#
# Copyright (C) 2013 Conjur Inc
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class Conjur::Command::Authn < Conjur::Command
  desc "Login and logout"
  command :authn do |authn|
    authn.desc "Logs in and caches credentials to netrc."
    authn.arg_name "login-name"
    authn.long_desc <<-DESC
Logins in a user. Login name can be provided as the command argument, as -u or --username, or the command will prompt
for the username. Password can be provided as -p, --password, or the command will prompt for the password.

On successful login, the password is exchanged for the API key, which is cached in the operating system user's
.netrc file. Subsequent "conjur" commands will authenticate with the cached login name and API key. To switch users, 
login again using the new user credentials. To erase credentials, use the 'authn logout' command.

If specified, the CAS server URL should be in the form https://<hostname>/v1.
It should be running the CAS RESTful services at the /v1 path
(or other path as specified by this argument).
    DESC
    authn.command :login do |c|
      c.arg_name 'username'
      c.flag [:u,:username]

      c.arg_name 'password'
      c.flag [:p,:password]

      c.arg_name 'CAS server'
      c.desc 'Specifies a CAS server URL to use for login'
      c.flag [:"cas-server"]

      c.action do |global_options,options,args|
        if options[:username].blank? && !args.empty?
          options[:username] = args.pop
        end
        
        Conjur::Authn.login(options.slice(:username, :password))
        
        puts "Logged in"
      end
    end

    authn.desc "Obtains an authentication token using the current logged-in user"
    authn.command :authenticate do |c|
      c.arg_name 'header'
      c.desc "Base64 encode the result and format as an HTTP Authorization header"
      c.switch [:H,:header]

      c.action do |global_options,options,args|
        token = Conjur::Authn.authenticate(options)
        if options[:header]
          puts "Authorization: Token token=\"#{Base64.strict_encode64(token.to_json)}\""
        else
          display token
        end
      end
    end

    authn.desc "Logs out"
    authn.command :logout do |c|
      c.action do
        Conjur::Authn.delete_credentials

        puts "Logged out"
      end
    end

    authn.desc "Prints out the current logged in username"
    authn.command :whoami do |c|
      c.action do
        begin
          creds = Conjur::Authn.get_credentials(noask: true)
          puts({account: Conjur::Core::API.conjur_account, username: creds[0]}.to_json)
        rescue Conjur::Authn::NoCredentialsError
          exit_now! 'Not logged in.', -1
        end
      end
    end
  end
end