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# frozen_string_literal: true
require 'resolv'
class InstanceConfiguration
SSH_ALGORITHMS = %w(DSA ECDSA ED25519 RSA).freeze
SSH_ALGORITHMS_PATH = '/etc/ssh/'.freeze
CACHE_KEY = 'instance_configuration'.freeze
EXPIRATION_TIME = 24.hours
def settings
@configuration ||= Rails.cache.fetch(CACHE_KEY, expires_in: EXPIRATION_TIME) do
{ ssh_algorithms_hashes: ssh_algorithms_hashes,
host: host,
gitlab_pages: gitlab_pages,
gitlab_ci: gitlab_ci }.deep_symbolize_keys
end
end
private
def ssh_algorithms_hashes
SSH_ALGORITHMS.map { |algo| ssh_algorithm_hashes(algo) }.compact
end
def host
Settings.gitlab.host
end
def gitlab_pages
Settings.pages.to_h.merge(ip_address: resolv_dns(Settings.pages.host))
end
def resolv_dns(dns)
Resolv.getaddress(dns)
rescue Resolv::ResolvError
end
def gitlab_ci
Settings.gitlab_ci
.to_h
.merge(artifacts_max_size: { value: Settings.artifacts.max_size&.megabytes,
default: 100.megabytes })
end
def ssh_algorithm_file(algorithm)
File.join(SSH_ALGORITHMS_PATH, "ssh_host_#{algorithm.downcase}_key.pub")
end
def ssh_algorithm_hashes(algorithm)
content = ssh_algorithm_file_content(algorithm)
return unless content.present?
{ name: algorithm,
md5: ssh_algorithm_md5(content),
sha256: ssh_algorithm_sha256(content) }
end
def ssh_algorithm_file_content(algorithm)
file = ssh_algorithm_file(algorithm)
return unless File.exist?(file)
File.read(file)
end
def ssh_algorithm_md5(ssh_file_content)
OpenSSL::Digest::MD5.hexdigest(ssh_file_content).scan(/../).join(':')
end
def ssh_algorithm_sha256(ssh_file_content)
OpenSSL::Digest::SHA256.hexdigest(ssh_file_content)
end
end
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