feat: add public access prevention to bucket IAM configuration (#304)

Author: shaffeeullah

google/cloud/storage/bucket.py

@@ -50,6 +50,7 @@
 from google.cloud.storage.constants import MULTI_REGIONAL_LEGACY_STORAGE_CLASS
 from google.cloud.storage.constants import MULTI_REGION_LOCATION_TYPE
 from google.cloud.storage.constants import NEARLINE_STORAGE_CLASS
+from google.cloud.storage.constants import PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
 from google.cloud.storage.constants import REGIONAL_LEGACY_STORAGE_CLASS
 from google.cloud.storage.constants import REGION_LOCATION_TYPE
 from google.cloud.storage.constants import STANDARD_STORAGE_CLASS
@@ -383,6 +384,12 @@ class IAMConfiguration(dict):
     :type bucket: :class:`Bucket`
     :params bucket: Bucket for which this instance is the policy.
 
+    :type public_access_prevention: str
+    :params public_access_prevention:
+        (Optional) Whether the public access prevention policy is 'unspecified' (default) or 'enforced'
+        See: https://cloud.google.com/storage/docs/public-access-prevention
+        See: https://cloud.google.com/storage/docs/public-access-prevention
+
     :type uniform_bucket_level_access_enabled: bool
     :params bucket_policy_only_enabled:
         (Optional) Whether the IAM-only policy is enabled for the bucket.
@@ -404,6 +411,7 @@ class IAMConfiguration(dict):
     def __init__(
         self,
         bucket,
+        public_access_prevention=_default,
         uniform_bucket_level_access_enabled=_default,
         uniform_bucket_level_access_locked_time=_default,
         bucket_policy_only_enabled=_default,
@@ -428,8 +436,14 @@ def __init__(
         if uniform_bucket_level_access_enabled is _default:
             uniform_bucket_level_access_enabled = False
 
+        if public_access_prevention is _default:
+            public_access_prevention = PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
+
         data = {
-            "uniformBucketLevelAccess": {"enabled": uniform_bucket_level_access_enabled}
+            "uniformBucketLevelAccess": {
+                "enabled": uniform_bucket_level_access_enabled
+            },
+            "publicAccessPrevention": public_access_prevention,
         }
         if uniform_bucket_level_access_locked_time is not _default:
             data["uniformBucketLevelAccess"]["lockedTime"] = _datetime_to_rfc3339(
@@ -464,6 +478,21 @@ def bucket(self):
         """
         return self._bucket
 
+    @property
+    def public_access_prevention(self):
+        """Setting for public access prevention policy. Options are 'unspecified' (default) or 'enforced'.
+            More information can be found at https://cloud.google.com/storage/docs/public-access-prevention
+
+        :rtype: string
+        :returns: the public access prevention status, either 'enforced' or 'unspecified'.
+        """
+        return self["publicAccessPrevention"]
+
+    @public_access_prevention.setter
+    def public_access_prevention(self, value):
+        self["publicAccessPrevention"] = value
+        self.bucket._patch_property("iamConfiguration", self)
+
     @property
     def uniform_bucket_level_access_enabled(self):
         """If set, access checks only use bucket-level IAM policies or above.

google/cloud/storage/constants.py

@@ -96,3 +96,16 @@
 _DEFAULT_TIMEOUT = 60  # in seconds
 """The default request timeout in seconds if a timeout is not explicitly given.
 """
+
+# Public Access Prevention
+PUBLIC_ACCESS_PREVENTION_ENFORCED = "enforced"
+"""Enforced public access prevention value.
+
+See: https://cloud.google.com/storage/docs/public-access-prevention
+"""
+
+PUBLIC_ACCESS_PREVENTION_UNSPECIFIED = "unspecified"
+"""Unspecified public access prevention value.
+
+See: https://cloud.google.com/storage/docs/public-access-prevention
+"""

tests/system/test_bucket.py

@@ -766,3 +766,82 @@ def test_ubla_set_unset_preserves_acls(
 
     assert bucket_acl_before == bucket_acl_after
     assert blob_acl_before == blob_acl_after
+
+
+def test_new_bucket_created_w_unspecified_pap(
+    storage_client, buckets_to_delete, blobs_to_delete,
+):
+    from google.cloud.storage import constants
+
+    bucket_name = _helpers.unique_name("new-w-pap-unspecified")
+    bucket = storage_client.bucket(bucket_name)
+    bucket.iam_configuration.uniform_bucket_level_access_enabled = True
+    bucket.create()
+    buckets_to_delete.append(bucket)
+
+    assert (
+        bucket.iam_configuration.public_access_prevention
+        == constants.PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
+    )
+
+    bucket.iam_configuration.public_access_prevention = (
+        constants.PUBLIC_ACCESS_PREVENTION_ENFORCED
+    )
+    bucket.patch()
+    assert (
+        bucket.iam_configuration.public_access_prevention
+        == constants.PUBLIC_ACCESS_PREVENTION_ENFORCED
+    )
+    assert bucket.iam_configuration.uniform_bucket_level_access_enabled
+
+    bucket.iam_configuration.uniform_bucket_level_access_enabled = False
+    bucket.patch()
+    assert (
+        bucket.iam_configuration.public_access_prevention
+        == constants.PUBLIC_ACCESS_PREVENTION_ENFORCED
+    )
+
+    with pytest.raises(exceptions.BadRequest):
+        bucket.iam_configuration.public_access_prevention = "unexpected value"
+        bucket.patch()
+
+    with pytest.raises(exceptions.PreconditionFailed):
+        bucket.make_public()
+
+    blob_name = "my-blob.txt"
+    blob = bucket.blob(blob_name)
+    payload = b"DEADBEEF"
+    blob.upload_from_string(payload)
+
+    with pytest.raises(exceptions.PreconditionFailed):
+        blob.make_public()
+
+
+def test_new_bucket_created_w_enforced_pap(
+    storage_client, buckets_to_delete, blobs_to_delete,
+):
+    from google.cloud.storage import constants
+
+    bucket_name = _helpers.unique_name("new-w-pap-enforced")
+    bucket = storage_client.bucket(bucket_name)
+    bucket.iam_configuration.public_access_prevention = (
+        constants.PUBLIC_ACCESS_PREVENTION_ENFORCED
+    )
+    bucket.create()
+    buckets_to_delete.append(bucket)
+
+    assert (
+        bucket.iam_configuration.public_access_prevention
+        == constants.PUBLIC_ACCESS_PREVENTION_ENFORCED
+    )
+
+    bucket.iam_configuration.public_access_prevention = (
+        constants.PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
+    )
+    bucket.patch()
+
+    assert (
+        bucket.iam_configuration.public_access_prevention
+        == constants.PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
+    )
+    assert not bucket.iam_configuration.uniform_bucket_level_access_enabled

tests/unit/test_bucket.py

@@ -22,6 +22,8 @@
 from google.cloud.storage.retry import DEFAULT_RETRY_IF_ETAG_IN_JSON
 from google.cloud.storage.retry import DEFAULT_RETRY_IF_GENERATION_SPECIFIED
 from google.cloud.storage.retry import DEFAULT_RETRY_IF_METAGENERATION_SPECIFIED
+from google.cloud.storage.constants import PUBLIC_ACCESS_PREVENTION_ENFORCED
+from google.cloud.storage.constants import PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
 
 
 def _create_signing_credentials():
@@ -356,6 +358,9 @@ def test_ctor_defaults(self):
         self.assertIs(config.bucket, bucket)
         self.assertFalse(config.uniform_bucket_level_access_enabled)
         self.assertIsNone(config.uniform_bucket_level_access_locked_time)
+        self.assertEqual(
+            config.public_access_prevention, PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
+        )
         self.assertFalse(config.bucket_policy_only_enabled)
         self.assertIsNone(config.bucket_policy_only_locked_time)
 
@@ -378,6 +383,24 @@ def test_ctor_explicit_ubla(self):
         self.assertTrue(config.bucket_policy_only_enabled)
         self.assertEqual(config.bucket_policy_only_locked_time, now)
 
+    def test_ctor_explicit_pap(self):
+        bucket = self._make_bucket()
+
+        config = self._make_one(
+            bucket, public_access_prevention=PUBLIC_ACCESS_PREVENTION_ENFORCED,
+        )
+
+        self.assertIs(config.bucket, bucket)
+        self.assertFalse(config.uniform_bucket_level_access_enabled)
+        self.assertEqual(
+            config.public_access_prevention, PUBLIC_ACCESS_PREVENTION_ENFORCED
+        )
+
+        config.public_access_prevention = PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
+        self.assertEqual(
+            config.public_access_prevention, PUBLIC_ACCESS_PREVENTION_UNSPECIFIED
+        )
+
     def test_ctor_explicit_bpo(self):
         import datetime
         import pytz