class Aws::SharedConfig

def credentials_from_source(credential_source, config)
  case credential_source
  when 'Ec2InstanceMetadata'
    InstanceProfileCredentials.new(
      retries: config ? config.instance_profile_credentials_retries : 0,
      http_open_timeout: config ? config.instance_profile_credentials_timeout : 1,
      http_read_timeout: config ? config.instance_profile_credentials_timeout : 1
    )
  when 'EcsContainer'
    ECSCredentials.new
  else
    raise Errors::InvalidCredentialSourceError, "Unsupported credential_source: #{credential_source}"
  end
end