class ChefConfig::Config

def self.export_proxy(scheme, path, user, pass)
  path = "#{scheme}://#{path}" unless path.include?("://")
  # URI.split returns the following parts:
  # [scheme, userinfo, host, port, registry, path, opaque, query, fragment]
  uri = Addressable::URI.encode(path, Addressable::URI)
  if user && !user.empty?
    userinfo = Addressable::URI.encode_component(user, USER)
    if pass
      userinfo << ":#{Addressable::URI.encode_component(pass, PASSWORD)}"
    end
    uri.userinfo = userinfo
  end
  path = uri.to_s
  ENV["#{scheme}_proxy".downcase] = path unless ENV["#{scheme}_proxy".downcase]
  ENV["#{scheme}_proxy".upcase] = path unless ENV["#{scheme}_proxy".upcase]
end