class Dependabot::Python::AuthedUrlBuilder

def self.authed_url(credential:)
  token = T.let(credential.fetch("token", nil), T.nilable(String))
  url = T.let(credential.fetch("index-url", nil), T.nilable(String))
  return "" unless url
  return url unless token
  basic_auth_details =
    if token.ascii_only? && token.include?(":") then token
    elsif Base64.decode64(token).ascii_only? &&
          Base64.decode64(token).include?(":")
      Base64.decode64(token)
    else
      token
    end
  if basic_auth_details.include?(":")
    username, _, password = basic_auth_details.partition(":")
    basic_auth_details = "#{CGI.escape(username)}:#{CGI.escape(password)}"
  end
  url.sub("://", "://#{basic_auth_details}@")
end