Gem::Commands::CheckcertCommand

    # File lib/rubygems/commands/checkcert_command.rb, line 17
17:   def initialize
18:     super("checkcert", "Display the certificate of a gem's signature, if any.",
19:           :domain => :local, :version => Gem::Requirement.default)
20: 
21:     add_version_option
22:     add_local_remote_options
23:   end

    # File lib/rubygems/commands/checkcert_command.rb, line 37
37:   def check_certificate
38:     gem, specs = get_one_gem_name, []
39: 
40:     dep = Gem::Dependency.new gem, options[:version]
41: 
42:     if local? then
43:       if File.exist? gem then
44:         specs << Gem::Format.from_file_by_path(gem).spec # rescue nil
45:       end
46: 
47:       specs.push(*Gem.source_index.search(dep)) if specs.empty?
48:     end
49: 
50:     if remote? then
51:       abort "rubygems sucks and doesn't include the cert info..."
52:     end
53: 
54:     if specs.empty? then
55:       alert_error "Unknown gem '#{gem}'"
56:       terminate_interaction 1
57:     end
58: 
59:     spec = specs.last
60:     cert = spec.cert_chain.join
61: 
62:     unless cert.empty? then
63:       IO.popen("openssl x509 -noout -text", "w+") do |io|
64:         io.puts cert
65:         puts io.read
66:       end
67:     else
68:       alert_error "Gem '#{gem}' is not signed"
69:       terminate_interaction 1
70:     end
71:   end