AWSLambda: publish_layer_version() should always set the code_sha_256 attr (#6920)

moto/awslambda/models.py

@@ -371,6 +371,11 @@ class LayerVersion(CloudFormationModel):
                     self.code_sha_256,
                     self.code_digest,
                 ) = _s3_content(key)
+            else:
+                self.code_bytes = b""
+                self.code_size = 0
+                self.code_sha_256 = ""
+                self.code_digest = ""
 
     @property
     def arn(self) -> str:

tests/test_awslambda/test_lambda_layers.py

@@ -1,10 +1,12 @@
 import boto3
+import os
 import pytest
 
 from botocore.exceptions import ClientError
 from freezegun import freeze_time
-from moto import mock_lambda, mock_s3
+from moto import mock_lambda, mock_s3, settings
 from moto.core import DEFAULT_ACCOUNT_ID as ACCOUNT_ID
+from unittest import mock, SkipTest
 from uuid import uuid4
 
 from .utilities import get_role_name, get_test_zip_file1
@@ -31,6 +33,20 @@ def test_publish_lambda_layers__without_content():
     assert err["Message"] == "Missing Content"
 
 
+@mock_lambda
+@mock.patch.dict(os.environ, {"VALIDATE_LAMBDA_S3": "false"})
+def test_publish_layer_with_unknown_s3_file():
+    if not settings.TEST_DECORATOR_MODE:
+        raise SkipTest("Can only set env var in DecoratorMode")
+    conn = boto3.client("lambda", _lambda_region)
+    content = conn.publish_layer_version(
+        LayerName=str(uuid4())[0:6],
+        Content=dict(S3Bucket="my-bucket", S3Key="my-key.zip"),
+    )["Content"]
+    assert content["CodeSha256"] == ""
+    assert content["CodeSize"] == 0
+
+
 @mock_lambda
 @mock_s3
 @freeze_time("2015-01-01 00:00:00")