1 # Copyright 2011 GRNET S.A. All rights reserved.
3 # Redistribution and use in source and binary forms, with or
4 # without modification, are permitted provided that the following
7 # 1. Redistributions of source code must retain the above
8 # copyright notice, this list of conditions and the following
11 # 2. Redistributions in binary form must reproduce the above
12 # copyright notice, this list of conditions and the following
13 # disclaimer in the documentation and/or other materials
14 # provided with the distribution.
16 # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
17 # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
20 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
26 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 # POSSIBILITY OF SUCH DAMAGE.
29 # The views and conclusions contained in the software and
30 # documentation are those of the authors and should not be
31 # interpreted as representing official policies, either expressed
32 # or implied, of GRNET S.A.
42 from base import NotAllowedError, BaseBackend
43 from lib.hashfiler import Mapper, Blocker
45 ( CLUSTER_NORMAL, CLUSTER_HISTORY, CLUSTER_DELETED ) = range(3)
50 logger = logging.getLogger(__name__)
52 def backend_method(func=None, autocommit=1):
55 return backend_method(func, autocommit)
60 def fn(self, *args, **kw):
61 self.wrapper.execute()
63 ret = func(self, *args, **kw)
67 self.wrapper.rollback()
72 class ModularBackend(BaseBackend):
75 Uses modules for SQL functions and hashfiler for storage.
78 def __init__(self, mod, path, db):
79 self.hash_algorithm = 'sha256'
80 self.block_size = 4 * 1024 * 1024 # 4MB
82 self.default_policy = {'quota': 0, 'versioning': 'auto'}
84 if path and not os.path.exists(path):
86 if not os.path.isdir(path):
87 raise RuntimeError("Cannot open path '%s'" % (path,))
90 self.mod = sys.modules[mod]
91 self.wrapper = self.mod.dbwrapper.DBWrapper(db)
93 params = {'blocksize': self.block_size,
94 'blockpath': os.path.join(path + '/blocks'),
95 'hashtype': self.hash_algorithm}
96 self.blocker = Blocker(**params)
98 params = {'mappath': os.path.join(path + '/maps'),
99 'namelen': self.blocker.hashlen}
100 self.mapper = Mapper(**params)
102 params = {'connection': self.wrapper.conn,
103 'cursor': self.wrapper.conn.cursor()}
104 self.permissions = self.mod.permissions.Permissions(**params)
105 for x in ['READ', 'WRITE']:
106 setattr(self, x, getattr(self.mod.permissions, x))
107 self.policy = self.mod.policy.Policy(**params)
108 self.node = self.mod.node.Node(**params)
109 for x in ['ROOTNODE', 'SERIAL', 'SIZE', 'MTIME', 'MUSER', 'CLUSTER']:
110 setattr(self, x, getattr(self.mod.node, x))
113 def list_accounts(self, user, marker=None, limit=10000):
114 """Return a list of accounts the user can access."""
116 logger.debug("list_accounts: %s %s %s", user, marker, limit)
117 allowed = self._allowed_accounts(user)
118 start, limit = self._list_limits(allowed, marker, limit)
119 return allowed[start:start + limit]
122 def get_account_meta(self, user, account, until=None):
123 """Return a dictionary with the account metadata."""
125 logger.debug("get_account_meta: %s %s", account, until)
126 path, node = self._lookup_account(account, user == account)
128 if until or node is None or account not in self._allowed_accounts(user):
129 raise NotAllowedError
131 props = self._get_properties(node, until)
132 mtime = props[self.MTIME]
136 count, bytes, tstamp = self._get_statistics(node, until)
137 tstamp = max(tstamp, mtime)
141 modified = self._get_statistics(node)[2] # Overall last modification.
142 modified = max(modified, mtime)
145 meta = {'name': account}
148 if props is not None:
149 meta.update(dict(self.node.attribute_get(props[self.SERIAL])))
150 if until is not None:
151 meta.update({'until_timestamp': tstamp})
152 meta.update({'name': account, 'count': count, 'bytes': bytes})
153 meta.update({'modified': modified})
157 def update_account_meta(self, user, account, meta, replace=False):
158 """Update the metadata associated with the account."""
160 logger.debug("update_account_meta: %s %s %s", account, meta, replace)
162 raise NotAllowedError
163 path, node = self._lookup_account(account, True)
164 self._put_metadata(user, node, meta, replace, False)
167 def get_account_groups(self, user, account):
168 """Return a dictionary with the user groups defined for this account."""
170 logger.debug("get_account_groups: %s", account)
172 if account not in self._allowed_accounts(user):
173 raise NotAllowedError
175 self._lookup_account(account, True)
176 return self.permissions.group_dict(account)
179 def update_account_groups(self, user, account, groups, replace=False):
180 """Update the groups associated with the account."""
182 logger.debug("update_account_groups: %s %s %s", account, groups, replace)
184 raise NotAllowedError
185 self._lookup_account(account, True)
186 self._check_groups(groups)
188 self.permissions.group_destroy(account)
189 for k, v in groups.iteritems():
190 if not replace: # If not already deleted.
191 self.permissions.group_delete(account, k)
193 self.permissions.group_addmany(account, k, v)
196 def put_account(self, user, account):
197 """Create a new account with the given name."""
199 logger.debug("put_account: %s", account)
201 raise NotAllowedError
202 node = self.node.node_lookup(account)
204 raise NameError('Account already exists')
205 self._put_path(user, self.ROOTNODE, account)
208 def delete_account(self, user, account):
209 """Delete the account with the given name."""
211 logger.debug("delete_account: %s", account)
213 raise NotAllowedError
214 node = self.node.node_lookup(account)
217 if not self.node.node_remove(node):
218 raise IndexError('Account is not empty')
219 self.permissions.group_destroy(account)
222 def list_containers(self, user, account, marker=None, limit=10000, shared=False, until=None):
223 """Return a list of containers existing under an account."""
225 logger.debug("list_containers: %s %s %s %s %s", account, marker, limit, shared, until)
227 if until or account not in self._allowed_accounts(user):
228 raise NotAllowedError
229 allowed = self._allowed_containers(user, account)
230 start, limit = self._list_limits(allowed, marker, limit)
231 return allowed[start:start + limit]
233 allowed = [x.split('/', 2)[1] for x in self.permissions.access_list_shared(account)]
234 start, limit = self._list_limits(allowed, marker, limit)
235 return allowed[start:start + limit]
236 node = self.node.node_lookup(account)
237 return [x[0] for x in self._list_objects(node, account, '', '/', marker, limit, False, [], until)]
240 def get_container_meta(self, user, account, container, until=None):
241 """Return a dictionary with the container metadata."""
243 logger.debug("get_container_meta: %s %s %s", account, container, until)
245 if until or container not in self._allowed_containers(user, account):
246 raise NotAllowedError
247 path, node = self._lookup_container(account, container)
248 props = self._get_properties(node, until)
249 mtime = props[self.MTIME]
250 count, bytes, tstamp = self._get_statistics(node, until)
251 tstamp = max(tstamp, mtime)
255 modified = self._get_statistics(node)[2] # Overall last modification.
256 modified = max(modified, mtime)
259 meta = {'name': container}
261 meta = dict(self.node.attribute_get(props[self.SERIAL]))
262 if until is not None:
263 meta.update({'until_timestamp': tstamp})
264 meta.update({'name': container, 'count': count, 'bytes': bytes})
265 meta.update({'modified': modified})
269 def update_container_meta(self, user, account, container, meta, replace=False):
270 """Update the metadata associated with the container."""
272 logger.debug("update_container_meta: %s %s %s %s", account, container, meta, replace)
274 raise NotAllowedError
275 path, node = self._lookup_container(account, container)
276 self._put_metadata(user, node, meta, replace, False)
279 def get_container_policy(self, user, account, container):
280 """Return a dictionary with the container policy."""
282 logger.debug("get_container_policy: %s %s", account, container)
284 if container not in self._allowed_containers(user, account):
285 raise NotAllowedError
287 path = self._lookup_container(account, container)[0]
288 return self.policy.policy_get(path)
291 def update_container_policy(self, user, account, container, policy, replace=False):
292 """Update the policy associated with the account."""
294 logger.debug("update_container_policy: %s %s %s %s", account, container, policy, replace)
296 raise NotAllowedError
297 path = self._lookup_container(account, container)[0]
298 self._check_policy(policy)
300 for k, v in self.default_policy.iteritems():
303 self.policy.policy_set(path, policy)
306 def put_container(self, user, account, container, policy=None):
307 """Create a new container with the given name."""
309 logger.debug("put_container: %s %s %s", account, container, policy)
311 raise NotAllowedError
313 path, node = self._lookup_container(account, container)
317 raise NameError('Container already exists')
319 self._check_policy(policy)
320 path = '/'.join((account, container))
321 self._put_path(user, self._lookup_account(account, True)[1], path)
322 for k, v in self.default_policy.iteritems():
325 self.policy.policy_set(path, policy)
328 def delete_container(self, user, account, container, until=None):
329 """Delete/purge the container with the given name."""
331 logger.debug("delete_container: %s %s %s", account, container, until)
333 raise NotAllowedError
334 path, node = self._lookup_container(account, container)
336 if until is not None:
337 versions = self.node.node_purge_children(node, until, CLUSTER_HISTORY)
339 self.mapper.map_remv(v)
340 self.node.node_purge_children(node, until, CLUSTER_DELETED)
343 if self._get_statistics(node)[0] > 0:
344 raise IndexError('Container is not empty')
345 versions = self.node.node_purge_children(node, inf, CLUSTER_HISTORY)
347 self.mapper.map_remv(v)
348 self.node.node_purge_children(node, inf, CLUSTER_DELETED)
349 self.node.node_remove(node)
350 self.policy.policy_unset(path)
353 def list_objects(self, user, account, container, prefix='', delimiter=None, marker=None, limit=10000, virtual=True, keys=[], shared=False, until=None):
354 """Return a list of objects existing under a container."""
356 logger.debug("list_objects: %s %s %s %s %s %s %s %s %s %s", account, container, prefix, delimiter, marker, limit, virtual, keys, shared, until)
360 raise NotAllowedError
361 allowed = self.permissions.access_list_paths(user, '/'.join((account, container)))
363 raise NotAllowedError
366 allowed = self.permissions.access_list_shared('/'.join((account, container)))
369 path, node = self._lookup_container(account, container)
370 return self._list_objects(node, path, prefix, delimiter, marker, limit, virtual, keys, until, allowed)
373 def list_object_meta(self, user, account, container, until=None):
374 """Return a list with all the container's object meta keys."""
376 logger.debug("list_object_meta: %s %s %s", account, container, until)
380 raise NotAllowedError
381 allowed = self.permissions.access_list_paths(user, '/'.join((account, container)))
383 raise NotAllowedError
384 path, node = self._lookup_container(account, container)
385 before = until if until is not None else inf
386 return self.node.latest_attribute_keys(node, before, CLUSTER_DELETED, allowed)
389 def get_object_meta(self, user, account, container, name, version=None):
390 """Return a dictionary with the object metadata."""
392 logger.debug("get_object_meta: %s %s %s %s", account, container, name, version)
393 self._can_read(user, account, container, name)
394 path, node = self._lookup_object(account, container, name)
395 props = self._get_version(node, version)
397 modified = props[self.MTIME]
399 modified = self._get_version(node)[self.MTIME] # Overall last modification.
401 meta = dict(self.node.attribute_get(props[self.SERIAL]))
402 meta.update({'name': name, 'bytes': props[self.SIZE]})
403 meta.update({'version': props[self.SERIAL], 'version_timestamp': props[self.MTIME]})
404 meta.update({'modified': modified, 'modified_by': props[self.MUSER]})
408 def update_object_meta(self, user, account, container, name, meta, replace=False):
409 """Update the metadata associated with the object."""
411 logger.debug("update_object_meta: %s %s %s %s %s", account, container, name, meta, replace)
412 self._can_write(user, account, container, name)
413 path, node = self._lookup_object(account, container, name)
414 return self._put_metadata(user, node, meta, replace)
417 def get_object_permissions(self, user, account, container, name):
418 """Return the path from which this object gets its permissions from,\
419 along with a dictionary containing the permissions."""
421 logger.debug("get_object_permissions: %s %s %s", account, container, name)
422 self._can_read(user, account, container, name)
423 path = self._lookup_object(account, container, name)[0]
424 return self.permissions.access_inherit(path)
427 def update_object_permissions(self, user, account, container, name, permissions):
428 """Update the permissions associated with the object."""
430 logger.debug("update_object_permissions: %s %s %s %s", account, container, name, permissions)
432 raise NotAllowedError
433 path = self._lookup_object(account, container, name)[0]
434 self._check_permissions(path, permissions)
435 self.permissions.access_set(path, permissions)
438 def get_object_public(self, user, account, container, name):
439 """Return the public URL of the object if applicable."""
441 logger.debug("get_object_public: %s %s %s", account, container, name)
442 self._can_read(user, account, container, name)
443 path = self._lookup_object(account, container, name)[0]
444 if self.permissions.public_check(path):
445 return '/public/' + path
449 def update_object_public(self, user, account, container, name, public):
450 """Update the public status of the object."""
452 logger.debug("update_object_public: %s %s %s %s", account, container, name, public)
453 self._can_write(user, account, container, name)
454 path = self._lookup_object(account, container, name)[0]
456 self.permissions.public_unset(path)
458 self.permissions.public_set(path)
461 def get_object_hashmap(self, user, account, container, name, version=None):
462 """Return the object's size and a list with partial hashes."""
464 logger.debug("get_object_hashmap: %s %s %s %s", account, container, name, version)
465 self._can_read(user, account, container, name)
466 path, node = self._lookup_object(account, container, name)
467 props = self._get_version(node, version)
468 hashmap = self.mapper.map_retr(props[self.SERIAL])
469 return props[self.SIZE], [binascii.hexlify(x) for x in hashmap]
472 def update_object_hashmap(self, user, account, container, name, size, hashmap, meta={}, replace_meta=False, permissions=None):
473 """Create/update an object with the specified size and partial hashes."""
475 logger.debug("update_object_hashmap: %s %s %s %s %s", account, container, name, size, hashmap)
476 if permissions is not None and user != account:
477 raise NotAllowedError
478 self._can_write(user, account, container, name)
479 missing = self.blocker.block_ping([binascii.unhexlify(x) for x in hashmap])
482 ie.data = [binascii.hexlify(x) for x in missing]
484 path = '/'.join((account, container, name))
485 if permissions is not None:
486 self._check_permissions(path, permissions)
487 path, node = self._put_object_node(account, container, name)
488 src_version_id, dest_version_id = self._copy_version(user, node, None, node, size)
489 self.mapper.map_stor(dest_version_id, [binascii.unhexlify(x) for x in hashmap])
490 if not replace_meta and src_version_id is not None:
491 self.node.attribute_copy(src_version_id, dest_version_id)
492 self.node.attribute_set(dest_version_id, ((k, v) for k, v in meta.iteritems()))
493 if permissions is not None:
494 self.permissions.access_set(path, permissions)
495 return dest_version_id
498 def copy_object(self, user, account, src_container, src_name, dest_container, dest_name, dest_meta={}, replace_meta=False, permissions=None, src_version=None):
499 """Copy an object's data and metadata."""
501 logger.debug("copy_object: %s %s %s %s %s %s %s %s %s", account, src_container, src_name, dest_container, dest_name, dest_meta, replace_meta, permissions, src_version)
502 if permissions is not None and user != account:
503 raise NotAllowedError
504 self._can_read(user, account, src_container, src_name)
505 self._can_write(user, account, dest_container, dest_name)
506 src_path, src_node = self._lookup_object(account, src_container, src_name)
507 if permissions is not None:
508 self._check_permissions(dest_path, permissions)
509 dest_path, dest_node = self._put_object_node(account, dest_container, dest_name)
510 src_version_id, dest_version_id = self._copy_version(user, src_node, src_version, dest_node)
511 if src_version_id is not None:
512 self._copy_data(src_version_id, dest_version_id)
513 if not replace_meta and src_version_id is not None:
514 self.node.attribute_copy(src_version_id, dest_version_id)
515 self.node.attribute_set(dest_version_id, ((k, v) for k, v in dest_meta.iteritems()))
516 if permissions is not None:
517 dest_path = '/'.join((account, container, name))
518 self.permissions.access_set(dest_path, permissions)
519 return dest_version_id
522 def move_object(self, user, account, src_container, src_name, dest_container, dest_name, dest_meta={}, replace_meta=False, permissions=None):
523 """Move an object's data and metadata."""
525 logger.debug("move_object: %s %s %s %s %s %s %s %s", account, src_container, src_name, dest_container, dest_name, dest_meta, replace_meta, permissions)
526 dest_version_id = self.copy_object(user, account, src_container, src_name, dest_container, dest_name, dest_meta, replace_meta, permissions, None)
527 self.delete_object(user, account, src_container, src_name)
528 return dest_version_id
531 def delete_object(self, user, account, container, name, until=None):
532 """Delete/purge an object."""
534 logger.debug("delete_object: %s %s %s %s", account, container, name, until)
536 raise NotAllowedError
538 if until is not None:
539 path = '/'.join((account, container, name))
540 node = self.node.node_lookup(path)
543 versions = self.node.node_purge(node, until, CLUSTER_NORMAL)
544 versions += self.node.node_purge(node, until, CLUSTER_HISTORY)
546 self.mapper.map_remv(v)
547 self.node.node_purge_children(node, until, CLUSTER_DELETED)
549 props = self._get_version(node)
553 self.permissions.access_clear(path)
556 path, node = self._lookup_object(account, container, name)
557 self._copy_version(user, node, None, node, 0, CLUSTER_DELETED)
558 self.permissions.access_clear(path)
561 def list_versions(self, user, account, container, name):
562 """Return a list of all (version, version_timestamp) tuples for an object."""
564 logger.debug("list_versions: %s %s %s", account, container, name)
565 self._can_read(user, account, container, name)
566 path, node = self._lookup_object(account, container, name)
567 return self.node.node_get_versions(node, ['serial', 'mtime'])
569 @backend_method(autocommit=0)
570 def get_block(self, hash):
571 """Return a block's data."""
573 logger.debug("get_block: %s", hash)
574 blocks = self.blocker.block_retr((binascii.unhexlify(hash),))
576 raise NameError('Block does not exist')
579 @backend_method(autocommit=0)
580 def put_block(self, data):
581 """Store a block and return the hash."""
583 logger.debug("put_block: %s", len(data))
584 hashes, absent = self.blocker.block_stor((data,))
585 return binascii.hexlify(hashes[0])
587 @backend_method(autocommit=0)
588 def update_block(self, hash, data, offset=0):
589 """Update a known block and return the hash."""
591 logger.debug("update_block: %s %s %s", hash, len(data), offset)
592 if offset == 0 and len(data) == self.block_size:
593 return self.put_block(data)
594 h, e = self.blocker.block_delta(binascii.unhexlify(hash), ((offset, data),))
595 return binascii.hexlify(h)
599 def _put_object_node(self, account, container, name):
600 path, parent = self._lookup_container(account, container)
601 path = '/'.join((path, name))
602 node = self.node.node_lookup(path)
604 node = self.node.node_create(parent, path)
607 def _put_path(self, user, parent, path):
608 node = self.node.node_create(parent, path)
609 self.node.version_create(node, 0, None, user, CLUSTER_NORMAL)
612 def _lookup_account(self, account, create=True):
613 node = self.node.node_lookup(account)
614 if node is None and create:
615 node = self._put_path(account, self.ROOTNODE, account) # User is account.
618 def _lookup_container(self, account, container):
619 path = '/'.join((account, container))
620 node = self.node.node_lookup(path)
622 raise NameError('Container does not exist')
625 def _lookup_object(self, account, container, name):
626 path = '/'.join((account, container, name))
627 node = self.node.node_lookup(path)
629 raise NameError('Object does not exist')
632 def _get_properties(self, node, until=None):
633 """Return properties until the timestamp given."""
635 before = until if until is not None else inf
636 props = self.node.version_lookup(node, before, CLUSTER_NORMAL)
637 if props is None and until is not None:
638 props = self.node.version_lookup(node, before, CLUSTER_HISTORY)
640 raise NameError('Path does not exist')
643 def _get_statistics(self, node, until=None):
644 """Return count, sum of size and latest timestamp of everything under node."""
647 stats = self.node.statistics_get(node, CLUSTER_NORMAL)
649 stats = self.node.statistics_latest(node, until, CLUSTER_DELETED)
654 def _get_version(self, node, version=None):
656 props = self.node.version_lookup(node, inf, CLUSTER_NORMAL)
658 raise NameError('Object does not exist')
660 props = self.node.version_get_properties(version)
661 if props is None or props[self.CLUSTER] == CLUSTER_DELETED:
662 raise IndexError('Version does not exist')
665 def _copy_version(self, user, src_node, src_version, dest_node, dest_size=None, dest_cluster=CLUSTER_NORMAL):
667 # Get source serial and size.
668 if src_version is not None:
669 src_props = self._get_version(src_node, src_version)
670 src_version_id = src_props[self.SERIAL]
671 size = src_props[self.SIZE]
673 # Latest or create from scratch.
675 src_props = self._get_version(src_node)
676 src_version_id = src_props[self.SERIAL]
677 size = src_props[self.SIZE]
679 src_version_id = None
681 if dest_size is not None:
684 # Move the latest version at destination to CLUSTER_HISTORY and create new.
685 if src_node == dest_node and src_version is None and src_version_id is not None:
686 self.node.version_recluster(src_version_id, CLUSTER_HISTORY)
688 dest_props = self.node.version_lookup(dest_node, inf, CLUSTER_NORMAL)
689 if dest_props is not None:
690 self.node.version_recluster(dest_props[self.SERIAL], CLUSTER_HISTORY)
691 dest_version_id, mtime = self.node.version_create(dest_node, size, src_version_id, user, dest_cluster)
693 return src_version_id, dest_version_id
695 def _copy_data(self, src_version, dest_version):
696 hashmap = self.mapper.map_retr(src_version)
697 self.mapper.map_stor(dest_version, hashmap)
699 def _get_metadata(self, version):
702 return dict(self.node.attribute_get(version))
704 def _put_metadata(self, user, node, meta, replace=False, copy_data=True):
705 """Create a new version and store metadata."""
707 src_version_id, dest_version_id = self._copy_version(user, node, None, node)
709 if src_version_id is not None:
710 self.node.attribute_copy(src_version_id, dest_version_id)
711 self.node.attribute_del(dest_version_id, (k for k, v in meta.iteritems() if v == ''))
712 self.node.attribute_set(dest_version_id, ((k, v) for k, v in meta.iteritems() if v != ''))
714 self.node.attribute_set(dest_version_id, ((k, v) for k, v in meta.iteritems()))
715 if copy_data and src_version_id is not None:
716 self._copy_data(src_version_id, dest_version_id)
717 return dest_version_id
719 def _list_limits(self, listing, marker, limit):
723 start = listing.index(marker) + 1
726 if not limit or limit > 10000:
730 def _list_objects(self, parent, path, prefix='', delimiter=None, marker=None, limit=10000, virtual=True, keys=[], until=None, allowed=[]):
731 cont_prefix = path + '/'
732 prefix = cont_prefix + prefix
733 start = cont_prefix + marker if marker else None
734 before = until if until is not None else inf
735 filterq = ','.join(keys) if keys else None
737 objects, prefixes = self.node.latest_version_list(parent, prefix, delimiter, start, limit, before, CLUSTER_DELETED, allowed, filterq)
738 objects.extend([(p, None) for p in prefixes] if virtual else [])
740 objects = [(x[0][len(cont_prefix):], x[1]) for x in objects]
742 start, limit = self._list_limits([x[0] for x in objects], marker, limit)
743 return objects[start:start + limit]
747 def _check_policy(self, policy):
748 for k in policy.keys():
750 policy[k] = self.default_policy.get(k)
751 for k, v in policy.iteritems():
753 q = int(v) # May raise ValueError.
756 elif k == 'versioning':
757 if v not in ['auto', 'manual', 'none']:
762 # Access control functions.
764 def _check_groups(self, groups):
765 # raise ValueError('Bad characters in groups')
768 def _check_permissions(self, path, permissions):
769 # raise ValueError('Bad characters in permissions')
771 # Check for existing permissions.
772 paths = self.permissions.access_list(path)
774 ae = AttributeError()
778 def _can_read(self, user, account, container, name):
781 path = '/'.join((account, container, name))
782 if not self.permissions.access_check(path, self.READ, user) and not self.permissions.access_check(path, self.WRITE, user):
783 raise NotAllowedError
785 def _can_write(self, user, account, container, name):
788 path = '/'.join((account, container, name))
789 if not self.permissions.access_check(path, self.WRITE, user):
790 raise NotAllowedError
792 def _allowed_accounts(self, user):
794 for path in self.permissions.access_list_paths(user):
795 allow.add(path.split('/', 1)[0])
798 def _allowed_containers(self, user, account):
800 for path in self.permissions.access_list_paths(user, account):
801 allow.add(path.split('/', 2)[1])