/
hmac_key.py
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/
hmac_key.py
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# Copyright 2019 Google LLC
#
# 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.
from google.cloud.exceptions import NotFound
from google.cloud._helpers import _rfc3339_to_datetime
from google.cloud.storage.constants import _DEFAULT_TIMEOUT
from google.cloud.storage.retry import DEFAULT_RETRY
from google.cloud.storage.retry import DEFAULT_RETRY_IF_ETAG_IN_JSON
class HMACKeyMetadata(object):
"""Metadata about an HMAC service account key withn Cloud Storage.
:type client: :class:`~google.cloud.stoage.client.Client`
:param client: client associated with the key metadata.
:type access_id: str
:param access_id: (Optional) Unique ID of an existing key.
:type project_id: str
:param project_id: (Optional) Project ID of an existing key.
Defaults to client's project.
:type user_project: str
:param user_project: (Optional) This parameter is currently ignored.
"""
ACTIVE_STATE = "ACTIVE"
"""Key is active, and may be used to sign requests."""
INACTIVE_STATE = "INACTIVE"
"""Key is inactive, and may not be used to sign requests.
It can be re-activated via :meth:`update`.
"""
DELETED_STATE = "DELETED"
"""Key is deleted. It cannot be re-activated."""
_SETTABLE_STATES = (ACTIVE_STATE, INACTIVE_STATE)
def __init__(self, client, access_id=None, project_id=None, user_project=None):
self._client = client
self._properties = {}
if access_id is not None:
self._properties["accessId"] = access_id
if project_id is not None:
self._properties["projectId"] = project_id
self._user_project = user_project
def __eq__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self._client == other._client and self.access_id == other.access_id
def __hash__(self):
return hash(self._client) + hash(self.access_id)
@property
def access_id(self):
"""Access ID of the key.
:rtype: str or None
:returns: unique identifier of the key within a project.
"""
return self._properties.get("accessId")
@property
def etag(self):
"""ETag identifying the version of the key metadata.
:rtype: str or None
:returns: ETag for the version of the key's metadata.
"""
return self._properties.get("etag")
@property
def id(self):
"""ID of the key, including the Project ID and the Access ID.
:rtype: str or None
:returns: ID of the key.
"""
return self._properties.get("id")
@property
def project(self):
"""Project ID associated with the key.
:rtype: str or None
:returns: project identfier for the key.
"""
return self._properties.get("projectId")
@property
def service_account_email(self):
"""Service account e-mail address associated with the key.
:rtype: str or None
:returns: e-mail address for the service account which created the key.
"""
return self._properties.get("serviceAccountEmail")
@property
def state(self):
"""Get / set key's state.
One of:
- ``ACTIVE``
- ``INACTIVE``
- ``DELETED``
:rtype: str or None
:returns: key's current state.
"""
return self._properties.get("state")
@state.setter
def state(self, value):
if value not in self._SETTABLE_STATES:
raise ValueError(
"State may only be set to one of: {}".format(
", ".join(self._SETTABLE_STATES)
)
)
self._properties["state"] = value
@property
def time_created(self):
"""Retrieve the timestamp at which the HMAC key was created.
:rtype: :class:`datetime.datetime` or ``NoneType``
:returns: Datetime object parsed from RFC3339 valid timestamp, or
``None`` if the bucket's resource has not been loaded
from the server.
"""
value = self._properties.get("timeCreated")
if value is not None:
return _rfc3339_to_datetime(value)
@property
def updated(self):
"""Retrieve the timestamp at which the HMAC key was created.
:rtype: :class:`datetime.datetime` or ``NoneType``
:returns: Datetime object parsed from RFC3339 valid timestamp, or
``None`` if the bucket's resource has not been loaded
from the server.
"""
value = self._properties.get("updated")
if value is not None:
return _rfc3339_to_datetime(value)
@property
def path(self):
"""Resource path for the metadata's key."""
if self.access_id is None:
raise ValueError("No 'access_id' set.")
project = self.project
if project is None:
project = self._client.project
return "/projects/{}/hmacKeys/{}".format(project, self.access_id)
@property
def user_project(self):
"""Project ID to be billed for API requests made via this bucket.
This property is currently ignored by the server.
:rtype: str
"""
return self._user_project
def exists(self, timeout=_DEFAULT_TIMEOUT):
"""Determine whether or not the key for this metadata exists.
:type timeout: float or tuple
:param timeout: (Optional) The amount of time, in seconds, to wait
for the server response.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
:rtype: bool
:returns: True if the key exists in Cloud Storage.
"""
try:
qs_params = {}
if self.user_project is not None:
qs_params["userProject"] = self.user_project
self._client._connection.api_request(
method="GET", path=self.path, query_params=qs_params, timeout=timeout
)
except NotFound:
return False
else:
return True
def reload(self, timeout=_DEFAULT_TIMEOUT):
"""Reload properties from Cloud Storage.
:type timeout: float or tuple
:param timeout: (Optional) The amount of time, in seconds, to wait
for the server response.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
:raises :class:`~google.api_core.exceptions.NotFound`:
if the key does not exist on the back-end.
"""
qs_params = {}
if self.user_project is not None:
qs_params["userProject"] = self.user_project
self._properties = self._client._connection.api_request(
method="GET", path=self.path, query_params=qs_params, timeout=timeout
)
def update(self, timeout=_DEFAULT_TIMEOUT):
"""Save writable properties to Cloud Storage.
:type timeout: float or tuple
:param timeout: (Optional) The amount of time, in seconds, to wait
for the server response.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
:raises :class:`~google.api_core.exceptions.NotFound`:
if the key does not exist on the back-end.
"""
qs_params = {}
if self.user_project is not None:
qs_params["userProject"] = self.user_project
payload = {"state": self.state}
self._properties = self._client._connection.api_request(
method="PUT",
path=self.path,
data=payload,
query_params=qs_params,
timeout=timeout,
retry=DEFAULT_RETRY_IF_ETAG_IN_JSON,
)
def delete(self, timeout=_DEFAULT_TIMEOUT):
"""Delete the key from Cloud Storage.
:type timeout: float or tuple
:param timeout: (Optional) The amount of time, in seconds, to wait
for the server response.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
:raises :class:`~google.api_core.exceptions.NotFound`:
if the key does not exist on the back-end.
"""
if self.state != self.INACTIVE_STATE:
raise ValueError("Cannot delete key if not in 'INACTIVE' state.")
qs_params = {}
if self.user_project is not None:
qs_params["userProject"] = self.user_project
self._client._connection.api_request(
method="DELETE",
path=self.path,
query_params=qs_params,
timeout=timeout,
retry=DEFAULT_RETRY,
)