code: async def _publish(self, model, path):
          
          if model['type'] != 'notebook':
              raise web.HTTPError(400, "bookstore only publishes notebooks")
          content = model['content']
  
          full_s3_path = s3_path(
              self.bookstore_settings.s3_bucket, self.bookstore_settings.published_prefix, path
          )
          file_key = s3_key(self.bookstore_settings.published_prefix, path)
  
          self.log.info(
              "Publishing to %s",
              s3_display_path(
                  self.bookstore_settings.s3_bucket, self.bookstore_settings.published_prefix, path
              ),
          )
  
          async with self.session.create_client(
              's3',
              aws_secret_access_key=self.bookstore_settings.s3_secret_access_key,
              aws_access_key_id=self.bookstore_settings.s3_access_key_id,
              endpoint_url=self.bookstore_settings.s3_endpoint_url,
              region_name=self.bookstore_settings.s3_region_name,
          ) as client:
              self.log.info("Processing published write of %s", path)
              obj = await client.put_object(
                  Bucket=self.bookstore_settings.s3_bucket, Key=file_key, Body=json.dumps(content)
              )
              self.log.info("Done with published write of %s", path)
  
          self.set_status(201)
  
          resp_content = {"s3path": full_s3_path}
  
          if 'VersionId' in obj:
              resp_content["versionID"] = obj['VersionId']
  
          resp_str = json.dumps(resp_content)
          self.finish(resp_str)
docs: Publish notebook model to the path