jbox-web/redmine_git_hosting

# frozen_string_literal: true

module RedmineGitHosting
  class MirrorKeysInstaller
    attr_reader :gitolite_home_dir, :gitolite_ssh_public_key, :gitolite_ssh_private_key

    GITOLITE_MIRRORING_KEYS_NAME = 'redmine_gitolite_admin_id_rsa_mirroring'

    def initialize(gitolite_home_dir, gitolite_ssh_public_key, gitolite_ssh_private_key)
      @gitolite_home_dir        = gitolite_home_dir
      @gitolite_ssh_public_key  = gitolite_ssh_public_key
      @gitolite_ssh_private_key = gitolite_ssh_private_key
    end

    class << self
      def mirroring_public_key(gitolite_ssh_public_key)
        format_mirror_key(File.read(gitolite_ssh_public_key))
      rescue StandardError => e
        RedmineGitHosting.logger.error "Error while loading mirroring public key : #{e.inspect}"
        nil
      end

      def format_mirror_key(key)
        key = key.chomp.strip
        key.split(/[\t ]+/)[0].to_s + ' ' + key.split(/[\t ]+/)[1].to_s
      end
    end

    def installed?
      installable? && install!
    end

    def installable?
      return false if gitolite_home_dir.nil?
      return false if gitolite_ssh_public_key_content.nil?
      return false if gitolite_ssh_private_key_content.nil?

      true
    end

    def install!
      logger.info 'Installing Redmine Gitolite mirroring SSH keys ...'
      installed = install_public_key && install_private_key && install_mirroring_script
      logger.info 'Done!'
      installed
    end

    def install_public_key
      install_file gitolite_ssh_public_key_content, gitolite_ssh_public_key_dest_path, '644' do
        logger.error "Failed to install Redmine Git Hosting mirroring SSH public key : #{e.output}"
      end
    end

    def install_private_key
      install_file gitolite_ssh_private_key_content, gitolite_ssh_private_key_dest_path, '600' do
        logger.error "Failed to install Redmine Git Hosting mirroring SSH private key : #{e.output}"
      end
    end

    def install_mirroring_script
      install_file mirroring_script_content, RedmineGitHosting::Config.gitolite_mirroring_script, '700' do
        logger.error "Failed to install Redmine Git Hosting mirroring script : #{e.output}"
      end
    end

    private

    def logger
      RedmineGitHosting.logger
    end

    def mirroring_script_content
      [
        '#!/bin/sh', "\n",
        'exec', 'ssh', '-T', '-o', 'BatchMode=yes', '-o', 'StrictHostKeyChecking=no', '-i', gitolite_ssh_private_key_dest_path, '"$@"',
        "\n"
      ].join(' ')
    end

    def gitolite_ssh_public_key_content
      File.read gitolite_ssh_public_key
    rescue StandardError
      nil
    end

    def gitolite_ssh_private_key_content
      File.read gitolite_ssh_private_key
    rescue StandardError
      nil
    end

    def gitolite_ssh_public_key_dest_path
      File.join gitolite_home_dir, '.ssh', "#{GITOLITE_MIRRORING_KEYS_NAME}.pub"
    end

    def gitolite_ssh_private_key_dest_path
      File.join gitolite_home_dir, '.ssh', GITOLITE_MIRRORING_KEYS_NAME
    end

    def install_file(source, destination, perms)
      RedmineGitHosting::Commands.sudo_install_file source, destination, perms
    rescue RedmineGitHosting::Error::GitoliteCommandException
      yield
      false
    end
  end
end