class Bundler::Fetcher::Dependency

def api_available?
  downloader.fetch(dependency_api_uri)
rescue NetworkDownError => e
  raise HTTPError, e.message
rescue AuthenticationRequiredError
  # We got a 401 from the server. Just fail.
  raise
rescue HTTPError
end

def api_fetcher?
  true
end

def dependency_api_uri(gem_names = [])
  uri = fetch_uri + "api/v1/dependencies"
  uri.query = "gems=#{URI.encode(gem_names.join(","))}" if gem_names.any?
  uri
end

def dependency_specs(gem_names)
  Bundler.ui.debug "Query Gemcutter Dependency Endpoint API: #{gem_names.join(',')}"
  gem_list = []
  deps_list = []
  gem_names.each_slice(Source::Rubygems::API_REQUEST_SIZE) do |names|
    marshalled_deps = downloader.fetch dependency_api_uri(names)
    gem_list += Bundler.load_marshal(marshalled_deps)
  end
  spec_list = gem_list.map do |s|
    dependencies = s[:dependencies].map do |name, requirement|
      dep = well_formed_dependency(name, requirement.split(", "))
      deps_list << dep.name
      dep
    end
    [s[:name], Gem::Version.new(s[:number]), s[:platform], dependencies]
  end
  [spec_list, deps_list.uniq]
end

def specs(gem_names, full_dependency_list = [], last_spec_list = [])
  query_list = gem_names - full_dependency_list
  # only display the message on the first run
  if Bundler.ui.debug?
    Bundler.ui.debug "Query List: #{query_list.inspect}"
  else
    Bundler.ui.info ".", false
  end
  return {remote_uri => last_spec_list} if query_list.empty?
  remote_specs = Bundler::Retry.new("dependency api", AUTH_ERRORS).attempts do
    dependency_specs(query_list)
  end
  spec_list, deps_list = remote_specs
  returned_gems = spec_list.map(&:first).uniq
  specs(deps_list, full_dependency_list + returned_gems, spec_list + last_spec_list)
rescue HTTPError, MarshalError, GemspecError
  Bundler.ui.info "" unless Bundler.ui.debug? # new line now that the dots are over
  Bundler.ui.debug "could not fetch from the dependency API, trying the full index"
  return nil
end

def well_formed_dependency(name, *requirements)
  Gem::Dependency.new(name, *requirements)
rescue ArgumentError => e
  illformed = 'Ill-formed requirement ["#<YAML::Syck::DefaultKey'
  raise e unless e.message.include?(illformed)
  puts # we shouldn't print the error message on the "fetching info" status line
  raise GemspecError,
    "Unfortunately, the gem #{s[:name]} (#{s[:number]}) has an invalid " \
    "gemspec. \nPlease ask the gem author to yank the bad version to fix " \
    "this issue. For more information, see http://bit.ly/syck-defaultkey."
end