# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import dbus, os
from dbus.mainloop.glib import DBusGMainLoop

from autotest_lib.client.bin import test, utils
from autotest_lib.client.common_lib import error
from autotest_lib.client.common_lib.cros import policy, session_manager
from autotest_lib.client.cros import cryptohome, ownership


class login_MultiUserPolicy(test.test):
    """Verifies that storing and retrieving user policy works with
       multiple profiles signed-in.
    """

    version = 1

    _user1 = 'user1@somewhere.com'
    _user2 = 'user2@somewhere.com'

    def setup(self):
        os.chdir(self.srcdir)
        utils.make('OUT_DIR=.')


    def initialize(self):
        super(login_MultiUserPolicy, self).initialize()
        self._bus_loop = DBusGMainLoop(set_as_default=True)

        # Clear the user's vault, to make sure the test starts without any
        # policy or key lingering around. At this stage the session isn't
        # started and there's no user signed in.
        ownership.restart_ui_to_clear_ownership_files()
        cryptohome_proxy = cryptohome.CryptohomeProxy(self._bus_loop)
        cryptohome_proxy.ensure_clean_cryptohome_for(self._user1)
        cryptohome_proxy.ensure_clean_cryptohome_for(self._user2)


    def run_once(self):
        sm = session_manager.connect(self._bus_loop)

        # Start a session for the first user, and verify that no policy exists
        # for that user yet.
        if not sm.StartSession(self._user1, ''):
            raise error.TestError('Could not start session')
        policy_blob = sm.RetrievePolicyForUser(self._user1, byte_arrays=True)
        if policy_blob:
            raise error.TestError('session_manager already has user policy!')

        # Now store a policy. This is building a device policy protobuf, but
        # that's fine as far as the session_manager is concerned; it's the
        # outer PolicyFetchResponse that contains the public_key.
        public_key = ownership.known_pubkey()
        private_key = ownership.known_privkey()
        policy_data = policy.build_policy_data(self.srcdir)
        policy_response = policy.generate_policy(self.srcdir,
                                                 private_key,
                                                 public_key,
                                                 policy_data)
        try:
          result = sm.StorePolicyForUser(self._user1,
                                         dbus.ByteArray(policy_response))
          if not result:
              raise error.TestFail('Failed to store user policy')
        except dbus.exceptions.DBusException, e:
          raise error.TestFail('Call to StorePolicyForUser failed', e)

        # Storing policy for the second user fails before his session starts.
        try:
          result = sm.StorePolicyForUser(self._user2,
                                         dbus.ByteArray(policy_response))
          raise error.TestFail('Storing policy should fail before the session '
                               'is started')
        except dbus.exceptions.DBusException, e:
          pass

        # Now start the second user's session, and verify that he has no
        # policy stored yet.
        if not sm.StartSession(self._user2, ''):
            raise error.TestError('Could not start second session')
        policy_blob = sm.RetrievePolicyForUser(self._user2, byte_arrays=True)
        if policy_blob:
            raise error.TestError('session_manager already has user policy!')

        # Storing works now.
        try:
          result = sm.StorePolicyForUser(self._user2,
                                         dbus.ByteArray(policy_response))
          if not result:
              raise error.TestFail('Failed to store user policy')
        except dbus.exceptions.DBusException, e:
          raise error.TestFail('Call to StorePolicyForUser failed', e)

        # Verify that retrieving policy works too.
        policy_blob = sm.RetrievePolicyForUser(self._user2, byte_arrays=True)
        if not policy_blob:
            raise error.TestError('Failed to retrieve stored policy')