class Bundler::Fetcher

def specs(gem_names, source)
  old = Bundler.rubygems.sources
  index = Bundler::Index.new
  if Bundler::Fetcher.disable_endpoint
    @use_api = false
    specs = fetchers.last.specs(gem_names)
  else
    specs = []
    fetchers.shift until fetchers.first.available? || fetchers.empty?
    fetchers.dup.each do |f|
      break unless f.api_fetcher? && !gem_names || !specs = f.specs(gem_names)
      fetchers.delete(f)
    end
    @use_api = false if fetchers.none?(&:api_fetcher?)
  end
  specs.each do |name, version, platform, dependencies|
    next if name == "bundler"
    spec = if dependencies
      EndpointSpecification.new(name, version, platform, dependencies)
    else
      RemoteSpecification.new(name, version, platform, self)
    end
    spec.source = source
    spec.remote = @remote
    index << spec
  end
  index
rescue CertificateFailureError
  Bundler.ui.info "" if gem_names && use_api # newline after dots
  raise
ensure
  Bundler.rubygems.sources = old
end