Simple adapter class that talks with Cloudflare API to allow for cache purge. It uses faraday for requests.

cloudflare.rb

# frozen_string_literal: true

# Cloudflare adapter to help us communicate with the cloudflare API.
# Usage:
#   cloudflare = Cloudflare.new(zone: '123', api_key: '2323', email: '[email protected]')
#   cloudflare.purge_everything
#   cloudflare.zones

class Cloudflare
  CLOUDFLARE_API_ENDPOINT = 'https://api.cloudflare.com/client/v4'
  attr_reader :zone, :api_key, :email

  def initialize(zone:, api_key:, email:)
    @zone = zone
    @api_key = api_key
    @email = email
  end

  # Purge everything from the set zone. It makes a simple post request to the API with purge_everything as param.
  def purge_everything
    Rails.logger.info 'Purging cache on Cloudflare'.yellow
    data = {purge_everything: true}
    response = connection.post("zones/#{zone}/purge_cache", data)
    raise StandardError, "Unable to purge Cloudflare cache: #{response.body['errors']}" unless response.body['success']

    Rails.logger.info 'Purged cache on Cloudflare'.green
  end

  # Returns all the zones for this account.
  # @return [Hash]
  def zones
    connection.get('zones').body
  end

  private

  # Faraday connection that defines the headers and response content types
  def connection
    Faraday.new(url: CLOUDFLARE_API_ENDPOINT) do |conn|
      conn.headers['Content-Type'] = 'application/json'
      conn.headers['X-Auth-Key'] = api_key
      conn.headers['X-Auth-Email'] = email
      conn.request :json
      conn.response :json, content_type: /\bjson$/
      conn.adapter Faraday.default_adapter
    end
  end
end