Attaching AWS::S3::BucketPolicy hangs forever on CREATE_IN_PROGRESS about serverless

[jorovipe97]

Hi, @tenpaiyomi I had the same problem in my case the problem was in the Version of the BucketPolicy. I needed to add quotes to it.

BuildStorageBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
        Bucket: !Ref BuildStorageBucket
        PolicyDocument:
            Version: '2012-10-17' # IMPORTANT ---> See this is now quoted
            Statement:
              - Sid: AllowPublicReadAccess
                Effect: Allow
                Principal: '*'
                Resource: !Sub 'arn:aws:s3:::${BuildStorageBucket}/*'
                Action:
                  - 's3:GetObject'

If we don't quote the Version. Then, the Serverless framework thinks this is a date, generating the following in the CloudFormation template: "Version": "2012-10-17T00:00:00.000Z" instead of just: "Version": "2012-10-17".

This error makes the Cloudformation service stay forever in the CREATE_IN_PROGRESS state for the resource. Even though it should return a validation error.