. Right now this queue is an actual Queue
+ # object, but it'll become the zmq recv_multipart queue
+ self._lc = LoopingCall(threads.deferToThread, self._worker)
+
+ # Temporal call_queue for worker, will be replaced with
+ # recv_multipart os something equivalent in the loopingcall
+ self._call_queue = Queue()
+
+ @property
+ def signaler(self):
+ """
+ Public signaler access to let the UI connect to its signals.
+ """
+ return self._signaler
+
+ def start(self):
+ """
+ Starts the looping call
+ """
+ log.msg("Starting worker...")
+ self._lc.start(0.01)
+
+ def stop(self):
+ """
+ Stops the looping call and tries to cancel all the defers.
+ """
+ log.msg("Stopping worker...")
+ self._lc.stop()
+ while len(self._ongoing_defers) > 0:
+ d = self._ongoing_defers.pop()
+ d.cancel()
+
+ def _register(self, component):
+ """
+ Registers a component in this backend
+
+ :param component: Component to register
+ :type component: any object that implements ILEAPComponent
+ """
+ # TODO: assert that the component implements the interfaces
+ # expected
+ try:
+ self._components[component.key] = component
+ except Exception:
+ log.msg("There was a problem registering %s" % (component,))
+ log.err()
+
+ def _signal_back(self, _, signal):
+ """
+ Helper method to signal back (callback like behavior) to the
+ UI that an operation finished.
+
+ :param signal: signal name
+ :type signal: str
+ """
+ self._signaler.signal(signal)
+
+ def _worker(self):
+ """
+ Worker method, called from a different thread and as a part of
+ a looping call
+ """
+ try:
+ # this'll become recv_multipart
+ cmd = self._call_queue.get(block=False)
+
+ # cmd is: component, method, signalback, *args
+ func = getattr(self._components[cmd[0]], cmd[1])
+ d = func(*cmd[3:])
+ # A call might not have a callback signal, but if it does,
+ # we add it to the chain
+ if cmd[2] is not None:
+ d.addCallbacks(self._signal_back, log.err, cmd[2])
+ d.addCallbacks(self._done_action, log.err,
+ callbackKeywords={"d": d})
+ d.addErrback(log.err)
+ self._ongoing_defers.append(d)
+ except Empty:
+ # If it's just empty we don't have anything to do.
+ pass
+ except Exception:
+ # But we log the rest
+ log.err()
+
+ def _done_action(self, _, d):
+ """
+ Remover of the defer once it's done
+
+ :param d: defer to remove
+ :type d: twisted.internet.defer.Deferred
+ """
+ self._ongoing_defers.remove(d)
+
+ # XXX: Temporal interface until we migrate to zmq
+ # We simulate the calls to zmq.send_multipart. Once we separate
+ # this in two processes, the methods bellow can be changed to
+ # send_multipart and this backend class will be really simple.
+
+ def setup_provider(self, provider):
+ self._call_queue.put(("provider", "setup_provider", None, provider))
+
+ def provider_bootstrap(self, provider):
+ self._call_queue.put(("provider", "bootstrap", None, provider))