mastodon/app/models/ip_block.rb

# frozen_string_literal: true
# == Schema Information
#
# Table name: ip_blocks
#
#  id         :bigint(8)        not null, primary key
#  created_at :datetime         not null
#  updated_at :datetime         not null
#  expires_at :datetime
#  ip         :inet             default(#<IPAddr: IPv4:0.0.0.0/255.255.255.255>), not null
#  severity   :integer          default(NULL), not null
#  comment    :text             default(""), not null
#

class IpBlock < ApplicationRecord
  CACHE_KEY = 'blocked_ips'

  include Expireable

  enum severity: {
    sign_up_requires_approval: 5000,
    sign_up_block: 5500,
    no_access: 9999,
  }

  validates :ip, :severity, presence: true

  after_commit :reset_cache

  def to_log_human_identifier
    "#{record.ip}/#{record.ip.prefix}"
  end

  class << self
    def blocked?(remote_ip)
      blocked_ips_map = Rails.cache.fetch(CACHE_KEY) { FastIpMap.new(IpBlock.where(severity: :no_access).pluck(:ip)) }
      blocked_ips_map.include?(remote_ip)
    end
  end

  private

  def reset_cache
    Rails.cache.delete(CACHE_KEY)
  end
end