summaryrefslogtreecommitdiffstats
path: root/keystone-moon/keystone/assignment/controllers.py
blob: bbaf94373b6b3cc46e334b22ff4fdd4c9cb19c32 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
# Copyright 2013 Metacloud, Inc.
# Copyright 2012 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

"""Workflow Logic the Assignment service."""

import functools
import uuid

from oslo_config import cfg
from oslo_log import log
from six.moves import urllib

from keystone.assignment import schema
from keystone.common import controller
from keystone.common import dependency
from keystone.common import utils
from keystone.common import validation
from keystone import exception
from keystone.i18n import _
from keystone import notifications


CONF = cfg.CONF
LOG = log.getLogger(__name__)


@dependency.requires('assignment_api', 'identity_api', 'token_provider_api')
class TenantAssignment(controller.V2Controller):
    """The V2 Project APIs that are processing assignments."""

    @controller.v2_deprecated
    def get_projects_for_token(self, context, **kw):
        """Get valid tenants for token based on token used to authenticate.

        Pulls the token from the context, validates it and gets the valid
        tenants for the user in the token.

        Doesn't care about token scopedness.

        """
        token_ref = utils.get_token_ref(context)

        tenant_refs = (
            self.assignment_api.list_projects_for_user(token_ref.user_id))
        tenant_refs = [self.v3_to_v2_project(ref) for ref in tenant_refs
                       if ref['domain_id'] == CONF.identity.default_domain_id]
        params = {
            'limit': context['query_string'].get('limit'),
            'marker': context['query_string'].get('marker'),
        }
        return self.format_project_list(tenant_refs, **params)

    @controller.v2_deprecated
    def get_project_users(self, context, tenant_id, **kw):
        self.assert_admin(context)
        user_refs = []
        user_ids = self.assignment_api.list_user_ids_for_project(tenant_id)
        for user_id in user_ids:
            try:
                user_ref = self.identity_api.get_user(user_id)
            except exception.UserNotFound:
                # Log that user is missing and continue on.
                message = ("User %(user_id)s in project %(project_id)s "
                           "doesn't exist.")
                LOG.debug(message,
                          {'user_id': user_id, 'project_id': tenant_id})
            else:
                user_refs.append(self.v3_to_v2_user(user_ref))
        return {'users': user_refs}


@dependency.requires('assignment_api', 'role_api')
class Role(controller.V2Controller):
    """The Role management APIs."""

    @controller.v2_deprecated
    def get_role(self, context, role_id):
        self.assert_admin(context)
        return {'role': self.role_api.get_role(role_id)}

    @controller.v2_deprecated
    def create_role(self, context, role):
        role = self._normalize_dict(role)
        self.assert_admin(context)

        if 'name' not in role or not role['name']:
            msg = _('Name field is required and cannot be empty')
            raise exception.ValidationError(message=msg)

        if role['name'] == CONF.member_role_name:
            # Use the configured member role ID when creating the configured
            # member role name. This avoids the potential of creating a
            # "member" role with an unexpected ID.
            role_id = CONF.member_role_id
        else:
            role_id = uuid.uuid4().hex

        role['id'] = role_id
        initiator = notifications._get_request_audit_info(context)
        role_ref = self.role_api.create_role(role_id, role, initiator)
        return {'role': role_ref}

    @controller.v2_deprecated
    def delete_role(self, context, role_id):
        self.assert_admin(context)
        initiator = notifications._get_request_audit_info(context)
        self.role_api.delete_role(role_id, initiator)

    @controller.v2_deprecated
    def get_roles(self, context):
        self.assert_admin(context)
        return {'roles': self.role_api.list_roles()}


@dependency.requires('assignment_api', 'resource_api', 'role_api')
class RoleAssignmentV2(controller.V2Controller):
    """The V2 Role APIs that are processing assignments."""

    # COMPAT(essex-3)
    @controller.v2_deprecated
    def get_user_roles(self, context, user_id, tenant_id=None):
        """Get the roles for a user and tenant pair.

        Since we're trying to ignore the idea of user-only roles we're
        not implementing them in hopes that the idea will die off.

        """
        self.assert_admin(context)
        roles = self.assignment_api.get_roles_for_user_and_project(
            user_id, tenant_id)
        return {'roles': [self.role_api.get_role(x)
                          for x in roles]}

    @controller.v2_deprecated
    def add_role_to_user(self, context, user_id, role_id, tenant_id=None):
        """Add a role to a user and tenant pair.

        Since we're trying to ignore the idea of user-only roles we're
        not implementing them in hopes that the idea will die off.

        """
        self.assert_admin(context)
        if tenant_id is None:
            raise exception.NotImplemented(
                message=_('User roles not supported: tenant_id required'))

        self.assignment_api.add_role_to_user_and_project(
            user_id, tenant_id, role_id)

        role_ref = self.role_api.get_role(role_id)
        return {'role': role_ref}

    @controller.v2_deprecated
    def remove_role_from_user(self, context, user_id, role_id, tenant_id=None):
        """Remove a role from a user and tenant pair.

        Since we're trying to ignore the idea of user-only roles we're
        not implementing them in hopes that the idea will die off.

        """
        self.assert_admin(context)
        if tenant_id is None:
            raise exception.NotImplemented(
                message=_('User roles not supported: tenant_id required'))

        # This still has the weird legacy semantics that adding a role to
        # a user also adds them to a tenant, so we must follow up on that
        self.assignment_api.remove_role_from_user_and_project(
            user_id, tenant_id, role_id)

    # COMPAT(diablo): CRUD extension
    @controller.v2_deprecated
    def get_role_refs(self, context, user_id):
        """Ultimate hack to get around having to make role_refs first-class.

        This will basically iterate over the various roles the user has in
        all tenants the user is a member of and create fake role_refs where
        the id encodes the user-tenant-role information so we can look
        up the appropriate data when we need to delete them.

        """
        self.assert_admin(context)
        tenants = self.assignment_api.list_projects_for_user(user_id)
        o = []
        for tenant in tenants:
            # As a v2 call, we should limit the response to those projects in
            # the default domain.
            if tenant['domain_id'] != CONF.identity.default_domain_id:
                continue
            role_ids = self.assignment_api.get_roles_for_user_and_project(
                user_id, tenant['id'])
            for role_id in role_ids:
                ref = {'roleId': role_id,
                       'tenantId': tenant['id'],
                       'userId': user_id}
                ref['id'] = urllib.parse.urlencode(ref)
                o.append(ref)
        return {'roles': o}

    # COMPAT(diablo): CRUD extension
    @controller.v2_deprecated
    def create_role_ref(self, context, user_id, role):
        """This is actually used for adding a user to a tenant.

        In the legacy data model adding a user to a tenant required setting
        a role.

        """
        self.assert_admin(context)
        # TODO(termie): for now we're ignoring the actual role
        tenant_id = role.get('tenantId')
        role_id = role.get('roleId')
        self.assignment_api.add_role_to_user_and_project(
            user_id, tenant_id, role_id)

        role_ref = self.role_api.get_role(role_id)
        return {'role': role_ref}

    # COMPAT(diablo): CRUD extension
    @controller.v2_deprecated
    def delete_role_ref(self, context, user_id, role_ref_id):
        """This is actually used for deleting a user from a tenant.

        In the legacy data model removing a user from a tenant required
        deleting a role.

        To emulate this, we encode the tenant and role in the role_ref_id,
        and if this happens to be the last role for the user-tenant pair,
        we remove the user from the tenant.

        """
        self.assert_admin(context)
        # TODO(termie): for now we're ignoring the actual role
        role_ref_ref = urllib.parse.parse_qs(role_ref_id)
        tenant_id = role_ref_ref.get('tenantId')[0]
        role_id = role_ref_ref.get('roleId')[0]
        self.assignment_api.remove_role_from_user_and_project(
            user_id, tenant_id, role_id)


@dependency.requires('assignment_api', 'resource_api')
class ProjectAssignmentV3(controller.V3Controller):
    """The V3 Project APIs that are processing assignments."""

    collection_name = 'projects'
    member_name = 'project'

    def __init__(self):
        super(ProjectAssignmentV3, self).__init__()
        self.get_member_from_driver = self.resource_api.get_project

    @controller.filterprotected('enabled', 'name')
    def list_user_projects(self, context, filters, user_id):
        hints = ProjectAssignmentV3.build_driver_hints(context, filters)
        refs = self.assignment_api.list_projects_for_user(user_id,
                                                          hints=hints)
        return ProjectAssignmentV3.wrap_collection(context, refs, hints=hints)


@dependency.requires('role_api')
class RoleV3(controller.V3Controller):
    """The V3 Role CRUD APIs."""

    collection_name = 'roles'
    member_name = 'role'

    def __init__(self):
        super(RoleV3, self).__init__()
        self.get_member_from_driver = self.role_api.get_role

    @controller.protected()
    @validation.validated(schema.role_create, 'role')
    def create_role(self, context, role):
        if role['name'] == CONF.member_role_name:
            # Use the configured member role ID when creating the configured
            # member role name. This avoids the potential of creating a
            # "member" role with an unexpected ID.
            role['id'] = CONF.member_role_id
        else:
            role = self._assign_unique_id(role)

        ref = self._normalize_dict(role)

        initiator = notifications._get_request_audit_info(context)
        ref = self.role_api.create_role(ref['id'], ref, initiator)
        return RoleV3.wrap_member(context, ref)

    @controller.filterprotected('name')
    def list_roles(self, context, filters):
        hints = RoleV3.build_driver_hints(context, filters)
        refs = self.role_api.list_roles(
            hints=hints)
        return RoleV3.wrap_collection(context, refs, hints=hints)

    @controller.protected()
    def get_role(self, context, role_id):
        ref = self.role_api.get_role(role_id)
        return RoleV3.wrap_member(context, ref)

    @controller.protected()
    @validation.validated(schema.role_update, 'role')
    def update_role(self, context, role_id, role):
        self._require_matching_id(role_id, role)
        initiator = notifications._get_request_audit_info(context)
        ref = self.role_api.update_role(role_id, role, initiator)
        return RoleV3.wrap_member(context, ref)

    @controller.protected()
    def delete_role(self, context, role_id):
        initiator = notifications._get_request_audit_info(context)
        self.role_api.delete_role(role_id, initiator)


@dependency.requires('assignment_api', 'identity_api', 'resource_api',
                     'role_api')
class GrantAssignmentV3(controller.V3Controller):
    """The V3 Grant Assignment APIs."""

    collection_name = 'roles'
    member_name = 'role'

    def __init__(self):
        super(GrantAssignmentV3, self).__init__()
        self.get_member_from_driver = self.role_api.get_role

    def _require_domain_xor_project(self, domain_id, project_id):
        if domain_id and project_id:
            msg = _('Specify a domain or project, not both')
            raise exception.ValidationError(msg)
        if not domain_id and not project_id:
            msg = _('Specify one of domain or project')
            raise exception.ValidationError(msg)

    def _require_user_xor_group(self, user_id, group_id):
        if user_id and group_id:
            msg = _('Specify a user or group, not both')
            raise exception.ValidationError(msg)
        if not user_id and not group_id:
            msg = _('Specify one of user or group')
            raise exception.ValidationError(msg)

    def _check_if_inherited(self, context):
        return (CONF.os_inherit.enabled and
                context['path'].startswith('/OS-INHERIT') and
                context['path'].endswith('/inherited_to_projects'))

    def _check_grant_protection(self, context, protection, role_id=None,
                                user_id=None, group_id=None,
                                domain_id=None, project_id=None,
                                allow_no_user=False):
        """Check protection for role grant APIs.

        The policy rule might want to inspect attributes of any of the entities
        involved in the grant.  So we get these and pass them to the
        check_protection() handler in the controller.

        """
        ref = {}
        if role_id:
            ref['role'] = self.role_api.get_role(role_id)
        if user_id:
            try:
                ref['user'] = self.identity_api.get_user(user_id)
            except exception.UserNotFound:
                if not allow_no_user:
                    raise
        else:
            ref['group'] = self.identity_api.get_group(group_id)

        if domain_id:
            ref['domain'] = self.resource_api.get_domain(domain_id)
        else:
            ref['project'] = self.resource_api.get_project(project_id)

        self.check_protection(context, protection, ref)

    @controller.protected(callback=_check_grant_protection)
    def create_grant(self, context, role_id, user_id=None,
                     group_id=None, domain_id=None, project_id=None):
        """Grants a role to a user or group on either a domain or project."""
        self._require_domain_xor_project(domain_id, project_id)
        self._require_user_xor_group(user_id, group_id)

        self.assignment_api.create_grant(
            role_id, user_id, group_id, domain_id, project_id,
            self._check_if_inherited(context), context)

    @controller.protected(callback=_check_grant_protection)
    def list_grants(self, context, user_id=None,
                    group_id=None, domain_id=None, project_id=None):
        """Lists roles granted to user/group on either a domain or project."""
        self._require_domain_xor_project(domain_id, project_id)
        self._require_user_xor_group(user_id, group_id)

        refs = self.assignment_api.list_grants(
            user_id, group_id, domain_id, project_id,
            self._check_if_inherited(context))
        return GrantAssignmentV3.wrap_collection(context, refs)

    @controller.protected(callback=_check_grant_protection)
    def check_grant(self, context, role_id, user_id=None,
                    group_id=None, domain_id=None, project_id=None):
        """Checks if a role has been granted on either a domain or project."""
        self._require_domain_xor_project(domain_id, project_id)
        self._require_user_xor_group(user_id, group_id)

        self.assignment_api.get_grant(
            role_id, user_id, group_id, domain_id, project_id,
            self._check_if_inherited(context))

    # NOTE(lbragstad): This will allow users to clean up role assignments
    # from the backend in the event the user was removed prior to the role
    # assignment being removed.
    @controller.protected(callback=functools.partial(
        _check_grant_protection, allow_no_user=True))
    def revoke_grant(self, context, role_id, user_id=None,
                     group_id=None, domain_id=None, project_id=None):
        """Revokes a role from user/group on either a domain or project."""
        self._require_domain_xor_project(domain_id, project_id)
        self._require_user_xor_group(user_id, group_id)

        self.assignment_api.delete_grant(
            role_id, user_id, group_id, domain_id, project_id,
            self._check_if_inherited(context), context)


@dependency.requires('assignment_api', 'identity_api', 'resource_api')
class RoleAssignmentV3(controller.V3Controller):
    """The V3 Role Assignment APIs, really just list_role_assignment()."""

    # TODO(henry-nash): The current implementation does not provide a full
    # first class entity for role-assignment. There is no role_assignment_id
    # and only the list_role_assignment call is supported. Further, since it
    # is not a first class entity, the links for the individual entities
    # reference the individual role grant APIs.

    collection_name = 'role_assignments'
    member_name = 'role_assignment'

    @classmethod
    def wrap_member(cls, context, ref):
        # NOTE(henry-nash): Since we are not yet a true collection, we override
        # the wrapper as have already included the links in the entities
        pass

    def _format_entity(self, context, entity):
        """Format an assignment entity for API response.

        The driver layer returns entities as dicts containing the ids of the
        actor (e.g. user or group), target (e.g. domain or project) and role.
        If it is an inherited role, then this is also indicated. Examples:

        For a non-inherited expanded assignment from group membership:
        {'user_id': user_id,
         'project_id': project_id,
         'role_id': role_id,
         'indirect': {'group_id': group_id}}

        or, for a project inherited role:

        {'user_id': user_id,
         'project_id': project_id,
         'role_id': role_id,
         'indirect': {'project_id': parent_id}}

        It is possible to deduce if a role assignment came from group
        membership if it has both 'user_id' in the main body of the dict and
        'group_id' in the 'indirect' subdict, as well as it is possible to
        deduce if it has come from inheritance if it contains both a
        'project_id' in the main body of the dict and 'parent_id' in the
        'indirect' subdict.

        This function maps this into the format to be returned via the API,
        e.g. for the second example above:

        {
            'user': {
                {'id': user_id}
            },
            'scope': {
                'project': {
                    {'id': project_id}
                },
                'OS-INHERIT:inherited_to': 'projects'
            },
            'role': {
                {'id': role_id}
            },
            'links': {
                'assignment': '/OS-INHERIT/projects/parent_id/users/user_id/'
                              'roles/role_id/inherited_to_projects'
            }
        }

        """

        formatted_entity = {'links': {}}
        inherited_assignment = entity.get('inherited_to_projects')

        if 'project_id' in entity:
            formatted_entity['scope'] = (
                {'project': {'id': entity['project_id']}})

            if 'domain_id' in entity.get('indirect', {}):
                inherited_assignment = True
                formatted_link = ('/domains/%s' %
                                  entity['indirect']['domain_id'])
            elif 'project_id' in entity.get('indirect', {}):
                inherited_assignment = True
                formatted_link = ('/projects/%s' %
                                  entity['indirect']['project_id'])
            else:
                formatted_link = '/projects/%s' % entity['project_id']
        elif 'domain_id' in entity:
            formatted_entity['scope'] = {'domain': {'id': entity['domain_id']}}
            formatted_link = '/domains/%s' % entity['domain_id']

        if 'user_id' in entity:
            formatted_entity['user'] = {'id': entity['user_id']}

            if 'group_id' in entity.get('indirect', {}):
                membership_url = (
                    self.base_url(context, '/groups/%s/users/%s' % (
                        entity['indirect']['group_id'], entity['user_id'])))
                formatted_entity['links']['membership'] = membership_url
                formatted_link += '/groups/%s' % entity['indirect']['group_id']
            else:
                formatted_link += '/users/%s' % entity['user_id']
        elif 'group_id' in entity:
            formatted_entity['group'] = {'id': entity['group_id']}
            formatted_link += '/groups/%s' % entity['group_id']

        formatted_entity['role'] = {'id': entity['role_id']}
        formatted_link += '/roles/%s' % entity['role_id']

        if inherited_assignment:
            formatted_entity['scope']['OS-INHERIT:inherited_to'] = (
                'projects')
            formatted_link = ('/OS-INHERIT%s/inherited_to_projects' %
                              formatted_link)

        formatted_entity['links']['assignment'] = self.base_url(context,
                                                                formatted_link)

        return formatted_entity

    def _assert_effective_filters(self, inherited, group, domain):
        """Assert that useless filter combinations are avoided.

        In effective mode, the following filter combinations are useless, since
        they would always return an empty list of role assignments:
        - group id, since no group assignment is returned in effective mode;
        - domain id and inherited, since no domain inherited assignment is
        returned in effective mode.

        """
        if group:
            msg = _('Combining effective and group filter will always '
                    'result in an empty list.')
            raise exception.ValidationError(msg)

        if inherited and domain:
            msg = _('Combining effective, domain and inherited filters will '
                    'always result in an empty list.')
            raise exception.ValidationError(msg)

    def _assert_domain_nand_project(self, domain_id, project_id):
        if domain_id and project_id:
            msg = _('Specify a domain or project, not both')
            raise exception.ValidationError(msg)

    def _assert_user_nand_group(self, user_id, group_id):
        if user_id and group_id:
            msg = _('Specify a user or group, not both')
            raise exception.ValidationError(msg)

    @controller.filterprotected('group.id', 'role.id',
                                'scope.domain.id', 'scope.project.id',
                                'scope.OS-INHERIT:inherited_to', 'user.id')
    def list_role_assignments(self, context, filters):
        """List role assignments to user and groups on domains and projects.

        Return a list of all existing role assignments in the system, filtered
        by assignments attributes, if provided.

        If effective option is used and OS-INHERIT extension is enabled, the
        following functions will be applied:
        1) For any group role assignment on a target, replace it by a set of
        role assignments containing one for each user of that group on that
        target;
        2) For any inherited role assignment for an actor on a target, replace
        it by a set of role assignments for that actor on every project under
        that target.

        It means that, if effective mode is used, no group or domain inherited
        assignments will be present in the resultant list. Thus, combining
        effective with them is invalid.

        As a role assignment contains only one actor and one target, providing
        both user and group ids or domain and project ids is invalid as well.

        """
        params = context['query_string']
        effective = 'effective' in params and (
            self.query_filter_is_true(params['effective']))

        if 'scope.OS-INHERIT:inherited_to' in params:
            inherited = (
                params['scope.OS-INHERIT:inherited_to'] == 'projects')
        else:
            # None means querying both inherited and direct assignments
            inherited = None

        self._assert_domain_nand_project(params.get('scope.domain.id'),
                                         params.get('scope.project.id'))
        self._assert_user_nand_group(params.get('user.id'),
                                     params.get('group.id'))

        if effective:
            self._assert_effective_filters(inherited=inherited,
                                           group=params.get('group.id'),
                                           domain=params.get(
                                               'scope.domain.id'))

        refs = self.assignment_api.list_role_assignments(
            role_id=params.get('role.id'),
            user_id=params.get('user.id'),
            group_id=params.get('group.id'),
            domain_id=params.get('scope.domain.id'),
            project_id=params.get('scope.project.id'),
            inherited=inherited, effective=effective)

        formatted_refs = [self._format_entity(context, ref) for ref in refs]

        return self.wrap_collection(context, formatted_refs)

    @controller.protected()
    def get_role_assignment(self, context):
        raise exception.NotImplemented()

    @controller.protected()
    def update_role_assignment(self, context):
        raise exception.NotImplemented()

    @controller.protected()
    def delete_role_assignment(self, context):
        raise exception.NotImplemented()