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path: root/app/models/backends/terraform_aws.rb
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# GOV.UK Mini Environment Admin
# Copyright © 2018  Christopher Baines <mail@cbaines.net>
#
# This file is part of the GOV.UK Mini Environment Admin.
#
# The GOV.UK Mini Environment Admin is free software: you can
# redistribute it and/or modify it under the terms of the GNU Affero
# General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later
# version.
#
# The GOV.UK Mini Environment Admin is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with the GOV.UK Mini Environment Admin.  If not, see
# <http://www.gnu.org/licenses/>.

# == Schema Information
#
# Table name: terraform_aws_backends
#
#  id                    :integer          not null, primary key
#  label                 :string
#  aws_region            :string
#  aws_access_key_id     :string
#  aws_secret_access_key :string
#  created_at            :datetime         not null
#  updated_at            :datetime         not null
#  domain                :string
#  route_53_zone_id      :string           not null
#  vpc_id                :string           not null
#

require 'ruby_terraform'

class Backends::TerraformAws < ApplicationRecord
  has_many :mini_environments, as: :backend

  self.table_name = 'terraform_aws_backends'

  def self.label
    'Amazon Web Services'
  end

  def type_and_id
    "#{self.class.name}=#{id}"
  end

  def build(mini_environment)
    slug = mini_environment.name.parameterize

    GovukGuix::BuildJob.enqueue(
      mini_environment.id,
      services: mini_environment.services.map(&:build_argument_string),
      arguments: {
        type: 'container-start-script',
        app_domain: "#{slug}.#{domain}",
        web_domain: "www.#{slug}.#{domain}",
        use_https: 'certbot',
        http_ports_mode: 'alternative',
        read_bundle_install_input_as_tar_archive: true,
        signon_instance_name: slug,
        admin_environment_label: mini_environment.name,
        use_error_pages: 'true',
        origin_basic_auth: "#{slug}=#{slug}",
        share: [
          '/var/cache/govuk-mini-environment-admin=/var/cache',
          '/var/lib/govuk-mini-environment-admin=/var/lib',
          '/var/log/govuk-mini-environment-admin=/var/log'
        ]
      },
      run_remotely_on_host: "ubuntu@guix-daemon.#{domain}"
    )
  end

  def create_data_snapshot
    GovukGuix::CreateDataSnapshotJob.enqueue(
      run_remotely_on_host: "ubuntu@guix-daemon.#{domain}",
      backend_type: self.class.name,
      backend_id: id
    )
  end

  def start(mini_environment)
    logger.info "Setting up #{mini_environment.name}"

    within_terraform_working_directory(mini_environment) do
      RubyTerraform.apply(
        vars: terraform_variables(mini_environment),
        auto_approve: true
      )
    end
  end

  def destroy(mini_environment)
    within_terraform_working_directory(mini_environment) do
      RubyTerraform.destroy(
        vars: terraform_variables(mini_environment),
        force: true
      )
    end
  end

  def backend_terraform_variables
    public_ip_address = ENV[
      'GOVUK_MINI_ENVIRONMENT_ADMIN_PUBLIC_IP_ADDRESS'
    ]

    raise 'missing public ip address' if public_ip_address.nil?

    common_terraform_variables.merge(
      aws_vpc_id: vpc_id,
      ssh_public_key: ssh_public_key,
      backend_slug: label.parameterize,
      mini_environment_admin_guix_public_key: guix_public_key,
      mini_environment_admin_public_ip_address: public_ip_address
    )
  end

  def deploy_backend
    TerraformWorkingDirectory.new(
      terraform_state_id,
      'terraform/aws/backend'
    ).within_working_directory do
      RubyTerraform.apply(
        vars: backend_terraform_variables,
        auto_approve: true
      )
    end
  end

  def destroy_backend
    TerraformWorkingDirectory.new(
      terraform_state_id,
      'terraform/aws/backend'
    ).within_working_directory do
      RubyTerraform.destroy(
        vars: backend_terraform_variables,
        force: true
      )
    end
  end

  def available_data_snapshots
    GovukGuix::DataSnapshot.where(backend: self)
  end

  def within_terraform_working_directory(mini_environment, &block)
    TerraformWorkingDirectory.new(
      "mini_environment/#{mini_environment.id}",
      'terraform/aws/mini_environment'
    ).within_working_directory(&block)
  end

  def signon_url(mini_environment)
    "https://signon.#{mini_environment.name.parameterize}.#{domain}"
  end

  def common_terraform_variables
    {
      aws_access_key: aws_access_key_id,
      aws_secret_key: aws_secret_access_key,
      aws_region: aws_region,
      ssh_public_key: ssh_public_key,
      aws_route_53_zone_id: route_53_zone_id
    }
  end

  def terraform_variables(mini_environment)
    common_terraform_variables.merge(
      slug: mini_environment.name.parameterize,
      start_command: mini_environment.backend_data['build_output'],
      backend_remote_state_address: (
        'http://localhost:3000' +
        Rails
          .application
          .routes
          .url_helpers
          .terraform_http_backend_path(terraform_state_id)
      )
    )
  end

  def terraform_state_id
    "backend/terraform_aws/#{id}"
  end

  def ssh_public_key
    File.open("#{ENV['HOME']}/.ssh/id_rsa.pub", &:readline)
  end

  def guix_public_key
    "(entry #{File.read("/etc/guix/signing-key.pub")} (tag (guix import)))"
  end
end