Gem::Security::Policy#check_chain

# File tmp/rubies/ruby-3.1.3/lib/rubygems/security/policy.rb, line 55
def check_chain(chain, time)
  raise Gem::Security::Exception, "missing signing chain" unless chain
  raise Gem::Security::Exception, "empty signing chain" if chain.empty?

  begin
    chain.each_cons 2 do |issuer, cert|
      check_cert cert, issuer, time
    end

    true
  rescue Gem::Security::Exception => e
    raise Gem::Security::Exception, "invalid signing chain: #{e.message}"
  end
end