# frozen_string_literal: true

require_relative '../../puppet/application'
require_relative '../../puppet/daemon'
require_relative '../../puppet/util/pidlock'
require_relative '../../puppet/agent'
require_relative '../../puppet/configurer'
require_relative '../../puppet/ssl/oids'

class Puppet::Application::Agent < Puppet::Application
  run_mode :agent

  def app_defaults
    super.merge({
                  :catalog_terminus => :rest,
                  :catalog_cache_terminus => :json,
                  :node_terminus => :rest,
                  :facts_terminus => :facter,
                })
  end

  def preinit
    # Do an initial trap, so that cancels don't get a stack trace.
    Signal.trap(:INT) do
      $stderr.puts _("Cancelling startup")
      exit(0)
    end

    {
      :waitforcert => nil,
      :detailed_exitcodes => false,
      :verbose => false,
      :debug => false,
      :setdest => false,
      :enable => false,
      :disable => false,
      :fqdn => nil,
      :serve => [],
      :digest => 'SHA256',
      :graph => true,
      :fingerprint => false,
      :sourceaddress => nil,
      :start_time => Time.now,
    }.each do |opt, val|
      options[opt] = val
    end

    @argv = ARGV.dup
  end

  option("--disable [MESSAGE]") do |message|
    options[:disable] = true
    options[:disable_message] = message
  end

  option("--enable")
  option("--debug", "-d")
  option("--fqdn FQDN", "-f")
  option("--test", "-t")
  option("--verbose", "-v")

  option("--fingerprint")
  option("--digest DIGEST")

  option("--sourceaddress IP_ADDRESS")

  option("--detailed-exitcodes") do |_arg|
    options[:detailed_exitcodes] = true
  end

  option("--logdest DEST", "-l DEST") do |arg|
    handle_logdest_arg(arg)
  end

  option("--waitforcert WAITFORCERT", "-w") do |arg|
    options[:waitforcert] = arg.to_i
  end

  option("--job-id ID") do |arg|
    options[:job_id] = arg
  end

  def summary
    _("The puppet agent daemon")
  end

  def help
    <<~HELP

      puppet-agent(8) -- #{summary}
      ========

      SYNOPSIS
      --------
      Retrieves the client configuration from the Puppet master and applies it to
      the local host.

      This service may be run as a daemon, run periodically using cron (or something
      similar), or run interactively for testing purposes.


      USAGE
      -----
      puppet agent [--certname <NAME>] [-D|--daemonize|--no-daemonize]
        [-d|--debug] [--detailed-exitcodes] [--digest <DIGEST>] [--disable [MESSAGE]] [--enable]
        [--fingerprint] [-h|--help] [-l|--logdest syslog|eventlog|<ABS FILEPATH>|console]
        [--serverport <PORT>] [--noop] [-o|--onetime] [--sourceaddress <IP_ADDRESS>] [-t|--test]
        [-v|--verbose] [-V|--version] [-w|--waitforcert <SECONDS>]


      DESCRIPTION
      -----------
      This is the main puppet client. Its job is to retrieve the local
      machine's configuration from a remote server and apply it. In order to
      successfully communicate with the remote server, the client must have a
      certificate signed by a certificate authority that the server trusts;
      the recommended method for this, at the moment, is to run a certificate
      authority as part of the puppet server (which is the default). The
      client will connect and request a signed certificate, and will continue
      connecting until it receives one.

      Once the client has a signed certificate, it will retrieve its
      configuration and apply it.


      USAGE NOTES
      -----------
      'puppet agent' does its best to find a compromise between interactive
      use and daemon use. If you run it with no arguments and no configuration, it
      goes into the background, attempts to get a signed certificate, and retrieves
      and applies its configuration every 30 minutes.

      Some flags are meant specifically for interactive use --- in particular,
      'test', 'tags' and 'fingerprint' are useful.

      '--test' runs once in the foreground with verbose logging, then exits.
      It also exits if it can't get a valid catalog. `--test` includes the
      '--detailed-exitcodes' option by default and exits with one of the following
      exit codes:

      * 0: The run succeeded with no changes or failures; the system was already in
           the desired state.
      * 1: The run failed, or wasn't attempted due to another run already in progress.
      * 2: The run succeeded, and some resources were changed.
      * 4: The run succeeded, and some resources failed.
      * 6: The run succeeded, and included both changes and failures.

      '--tags' allows you to specify what portions of a configuration you want
      to apply. Puppet elements are tagged with all of the class or definition
      names that contain them, and you can use the 'tags' flag to specify one
      of these names, causing only configuration elements contained within
      that class or definition to be applied. This is very useful when you are
      testing new configurations --- for instance, if you are just starting to
      manage 'ntpd', you would put all of the new elements into an 'ntpd'
      class, and call puppet with '--tags ntpd', which would only apply that
      small portion of the configuration during your testing, rather than
      applying the whole thing.

      '--fingerprint' is a one-time flag. In this mode 'puppet agent' runs
      once and displays on the console (and in the log) the current certificate
      (or certificate request) fingerprint. Providing the '--digest' option
      allows you to use a different digest algorithm to generate the fingerprint.
      The main use is to verify that before signing a certificate request on
      the master, the certificate request the master received is the same as
      the one the client sent (to prevent against man-in-the-middle attacks
      when signing certificates).

      '--skip_tags' is a flag used to filter resources. If this is set, then
      only resources not tagged with the specified tags will be applied.
      Values must be comma-separated.


      OPTIONS
      -------

      Note that any Puppet setting that's valid in the configuration file is also a
      valid long argument. For example, 'server' is a valid setting, so you can
      specify '--server <servername>' as an argument. Boolean settings accept a '--no-'
      prefix to turn off a behavior, translating into '--setting' and '--no-setting'
      pairs, such as `--daemonize` and `--no-daemonize`.

      See the configuration file documentation at
      https://puppet.com/docs/puppet/latest/configuration.html for the
      full list of acceptable settings. A commented list of all settings can also be
      generated by running puppet agent with '--genconfig'.

      * --certname:
        Set the certname (unique ID) of the client. The master reads this
        unique identifying string, which is usually set to the node's
        fully-qualified domain name, to determine which configurations the
        node will receive. Use this option to debug setup problems or
        implement unusual node identification schemes.
        (This is a Puppet setting, and can go in puppet.conf.)

      * --daemonize:
        Send the process into the background. This is the default.
        (This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
        prefix for boolean settings on the command line.)

      * --no-daemonize:
        Do not send the process into the background.
        (This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
        prefix for boolean settings on the command line.)

      * --debug:
        Enable full debugging.

      * --detailed-exitcodes:
        Provide extra information about the run via exit codes; works only if '--test'
        or '--onetime' is also specified. If enabled, 'puppet agent' uses the
        following exit codes:

        0: The run succeeded with no changes or failures; the system was already in
        the desired state.

        1: The run failed, or wasn't attempted due to another run already in progress.

        2: The run succeeded, and some resources were changed.

        4: The run succeeded, and some resources failed.

        6: The run succeeded, and included both changes and failures.

      * --digest:
        Change the certificate fingerprinting digest algorithm. The default is
        SHA256. Valid values depends on the version of OpenSSL installed, but
        will likely contain MD5, MD2, SHA1 and SHA256.

      * --disable:
        Disable working on the local system. This puts a lock file in place,
        causing 'puppet agent' not to work on the system until the lock file
        is removed. This is useful if you are testing a configuration and do
        not want the central configuration to override the local state until
        everything is tested and committed.

        Disable can also take an optional message that will be reported by the
        'puppet agent' at the next disabled run.

        'puppet agent' uses the same lock file while it is running, so no more
        than one 'puppet agent' process is working at a time.

        'puppet agent' exits after executing this.

      * --enable:
        Enable working on the local system. This removes any lock file,
        causing 'puppet agent' to start managing the local system again
        However, it continues to use its normal scheduling, so it might
        not start for another half hour.

        'puppet agent' exits after executing this.

      *  --evaltrace:
        Logs each resource as it is being evaluated. This allows you to interactively
        see exactly what is being done. (This is a Puppet setting, and can go in
        puppet.conf. Note the special 'no-' prefix for boolean settings on the command line.)

      * --fingerprint:
        Display the current certificate or certificate signing request
        fingerprint and then exit. Use the '--digest' option to change the
        digest algorithm used.

      * --help:
        Print this help message

      * --job-id:
        Attach the specified job id to the catalog request and the report used for
        this agent run. This option only works when '--onetime' is used.  When using
        Puppet Enterprise this flag should not be used as the orchestrator sets the
        job-id for you and it must be unique.

      * --logdest:
        Where to send log messages. Choose between 'syslog' (the POSIX syslog
        service), 'eventlog' (the Windows Event Log), 'console', or the path to a log
        file. If debugging or verbosity is enabled, this defaults to 'console'.
        Otherwise, it defaults to 'syslog' on POSIX systems and 'eventlog' on Windows.
        Multiple destinations can be set using a comma separated list
        (eg: `/path/file1,console,/path/file2`)"

        A path ending with '.json' will receive structured output in JSON format. The
        log file will not have an ending ']' automatically written to it due to the
        appending nature of logging. It must be appended manually to make the content
        valid JSON.

        A path ending with '.jsonl' will receive structured output in JSON Lines
        format.

      * --masterport:
        The port on which to contact the Puppet Server.
        (This is a Puppet setting, and can go in puppet.conf.
        Deprecated in favor of the 'serverport' setting.)

      * --noop:
        Use 'noop' mode where the daemon runs in a no-op or dry-run mode. This
        is useful for seeing what changes Puppet would make without actually
        executing the changes.
        (This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
        prefix for boolean settings on the command line.)

      * --onetime:
        Run the configuration once. Runs a single (normally daemonized) Puppet
        run. Useful for interactively running puppet agent when used in
        conjunction with the --no-daemonize option.
        (This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
        prefix for boolean settings on the command line.)

      * --serverport:
        The port on which to contact the Puppet Server.
        (This is a Puppet setting, and can go in puppet.conf.)

      * --sourceaddress:
        Set the source IP address for transactions. This defaults to automatically selected.
        (This is a Puppet setting, and can go in puppet.conf.)

      * --test:
        Enable the most common options used for testing. These are 'onetime',
        'verbose', 'no-daemonize', 'no-usecacheonfailure', 'detailed-exitcodes',
        'no-splay', and 'show_diff'.

      * --trace
        Prints stack traces on some errors. (This is a Puppet setting, and can go in
        puppet.conf. Note the special 'no-' prefix for boolean settings on the command line.)

      * --verbose:
        Turn on verbose reporting.

      * --version:
        Print the puppet version number and exit.

      * --waitforcert:
        This option only matters for daemons that do not yet have certificates
        and it is enabled by default, with a value of 120 (seconds). This
        causes 'puppet agent' to connect to the server every 2 minutes and ask
        it to sign a certificate request. This is useful for the initial setup
        of a puppet client. You can turn off waiting for certificates by
        specifying a time of 0.
        (This is a Puppet setting, and can go in puppet.conf.)

      * --write_catalog_summary
        After compiling the catalog saves the resource list and classes list to the node
        in the state directory named classes.txt and resources.txt
        (This is a Puppet setting, and can go in puppet.conf.)

      EXAMPLE
      -------
          $ puppet agent --server puppet.domain.com


      DIAGNOSTICS
      -----------

      Puppet agent accepts the following signals:

      * SIGHUP:
        Restart the puppet agent daemon.
      * SIGINT and SIGTERM:
        Shut down the puppet agent daemon.
      * SIGUSR1:
        Immediately retrieve and apply configurations from the puppet master.
      * SIGUSR2:
        Close file descriptors for log files and reopen them. Used with logrotate.

      AUTHOR
      ------
      Luke Kanies


      COPYRIGHT
      ---------
      Copyright (c) 2011 Puppet Inc., LLC Licensed under the Apache 2.0 License

    HELP
  end

  def run_command
    if options[:fingerprint]
      fingerprint
    else
      # It'd be nice to daemonize later, but we have to daemonize before
      # waiting for certificates so that we don't block
      daemon = daemonize_process_when(Puppet[:daemonize])

      # Setup signal traps immediately after daemonization so we clean up the daemon
      daemon.set_signal_traps

      log_config if Puppet[:daemonize]

      # Each application is responsible for pushing loaders onto the context.
      # Use the current environment that has already been established, though
      # it may change later during the configurer run.
      env = Puppet.lookup(:current_environment)
      Puppet.override(current_environment: env,
                      loaders: Puppet::Pops::Loaders.new(env, true)) do
        if Puppet[:onetime]
          onetime(daemon)
        else
          main(daemon)
        end
      end
    end
  end

  def log_config
    # skip also config reading and parsing if debug is not enabled
    return unless Puppet::Util::Log.sendlevel?(:debug)

    Puppet.settings.stringify_settings(:agent, :all).each_pair do |k, v|
      next if k.include?("password") || v.to_s.empty?

      Puppet.debug("Using setting: #{k}=#{v}")
    end
  end

  # rubocop:disable Lint/RedundantStringCoercion
  def fingerprint
    Puppet::Util::Log.newdestination(:console)
    cert_provider = Puppet::X509::CertProvider.new
    client_cert = cert_provider.load_client_cert(Puppet[:certname])
    if client_cert
      puts Puppet::SSL::Digest.new(options[:digest].to_s, client_cert.to_der).to_s
    else
      csr = cert_provider.load_request(Puppet[:certname])
      if csr
        puts Puppet::SSL::Digest.new(options[:digest].to_s, csr.to_der).to_s
      else
        $stderr.puts _("Fingerprint asked but neither the certificate, nor the certificate request have been issued")
        exit(1)
      end
    end
  rescue => e
    Puppet.log_exception(e, _("Failed to generate fingerprint: %{message}") % { message: e.message })
    exit(1)
  end
  # rubocop:enable Lint/RedundantStringCoercion

  def onetime(daemon)
    begin
      exitstatus = daemon.agent.run({ :job_id => options[:job_id], :start_time => options[:start_time], :waitforcert => options[:waitforcert] })
    rescue => detail
      Puppet.log_exception(detail)
    end

    daemon.stop(:exit => false)

    if not exitstatus
      exit(1)
    elsif options[:detailed_exitcodes] then
      exit(exitstatus)
    else
      exit(0)
    end
  end

  def main(daemon)
    Puppet.notice _("Starting Puppet client version %{version}") % { version: Puppet.version }
    daemon.start
  end

  # Enable all of the most common test options.
  def setup_test
    Puppet.settings.handlearg("--no-usecacheonfailure")
    Puppet.settings.handlearg("--no-splay")
    Puppet.settings.handlearg("--show_diff")
    Puppet.settings.handlearg("--no-daemonize")
    options[:verbose] = true
    Puppet[:onetime] = true
    options[:detailed_exitcodes] = true
  end

  def setup
    raise ArgumentError, _("The puppet agent command does not take parameters") unless command_line.args.empty?

    setup_test if options[:test]

    setup_logs

    exit(Puppet.settings.print_configs ? 0 : 1) if Puppet.settings.print_configs?

    Puppet::SSL::Oids.register_puppet_oids

    if options[:fqdn]
      Puppet[:certname] = options[:fqdn]
    end

    Puppet.settings.use :main, :agent, :ssl

    Puppet::Transaction::Report.indirection.terminus_class = :rest
    # we want the last report to be persisted locally
    Puppet::Transaction::Report.indirection.cache_class = :yaml

    if Puppet[:catalog_cache_terminus]
      Puppet::Resource::Catalog.indirection.cache_class = Puppet[:catalog_cache_terminus]
    end

    # In fingerprint mode we don't need to set up the whole agent
    unless options[:fingerprint]
      setup_agent
    end
  end

  private

  def enable_disable_client(agent)
    if options[:enable]
      agent.enable
    elsif options[:disable]
      agent.disable(options[:disable_message] || 'reason not specified')
    end
    exit(0)
  end

  def setup_agent
    agent = Puppet::Agent.new(Puppet::Configurer, (not(Puppet[:onetime])))

    enable_disable_client(agent) if options[:enable] or options[:disable]

    @agent = agent
  end

  def daemonize_process_when(should_daemonize)
    daemon = Puppet::Daemon.new(@agent, Puppet::Util::Pidlock.new(Puppet[:pidfile]))
    daemon.argv = @argv

    daemon.daemonize if should_daemonize

    daemon
  end
end
