Ruby integration for generating URLs for Bunny CDN.

bunny.rb

# frozen_string_literal: true

class Bunny::Url
  attr_reader :path, :expires_in, :options

  def initialize(path, options = {})
    @path = path.respond_to?(:key) ? path.key : path
    @expires_in = options.delete(:expires_in) || 1.week
    @options = options
  end

  def expires
    @expires ||= expires_in.from_now.to_i
  end

  def hashable_base
    "#{security_key}/#{path}#{expires}"
  end

  def token
    Digest::MD5.base64digest(hashable_base).tr("+/", "-_").tr("=", "").strip
  end

  def query
    options.merge(token: token, expires: expires).to_query
  end

  def hostname
    ENV.fetch("BUNNY_HOST") { credentials[:bunny_hostname] }
  end

  def security_key
    ENV.fetch("BUNNY_SECURITY_KEY") { credentials[:bunny_security_key] }
  end

  def to_s
    "https://#{hostname}/#{path}?#{query}"
  end

  def inspect
    "<#{self.class.name} expires=#{expires} token=#{token.inspect}>"
  end

  private
    def credentials
      Rails.application.credentials
    end
end