code: function configurePolicyForBucket(aws, bucketName, customPolicy) {
    const policy = customPolicy || {
      Version: '2012-10-17',
      Statement: [
        {
          Effect: 'Allow',
          Principal: {
            AWS: '*'
          },
          Action: 's3:GetObject',
          Resource: `arn:aws:s3:::${bucketName}/*`
        }
      ]
    };
  
    const params = {
      Bucket: bucketName,
      Policy: JSON.stringify(policy)
    };
  
    return aws.request('S3', 'putBucketPolicy', params);
  }
docs: Configures policy for given bucket
  @param {Object} aws - AWS class
  @param {string} bucketName - Name of bucket to be configured